JP2971767B2 - One-way clutch sprag holding device - 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 large number of sprags are interposed between an outer race and an inner race and torque is transmitted in one direction by operation of the sprags. The present invention relates to a holding device.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional technique. In FIG. 6, reference numeral 1 denotes an outer race, 2 denotes an inner race coaxially fitted in the outer race 1, and a number of sprags arranged at a predetermined pitch in a circumferential direction by a retainer 6 between the outer race 1 and the inner race 2. 3 is interposed. A groove 4 extending in the circumferential direction is formed on the inner peripheral side of each sprag 3, and a return spring 5 formed by making a coil spring into a ring shape is fitted into this groove 4 to put each sprag 3 in the engagement direction, that is, the arrow ( A) Energize rotation in the direction. The retainer 6 is formed by punching and drawing a sheet metal material with a press machine, forming rectangular holding holes 6a at a predetermined pitch in a circumferential direction in a cylindrical main body.
The outer peripheral end of the sprag 3 is rotatably fitted and held in a.
Reference numeral 6b denotes a flange that protrudes radially outward from both ends of the cylindrical main body, and frictionally engages the retainer 6 with the outer race 1.

[0003]

In the prior art, when assembling, each sprag 3 is fitted into the holding hole 6a of the retainer 6, and the return spring 5 is fitted into the groove 4 of each sprag 3. When these are made into a unit, the radially outward pressing force of the return spring 5 causes the outer peripheral end portion 3a of each sprag 3 to move radially outward from the holding hole 6a of the retainer 6, as indicated by the phantom line in FIG. The outer race 1 protrudes greatly toward the outer race 1 and becomes larger than the inner diameter of the outer race 1.
For this reason, the outer race 1 in the state of the unit
And the inner race 2 is difficult to assemble. Further, if the sprags 3 are accidentally strongly pushed in the axial direction at the time of this assembling, the sprags 3 are detached from the retainer 6 in the axial direction, and it is necessary to reassemble the sprags 3 again. There were drawbacks. An object of the present invention is to provide a sprag holding device for a one-way clutch which has solved the above-mentioned disadvantages.

[0004]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, a pair of recesses facing each other are formed on both sides of a sprag interposed between the outer race and the inner race, and holding holes in which the sprags are fitted are formed in a cylindrical main body at a predetermined pitch in a circumferential direction. The retainer strap is formed by bending a belt-shaped retainer strap into an annular shape to elastically contact the inner peripheral surface of the retainer. Drill in the longitudinal direction at the same pitch as the retaining hole of the retainer,
At the center of each fitting hole in the circumferential direction, there is provided a locking piece for locking the concave portion formed on both sides of the sprag. Further, the retainer has a configuration in which the circumferential central portion of the holding hole is locally widened.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a sectional view of a main part of a one-way clutch showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II. In FIG. 1, reference numeral 10 denotes a rotating member such as a flywheel connected to a crankshaft of a motorcycle engine, and an outer race 11 is fixedly fastened to the right side (side surface) of the rotating member 10 by bolts. The outer race 11 has a mounting flange 11a protruding radially outward at the left end of a cylindrical main body, and an annular receiving recess 11b concave radially outward at an inner peripheral portion at the left end. A bolt is fixed to the rotating member 10 at the mounting flange 11a.

[0006] An inner race 12 is fitted concentrically on the axial center side of the outer race 11. The inner race 12 is fixed to a boss of a starter gear. A large number of sprags 13 are provided between the outer race 11 and the inner race 12.
, And each sprag 13 is held at a predetermined pitch in the circumferential direction by a retainer 17 and a retainer strap 22 made of a steel plate. As shown in FIGS. 1 and 2, each of the sprags 13 has a groove 14 extending in the circumferential direction on the inner peripheral side thereof, and circular recesses 15 facing each other on both left and right sides of each sprag 13. Then, a return spring 16 having a ring shape of a coil spring is fitted into the groove 14 to urge the sprags 13 to rotate in the engagement direction, that is, the direction of the arrow (A) in FIG.

The retainer 17 is formed by stamping and drawing a steel plate by a press machine, and as shown in FIG. 3, rectangular holding holes 18 are formed in a cylindrical main body at a predetermined pitch in a circumferential direction. At the same time, a relief recess 18a having a locally wide width is formed at the center in the circumferential direction of the holding hole 18.
As shown in FIG. 1, flanges 19 and 20 are formed on both left and right ends of the main body so as to protrude outward in the radial direction.
The left flange 19 is formed to have a larger diameter than the right flange 20, and the left flange 19 is fitted into the accommodation recess 11 b of the outer race 11 described above to regulate left and right movement in the outer race 11. Further, the right flange 20 is brought into contact with the inner peripheral surface of the outer race 11, that is, frictionally engaged.

[0008] The retainer strap 22 is made of a strip-shaped thin steel plate material rich in spring properties, and as shown in FIG.
In the longitudinal direction, a fitting hole 23 in which the sprag 13 is fitted into the elongated main body is formed at the same pitch as the holding hole 18 of the retainer 17. Are formed so as to protrude in directions facing each other. The locking pieces 24 project inward from the escape recesses 18 a of the holding holes 18 to be locked in the recesses 15 formed on both sides of the sprag 13. Numerals 25 are slits formed on both sides of the locking piece 24 for smooth bending of the locking piece 24 to facilitate locking of the sprag 13 to the recess 15. In addition, the retainer strap 22
After forming a fitting hole 23, a locking piece 24 and a slit 25, as shown in FIG.
2b is curved at a predetermined curvature, for example, with a radius of 40 mm to 50 mm. As shown in FIG. 5, this is made to be a perfect circle at the time of a circular curve so as to uniformly contact the inner peripheral surface of the retainer 17. It is for.

The retainer strap 22 is curved in a circular shape and fitted to the inner surface of the retainer 17, and the holding hole 18 and the fitting hole 23 are matched as shown in FIG. Next, the sprags 13 are pushed into the holding holes 18 and the fitting holes 23 from the axial center side, and the locking pieces 24 are elastically deformed and locked in the concave portions 15 of the sprags 13, and the return springs 16 are fitted in the grooves 14 of the sprags 13. Combine them into units. In this case, the escape recess 18 a is formed at the center in the circumferential direction of each holding hole 18, and the slits 25 are formed on both sides of the locking piece 24, so that each sprag 13 is pushed into the holding hole 18 and the fitting hole 23. In addition, the locking piece 24 can be smoothly elastically deformed and easily locked in the recess 15 of the sprag 13.

The retainer 17, the retainer strap 22, the sprag 13, and the return spring 1
In a state in which the unit 6 is a unit, as shown in FIG. 1, while being interposed between the outer race 11 and the inner race 12, the left flange 19 of the retainer 17 is housed in the housing recess 11 b of the outer race 11, This outer race 1
1 is bolted and fixed to the side surface of the rotating member 10.

According to the above embodiment, each sprag 13
Since it is locked by the locking piece 24 of the retainer strap 22, even if it is pressed radially outward by the return spring 16, it does not protrude radially outward from the holding hole 18 of the retainer 17. In addition, it does not move excessively inward in the radial direction and accidentally detaches from the retainer 17. For this reason, the retainer 17, the retainer strap 22, the sprags 13, and the return spring 16 can be easily interposed between the outer race 11 and the inner race 12 as a unit, and assembly can be performed easily and quickly. Will be. Further, since the retainer strap 22 is formed by punching a strip-shaped thin plate, it can be obtained at a low cost.

[0012]

As is apparent from the above description, according to the present invention, when assembling, the small sprags are stably held at the predetermined positions of the retainer. It can be easily assembled between Further, since the circumferential central portion of each holding hole of the retainer is locally widened, there is an effect that the locking piece of the retainer strap can be easily fitted (locked) to the concave portion of the sprag.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II.

FIG. 3 is a partial plan view showing a state where a retainer strap is fitted to the retainer.

FIG. 4 is a side view showing a deployed state of a retainer strap.

FIG. 5 is a side view showing a curved state of the retainer strap.

FIG. 6 is a sectional view of a one-way clutch showing a conventional example, corresponding to FIG. 2;

[Explanation of symbols]

 Reference Signs List 10 rotating member 11 outer race 11a mounting flange 11b receiving recess 12 inner race 13 sprag 14 groove 15 recess 16 return spring 17 retainer 18 holding hole 18a escape recess 19, 20 flange 22 retainer strap 22a, 22b left and right ends 23 fitting hole 24 engagement Stop piece 25 slit

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Claims (2)

(57) [Claims] A pair of recesses facing each other are formed on both sides of a sprag interposed between an outer race and an inner race, and a holding hole in which the sprag is fitted in a cylindrical main body is formed at a predetermined pitch in a circumferential direction. Provide a retainer formed by
A belt-shaped retainer strap is bent in an annular shape and is brought into elastic contact with the inner peripheral surface of the retainer. A sprag holding device for a one-way clutch, wherein the sprags are opened in a longitudinal direction at a pitch and locking pieces are provided at central portions in a circumferential direction of the respective fitting holes so as to be locked in concave portions formed on both sides of the sprag. 2. The sprag holding device for a one-way clutch according to claim 1, wherein said retainer has a locally wide central portion in a circumferential direction of a holding hole of said retainer.