• 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:
    A device for damping a cylinder (3) connected to a piston (3) connected to a piston rod (4) in a cylinder housing (2), including a damper recess (8) associated with the piston and one for cooperating with the damper recess regardless of the damping projections (9). ) for mounting to a first cylinder end (5) belonging to a cylinder housing, the damping projection, by means of a first sealing device (12), being arranged to establish a damping chamber in the region of a first position for the piston (3) in cooperation with an abutment portion (17) in the damping recess for damping the movement of the piston (3) inside the cylinder housing. The damping projection (9) extends axially substantially the entire inner length of the cylinder housing with the proximal end (10) connected to the first cylinder end (5) and with a distal, free end (11), in an area inside the hydraulic cylinder opposite the first cylinder end (5). The damping recess (8) extends through the piston and into the piston rod (4) and is arranged to receive the damping projection (9) in said first position. The damping projection (9) has in the region of its free end (11) a second sealing device (15) for establishing in a co-operation abutment portion (17) a damping chamber also in a second position for the piston (3). The invention also relates to a hydraulic cylinder, a shock absorber and a use in a hydraulic cylinder and a shock absorber. Figs. 1 and 2,77039 20110609 pattext; 2011-06-17
    公开号:SE1100471A1
    申请号:SE1100471
    申请日:2011-06-17
    公开日:2012-12-18
    发明作者:Jan Erik Rova
    申请人:Asa Suspension Ab；
    IPC主号:
    专利说明:

    The choke can be constituted by the gap itself between the damper projection and the damper recess, in a specially arranged choke channel arranged a choke or a combination thereof.
    For end position damping in both directions, devices are known which have damping recesses and damping projections associated with the two cylinder ends of the hydraulic cylinder. At the piston rod side, this is e.g. that a damping projection is arranged around the piston rod and that a corresponding damping recess is arranged next to the piston rod opening of the cylinder head in question. Such a solution entails extended axial dimensions to make room for the damping devices.
    THE SPIRIT OF THE INVENTION AND MOST IMPORTANT CHARACTERISTICS The object of the present invention is to provide a further developed device for damping, which allows effective damping in the possibility of a compact design.
    These objects are achieved in a device of the kind mentioned in the introduction by: - that the damping projection is designed to extend axially over an inner portion of the length of the cylinder housing with a proximal end connected to the first cylinder end and with a distal, free end, in an area inside the hydraulic cylinder opposite the first cylinder end, - that the damping recess is designed to extend through the piston and into the piston rod and is arranged to receive the damping projection in said first position, and - that the damping projection in the region of its free end has a second sealing device for cooperating with said abutment portion establish a damping chamber also in a second position for the piston.
    In this way it is achieved that the device can be made axially very compact, since the components belonging to the damper arrangement are in their entirety positionable inside the hollow patent text; 2011-06-17 10 15 20 25 30 the piston and the hollow piston rod of a hydraulic device such as a hydraulic cylinder or a shock absorber.
    As a result, there is no need for elements axially projecting from the piston or cylinder ends, which elements would inevitably mean increased axial length for a hydraulic cylinder or a shock absorber, to which it could be inserted.
    This is a great advantage because maintained stroke for a hydraulic device such as a hydraulic cylinder or a shock absorber can be achieved at axially reduced dimensions.
    Conversely, an increased stroke of a hydraulic device such as a hydraulic cylinder or a shock absorber can be obtained at the same axial dimensions as with a conventional hydraulic device such as a hydraulic cylinder or a shock absorber.
    In that, in a preferred aspect of the invention, each sealing device comprises a conical portion widening in the direction of the respective adjacent end of the damping projection, on which a flexible sealing ring with a conical inside is axially movable, it is achieved that the damping becomes self-regulating.
    The self-regulation is based on the fact that the damping projection has a conical portion, which is widening towards a nearby cylinder head and thus tapers towards the middle of the cylinder, and on which a flexible damping ring with a conical inside is arranged axially movably.
    Depending on the speed of the piston when the damping chamber is established, the damping ring will be pressed more or less onto the conical portion and consequently expand more or less radially. As a result, a damping gap between the periphery of the damping ring and the inside of the damping recess will vary depending on the pressure difference between the sides of the damping ring, which means that the damping will depend on the speed of the piston. The higher the speed of the piston, the greater the damping. 77039 20110609 pattext; 2011-06-17 10 15 20 25 30 It is understood that the damping properties can be adapted to the prevailing conditions for the current application by dimensioning the lengths, diameters, cone angles of the constituent parts as well as the hardness of the sealing rings and their flexible properties.
    Because the damper recess consists of a bore in the piston rod, the production is facilitated and an economically and technically advantageous construction is ensured.
    Suitably the abutment portion is formed in the form of a portion with reduced inner diameter relative to the remaining parts of the damper recess. Preferably, the abutment portion consists of an inner portion of a sleeve inserted in the damper recess.
    It is possible to design the first and the second sealing device so that they are given different characteristics in order to achieve different damping properties for the movements in the two directions of movement of the piston. This may be appropriate if, for example, different forces are involved in the different directions.
    The device according to the invention is advantageously used in a hydraulic cylinder, which has an inlet / outlet for hydraulic fluid, and which is normally arranged to perform a work in connection with a linear movement controlled by the inflow of said hydraulic fluid. The device is then inserted primarily to provide end position damping of the movement of the piston in both directions. The first position of the piston then consists of a first end position and the second position of the piston consists of a second end position.
    The device according to the invention is advantageously also used with a shock absorber, which contains a hydraulic fluid, and which is normally arranged to dampen a movement between two machine parts controlled by the restriction of flow of said hydraulic fluid. The device is then usable to provide extra damping in different length positions or end positions of the piston. 77039 20110609 pattext; 2011-06-17 10 15 20 25 30 BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be explained in more detail with reference to exemplary embodiments and with reference to the drawing, in which: Figs. 1 and 2 show axial sections through a hydraulic cylinder according to the invention with arrangements for end position damping in both directions in a first and a second position, respectively, for the piston.
    DESCRIPTION OF EMBODIMENTS Figs. 1 and 2 illustrate a preferred variant of a hydraulic cylinder 1 according to the invention with a piston 3 damped in both directions, which is connected to a piston rod 4, and which is reciprocable inside a cylinder housing 2.
    A first cylinder end designated 5 has a supply channel 7 for hydraulic fluid. A second cylinder head is designated 6.
    From the first cylinder end 5 a damping projection 9 extends in principle in the form of a central rod, which extends from a proximal end 10 through substantially the entire axial length of the hydraulic cylinder to a distal free end 11.
    In the example shown, the damping projection is a unit comprising a central screw, which cooperates with a screw hole in the first cylinder end. On the screw are threaded components with bores corresponding to the screw, components forming spacers and parts of sealing devices.
    The piston is, as usual, provided with the usual seals for co-operation with the cylinder housing.
    A damping recess 8 is arranged in the piston and the piston rod.
    Together, a cavity in these components forms a recess, constituting said damping recess 8, arranged to receive patete text; 2011-06-17 10 15 20 25 30 the damping projection in a first end position of the piston, as shown in Fig. 1.
    The damping projection 9 has in the region of its proximal end 10 a first sealing device 12 for establishing a damping chamber in the region in cooperation with a bearing portion 17 in the form of a portion, such as a sleeve, with reduced inner diameter, relative to remaining parts of the damping recess. of a first breathing position of the piston 3. This position is shown in Fig. 1.
    The damping projection 9 also has in the area of its free end 11 a second sealing device 15 for establishing, in cooperation with said abutment portion 17, a damping chamber also in an area of a second end bearing for the piston 3, opposite the first cylinder end 5. This position is shown in Figs. 2.
    Each sealing device 12, 15 comprises a conical portion 14 and 16 widening in the direction of the respective adjacent end 10, 11 of the damping projection 9, respectively. On these, a flexible sealing ring 13 and 18 with conical inside is axially movable. The damping thereby becomes self-regulating for reasons that appear from the description above.
    The invention may be modified within the scope of the appended claims. For example, it is possible to design the two damping devices with different characteristics in order to achieve different damping properties for the movements in the two directions of movement of the piston.
    The hydraulic cylinder can be designed differently from what is shown in the drawings, as well as the design of the piston and piston rod and of the abutment portion. The damping projection may be of a different design and was mounted on the first cylinder head by means other than those shown. It is further possible to adjust the length of the parts of the damping projection to ensure that damping takes place at desired positions of the piston. 77039 20110609 pattext; In the above-mentioned exemplary embodiment, the invention has been described in the light of a hydraulic cylinder, but it is nevertheless applicable to a shock absorber.
    A shock absorber according to the invention contains a hydraulic fluid, and is normally arranged to dampen a movement between two machine parts controlled by the restriction of flow of said hydraulic fluid. The device according to the invention can be used to provide additional damping in different longitudinal positions or end positions of the piston. The piston can in this case have normal sealing arrangements vis-à-vis the cylinder housing and the first and second sealing devices can be arranged for damping in other positions than end positions to adapt the shock absorber to the needs of current applications. 77039 20110609 pattext; 2011-06-17
    权利要求:
    Claims (8)
    [1]
    Device for damping a reciprocating piston (3) connected in a cylinder housing (2) to a cylinder, connected to a piston rod (4), including an internal damping recess (8) associated with the piston and one intended for co-operation with the damping recess damping projections (9) for mounting at a first cylinder end (5) belonging to the cylinder housing, the damping projection, by means of a first sealing device (12), being arranged to establish a damping chamber in the region of a first position for the piston (3) in cooperation with an abutment portion (17) in the damping recess for damping the movement of the piston (3) inside the cylinder housing, characterized in that the damping projection (9) is designed to extend axially over an inner portion of the length of the cylinder housing with a proximal end (10) connected to the first cylinder end (5) and with a distal, free end (11), in an area inside the hydraulic cylinder opposite the first cylinder end (5), - that the damping recess (8) is designed to extend through the piston and into the piston rod (4) and is arranged to receive the damping projection (9) in said first position, and - that the damping projection (9) in the region of its free end (11) has a second sealing device (15) for cooperating with said abutment portion (17) establish a damping chamber also in a second position for the piston (3).
    [2]
    Device according to claim 1, characterized in that each sealing device (12; 15) comprises a conical portion (14; 16) widening in the direction of the respective adjacent end of the damping projection (9), on which a flexible sealing ring (13; 18) with conical inside is axially movable. 77039 20110609 pattext; 20ll-06 ~ l7 10 15 20 25
    [3]
    Device according to Claim 1 or 2, characterized in that the damper recess (8) consists of a bore in the piston rod.
    [4]
    Device according to Claim 1, 2 or 3, characterized in that the abutment portion (17) is in the form of a portion with a reduced inner diameter relative to the remaining parts of the damper recess.
    [5]
    Device according to one of the preceding claims, characterized in that the first and the second sealing device (12; 15) have different characteristics in order to achieve different damping properties for the movements in the two directions of movement of the piston (3).
    [6]
    Hydraulic cylinder with a reciprocating piston in a cylinder housing, between two cylinder ends, to which a piston rod is connected, the hydraulic cylinder including a device according to any one of claims 1-5.
    [7]
    Shock absorber with a reciprocating piston in a cylinder housing, between two cylinder ends, to which a piston rod is connected, the shock absorber including a device according to any one of claims 1-5.
    [8]
    8.. Use of a device according to any one of claims 1 to 5 in one of the groups: a hydraulic cylinder, a shock absorber. 77039 20110609 pattext; 2011-06-17
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    同族专利:
    公开号 | 公开日
    SE536053C2|2013-04-16|
    EP2721307A4|2015-07-08|
    EP2721307A1|2014-04-23|
    WO2012173550A1|2012-12-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR1361134A|1963-06-25|1964-05-15|Bbc Brown Boveri & Cie|Air damped pneumatic control system|
    US3559776A|1969-06-17|1971-02-02|Gen Motors Corp|Shock lockout and piston system|
    DE2755878A1|1977-12-15|1979-06-21|Licentia Gmbh|HYDRAULIC WORK CYLINDER WITH ADJUSTABLE DAMPING|
    US4352318A|1980-03-06|1982-10-05|Miller Fluid Power Corporation|Expandable cushion plunger for piston and cylinder devices|
    DE3017403A1|1980-05-07|1981-11-12|Stabilus Gmbh, 5400 Koblenz|HYDROPNEUMATIC FEED CYLINDER|
    CH677963A5|1989-01-23|1991-07-15|Hydraulika Gmbh|Hydraulic or pneumatic operating cylinder - has cylinder piston and piston rod, brake cylinder and brake bushing with throttles|
    US5224413A|1992-07-13|1993-07-06|Mosier Industries, Inc.|Impact dampening means for power cylinders|
    US6481335B2|1999-12-23|2002-11-19|Mark Y. Shteynberg|Hybrid actuator|
    US6536327B2|2001-06-08|2003-03-25|Festo Corporation|Double acting cylinder with integral end position volume chambers|
    ITTO20020504A1|2002-06-14|2003-12-15|Vep Automation Srl|ARM SWING DAMPING DEVICE OF A SWING LEVER TYPE HANDLING EQUIPMENT|CN103438049B|2013-08-30|2016-05-04|长治清华机械厂|Probing analyzer oil cylinder|
    WO2016127382A1|2015-02-13|2016-08-18|National Oilwell Varco Petroleum EquipmentCo., Ltd.|Reciprocating pump|
    法律状态:
    2016-02-02| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1100471A|SE536053C2|2011-06-17|2011-06-17|Device for damping in a piston cylinder device|SE1100471A| SE536053C2|2011-06-17|2011-06-17|Device for damping in a piston cylinder device|
    PCT/SE2012/050561| WO2012173550A1|2011-06-17|2012-05-25|Device for damping of a piston inside a cylinder housing|
    EP12800071.8A| EP2721307A4|2011-06-17|2012-05-25|Device for damping of a piston inside a cylinder housing|
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