• 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:
    The invention relates to an actuating device for an actuating mechanism of a variable compression ratio mechanism, the device comprising a control link (12), an arm link (13) rotatably connected to the link control rod, a control rod (11), a housing having a receiving portion in which a connection portion between the control link and the arm connection is received, and a bearing hole which rotatably supports the control rod ; the control rod (11) having an attachment portion inserted into and mounted within the receiving portion in a predetermined axial position, and a first journal portion which is formed at an end portion of the control rod (11), which has a diameter smaller than a diameter of the attachment portion, and which is supported by a first support hole.
    公开号:FR3017158A1
    申请号:FR1550757
    申请日:2015-01-30
    公开日:2015-08-07
    发明作者:Junichiro Onigata；Yoshihiko Yamada；Kishiro Nagai
    申请人:Hitachi Automotive Systems Ltd；
    IPC主号:
    专利说明:

    [0001] The invention relates to a device for actuating a variable compression ratio mechanism shaped to vary a momentary compression ratio of an internal combustion machine, and a connecting mechanism used for a variable valve actuation apparatus which is shaped to vary valve operating characteristics of an intake valve or an exhaust valve. Japanese Patent Application Publication No. 2011-169152 discloses an earlier mechanism for varying the compression ratio, which utilizes a mechanism with a plurality of piston-crank fasteners and which is adapted to vary a mechanical compression ratio and a geometric rate. compression of an internal combustion machine. That is, a piston and a crankshaft are connected to each other by an upper link and a lower link. A position of the lower link is controlled by controlling the actuator. By this, the compression ratio of the engine is controlled. The actuator comprises a housing, a speed reduction device and a drive motor which are mounted on an outer face of the housing, and a control rod (a second control rod in the aforementioned patent application). high) which are housed in the housing, which are rotatably supported, and to which a rotational force from the speed reduction device is transmitted, and an eccentric shank portion (a second eccentric portion in the above mentioned patent application). high) fully disposed at one end of the control rod, and a control link which has a first end attached to a lower link and a second end attached to an eccentric portion 35 of the control rod which extends parallel to a crankshaft.
    [0002] A rotational position of the control rod is varied by the rotational force from the drive motor and the speed reduction device. By this, a position of the lower link is controlled by the eccentric portion of the rod and the control link. However, in the conventional mechanism for varying the compression ratio described in the patent application cited above, the eccentric portion of the rod is fully disposed at the end of the control rod. Therefore, to mount the control rod on the housing, it is necessary that the housing includes an insertion hole in which the eccentric portion of the rod can be inserted, or that the housing is divided in two and that the rod of control is supported in a state where the control rod is sandwiched by the support portions of the housing divided in two. It follows that the dimensions and the weight of the housing are increased.
    [0003] For this purpose, it is the object of the present invention to provide a connecting mechanism for a vehicle and an actuating device for a variable compression ratio mechanism which is shaped to solve the problems mentioned above and to avoid an increase in the size and weight of a crankcase. According to one aspect of the present invention, the object of the invention is achieved with an actuating device of a variable compression ratio mechanism shaped to vary at least one of the two positions which are the top dead center and the point low death of an internal combustion machine, and to vary a mechanical compression ratio, the device comprising: a control link having a first end connected to the piston and a second end, and arranged to vary a characteristic position of the piston; an arm link rotatably connected to the second end of the control link; a control rod which is an element other than the arm link and to which the arm link is attached; a housing having a receiving portion in which a connecting portion between the second end of the control link and the arm connection is received, and a support hole formed in the housing and rotatably supporting the control rod; a speed reduction device arranged to reduce a rotational speed of the motor and to transmit the reduced rotation to the control rod, the control rod having an attachment portion inserted into and mounted within the receiving portion in a predetermined axial position, and a first trunnion portion which is formed at an end portion of the control rod, which has a diameter less than a diameter of the attachment portion, and which is supported by a first bearing hole formed in a the support hole. The invention also relates to the following features taken alone or in combination: the control rod comprises a second trunnion portion which is located in a position opposite to the end portion for sandwiching the attachment portion, and which has a diameter greater than an outer diameter of the attachment portion; the arm connection comprises a fixing hole which is fixed or formed to the fastening portion of the control rod, a protruding portion formed on the outer circumference portion of the control rod, and a connecting hole which is formed in the projecting portion and which is connected to the control link; the fixing portion of the control rod is fixed in the hole for fixing the arm connection by a tight fit; the control link has a stepped portion formed between the second bearing hole and the attachment portion; and the arm connection has a first end portion shaped to be limited in its movement in the axial direction by the stepped portion; the control rod is made of a ferrous metal (iron series metal) and in that the second bearing hole is made of an aluminum alloy; the control link has a first end portion which is rotatably connected by a connection pin inserted into a connection hole formed in a second end portion of the arm link; the speed reduction device has an internal toothing which has a precise circular shape, which is fully connected to the control rod and which has an inner circumference with inner teeth, an external toothing which is disposed on the inner circumference side. of the inner toothing and having an outer circumference with outer teeth meshing with the inner teeth, which vary in shape flexibly and the number of which is less than a number of teeth of the internal toothing, and a generating device wave-forming device having an outer circumference disposed adjacent the surface of the inner circumference of the outer toothing and shaped to be adjacent to the outer toothing on the internal toothing by rotation of the motor. According to another aspect of the present invention, the object of the invention is achieved with a device for driving a link mechanism, the device comprising: a control link having a first end connected to the link mechanism and a second end; a control rod rotatably connected to the second end of the control link by an arm connection; an arm link rotatably connected to the second end of the control link; a control rod which is an element other than the arm link and to which the arm link is attached; a housing having a receiving portion receiving a connection portion of the second end of the control link and the arm connection, and rotatably supporting the control rod passing through the receiving portion; and a speed reduction device arranged to reduce a rotational speed of the motor and to transmit the reduced rotation to the control rod, the control rod having a fixing hole in which the control rod is inserted and fixed to the control rod. inside the receiving part. According to one embodiment of the invention, the above device may have the following characteristic: the control rod has a second trunnion portion which is positioned in a position opposite to the end portion to sandwich the fixing portion and having a diameter greater than an outer diameter of the fixing portion. Other features, details and advantages of the invention are described with the aid of embodiments shown in the drawings, in which - Figure 1 is a schematic view showing one embodiment of the invention, - the figure 2 is a perspective view showing a device for actuating a variable rate mechanism according to the present invention; FIG. 3 is an exploded perspective view showing the actuation device according to the first embodiment; FIG. 4 is a top view of the actuator; FIG. 5 is a view on the left side of the actuator; FIG. 6 is a longitudinal section of the actuator; FIG. a sectional view showing a main part of the first embodiment; FIG. 8 is a sectional view showing a step in which a control rod is mounted on a control rod in the first embodiment Figure 9 is a longitudinal section showing an actuator according to a second embodiment of the present invention. In these embodiments, there is provided a variable compression ratio (VCR) mechanism adapted to vary a mechanical compression ratio of an internal combustion engine with four in-line cylinders, and an actuator therefor . FIRST EMBODIMENT FIG. 1 schematically represents a variable compression ratio mechanism according to the present invention. This is identical to an earlier structure of Figure 1 of published Japanese Patent Application No. 2011-169152. Therefore, it is briefly described. The mechanism comprises an upper link 3 with an upper end rotatably attached to a piston pin 2 of a piston 1 which is reciprocated in a cylinder of a cylinder block of a combustion engine. internal combustion; and a lower link 5 which is rotatably attached to an axis 4a of a crankshaft 4. The lower link 5 is rotatably attached to a lower end of the upper link 3 by a connecting pin 6. The lower link 5 is rotatably attached to an upper end portion of a first control link 7 by a connecting pin 8. The first control link 7 has a lower end portion attached to a connection mechanism 9 formed by a plurality of connecting elements. This connecting mechanism 9 comprises a first control rod 10, a second control rod 11 which is a control rod, and a second control link 12 which is a control link interconnecting the first control rod 10 and the second control rod 11. The first control rod 10 extends inside the engine parallel to the crankshaft 4 in a direction of the line of the cylinders. The first control rod 10 has a first journal portion 10a rotatably supported by a main body of the motor, a plurality of eccentric control rod portions 10b, on each of which is mounted a lower end portion of the first control link 7 of each cylinder, and an eccentric portion 10c of control rod on which is rotatably mounted a first end portion 12a of the second control link 12. Each of the eccentric portions 10b of the rod The control portion is disposed by a first arm portion 10d in a position which is eccentric, i.e., remote, from the first journal portion 10a of a predetermined measurement. Similarly, the stem eccentric portion 10c is disposed by a second arm portion 10e in a position that is eccentric to the first trunnion portion 10a by a predetermined amount. The second control rod 11 is rotatably supported within a housing 20 (described later) by a plurality of journal portions. An arm link 13 is attached to and mounted on the second control rod 11. The arm link 13 is rotatably attached to the second end portion 12b of the second control link 12.
    [0004] As shown in Figures 2 and 3, the second control link 12 is in the form of a lever. The second control link 12 has a first end portion 12a having a substantially straight shape to which the stem eccentric portion 10c is attached, and a second end portion 12b having substantially an arcuate (curved) shape by bending and The first end portion 12a of the second control link 12 has an insertion hole 12c which is formed in a tip portion of the first end portion 12a, which passes through the first end portion 12a and through which the eccentric shaft portion 10c is rotatably mounted. On the other hand, the second end portion 12b of the second control link 12 has point portions 12d and 12d which are in the form of a fork (a two-pronged fork). A protruding portion 13b (described later) of the arm connection 13 is sandwiched and held between the tip portions of the second end portion 12b. In addition, the second end portion 12b has attachment holes 12e and 12e which pass through the second end portion 12b and in which a fastening pin 14 attached to the projecting portion 13a is adapted and mounted.
    [0005] The arm link 13 is formed independently of the second control rod 11. The arm link 13 is made of ferrous metal formed into a ring with a large thickness. The arm connection 13 has a tight-fitting hole 13a which is formed in a substantially central portion of the arm link 13 and which is adapted and mounted on an attachment portion formed between the front and rear play portions of the second rod. 11, and a protruding portion 13b having a U-shape and which is formed on an outer periphery of the arm link 13 and which extends in the radial direction. The closely fitting hole 13a and the projecting portion 13b are integrally formed to form the arm connection 13. The projecting portion 13b has a connection hole 13c in which a connecting pin 14 is rotatably accommodated. A shank center (connecting pin 14) of this connection hole 13c is eccentric from the shank center of the second control rod 11 radially by the projecting portion 13b. The second control rod 11 is adapted to vary a rotational position by a moment (torque, rotational force) transmitted from a driving motor 22 via a speed reduction device 21 which is part of the actuating device, and thereby rotating the control rod 10 by the second control link 12, and to change a position of the lower end portion of the first control link 7. With this, a position of the lower link 5 is varied from way that the stroke characteristic of the piston 1 is varied. Consequently, the compression ratio of the engine is varied according to the variation of the stroke characteristic of the piston 1. As shown in FIGS. 2 to 7, the actuating device comprises the second control rod 11, a casing 20 rotatably supporting the second control rod 11 within the housing 20, the speed reduction device 21 disposed in a rear portion of the housing 20, and a drive motor 22 disposed on a rear end portion of the housing 20; speed reduction device 21. The second control rod 11 comprises a rod main body 23 which is entirely of ferrous metal, and a fastening flange 24 disposed entirely in a rear part of the main body of rod 23. The main body of rod 23 has a stepped shape in an axial direction. The main stem body 23 has a first trunnion portion 23a which is located in a tip portion and which has a small diameter, a fastening portion 23b which has a mean diameter, which is disposed in an intermediate portion and to which is adapted the arm connection 13 from the side of the first trunnion portion 23a through the tight-fitting hole 13a, and a second trunnion portion 23c which has a large diameter and which is located on the side of the fastening flange 24. Further the main stem body 23 has a first stepped portion 23d located between the attachment portion 23b and the second trunnion portion 23c, and a second stepped portion 23e located between the first trunnion portion 23a and the attachment portion 23b. The first stepped portion 23d has an end hole edge located on the side of the second trunnion portion 23c. When the tight-fitting hole of the arm connection 13 is fitted to the attachment portion 23b from the side of the first journal portion 23a, this end hole edge is adjacent in the axial direction. By this, the first stepped portion 23d limits the movement of the link arm 13 towards the second trunnion portion 23c. On the other hand, when the stem main body 23 is inserted into a support hole 30, the second stepped portion is adjacent a stepped hole edge 30c (described later) of the support hole 30 to limit movement in the axial direction.
    [0006] The fastening flange 24 has six bolt insertion holes 24a, which are formed in an outer peripheral portion of the fastening flange 24 at regular intervals in the circumferential direction and through the fastening flange 24. The fastening flange 24 is attached through a load plate 26 to a circular hoop which is an internal toothing of the speed reduction device 21, by six bolts 25 inserted through the bolt insertion holes 24a. The casing 20 is made of aluminum alloy. The housing 20 has a substantially cubic shape. The housing 20 includes an opening portion 20a which is located on a rear side, which has a large diameter, which is circular in shape and which is closed by means of an O-ring 51 by a cover 28. Further , the housing 20 has a first side surface 20b and a receiving chamber 29 which constitutes a receiving portion extending inside the housing 20 of the first side surface 20b in a lateral direction. In addition, the housing 20 has a support hole 30 which extends inside the housing 20 from a bottom surface of the opening portion 20a in an axial direction, and wherein the main stem body 23 is inserted and disposed, and which passes through the housing 20 in a direction perpendicular to the receiving chamber 29. In addition, there is a holding hole 31 extending from the support hole 30 in the axial direction.
    [0007] The holding hole 31 receives an angle sensor 32 adapted to capture an angular position of rotation of the control rod 13. In addition, the casing 20 is connected to cooling water conduits 44a and 44b which are arranged to supplying and discharging the cooling water cooling the angle sensor 32, in the and the housing 20.
    [0008] The cover 28 has an insertion hole 28a for a motor shaft, which is disposed in a substantially central position of the cover 28 and which passes through the cover 28, four protruding portions which rise from a surface of around the cover 28 in the radial direction, and bolt insertion holes which are formed in the protruding portions 28, which pass through the projecting portions 28, and in which four bolts 43 are inserted from the motor side 10 The cover 28 is fixed to the housing 20 by four bolts 43. As shown in FIGS. 6 and 7, the receiving chamber 29 receives a connection portion between the second end portion 12b of the 12 and the arm connection 13 via the connection axis 14. Thus, the receiving chamber 29 comprises an entire space to ensure the oscillatory free movements of the control link 12 and the link by In addition, the receiving chamber 29 has a width slightly larger than the width of the second end portion 12b of the control link 12 to suppress a running clearance. As shown in FIG. 6, the support hole 30 has a stepped shape so that an outside diameter of an inner periphery surface of the support hole 30 corresponds to an outside diameter of the main stem body 23 of the second control rod 11. The support hole 30 comprises a first bearing hole 30a 30 with a small diameter and in which the first journal portion 23a is supported, a position corresponding to the position of the fixing part 23b, ie ie an open portion to the receiving chamber 29, and a second bearing hole 30b which has a large diameter and in which the second trunnion portion 23c is supported. The first bearing hole 30a has a stepped hole edge 30c which is oriented toward the receiving chamber 29 and which is adapted to be adjacent to the second stepped portion 23e in the axial direction when the stem main body 23 is inserted into the hole support 30 to prevent further insertion of the second stem main body 23. In addition, the limitation of the maximum insertion movement position is also limited by placing the inner periphery portion of the adjacent fastening flange 24. at the outer edge of the second bearing hole 30b. As shown in FIGS. 2 and 3, the angle sensor 32 has a cap-like sensor cap 23a which is secured to the inner periphery surface of the retaining hole 31 by close fitting. a rotor 32b for angle sensing and which is disposed on the inner periphery surface of the central cover 32a, and a sensor portion 32c which is disposed in a substantially central portion of the sensor cover 32a and which is arranged to pick up the rotational position of the rotor 32b. The sensor portion 32c is adapted to provide the sensed signal to a control unit (not shown) shaped to sense an operating state of the engine. The rotor 32b has a protruding portion 32d of the tip portion secured in a mounting hole which is disposed on the tip side of the stem main body 23. A portion between the sensor cover 32a and the holding hole 31 is sealed by a seal 33. The sensor cover 32a is mounted together with the sensor portion 32c on the housing 20 by two bolts 34. In addition, three O-rings 35 are provided on an outer periphery of the cylindrical portion of the cover. sensor 32a to limit oil intrusion in one direction to the sensor portion 32c. The speed reduction device 21 is of the "Harmonic Drive" type. Components forming the speed reduction device 21 are housed in the opening portion 20a of the housing 20 which is closed by a cover 28. Thus, the speed reduction device 21 comprises a first ring 27 which has an annular shape, which is secured to the attachment flange 24 of the stem main body 23 by bolts, and which has an inner periphery on which a plurality of inner teeth 27a is formed, a flexible ring 36 which is disposed within the first circular ring 27, which is an outer pinion having an outer periphery surface with a plurality of outer teeth 36a engaged in the inner teeth 27a, and which can flexibly change shape, a wave generator (wave generation device); wave) 37 having an outer periphery surface having an oval shape and which is slid over a portion of the inner circumferential surface of the flexible core 36, e which has an inner periphery surface formed with inner teeth 38a meshing with the outer teeth 36a. The first circular hoop 27 has six threaded inner holes 27b which are formed at regular intervals in the circumferential direction and in which bolts 25 are screwed respectively. The flexible ring 36 is made of a metallic material. The flexible ring 36 is formed into a cylindrical thin shape that can flexibly vary. The number of teeth of the outer teeth 36a is one more than the number of teeth of the inner teeth 27a of the first circular ring 27. The wave generator 37 has a through hole 37a which has a relatively large diameter and which is formed with a substantially circular shape in a substantially central portion of the wave generator 37, and a plurality of inner teeth 37b which are formed on an inner periphery surface of the through hole 37a. In addition, the wave generator 37 has a cylindrical portion projecting from the front and rear edges of the through holes 37a in the axial direction. The wave generator 37 is rotatably supported by this cylindrical portion and front and rear ball bearings 39 and 40 which are disposed between the attachment flange 24 and the wave generator 37 and between the generator 37 and the cache 28. In addition, the oval outer periphery surface of the wave generator 37 is formed with a flat shape. The oval outer periphery surface of the generator 37 is adjacent to and slid over a flat inner periphery of the flexible hoop 36. The second circular hoop 38 has a flange portion 38b which is located on an outer periphery of the second circular hoop 38, and six holes for insertion of bolts which pass through the second circular ring 38. The second circular ring 38 is fixed through a load plate 42 on an inner end portion of the cover 28 by six bolts inserted into the insertion holes of the second circular ring 38. In addition, the second circular ring 38 has inner teeth 38a whose number of teeth is identical to the number of teeth of the outer teeth 36a of the flexible ring 36. Therefore, the number of teeth of the inner teeth 38a of the second circular ring 38 is one more than the number of teeth of the inner teeth 27a of the first circular ring 27. The reduction ratio speed is determined by this difference in the number of teeth. The drive motor 22 is a brushless electric motor. As shown in FIGS. 3 and 6, the drive motor 22 has a motor housing 45 having a cylindrical shape with a bottom, a cylindrical coil 46 which is fixed on an inner periphery surface of the motor housing 45, a magnetic rotor 47 which is rotatably disposed within the coil 46, and a motor shaft 48 which has a first end portion 48a attached to a substantially axial central portion of the magnetic rotor 47. The motor housing 45 further comprises four protruding portions 45a formed on an outer periphery 5 of a front face of the motor housing 45, and bolt insertion holes 45b which are formed in the respective four protruding portions 45a. The motor housing 45 is mounted by an O-ring 50 on a rear end portion of the cover 28 by four bolts 49 inserted into the bolt insertion holes 45b. In addition, a connector portion 67 is fully provided in the outer periphery of the motor housing 45. The connector portion 67 is arranged to receive a control current from the control unit. The magnetic rotor 47 has an outer periphery on which positive magnetic poles and negative magnetic poles are alternately arranged in the circumferential direction. In addition, the magnetic rotor 47 has a fixing hole 47a which is disposed in a substantially axial central portion, which passes through the magnetic rotor 47 and in which the first end portion 48a is inserted in close fitting. The drive shaft 48 has a first end portion 48a which extends from an end surface of the magnetic rotor 47 and which has a tip portion supported by a ball bearing 52 of which an outer wheel is attached to a wall of the motor housing 4, and a second end portion 48b which is supported by a ball bearing 53, an outer wheel of which is attached to an inner periphery of the insertion hole 28a of the cover 28 for the motor shaft. In addition, the drive shaft 48 has outer teeth 48c formed on an outer periphery surface of the second end portion 48b and meshing with the inner teeth 37b of the wave generator 37.
    [0009] The ball bearing 53 is held in the cache holding groove 28 through a substantially disk-shaped retaining member 54 by screws 55.
    [0010] A resolver 55 is disposed in a substantially central position of the motor shaft 48 in the axial direction. The resolver 55 is adapted to sense an angle of rotation of the drive shaft 48. The resolver 55 includes a resolver rotor 55a which is attached to the outer periphery of the drive shaft 48 in a snug fit, and a sensor portion 55b which is adapted to detect a target in the form of a composite sheet which is formed on an outer periphery surface of the resolver rotor 55a. The sensor portion 55b is secured within the cover 28 by two screws 56. In addition, the sensor portion 55b is adapted to output a sensor signal to the control unit. The second control rod 11 has an insertion portion which extends inside the second control rod 11 in the axial direction and which is adapted to introduce pressurized lubricating oil and sent by a pump to the pump. oil (not shown), and a plurality of radial holes 65a and 65b connected to the introduction portion. That is, the introducer portion has an oil chamber 64a that has a substantially conical shape, which is formed in a substantially central position of the attachment flange 24 and to which the lubricating oil is supplied from an oil hole (not shown), and an axial hole 64b which extends inside the second control rod 11 from the oil chamber 64a in an axial central direction of the second control rod 11. The radial hole 65a has an inner end which is open at a tip portion of the axial hole 64b, and an outer end which is open to a free space between the outer periphery surface of the first portion. trunnion 23a and the first bearing hole 30a. The radial hole 65b provides the lubricating oil thereto (i.e. the inner end and the outer end). As shown in FIG. 7, the other radial hole 65b is connected to an oil hole 65c formed inside the arm connection 13. The other radial hole 65b is adapted to supply the oil of lubricating through the hole 65c to a portion between the inner periphery surface of the connection hole 13 and the outer periphery surface of the connection axis 14. OPERATION OF THIS EMBODIMENT In the configuration described above according to the embodiment when the arm link 13 is mounted on the rod main body 23 of the second closely fitting control rod 11, first as shown in Fig. 8, in a state where the second end portion 12b of the control link 12 and the projecting portion 13b of the link arm 13 have been previously connected by a connection axis 14, this connection portion is received, positioned and fixed in the receiving chamber 29 by two templates 62 and 63 . In C and state, the stem main body 13a is inserted into the closely fitting mounting hole from the side of the tip portion (first journal portion 23a). The outer periphery surface of the attachment portion 23b is mounted in a tight fit in the axial direction until the first stepped portion 23d is adjacent the edge of the end hole. Then, by detaching the templates 62 and 63, the assembly operation of the link arm 13 is complete. In this way, in this embodiment, the second control rod 11 and the arm link 13 are separated. The arm connection 13 is connected within the receiving chamber 29 to the stem main body 23. Therefore, and unlike the prior art that the stem main body 23 and the arm link 13 are formed integrally, it is not necessary that the inside diameter of the insertion hole of the motor shaft 30 of the housing 20 is made with a large diameter to insert the connection arm 13. It is rather absolutely not necessary that the housing 20 is divided into an upper part and a lower part.
    [0011] Therefore, it is possible to eliminate the increase in the overall size of the casing 20 and to improve the reduction of the size and weight of the casing 20. Thus, it is possible to improve the manner of mounting the gear mechanism. variable compression on the engine. In addition, the second control rod 11 and the arm link 13 are distinct elements. Thus, it is possible to improve the freedom of the length of the link arm 13 and to put it to a great length according to the size of the receiving chamber29. Thus, it is possible to decrease an inverted input load of the control link 12 to the side of the second control rod 11. For this, it is possible to reduce the loads on the speed reduction device 21 and the driving motor 22. The main stem body 23 has a stepped shape ranging from a second journal portion 23c having a maximum diameter, through a fixing portion 23b having a mean diameter, to a first journal portion 23a having a diameter minimal. Thus, it is possible to improve the insertion operation in the support hole 30. In addition, the arm connection 13 is secured by the snug hole 13a to the attachment portion 23b of the rod main body 23. in the axial direction in close fitting. Thus, it is possible to make the connection operation between the arm connection 13 and the main stem body 23 easier. In addition, the second stepped portion 23e of the main stem body 23 is adjacent to the stepped hole edge 5 30c of the support hole 30. By this, it is possible to make easier the positioning of the main body 23 in the axial direction during the insertion of the main body of rod 23. In addition, it is possible to limit the position of the arm connection 13 in the axial direction to the tight fit using the first stepped portion 23d of the stem main body 23. Thus, it is possible to make positioning easier at this point. The stem main body 23 is supported by first 30b of the portions and second trunnion support hole holes 23a and front and rear bearing 30a and via the first and second 23c. Thus, it is possible to support the second rod in a stable manner. In addition, the rod main constant control body 23 of the second control rod 11 is made of ferrous metal. On the other hand, the housing 20 with the first and second bearing holes 30a and 30b are entirely formed of an aluminum alloy. By this, the difference between the iron and the aluminum alloy by thermal expansion and contraction becomes small since the first bearing hole 30a has a small diameter. Thus, it is possible to suppress the twisting generation caused by the clearance between the first journal portion 23a and the first bearing hole 30a. SECOND EMBODIMENT MODE FIG. 9 is a view showing a second embodiment of the present invention. The second embodiment has a basic structure identical to that of the first embodiment. With respect thereto, the structure of the wave generator 37 is changed. Indeed, the outer periphery portion of the wave generator 37 has a width identical to that of the first embodiment. However, the wave generator 37 has an inner periphery portion 37c on which the front and rear ball bearings 39 and 40 are mounted. This inner periphery portion of the wave generator 37 has an axial width W which is larger. than that of the first embodiment. In addition, the inner teeth 37b formed on the through hole 37a of the inner periphery portion 37c have an axial length greater than that of the first embodiment. On the other hand, the second end portion 48b of the drive shaft 48 has a large axial length along the inner periphery portion 37c. In addition, the axial length of the outer teeth 48c is increased. Therefore, according to the present embodiment, a width of the engagement between the outer teeth 48c of the drive shaft 48 and the inner teeth 37b of the wave generator 37 becomes large. Thus, it is possible to stably transmit the moment (i.e. the rotational force) of the drive shaft 48. In this embodiment, the configuration according to which the stem main body 23 and the arm link 13 are separated is identical to that of the first embodiment. Thus, it is possible to obtain the same operations and functions. The present invention is not limited to the configuration of the embodiments. For example, a seam connection and a bolt seal may be used as means for securing the arm connection 13 with respect to the shank main body 13, in addition to the snug fit assembly.
    [0012] In addition, the present invention can be applied to actuators of other vehicle connecting mechanisms, in addition to the variable compression ratio actuator. For example, the present invention is applicable to an actuating device of a variable operating angle mechanism which is a variable valve operating mechanism adapted to vary an operating angle of a valve of an engine. combustion by the operation of a connecting mechanism. [a] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the control link has a stepped portion formed between the second support hole and the attachment portion, and the arm connection comprises a first end portion adapted to be limited in its movement in the axial direction by a stepped portion. By the present invention, the arm connection is disposed in the axial direction by the stepped portion. Therefore, it is possible to make assembly easier. [b] In the actuating device of a variable rate mechanism, according to the embodiments of the present invention, the control rod is of ferrous metal, and the housing assembly with the first bearing hole and the second bearing hole is aluminum alloy. According to this invention, the casing is made of aluminum alloy. Thus, it is possible to obtain a weight reduction. In addition, the first bearing hole has a small diameter. As a result, the difference between iron and aluminum alloy by thermal expansion and shrinkage becomes small. Thus, it is possible to suppress the twisting resulting from the play of the first bearing hole. [c] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the control link includes a connection pin inserted into a connection hole formed in a second part of end of the link by arm. [d] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the speed reduction device is of Harmonic Drive (trademark) type. The speed reduction device is fully fixed on the control rod. The speed reduction device comprises an inner gear with an inner periphery formed with inner teeth and having a precisely circular shape, and a flexible-shaped outer gear which is arranged on the inner periphery side of the inner gear. and which has an outer periphery formed with outer teeth which mesh with the inner teeth, which is engaged in the inner teeth and whose number of teeth is smaller than that of the teeth; and a wave generating device has an oval outer periphery surface to which is adjacent an inner periphery surface of the outer gear which is adapted to be adjacent to the outer gear on the inner gear by rotation of the motor. [e] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the housing receiving portion has an opening portion open to the outside. [f] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the support hole formed inside the housing is formed in a direction through the receiving portion. [g] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the control rod is inserted into the support hole after the arm connection is received in the receiving, so that the trunnion portion is disposed within the support hole. By this invention, it is possible to form the housing integrally by forming the support portion and the support hole without dividing the housing. [h] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the fastening portion of the control rod is fixed in the attachment hole of the arm connection. when the control rod is inserted into the support hole. [i] In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the control rod has a stepped surface formed between the fastening portion and the first trunnion portion on the side. of the tip, and the stepped surface of the control rod is adjacent a hole edge portion formed between the housing receiving portion and the first bearing hole to limit an axial position of the control rod. By this invention, it is possible to position the control rod relative to the support hole of the housing in the axial direction. Thus, it is possible to improve the assembly operation of the control rod. In the actuating device of a variable compression ratio mechanism according to the embodiments of the present invention, the actuating device further comprises an angle sensor disposed on the side of the first bearing hole of the invention. support hole and adapted to capture an angle of rotation of the control rod. Although the invention has been described with reference to certain embodiments of the invention, the invention is not limited to the described embodiments. Modifications and variations of the embodiments described above are open to those skilled in the art in light of the above teachings.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. An actuating device of a variable compression ratio mechanism shaped to vary at least one of the two positions which are the top dead center and the bottom dead center of an internal combustion machine, and to vary a mechanical compression ratio the apparatus comprising: a control link (12) having a first end connected to the piston and a second end, and arranged to vary a characteristic position of the piston; an arm link (13) rotatably connected to the second end of the control link; a control rod (11) which is an element other than the arm link and to which the arm link is attached; A housing (20) having a receiving portion in which a connection portion between the second end of the control link (12) and the arm link (13) is received, and a support hole (30) formed in the housing and rotatably supporting the control rod; and a speed reduction device (21) arranged to reduce a rotational speed of the motor and to transmit the reduced rotation to the control rod (11), the control rod (11) having an attachment portion inserted into and mounted within the receiving portion in a predetermined axial position, and a first journal portion which is formed at an end portion of the control rod, which has a diameter less than a diameter of the attachment portion and which is supported by a first bearing hole (30a) formed in the support hole (30).
    [0002]
    2. Device for the variable compression ratio mechanism according to claim 1, characterized in that the control rod (11) comprises a second trunnion portion which is located in a position opposite to the end portion for sandwiching the fixing portion, and which has a diameter greater than an outer diameter of the attachment portion.
    [0003]
    Device for the variable compression ratio mechanism according to claim 2, characterized in that the arm connection (13) has the fixing hole which is on the attachment portion of the control rod, a projecting portion formed on the outer circumference portion of the control rod, and a connection hole which is formed in the protruding portion and which is connected to the control link (12).
    [0004]
    4. Device for the variable compression ratio mechanism according to claim 3, characterized in that the fixing portion of the control rod (11) is fixed in the hole for fixing the arm connection by a tight fit.
    [0005]
    Device for the variable compression ratio mechanism according to claim 4, characterized in that the control link (12) has a stepped portion formed between a second bearing hole (30b) of the support hole (30) and the fixation ; and the arm connection (13) has a first end portion shaped to be limited in its movement in the axial direction by the stepped portion.
    [0006]
    Device for the variable compression ratio mechanism according to claim 1, characterized in that the control rod (11) is made of a ferrous metal and that a second bearing hole formed in the support hole (30) is an aluminum alloy and the housing comprising the first and second bearing holes (30a, 30b) is aluminum alloy.
    [0007]
    7. Device for the variable compression ratio mechanism according to claim 1, characterized in that the control link (12) has a first end portion which is rotatably connected by a connection pin inserted in a plug hole. connection formed in a second end portion of the arm link.
    [0008]
    Device for the variable compression ratio mechanism according to claim 1, characterized in that the speed reduction device has an internal toothing which has a precise circular shape, which is fully connected to the control rod (11) and which has an inner circumference with inner teeth, an outer toothing which is disposed on the inner circumference side of the internal toothing and which has an outer circumference with outer teeth meshing with the inner teeth, which vary in shape flexibly and whose number is smaller than a number of teeth of the internal toothing, and a wave generating device having an outer circumference which is disposed on and adjacent to the surface of the inner circumference of the outer toothing and shaped to be adjacent at the external toothing on the internal toothing by the rota the engine.
    [0009]
    9. Device for the variable compression ratio mechanism according to claim 1, characterized in that the control rod (11) has a second trunnion portion which is positioned in a position opposite to the end portion to sandwich the fixing portion and having a diameter greater than an outer diameter of the attachment portion.
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    同族专利:
    公开号 | 公开日
    JP2015145647A|2015-08-13|
    US20150219009A1|2015-08-06|
    US20180016975A1|2018-01-18|
    DE102015201807A1|2015-08-06|
    US10883421B2|2021-01-05|
    US9797307B2|2017-10-24|
    FR3017158B1|2019-01-25|
    JP6208589B2|2017-10-04|
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    法律状态:
    2016-01-27| PLFP| Fee payment|Year of fee payment: 2 |
    2017-01-20| PLFP| Fee payment|Year of fee payment: 3 |
    2018-01-10| PLFP| Fee payment|Year of fee payment: 4 |
    2018-02-16| PLSC| Publication of the preliminary search report|Effective date: 20180216 |
    2019-12-30| PLFP| Fee payment|Year of fee payment: 6 |
    2020-12-10| PLFP| Fee payment|Year of fee payment: 7 |
    2021-12-17| PLFP| Fee payment|Year of fee payment: 8 |
    2022-01-28| CD| Change of name or company name|Owner name: HITACHI ASTEMO, LTD., JP Effective date: 20211221 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014018992|2014-02-04|
    JP2014018992A|JP6208589B2|2014-02-04|2014-02-04|Variable compression ratio mechanism actuator and link mechanism actuator|
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