JPH08121506A - Sprag supporting device for one-way clutch - Google Patents

Abstract

PURPOSE: To prevent a retainer, a sprag supporting part and the like form being attacked even if a specified sprag is operated sooner than the other sprag in the engaging direction. CONSTITUTION: A many sprags 12 which are arranged in a circumferential direction at a prescribed pitch and a pair of washer shaped retainers 16 which are arranged on both sides of each sprag 12 are provided between an outer race 10 and an inner race 111, a supported part is provided on both sides of each sprag 12 and on the self-rotation center part of the sprag 12, and a supporting part 18 which is rotatably fit to the supported part of the sprag 12 is provided in the circumferential direction at the prescribed pitch on the side surface of each retainer 16.

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 the operation of the sprags, and more particularly to the one-way clutch. The present invention relates to a supporting device.

[0002]

2. Description of the Related Art As a conventional technique, there is one shown in FIGS. In FIG. 5, 1 is an outer race attached to the rotating side of a stator boss or the like, 2 is an inner race attached to the fixed side of a case or the like, and a large number of them are arranged by a retainer 3 between them at a predetermined pitch in the circumferential direction. The sprag 6 is interposed. The retainer 3 is shown in FIG.
As shown in Fig. 5, the sheet metal material is punched and drawn by a press machine to form rectangular holding holes 4 in a short tubular main body at a predetermined pitch in the circumferential direction, and on both sides radially outward. The holding hole 4 is formed by forming a bent flange 5.
By this, the outer peripheral end of the sprag 6 is fitted and held so as to be rotatable,
The flange 5 is brought close to the inner peripheral surface 1a of the outer race 1, and the retainer 3 is held so as to be coaxial with the outer race 1. Each of the sprags 6 has a groove 7 extending in the circumferential direction on the inner peripheral side thereof, and a return spring 8 having a ring shape of a coil spring is fitted into the groove 7 to engage each sprag 6 in the engaging direction, that is, as shown in FIG. At 5, the rotor is biased in the direction of the arrow (a).

[0003]

In the above-mentioned prior art, since the retainer 3 is located on the outer peripheral side of the rotation center C of the sprag 6, the outer race 1 rotates leftward in FIG. When rotating in the engaging direction (arrow A direction), a sprag 6 such as the one shown in FIG.
When the center sprag 6-1 rotates in the direction of the arrow (a) earlier than the other sprags 6-2, the forward end 6a (left end) of the center sprag 6-1 is the front edge of the retaining hole 4 of the retainer 3. There was a drawback that the retainer 3 was damaged by colliding with the 4a. Further, since the retainer 3 has a large number of holding holes 4 and the flange 5 protruding outward in the radial direction, the retainer 3 has a drawback that the shape is complicated and the manufacturing cost is increased. SUMMARY OF THE INVENTION It is an object of the present invention to provide a one-way clutch sprag support device that solves the above drawbacks.

[0004]

The present invention is configured as follows to achieve the above object. That is, a large number of sprags arranged at a predetermined pitch in the circumferential direction and a pair of washer-shaped retainers arranged on both sides of each sprag are provided between the outer race and the inner race, and both sprags are arranged on both sides of each sprag. In addition, a supported portion is provided at the center of rotation of the sprag, and a support portion to which the supported portion of the sprag is rotatably fitted is provided on the side surface of each retainer at a predetermined pitch in the circumferential direction.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a partial cross-sectional side view of a one-way clutch showing a first embodiment of the present invention, FIG. 2 is a II-II sectional view thereof, and FIG. 3 is a perspective view of a retainer according to the present invention. FIG.
In the figure, 10 is an outer race mounted on a rotating member such as a stator boss, 11 is an inner race mounted on a fixed member such as a case, and a large number of sprags 12 are circumferentially arranged between them to form a pair of washers. The retainers 16 and 16 are arranged on both sides of each of the sprags 12,
The retainers 16 and 16 hold the sprags 12 in an array at a predetermined pitch in the circumferential direction.

As shown in FIG. 2, each of the sprags 12 is located on both sides of the sprag 12 and has a center of rotation C of the sprag 12.
A supported portion 13 formed of a concave portion having a circular cross section is formed in the portion, and a groove 14 extending in the circumferential direction is formed in the left and right center portions on the inner peripheral side. In addition, each retainer 16 is made of sheet metal as shown in FIG.
It is formed as shown in FIG. That is, the washer-shaped disc main body 1 whose outer circumference approaches the inner circumferential surface 10a of the outer race 10 and whose inner circumference approaches the outer circumferential surface 11a of the inner race 11.
7 is formed, and a support portion 18 having a shaft having a circular cross section is formed at a predetermined pitch in the circumferential direction at a radial middle portion of the disc main body 17. The supporting portion 18 is formed by locally punching out the disc main body 17 to the side, and the supporting portion 13 of the sprag 12 is supported.
Shall have a diameter that allows rotation.

The pair of retainers 16 and 16 are coaxially faced so that the supporting portions 18 and 18 face each other, the sprags 12 are circumferentially arranged between the retainers 16 and 16, and the supported portions thereof are supported. 13 and 13 are fitted to the support portions 18 and 18 of the retainers 16 and 16, respectively, and the return spring 19 in which the coil spring is formed into a ring shape is fitted to the groove 14 of each sprag 12 so that the retainer 16 and
16, each of the sprags 12 and the return spring 19 are formed as a unit, and these are interposed between the outer race 10 and the inner race 11 as shown in FIGS. 1 and 2, and the outer and inner circumferences of the retainers 16 and 16 are outer races. The inner peripheral surface 10a of 10 and the outer peripheral surface 11a of the inner race 11 are brought close to each other to hold them coaxially, and the reaction force of the return spring 19 causes each sprag 12 to engage in the engaging direction.
That is, in FIG. 1, the motor is urged to rotate in the arrow (A) direction.

FIG. 4 shows a second embodiment. This one has a supported portion 13a formed of a shaft having a circular cross section on both sides of the sprag 12 and at the center of rotation C of the sprag 12, and in the left and right center portions on the outer peripheral side of the sprag 12 in the circumferential direction. The extending groove 14a is formed. On the other hand, a support portion 18a composed of holes having a circular cross section is formed at a predetermined pitch in the circumferential direction in the radial middle portion of the retainer 16, and the supported portion 13a on the sprag 12 side is rotatably fitted to the support portion 18a. It was done like this. Others have the same configuration as the first embodiment.

According to the above embodiment, each sprag 12 is
In the pair of retainers 16 and 16 formed in a washer shape,
Since the sprags 12 are rotatably supported about the rotation center C, when the respective sprags 12 rotate in the engaging direction (the direction of arrow A in FIG. 1), the specific sprags 12 are different from each other due to processing errors or the like. Even if the sprag 12 rotates faster than the sprag 12 in the direction of the arrow (A), the specific sprag 12 is retained by the retainer 1.
6 is not attacked, or the supported portion 13 (13a) and the supporting portion 18 (18a) that support the sprag 12 are not attacked. Further, the retainer 16 has a simple shape, which reduces the manufacturing cost.

[0010]

As is apparent from the above description, according to the present invention, when the one-way clutch is activated, even if a specific sprag operates in the engaging direction earlier than other sprags, the retainer is attacked, Since it does not attack the support part of the sprag, durability is increased. In addition, the structure is simple, and the cost is low.

[Brief description of drawings]

FIG. 1 is a partial sectional side view of a one-way clutch showing a first embodiment of the present invention.

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

FIG. 3 is a perspective view of a retainer according to the present invention.

FIG. 4 is a sectional view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional side view of a conventional one-way clutch.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a perspective view of a retainer according to a conventional example.

[Explanation of symbols]

 10 Outer Race 10a Inner Surface 11 Inner Race 11a Outer Surface 12 Sprag 13 (13a) Supported Part 14 (14a) Groove 16 Retainer 17 Disc Main Body 18 (18a) Support Part 19 Return Spring C Rotation Center

Claims (1)

[Claims] 1. Between the outer race and the inner race,
A large number of sprags arranged at a predetermined pitch in the circumferential direction and a pair of washer-like retainers arranged on both sides of each sprag are provided, and a supported portion is provided on both sides of each sprag and at the center of rotation of the sprag. And a support portion for rotatably fitting the supported portion of the sprag on the side surface of each retainer at a predetermined pitch in the circumferential direction.