• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PISTON ASSEMBLY, FLUID PRESSURE CYLINDER, METHOD FOR MANUFACTURING PISTON ASSEMBLY. A main piston body (13) in a piston assembly (10A) of a fluid pressure cylinder (11) has a first piston member (40) and a second piston member (42) composed of a member in plate shape. The first piston member (40) and a second piston member (42) are joined in the condition of overlap in the axial direction of a piston rod (15). The second piston member (42) is not provided with a through hole in the direction of plate thickness.
    公开号:BR112013031008B1
    申请号:R112013031008-1
    申请日:2012-05-22
    公开日:2021-01-26
    发明作者:Chiaki Fukui
    申请人:Smc Kabushiki Kaisha；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a piston assembly having a piston main body and a piston rod connected to the piston main body, a fluid pressure cylinder including the piston assembly, and a method for manufacturing the piston assembly. piston. BACKGROUND OF THE TECHNIQUE
    [0002] A known type of fluid pressure cylinder includes a cylinder, a piston arranged for displacement in the axial direction inside the cylinder, and a piston rod connected to the piston. The fluid pressure cylinder is constructed in such a way that the piston rod, which is connected to the piston, undergoes movement by displacing the piston by fluid pressure. As a method of joining the piston and the piston rod, generally, a method by means of the screw coupling or a method that involves compression is adopted. With the screw engagement method, a screw hole (female screw threads) that penetrates through the piston in the axial direction is provided, while male screw threads are provided at one end of the piston rod and the piston rod is attached directly to the piston by the screw hitch, or alternatively, a drilling hole is provided in the piston, and the piston and piston rod are joined by a nut or similar fixation to one end of the piston rod after one end being inserted into the piston drilling hole {see, for example, Figure 10 of Japanese Revealed Utility Model Publication No. 58-123957}. With the compression method, a through hole is provided that penetrates in the axial direction of the piston, and after the piston rod has been inserted into the through hole, a portion of the piston is plastically deformed in order to join the piston and the stem piston rings (see, for example, Figure 1 of Japanese Revealed Utility Model Publication No. 63004406).
    [0003] In the case of the aforementioned screw engagement method, it is difficult for a hermetically sealed state to be maintained by the threads, and therefore a sealing member such as a separate O-ring must be provided in the clamping portion, and a process is necessary to provide a groove for installing the sealing member. In addition, in the case of the screw coupling method, a certain length for the screw is necessary in order to give sufficient strength to withstand the force generated by the fluid pressure, and it is difficult to shorten the length of the device as a whole.
    [0004] With the compression method, in order to provide sealing between the piston and the piston rod, a sealing member must be arranged in the engaged portion, and a process is required to provide a groove for installing the sealing member. A certain level of sealing capacity can be given by the plastic deformation of the metal, however, in this case, there is a concern that sufficient sealing capacity cannot be achieved. SUMMARY OF THE INVENTION
    [0005] The present invention was made taking into account the aforementioned problems, and has an objective of providing a piston assembly, a fluid pressure cylinder, and a method for manufacturing the piston assembly, in which it is not necessary to dispose of a piston member. seal between the piston and the piston rod, and which allows the total length of the product to be shortened,
    [0006] To achieve the above objective, a piston assembly of the present invention comprises a main piston body, and a piston rod joined to the main piston body, in which the main piston body includes a first piston member and a second member piston rods that are made up of plate members, the first piston member and the second piston member are mutually joined in a condition that they overlap in an axial direction of the piston rod, a sealing installation groove that extends in a circumferential direction is formed between an outer peripheral edge of the first piston member and an outer peripheral edge of the second piston member, and at least one of the first piston member and the second piston member has a plate thickness over all of the themselves.
    [0007] With the piston assembly of the present invention, since the main piston body is constructed from the first piston member and the second piston member which are formed from plate-like members, the piston width (thickness in the direction axial) can be shortened, and the total length of the fluid pressure cylinder device in which the piston assembly is incorporated can be made shorter accordingly, while allowing the cost of the device to be reduced. Furthermore, since a through hole does not exist that penetrates in the axial direction through the main piston body, it is essentially unnecessary for a sealing member to be disposed between the main piston body and the piston rod, thus allowing elimination of the sealing member and a reduction in the number of parts. In addition, since a sealing member is unnecessary, provision of a sealing groove for installing it is also unnecessary, thus allowing the structure to be simplified. Furthermore, in contrast to a structure equipped with a sealing function transmitted by means of plastic deformation, such as, for example, by compression or the like, concerns about the reliability of the sealing function can fundamentally be avoided.
    [0008] In the piston assembly described above, a through hole can be arranged in the first piston member so as to penetrate in the direction of plate thickness, and a fitting portion that is engaged in the through hole can be formed to project over one end of the piston rod.
    [0009] According to the above structure, when the main piston body and the piston rod are welded, the fitting portion provided at one end of the piston rod is mounted in the through hole provided in the first piston member, where the positioning of the piston rod in relation to the main piston body can be carried out easily and accurately.
    [0010] In the piston assembly described above, the main piston body may include a third piston member constituted from a plate-like member, and in an outer circumferential portion of the main piston body, a support member or a magnet extending to the along the outer circumference of the main piston body can be arranged in a groove formed between the second piston member and the third piston member.
    [0011] According to the above structure, a piston assembly can be provided in which, even when equipped with the support member or the magnet, the total length of the piston can be made shorter by shortening the width of the main piston body.
    [0012] In the piston assembly described above, the piston rod can be joined as a first piston rod to one side of the main piston body by means of welding, and a second piston rod can be joined to the other side of the main piston body .
    [0013] Due to the above structure, even in the case of a double piston rod type, the total cylinder length can be made shorter by shortening the width of the main piston body, the device can be made smaller in scale as a whole , and the cost of the device can be reduced.
    [0014] In the piston assembly described above, the first piston member and the second piston member can be joined by welding, and the main piston body and piston rod can also be joined by welding.
    [0015] According to the above structure, the first piston member and the second piston member can be reliably joined without providing an orifice that penetrates in the thickness direction through the first piston member or the second piston member.
    [0016] In addition, a fluid pressure cylinder according to the present invention comprises the piston assembly as described above, together with a housing that accommodates the piston assembly therein movably in the axial direction.
    [0017] According to the fluid pressure cylinder described above, since the total length of the piston assembly can be shortened, the total length of the fluid pressure cylinder can be reduced as well.
    [0018] In addition, a method for manufacturing a piston assembly according to the present invention comprises a first step of superimposing a first piston member and a second piston member which are formed from plate-like members, and joining both members to obtain a main piston body, and a second step of joining a piston rod to the main piston body, in which a sealing installation groove extending in a circumferential direction is formed between an outer peripheral edge of the first piston member. piston and an outer peripheral edge of the second piston member, and at least one of the first piston member and the second piston member has a plate thickness over all of them.
    [0019] According to the manufacturing method described above, the piston width (thickness in the axial direction) can be reduced, and since a sealing member between the main piston body and the piston rod can be eliminated, the number of parts can be reduced, and the structure can be simplified by making a sealing groove unnecessary for installing the sealing member.
    [0020] In the first step, the first piston member and the second piston member can be joined by welding, and in the second step, the main piston body and the piston rod can be joined by welding.
    [0021] According to the above structure, the first piston member and the second piston member can be reliably joined without providing an orifice that penetrates in the thickness direction through the first piston member or the second piston member.
    [0022] According to the piston assembly, the fluid pressure cylinder, and the method for manufacturing a piston assembly according to the present invention, it is unnecessary for a sealing member to be disposed between the main piston body and the piston rod, and the total length of the cylinder device can be reduced, or, alternatively, if the piston assembly is incorporated in a cylinder device of the same length as a conventional cylinder device, an advantage is obtained by the fact that stroke of the cylinder device can be increased.
    [0023] The aforementioned objectives and other objectives, characteristics and advantages of the present invention will become more evident from the following descriptions of the preferred embodiments, when considered in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
    [0024] Figure 1 is a partially omitted vertical cross-sectional view taken along an axial direction of a fluid pressure cylinder equipped with a piston assembly according to a first embodiment of the present invention, Figure 2A is a perspective view of the piston assembly shown in Figure 1; Figure 2B is an exploded perspective view of the piston assembly shown in Figure 1; Figure 3A is a vertical cross-sectional view before welding a first piston member and a second piston member; Figure 3B is a vertical cross-sectional view after welding the first piston member and the second piston member; Figure 3C is a vertical cross-sectional view before welding a piston main body and a piston rod; Figure 3D is a vertical cross-sectional view after welding the main piston body and the piston rod; Figure 4A is a perspective view of a piston assembly according to a second embodiment of the present invention; Figure 4B is a view in. exploded perspective of the piston assembly shown in Figure 4A; Figure 5 is a vertical cross-sectional view of a condition in which a sealing member of the piston assembly shown in Figure 4A is installed; Figure 6A is a perspective view of a piston assembly according to a third embodiment of the present invention; Figure 6B is an exploded perspective view of the piston assembly shown in Figure 6A; Figure 7 is a vertical cross-sectional view of a condition in which a sealing member of the piston assembly shown in Figure 6A is installed; Figure 8A is a perspective view of a piston assembly according to a fourth embodiment of the present invention; Figure 8B is an exploded perspective view of the piston assembly shown in Figure 8A; Figure 9 is a vertical cross-sectional view of a condition in which a sealing member of the piston assembly shown in Figure 8A is installed; Figure 10A is a perspective view of a piston assembly according to a fifth embodiment of the present invention; Figure 10B is an exploded perspective view of the piston assembly shown in Figure 10A; Figure 11 is a vertical cross-sectional view of a condition in which a sealing member and a piston assembly wear ring shown in Figure 10A are installed; Figure 12A is a perspective view of a piston assembly according to a sixth embodiment of the present invention; Figure 12B is an exploded perspective view of the piston assembly shown in Figure 12A and Figure 13 is a vertical cross-sectional view of a condition in which a sealing member and a magnet of the piston assembly shown in Figure 12A are installed. DESCRIPTION OF THE MODALITIES
    [0025] In the following, descriptions will be made with reference to the accompanying drawings of preferred embodiments of a piston assembly, a fluid pressure cylinder, and a method for manufacturing the piston assembly according to the present invention. [First Mode]
    [0026] Figure 1 is a partially omitted vertical cross-sectional view taken along the axial direction of a fluid pressure cylinder 11 equipped with a piston assembly 10A according to a first embodiment of the present invention. The fluid pressure cylinder 11 comprises, as basic elements constituting it, a housing (main cylinder body) 12, a main piston body 13 movably arranged in the axial direction inside the housing 12, and a piston rod 15 connected to the main piston body 13. Under the action of a fluid pressure, the main piston body 13 is moved in the axial direction inside the housing 12, through which the piston rod 15, which is connected to the main body of the piston piston 13, is moved reciprocally.
    [0027] The housing 12 consists of a metallic material, such as an aluminum alloy or the like, which is equipped with a pair of doors 14, 16, and inside it is provided with a sliding hole (cylinder chamber ) 18 communicating with the doors 14, 16. Within the sliding orifice 18, the main piston body 13 is movable mutually in an axial direction within a certain restricted range.
    [0028] The main piston body 13 is accommodated within the housing 12. The main piston body 13 is a displaceable body that is displaceable in the axial direction (direction of the arrow X in Figure 1) of the sliding hole 18 in a state where the body main piston 13 divides the interior of housing 12 into a pressure chamber 20 on the side of one door 14 and a pressure chamber 22 on the side of the other door 16. In an outer circumference of the main piston body 13, an installation groove sealing ring 17 is formed to extend along the outer circumference of the main piston body 13. A sealing member (piston package) 19 made of an elastic material (for example, a rubber material) is mounted in the installation groove of seal 17.
    [0029] The sealing member 19 projects outwardly from a more outer circumferential portion of the main piston body 13 so as to extend peripherally around the main piston body 13. The sealing member, for example, is a ring-shaped The made of an elastic material, such as synthetic rubber or similar. The sealing member 19 provides a seal between the inner circumferential surface of the sliding hole 18 and the outer circumferential surface of the main piston body 13, and the interior of the housing 12 is divided into two pressure chambers 20, 22 in a watertight manner air (or fluid tight).
    [0030] A proximal end (one end in the direction of arrow X2) of the piston rod 15 is connected to the main piston body 13, and a distal end (one end in the direction of the arrow X1) of the piston rod 15 penetrates through a cover of rod 30 which closes one end of the sliding orifice 18, and extends outwardly to the sliding orifice 18. In the present embodiment, the piston assembly 10A is constituted from the main piston body 13 and the piston rod 15 .
    [0031] A sealing member 34, which is made from an elastic material and provides a seal between the inner circumferential surface of the stem cover 30 and an outer circumferential surface of the piston rod 15, is installed in an annular groove 32 formed in the circumferential part cover stem 30. A sealing member 38, which is made from an elastic material and provides a seal between the outer circumferential surface of the stem cover 30 and an inner circumferential surface of the sliding hole 18, is installed in a annular groove 36 formed in a more outer circumferential part of the cover rod 30.
    [0032] With the fluid pressure cylinder 11 constructed in the previous manner, from the two above-mentioned ports 14, 16, a pressure fluid such as pressurized air or the like is supplied to and discharged from the two pressure chambers 20, 22, by that the main piston body 13 is moved reciprocally in the axial direction of the sliding orifice 18, and the piston rod 15 undergoes forward and reverse movements.
    [0033] Figure 2A is a perspective view of the piston assembly 10A shown in Figure 1. Figure 2B is a perspective view of the constituent components prior to assembly (before joining) of the piston assembly 10A shown in Figure 1. The above main piston body 13 is constituted from a first piston member 40 and a second piston member 42. More specifically, the piston assembly 10A is constituted from the first piston member 40, the second piston member piston 42, and piston rod 15.
    [0034] Each of the first piston member 40 and the second piston member 42 has an oval plate member (substantially elliptical) in its entirety, which is formed by plastic deformation (e.g., pressure work) of a metal plate, and the first piston member 40 and second piston member 42 are joined together by welding. As will be described later, with the present embodiment, the first piston member 40 and the second piston member 42 are joined by means of projection welding.
    [0035] The first piston member 40 includes a flat oval base member 46, a side circumferential wall portion 48 that extends outwardly in the axial direction from the entire rim circumference of the base member 46, and a flange 50 that spreads to out along the entire circumference from one end (one end of a distal end side of the piston rod 15) of the side circumferential wall portion 48. A circular through hole 47 is formed in the center of the base member 46 in the direction of plate thickness of the same.
    [0036] The second piston member 42 is a flat oval plate in its entirety, and as shown in Figure 2B. before welding the first piston member 40 and the second piston member 42, a plurality of (four as exemplified in the drawing) welding projections (first welding projections 44) are arranged on a surface of the second piston member 42 which must be joined with the first piston member 40. The second piston member 42 has a predetermined plate thickness in its entirety, and has no orifice that penetrates in the direction of the plate thickness thereof.
    [0037] The shape and size of the flange profile 50 of the first piston member 40, and the shape and size of the profile of the second piston member 42 are substantially the same. The sealing installation groove 17 extends circumferentially between the outer peripheral edge of the second piston member 42 and the outer peripheral edge of the first piston member 40. More specifically, the sealing installation groove 57 extends in an oval shape, which is the same as that of the main piston body 13 (the first piston member 40 and the second piston member 42).
    [0038] The piston rod 15 of the illustrated example includes a cylindrical body portion 54. At a proximal end of the body portion 54, a circular socket portion 56 is formed, which projects concentric with the body portion 54 (see Figures 3C and 3D). The fitting portion 56 has an outer diameter, which is smaller than that of the body portion 54 of the piston rod 15. The outer diameter of the same is the same as, or slightly smaller than, the inner diameter of the orifice. passage 47 provided in the first piston member 40. A stepped portion is formed in a circular shape due to the different outside diameters of the body portion 54 and the locking portion 56.
    [0039] The piston rod 15, before the welding of the piston rod 15 and the main piston body 13, further includes a welding projection (second welding projection) 58, which is formed to project towards the proximal end from a location in the vicinity of the peripheral edge portion of the socket portion 56, The weld projection 58 in the illustrated example is formed in the form of a circular ring. However, the weld projection 58 can also be constituted as a plurality of point-type projections or as a plurality of linear projections.
    [0040] The constituent materials of the first piston member 40, the second piston member 42, and the piston rod 15 are not particularly limited, as they are materials (metals) capable of being welded, and are capable of ensuring strength needed. Suitable materials that can be used include, for example, iron and steel, stainless steel, aluminum, aluminum alloys, etc.
    [0041] Next, a manufacturing method (mounting method) for piston assembly 10A will be described. First, the first piston member 40, the second piston member 42, and the piston rod 15, which are formed in the shapes shown in Figure 2B, are prepared. In addition, the first piston member 40 and the second piston member 42 are joined together by projection welding. In this case, more specifically, as shown in Figure 3A, in a condition where the first piston member 40 and the second piston member 42 are overlapped concentrically and pressure is applied to them, both members are electrically energized. When energized, the welding projections 44 provided on the second piston member 42 are melted by means of resistance heating, and as shown in Figure 3B, the first piston member 40 and the second piston member 42 are joined together. In this way, the main piston body 13 made from the first piston member 40 and the second piston member 42 is manufactured.
    [0042] In this case, alternatively, the first piston member 40 and the second piston member 42 can be joined integrally by an adhesive, without providing welding projections 44 on the second piston member 42.
    [0043] Then, the main piston body 13 and the piston rod 25 are joined together by means of projection welding. Specifically, first, as shown in Figure 3C, the piston rod 15 is placed forward in relation to the main piston body 13. More specifically, the engaging portion 56 provided at the proximal end of the piston rod 15 is mounted in the through hole 47 disposed in the first piston member 40. Therefore, the positioning of the piston rod 15 with respect to the main piston body 13 can be carried out easily and accurately. In addition, at this time, the weld projection 58 provided on the piston rod 15 abuts against the second piston member 42.
    [0044] In addition, in a condition where pressure is applied to the piston rod 15 and the main piston body 13 in the axial direction, both members are electrically energized. When energized, the weld projection 58 provided on the piston rod 15 is fused through resistance heating, and as shown in Figure 3D, the main piston body 13 (second piston member 42) and the piston rod 15 are joined together. Therefore, the piston assembly 10A which is constituted from the first piston member 40, the second piston member 42, and the piston rod 15, is obtained. The sealing member 19 is mounted on its outer periphery (in the sealing installation groove 17) of the main piston body 13 of the piston assembly 10A, which is manufactured in the previous form, and as shown in Figure 1, the piston assembly 10A is slidably arranged inside the housing 12, so that it can be mounted like the fluid pressure cylinder 11.
    [0045] In this case, alternatively, the piston rod 15 and the main piston body 13 can be joined integrally by an adhesive, without providing the welding projection 58 on the piston rod 15.
    [0046] The fluid pressure cylinder 11 equipped with the piston assembly 10A according to the present embodiment is constructed basically as described above. Then, its operations and advantages will be explained.
    [0047] With the piston assembly 10A, since the main piston body 13 is constructed from the first piston member 40 and the second piston member 42, which are made from plate-like members, compared to a main body of piston having a considerable thickness, which is obtained by a forging process or cutting and machining process as in conventional technique, the width of the main piston body 13 (thickness in the axial direction) can be shortened, and the total length of the cylinder fluid pressure 11 in which the piston assembly 10A is incorporated can be made shorter accordingly, allowing the cost of the fluid pressure cylinder 11 to be reduced. Alternatively, even if the fluid pressure cylinder 11 is the same length as the conventional device, by reducing the width (length in axial direction) of the piston main body 13, the stroke of the main piston body 13 can be lengthened . More specifically, without increasing the size and scale of the fluid pressure cylinder 11, an advantage is achieved in that the cerebral course can be increased in length.
    [0048] Although through hole 47 is arranged in the first piston member 40, a hole that penetrates in the direction of plate thickness is not provided in the second piston member 42. Thus, a hole does not exist that penetrates axially through the main piston body 13 as a whole. Thus, because there is no hole that penetrates axially through the main piston body 13, it is essentially unnecessary for a sealing member to be disposed between the main piston body 13 and the piston rod 15, thus allowing the elimination of such sealing member and a proportional reduction in the number of parts. In addition, since such a sealing member is unnecessary, the provision of a sealing groove for its installation is also unnecessary, thus allowing the structure to be simplified. In addition, in contrast to a structure equipped with a sealing function transmitted by means of plastic deformation, such as, for example, by compression or the like, concerns about the reliability of the sealing function can fundamentally be avoided.
    [0049] With the piston assembly 10A according to the present embodiment, the through hole 47 in the direction of plate thickness is provided in the first piston member 40, and the fitting portion 56 which is fitted into the baking hole 47 is formed to projecting over the end of the piston rod 15. Therefore, when the main piston body 13 and the piston rod 15 are welded, the locking portion 56 provided at one end of the piston rod 15 is engaged in the through hole 47 provided in the first piston member 40, whereby the positioning of the piston rod 15 with respect to the main piston body 13 can be carried out easily and accurately. [Second Mode]
    [0050] In the following, with reference to Figures 4A to 5, a piston assembly 103 according to a second embodiment will be described. In the piston set 10B according to the second modality, elements of the same, which give the same functions and effects as those of the piston set 10A according to the first modality, are designated by the same reference characters and their details are omitted . The piston assembly 10B according to the second embodiment is equipped with a main piston body 60, the structure of which differs from that of the main piston body 13 shown in Figure 1, etc. The main piston body 60 is formed from a first piston member 62 and a second piston member 64. Each of the first piston member 62 and the second piston member 64 is a full oval plate member, which is formed by plastic deformation (e.g., pressure work) of a metal plate, and the first piston member 62 and the second piston member 64 are joined together by welding. As will be described later, with the present embodiment, the first piston member 62 and the second piston member 64 are joined by means of projection welding.
    [0051] The first piston member 62 is substantially flat and oval in its entirety. As shown in Figure 4B, a circular through hole 66 is formed that penetrates in the direction of plate thickness in the center of the first piston member 62. The inside diameter of through hole 66 is the same or slightly larger than the outside diameter. of the engaging portion 56 of the piston rod 15.
    [0052] The second piston member 64 includes a flat oval base member 68, a side circumferential wall portion 70 that extends outwardly in the axial direction from the entire rim circumference of the base member 68, and a flange 72 that extends outwardly. out over the entire circumference from one end (one end of the side away from the piston rod 15) of the side circumferential wall portion 70. Before welding the first piston member 62 and the second piston member 64, a plurality of (four as exemplified in the drawing) weld projections 74 are arranged on a surface of the second piston member 64 which is to be joined with the first piston member 62. The second piston member 64 has a predetermined plate thickness in its entirety , and has no hole that penetrates in the direction of the plate's thickness.
    [0053] The shape and size of the profile of the first piston member 62 are substantially the same as the shape and size of the profile of the flange 72 of the second piston member 64. A sealing installation groove 65 extends circumferentially between the outer peripheral edge of the first member piston 62 and the outer peripheral edge of the second piston member 64. More specifically, the sealing installation groove 65 extends in an oval shape, which is the same as that of the main piston body 60 (the first piston member 62 and the second piston member 64}.
    [0054] For the manufacture of a piston assembly 10B, in the same manner as the aforementioned piston assembly 10A according to the first embodiment, initially, the first piston member 62 and the second piston member 64 are joined by means of welding of projection, and then the main piston body 60 and the piston rod 15 are joined by means of projection welding. In this way, as shown in Figure 4A and Figure 5, piston assembly 103, which is constituted from the first piston member 62, the second piston member 64, and the piston rod 25, is obtained.
    [0055] In this case, the first piston member 62 and the second piston member 64 can be joined integrally by an adhesive, without providing the welding projections 74 on the second piston member 64. In addition, the piston rod 15 and the main body piston 60 can be joined integrally by an adhesive, without providing the welding projection 58 on the piston rod 15.
    [0056] A sealing member 19 is mounted on an outer circumferential portion (sealing installation groove 65) of the main piston body 60 of the piston assembly 103, which is manufactured in the previous form, and the piston assembly 10B is arranged sliding inside the housing 12 (see Figure 1) to be mounted like the fluid pressure cylinder 11.
    [0057] In the second modality, relatively the respective constituent elements of the same that are common with the first modality, it is evidently that the operations and effects obtained are the same or similar for the operations and effects possessed by the respective common constituent elements in the first modality . [Third Mode]
    [0058] In the following, with reference to Figures 6A to 7, a piston assembly 1QC according to a third embodiment will be described. In the piston set 10C according to the third modality, the elements of the same, which give the same functions and effects as those of the piston set 10A according to the first modality, are designated by the same reference characters and their details are omitted.
    [0059] The piston assembly 10C according to the third embodiment includes a piston main body 80, and a piston rod 81 connected to the piston main body 80. The piston rod 81 is constructed with the fitting portion 56 being omitted from the rod piston 15 shown in Figure 1, etc. A weld projection 58, which is the same as the weld projection 58 shown in Figure 3C, is provided on a proximal end surface of piston rod 81.
    [0060] The main piston body 80 is constituted from a first piston member 82 and the second piston member 42. The first piston member 82 is constructed with the through hole 47 being omitted from the first piston member 40 shown in Figure 23, etc. More specifically, with the third embodiment, a through hole that penetrates in the direction of plate thickness is not provided in the first piston member 82, and the first piston member 82 is constituted from a flat plate with a plate thickness. predetermined over the whole of it. The second piston member 42 has the same structure as the second piston member 42 shown in Figures 2A and 2B.
    [0061] For manufacturing the piston assembly 10C, in the same way as the aforementioned piston assembly 10A according to the first embodiment, initially, the first piston member 82 and the second piston member 42 are joined by means of projection welding. Thereafter, the main piston body 80 and piston rod 81 are joined by means of projection welding. In this case, with the present embodiment, the proximal end of the piston rod 81 is made to abut against a center portion of the first piston member 82, and in a condition where pressure is applied in the axial direction to the piston rod 81 and the main piston body 80, both members are electrically energized. Consequently, resistance heating accompanying them, by melting the weld projection 58 arranged on the piston rod 81, as shown in Figure 7, the main piston body 80 (first piston member 82) and the piston rod 81 are joined together. In this way, the piston assembly 10C, which is constituted from the first piston member 82, the second piston member 42, and the piston rod 81, is obtained.
    [0062] In this case, the first piston member 82 and the second piston member 42 can be joined integrally by an adhesive, without providing the welding projections 44 on the second piston member 42. In addition, the piston rod 81 and the main body piston 80 can be joined integrally by an adhesive, without providing the weld projection 58 on the piston shaft 81.
    [0063] A sealing member 19 is mounted on an outer circumferential portion (sealing installation groove 17) of the main piston body 80 of the piston assembly 10C, which is manufactured in the previous form, and the piston assembly 10C is slidably arranged inside the housing 12 (see Figure 1) to thereby be mounted as the fluid pressure cylinder 11.
    [0064] In the third modality, relatively the respective constituent elements of the same that are common with the first modality, it is evidently that the operations and effects obtained are the same or similar for the operations and effects possessed by the respective common constituent elements in the first modality . [Fourth Mode]
    [0065] In a piston assembly 10D according to a fourth embodiment shown in Figures 8A to 9, a main piston body 88, which is constituted from a first piston member 84 and a second piston member 86 can be constituted with a circular shape. In addition to being globally circular, the main piston body 88 (the first piston member 84 and the second piston member 86) has the same structure as the main piston body 13 {the first piston member 40 and second piston member 42) shown in Figure 23, etc.
    [0066] More specifically, the first piston member 84 includes a flat circular shaped base member 90, a cylindrical lateral circumferential wall portion 92 that extends outwardly in the axial direction from the entire rim circumference of the base member 90, and a flange 94 that spreads out radially along the entire circumference of one end (one end of the distal end side of the piston rod 15) of the side circumferential wall portion 92. A circular through hole 47 is formed in the center of the base member 90 and penetrates in the direction of plate thickness thereof.
    [0067] The second piston member 86 is circular in shape and substantially in the form of a flat plate in its entirety, and as shown in Figure 8B, prior to welding the first piston member 84 and the second piston member 86, a plurality of (four as exemplified in the drawing) weld projections (first weld projections 44) are arranged on a surface of the second piston member 86 which must be joined with the first piston member 84. The second piston member 86 has a plate thickness predetermined in its entirety, and has no orifice that penetrates in the direction of plate thickness. The outside diameters of the first piston member 84 and the second piston member 86 are substantially the same mutually.
    [0068] A circumferentially extending annular seal installation groove 96 is formed by the flange 94 and the lateral circumferential wall portion 92 of the first piston member 84, and the outer peripheral edge of the second piston member 86.
    [0069] The piston assembly 10D can be assembled using the same procedure as that used to assemble the piston assembly 10A according to the first modality. As shown in Figure 9, a ring-shaped sealing member 98, which is made of an elastic material (for example, a rubber material), is mounted on the outermost circumferential portion (sealing installation groove 96) of the body main piston 88 of the 10D piston assembly. The piston assembly 10D with the sealing member 98 mounted thereon is slidably disposed within a housing having a sliding hole with a circular shape in cross section, to thereby be mounted as a fluid pressure cylinder.
    [0070] According to the piston assembly 10D according to the fourth modality, the same advantages and effects are obtained as those of the piston assembly 10A according to the first modality. [Fifth Mode]
    [0071] In the following, with reference to Figures 10A to 11, a piston assembly 10E according to a fifth embodiment will be described. In the piston set 10E according to the fifth modality, the constituent elements of the same, which are the same as those of the piston sets 10A, 10D according to the first and fourth modalities, are indicated by the same reference characters and their details are omitted.
    [0072] The piston assembly 10E according to the fifth embodiment differs from the piston assembly ÍOD according to the fourth embodiment in relation to the construction of a main piston body 100. The main piston body 100 is constituted from a first member of piston 84, a second piston member 86, and a third piston member 106. The first piston member 84 and the second piston member 86, respectively, are constructed in the same way as the first piston member 84 and the second member piston 86 shown in Figures 8A and 83.
    [0073] The third piston member 106 includes a circular ring-shaped base element 108 with a circular opening 107 disposed therein, a side circumferential wall portion 110 that extends outwardly in the axial direction from the entire circumference of the rim of the member base 108, and a flange 112 extending outwardly in a radial direction along the entire circumference of one end (one end on the opposite side of piston rod 15 with the second piston member 86 acting as a reference) of the lateral circumferential wall portion 110.
    [0074] Although, as shown in the illustrated example, circular opening 107 is provided in base member 108 of third piston member 106, circular opening 107 can be omitted. More specifically, the third piston member 106 can be formed without an orifice that penetrates in the direction of plate thickness. As shown in Figure 10B, the third piston member 106, before welding the second piston member 86 and the third piston member 106, includes a plurality of (four as exemplified in the drawing) welding projections 114 arranged on its surface that it must be joined with the second piston member 86. As shown in the drawing, the welding projections 114 are arranged circumferentially at equal intervals on the third piston member 106.
    [0075] The shape and size of the flange profile 112 of the third piston member 106, and the shape and size of the profile of the second piston member 86 are substantially the same. As shown in Figure 10A, by means of the outer peripheral edge of the second piston member 86, and the side circumferential wall portion 110 and the flange 112 of the third piston member 106, a groove 116 is formed that extends over an interval circumferentially 360 °.
    [0076] For the manufacture of the piston assembly 10E, in the same manner as the piston assembly 10A mentioned above according to the first embodiment. Initially, the first piston member 84 and the second piston member 86 are joined by means of projection welding. Thereafter, the second piston member 86 (the second piston member 86 with the first piston member 84 attached to it) 'and the third piston member 106 are connected by means of projection welding. In this case, more specifically, in a state where the second piston member 86 and the third piston member 106 are superimposed concentrically and pressure is applied to them, both members are electrically energized. When energized, the welding projections 114 provided on the third piston member 106 are melted by resistance heating, after which the second piston member 86 and the third piston member 106 are mutually joined. In this way, the main piston body 100, which is constituted from the first piston member 84, the second piston member 86, and the third piston member 106, is manufactured. Alternatively, the first piston member 84 and the second piston member 86 can be joined together, after the second piston member 86 and the third piston member 106 have been joined.
    [0077] Then, the main piston body 100 and the piston rod 15 are joined together by means of projection welding. Welding, in this case, can be carried out according to the welding technique used for the main piston body 13 and the piston rod 15 in the first modality. As a result, the piston assembly 10E, which is constituted from the first piston member 84, the second piston member 86, the third piston member 106, and the piston rod 15, is obtained.
    [0078] In this case, the first piston member 84 and the second piston member 86 can be joined integrally by an adhesive, without providing the welding projections 44 on the second piston member 86. In addition, the second piston member 86 and the third piston member 106 can be joined integrally by an adhesive, without providing the welding projections 114 on the third piston member 106. The piston rod 15 and the main piston body 200 can be joined integrally by an adhesive, without providing the projection welding rod 58 on the piston rod 15.
    [0079] As shown in Figure 11, a ring-shaped sealing member 98, which is made of an elastic material (for example, a rubber material), is mounted on the outermost circumferential portion (sealing installation groove 96) of the body main piston 100 of the manufactured piston assembly 10E, and a wear ring in the form of a ring or a C (support member) 118, which is made of a low friction material, is arranged in the groove 116. As materials suitable low-friction materials, for example, synthetic resin materials equipped with both wear resistance and low friction, such as tetrafluoroethylene (PTFE), or metallic or similar materials, can be cited in a condition where the wear ring 118 is installed in the groove 116, the outer diameter of the wear ring 118 is greater than the outer diameter of the second piston member 86 and the third piston member 106.
    [0080] The piston assembly 10E with the sealing member 98 and the wear ring 118 mounted thereon is slidably arranged inside a housing having a sliding hole with a circular shape in cross section, to thereby be mounted as a fluid pressure cylinder. Since the wear ring 118 is made from a low-friction material, the friction coefficient developed between the inner circumferential surface of the sliding hole and the wear ring 118 is less than the friction coefficient between the surface inner circumferential of the sliding hole and the sealing member 98.
    [0081] During the operation of the fluid pressure cylinder equipped with the piston assembly 10E, in the case of a large lateral load, which acts in a direction perpendicular to the axial direction, it is applied to the main piston body 100, the outer circumferential surface of the wear ring 118, which projects outwards beyond the outermost circumferential portion of the main body piston 100, is placed in contact with the sliding hole, whereby the outer circumference of the main piston body 100 is prevented from contacting the inner circumferential surface of the sliding hole.
    [0082] In the case of the piston assembly 10E according to the present embodiment, since the third piston member 106 that constitutes the groove 116 for installation of the wear ring 118 is made from a plate-like member, an increase in the axial width of it is suppressed, while the main piston body 100 can be constructed having the groove 116 to allow installation of the wear ring 118. Thus, by arrangement of the wear ring 118, together with reducing the width of the main piston body 100, the piston assembly 10E can be offered in which the total length of the piston is reduced.
    [0083] In addition, the same advantages and effects as those of the piston assembly 10A according to the first embodiment are obtained in accordance with the piston assembly 10E according to the fifth embodiment.
    [0084] As modifications of the piston assembly 10E, the main piston body 100 can be constituted in an oval shape in the same way as the main piston body 13 of the first embodiment, or alternatively, in the form of an ellipse.
    [0085] With the piston assembly 10E, the sealing member 98 is disposed between the first piston member 84 and the second piston member 86, and the wear ring 118 is disposed between the second piston member 86 and the third piston member 106. However, the sealing member 98 and the wear ring 118 can be arranged at opposite locations. More specifically, the wear ring 118 can be arranged between the first piston member 84 and the second piston member 86, and the sealing member 98 can be placed between the second piston member 86 and the third piston member 106. [Sixth Mode]
    [0086] In the following, with reference to Figures 12A to 13, a piston assembly 10F according to a sixth embodiment will be described. In the piston set 10F according to the sixth modality, the constituent elements of the same, which are the same as those of the piston sets 10A, 10D according to the first and fourth modalities, are indicated by the same reference characters and their details are omitted.
    [0087] The piston assembly 10F according to the sixth modality, in relation to the piston assembly 10D according to the fourth modality, is further equipped with a third piston member 122 and a second piston rod 124. More specifically, with the present In this embodiment, a main piston body 120 consists of the first piston member 84, the second piston member 86, and the third piston member 122, together with the piston rod 15 and the second piston rod 124, which is arranged on an opposite side, being arranged to sandwich the main piston body 120 between them. Below, in this modality, the term "first piston rod 15" will be used to refer to piston rod 15.
    [0088] The third piston member 122 includes a circular base member 126, a cylindrical circumferential side wall portion 128 that extends outwardly in the axial direction from the entire rim circumference of the base member 126, and a flange 130 that spreads to the outside in a radial direction along the entire circumference of one end (an end on an opposite side from the piston rod with the second piston member 86 acting as a reference) of the side circumferential wall portion 128. An orifice circular passageway 131 is formed to penetrate in the direction of plate thickness in the center of the base member 126.
    [0089] As shown in Figure 12B, on the third piston member 122, before being joined to the second piston member 86 by means of welding, a plurality of (four as exemplified in the drawing) welding projections 129 are arranged on its surface which must be joined with the second piston member 86. In the illustrated third piston member 122, the welding projections 129 are arranged circumferentially at equal intervals. The through hole 131 of the third piston member 122 has the same diameter as the through hole 47 of the first piston member 84.
    [0090] The shape and size of the flange profile 130 of the third piston member 122, and the shape and size of the profile of the second piston member 86 are the same or substantially the same. As shown in Figure 12A. by means of the outer peripheral edge of the second piston member 86, and the side circumferential wall portion 128 and the flange 130 of the third piston member 122, a groove 132 is formed that extends circumferentially over a 360 ° gap.
    [0091] In the present embodiment, the first piston member 84, the second piston member 86, and the third piston member 122 are made from non-magnetic metals. Suitable non-magnetic metals include aluminum alloys, copper alloys, zinc alloys, stainless steel, etc.
    [0092] The second piston rod 124 is constructed as with the case with the first piston rod 15. More specifically, the second piston rod 124 includes a body portion 134, and a socket portion 136, which is arranged at a proximal end. body portion 134. A weld projection 138 is provided on the second piston rod 124 prior to welding it with the piston main body 120. The body portion 134, the socket portion 136, and the welding projection 138 they are similar in construction, respectively, to the body portion 54, the socket portion 56, and the weld projection 58 on the first piston rod 15 (see Figure 3C}.
    [0093] For manufacturing the 10F piston assembly. in the same way as the aforementioned piston assembly 10A according to the first embodiment, initially, the first piston member 84 and the second piston member 86 are joined by means of projection welding. Subsequently, the second piston member 86 (the second piston member 86 with the first piston member 84 attached to it} and the third piston member 122 are connected by means of projection welding. In this case, more specifically, in a state in which the second piston member 86 and the third piston member 122 are superimposed concentrically and pressure is applied to them, both members are electrically energized.
    [0094] When energized, the welding projections 129 provided on the third piston member 122 are melted by resistance heating, after which the second piston member 86 and the third piston member 122 are mutually joined. In this way, the main piston body 120, which is constituted from the first piston member 84, the second piston member 86, and the third piston member 122, is manufactured. Alternatively, the first piston member 84 and the second piston member 86 can be joined together after the second piston member 86 and the third piston member 122 have been joined.
    [0095] Then, the main piston body 120 and the first piston rod 15 are joined together by means of projection welding, and the main piston body 120 and the second rod 124 are joined together by means of projection welding. Welding of the main piston body 120 and the first piston rod 15 can be carried out according to the welding technique used for the main piston body 13 and the piston rod 15 in the first embodiment.
    [0096] To join the main piston body 120 and the second piston rod 124, first, a proximal end of the second piston rod 124 is made to abut against the main piston body 120. More specifically, the plug portion 136 provided in the proximal end of the second piston rod 124 is fitted into the through hole 131 of the third piston member 122. Consequently, positioning of the second piston rod 124 with respect to the main piston body 120 can be performed easily and accurately. In addition, at this time, the weld projection 138 provided on the second piston rod 124 abuts against the second piston member 86.
    [0097] In addition, in a condition where pressure is applied to the second piston rod 124 and the main piston body 120 in the axial direction, both members are electrically energized. When energized, the welding projection 138 provided on the second piston rod 124 is fused by means of resistance heating, and as shown in Figure 13, the main piston body 120 (second piston member 86) and the second rod 124 are joined together. In this way, the piston assembly 10F, which is constituted from the first piston member 84, the second piston member 86, the third piston member 122, the first piston rod 15, and the second piston rod 124 , is obtained.
    [0098] Regarding the moment when the welding of the piston main body 120 and the first piston rod 15 is implemented, and the moment when the welding of the piston main body 120 and the second piston rod 124 is implemented, any one can be carried out in the first place, or both can be carried out simultaneously.
    [0099] Alternatively, the first piston member 84 and the second piston member 86 can be joined integrally by an adhesive, without providing the welding projections 44 on the second piston member 86. In addition, the second piston member 86 and the third member piston 122 can be joined integrally by an adhesive, without providing the welding projections 129 on the third piston member 122. The first piston rod 15 and the main piston body 120 can be joined integrally by an adhesive, without providing the projection welding rod 58 on the first piston rod 15. The second piston rod 124 and the main piston body 120 can be joined integrally by an adhesive, without providing the welding projection 138 on the second piston rod 124.
    [0100] As shown in Figure 13, a ring-shaped sealing member 98 is mounted on an outer circumferential portion (sealing installation groove 96) of the main piston body 120 of the 10F piston assembly, and a magnet (permanent magnet) 140 it is arranged in slot 132. Magnet 140 is made of carbon steel, cobalt steel, Alnico, synthetic rubber, or other materials. The magnet 140 can be ring-shaped, or it can be divided into plural sections in the circumferential direction. In the case where the magnet 140 is ring-shaped, the magnet 140 is installed on the side circumferential wall portion 128 of the third piston member 122, before the second piston member 86 and the third piston member 122 are joined.
    [0101] The piston assembly 10F with the sealing member 98 and the magnet 140 mounted thereon is slidably arranged inside a housing having a sliding orifice that is circular in cross section, to thereby be mounted as a pressure cylinder of fluid. In this case, on an outer surface of the housing, magnetic sensors are attached in positions corresponding to the two stroke ends of the main piston body 120. Magnetism generated by magnet 140 is detected by the magnetic sensors, in which the displacement position of the main body of piston 120 is detected.
    [0102] The piston assembly 10F according to the present embodiment is of a so-called "double rod type" having the first piston rod 15 and the second piston rod 124. However, in comparison with a conventional double rod type of piston assembly, the width (thickness in the axial direction) of the piston main body 120 can be shortened. Thus, the total length of the 10F piston assembly can be made shorter, the overall device can be made on a smaller scale, and the costs can therefore be kept low.
    [0103] In addition, the same advantages and effects as those of the piston assembly 10A according to the first embodiment are obtained in accordance with the piston assembly 10F according to the sixth embodiment.
    [0104] As a modification of the piston assembly 10F, a shape can be adopted that does not include the second piston rod 124. Furthermore, like another modification of the piston assembly 10F, the main piston body 120 can be constituted in an oval shape in the same way as the main piston body 13 of the first embodiment, or alternatively, in an elliptical shape.
    [0105] With the piston assembly 10F, the sealing member 98 is disposed between the first piston member 84 and the second piston member 86, and the magnet 140 is disposed between the second piston member 86 and the third piston member 122. However, the sealing member 98 and the magnet 140 can be arranged at opposite locations. More specifically, magnet 140 can be disposed between the first piston member 84 and the second piston member 86, and the sealing member 98 can be disposed between the second piston member 86 and the third piston member 122. [Other Modifications]
    [0106] In the aforementioned embodiments, the respective constituent elements of piston assemblies 10A to 10F are joined by projection welding. However, the present invention is not limited to this feature, and the respective constituent elements of piston assemblies 10A to 10F can be joined by other welding methods in addition to projection welding.
    [0107] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the aforementioned embodiments and various changes and modifications can be made to it without departing from the scope of the invention.
    权利要求:
    Claims (7)
    [0001]
    Piston assembly (10A to 10F), comprising: a main piston body (13, 60, 88, 100, 120), and a piston rod (15) attached to the main piston body (13, 60, 88, 100, 120), in which: the main piston body (13, 60, 88, 100, 120) includes a first piston member (40, 62, 84) and a second piston member (42, 64, 86) which are made up of plate members; the first piston member (40, 62, 84) and the second piston member (42, 64, 86) are joined together in a condition that they overlap in an axial direction of the piston rod (15); a sealing installation groove (17, 65, 96) extending in a circumferential direction is formed between an outer peripheral edge of the first piston member (40, 62, 84) and an outer peripheral edge of the second piston member (42 , 64, 86); wherein the second piston member (42, 64, 86) has a plate thickness over all of them, and a through hole (47, 66) is arranged in the first piston member (40, 62, 84) so as to penetrate in a plate thickness direction thereof; characterized by a locking portion (56) which is fitted into the through hole (47) and formed to project over one end of the piston rod (15), wherein the piston rod (15) includes a cylindrical body portion ( 54), wherein the locking portion (56) is formed on a proximal end of the body portion (54), and has an outer diameter, which is smaller than that of the body portion (54), and in which the outer diameter thereof is the same as, or slightly smaller than, the inner diameter of the through hole (47) provided in the first piston member (40, 62, 84).
    [0002]
    Piston assembly (10E, 10F), according to claim 1, characterized by the fact that: the main piston body (100, 120) comprises a third piston member (106, 122) consisting of a plate-like member, and in an outer peripheral portion of the main piston body (100, 120), a support member (118) or a magnet (140) that extends along an outer circumference of the main piston body (100, 120) is arranged in a groove (116, 132) formed between the second piston member (86) and the third piston member (106, 122).
    [0003]
    Piston assembly (10F) according to claim 1, characterized by the fact that: the piston rod (15) is joined as a first piston rod (15) to one side of the main piston body (120) by means of welding, and a second piston rod (124) is joined to another side of the main piston body (120).
    [0004]
    Piston assembly (10A to 10F), according to claim 1, characterized by the fact that: the first piston member (40, 62, 84) and the second piston member (42, 64, 86) are joined by welding, and the main piston body (13, 60, 88, 100, 120) and the piston rod (15) are joined by welding.
    [0005]
    Fluid pressure cylinder (11), characterized by the fact that it comprises: the piston assembly (10A to 10F) as defined in claim 1, and a housing (12) that accommodates the piston assembly (10A to 10F) in it movably in the axial direction.
    [0006]
    Method for manufacturing a piston assembly (10A to 10F), comprising: a first step of overlapping a first piston member (40, 62, 84) and a second piston member (42, 64, 86) which are made up of plate-like members, and joining both members to obtain a main body of piston (13, 60, 88, 100, 120), and a second step of joining a piston rod (15) to the main piston body (13, 60, 88, 100, 120), in which: a sealing installation groove (17 65, 96) extending in a circumferential direction is formed between an outer peripheral edge of the first piston member (40, 62, 84) and an outer peripheral edge of the second piston member (42, 64, 86), wherein the second piston member (42, 64, 86) has a plate thickness over all of them, and a through hole (47, 66) is arranged in the first piston member (40, 62, 84) so as to penetrate in a plate thickness direction thereof; characterized by a fitting portion (56) which is fitted into the through hole (47) and formed to project over one end of the piston rod (15), wherein the piston rod (15) includes a cylindrical body portion (54), where the locking portion (56) is formed over a proximal end of the body portion (54), and has an outside diameter, which is smaller than that of the body portion (54), and the outer diameter of which is the same as, or slightly smaller than, the inner diameter of the through hole (47) provided in the first piston member (40 , 62, 84).
    [0007]
    Method for manufacturing a piston assembly (10A to 10F), according to claim 6, characterized by the fact that: in the first step, the first piston member (40, 62, 84) and the second piston member (42, 64, 86) are joined by welding, and in the second step, the main piston body (13, 60, 88, 100, 120) and the piston rod (15) are joined by welding.
    类似技术:
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    同族专利:
    公开号 | 公开日
    KR20140010165A|2014-01-23|
    JP5435434B2|2014-03-05|
    EP2716920A1|2014-04-09|
    TW201309947A|2013-03-01|
    KR101540949B1|2015-07-31|
    US9765800B2|2017-09-19|
    TWI453352B|2014-09-21|
    WO2012165232A1|2012-12-06|
    BR112013031008A2|2016-12-13|
    EP2716920B1|2017-03-22|
    EP2716920A4|2015-05-20|
    MX2013014127A|2014-07-09|
    JP2012251602A|2012-12-20|
    CN103620234A|2014-03-05|
    US20140076157A1|2014-03-20|
    MX349599B|2017-08-04|
    CN103620234B|2016-05-25|
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    KR102012656B1|2017-08-14|2019-08-21|주식회사 크로시스|Piston for Energy Recovery Device of Reverse Osmosis Desalination Systems|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-06-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-26| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 22/05/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011124756A|JP5435434B2|2011-06-03|2011-06-03|Piston assembly, fluid pressure cylinder, and method of manufacturing piston assembly|
    JP2011-124756|2011-06-03|
    PCT/JP2012/063083|WO2012165232A1|2011-06-03|2012-05-22|Piston assembly, fluid pressure cylinder, method for manufacturing piston assembly|
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