JP2009097712A - Pulley unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley unit preventing rising of a roller caused by a centrifugal force, in a torque limit state wherein a roller is received by a recess part for torque limit. <P>SOLUTION: The pulley unit is assembled between a projected tube part 3 projected to one side of a casing 2 of engine accessories 1 and a rotational shaft 4, and is provided with a pulley 11, a rolling bearing 20, and a one-way clutch 40. The one-way clutch 40 has an inner ring body 42, an outer ring body 41, a cam face 45, the roller 61, and the recess part 46 for torque limit. An annular member 30 is disposed between the outer ring body 41 of the one-way clutch 40 and the pulley 11 to connect them to transmit torque between them. A part of a fitting part between a connecting shaft 5 of the rotational shaft 4 and the inner ring body 42, or the annular member 30 (130, 230) is provided with a displacement absorbing part 80 (180, 280, 580) absorbing decentering between the projected tube part 3 and the rotational shaft 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pulley unit used in an engine auxiliary machine (for example, an air conditioning compressor, an alternator, a water pump, a cooling fan, etc.).

Conventionally, as shown in FIGS. 9 and 10, when the engine accessory of the vehicle-mounted engine is an air-conditioning compressor (hereinafter simply referred to as a compressor), it is integrally projected from one side of the casing 302 of the compressor 301. A pulley unit 310 assembled between the protruding cylindrical portion 303 and the rotating shaft 304 disposed at the center of the protruding cylindrical portion 303 includes a pulley 311, a double row rolling bearing 320, and a one-way clutch 340. The thing of the structure provided is known.
In this case, an outer ring 321, an inner ring 322, and a double row of balls 323 are arranged between the outer peripheral surface of the protruding cylindrical portion 303 and the inner peripheral surface of the cylindrical body 313 integrally fixed to the inner periphery of one end of the pulley 311. , 324 is assembled.
In addition, the one-way clutch 340 is configured so that the outer ring body 341, the inner ring body 342, the outer ring body 342 and the inner ring body 342 are switched between a locked state in which the outer ring body 341 and the inner ring body 342 are synchronously rotated and a free state in which the outer ring body 342 is relatively rotated. A cam surface 345 formed on the surface and forming a plurality of wedge-shaped spaces at predetermined intervals in the circumferential direction in cooperation with the inner peripheral surface of the outer ring body 341, and rollers respectively disposed in the plurality of wedge spaces 361, a coil spring 360 that individually urges these rollers 361 in the locking direction, and a cage 350 that holds the plurality of rollers 361 and the coil spring 360.
Further, the inner ring 342 of the one-way clutch 340 is press-fitted and fixed to the outer peripheral surface of the cylindrical body 313 on the pulley 311 side.
On the other hand, an annular member 330 is fitted on the outer peripheral surface near the end of the rotating shaft 304 so as to be able to transmit torque, and is tightened by a nut 335. The outer ring body 341 of the one-way clutch 340 is coupled to the outer peripheral portion of the annular member 330 so as to transmit torque by an appropriate coupling member.
As a result, the torque of the crankshaft of the in-vehicle engine is transmitted to the pulley 311 via the transmission belt 318. The torque from the pulley 311 side is transmitted to the rotating shaft 304 of the compressor 301 via the one-way clutch 340 and the annular member 330.
In addition, when the rotating shaft 304 of the compressor 301 is locked due to seizure or the like and a torque (load torque) of a predetermined value or more is applied from the pulley 311 to the rotating shaft 304, the cam of the inner ring body 342 is cut off to interrupt torque transmission. A torque limit recess 346 is formed on one side of the surface 345 in the circumferential direction. When a torque of a predetermined value or more acts between the inner ring body 342 on the pulley 311 side and the outer ring body 341 on the rotating shaft 304 side, the roller 361 rolls over one side of the cam surface 345, and is used for torque limit. It is received in the recess 346. As a result, the inner ring body 342 is idled together with the pulley 311, and torque transmission from the pulley 311 side to the rotating shaft 304 is interrupted.
For example, Patent Document 1 discloses a one-way clutch in which a torque limit recess is formed on one side in the circumferential direction of the cam surface of the inner ring body.
JP 2002-106608 A

By the way, in the conventional pulley unit 310 as shown in FIGS. 9 and 10, when the roller 361 is received in the torque limit recess 346 and enters the torque limit state, the inner ring body 342 is idled together with the pulley 311. .
When the inner ring body 342 together with the pulley 311 is in an idling state, the roller 361 may be lifted from the torque limit recess 346 by centrifugal force, and may be inadvertently caught between the inner ring body 342 and the outer ring body 341 and become locked. is there.

  In view of the above problems, an object of the present invention is to provide a pulley unit that can prevent the roller from being lifted by centrifugal force when the roller is received in the torque limit recess and is in the torque limit state. is there.

In order to achieve the above object, a pulley unit according to claim 1 of the present invention includes a projecting cylinder portion projecting to one side of a casing of an engine accessory, and a rotating shaft disposed at a central portion of the projecting cylinder portion. A pulley unit comprising a pulley, a rolling bearing, and a one-way clutch,
The rolling bearing is disposed between the outer peripheral surface of the protruding cylindrical portion and the inner peripheral side of the pulley,
The one-way clutch includes an inner ring body that is fitted to a connecting shaft portion formed at a distal end portion of the rotating shaft so as to transmit torque.
An outer ring body provided concentrically on the outer periphery of the inner ring body;
In order to switch between a locked state in which the inner ring body and the outer ring body are rotated synchronously and a free state in which the inner ring body and the outer ring body are rotated relative to each other, a plurality of inner ring bodies are formed in cooperation with the inner circumferential surface of the outer ring body. A cam surface that forms a wedge-shaped space at a predetermined interval in the circumferential direction;
Rollers respectively disposed in the plurality of wedge spaces;
The outer ring body and the inner ring body are provided on one side in the circumferential direction of the cam surface of the inner ring body and receive the roller that rolls over the cam surface when a torque greater than a predetermined value is applied. A torque limit recess for interrupting torque transmission with
An annular member is provided between the outer ring body of the one-way clutch and the pulley so as to connect both of them so that torque can be transmitted.
A fitting portion between the connecting shaft portion of the rotating shaft and the inner ring body, or a part of the annular member, is provided with a misalignment absorbing portion that absorbs misalignment between the protruding cylindrical portion and the rotating shaft. It is characterized by.

According to the above configuration, when the rotating shaft of the engine auxiliary machine is locked due to seizure or the like and a torque of a predetermined value or more acts between the outer ring body on the pulley side and the inner ring body on the rotating shaft side of the engine auxiliary machine, the roller Gets over one side of the cam surface of the inner ring body and is received in the torque limit recess. As a result, the outer ring body is idled together with the pulley, and torque transmission from the pulley side to the rotating shaft is interrupted.
At this time, the inner ring body is in a stationary state together with the rotating shaft in the locked state. For this reason, the roller received in the recess for torque limit of the inner ring body does not receive the action of centrifugal force.
As a result, it is possible to prevent the roller from being lifted from the torque limit recess, and it is possible to suppress a problem that the roller unexpectedly bites between the inner ring body and the outer ring body.
Further, when there is a misalignment (center misalignment) between the protruding cylinder portion of the engine accessory and the rotation shaft, this misalignment is absorbed by the misalignment absorbing portion.
For this reason, the malfunction by the misalignment between a protrusion cylinder part and a rotating shaft can be prevented.
For example, if a misalignment occurs between the protruding cylinder and the rotating shaft, the inner ring body and the outer ring body of the one-way clutch may be misaligned with the misalignment. Then, since the meshing state of the plurality of wedge spaces and the rollers changes unlike the set state, there is a possibility that the function as the one-way clutch cannot be performed. The center misalignment absorbing portion absorbs the misalignment between the plurality of wedge spaces and each roller, so that the meshing state between the rollers can be maintained, and the function as a one-way clutch can be sufficiently achieved. it can.

The pulley unit according to claim 2 is the pulley unit according to claim 1,
An external spline is formed on the outer peripheral surface of the connecting shaft portion of the rotary shaft, while an internal spline is formed on the inner peripheral surface of the inner ring body so as to be able to transmit torque to the external spline.
A gap misalignment portion between the inner and outer splines is used as a misalignment absorbing portion.

  According to the above configuration, the number of parts and the number of assembling steps are not increased by using the misalignment absorbing portion as the gap portion between the inner and outer splines of the connecting shaft portion of the rotating shaft and the inner ring body. Great effect in terms of cost.

The pulley unit according to claim 3 is the pulley unit according to claim 1,
An annular elastic body having an annular shape along the circumferential direction of the annular member is interposed between a part between the inner diameter end and the outer diameter end of the annular member,
The elastic deformation portion of the annular elastic body is a misalignment absorbing portion.

  According to the above configuration, the elastic deformation portion of the annular elastic body interposed between the inner diameter end and the outer diameter end of the annular member that connects the outer ring body of the one-way clutch and the pulley so as to be able to transmit torque is the misalignment absorbing section. By doing so, the misalignment between the protruding cylindrical portion and the rotating shaft can be absorbed well.

The pulley unit according to claim 4 is the pulley unit according to claim 1,
In the annular space between the outer peripheral surface of the connecting shaft portion of the rotating shaft and the inner peripheral surface of the inner ring body, an elastically deformable cylindrical elastic body is interposed,
The elastic body is a misalignment absorbing portion.

  According to the above configuration, the protruding cylindrical portion is formed by using the cylindrical elastic body interposed in the annular space between the outer peripheral surface of the connecting shaft portion of the rotating shaft and the inner peripheral surface of the inner ring body as the misalignment absorbing portion. And misalignment between the rotating shaft and the rotating shaft can be satisfactorily absorbed. Furthermore, the misalignment absorbability is excellent as compared with the case where the gap portion of the meshing of the inner and outer splines is a misalignment absorbing portion.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

Example 1
A first embodiment of the present invention will be described with reference to FIGS.
1 is a side sectional view showing a compressor including a pulley unit according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing the one-way clutch of the pulley unit. FIG. 3 is an enlarged plan view showing a state where a roller and a coil spring are housed in a pocket of a cage of a one-way clutch. FIG. 4 is an enlarged cross-sectional view showing a state where a roller and a coil spring are housed in a pocket of a cage of a one-way clutch. FIG. 5 is an explanatory view showing a state in which the roller of the one-way clutch is received in the recess for torque limit.

  As shown in FIG. 1, the pulley unit 10 according to the first embodiment exemplifies a case where the pulley unit 10 is used in a compressor 1 that is one of engine auxiliary machines of an in-vehicle engine, and a casing 2 of the compressor 1. And a pulley 11 which is assembled between a projecting cylinder portion 3 integrally projecting from one side of the shaft and a rotating shaft 4 of the compressor 1 which is rotatably assembled to the center portion of the projecting cylinder portion 3. The double row rolling bearing 20, the one-way clutch 40, and the annular member 30 are provided.

  The pulley 11 is formed in a cylindrical shape concentrically disposed on the outer periphery of the protruding cylinder portion 3, and a belt groove 12 having a corrugated cross section on which the transmission belt 18 is stretched is formed on the outer peripheral surface of the pulley 11. . The transmission belt 18 is stretched around the pulley of the crankshaft of the vehicle-mounted engine, and transmits the torque of the crankshaft to the pulley 11.

The double row rolling bearing 20 is arranged to be able to roll in a double row in a state where it is held by the outer ring 21, the inner ring 22, and the retainers 25 and 26 between the outer ring 21 and the inner ring 22, respectively. A plurality of balls 23 and 24 are provided.
The inner ring 22 of the double row rolling bearing 20 is press-fitted and fixed to the protruding cylindrical portion 3 on the compressor 1 side and is prevented from coming off by the retaining ring 8. The outer ring 21 is press-fitted and fixed to the inner peripheral surface of the cylindrical body 13 formed on the inner peripheral side of the pulley 11.

As shown in FIGS. 1 and 2, the one-way clutch 40 includes an outer ring body 41, an inner ring body 42, a plurality of rollers 61, a coil spring 60, and a cage 50. In the one-way clutch 40, the inner ring body 42 is fitted to the connecting shaft part 5 at the tip of the rotating shaft 4 of the compressor 1 so that torque can be transmitted, and the outer ring 21 is connected to the pulley 11 via the annular member 30. Has been.
As shown in FIGS. 2 and 4, a plurality of (six in FIG. 2) wedge-shaped spaces are provided in the circumferential direction between the outer circumferential surface of the outer ring body 41 and the inner ring body 42 of the one-way clutch 40. Cam surfaces (flat surfaces or curved surfaces) 45 for being formed apart are formed at predetermined intervals in the circumferential direction of the outer peripheral surface of the inner ring body 42, while the inner peripheral surface of the outer ring body 41 is circular. In the plurality of wedge spaces, the same number of rollers 61 and coil springs 60 that individually bias these rollers 61 in the locking direction (the narrow side of the wedge space) are accommodated in the respective pockets 51 of the cage 50. Each is arranged in the state.

As shown in FIG. 4, a torque limit recess 46 such as a concave arc shape or a concave curve shape is formed with a required depth on one circumferential side of each cam surface 45 of the inner ring body 42.
When the rotary shaft 4 of the compressor 1 is locked by seizure or the like, and a torque (load torque) of a predetermined value or more is applied from the outer ring body 41 on the pulley 11 side to the inner ring body 42 on the rotary shaft 4 side, FIG. As shown, the roller 61 rolls over the cam surface 45 and is received in the torque limit recess 46, so that the roller 61 cannot be engaged between the outer ring body 41 and the inner ring body 42. Torque transmission between the outer ring body 41 on the pulley 11 side and the inner ring body 42 on the rotating shaft 4 side is cut off.

Further, the cage 50 of the one-way clutch 40 is integrally formed into a cylindrical shape by injection molding of a synthetic resin material, and a plurality of pockets 51 and column portions 52 that partition these pockets 51 are alternately arranged in the circumferential direction. Is formed. The cage 50 is fitted to the outer peripheral surface of the inner ring body 42.
A protrusion 53 into which the proximal winding portion of the coil spring 45 is inserted is provided on one side surface (a surface facing the narrow side of the wedge space) of both side wall surfaces of each pillar portion 52 of the cage 50. Yes. In addition, on the other side of the column 52 of the cage 50 that faces the roller 61, when the roller 61 is received in the torque limit recess 46, the roller 61 is clamped in cooperation with the torque limit recess 46. It is desirable to form a roller holding portion 55 that holds the shape. Furthermore, the roller holding part 55 is more preferably formed in an arc shape along the outer peripheral surface of the roller 61.
In the first embodiment, the reaction force of the coil spring 60 is received between the outer peripheral surface of the inner ring body 42 and the inner peripheral surface of the cage 50 while preventing the cage 50 from rotating in the free direction. An engagement portion (not shown) is provided that allows the retainer 50 to rotate in the locking direction in accordance with the displacement angle of the roller 61 when it is disposed in the torque limit recess 46 from the cam surface 45. ing.

The coil spring 60 is formed by winding a spring wire into an elliptical shape, a rectangular shape or the like, and the base end winding portion of the coil spring 60 is fitted into the projection 53 with the base portion of the projection 53 of the column portion 52 as a spring seat. In this state, the tip winding portion is in contact with the outer peripheral surface of the roller 61. The coil spring 60 elastically urges the roller 61 toward the narrow side of the wedge-shaped space (the side in the locked state).
Note that engaging portions (not shown) that engage with each other and receive a reaction force of the coil spring 60 are formed on the inner peripheral surface of the cage 50 and the outer peripheral surface of the inner ring body 42.

Further, in the first embodiment, as shown in FIG. 1, a rolling bearing 70 is located on one side of the cage 50 in the annular space between the outer ring body 41 and the inner ring body 42 of the one-way clutch 40. A plurality of balls 71 that are configured are arranged so as to be able to roll while being held by a holder 72.
When the roller 61 is disposed in the torque limit recess 46, the outer ring body 41 and the inner ring body 42 are concentrically held by the rolling bearing 70.

  As shown in FIG. 1, the annular member 30 connects the outer ring body 41 of the one-way clutch 40 and the pulley unit 10, and a cylindrical boss portion into which the outer ring body 41 of the one-way clutch 40 is press-fitted and fixed. 31 and a flange portion 32 extending integrally from the outer peripheral surface of one end of the boss portion 31. In the state where the outer ring body 41 is press-fitted and fixed to the boss portion 31, the set screw 33 passes through the outer peripheral portion of the flange portion 32 and is screwed into one end surface of the pulley 11, whereby the outer ring body 41 of the one-way clutch 40. And the pulley unit 10 are connected.

As described above, the pulley 11 is assembled to the outer peripheral surface of the protruding cylindrical portion 3 via the rolling bearing 20, and the outer ring body 41 of the one-way clutch 40 assembled to the connecting shaft portion 5 of the rotating shaft 4 is connected to the pulley by the annular member 30. 11, when a misalignment (center misalignment) occurs between the projecting cylindrical portion 3 and the rotating shaft 4, the inner ring body 42 and the outer ring body 41 of the one-way clutch 40 accompany this misalignment. May be misaligned.
In order to absorb the misalignment, a misalignment absorbing portion 80 is provided at a fitting portion between the connecting shaft portion 5 of the rotating shaft 4 and the inner ring body 42 of the one-way clutch 40 or a part of the annular member 30. .
In the first embodiment, external splines 6 are formed on the outer peripheral surface of the connecting shaft portion 5 of the rotary shaft 4, while torque can be transmitted to the outer splines 6 on the inner peripheral surface of the inner ring body 42 of the one-way clutch 40. An internal spline 43 to be fitted is formed. A gap portion where the external spline 6 and the internal spline 43 are engaged is defined as a misalignment absorbing portion 80.

The pulley unit 10 used in the compressor 1 as an engine accessory according to the first embodiment is configured as described above.
Therefore, when the torque of the crankshaft is transmitted to the pulley 11 by the transmission belt 18 during the operation of the in-vehicle engine, the outer ring body 41 of the one-way clutch 40 is rotated together with the pulley 11. The torque of the outer ring body 41 is transmitted to the inner ring body 42 and the rotating shaft 4 of the compressor 1 by the roller 61, and the rotating shaft 4 is rotated.
That is, when the on-board engine is operated, when the rotation speed of the pulley 11 is higher than the rotation speed of the rotation shaft 4, the one-way clutch 40 is locked, so that the rotation shaft 4 rotates together with the pulley 11.
Further, when the rotation speed of the pulley 11 becomes slower than the rotation speed of the rotating shaft 4, the roller 61 of the one-way clutch 40 moves out of the lock position and moves to the wider side of the wedge-shaped space to switch to the free state. Thereby, the rotation fluctuation of the pulley 11 is absorbed.

When seizure or the like occurs on the rotating shaft 4 of the compressor 1 and the rotating shaft 4 is locked, a torque (load torque) of a predetermined value or more acts between the outer ring body 41 and the inner ring body 42.
In this case, as shown in FIG. 5, the roller 61 rolls over one side of the cam surface 45 and is received in the torque limit recess 46. When the roller 61 is received in the torque limit recess 46, the pulley 11 is idled together with the outer ring body 41, and torque transmission from the pulley 11 side to the rotating shaft 4 is interrupted.
At this time, the inner ring body 42 is in a stationary state together with the rotating shaft 4 in the locked state. For this reason, the roller 61 received in the torque limit recess 46 of the inner ring body 42 is not affected by the centrifugal force.
As a result, it is possible to prevent the roller 61 from floating from the torque limit recess 46 on the outer peripheral surface of the inner ring body 42, and to suppress the problem that the roller 61 bites between the inner ring body 42 and the outer ring body 41 unexpectedly. Can do.

Further, in the first embodiment, as shown in FIG. 5, when the roller 61 is received in the torque limit recess 46 and the pulley 11 is idled together with the outer ring body 41, the torque limit recess 46 and the holding The roller 61 can be held in a sandwiched manner by cooperation with the roller holding portion 55 of the column portion 52 of the container 50.
For this reason, it is possible to prevent the roller 61 from floating or rattling from the torque limit recess 46 due to vibration or the like during vehicle travel. As a result, it is possible to prevent the roller 61 from accidentally biting between the inner ring body 42 and the outer ring body 41, and to keep the pulley 11 in the idling state together with the outer ring body 41.

Further, when there is a misalignment (center misalignment) between the protruding cylindrical portion 3 of the compressor 1 and the rotating shaft 4, this misalignment is caused by the misalignment absorbing portion 80, that is, outside the connecting shaft portion 5 of the rotating shaft 4. The tooth spline 6 is absorbed in a gap portion where the tooth spline 6 meshes with the inner tooth spline 43 of the inner ring body 42 of the one-way clutch 40.
For this reason, the engagement state between the plurality of wedge spaces between the outer ring body 41 and the inner ring body 42 of the one-way clutch 40 and the respective rollers 61 can be maintained, and the function as the one-way clutch is sufficient. Can fulfill.

In the first embodiment, the misalignment absorbing portion 80 that absorbs misalignment between the projecting cylindrical portion 3 of the compressor 1 and the rotating shaft 4 includes the external spline 6 of the connecting shaft portion 5 of the rotating shaft 4. And a case where the inner ring body 42 of the one-way clutch 40 is configured by a gap portion that meshes with the internal spline 43. As shown in FIG. A body 130a, an outer diameter body 130b, and an annular elastic body 130c made of an elastic body such as rubber that integrally connects the outer peripheral portion of the inner diameter body 130a and the inner peripheral portion of the outer diameter body 130b. The present invention can also be implemented by using the elastic deformation portion of the annular elastic body 130c as the misalignment absorbing portion 180.
Further, as shown in FIG. 7, the annular member 230 is divided into an inner diameter body 230a, an outer diameter body 230b, and an outer peripheral surface of the inner diameter body 230a and an inner peripheral surface of the outer diameter body 230b. It is possible to implement the present invention by using an annular elastic body 230c made of an elastic body such as rubber interposed between the annular clearances and connecting the both, and the elastic deformation portion of the annular elastic body 230c is used as the misalignment absorbing portion 280. it can.
As shown in FIGS. 6 and 7, when the annular elastic body 130c (or 230c) is interposed between the inner diameter end and the outer diameter end of the annular member 130 (or 230), the rotating shaft 4 The inner ring body 42 of the one-way clutch 40 may be fixed to the connecting shaft portion 5 by tightening with a screw.
In this case, for example, a male screw 5a is formed on the outer peripheral surface of the connecting shaft portion 5 of the rotary shaft 4 of the compressor 1, while a female screw corresponding to the male screw is formed on the inner peripheral surface of the inner ring body 42 of the one-way clutch 40, and a tightening tool. And a recess corresponding to.

  Further, in the first embodiment, the case where the arc-shaped roller holding portion 55 along the outer peripheral surface of the roller 61 is formed on the other side surface of the column portion 52 of the cage 50 is illustrated. The present invention can be implemented even if the portion 55 is not necessarily provided.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a side sectional view showing a compressor provided with a pulley unit according to Embodiment 2 of the present invention.
As shown in FIG. 8, also in the second embodiment, the pulley unit 510 includes a protruding cylindrical portion 503 that integrally protrudes from one side of the casing 502 of the compressor 501, in the same manner as in the first embodiment. The pulley 511, the double row rolling bearing 520, the one-way clutch 540, and the annular shape are assembled across the rotation shaft 504 of the compressor 501 that is rotatably assembled to the central portion of the protruding cylinder portion 503. A member 530.
In particular, in the second embodiment, an annular space is formed between the outer peripheral surface of the connecting shaft portion 505 at the tip of the rotating shaft 504 and the inner peripheral surface of the inner ring body 542, and synthetic resin, rubber, etc. are formed in this annular space. An elastically deformable cylindrical elastic body 580a is interposed in an appropriately elastically compressed state. The elastic body 580a is used as the misalignment absorbing portion 580.
Further, torque is transmitted between the connecting shaft portion 505 and the inner ring body 542 by the frictional force of the contact portion between the outer peripheral surface of the connecting shaft portion 505 and the inner peripheral surface of the inner ring body 542 and the elastic body 580.
Since other configurations of the second embodiment are configured in the same manner as the first embodiment, the description thereof is omitted.

Therefore, also in the second embodiment, as described in the first embodiment, when the rotary shaft 504 of the compressor 501 is seized and the rotary shaft 504 is locked, the outer ring body 541 and the inner ring body 542 During this time, a torque (load torque) of a predetermined value or more acts.
In this case, the roller 561 of the one-way clutch 540 rolls over one side of the cam surface and is received in a torque limit recess (not shown), whereby the pulley 511 is idled together with the outer ring body 541. Torque transmission from the 511 side to the rotating shaft 504 is interrupted.
At this time, since the inner ring body 542 is in a stationary state together with the rotating shaft 504 in the locked state, the roller 561 received in the torque limit recess of the inner ring body 542 is not affected by centrifugal force.
As a result, it is possible to prevent the roller 561 from floating from the torque limit recess on the outer peripheral surface of the inner ring body 542, and to prevent the roller 561 from accidentally biting between the inner ring body 542 and the outer ring body 541. it can.

When there is a misalignment (center misalignment) between the projecting cylindrical portion 503 of the compressor 501 and the rotating shaft 504, this misalignment causes elastic expansion (expansion) deformation and diameter reduction by the cylindrical elastic body 580a. It can be absorbed well by (compression) deformation.
Therefore, the meshing state between the rollers and the plurality of wedge spaces between the outer ring body 541 and the inner ring body 542 of the one-way clutch 540 and each roller can be maintained, and the function as the one-way clutch is sufficiently achieved. be able to.
Further, compared with the case where the gap portion of the meshing between the inner and outer splines 6 and 43 described in the first embodiment is used as the misalignment absorbing portion, the elastic expansion deformation and contraction deformation of the cylindrical elastic body 580a. Therefore, the center misalignment is excellent.

The present invention is not limited to the first and second embodiments.
For example, in the first and second embodiments, the case where the pulley unit is employed in a compressor as an engine auxiliary machine is illustrated, but a pulley unit corresponding to an engine auxiliary machine such as an alternator, a water pump, and a cooling fan. Can be used as

It is a sectional side view which shows the compressor provided with the pulley unit which concerns on Example 1 of this invention. It is a cross-sectional view which similarly shows the one-way clutch of a pulley unit. It is a top view which expands and shows the state in which the roller and the coil spring were similarly accommodated in the pocket of the holder | retainer of a one-way clutch. It is a cross-sectional view which expands and shows the state in which the roller and the coil spring were similarly accommodated in the pocket of the cage | basket of a one-way clutch. Similarly, it is explanatory drawing which shows the state in which the roller of the one-way clutch was received in the recessed part for torque limits. It is sectional drawing which shows the embodiment which comprised the misalignment absorption part by interposing the cyclic | annular elastic body in the overlapping part of the internal diameter body and outer diameter body which comprise an annular member. FIG. 6 is a cross-sectional view showing an embodiment in which a misalignment absorbing portion is configured by interposing an annular elastic body in an annular gap between an inner diameter body and an outer diameter body constituting an annular member. It is a sectional side view which shows the compressor provided with the pulley unit which concerns on Example 2 of this invention. It is a sectional side view which shows the compressor provided with the conventional pulley unit. It is a cross-sectional view which similarly shows the one-way clutch of a pulley unit.

Explanation of symbols

1,501 Compressor (Engine accessory)
2,502 Casing 3,503 Projecting cylinder 4,504 Rotating shaft 5,505 Connection shaft 6 External spline (core misalignment absorbing portion)
10, 510 Pulley unit 11, 511 Pulley 20, 520 Rolling bearing 30, 130, 230, 530 Annular member 40, 540 One-way clutch 41, 541 Outer ring body 42, 542 Inner ring body 43 Internal spline (core misalignment absorbing portion)
45 Cam surface 46 Recessed portion for torque limit 61 Roller 80, 180, 280, 580 Center misalignment absorbing portion 580a Cylindrical elastic body

Claims (4)

It is assembled between a projecting cylinder part projecting to one side of the casing of the engine accessory and a rotating shaft arranged at the center of the projecting cylinder part, and includes a pulley, a rolling bearing, and a one-way clutch. Pulley unit,
The rolling bearing is disposed between the outer peripheral surface of the protruding cylindrical portion and the inner peripheral side of the pulley,
The one-way clutch includes an inner ring body that is fitted to a connecting shaft portion formed at a distal end portion of the rotating shaft so as to transmit torque.
An outer ring body provided concentrically on the outer periphery of the inner ring body;
In order to switch between a locked state in which the inner ring body and the outer ring body are rotated synchronously and a free state in which the inner ring body and the outer ring body are rotated relative to each other, a plurality of inner ring bodies are formed in cooperation with the inner circumferential surface of the outer ring body. A cam surface that forms a wedge-shaped space at a predetermined interval in the circumferential direction;
Rollers respectively disposed in the plurality of wedge spaces;
The outer ring body and the inner ring body are provided on one side in the circumferential direction of the cam surface of the inner ring body and receive the roller that rolls over the cam surface when a torque greater than a predetermined value is applied. A torque limit recess for interrupting torque transmission with
An annular member is provided between the outer ring body of the one-way clutch and the pulley to connect both of them.
A fitting portion between the connecting shaft portion of the rotating shaft and the inner ring body, or a part of the annular member, is provided with a misalignment absorbing portion that absorbs misalignment between the protruding cylindrical portion and the rotating shaft. Pulley unit characterized by The pulley unit according to claim 1,
An external spline is formed on the outer peripheral surface of the connecting shaft portion of the rotary shaft, while an internal spline is formed on the inner peripheral surface of the inner ring body so as to be able to transmit torque to the external spline.
A pulley unit characterized in that a gap portion of meshing of the inner and outer teeth splines is used as a misalignment absorbing portion. The pulley unit according to claim 1,
An annular elastic body having an annular shape along the circumferential direction of the annular member is interposed between a part between the inner diameter end and the outer diameter end of the annular member,
A pulley unit characterized in that an elastic deformation portion of the annular elastic body is a misalignment absorbing portion. The pulley unit according to claim 1,
In the annular space between the outer peripheral surface of the connecting shaft portion of the rotating shaft and the inner peripheral surface of the inner ring body, an elastically deformable cylindrical elastic body is interposed,
A pulley unit characterized in that the elastic body is a misalignment absorbing portion.

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