JP2006226358A - One-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch easy to build in a spring and improving productivity. <P>SOLUTION: A retainer 21 of the one-way clutch 10 includes a pair of annular parts 23, a plurality of bridge parts 24 connecting a pair of the annular parts 23, and a center column part 26 extending radially outward from an axial direction center part of the bridge parts 24 and retaining the spring 22, and height of a part of the center column part 26 abutting on the spring 22 is lower than height of the spring 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a one-way clutch, and more particularly, to a pulley apparatus used by being fixed to an end of a rotating shaft such as an alternator, a compressor, or a starter motor constituting an automobile starter, which is an auxiliary machine for an automobile. The present invention relates to a built-in one-way clutch.

  Conventionally, in a pulley device for driving an auxiliary machine such as an alternator, a one-way clutch is used for belt protection due to the influence of fluctuations in rotational angular velocity of an engine or acceleration / deceleration during traveling (for example, Patent Documents). 1). For example, as shown in FIG. 7, the one-way clutch 100 built in the pulley device is provided in a wedge space formed between the outer peripheral surface of the inner ring 101 and the inner peripheral surface of the outer ring 102 as the ramp surface 101 a. The rollers 103 are arranged, and the rollers 103 are engaged and disengaged by the relative rotation of the inner and outer rings 101 and 102, thereby transmitting and blocking power from the drive source.

Further, as shown in FIGS. 7 and 8, the rollers 103 are respectively accommodated in a plurality of pockets 105 provided in the cage 104, and the wedge space is narrowed by the springs 106 supported by the cage 104. That is, it is elastically pressed in the locking direction. The cage 104 includes a pair of annular portions 107 provided at both ends in the axial direction, and a bridge portion 108 that connects the pair of annular portions 107. Both end column portions 109 and a central column portion 110 projecting radially outward are provided at both axial end portions and an axial intermediate portion of the bridge portion 108, and the spring 106 includes both the end column portions 109, the central column portions 110, It is fixed by. Further, an upper end portion of the central column portion 110 is provided with a retaining portion 111 that prevents the spring 106 from coming off due to centrifugal force.
JP 2000-240688 A

  By the way, in the one-way clutch 100 configured as described above, the side surfaces of the central column portion 109 and both end column portions 110 that are in contact with the spring 106 are located on the same plane, and the spring 106 is disposed on the center column portion 109 and the both end column portions 110. The thickness of the spring 106 acts as a tightening margin. Further, a stopper 111 is formed at the upper end of the central pillar 110. For this reason, it is necessary to insert the spring 106 into the central column portion 109 and the both end column portions 110 so as to bend the base portion thereof, which requires assembling man-hours and productivity is not necessarily high.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a one-way clutch in which a spring can be easily assembled and productivity can be improved.

The above object of the present invention can be achieved by the following constitution.
(1) An inner member, an outer member disposed concentrically with the inner member around the inner member, and a plurality of members disposed between the outer peripheral surface of the inner member and the inner peripheral surface of the outer member. A roller, a retainer having a pocket for individually accommodating the roller, and a spring for elastically pressing the roller in a locking direction, and one of the inner member and the outer member has a circumferential direction A one-way clutch in which a plurality of ramp surfaces are formed,
The cage includes a pair of annular portions, a plurality of bridge portions that connect the pair of annular portions, and an axially intermediate portion of the bridge portion that extends radially outward to hold the spring. A central pillar, and
The one-way clutch according to claim 1, wherein a height of at least a portion of the central column that contacts the spring is lower than a height of the spring.

  According to the present invention, the height of the portion of the cage that contacts the spring of the central column portion is made lower than the height of the spring, so that the spring can be smoothly and smoothly inserted without intentionally bending, Assembling of the spring becomes easy and productivity can be improved.

  Hereinafter, a one-way clutch according to each embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a pulley apparatus with a built-in one-way clutch in which a one-way clutch is incorporated. As shown in FIG. 1, a pulley device 10 with a built-in one-way clutch includes a sleeve 11 that can be fixed by being screwed to a rotation shaft (not shown) of an auxiliary machine such as an alternator, and a sleeve radially outside the sleeve 11. 11 and a pulley 12 having a belt groove 12a formed on the outer peripheral surface thereof. A drive belt (not shown) suspended from a drive pulley (not shown) fixed to the crankshaft of the engine is stretched over the belt groove 12a. Further, the screw portion 11a provided on the inner peripheral surface of the sleeve 11 to be screwed with the rotating shaft may be processed by rolling in consideration of the processing cost, or can be accurately formed by processing by turning. .

  A one-way clutch 13 is disposed between the outer peripheral surface of the sleeve 11 in the axial intermediate portion and the inner peripheral surface of the pulley 12 in the axial intermediate portion. A pair of support bearings 14 are arranged between the pulley 12 and the inner peripheral surface at both axial ends of the pulley 12 so as to sandwich the one-way clutch 13. A deep groove ball bearing is used as the support bearing 14 and supports the sleeve 11 and the pulley 12 so as to be relatively rotatable while supporting a radial load applied to the pulley 12.

  The one-way clutch 13 is press-fitted and fixed to the outer peripheral surface of the sleeve 11, and is fixed to the inner peripheral surface of the pulley 12 by being press-fitted and fixed to the inner peripheral surface of the pulley 12 and the inner ring 15 around the inner ring 15. It has the outer ring | wheel 16 which is a cylindrical outer member arrange | positioned concentrically, and the some roller 17 arrange | positioned rotatably between the outer peripheral surface of the inner ring | wheel 15, and the inner peripheral surface of the outer ring | wheel 16. The outer peripheral surface of the inner ring 15 forms a cam surface having a plurality of ramp surfaces 18 formed at equal intervals in the circumferential direction, and each roller 17 is located between the cylindrical surface 19 of the outer ring 16 and each ramp surface 18. Are arranged in each wedge space 20 formed respectively.

  The one-way clutch 13 includes a cage 21 having a plurality of pockets for individually accommodating the rollers 17 and a plurality of springs 22 that elastically press the rollers 17 in a direction that exerts a wedge action, that is, a locking direction. And have.

  As shown in FIG. 2, the retainer 21 includes a pair of annular portions 23 and a plurality of bridge portions 24 that are the same number as the rollers 17 that connect the pair of annular portions 23, and the pair of annular portions 23. Each of the pockets for accommodating the rollers 17 is constituted by the bridge portions 24 adjacent to each other. Convex portions 25 that engage with both axial ends of the lamp surface 18 are formed on the inner peripheral surfaces of the pair of annular portions 23, and the retainer 21 and the inner ring 15 are fixed integrally with each other. Further, on the inner surface side of the pair of annular portions 23, central pillar portions 26 projecting radially outward from the outer peripheral surface of each bridge portion 24 at the axially intermediate portion and both axial end portions of each bridge portion 24. And the both-ends column part 27 is formed.

  In the present embodiment, the central column portion 26 is formed in a substantially rectangular parallelepiped shape, and the height A of the portion of the central column portion 26 that contacts the spring 22 is set lower than the height B of the spring 22. Further, a stopper 28 for preventing the spring 22 from coming off due to centrifugal force is formed at the upper end of the both-end column 27.

  Therefore, the spring 22 is a leaf spring, and is held by holding the base portion 29 between the central column portion 26 and the both end column portions 27, and the pressing portion that urges the roller 17 in the locking direction by bending the base portion 29. 30, and the distal end portion of the pressing portion 30 is further bent to constitute the contact portion 31. As a result, the spring 19 comes into contact with each roller 17 at the contact portion 31 and elastically presses each roller 17 in the locking direction.

  The pulley device 10 with a built-in one-way clutch configured in this way has a tendency that the outer ring 16 rotates relative to the inner ring 15 in a predetermined direction when the rotation angular speed of the pulley 12 is faster than the rotation angular speed of the rotating shaft. In this case, the roller 17 has a wedge shape on the side where the ramp surface 18 is shallow, that is, on the narrow side of the wedge space 20 based on the force received from the inner peripheral surface of the outer ring 16 and the spring force of the spring 22. Each roller 17 engages between the outer ring 16 and the inner ring 15 by biting. As a result, the pulley 12 and the sleeve 11 cannot be rotated relative to each other (in a locked state), and the rotational force of the engine is transmitted to the rotating shaft.

  On the other hand, when the rotational angular velocity of the pulley 12 is slower than the rotational angular velocity of the rotating shaft, the roller 17 is deepened against the spring force of the spring 22 based on the force received from the inner peripheral surface of the outer ring 16. The roller 17 is displaced to the wider side, that is, the wider side of the wedge space 20, the engagement of the roller 17 is released, and the relative rotation between the pulley 12 and the sleeve 11 becomes free (overrun state).

  Further, in the one-way clutch 13 of the present embodiment, when the spring 22 is assembled to the cage 21, as shown by the spring 22a in FIG. It can be inserted between the column portion 26 and the both end column portions 27. The inserted spring 22 is securely held between the central column portion 26 and the both end column portions 27 with the plate thickness of the spring 22 as a tightening margin, and is also provided with a retaining portion 28 formed on the both end column portions 27. Removal due to centrifugal force is prevented.

  Therefore, in the one-way clutch 13 of the present embodiment, the height A of the portion of the central pillar portion 26 of the retainer 21 that contacts the spring 22 is lower than the height B of the spring 22, so the spring 22 is intentionally bent. Therefore, the spring 22 can be inserted smoothly and obliquely, so that the spring 22 can be easily assembled and the productivity can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIGS. In this embodiment, the shape of the central pillar portion of the cage of the one-way clutch is only different from that of the first embodiment, and other parts are the same as those of the first embodiment, and description thereof is omitted. Simplify.

As shown in FIGS. 4 and 5, the central column portion 26 ′ of the cage 21 ′ of the present embodiment has a contact surface 26 a that contacts the spring 22 on the side facing the spring 22, and an upper side of the contact surface 26 a. It is formed in a substantially pentagonal prism shape having an inclined surface 26 b inclined with respect to the surface of the spring 22. For this reason, as in the first embodiment, the height A of the portion of the central post 26 'that contacts the spring 22 is set to be lower than the height B of the spring 22, and the spring 22 is assembled to the cage 21'. As shown in the spring 22a of FIG. 5, the spring 22a can be inserted between the central column portion 26 ′ and the both end column portions 27 smoothly and obliquely without substantially bending.
Other configurations and operations are the same as those in the first embodiment.

(Third embodiment)
Next, the third embodiment of the present invention will be described in detail with reference to FIG. The present embodiment is different from the first embodiment only in the shape of the cage and spring of the one-way clutch, and the other parts are the same as those in the first embodiment, and the description is omitted or simplified. To do.

  In the cage 21 '' of the present embodiment, instead of providing both end column portions 27 on the bridge portion 24, a dug portion 40 that accommodates both end portions of the base portion 29 of the spring 22 'is formed in the pair of annular portions 23. In addition, a retaining portion 41 that prevents the spring 22 ′ from coming off due to centrifugal force is formed at the upper end portion of the upsetting portion 40.

  As in the first embodiment, a central pillar portion 26 having a height A set lower than the height B of the spring 22 ′ is formed in the intermediate portion in the axial direction of the bridge portion 24. The spring 22 ′ is held by the pillar portion 26. Thus, also in this embodiment, since the height of the portion that contacts the spring 22 'of the central column portion 26 is set low, the central column portion 26 and the dug portion can be smoothly formed with the spring 22' inclined. 40 can be inserted.

Moreover, in this embodiment, since it is not necessary to provide both end pillar parts in the bridge part 24, the stroke of the roller 17 is ensured enough, or the number of the rollers 17 is increased and torque capacity is increased. Can do. In addition, since spring 22 'supports the both ends of a base by the upsetting part 40 formed of a pair of annular part 23, the length of spring 22' is longer than the spring 22 of 1st and 2nd embodiment. Is formed.
Other configurations and operations are the same as those in the first embodiment.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

In the present embodiment, the inner peripheral surface of the outer ring is a cylindrical surface and the outer peripheral surface of the inner ring is a cam surface, but the inner peripheral surface of the outer ring may be a cam surface and the outer peripheral surface of the inner ring may be a cylindrical surface.
In this embodiment, the inner ring of the one-way clutch is the inner member and the outer ring of the one-way clutch is the outer member. However, the sleeve in which the inner ring is integrally formed is the inner member, or the pulley in which the outer ring is integrally formed is the outer member. It is also good.
In this embodiment, the pulley device with a built-in clutch is mounted between the rotating shaft of the alternator and the driven pulley. However, the pulley device may be mounted between the pulley of the starter and the rotating shaft. Only when there is a tendency to make relative rotation in a predetermined direction, torque can be transmitted between the inner ring and the outer ring.

It is a longitudinal cross-sectional view of the pulley apparatus with a built-in clutch which is 1st Embodiment of this invention. It is a perspective view which shows the holder | retainer and spring of the one-way clutch of FIG. It is sectional drawing which shows the state which incorporates a spring in the holder | retainer of FIG. It is a perspective view which shows the holder | retainer and spring of the one-way clutch which are 2nd Embodiment of this invention. It is sectional drawing which shows the state which incorporates a spring in the holder | retainer of FIG. It is a perspective view which shows the holder | retainer and spring of a one-way clutch which are 3rd Embodiment of this invention. It is sectional drawing of the conventional one-way clutch. It is a perspective view which shows the holder | retainer and spring of the conventional one-way clutch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Clutch built-in type pulley apparatus 11 Sleeve 12 Pulley 13 One-way clutch 14 Support bearing 15 Inner ring 16 Outer ring 17 Roller 18 Lamp surface 19 Cylindrical surface 21 Cage 22 Spring 26 Central column part 27 Both-ends column part

Claims (1)

An inner member, an outer member disposed concentrically with the inner member around the inner member, and a plurality of rollers disposed between an outer peripheral surface of the inner member and an inner peripheral surface of the outer member; A cage having pockets for individually accommodating the rollers, and a spring for elastically pressing the rollers in the locking direction, and one of the inner member and the outer member extends in a circumferential direction. A one-way clutch in which a plurality of ramp surfaces are formed,
The cage includes a pair of annular portions, a plurality of bridge portions that connect the pair of annular portions, and an axially intermediate portion of the bridge portion that extends radially outward to hold the spring. A central pillar, and
The one-way clutch according to claim 1, wherein a height of at least a portion of the central column that contacts the spring is lower than a height of the spring.

Images