JP2902337B2 - One-way clutch retainer - Google Patents

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 number of sprags are interposed between an outer race and an inner race and torque is transmitted in one direction by the operation of the sprags. The present invention relates to a retainer that holds sprags in a ring shape.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional technique. 5 and 6, reference numeral 1 denotes an outer race, and 2 denotes an inner race coaxially fitted in the outer race 1. The retainer 6 is arranged between the outer race 1 and the inner race 2 at a predetermined pitch in a circumferential direction. Many sprags 3 are interposed. Each sprag 3 is formed on its inner peripheral side with a groove 4 extending in a circumferential direction with respect to a retainer 6, and the retainer 6 is made of a steel plate (JIS SPCC) having a thickness of about 1 mm as shown in FIG. And flanges 6 projecting radially outward from both ends of the cylindrical body.
b is formed, and a rectangular holding hole 6a is formed in the body at a predetermined pitch in the circumferential direction.

[0003] The sprags 3 are fitted into the respective holding holes 6a of the retainer 6 from the inner peripheral side, and the return springs 5 composed of ring-shaped coil springs are fitted into the grooves 4 of the respective sprags 3 and the bottom thereof. Is pressed outward in the radial direction so that each sprag 3 is held in the holding hole 6 a of the retainer 6.
The sprags 3 are pressed and locked from the inner peripheral side to hold the sprags 3 arranged in a ring. In this state, each flange 6b of the retainer 6 is interposed between the outer race 1 and the inner race 2.
Is brought into contact with the inner peripheral surface 1 a of the outer race 1 to frictionally engage the retainer 6 with the outer race 1. Also,
Each sprag 3 is urged to rotate in the engaging direction (the direction of arrow A) by the elastic force of the return spring 5.

[0004]

In the above-mentioned prior art, the flange 6b of the retainer 6 is brought into contact with the inner peripheral surface 1a of the outer race 1 with a predetermined frictional force.
The outer diameter of b and the inner diameter of the outer race 1 must be machined with high precision, and there is a disadvantage that the machining requires time and skill. Further, due to machining errors in the outer diameter of the flange 6b and the inner diameter of the outer race 1, wear during use, and the like, the frictional engagement force of the retainer 6 with the outer race 1 greatly changes, and the timing of lift-off / on of the sprag 3, that is, the one-way clutch There was a drawback that the operation of became unstable. SUMMARY OF THE INVENTION It is an object of the present invention to provide a one-way clutch retainer which has solved the above-mentioned disadvantages.

[0005]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, a rectangular holding hole into which a sprag fits is formed in a cylindrical body at a predetermined pitch in a circumferential direction, flanges protruding in a radial direction are integrally provided at both ends of the body , and half of both flanges are provided . Radial direction
A plurality of elastic locking pieces that are separated by a slit extending in the thickness direction and elastically deformable in the thickness direction are formed in the circumferential direction, and the peripheral surface of the elastic locking piece is projected more radially than the peripheral surface of the flange , as well as repression locking the the outer circumferential surface of the inner peripheral surface or the inner race of each resilient locking piece outer race, each bullet
It is obtained by a structure in which Ru is inclined to one side sexual locking pieces to the flange. In this case, each of the elastic locking pieces has a tip.
Parts may it form an arc shape.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of a one-way clutch according to an embodiment of the present invention, FIG. 2 is a partial perspective view of a retainer according to an embodiment of the present invention, FIG. 3 is a side view of FIG. 2, and FIG.
-IV It is sectional drawing. In FIG. 1, A is a one-way clutch interposed between an outer race 10 and an inner race 11 fitted coaxially, and a plurality of steel sprags 20 are fixed in a circumferential direction by a steel plate retainer 13. The sprags 20 are arranged at a pitch, and each sprag 20 is urged to rotate in a direction of engagement by a return spring 22.

The retainer 13 has a thickness of about 0.2 mm.
2 to 4 of spring steel (JIS standard SK5). That is, the sprag 2 is attached to the cylindrical body 14.
A rectangular holding hole 15 into which the “0” fits is formed at a predetermined pitch in the circumferential direction, and flanges 16 protruding outward in the radial direction are integrally formed at both ends of the body portion 14, and each flange 16 faces each other. Three sets of elastic locking pieces 18 are formed at equal intervals in the circumferential direction. Each elastic locking piece 18 is formed in the circumferential direction of the flange 16 by a slit 17 extending in the radial direction into a small tongue-like shape in the circumferential direction so as to be elastically deformable in the thickness direction. The outer peripheral surface 18a of each elastic locking piece 18 is made to protrude radially outward from the outer peripheral surface 16a of the flange 16, and the diameter D of the outer diameter line connecting the outer peripheral surface 18a of each elastic locking piece 18 is: The diameter is slightly larger than the inner diameter of the outer race 10.

Further, each of the elastic locking pieces 18 is disposed outwardly of the flange 16 (the retainer 13 is connected to the outer race 1).
0 (in the direction opposite to the direction of fitting to 0). Also,
As shown by the solid line in FIG. 3, the side surface shape of the outer peripheral surface 18a of each of the elastic locking pieces 18 is projected radially outward with a radius of curvature smaller than the radius of curvature of the outer peripheral surface 16a of the flange 16, and The center of the direction is the top (maximum height). The shape of the side surface of the outer peripheral surface 18a is, as shown by a virtual line 18b in FIG.
May be recessed inward in the radial direction with a radius of curvature smaller than the radius of curvature of (i), and both ends in the circumferential direction may be top portions (maximum heights). This is the inner peripheral surface 10 of the outer race 10.
This is for increasing the contact pressure with a.

Each of the above-mentioned sprags 20 has substantially the same structure as the conventional one, and a return spring 22 is fitted on the inner peripheral side of the axially intermediate portion of a short and columnar main body formed in a predetermined cross-sectional shape. A matching groove 21 is formed. This groove 21 is perpendicular to the axis of the main body (circumferential direction of the retainer).
To form an extension. Then, the sprags 20 are fitted into the respective window holes 15 of the retainer 13 from the axial center side, and return springs 22 formed of annular coil springs are fitted into the grooves 21 of the sprags 20 from the inner peripheral side. The groove 2 is formed by the return spring 22.
1 is pressed radially outward to urge each sprag 20
Are arranged in a ring shape, and the retainer 13, each sprag 20 and the return spring 22 are formed into a unit shape.

In this state, the outer race 10 is interposed between the outer race 10 and the inner race 11 from the right in FIG. 1 and the top of the outer peripheral surface 18 a of each elastic locking piece 18 of the retainer 13 is attached to the inner peripheral surface of the outer race 10. The retainer 13 is frictionally engaged with the outer race 10 by elastic contact with the outer race 10. Further, each sprag 20 is urged to rotate in the engaging direction by the elastic force of the return spring 22.

According to the above embodiment, when the retainer 13 is interposed between the outer race 10 and the inner race 11, the elastic locking piece 18 is elastically deformed in the thickness direction, and the top of the outer peripheral surface 18a becomes the outer race. 10 inner peripheral surface 10a
Locally. Therefore, even if the outer diameter of the retainer 13 and the inner diameter of the outer race 10 change due to a processing error or wear during use, the change is absorbed by the restoring force of the elastic locking piece 18 in the thickness direction. The retainer 13 is always frictionally engaged with the outer race 10 at a substantially constant pressure. When the retainer 13 is frictionally engaged with the inner race 11 side,
The above-described flange 16 and elastic locking piece 18 are projected radially inward with respect to the body portion 14, and the elastic locking piece 18 projected radially inward is brought into elastic contact with the outer peripheral surface of the inner race 11. To

[0012]

According to the first aspect of the present invention, an elastic locking piece that is elastically deformable in the thickness direction is formed on a part of the flange of the retainer, and the elastic locking piece is formed on the inner peripheral surface of the outer race or the inner race. Because it was made to come into contact with the outer peripheral surface of the race,
The sprags, and thus the one-way clutch, operate stably without being affected by these processing errors or wear. Also, since it is possible to have a margin in the processing accuracy of the retainer, outer race or inner race,
Processing becomes easy and productivity increases. Also, since each elastic locking piece is inclined to one side with respect to the flange, when the inclined side is outwardly fitted to fit between the outer race and the inner race, the retainer is attached to each elastic locking piece. It will be guided and fitted smoothly. According to claim 2, each
Since the distal end of the elastic locking piece is formed in an arc shape, the contact pressure with the inner peripheral surface of the outer race can be changed by changing the radius of curvature. And so on.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a main part of a one-way clutch showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the retainer according to the present invention.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional side view of a main part of a one-way clutch showing a conventional example.

FIG. 6 is a sectional view of a retainer according to a conventional example.

[Explanation of symbols]

 A One-way clutch 10 Outer race 10a Inner peripheral surface 11 Inner race 13 Retainer 14 Body 15 Holding hole 16 Flange 17 Slit 18 Elastic locking piece 18a Outer peripheral surface 20 Sprag 21 Groove 22 Return spring

Claims (2)

(57) [Claims] A rectangular holding hole into which a sprag fits is formed in a cylindrical body at a predetermined pitch in a circumferential direction, and flanges protruding in a radial direction are integrally provided at both ends of the body. off <br/> elastically deformable elastic locking piece is plural number in the circumferential direction are separated by a slit extending in the radius direction in the thickness direction to flange, the flange peripheral surface of the elastic locking pieces than the circumferential surface to protrude radially, repression locking Then preparative said the outer peripheral surface of the inner peripheral surface or the inner race of each resilient locking piece outer race
Each of the elastic locking pieces is inclined to one side with respect to the flange.
Retainer of the one-way clutch ing by oblique. 2. A tip of each of said elastic locking pieces is formed in an arc shape.
Retainer of the one-way clutch in the name Ru claim 1 wherein form.