JP2008190695A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device having improved quality and reliability of the connection/disconnection of power by maintaining the durability of a damper rubber and eliminating the sliding portion between a rotation transmission member and a drive side rotating member to prevent the wear and the lowering of the strength of the rotation transmission member due to sliding during load variation from occurring. <P>SOLUTION: A slipping-off prevention part 43 projects from the inner wall surface of the damper storage part 41 of the annular recessed part of a pulley 4. A flange part 17a in contact with the slipping-off prevention part 43 from the rear side projects from the outer peripheral surface rear end of the connection member 17 of a damper mechanism 9. The connection member 17 and the front end of the damper rubber 16 project forward from the front opening of the pulley 4. The fixing part 8C of a rotation transmitting member 8 is closely fitted to the projected end surface, and fixed with a set screw 10. Consequently, the rotation transmitting member 8 can be held on the pulley 14 in the state of non-contact with each other by the damper mechanism 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power transmission device used for a compressor for a car air conditioner and the like, and in particular, a power transmission device that releases a connection between a driving side rotating member and a driven side rotating member when an overload is applied to a driven device. It is about.

  This type of power transmission device used in a car air conditioner compressor or the like includes a damper mechanism, and is configured to transmit the rotation of the driving side rotating member to the driven side rotating member via the damper mechanism ( For example, refer to Patent Documents 1 to 6).

  An example of a conventional power transmission device will be schematically described with reference to FIG. 8. 2 is a compressor for a car air conditioner (driven device), 3 is a housing of a compressor 2, 4 is a cylindrical portion 3 A of the housing 3 via a bearing 5. A pulley (drive side rotation member) mounted rotatably, 6 is a rotation shaft of the compressor 2, 7 is a hub (drive side rotation member) mounted on the rotation shaft 6, and 8 connects the pulley 4 and the hub 7. A rotation transmission member 9 is a damper mechanism that connects the pulley 4 and the rotation transmission member 8, and constitutes a power transmission device 1 for the compressor 2.

  The rotation transmitting member 8 includes a main body 8A formed in a substantially disc shape, a plurality of elastically deformable connecting pieces 8B extending along the outer periphery of the main body 8A, and base ends of these connecting pieces 8B. And a plurality of fixing portions 8C for connecting the main body 8A to the main body 8A. These fixing portions 8C are fixed to the pulley 4 via the damper mechanism 9 by a set screw 10. The rotation transmitting member 8 is configured such that the pulley 4 and the hub 7 can be brought into and out of contact with each other by the tip portion (connecting portion) 8D of each connecting piece 8B being detachably held by the hub 7 and the holding plate 11. It is connected.

  The damper mechanism 9 is a mechanism for buffering shock and torque fluctuation at the time of power transmission. For example, three damper mechanisms 9 are incorporated in an annular recess 13 provided in the pulley 4 at equal intervals in the circumferential direction. It is composed of a damper rubber 16 and a connecting member 17. The damper rubber 16 is formed in a cylindrical body. The connecting member 17 is formed in a cylindrical body having a flange portion 17a at the rear end, and the damper rubber 16 is fitted on the outer periphery. The fixing portion 8C of the rotation transmitting member 8 is fixed to the front end surface by the set screw 10. Thus, the hub side end surface which is the front end surface of the damper rubber 16 is pressed against the inner surface 18 of the front plate 4a of the pulley 4 by the flange portion 17a.

  In such a power transmission device 1, the power from the automobile engine (drive-side equipment) is transmitted to the rotary shaft 6 via the pulley 4 -damper rubber 16 -connecting member 17 -rotation transmission member 8 -hub 7.

  The damper mechanism 9 effectively buffers the torque fluctuation and shock transmitted from the pulley 4 to the hub 7 by the damper rubber 16 during normal power transmission. Therefore, the tension applied to the connecting portion 8D of the rotation transmitting member 8 due to torque fluctuation or impact during power transmission is reduced, and the connecting portion 8D does not come out from between the hub 7 and the holding plate 11.

  When an overload occurs on the compressor 2 side, the rotation of the rotary shaft 6 is suppressed and a rotational force of a predetermined magnitude or more is generated between the pulley 4 and the hub 7, and the pulley 4 by the rotation transmission member 8 is generated by this rotational force. And the hub 7 are released from the combined state. That is, when the rotation of the rotating shaft 6 is suppressed, the connecting portion 8D of the rotation transmitting member 8 is detached from between the hub 7 and the holding plate 11 by the rotational force generated between the pulley 4 and the hub 7 and the pulley 4 And the hub 7 are released. And connection part 8D moves to the back side of the clamping board 11 by the elastic return of the connection piece 8B. Therefore, after the connection portion 8D is detached, the rotation transmission member 8 and the hub 7 do not interfere with each other, and the rotation transmission of the pulley 4 can be reliably blocked.

Japanese Patent No. 3421619 JP 2003-35321 A JP 2004-245274 A JP 2004-245273 A JP 2003-148510 A JP 2003-28191 A

  However, the above-described conventional power transmission device 1 employs a structure in which the fixing portion 8C of the rotation transmission member 8 is closely fixed to the surface (front surface) 4b of the pulley 4 on the hub 7 side. Accordingly, when the rotation transmission member 8 is twisted and the damper rubber 16 is elastically deformed, there is a problem that the fixing portion 8C of the rotation transmission member 8 is rubbed against the front surface 4b of the pulley 4. When such a phenomenon is repeated over a long period of time, the fixing portion 8C of the rotation transmitting member 8, particularly the peripheral portion of the screw insertion hole 19 through which the set screw 10 provided in the fixing portion 8C is inserted. If worn or deformed, the strength of the fixing portion 8C is reduced, and there is a risk of breakage.

  In order to solve such a problem, in the power transmission device disclosed in the above cited reference 1, the connecting member and the damper rubber are protruded forward of the pulley, and the fixing portion of the rotation transmission member is screwed to the protruding end surface. By fixing, the fixing portion and the pulley 4 are not in contact with each other (14th embodiment, description of paragraphs “0075” to “0079”, FIGS. 40 to 42).

  However, in the power transmission device disclosed as the fourteenth embodiment in the cited document 1, the damper rubber is housed in the rubber housing portion of the rubber holding member, and the damper is formed by the locking portion formed by bending on the front plate of the pulley. Since the structure for locking the rubber is adopted, there is a problem that the production of the pulley and the rubber holding member and the operation of attaching the damper rubber to the pulley are troublesome.

  Further, the damper rubber is repeatedly compressed and deformed between the inner wall of the rubber housing portion of the rubber holding member and the inner surface of the front plate of the pulley due to the elastic restoring force of the rotation transmitting member and the torque fluctuation in the rotation direction. There was a problem with the durability of the cracks.

  The present invention has been made to solve the above-described conventional problems. The object of the present invention is to maintain the durability of the damper rubber and eliminate the sliding portion between the rotation transmitting member and the driving side rotating member. Accordingly, it is an object of the present invention to provide a power transmission device that prevents wear and strength reduction due to sliding of a rotation transmission member when a load fluctuates, and improves quality and reliability with respect to transmission and interruption of power.

  To achieve the above object, the present invention provides a driving side rotating member that is rotated by the power of a driving side device, a driven side rotating member of a driven side device to which the rotation of the driving side rotating member is transmitted, and the driven side rotation. A rotation transmission member that is interposed between a member and the drive side rotation member and connects the two members to release the connection when an overload is applied to the driven device; the rotation transmission member; and the drive A damper mechanism interposed between the plurality of connecting members disposed at equal intervals in the circumferential direction in an annular recess provided in the drive-side rotating member. And a plurality of damper rubbers respectively mounted on the connecting members, and the damper mechanism is inserted in the middle of the inner wall surface of the annular recess of the driving side rotating member. Pull forward from the hole The connecting member has a front end protruding together with the damper rubber from the insertion hole to the front side of the driving side rotating member, and one end of the rotation transmitting member is fixed to the protruding end surface of the connecting member. The rotation transmission member is held in a non-contact state with respect to the drive side rotation member.

  Moreover, this invention has a collar part which the said connection member contact | abuts from the back to the said prevention part.

  Further, according to the present invention, the connecting member has a flange portion at a rear end, the damper rubber is composed of first and second damper rubbers, and the first damper rubber includes the drop prevention portion and the flange portion. The second damper rubber is located between the slip-off prevention part and one end of the rotation transmission member.

  Further, according to the present invention, a groove is formed in the outer periphery of the damper rubber so as to fit the release prevention portion, and the connecting member has an escape prevention uneven portion on the outer periphery to prevent the damper rubber from coming off.

  The present invention also provides a driving side rotating member that rotates by the power of the driving side device, a driven side rotating member of a driven side device to which the rotation of the driving side rotating member is transmitted, the driven side rotating member, and the driving side. A rotation transmission member interposed between the rotation member and connecting the two members to release the connection when an overload is applied to the driven device; and the rotation transmission member and the drive side rotation member. A damper mechanism interposed between the plurality of pins disposed at equal intervals in the circumferential direction in an annular recess provided in the driving side rotation member, and each of the pins is mounted on the pin. A plurality of damper rubbers, and the inner wall of the annular recess of the driving side rotating member prevents the damper mechanism from slipping forward from the insertion hole provided in the front surface of the driving side rotating member. Department provided A groove is formed on the outer periphery of the damper rubber to fit the stopper, and the pin has an uneven portion for preventing the damper rubber on the outer periphery, and the front end is the damper. The rotation transmitting member is held in a non-contact state with respect to the driving side rotating member by protruding to the front side of the driving side rotating member from the insertion hole together with the rubber and being fixed to the rotation transmitting member.

  Further, according to the present invention, the rotation transmission member includes an annular main body, a plurality of fixing portions that protrude from the outer periphery of the main body at equal intervals in the circumferential direction, and are fixed to the damper mechanism. A plurality of connecting pieces that extend along the outer periphery of the main body and are elastically deformed in an axial direction bent in a direction perpendicular to the surface of the main body, and at the tips of the connecting pieces Each of the connecting pieces is extended and connected to the driven side rotating member and the holding plate so as to be detachable, and the base end of the connecting piece has an inner end of the folding line at the front side in the rotational direction and an outer end at the outer end. It is formed to be bent obliquely so as to be on the rear side in the rotational direction.

  Further, in the present invention, the rotation transmission member is formed in a disc shape, and a plurality of connecting piece forming slits are formed at equal intervals in the circumferential direction near the outer periphery. A plurality of connecting pieces that are elastically deformable in the axial direction and extend in the main body so as to surround the outer periphery, and each connecting piece is composed of an inclined piece that is inclined with respect to the surface of the main body. A fixing portion fixed to the damper mechanism is provided on the side, and a connecting portion that is inclined in the direction opposite to the connecting piece and is releasably held by the driven rotation member and the holding plate is provided on the tip side. The connecting portion is formed to be bent on the main body side, and the bending angle of the connecting portion is between the main body and the connecting portion in a state of being sandwiched between the driven side rotating member and the holding plate. The distance between the drive side rotating member and Serial in which is set to be substantially equal to the angle and distance of the driven side rotational member.

  Further, according to the present invention, the fixed portion of the rotation transmitting member is fixed to the driven side rotating member instead of the damper mechanism, and the connecting portion is the damper mechanism and the holding plate instead of the driven side rotating member. It is held so that it can be detached.

  In the present invention, since it is only necessary to provide the inner wall of the annular recess of the drive side rotating member with the prevention of the damper mechanism from falling out of the drive side rotating member, the structure is simple and the power transmission device can be provided at low cost. .

  In addition, since the rotation transmission member and the drive side rotation member are held in a non-contact state by the damper mechanism, the rotation transmission member and the drive side rotation member do not slide when the load fluctuates. The quality and reliability with respect to transmission and interruption of power and the durability of the damper rubber can be improved.

  Further, in the present invention, the connecting piece of the rotation transmitting member is bent so that the bending line is slanted to increase the length of the bending line, so that the stress is distributed along the bending line and the stress concentration is reduced. Therefore, the base end portion of the connecting piece can be cracked or can be prevented from breaking along the fold line.

  Further, in the present invention, in a state where the connection portion of the rotation transmission member is held by the driven side rotation member and the holding plate, the interval between the main body and the connection portion is substantially equal to the interval between the drive side rotation member and the driven side rotation member. Since the bending angle between the connecting piece and the connecting portion is set so that the fixing portion is fixed to the connecting member, there is almost no need to elastically deform the connecting piece, and the bearing and drive side rotation that supports the rotating shaft Since the thrust load applied to the bearing that supports the member is reduced, the rotational resistance of the bearing can be reduced. Further, if the connecting piece is hardly elastically deformed, the rotation transmitting member can be attached to the connecting member with a small operating force, and therefore the work of attaching the rotation transmitting member to the connecting member is facilitated.

  Furthermore, in this invention, since the fixing | fixed part and connection part of a rotation transmission member can be attached reversely, it has the freedom degree of design.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a front view showing a part of a first embodiment of a power transmission device according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a rear view of the power transmission device. 4 (a), (b), (c), and (d) are a front view and a side view of the rotation transmission member, a diagram showing a state in which the rotation transmission member is attached to the hub, and the rotation transmission member as a driving side rotation member. FIGS. 5A and 5B are a front view and a cross-sectional view of the holding plate. It should be noted that the same components and parts as those in the prior art are denoted by the same reference numerals, and description thereof will be omitted as appropriate. The structure of the power transmission device 20 itself is substantially the same as that of the conventional power transmission device 1 described above, and the only difference is the configuration of the damper mechanism 9.

  1 and 2, a pulley 4 that is a drive-side rotating member includes a disc portion 4A that constitutes a front plate, an outer cylindrical portion 4B that protrudes integrally with a rear outer peripheral edge portion of the disc portion 4A, and The inner cylindrical portion 4C is formed, and an annular recess 13 is formed between the disc portion 4A, the outer cylindrical portion 4B, and the inner cylindrical portion 4C. The outer cylindrical portion 4B has a plurality of V-grooves 23 formed on the outer peripheral surface, and the power of the automobile engine is transmitted to the outer cylindrical portion 4B via a V-belt (not shown). On the other hand, the inner cylindrical portion 4 </ b> C is rotatably supported by a protrusion 3 </ b> A provided on the housing 3 of the compressor 2 via a bearing 5.

  One end of the rotating shaft 6 of the compressor 2 protrudes from the protruding portion 3 </ b> A of the housing 3, and the hub 7 is fixed to the protruding end by a bolt 24.

  The hub 7 is integrally provided with a boss portion 7A splined to the shaft end of the rotating shaft 6 and a disk-like flange portion 7B extending outward from the boss portion 7A in the radial direction. The flange portion 7 </ b> B has three insertion holes 26 formed at equal intervals in the circumferential direction, and the holding plate 11 is attached to the back surface side by rivets 25 that are respectively inserted into these insertion holes 26. Further, on the outer periphery of the flange portion 7B, three holding portions 7C that detachably hold the connection portion 8D of the rotation transmitting member 8 together with the holding plate 11 are integrally projected at equal intervals in the circumferential direction.

  2 and 4, the rotation transmission member 8 that is interposed between the pulley 4 and the hub 7 and removably connects these members is generally formed in a substantially disc shape by a spring steel plate or the like. By providing three connecting piece forming slits 30 at equal intervals in the circumferential direction, an annular main body 8A located inside the slit 30 and an axis extending so as to surround the outer periphery of the main body 8A Three connecting pieces 8B that are elastically deformable in the direction (plate thickness direction) are provided. And the base end part (the rotation direction side edge part of the rotation transmission member 8) of each connection piece 8B is connected via the fixing | fixed part 8C to the main body 8A, and the front-end | tip part (counter-rotation direction side edge part) is the said. A connecting portion 8D that is detachably held by the hub 7 and the holding plate 11 is formed.

  Further, as shown in FIG. 4A, the connecting piece 8B is along an oblique bending line 100 that connects the base end 31a of the connecting piece 8B, that is, the inner end P of the boundary with the fixed portion 8C and the outer edge Q. By being bent at a predetermined angle γ on the front surface side (hub 7 side), it is inclined in the natural state shown in FIG. The outer edge Q of the fold line 100 is located on the opposite side (rotational direction rear side) of the rotation transmitting member 8 relative to the inner edge P. The inclination angle of the fold line 100, that is, the angle formed by the fold line 100 and the radial straight line L connecting the center O of the rotation transmitting member 8 and the inner end P is set to an angle β. The fold line 100 is illustrated as being linear for convenience of explanation and illustration, but it is preferable that the fold line 100 be plastically processed to form a curved curve. Moreover, the bending part of the connection piece 8B is two places, the base end 31a of the connection piece 8B, and the boundary part 31b of the connection piece 8B and the connection part 8D.

  The fixing portion 8C is a portion that connects the main body 8A and the connecting piece 8B, and is flush with the main body 8A. A mounting hole 32 through which the set screw 10 is inserted is formed in the center of the fixing portion 8C. The fixing screw 8C is fixed to the front end surface of the connecting member 17 by inserting the set screw 10 into the mounting hole 32 and screwing it into the screw hole 29 formed in the front end surface of the connecting member 17 of the damper mechanism 9. Is done.

  The connecting portion 8D is located in a direction opposite to the rotation direction (arrow direction) of the rotation transmitting member 8 with respect to the fixed portion 8C, and is opposed to the fixed portion 8C on the counter-rotating direction side. Further, as shown in FIG. 4B, the connecting portion 8D is bent at a required angle in the direction opposite to the connecting piece 8B (the pulley 4 side). The fold line 101 of the connecting portion 8D coincides with a straight line L1 (FIG. 4A) that is a straight line in the radial direction of the rotation transmitting member 31 and passes through the inner edge of the connecting portion 8D. In the center of the back surface of the connecting portion 8D, a hemispherical engaging portion 33 is provided in a projecting manner in order to increase the bonding strength with the holding plate 11.

  The connecting portion 8D of each connecting piece 8B is held between the holding portion 7C of the hub 7 and the holding portion 11B of the holding plate 11 by elastic deformation of the connecting piece 8B. For this reason, when the rotation transmitting member 8 is attached to the hub 7, the main body 8A and the connecting portion 8D face each other substantially in parallel as shown in FIGS. 4 (c) and 4 (d). The distance from the back surface, in other words, the distance from the main body 8A to the connecting portion 8D increases to D. This distance D is an effect obtained by sufficiently reducing the bending angle θ between the connecting piece 8B and the connecting portion 8D, and thus the distance D can be made larger than that of a device having a conventional rotation transmission member. This is because the distance D is substantially equal to or slightly smaller than the distance E between the opposed surfaces of the pulley 4 and the hub 7. With such a configuration, the amount of elastic deformation (ED) of the connecting piece 8B when the fixing portion 8C is fixed to the pulley 4 can be reduced. The bending angle θ between the connecting piece 8B and the connecting portion 8D is almost the same as the natural state shown in FIG. 4 (b) and the state attached to the hub 7 shown in FIG. 4 (d).

  In FIG. 5, the holding plate 11 is also formed in a disk shape by a spring steel plate or the like, and is integrally projected on the outer periphery of the ring-shaped main body 11A at equal intervals in the circumferential direction. And three holding portions 11B. Three through holes 34 are formed in the main body 11 </ b> A corresponding to the insertion holes 26 of the hub 7. At the center of each gripping portion 11B, an engagement hole 35 that engages with an engaging portion 33 protruding from the connecting portion 8D of the rotation transmitting member 8 and prevents the connecting portion 8D from being detached in the circumferential direction is provided. .

  2 and 3, the damper mechanism 9 that cushions torque fluctuations and shocks during operation is incorporated in the annular recess 13 of the pulley 4. The annular recess 13 is opened to the rear side of the pulley 4 and the inside thereof is partitioned into six large and small chambers 40 and 41 by a partition wall 13A. The chambers 40 and the chambers 41 are alternately arranged in the circumferential direction of the annular recess 13, and three of the chambers 41 constitute damper storage portions that respectively store the damper mechanisms 9. The damper storage part 41 is also open to the front side of the pulley 4, and the front side opening forms an insertion hole 42. Further, a slip-off preventing portion 43 that prevents the damper mechanism 9 from slipping out to the front side of the pulley 4 is integrally projected from the inner wall surface of each damper storage portion 41 in the intermediate portion in the depth direction. The slip-out preventing portion 43 is configured by an annular projecting body.

  The damper mechanism 9 includes a damper rubber 16 and a connecting member 17. The damper rubber 16 is formed in a cylindrical body having an outer shape substantially the same as that of the damper storage portion 41 and is fitted to the connecting member 17. A front end portion of the damper rubber 16 protrudes forward of the pulley 4 from the insertion hole 42. The fixed portion 8C of the rotation transmitting member 8 is in close contact with the protruding end surface.

  The connecting member 17 is formed in a cylindrical body whose both ends are open, a screw hole 29 into which the set screw 10 is screwed is formed in a front end surface, and a flange portion 17a is integrally formed on the rear end side outer peripheral surface. Projected to The flange portion 17a is formed to have an outer shape larger than the tip portion shape of the drop prevention portion 43, and is prevented from coming out of the pulley 4 from the insertion hole 42 by contacting the drop prevention portion 43 from the rear. . Similarly to the damper rubber 16, the front end portion of the connecting member 17 protrudes forward of the pulley 4 from the insertion hole 42, and the fixing portion 8 </ b> C of the rotation transmission member 8 is in close contact with the protruding end surface and fixed by the set screw 10. Has been. For this reason, the rotation transmission member 8 is held and fixed to the damper mechanism 9 in a non-contact state with respect to the pulley 4. The damper rubber 16 is sandwiched between the fixing portion 8C and the removal preventing portion 43 and compressed in the axial direction, so that the outer peripheral surface is pressed against the inner wall surface of the damper storage portion 41.

  When assembling the power transmission device 20 having such a structure, the damper mechanism 9 is incorporated in the damper accommodating portion 41 of the annular recess 13 of the pulley 4. In assembling, first, the connecting member 17 is assembled into the damper accommodating portion 41 from the rear of the pulley 4, and the flange portion 17 a is brought into contact with the removal preventing portion 43. Next, the damper rubber 16 is fitted into the connecting member 17 from the front side of the pulley 4 and pushed into the damper storage portion 41. As a result, the work of assembling the damper mechanism 9 into the pulley 4 is completed. In this state, the damper rubber 16 and the front end portion of the connecting member 17 protrude a predetermined amount in front of the pulley 4.

  Next, the pulley 4 to which the damper mechanism 9 is attached is rotatably attached to the protruding portion 3 </ b> A of the housing 3 via the bearing 5.

  Next, the hub 7, the rotation transmission member 8 and the holding plate 11 are integrated and attached to the rotating shaft 6. In order to integrate the hub 7, the rotation transmission member 8, and the holding plate 11, the holding plate 11 and the rotation transmission member 8 are overlapped on the back surface of the flange portion 7 </ b> B of the hub 7 to hold the engagement portion 33 of the rotation transmission member 8. Engage with the locking hole 35 of the plate 11. The rivet 25 is inserted into the insertion hole 26 of the hub 7 and the through hole 34 of the holding plate 11 and caulked to integrate the hub 7, the rotation transmitting member 8 and the holding plate 11, and the holding portion 7 C of the hub 7. The connecting portion 8D of the rotation transmitting member 8 is held by the holding portion 11B of the holding plate 11. When the connecting portion 8D of the rotation transmitting member 8 is held by the hub 7 and the holding plate 11, the connecting piece 8B is elastically deformed toward the hub 7 to increase the crossing angle with the main body 8A, and the connecting portion 8D is separated from the main body 8A. Let Thereby, the main body 8A and the connection portion 8D are in a substantially parallel state.

  Next, in this state, the boss portion 7 </ b> A of the hub 7 is splined to the rotating shaft 6 and fixed by the bolt 24. Further, the main body 8A of the rotation transmitting member 8 is displaced to the compressor 2 side by elastic deformation of the connecting piece 8B, and the fixing portion 8C is pressed against the damper rubber 16 and the front end face of the connecting member 17. Then, the assembly of the power transmission device 20 is completed by inserting the set screw 10 into the mounting hole 32 of the fixing portion 8 </ b> C and screwing it into the screw hole 29 of the connecting member 17 and fixing the fixing portion 8 </ b> C to the connecting member 17.

  In such a power transmission device 20, the power from the engine is transmitted to the rotary shaft 6 through the pulley 4 -damper rubber 16 -the coupling member 17 -the rotation transmission member 8 -the hub 7.

  During power transmission, the damper mechanism 9 effectively buffers the torque fluctuation and impact transmitted from the pulley 4 to the hub 7 by the damper rubber 16. Therefore, the tension applied to the connecting portion 8D of the rotation transmitting member 8 due to the impact at the time of power transmission and the torque fluctuation that does not lead to an overload during power transmission is reduced, and the connecting portion 8D is located between the hub 7 and the holding plate 11. There is no way out of it.

  For some reason, for example, when the rotating shaft 6 stops due to an overload applied to the compressor 2, the coupled state between the pulley 4 and the hub 7 by the rotation transmission member 8 is released by the power of the automobile engine. That is, even after the rotation shaft 6 stops, the pulley 4 continues to rotate, so that the rotation transmitting member 8 continues to rotate. For this reason, when the tensile force accompanying rotation overcomes the holding force by the hub 7 and the holding plate 11, the connecting portion 8 </ b> D is detached from between the hub 7 and the holding plate 11 to release the coupling between the pulley 4 and the hub 7. When the engagement between the pulley 4 and the hub 7 is released, the rotation transmitting member 8 returns to the natural state shown in FIG. Move to the side. Therefore, after the connection portion 8D is detached, the rotation transmission of the pulley 4 can be reliably cut off without the rotation transmission member 8 and the hub 7 interfering with each other.

  According to the power transmission device 20 having such a structure, since the fixed portion 8C of the rotation transmission member 8 is held in a non-contact state with respect to the pulley 4 by the damper mechanism 9, the fixed portion 8C is attached to the pulley 4. On the other hand, the sliding portion is not formed, and therefore, there is no possibility that the fixing portion 8C is rubbed and worn when the load fluctuates to reduce the strength or break.

  In addition, the damper rubber 16 is connected between the fixed portion 8C of the rotation transmission member 8 and the pull-out prevention portion 43 of the pulley 4 in a compressed state by the tightening force of the set screw 10, so that the rotation transmission member 8 can be connected. Since there is no compressive deformation due to the elastic restoring force or torque fluctuation of the portion 8B, there is no risk of cracking. Therefore, it is possible to improve the durability of the power transmission device 20 and the reliability with respect to transmission and interruption of power.

  Further, since it is only necessary to project the slip prevention portion 43 on the inner wall of the annular recess 13 of the pulley 4, the structure is simple, there is no need to provide parts made of separate members, and the installation work of the damper mechanism 9 is easy and inexpensive. Can be produced.

  Further, according to the power transmission device 20 according to the present invention, even when a shocking tensile load is applied to the connecting piece 8B of the rotation transmitting member 8 at the time of braking or starting, the base end portion 31a of the connecting piece 8B is cracked. Breaking along the fold line 100 can be prevented. That is, in the present invention, the fold line 100 is an oblique fold line that is inclined by an angle β with respect to a straight line L in the radial direction connecting the center O of the rotation transmitting member 8 and the inner edge P of the connecting piece 8B. The length of the line 100 is long, and the stress generated in the base end portion 31a of the connecting piece 8B can be dispersed along the bending line 100. Therefore, the value of the maximum stress at the inner edge P is reduced, there is no possibility that the inner edge P will be cracked, and the connecting piece 8B will break from here, and the reliability and durability of the power transmission device 20 are improved. Can be made.

  Furthermore, according to the power transmission device 20 according to the present invention, the elastic deformation amount E-D (FIG. 4C) of the connecting piece 8B when the pulley 4 and the hub 7 are connected by the rotation transmitting member 8 is sufficiently small. Since the bending angle θ between the connecting piece 8B and the connecting portion 8D is set as described above, the reaction force of the rotation transmitting member 8 after assembly is small, and a thrust load is applied to a bearing (not shown) that supports the rotating shaft 6. Can be reduced. In addition, this can reduce the rotational resistance of the bearing and further improve the durability and reliability of the power transmission device 20.

FIG. 6 is a sectional view showing a second embodiment of the present invention.
In this embodiment, the damper rubber 16 is composed of first and second damper rubbers 16A and 16B made of a cylindrical body divided in the axial direction. Other configurations are substantially the same as those in the first embodiment.

  The first rubber 16 </ b> A is attached to the rear end portion of the outer peripheral surface of the connecting member 17, and is compressed and incorporated in the axial direction between the flange portion 17 a and the pull-out preventing portion 43 of the pulley 4. The second damper rubber 16 </ b> B is attached to the front end portion of the outer peripheral surface of the connecting member 17, so that the second damper rubber 16 </ b> B is compressed and incorporated in the axial direction between the fixed portion 8 </ b> C of the rotation transmitting member 8 and the removal preventing portion 43. ing.

  The connecting member 17 has a front end portion protruding forward of the pulley 4 together with the second damper rubber 16B, and a fixing portion 8C of the rotation transmitting member 8 is fixed to the protruding end surface by a set screw 10. That is, in this embodiment, by preventing the first damper rubber 16 </ b> A from slipping out to the front side by the slip-off preventing portion 43 provided in the damper housing portion 41 of the annular recess 13 of the pulley 4, Indirectly, the connecting member 17 is prevented from coming off.

The operation of assembling the damper mechanism 9 into the pulley 4 is performed by storing the connecting member 17 on which the first damper rubber 16A is mounted in the damper storage portion 41 from the rear of the pulley 4 and pulling out the front end of the first damper rubber 16A. After that, the second damper rubber 16B is attached to the connecting member 17 from the front side of the pulley 4 so that the rear end is brought into contact with the preventing portion 43, and then the rotation transmission member 8 is fixed. The part 8C is brought into close contact with the connecting member 17 and the front end face of the second damper rubber 16B and fixed with the set screw 10.
Even with such a structure, it will be apparent that the same effects as those of the first embodiment can be obtained.

FIG. 7 is a cross-sectional view showing a third embodiment of the present invention.
In this embodiment, the damper mechanism 9 includes a damper rubber 16 and a connecting pin (connecting member) 120, and the connecting pin 120 is directly caulked and fixed to the fixing portion 8C of the rotation transmitting member 8. .

  The damper rubber 16 is formed in a cylindrical body that is open at the front end side and closed at the rear end side, and a slip prevention portion 43 formed on the inner wall surface of the damper storage portion 41 of the pulley 4 is located near the rear end portion of the outer peripheral surface. An annular groove 121 to be fitted is formed.

  The connecting pin 120 is made of a pin having a different diameter, and includes a pin body 120a having a concavo-convex portion 122, a caulking portion 120b provided at a front end of the pin body 120a and caulked to the fixing portion 8C of the rotation transmitting member 8, It is comprised with the straight cylindrical part 120c provided in the rear end of the main body 120a. The concavo-convex portion 121 of the pin main body 120a is composed of annular projecting bodies and grooves alternately formed in the axial direction on the outer peripheral surface of the pin main body 120a, whereby the damper rubber 16 comes out of the connecting pin 120. Try to prevent.

  The front end portion of the pin body 120a protrudes a predetermined amount in front of the pulley 4 together with the damper rubber 16, and the fixing portion 8C of the rotation transmitting member 8 is brought into close contact with the protruding end surface, and the caulking portion 120b is caulked to fix the fixing portion. 8C is connected to the damper mechanism 9 in a non-contact state with respect to the pulley 4. In addition, it is preferable to form an annular unevenness corresponding to the uneven portion 121 on the inner peripheral surface of the damper rubber 16, but the damper rubber 16 itself can be elastically deformed, and therefore it is not always necessary to provide the unevenness. Absent.

  In the operation of assembling the damper mechanism 9 into the pulley 4, the damper rubber 16 is inserted into the damper storage portion 41 and the removal preventing portion 43 is engaged with the groove 121. The connecting pin 120 is connected in advance to the fixing portion 8c of the rotation transmitting member 8 by caulking the caulking portion 120b. Next, the pulley 4 to which the damper rubber 16 is attached is rotatably attached to the projecting portion 3A of the housing 3 via the bearing 5, and the hub 7, the rotation transmission member 8 and the holding plate 11 are integrally attached to the rotating shaft 6. After that, the connecting pin 120 is press-fitted into the damper rubber 16 from the front of the pulley 4 while elastically deforming the connecting piece 8B of the rotation transmitting member 8. Then, the fixing portion 8 </ b> C of the rotation transmitting member 8 is brought into close contact with the connecting pin 120 and the front end surface of the damper rubber 16.

  In the damper mechanism 9 having such a configuration, since the connecting pin 120 can be directly press-fitted into the damper rubber 16, the connecting member 17 required when the set screw 10 is used can be eliminated. The number of parts can be reduced.

  In the above-described embodiment, an example in which the fixing portion 8C of the rotation transmitting member 8 is fixed to the pulley 4 that is the driving side rotating member, and the connecting portion 8D is removably coupled to the hub 7 that is the driven side rotating member. However, the present invention is not limited to this, and the fixing portion 8C is fixed to the hub 7 and the connecting portion 8D is removably connected to the pulley 4 by the damper mechanism 9 and the holding plate 11. Good.

  In the above-described embodiment, in the state where the rotation transmission member 8 is attached to the hub 7, the distance D (FIG. 4C) from the main body 8 </ b> A to the connecting portion 8 </ b> D is set between the facing surfaces of the pulley 4 and the hub 7. However, the present invention is not limited to this, and the distance D may be slightly larger than the distance E (D> E). In this case, the thrust load applied to the rotary shaft 6 The direction of is opposite to the above embodiment.

It is a front view which fractures | ruptures and shows a part of 1st Embodiment of the power transmission device which concerns on this invention. It is the II-II sectional view taken on the line of FIG. It is a rear view of a power transmission device. (A)-(d) is a front view of a rotation transmission member, a side view, a figure which shows the state attached to the hub, and a figure which shows the state connected with the pulley. (A), (b) is the front view and sectional drawing of a clamping board. It is sectional drawing which shows the 2nd Embodiment of this invention. It is sectional drawing which shows the 3rd Embodiment of this invention. It is sectional drawing of the conventional power transmission device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 ... Power transmission device, 2 ... Compressor, 3 ... Housing, 4 ... Pulley (drive side rotating member), 6 ... Rotating shaft, 7 ... Hub (driven side rotating member), 8 ... Rotation transmitting member, 8A ... Main body 8B: Connecting piece, 8C: Fixing portion, 8D: Connection portion, 9: Damper mechanism, 11: Holding plate, 13: Annular recess, 16 ... Damper rubber, 16A: First rubber, 16B: Second rubber, DESCRIPTION OF SYMBOLS 17 ... Connection member, 17a ... Gutter part, 42 ... Insertion hole, 43 ... Detachment prevention part, 100 ... Bending line, 120 ... Connection pin, 121 ... Groove, 122 ... Uneven part

Claims (7)

A driving side rotating member that rotates by the power of the driving side device;
A driven side rotating member of a driven side device to which the rotation of the driving side rotating member is transmitted;
A rotation transmitting member interposed between the driven side rotating member and the driving side rotating member to connect both the members, and to release the connection when an overload is applied to the driven side device;
A damper mechanism interposed between the rotation transmission member and the drive side rotation member,
The damper mechanism is composed of a plurality of connecting members disposed at equal intervals in the circumferential direction in an annular recess provided in the driving side rotating member, and a plurality of damper rubbers respectively attached to these connecting members. And
The middle part of the inner wall surface of the annular recess of the drive side rotation member is provided with a slip prevention part for preventing the damper mechanism from slipping forward from the insertion hole provided on the front surface of the drive side rotation member.
The connecting member has a front end portion protruding together with the damper rubber from the insertion hole to the front side of the driving side rotating member, and one end portion of the rotation transmitting member is fixed to the protruding end surface by a fixing means. A power transmission device that is held in a non-contact state with respect to the driving side rotation member. The power transmission device according to claim 1,
The power transmission device according to claim 1, wherein the connecting member has a flange portion that comes into contact with the disconnection preventing portion from behind. The power transmission device according to claim 2, wherein
The connecting member has a collar at the rear end,
The damper rubber is composed of first and second damper rubbers,
The first damper rubber is located between the removal preventing portion and the flange portion, and the second damper rubber is located between the removal preventing portion and one end portion of the rotation transmitting member. Power transmission device. The power transmission device according to claim 1,
On the outer periphery of the damper rubber, a groove is formed in which the drop prevention portion is fitted,
The power transmission device according to claim 1, wherein the connecting member has an uneven portion for preventing the damper rubber from coming off the outer periphery. In the power transmission device according to any one of claims 1 to 4,
The rotation transmission member includes an annular main body, a plurality of fixing portions that protrude from the outer periphery of the main body at equal intervals in the circumferential direction and are fixed to the damper mechanism, and the outer periphery of the main body extends from these fixing portions. A plurality of connecting pieces that are elastically deformable in the axial direction and that are bent in a direction perpendicular to the surface of the main body, and the followers are respectively extended at the ends of the connecting pieces. It is composed of a connecting part that is detachably held by a side rotating member and a holding plate,
The power transmission device is characterized in that the base end portion of the connecting piece is formed to be bent obliquely so that the inner end of the fold line is on the front side in the rotational direction and the outer end is on the rear side in the rotational direction. In the power transmission device according to any one of claims 1 to 4,
The rotation transmitting member is formed in a disc shape and is formed with a plurality of connecting piece forming slits at equal intervals in the circumferential direction near the outer periphery, so as to surround the annular main body and the outer periphery of the main body. It is composed of a plurality of connecting pieces that can be elastically deformed in the axial direction extending to the main body,
Each connecting piece is composed of an inclined piece inclined with respect to the surface of the main body, a fixing portion fixed to the damper mechanism is provided on the base end side, and the distal end side is in a direction opposite to the connecting piece. A connecting portion that is inclined and removably held by the driven side rotation member and the holding plate;
The connecting portion is formed to be bent on the main body side, and the bending angle of the connecting portion is such that the interval between the main body and the connecting portion is sandwiched between the driven side rotating member and the holding plate. The power transmission device is characterized in that the angle is set to be substantially equal to the interval between the driving side rotating member and the driven side rotating member. The power transmission device according to claim 5 or 6,
The fixed portion of the rotation transmitting member is fixed to the driven side rotating member instead of the damper mechanism, and the connecting portion is detachably held by the damper mechanism and the holding plate instead of the driven side rotating member. A power transmission device characterized by that.

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