JP2008008349A - One-way clutch - Google Patents

Abstract

Provided is a one-way clutch that can reduce the manufacturing cost and prevent the accuracy of the outer cage from being lowered in the manufacturing process of the outer cage.
SOLUTION: An inner ring 1, an outer ring 2, a plurality of sprags 3 disposed between the inner and outer rings 1 and 2, an outer retainer 5 holding the sprags 3 at predetermined intervals in the circumferential direction, and an inner holding And a container 6. Furthermore, the 1st stop member 16 and the 2nd stop member 17 which were attached to the inner peripheral part of the outer ring | wheel 2 are provided, and these hold | maintain the outer holder | retainer 5 on both sides of the axial direction.
[Selection] Figure 1

Description

  The present invention relates to a one-way clutch.

  Conventionally known as one-way clutches for rotating the outer ring include an inner ring, an outer ring, a plurality of sprags disposed between the inner and outer rings, and an outer holding that holds the sprags at predetermined intervals in the circumferential direction. Some are equipped with a container and an inner cage. In this one-way clutch, when the outer ring rotates in one direction with respect to the inner ring, the sprag meshes between the inner and outer rings to transmit power, and when the outer ring rotates in the other direction with respect to the inner ring, the sprag is engaged. The outer ring is idled with respect to the inner ring and power transmission is interrupted.

The outer holder and the inner holder of such a one-way clutch are annular, and each has a cylindrical portion in which a plurality of pockets for holding sprags are formed. The outer cage has an annular flange that is bent outward in the radial direction at the end of the cylindrical portion, and a protruding portion called a T-bar (hereinafter referred to as a T-bar) is formed in a part of the circumferential direction of the flange. (Referred to as Patent Document 1).
The portion of the outer cage where the T-bar is formed has a larger radius than the raceway surface (inner circumferential surface) of the outer ring. When this outer cage is attached to the inner circumferential surface of the outer ring, the T-bar is compressed. The outer cage is held by the outer ring by the elastic deformation that occurs and the radial elastic force acting. As a result, when the outer ring rotates in the idling direction, the outer cage held by the outer ring rotates in the circumferential direction, and the sprag and the inner cage holding the sprag are brought along with the outer cage. Furthermore, it rotates in the circumferential direction.

JP-A-7-71490

In the T-bar described in Patent Document 1, in the outer cage, the buttocks in the vicinity of each of the two pockets are excised by pressing or grinding, and the buttocks between the excised parts are radially outward. By pressing, the radius of the flange is made larger than the radius of the raceway surface of the outer ring.
As described above, in the manufacture of the conventional outer cage, two steps of cutting and expanding the diameter by pressing are further required to form the T-bar, so that the cycle time of manufacturing the outer cage becomes longer, and the press For this reason, there is a problem that a metal mold is required and the manufacturing cost becomes high.
Furthermore, the press work for forming the T-bar may affect the cylindrical portion of the outer cage, and the accuracy such as roundness and cylindricity may be reduced. In this case, the gap between the pocket of the cylindrical portion and the sprag may be narrowed, and the movement of the sprag is restricted more than necessary, which may reduce the performance of the one-way clutch.

  Then, this invention aims at providing the one-way clutch which can reduce manufacturing cost and can prevent that the precision of the said holder | retainer falls by the manufacturing process of a holder | retainer.

To achieve the above object, a one-way clutch of the present invention includes an inner ring, an outer ring, a plurality of sprags arranged between the inner and outer rings, and a cage that holds the sprags at predetermined intervals in the circumferential direction. And a pair of stopper members attached to the inner periphery of the outer ring and holding the retainer sandwiched from both sides in the axial direction.
According to this configuration, the pair of stop members attached to the inner peripheral portion of the outer ring hold the retainer sandwiched from both sides in the axial direction. The T bar is not necessary, and additional processing for forming the T bar is not necessary. As a result, the manufacturing cost can be reduced, and it is possible to prevent the accuracy of the cage from being lowered in the cage manufacturing process as in the prior art.

In the one-way clutch, it is preferable that the stopper member holds the retainer from both sides in the axial direction by applying an elastic compressive force in the axial direction to the retainer.
According to this, since the pair of stopper members can hold the retainer on the outer ring by applying an axial elastic compressive force to the retainer, the retainer can be firmly fixed to the outer ring.

In the one-way clutch, at least one of the pair of stop members is attached to the inner peripheral surface of the outer ring by press-fitting from the axial direction, and the axial elastic compression is applied to the cage by the press-fitting. It is preferable to apply a force.
According to this, the retainer can be attached to the outer ring by press-fitting the stopper member into the outer ring from the axial direction, and assembly is facilitated. Furthermore, by controlling the press-fitting amount and press-fitting of the stopper member, an elastic compressive force having a predetermined size can be generated in the cage. Thereby, it can prevent that a holder | retainer is distorted unnecessarily and it can prevent that the performance of a one-way clutch falls.

  According to the present invention, the pair of stop members attached to the inner peripheral portion of the outer ring hold the cage sandwiched from both sides in the axial direction. The T bar is not necessary, and additional processing for forming the T bar is not necessary. As a result, the manufacturing cost can be reduced, and it is possible to prevent the accuracy of the cage from being lowered in the cage manufacturing process as in the prior art.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a one-way clutch of the present invention. The one-way clutch includes an inner ring 1, an outer ring 2, a plurality of sprags 3 disposed between the inner and outer rings 1 and 2 in the circumferential direction, and an outer holding that holds the sprags 3 at predetermined intervals in the circumferential direction. And a spring (not shown) for urging the sprag 3 in the meshing direction with respect to the inner ring 1 and the outer ring 2. In this one-way clutch, when the outer ring 2 rotates in one direction with respect to the inner ring 1, the sprag 3 meshes between the inner and outer rings 1 and 2 to transmit power, and the outer ring 2 rotates in the other direction with respect to the inner ring 1. In this case, the engagement of the sprags 3 is released and the power transmission is interrupted.

  The outer cage 5 has an annular shape, and a cylindrical portion 7 in which a plurality of pockets 11 (holes) are formed, and an annular cage formed by bending the axial end of the cylindrical portion 7 at a right angle outward in the radial direction. Part 8. Each sprag 3 is held in each of the pockets 11 at the radially outer side. Further, the maximum outer diameter of the outer cage 5, that is, the outer diameter of the flange portion 8 is the same as or slightly smaller than the inner diameter of the inner peripheral surface of the outer ring 2.

  The inner cage 6 has an annular shape, and a cylindrical portion 9 in which a plurality of pockets 12 (holes) are formed, and an annular cage formed by bending the axial end of the cylindrical portion 9 at a right angle inward in the radial direction. Part 10. Each sprag 3 is held in each of the pockets 12 at its radially inner portion. Further, the minimum inner diameter of the inner cage 6, that is, the inner diameter of the flange portion 10 is the same as or slightly larger than the outer diameter of the outer peripheral surface of the inner ring 1.

A pair of stop members 15 are attached to the inner peripheral portion of the outer ring 2 so that the outer cage 5 is sandwiched from both sides in the axial direction, and the outer cage 5 can be removed from the outer ring 2 and restricted in the axial direction. It has been. The stop member 15 in FIG. 1 includes a first stop member 16 on one end side (right side) in the axial direction of the outer cage 5 and a second stop member 17 on the other end side (left side). The first stopper member 16 is a C-shaped retaining ring, and the second stopper member 17 is an annular member.
A concave circumferential groove 20 is formed at a position near one axial end of the inner circumferential surface of the outer ring 2, and a first stopper member 16 is fitted and fixed to the concave circumferential groove 20 at the outer circumferential portion thereof. The inner peripheral surface of the first stopper member 16 has a smaller diameter than the outer peripheral surface of the cylindrical portion 7 of the outer cage 5, and the inner surface 16 a of the inner peripheral portion of the first stopper member 16 contacts the end surface 7 a of the cylindrical portion 7. it can.

  The second stopper member 17 is fitted and attached in close contact with the inner circumferential surface of the outer ring 2. The second stopper member 17 has a rectangular cross section and has an inner side surface 17 a that is orthogonal to the inner peripheral surface of the outer ring 2. The outer peripheral surface of the second stopper member 17 is slightly larger in diameter than the inner peripheral surface of the outer ring 2, and the second stopper member 17 is attached to the inner peripheral surface of the outer ring 2 by press-fitting in the axial direction. The inner peripheral surface of the second stopper member 17 has a smaller diameter than the flange portion 8, and the inner side surface 17 a of the second stopper member 17 can come into contact with the outer surface 8 a of the flange portion 8.

  The first retaining member 16 and the second retaining member 17 hold the outer cage 5 sandwiched from both sides in the axial direction. Further, the outer cage 5 is sandwiched from both sides in the axial direction and is held by applying an elastic compressive force in the axial direction to the outer cage 5. Specifically, in the state where the first stopper member 16 is fixed to the concave circumferential groove 20 of the outer ring 2 and the outer cage 5 holding the sprag 3 is provided on the inner peripheral side of the outer ring 2, the second stopper member 17 is By press-fitting into the outer ring 2 from the axial direction, the outer retainer 5 is sandwiched from both sides in the axial direction by the first retaining member 16 and the second retaining member 17, and an elastic compressive force is applied to the outer retainer 5.

  More specifically, FIG. 2 is an explanatory view for explaining a method of attaching the outer cage 5 to the outer ring 2. In the outer cage 5, a free state before receiving an axial load (indicated by a two-dot chain line in FIG. 2). In the illustrated state, the axial length is L, but the second stopper member 17 presses the outer cage 5 in the axial direction by press-fitting the second stopper member 17 into the outer ring 2 (arrow F). Then, an axial compressive load is applied to the outer cage 5 and, in the mounted state, an axial clamping allowance ΔL is provided between the outer cage 5 and the first stopper member 16 and the second stopper member 17. ing. As a result, an axial contact pressure is generated between the outer cage 5 and the first stopper member 16 and the second stopper member 17, and the first stopper member 16 and the second stopper member 17 attach the outer cage 5 to the outer ring. 2 can be held. In other words, the second retaining member 17 is press-fitted into the outer ring 2 to apply an elastic compressive force in the axial direction to the outer cage 5 to obtain a holding force for holding the outer cage 5 on the outer ring 2.

In this attachment state, even if the second stopper member 17 applies the elastic compressive force to the outer cage 5 and the second stopper member 17 receives the reaction force, the second stopper member 17 in the axial direction of the second stopper member 17. The position is maintained. That is, between the outer peripheral surface of the second stopper member 17 and the inner peripheral surface of the outer ring 2, an axial frictional force that resists the reaction force received by the second stopper member 17 from the outer cage 5 is second. This is caused by fitting (tightening fitting) between the stopper member 17 and the outer ring 2.
With the above configuration, the outer cage 5 can be fixed to the outer ring 2, and the outer cage 5 can be rotated with the rotation of the outer ring 2. And the inner holder | retainer 6 holding this sprag 3 can further rotate in the circumferential direction, and the outer ring 2 will idle with respect to the inner ring 1.

  Further, according to this embodiment, the outer diameter of the flange portion 8 of the outer cage 5 is the same as or smaller than the inner diameter of the inner circumferential surface of the outer ring 2. The holding force is not obtained by the elastic compressive force in the radial direction, and the first stopper member 16 and the second stopper member 17 sandwich the outer cage 5 from both sides in the axial direction and apply the elastic compressive force in the axial direction. Thus, the outer cage 5 is held by the outer ring 2. For this reason, the conventional T-bar protruding in the radial direction with respect to the outer cage 5 becomes unnecessary, and additional processing for forming the T-bar becomes unnecessary. For this reason, the manufacturing cost of the outer cage 5 can be reduced, and it is possible to prevent the accuracy of the outer cage 5 from being lowered in the manufacturing process of the outer cage 5 as in the prior art.

  Furthermore, since the outer retainer 5 can be attached to the outer ring 2 by press-fitting the second stop member 17 into the outer ring 2, the one-way clutch can be easily assembled. Furthermore, by controlling the press-fitting amount and press-fitting of the second stopper member 17, it is possible to generate an elastic compressive force having a predetermined size in the outer cage 5. Thereby, the outer cage 5 can be prevented from being unnecessarily distorted, and the pocket 11 can be prevented from being deformed to deteriorate the performance of the one-way clutch.

  FIG. 3 is a cross-sectional view of an essential part showing another embodiment of the one-way clutch of the present invention. This one-way clutch is different from that of FIG. 1 with respect to the stop member 15, and the other structure is the same. The pair of retaining members 15 of this embodiment includes a first retaining ring 22 on one end side in the axial direction of the outer cage 5 and a second retaining ring 23 composed of a retaining ring on the other end side. The first retaining ring 22 and the second retaining ring 23 are C-shaped retaining rings.

  Specifically, the first concave circumferential groove 20 is formed at a position near one axial end portion of the inner circumferential surface of the outer ring 2, and the first retaining ring 22 is provided in the concave circumferential groove 20 at the outer circumferential portion thereof. It is fitted and fixed. A second concave circumferential groove 21 is formed at a position near the other axial end of the inner circumferential surface of the outer ring 2, and a second retaining ring 23 is fitted and fixed to the concave circumferential groove 21 at its outer circumferential portion. ing.

  The outer retainer 5 is attached in a state where the first retaining ring 22 is fixed to the concave circumferential groove 20 of the outer ring 2 and the outer retainer 5 holding the sprag 3 is provided on the inner peripheral side of the outer ring 2. The ring 23 is fitted into the concave circumferential groove 21 of the outer ring 2, the outer cage 5 is sandwiched from both sides in the axial direction by the first and second retaining rings 22 and 23, and an elastic compressive force is applied to the outer cage 5. Thereby, the outer cage 5 can be fixed to the outer ring 2.

  In this embodiment, the axial dimension between the first and second retaining rings 22 and 23 in a state where the outer retainer 5 is not sandwiched is the axial dimension of the outer retainer 5 in a free state before attachment. Is set smaller than. Thus, by setting the outer cage 5 between the first and second retaining rings 22 and 23, the axial tightening margin between the retaining rings 22 and 23 and the outer cage 5 is reduced. The outer cage 5 is held by the outer ring 2 between the retaining rings 22 and 23.

Further, the one-way clutch of the present invention is not limited to the illustrated form, but may be of another form within the scope of the present invention. For example, although not shown, the inner peripheral surface of the stopper member 15 may have a smaller diameter than the inner peripheral surface of the cylindrical portion of the outer cage.
In addition to elastically compressing and deforming the outer retainer 5 in the axial direction by the pair of retaining members 15 and causing an axial tightening margin between the pair of retaining members 15 and the outer retainer 5, in FIG. In the state where the first stopper member 16 and the second stopper member 17 sandwich the outer cage 5 from both sides, the first stopper member 16 is elastically deformed outward in the axial direction. With the two retaining rings 22, 23 sandwiching the outer cage 5 from both sides, the first and second retaining rings 22, 23 are elastically deformed outward in the axial direction, and an axial elastic compressive force is applied to the outer cage 5. And the outer cage 5 may be held by the outer ring 2.

It is principal part sectional drawing which shows one Embodiment of the one-way clutch of this invention. It is explanatory drawing explaining the attachment method to the outer ring | wheel of an outer retainer. It is principal part sectional drawing which shows other embodiment of the one-way clutch of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Sprag 5 Outer cage 6 Inner cage 15 Stopping member 16 First retaining member 17 Second retaining member 22 First retaining ring 23 Second retaining ring

Claims (3)

  An inner ring, an outer ring, a plurality of sprags arranged between the inner and outer rings, a cage that holds the sprags at a predetermined interval in the circumferential direction, and a shaft that is attached to the inner circumferential portion of the outer ring A one-way clutch comprising: a pair of stop members that are sandwiched and held from both sides in the direction.   The one-way clutch according to claim 1, wherein the stopper member holds the retainer from both sides in the axial direction by applying an axial elastic compressive force to the retainer.   The at least one of the pair of stop members is attached to the inner peripheral surface of the outer ring by press-fitting from the axial direction, and the axial elastic compressive force is applied to the cage by the press-fitting. The one-way clutch according to 2.

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