JP5667904B2 - Power transmission device - Google Patents

Description

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

  An example of this type of power transmission device is described in Patent Document 1. The power transmission device described in paragraphs [0019] to [0020] (FIGS. 1, 2, and 4) of the specification of Patent Document 1 transmits engine power to a compressor for a car air conditioner. . This power transmission device connects a pulley to which the power of the engine is transmitted, a hub that is positioned on the same axis as the pulley and is spline-fitted to the rotation shaft of the compressor for the car air conditioner, and the pulley and the hub. And a torque limiter mechanism.

  The rotation transmission member constituting the torque limiter mechanism is formed in a substantially disk shape as a whole by a spring steel plate, and a plurality of connecting piece forming slits are formed at equal intervals in the circumferential direction. An annular main body is formed inside the slit, and a plurality of connecting pieces that are elastically deformable in the axial direction are formed outside the slit.

  The bent part formed on the fixed part side of each connecting piece is bent obliquely so that the inner end of the fold line intersecting the closed end of the slit is the front side in the rotational direction and the outer end of the fold line is the rear side in the rotational direction. Is formed.

  In addition, when the bent portion formed on the connecting portion side of each connecting piece clamps the connecting portion between the driven side rotating member (hub) and the holding plate, each connecting piece is on the driving side rotating member (pulley) side. In some cases, the ring body is bent so that the distance between the annular main body and the connecting portion is substantially the same as the distance between the pulley and the hub (see, for example, Patent Document 2).

JP 2007-107561 A JP 2007-107562 A

  The conventional power transmission device as described above is used as a torque limiter that transmits the driving force of the engine or motor to the rotating shaft of the compressor for the car air conditioner and interrupts transmission of power when an overload occurs on the rotating shaft. The For this reason, if there is a large load fluctuation in the compressor, there is a risk that cracks may occur in the fixed part of the rotation transmission member fixed to the drive side rotation member by the set screw and the closed end of the slit of the rotation transmission member. There is a demand for the development of a power transmission device with excellent performance. In order to prevent the occurrence of such cracks, for example, the mechanical strength of the rotation transmission member may be increased by manufacturing a spring steel plate having a large plate thickness. However, in the rotation transmission member, the bent portion is elastically deformed by fixing the holding plate to the driven side rotating member with a rivet in a state where the connecting portion is sandwiched between the driven side rotating member and the holding plate. The distance between the main body and the connecting portion is substantially the same as the distance between the driving side rotating member and the driven side rotating member. For this reason, when the plate | board thickness dimension of the steel plate for springs becomes large, the clamping force by a driven side rotation member and a clamping board will also change. Therefore, when the driven side rotating member and the clamping plate are overlapped, a design change such as adjusting the clamping force of the connecting portion of the rotation transmitting member by creating a gap of the dimension corresponding to the increased thickness is necessary. There was a problem of becoming.

  The present invention has been made in view of the above-described conventional problems, and its purpose is durability against large load fluctuations on the driven side without requiring adjustment of the clamping force of the connection portion of the rotation transmitting member. It is in providing the power transmission device excellent in.

In order to achieve this object, the present invention provides a driving side rotating member that is rotated 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, and the driven side In a power transmission device comprising a rotation transmission member interposed between a rotation member and the drive side rotation member to connect both the members and to release the connection when an overload is applied to the driven device. The rotation transmitting member is formed in a disc shape, and a plurality of connecting piece forming slits are formed at equal intervals in the circumferential direction so as to surround the annular main body and the outer periphery of the main body. The connecting piece includes a plurality of connecting pieces extending in the main body and elastically deformable in the axial direction, each connecting piece having a fixing portion whose base end side is fixed to the driving side rotating member, and the follower on the tip end side. Separated by the side rotating member and the clamping plate Possible will be clamped has a connecting portion, wherein the connecting members, the radial width of the fixing portion is formed wider than the radial width of the connecting portion, the rotation transmission member, the clamping plate An escape groove that avoids interference with a fixing means that is fixed to the driven side rotating member is provided, and the escape groove is positioned so as to correspond to the connection portion of the connecting piece in the circumferential direction .

The present invention relates to a driving side rotating member that is rotated by 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, the driven side rotating member, and the driving side rotating member. And a rotation transmission member that connects the two members and releases the connection when an overload is applied to the driven device. By forming a plurality of connecting piece forming slits in the circumferential direction at equal intervals in the circumferential direction formed in a plate shape, an annular main body is extended to the main body so as to surround the outer periphery of the main body, and the axial direction Each of the connecting pieces has a fixing portion whose base end side is fixed to the driven side rotating member, and the driving side rotating member and the sandwiching plate on the distal end side. The connecting part that is detachably clamped Fixed, each connecting piece, the radial width of the fixing portion is formed wider than the radial width of the connection portion, to said rotation transmitting member, for fixing the holding plate to the driving side rotational member An escape groove that avoids interference with the means is provided, and the escape groove is positioned so as to correspond to the connecting portion of the connecting piece in the circumferential direction .

  In the invention according to any one of the inventions described above, the curvature of the connecting piece forming slit is formed so as to gradually increase from the connecting portion toward the fixing portion.

According to the present invention, the radial width of the connecting piece is increased from the connecting portion side toward the fixed portion side. For this reason, when an overload occurs on the driven device side, the mechanical strength of the fixed portion of the rotation transmission member to which the load is most applied can be increased. Can be prevented. In addition, since the same thickness is used without changing the thickness of the rotation transmission member, there is no change in the clamping force between the driven rotating member and the clamping plate against the connection. It is not necessary to change the design for this purpose. Furthermore, the outer diameter of the rotation transmitting member is increased even when the radial dimension of the fixed part is increased by making the relief groove correspond to the connection part having the smallest radial dimension of the connecting piece in the circumferential direction. Therefore, the power transmission device does not increase in size.

  According to one of the inventions described above, the curvature of the connecting piece forming slit is formed so as to gradually increase from the connecting portion toward the fixed portion, whereby the radial width W of the connecting piece is set to the connecting portion. Even if it is widened from the side toward the fixed part side, it can be made the same without changing the outer shape of the rotation transmitting member.

It is a front view of the power transmission device concerning the present invention. It is the II-II sectional view taken on the line in FIG. In the power transmission device according to the present invention, it is a rear view of the torque limiter mechanism as viewed from the pulley side. FIG. 4A is a front view of a rotation transmission member in the power transmission device according to the present invention, and FIG. 4B is a cross-sectional view taken along line IV (B) -IV (B) in FIG. In the power transmission device according to the present invention, FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 to 5, a power transmission device 1 according to this embodiment includes a car air conditioner compressor 2 (see FIG. 2) as a driven device that uses the power of an automobile engine (not shown) as a drive device. It is for transmitting to the rotating shaft 3. The power transmission device 1 also includes a torque limiter mechanism 4 for interrupting power transmission when an overload occurs on the rotary shaft 3. In this embodiment, the front end side (right side in FIG. 2) of the rotating shaft 3 is referred to as the front side of the compressor 2, and the opposite side is referred to as the rear side.

  The compressor 2 includes a housing 2a that rotatably supports the rotary shaft 3. A cylindrical portion 2b located on the same axis as the rotation shaft 3 is formed at the front end of the housing 2a. A pulley 6 as a drive side rotation member is rotatably supported by the cylindrical portion 2b by a bearing 5. The pulley 6 is a so-called sheet metal that is formed into a predetermined shape by subjecting a steel plate to plastic working.

  The pulley 6 includes a boss portion 7 that fits into the bearing 5, a disc portion 8 that extends radially outward from the front end portion of the boss portion 7, and a rear portion of the compressor 2 from the outer peripheral portion of the disc portion 8. It is comprised from the rim | limb part 9 extended in the side. That is, the pulley 6 according to this embodiment is formed with an annular groove 10 that opens toward the rear side of the compressor 2. The housing 2a of the compressor 2 is formed so as to cover the opening portion of the annular groove 10 from the rear side.

  As shown in FIG. 2, the disk portion 8 of the pulley 6 has a screw through-hole 12 for inserting a fixing screw 11 described later and a rivet through-hole 14 for inserting a rivet 13 described later. And are drilled. The rim portion 9 is formed with a so-called poly V groove 9a around which a transmission belt (not shown) is wound.

  A hub 15 as a driven side rotating member is attached to the front end portion of the rotating shaft 3 by spline fitting. The hub 15 is fixed to the rotary shaft 3 by fixing bolts 16 and is connected to the pulley 6 via the torque limiter mechanism 4. As shown in FIG. 1, the hub 15 has a disk-like flange portion 15b having three insertion holes 15a. A rivet 17 inserted into each of the insertion holes 15a causes a clamping plate 22 described later to be back. Is attached to the side. Further, on the outer periphery of the flange portion 15b, three clamping portions 15c that clamp a connection portion 21f of the rotation transmission member 21 described later together with the clamping plate 22 are integrally projected in the radial direction at equal intervals in the circumferential direction. .

  As shown in FIG. 2, the torque limiter mechanism 4 includes a rotation transmission member 21 formed of an elastic material fastened to the disk portion 8 of the pulley 6 by a fixing screw 11, and an outer periphery of the rotation transmission member 21. The connecting portion 21f as a sandwiched portion located on the side is constituted by two members, a clamping plate 22 that clamps in cooperation with the hub 15. The sandwiching plate 22 is formed in an annular shape with a hole formed in the center, and is provided with three through holes 22a (see FIG. 2) through which the rivets 17 are inserted. As shown, three holding portions 22b that hold the connection portion 21f of the rotation transmitting member 21 together with the holding portion 15c of the hub 15 are integrally projected in the radial direction at equal intervals in the circumferential direction. The clamping portions 22b are provided with engagement holes 22c that engage with engagement portions 28 described later of the rotation transmission member 21.

  As shown in FIG. 4A, the rotation transmission member 21 is formed in a substantially disc shape as a whole by a spring steel plate, and an insertion hole 21a for inserting the boss portion 15d of the hub 15 is provided in the center portion. In the periphery of the insertion hole 21a, three escape grooves 21b formed in a semicircular shape to avoid interference with the rivet 17 are provided at equal intervals in the circumferential direction. This rotation transmission member 21 is provided with three connecting piece forming slits 24 at equal intervals in the circumferential direction near the outer periphery, thereby surrounding the annular main body 21c positioned inside the slit 24 and the outer periphery of the main body 21c. The three connecting pieces 21 d that are elastically deformable in the axial direction and extended in this manner are interposed between the pulley 6 and the hub 15.

  That is, the connecting piece 21d is formed so as to extend radially outward from the annular main body 21c and to extend in the circumferential direction. Further, these connecting pieces 21d are provided on the outer peripheral portion of the main body 21c so as to be arranged at equal intervals in the circumferential direction. A fixing portion 21e that is fixed to the disc portion 8 of the pulley 6 is provided at the base end portion 25 (the rotation direction side end portion of the rotation transmitting member 21) of the connecting piece 21d, and the distal end portion (the counter rotation direction side) A connecting portion 21f that is detachably held by the hub 15 and the holding plate 22 is provided at the end).

  Further, the connecting piece 21d has a predetermined length on the surface side (hub 15 side) as shown in FIG. 4B along an oblique fold line 26 connecting the inner end P and the outer edge Q of the base end portion 25. It is inclined in a natural state by being bent at an angle γ. As shown in FIG. 4A, the outer edge Q is located on the side opposite to the rotation direction of the rotation transmitting member 21 (the rear side in the rotation direction) with respect to the inner edge P. The inclination angle of the fold line 26, that is, the angle formed between the fold line 26 and the radial straight line L connecting the center O of the rotation transmitting member 21 and the inner end P is set to an angle β. The fold line 26 is illustrated as a linear shape for convenience of explanation and illustration, but it is preferable that the fold line 26 be plastically processed to form a curved curve.

  The fixing portion 21e is a portion that connects the main body 21c and the connecting piece 21d, and is flush with the main body 21c. A mounting hole 27 through which the set screw 11 is inserted is formed in the center of the fixing portion 21e. Then, by using the mounting hole 27, the set screw 11 is screwed into a hex nut 32 held in a nut holding portion 31c of a nut holder 31 to be described later, whereby the fixing portion 21e is fixed to the disc portion 8 of the pulley 6. It is fixed to the front end face and attached to the pulley 6.

  The connecting portion 21f is located in a direction opposite to the rotation direction (arrow direction) of the rotation transmitting member 21 with respect to the fixing portion 21e, and is opposed to the fixing portion 21e on the counter-rotating direction side. Further, as shown in FIG. 4B, the connecting portion 21f is formed to be bent at a required bending angle θ in the direction opposite to the connecting piece 21d (the pulley 6 side). In the center of the back surface of the connecting portion 21f, a hemispherical engaging portion 28 is provided in a projecting manner in order to increase the bonding strength with the holding plate 22. In FIG. 4A, reference numeral 29 denotes a fold line of the connecting portion 21f, and this fold line 21f is a straight line in the radial direction of the rotation transmitting member 21 and coincides with a straight line L1 passing through the inner edge of the connecting portion 21f. ing.

  The feature of the present invention is that the radius of curvature R1 of the portion corresponding to the fixed portion 21e of the connecting piece forming slit 24 of the rotation transmitting member 21 is the curvature of the portion corresponding to the connecting portion 21f of the connecting piece forming slit 24. It exists in the point formed smaller than the radius R2. In other words, the curvatures of the three connecting piece forming slits 24 around the center of curvature O of the rotation transmitting member 21 are formed so as to gradually increase from the connecting portion 21f of the connecting piece 21d toward the fixing portion 21e. . Further, the radial width W of the connecting piece 21d is wider from the connecting portion 21f side toward the fixed portion 21e side. That is, the radial width W1 of the fixed portion 21e of the connecting piece 21d is formed wider than the radial width W2 of the connecting portion 21f. Further, the three escape grooves 21b are positioned so as to correspond (oppose) to the connection portion 21f having the narrowest radial width W of the connecting piece 21d in the circumferential direction. That is, the escape groove 21b is positioned on the line L2 connecting the center of curvature O and the engaging portion 28 of the connecting portion 21f.

  In FIG. 2, reference numeral 31 denotes a nut holder that contacts the disc portion 8 of the pulley 6 and is fixed to the pulley 6 by the rivet 13. The nut holder 31 includes an annular main body 31a, a cylindrical portion 31b extending from the inner peripheral side of the annular main body 31a to the compressor 2 side, and a concave shape formed at a position that divides the circumferential direction of the annular main body 31a into three equal parts. Nut holding portion 31c, a rib portion 31d extending in the circumferential direction so as to connect the adjacent nut holding portions 31c, and the tip of the cylindrical portion 31b to prevent water from entering the bearing 5 A bent portion 31e is provided in which the portion is bent inward. A hex nut 32 is held in the nut holding portion 31 c, and the fixing portion 21 e of the rotation transmission member 21 is fixed to the pulley 6 by the fixing screw 11 screwed into the hex nut 32.

  When assembling the power transmission device 1 having such a structure, a nut holder 31 is incorporated into the annular groove 10 of the pulley 6 and the nut holder 31 is fixed to the pulley 6 by the rivet 13 as shown in FIG. Next, the pulley 6 is rotatably attached to the cylindrical portion 2b of the housing 2a via the bearing 5.

  Next, the hub 15, the holding plate 22 and the rotation transmission member 21 are integrated and attached to the rotating shaft 3. In order to integrate the hub 15, the holding plate 22 and the rotation transmission member 21, the holding plate 22 and the rotation transmission member 21 are overlapped on the back surface of the flange portion 15 b of the hub 15 as shown in FIG. The engaging portions 28 of 21 are engaged with the engaging holes 22 c of the holding plate 22. The rivet 17 is inserted into the insertion hole 15a of the hub 15 and the through hole 22a of the holding plate 22, and the hub 15, the holding plate 22, and the rotation transmission member 21 are integrated, and the holding portion 15c of the hub 15 is integrated. The connecting portion 21 f of the rotation transmitting member 21 is held by the holding portion 22 b of the holding plate 22. When the connecting portion 21 f of the rotation transmitting member 21 is clamped by the hub 15 and the clamping plate 22, it is pressed against the clamping portion 15 c of the hub 15. When the connecting portion 21f is pressed against the holding portion 15c, the connecting piece 21d of the rotation transmitting member 21 is elastically deformed toward the hub 15 to increase the crossing angle with the main body 21c, thereby separating the connecting portion 21f from the main body 21c. As a result, the main body 21c and the connecting portion 21f are in a substantially parallel state as shown in FIG.

  Next, in this state, as shown in FIG. 2, the boss portion 15 d of the hub 15 is splined to the rotating shaft 3 and fixed by the bolt 16. Further, the main body 21c of the rotation transmitting member 21 is displaced toward the compressor 2 by elastic deformation of the connecting piece 21d, and the fixing portion 21e is pressed against the front end surface of the disc portion 8 of the pulley 6. Then, the set screw 11 is inserted through the mounting hole 27 of the rotation transmitting member 21 and the screw through hole 12 of the pulley 6, and is screwed into the hexagon nut 32 held in the nut holding portion 31 c of the nut holder 31, thereby fixing the fixing portion. By fixing 21e to the front end face of the disk portion 8 of the pulley 6, the assembly of the power transmission device 1 is completed.

  Here, the amount of bending of the connecting piece 21d in the plate thickness direction at the time of manufacturing the rotation transmitting member 21 or the bending angle θ between the connecting piece 21d and the connecting portion 21f is adjusted, and the fixed portion is fixed to the disc portion 8 of the pulley 6. When the elastic deformation amount E-D (FIG. 5) of the connecting piece 21d when 21e is fixed is made sufficiently small, preferably D is made equal to E, the reaction force of the rotation transmitting member 21 after assembly is increased. Since it can be made zero, the thrust load on the bearing (not shown) that supports the rotating shaft 3 can also be made zero. E is the distance from the rear surface of the flange portion of the hub 15 to the front end surface of the disk portion 8 of the pulley 6, and D is the distance between the main body 21c and the connection portion 21f when the rotation transmitting member 21 is attached to the hub 15. .

  In the power transmission device 1 having such a structure, the power from the engine is transmitted to the rotary shaft 3 via the pulley 6 -nut holder 31 -nut holding portion 31c -hexagonal nut 32 -rotation transmission member 21 -hub 15. .

  Thus, according to the embodiment of the present invention, the width W in the radial direction of the connecting piece 21d is increased from the connection portion 21f side toward the fixed portion 21e side. For this reason, when the abnormal load fluctuation occurs in the rotating shaft 3, the mechanical strength of the fixed portion 21e of the rotation transmitting member 21 to which the load is applied can be increased, so that the closed end of the slit 24 of the rotation transmitting member 21 Generation of cracks in P can be prevented. In addition, since the same thickness is used without changing the thickness of the rotation transmitting member 21, there is no change in the clamping force between the hub 15 and the clamping plate 22 with respect to the connecting portion 21f. Design changes for adjustment are also unnecessary.

Further, by forming the curvature of the three connecting piece forming slits 24 so as to gradually increase from the connecting portion 21f of the connecting piece 21d toward the fixing portion 21e, the radial width W of the connecting piece 21d is set to the connecting portion. Even if the width is increased from the 21f side toward the fixed portion 21e side, the rotation transmission member 21 can be made the same without changing the outer shape. Further, since the three escape grooves 21b correspond to the connecting portion 21f having the narrowest radial width W of the connecting piece 21d in the circumferential direction, even if the radial width W1 of the fixed portion 21e is widened, the rotation is possible. Since the outer diameter of the transmission member 21 is not increased, the power transmission device 1 is not increased in size.

  In the above-described embodiment, the fixing portion 21e of the rotation transmitting member 21 is fixed to the pulley 6 that is the driving side rotating member, and the connecting portion 21f is detachably connected to the hub 15 that is the driven side rotating member. However, the present invention is not limited to this, and the fixing portion 21e may be fixed to the hub 15 and the connecting portion 21f may be removably coupled to the pulley 6 by the holding plate 22.

  DESCRIPTION OF SYMBOLS 1 ... Power transmission device, 2 ... Compressor for car air conditioner (driven device), 3 ... Rotating shaft, 4 ... Torque limiter mechanism, 6 ... Pulley (drive side rotating member), 15 ... Hub (driven side rotating member), 21 Rotation transmission member 21b Escape groove 21d Connection piece 21e Fixing part 21f Connection part 22 Pinch plate 24 Connection piece forming slit 28 Engagement part 31 Nut holder 32 …nut.

Claims (3)

A driving side rotating member that is rotated by the power of the driving side device, a driven side rotating member of the driven side device to which the rotation of the driving side rotating member is transmitted, and between the driven side rotating member and the driving side rotating member In a power transmission device comprising a rotation transmission member that is interposed and connects these members, and releases the connection when an overload is applied to the driven device,
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 consists of a plurality of connecting pieces extending in the body and elastically deformable in the axial direction,
Each of the connecting pieces has a fixing portion whose base end side is fixed to the driving side rotating member, and has a connecting portion that is detachably clamped by the driven side rotating member and the clamping plate on the distal end side,
Each of the connecting pieces is formed such that a radial width of the fixed portion is wider than a radial width of the connecting portion ,
The rotation transmitting member is provided with a clearance groove that avoids interference with a fixing means that fixes the clamping plate to the driven side rotation member, and the clearance groove is positioned so as to correspond to the connecting portion of the connecting piece in the circumferential direction. A power transmission device characterized by that. A driving side rotating member that is rotated by the power of the driving side device, a driven side rotating member of the driven side device to which the rotation of the driving side rotating member is transmitted, and between the driven side rotating member and the driving side rotating member In a power transmission device comprising a rotation transmission member that is interposed and connects these members, and releases the connection when an overload is applied to the driven device,
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 consists of a plurality of connecting pieces extending in the body and elastically deformable in the axial direction,
Each of the connecting pieces has a fixing portion whose base end side is fixed to the driven side rotating member, and has a connecting portion that is detachably clamped by the driving side rotating member and the clamping plate on the distal end side,
Each of the connecting pieces is formed such that a radial width of the fixed portion is wider than a radial width of the connecting portion ,
The rotation transmission member is provided with a clearance groove that avoids interference with a fixing means that fixes the clamping plate to the driving side rotation member, and the clearance groove is positioned so as to correspond to the connection portion of the connecting piece in the circumferential direction. A power transmission device characterized by that.   3. The power transmission device according to claim 1, wherein a curvature of the connecting piece forming slit is formed so as to gradually increase from the connection portion toward the fixing portion. 4.

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