JP3476602B2 - One-way clutch - 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 the operation of the sprags transmits torque in one direction.

[0002]

2. Description of the Related Art There is a conventional technique shown in FIGS. 5 and 6, 1 is an outer race, 2 is an inner race that is coaxially fitted in the outer race 1, and is arranged between the outer race 1 and the inner race 2 by a retainer 6 at a predetermined pitch in the circumferential direction. A large number of sprags 3 are interposed. Each sprag 3 is formed with a groove 4 extending in the circumferential direction with respect to the retainer 6 on the inner peripheral side thereof, and a return spring 5 formed by making a coil spring into a ring shape is fitted into this groove 4 so that each sprag 3 is radiused. Direction outward, press them in the engaging direction, that is, arrow (a)
Energize in the direction of rotation. The retainer 6 is formed by punching and drawing a steel plate material with a press machine, and rectangular holding holes 6a are formed in a cylindrical main body at a predetermined pitch in the circumferential direction. The outer peripheral end of is fitted and held so as to be rotatable. Reference numeral 6b is a flange that projects outward in the radial direction from both ends of the tubular main body, and
To frictionally engage the outer race 1 side.

[0003]

In the above-mentioned prior art, when assembling, each sprag 3 is fitted in the holding hole 6a of the retainer 6 and the return spring 5 is fitted in the groove 4 of each sprag 3. When these are made into units, the outer peripheral end portion 3a of each sprag 3 largely projects radially outward from the holding hole 6a of the retainer 6 due to the pressing force of the return spring 5 outward in the radial direction, and the outer race 1
The inner diameter is larger than the inner diameter of the outer race 1 and it becomes difficult to assemble it between the outer race 1 and the inner race 2. Also, if the sprag 3 is inadvertently strongly pressed in the axial direction during this installation,
The sprag 3 is disengaged from the retainer 6 in the axial direction and must be reassembled, which requires a skill and labor for the assembly. SUMMARY OF THE INVENTION It is an object of the present invention to obtain a one-way clutch sprag holding device which solves the above drawbacks.

[0004]

The present invention is configured as follows to achieve the above object. That is, a large number of sprags between the outer race and the inner race,
An annular retainer that fits and holds each sprag and is arranged at a predetermined pitch in the circumferential direction, and a ring-shaped return spring that pushes each sprag radially outward from the inner circumferential side to bias itself in the engaging direction. In a one-way clutch having and
A locking groove extending circumferentially with respect to the retainer is formed on one end side of each sprag in the axial direction, and an annular guide plate whose outer peripheral portion is fixed to one axial end of the retainer is provided. A locking piece is provided at the peripheral portion so as to project in the axial direction and fit into the locking groove of the sprag. In this case, the locking piece may be formed in a triangular shape in a plan view in which the width in the circumferential direction gradually decreases from the base portion toward the protruding end.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION 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, and FIG. 2 is a sectional view taken along the line II-II thereof. Figure 1
2, A is a one-way clutch, and a large number of sprags 12 are interposed between the outer race 10 and an inner race 11 coaxially fitted in the outer race 10, and each sprag 12 is made of a steel plate. The retainers 15 are held at a predetermined pitch in the circumferential direction. Outer race 10
Is an annular recess 10a that is recessed radially outward on the inner periphery of the left end.
Have.

Each of the sprags 12 has a locking groove 13 extending in the circumferential direction with respect to the retainer 15 at the center of one end (the left end in FIG. 1) in the axial direction, and the inner circumference of the central part in the axial direction. The groove 1 extending circumferentially with respect to the retainer 15
4 is formed. The locking groove 13 is formed in a semicircular cross section and linearly in the circumferential direction. The retainer 15 is formed by punching and drawing a steel plate material with a press machine, and has a rectangular holding hole 16 for circumferentially fitting and holding the outer peripheral end portion of each sprag 12 in a cylindrical main body in the circumferential direction. Are formed at a predetermined pitch, and flanges 15a, 15b are formed at both left and right ends of the main body so as to project outward in the radial direction.

The flange 15a on the left side is largely projected outward in the radial direction to be fitted in the recess 10a of the outer race 10, and the flange 15b on the right side is projected slightly outward in the radial direction to the inner periphery of the outer race 10. Face to face. When the outer race 10 is attached to a rotary member such as a flywheel, the left flange 15a is held by the rotary member and the outer race 10, and the outer race 1
This is for restricting the lateral movement of the retainer 15 within 0, and for frictionally engaging the retainer 15 with the outer race 10.

A guide plate 20 made of a stainless steel plate is arranged at one axial end (the left end in FIG. 1) of the retainer 15 and the sprag 12, and the outer peripheral portion 20a is overlapped with the flange 15a on the left side of the retainer 15. It is fixed by spot welding. This guide plate 20 is shown in FIG.
And as shown in FIG. That is, a cylindrical portion 20b that is bent inward in the axial direction (rightward in FIG. 1) is formed at the inner end of the outer peripheral portion 20a that extends outward in the radial direction, and the bent end of this cylindrical portion 20b is set 90 inward in the radial direction. Forming an inner peripheral portion 20c that bends at an angle of degrees, and further forming locking pieces 21 projecting inward in the axial direction (downward in FIG. 4) at a predetermined pitch in the curved end of the cylindrical portion 20b. To do.

The inner peripheral portion 20c is brought into contact with one axial end surface (the left end surface in FIG. 1) of each sprag 12 to prevent the sprag 12 from tilting in the retainer 15. The locking pieces 21 are fitted into the locking grooves 13 of the sprags 12 to prevent the sprags 12 from falling off the retainer 15 during assembly. Further, as shown in FIG. 4, the locking piece 21 is formed in a triangular shape in plan view in which the width in the circumferential direction gradually decreases from the base portion toward the projecting end, and
As shown in Fig. 2, in the initial stage of operation of the sprags after the assembling, the sprags 12 are positioned in the center of the locking groove 13 in the width direction, so that the sprags 12 as shown by phantom lines in FIG. The locking piece 21 does not come into contact with the side surface of the locking groove 13 in the operating range of each sprag 12, such as when operating in the engaging direction or in the releasing direction. Further, a return spring 18 formed by making a coil spring into a ring shape is fitted into the groove 14 of each of the sprags 12.
The left end portion (FIG. 2) of each sprag 12 is pressed outward by the radial direction 8 to urge the sprags 12 to rotate in the engaging direction, that is, the arrow (A) direction.

According to the above-described embodiment, when assembled, each sprag 12 is fitted into the holding hole 16 of the retainer 15 and the return spring 18 is fitted into the groove 14 of each sprag 12 to form a unit. At this time, the guide plate 20
The locking piece 21 of is locked in the locking groove 13 of each sprag 12,
The movement of each sprag 12 in the radial direction with respect to the retainer 15 is restricted. Therefore, during assembly, the sprags 12 largely protrude outward from the retainer 15 in the radial direction, and the retainer 15 is pressed by the pressure from the outward in the radial direction.
Will not come off and the assembly will be easier. Further, since the inner peripheral portion 20c faces the one end surface of the sprag 12 in the axial direction, the runout of each sprag 12 with respect to the rotation surface is regulated after the assembly, and the operation of the sprag 12 becomes smooth.

[0011]

As is apparent from the above description, the present invention can be easily assembled between the outer race and the inner race in the state where the sprag, retainer and return spring of small items are unitized. Further, since the locking piece is gradually reduced in width from the base portion toward the projecting end, the locking piece is fitted and locked in the locking groove extending in the circumferential direction on the axial end surface of the sprag. When the sprag operates, the pieces do not contact carelessly, and the sprag operates smoothly.

[Brief description of drawings]

FIG. 1 is a sectional side 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 in FIG.

FIG. 3 is a partial perspective view of a guide plate according to the present invention.

4 is a sectional view taken along the line IV-IV in FIG.

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

6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

A one-way clutch 10 outer race 10a recess 11 Inner Race 12 sprags 13 Locking groove 14 groove 15 retainer 15a, 15b flange 16 holding hole 18 Return spring 20 Guide plate 20a outer peripheral part 20b cylindrical part 20c inner circumference 21 Locking piece

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-59255 (JP, A) JP-A-58-163832 (JP, A) Actual Kaihei 4-11938 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16D 41/07

Claims (2)

(57) [Claims] 1. A large number of sprags between an outer race and an inner race, an annular retainer for fitting and holding each sprag and arranging the sprags at a predetermined pitch in a circumferential direction, and each sprag in a radially outer direction from an inner circumferential side. In a one-way clutch having a ring-shaped return spring that presses in one direction and biases itself in the engaging direction, a locking groove that extends in the circumferential direction with respect to the retainer is formed at one axial end of each sprag, An annular guide plate whose outer peripheral portion is fixed to one axial end of the retainer is provided, and an inner peripheral portion of the guide plate is provided with a locking piece that projects in the axial direction and fits into the locking groove of the sprag. A one-way clutch characterized by that. 2. The one-way clutch according to claim 1, wherein the engagement piece is formed in a triangular shape in a plan view in which the width in the circumferential direction gradually decreases from the base portion toward the projecting end.