JP2000170797A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way clutch which has a function to support the radial load, and of a compact width size. SOLUTION: A groove 7 connecting in the peripheral direction is provided on the inner diameter surface of an outer ring 1 having a cam surface 2, while a projection 11 engaged with the groove 7 is provided on the outer diameter surface of a ring form part 8a at one end side of a holder 4. And by making the holder 4 removal-proof by engaging both members, the collar of the outer ring 1 is made unnecessary, and the width size of this one-way clutch is made compact. And by making the inner bore size of the holder 4 in the same size with the outer bore of a shaft 6, the radial load is to be supported by the holder 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch in which a slanted cam surface is provided on an inner diameter surface of a shell-type outer race and a roller is locked in one direction between the cam surface and a shaft.

[0002]

2. Description of the Related Art One-way clutches of this type include, for example, those shown in FIGS. In this one-way clutch, a plurality of cam surfaces 22 inclined in the circumferential direction are provided on the inner diameter surface of a shell-shaped outer ring 21, and rollers 23 are held by resin cages 24 at positions facing these cam surfaces 22. Each roller 23 is pressed by a spring 25 attached to a cage 24 in a direction in which the roller 23 is locked between the outer diameter surface of the shaft 26 to which the one-way clutch is mounted and the cam surface 22 of the outer ring 21. Further, the retainer 24 is prevented from falling off by a flange of the outer ring 21.

In the one-way clutch, when the shaft 26 rotates in the direction opposite to the clutch operation side, the rollers 23 float and do not have a function to support a radial load. Therefore, the one-way clutch is used in combination with a radial bearing. You. The outer race 21 may be of a solid type.

[0004]

Since the conventional one-way clutch described above must be used in combination with a radial bearing, the total width of the one-way clutch and the radial bearing arranged in parallel becomes large, and a compact design is required. There is a problem that cannot be adopted in the bearing part which is used. Further, since the one-way clutch has flanges on both sides of the outer ring, there is also a problem that the width of the one-way clutch itself is large.

It is an object of the present invention to provide a one-way clutch having a function of supporting a radial load and having a compact width.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an inner ring of an outer ring having a plurality of cam surfaces inclined in a circumferential direction, wherein a roller faces each of the cam surfaces. Are held by a synthetic resin retainer having ring-shaped portions at both ends and pillars connecting the ring-shaped portions, and these rollers are pressed by a spring in a direction locked by the cam surface. In the directional clutch, a configuration is adopted in which the inner diameter of the cage is formed to be the same as the outer diameter of the shaft on which the one-way clutch is mounted.

That is, the radial load is supported by the cage by forming the inner diameter of the cage to be the same as the outer diameter of the shaft.

[0008] By forming the spring integrally with the retainer using a synthetic resin, the number of parts of the one-way clutch can be reduced.

The outer ring surface of the retainer ring-shaped portion is provided with a projection for engaging with the cam surface of the outer ring, and at least one of the ring-shaped portion outer diameter surfaces is provided with a circumferentially extending ridge. By providing a groove that engages with this ridge on the inner diameter surface of the outer ring, at least one end of the outer ring is formed in a straight shape without a flange, so that the retainer is prevented from coming off by the engagement of the ridge and the groove, The width of the one-way clutch can be reduced by omitting the flange of the outer ring at least at one end. Further, the engagement of the projection of the retainer with the cam surface of the outer ring can prevent the retainer from shifting in the circumferential direction.

[0010] By providing the ridge of the cage inside the outermost end of the cage, the end surface of the cage is brought closer to the end surface of the outer ring, and the contact width between the ring-shaped portion and the shaft is increased, so that the radial The load can be received in a wide area, and the load capacity of the radial load can be increased.

As the outer ring, a metal plate formed by deep drawing or a metal powder formed by sintering can be used. Further, if both ends of the outer ring are formed in a straight shape without a flange, a metal pipe formed by drawing a metal tube can be employed as the outer ring.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this one-way clutch, as shown in FIGS. 1 and 2, a plurality of cam surfaces 2 inclined in the circumferential direction are provided on the inner diameter surface of a shell-shaped outer ring 1 formed by forming a thin steel plate by deep drawing. A roller 3 is held at a position facing each cam surface 2 by a retainer 4 made of resin, and each roller 3 is a spring 5 attached to the retainer 4, and is connected to an outer diameter surface of a shaft 6 to which a one-way clutch is mounted. It is pressed in a direction to be locked between the outer ring 1 and the cam surface 2. The inner diameter of the retainer 4 is formed to be the same as the outer diameter of the shaft 6.

As shown in FIGS. 3 (a) and 3 (b), the outer race 1 is formed in a straight shape without flanges at both ends. Grooves 7 having the same depth and being continuous in the circumferential direction are provided.

As shown in FIG. 4, the retainer 4 comprises ring-shaped portions 8a and 8b at both ends and a column 9 connecting the ring-shaped portions 8a and 8b.
b, a projection 1 engaging with the cam surface 2 of the outer race 1
0 is provided. In addition, a ridge 11 that engages with the groove 7 of the outer race 1 is provided on an outer diameter surface of the one ring-shaped portion 8a. The ridge 11 is provided closer to the inner side than the end face of the retainer 4, and the contact width between the ring-shaped portion 8 a and the shaft 6 is increased by bringing the end face of the retainer 4 closer to the end face of the outer ring 1. Radial load is received over a wide area.

In the above-described embodiment, the groove 7 of the outer race 1 and the ridge 11 of the retainer 4 are continuous in the circumferential direction. However, they may be intermittently provided at positions where they are engaged with each other. Further, in this embodiment, the outer ring 1 is made of a thin steel plate formed by deep drawing, but a metal tube formed by drawing and a metal powder formed by sintering may be used. it can.

[0016]

As described above, in the one-way clutch of the present invention, the inner diameter of the retainer is formed to be the same as the outer diameter of the shaft, and the radial load is supported by the retainer. It is not necessary to use them together, and they can be used for bearings in which the mounting width is small. Further, the retainer is formed of a ring portion at both ends and a pillar portion connecting the ring portions, and a ridge extending in the circumferential direction is provided on an outer diameter surface of at least one of the ring portions. Providing grooves that engage with the ridges, these retainers prevent the retainer from coming off,
Since the flange of the outer ring is not required at least at one end side, the width of the one-way clutch itself can be reduced, and the one-way clutch itself can be used for a bearing portion in which the mounting width is more restricted. Furthermore, since the ridge of the cage is provided inside the outermost end of the cage, the end surface of the cage is closer to the end surface of the outer ring, and the contact width between the ring-shaped portion receiving the radial load and the shaft is increased. The load capacity of the radial load can be increased.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an embodiment of a one-way clutch.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

3A is a partially cutaway front view of the outer race of FIG. 1, and FIG. 3B is a partially enlarged perspective view of a.

FIG. 4 is a partially enlarged perspective view of the cage of FIG. 1;

FIG. 5 is a front sectional view of a conventional one-way clutch.

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Cam surface 3 Roller 4 Cage 5 Spring 6 Shaft 7 Groove 8a, 8b Ring-shaped part 9 Column part 10 Projection 11 Ridge 21 Outer ring 22 Cam surface 23 Roller 24 Cage 25 Spring 26 Shaft

Claims (7)

[Claims] A plurality of cam surfaces inclined in the circumferential direction are provided on an inner diameter surface of an outer race, and a ring-shaped portion at both ends and a pillar portion connecting the ring-shaped portions are provided at positions where rollers oppose the respective cam surfaces. In a one-way clutch in which these rollers are held by a spring in a direction in which the rollers are locked by the cam surface, the inner diameter of the cage is set by the one-way clutch. A one-way clutch formed to have the same dimensions as the outer diameter of a shaft to be used. 2. The one-way clutch according to claim 1, wherein the spring is formed integrally with the retainer using a synthetic resin. 3. An outer diameter surface of the retainer ring-shaped portion is provided with a projection which engages with a cam surface of the outer ring, and at least one of the ring-shaped portion outer diameter surfaces is provided with a circumferentially extending ridge. The one-way clutch according to claim 1, wherein a groove that engages with the ridge is provided on an inner diameter surface of the outer ring, and at least one end of the outer ring is formed in a straight shape without a flange. 4. The one-way clutch according to claim 3, wherein the ridge of the cage is provided inside the outermost end of the cage. 5. The one-way clutch according to claim 1, wherein said outer race is formed by deep drawing a metal plate. 6. The one-way clutch according to claim 1, wherein said outer race is formed by sintering a metal powder. 7. The one-way clutch according to claim 3, wherein both ends of the outer ring are formed in a straight shape without a flange, and the outer ring is formed by drawing a metal tube.