JPH0596570U - One way clutch - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent excessive rotation in the releasing direction of each sprag by colliding the projections formed on the sprags that are adjacent in the circumferential direction with each other. [Structure] A large number of sprags 1 arranged at a predetermined pitch in the circumferential direction between an outer race 10 and an inner race 11.
In the one-way clutch having 4, the projections 15 and 16 projecting in the facing direction from each other are formed on the facing walls of the front sprag 14-1 and the rear sprag 14-2 that are circumferentially adjacent to each other. 1 and rear sprag 14-2
When they rotate in the releasing direction, the projections 15 and 16 collide with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a one-way clutch in which a large number of sprags are interposed between the outer race and the inner race, and the torque transmission between the outer race and the inner race is performed only in one direction by the operation of the sprags. is there.

[0002]

[Prior Art]

 As a conventional technique, there is one shown in FIGS. 3 and 4. In FIGS. 3 and 4, A is a one-way clutch, and a large number of sprags 5 are arranged between the outer race 1 and the inner race 2 by a retainer 3 at a predetermined pitch in the circumferential direction. The retainer 3 is formed in the shape of an annular box whose outer peripheral surface is closed, and a large number of support holes 4 are formed in the peripheral wall 3a at a predetermined pitch in the circumferential direction, and the outer peripheral portions of the sprags 5 are formed in the support holes 4. Let it fit loosely.

Each of the sprags 5 has an outer peripheral surface 5a and an inner peripheral surface 5b formed into a smooth curved surface so as to face the inner peripheral surface of the outer race 1 and the outer peripheral surface of the inner race 2, and a front portion in the circumferential direction (see FIG. 3), the step portion 6 having a wide inner peripheral side is formed on the left side in FIG. The step portion 6 is adapted to collide with the inner surface of the peripheral wall 3a of the retainer 3 when each sprag 5 rotates a predetermined amount in the releasing direction (in the direction of arrow A in FIG. 3). Further, a groove 7 extending in the circumferential direction of the inner race 2 is formed in the inner peripheral portion of each sprag 5 on the inner race 2 side, and a ring-shaped elastic body 8 made of a coil spring is fitted into the groove 7. By the reaction force of the elastic body 8, each sprag 5 is pressed toward the inner peripheral surface of the outer race 1 and is urged to rotate in the engaging direction (the direction opposite to the arrow A in FIG. 3).

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional type, when each sprag 5 rotates a predetermined amount in the releasing direction, the step 6 of the sprag 5 collides with the inner surface of the peripheral wall 3a of the retainer 3 to control further rotation in the releasing direction. However, there is a drawback that the retainer 3 is deformed or damaged. The present invention aims to obtain a novel one-way clutch that solves the above-mentioned drawbacks.

[0005]

[Means for Solving the Problems]

 The present invention is configured as follows to achieve the above object. That is, in a one-way clutch having a large number of sprags arranged at a predetermined pitch in the circumferential direction between the outer race and the inner race, a unidirectional clutch is formed on the facing wall between the front sprag and the rear sprag that are circumferentially adjacent to each other. Protrusions that are displaced radially with respect to the rotational axis of the clutch and project in opposite directions are formed, and the front sprags and the rear sprags collide with each other when they rotate a predetermined amount in the releasing direction. It is configured to prevent further rotation in the releasing direction.

[0006]

[Action]

 Since the present invention is configured as described above, when each sprag rotates a predetermined amount in the releasing direction, the protrusions provided on the front and rear sprags adjacent to each other in the circumferential direction are engaged with each other so that the sprag The rotation in the above releasing direction is restricted. In this case, since the protrusion is integral with the sprag, it has high strength and wear resistance.

[0007]

【Example】

 An embodiment 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 according to the present invention in a state in which a sprag rotates in a releasing direction, and FIG. FIG. In FIG. 1, B is a one-way clutch, and a large number of sprags 14 which are arranged at a predetermined pitch in the circumferential direction by a retainer 12 are interposed between an outer race 10 and an inner race 11. The outer race 10, the inner race 11 and the retainer 12 have the same structure as the conventional one, and the outer peripheral portions of the respective sprags 14 are inserted into the support holes 13 formed in the peripheral wall 12a of the retainer 12 at a predetermined pitch in the circumferential direction. Fit.

Each of the sprags 14 has an outer peripheral surface 14a and an inner peripheral surface 14b formed into a smooth curved surface so as to face the inner peripheral surface of the outer race 10 and the outer peripheral surface of the inner race 11 and to be adjacent to each other in the circumferential direction. Protrusions 15 and 16 that are displaced in the radial direction with respect to the rotation axis of the one-way clutch B and project in the facing direction with respect to each other are formed on the facing wall between the partial sprag 14-1 and the rear sprag 14-2. That is, the protrusion 15 formed on the front sprag 14-1 is made to project rearward (to the right in FIG. 1) to the middle portion in the radial direction of the rear surface (right side in FIG. 1) of the front sprag 14-1 and the rear sprag 14-1. The protrusion 16 formed at -2 is projected forward (leftward in FIG. 1) to the inner peripheral portion of the front surface (left side in FIG. 1) of the rear sprag 14-2. As shown, the front sprags 14-1 and the rear sprags 14-2 collide with each other when they rotate by a predetermined amount in the releasing direction (in the direction of arrow A in FIG. 1), thereby causing the front sprags 14- 1 and the rear sprag 14-2 are restricted from rotating further in the releasing direction.

Further, the second protrusions 17 and 18 are formed on the facing wall between the front sprag 14-1 and the rear sprag 14-2. That is, the second protrusion 17 formed on the front sprag 14-1 is projected forward (to the right in FIG. 1) to the inner peripheral portion of the rear surface (right side in FIG. 1) of the front sprag 14-1, The second protrusion 18 formed on the sprag 14-2 is made to project forward (leftward in FIG. 1) to the radial middle portion of the front surface (left side in FIG. 1) of the rear sprag 14-2, and these second protrusions 17 are formed. 2, 18 are caused to collide with each other when the front sprag 14-1 and the rear sprag 14-2 rotate a predetermined amount in the engaging direction (rotate in the direction of arrow a in FIG. 1), as shown in FIG. As a result, further rotation of the front sprag 14-1 and the rear sprag 14-2 in the engaging direction is restricted.

A groove 19 extending in the circumferential direction of the inner race 11 is formed in the inner peripheral portion of each sprag 14 on the inner race 11 side, and a ring-shaped elastic body 20 made of a coil spring is fitted into the groove 19. The sprags 14 are pressed against each other by the reaction force of the elastic body 20 toward the inner peripheral surface of the outer race 10 and are self-biased in the engaging direction (the arrow A direction in FIG. 2). The center of gravity G of each sprag 14 is set on the normal rotation (anti-idling) side of the outer race 10 with respect to the rotation center O.

According to the above embodiment, in the initial stage, the sprags 14 (the front sprags 14-1 and the rear sprags 14-2) are pressed toward the outer race 10 by the reaction force of the elastic body 20. At the same time, the outer peripheral surface 14a and the inner peripheral surface 14b of each sprag 14 come into contact with the inner peripheral surface of the outer race 10 and the outer peripheral surface of the inner race 11 by being rotated about the rotation center O in the arrow (a) direction, that is, the engaging direction. To do. When the outer race 10 rotates in the idling direction (c) in this state, each sprag 14 is swung in the same direction by the outer race 10, and the centrifugal force generated by this swivel causes each sprag 14 to rotate about its rotation center O. As shown in FIG. 1, when the center of rotation is the arrow (a), that is, the rotation direction in the releasing direction, and the rotation angle becomes a predetermined angle, the protrusions provided on the front and rear sprags 14-1 and 14-2 adjacent in the circumferential direction as shown in FIG. When 15 and 16 are engaged with each other, further rotation of each slug 14 in the releasing direction, that is, excessive rotation is restricted.

When the outer race 10 rotates in the engaging direction (d), the outer peripheral surface 14 a and the inner peripheral surface 14 b of each sprag 14 are caused by the reaction force of the elastic body 20 to form the inner peripheral surface of the outer race 10 and the inner race 11 respectively. Since it is in contact with the outer peripheral surface of the, the arrow (a) rotates in the engaging direction, and when this rotation angle reaches a predetermined angle, as shown in FIG. The second protrusions 17 and 18 provided on the terminals 1 and 14-2 are engaged with each other to prevent the sprags 14 from rotating further in the engaging direction, that is, excessive rotation.

[0013]

[Effect of the device]

 As is apparent from the above description, in the present invention, the protrusions formed on the facing walls of the sprags adjacent to each other in the circumferential direction collide with each other to restrict excessive rotation of the sprags in the releasing direction. The retainer is not deformed at the time of regulation, and the regulation can be reliably performed for a long period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a one-way clutch according to the present invention with a sprag rotating in a releasing direction.

FIG. 2 is a cross-sectional view of a main part of a one-way clutch sprag according to the present invention in a state in which the sprag rotates in an engaging direction.

FIG. 3 is a cross-sectional view of a main part of a conventional one-way clutch in which a sprag rotates in a releasing direction.

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

[Description of Reference Signs] B one-way clutch 10 outer race 11 inner race 12 retainer 12a peripheral wall 13 support hole 14 sprag 14-1 front sprag 14-2 rear sprag 14a outer peripheral surface 14b inner peripheral surface 15 protrusion 16 protrusion 17 second protrusion 18 2nd protrusion 19 Groove 20 Elastic body G Center of gravity of sprag O Rotation center of sprag

Claims (1)

[Scope of utility model registration request] 1. Between the outer race and the inner race,
In a one-way clutch having a large number of sprags arranged at a predetermined pitch in the circumferential direction, a radial displacement with respect to the rotational axis of the one-way clutch is made on the facing wall between the front sprag and the rear sprag that are adjacent in the circumferential direction. Then, when the front sprag and the rear sprag rotate by a predetermined amount in the releasing direction, the protrusions collide with each other to prevent further rotation in the releasing direction. Characteristic one-way clutch.