JPH10184736A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way clutch which allows easy assembly and smooth operation of a sprag after assembly with a simple structure and with the number of parts reduced. SOLUTION: In a one-way clutch which involves a retainer 15 constituted by forming a plurality of window holes 16 at prescribed pitches in a circumferential direction at a cylindrical main body, and a plurality of sprags 20 which are fitted in the respective window holes 16 of the retainer 15 so as to revolve by itself and arranged in a circumferential direction, a width tapered part 20a whose width in the arranged direction of the sprag 20 decreases gradually toward in the axial direction of the retainer 15 is formed at the respective sprags 20, and a pair of receiving pieces 17a, 17b which protrude in an approaching direction to each other is formed at one part of both edge parts in the circumferential direction of the respective window holes 16. The intervals of a pair of receiving pieces 17a, 17b are a little smaller than the largest width of the width tapered part 20a, the sprag 20 is fitted into the window hole 16 of the retainer 15 from the outside in the radial direction, and the width tapered part 20a is made to face a pair of the receiving pieces 17a, 17b.

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. It is about.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Publication No. 4-9930 is disclosed.
There was one described in the official gazette. 10 and 11, reference numeral 1 denotes an outer race, and 2 denotes an inner race. Between the two, a large number of sprags 4 arranged at a predetermined pitch in the circumferential direction by an annular retainer 3 are interposed. The retainer 3 bends the wire in a U-shaped zigzag shape. The space (circumferential space) between the axial portions 3a of the retainer 3 is a space that can be locked to the arc-shaped bottom of the sprag 4, and the sprags 4 are fitted between the axial portions 3a from the radially outer side. The axial portion 3a and the outer peripheral groove 4 of each sprag 4
a and the garter spring 5 fitted to the
Pinch.

[0003] An annular side plate 6 is arranged on both sides of the retainer 3. An outer peripheral flange 6 extending outward and slidingly contacting the inner peripheral surface of the outer race 1 is provided on the inner and outer peripheral portions of the annular side plate 6.
a, and an inner peripheral flange 6b slidingly contacting the outer peripheral surface of the inner race 2. In addition, insertion portions 6c inserted between the circumferential portion 3b of the retainer 3 and the end face of the sprag 4 are alternately formed on the inner peripheral portion of the annular side plate 6, and the inner peripheral flange 6b and the insertion portion 6c are formed. In some cases, an axial portion 3a of the retainer 3 is fitted into the recess to form a recess 6d for preventing the movement of the retainer 3.

Another technique is disclosed in Japanese Patent Laid-Open No. 8-142.
No. 79 was described. In FIG. 12, 1 is an outer race, 2 is an inner race, and a number of sprags 11 arranged at a predetermined pitch in the circumferential direction are interposed between the two by an annular retainer 10.
The retainer 10 has a rectangular window hole 10a formed at a predetermined pitch in a circumferential direction in a cylindrical main body made of a steel plate material, and a flange 10b which is bent radially outward on both sides. Are arranged on a trajectory circle passing through the rotation center of the sprag 11.

The sprag 11 has an outer peripheral portion projecting outward in the left-right direction (axially outward) in a stepped manner with respect to the inner peripheral portion, and a groove 11b extending in the circumferential direction is formed at the axial center of the outer peripheral portion. Form. The step 11a on the lower surface of the protrusion is a sprag 11
From the center of rotation toward the outer peripheral side in a V-shape in side view. Then, each sprag 11 is fitted into the above-described window hole 10a of the retainer 10 from outside in the radial direction, and the step 1
1a is rotatably locked to the edge of the window hole 10a, and a ring-shaped garter spring 12 is fitted into the groove 11b of each sprag 11 to urge each sprag 11 to rotate in the engagement direction.

[0006]

The former has the drawback that the structures of the retainer 3 and the annular side plate 6 are complicated, the number of parts and the number of processing steps are increased, the cost is high, and the assembling is complicated. Was. In addition, the latter has a drawback that it requires V-shaped stepped portions 11a on both sides of the sprag 11 in the axial direction, which increases the number of processing steps and is expensive. An object of the present invention is to provide a new one-way clutch which has solved the above-mentioned disadvantages.

[0007]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, a retainer in which a large number of window holes are formed at a predetermined pitch in the circumferential direction in a cylindrical main body, and a large number of sprags which are fitted in the respective window holes of the retainer so as to be able to rotate and are arranged in the circumferential direction. In the one-way clutch having, in each sprag, a gradually decreasing width portion in which the width in the arrangement direction of the sprags gradually decreases in the axial direction of the retainer is provided on a part of both circumferential edges of each of the window holes. A pair of receiving pieces projecting in the approaching direction are provided, and the distance between the pair of receiving pieces is slightly smaller than the maximum width of the gradually decreasing width portion. And the gradually decreasing width portion faces the pair of receiving pieces. In this case, each of the pair of receiving pieces may be formed in a tapered shape that gradually approaches the axial direction of the retainer.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional side view showing a first embodiment of the present invention. In FIG. 1, A is a one-way clutch, and an outer race 1 attached to a rotating side such as a stator boss and an inner race 2 connected to a fixed side such as a case.
The sprags 20 arranged in the circumferential direction by the retainer 15 are interposed therebetween, and the sprags 20 are urged to rotate in the engaging direction by the garter spring 25, that is, rightward in FIG.

The retainer 15 is formed of a steel plate having a thickness of about 1 mm, for example, carbon tool steel (SK5). As shown in FIGS. Windows 16 are formed at equal pitches in the circumferential direction,
A pair of narrow receiving pieces 17 are provided at both circumferential edges of the window hole 16.
a and 17b are integrally formed. Each pair of receiving pieces 17a,
17b is formed at the center of the window hole 16 in the width (axial) direction, and is bent in a tapered shape toward the axial direction so that the axial side becomes a small gap. Each of these receiving pieces 17
The bending angles α of a and 17b are both about 30 degrees. Also,
Side flanges 18a and 18b projecting outward in the radial direction are integrally formed at both axial ends of the main body 15a.

As shown in FIG. 2, each of the sprags 20 is formed in a half-moon shape in a side view, and an arc portion on the inner peripheral side (axial side of the retainer 15) has a width in the arrangement direction of the sprags 20 (in FIG. The width (left and right widths) gradually decreases toward the axial direction of the retainer. Further, a groove 21 having a mountain shape in a side view is formed at the axial center portion on the outer peripheral side of each sprag 20.
Here, the interval L1 between the pair of receiving pieces 17a and 17b is slightly smaller than the maximum width of the gradually decreasing width portion 20a of the sprag 20, and the retainer 15 of the sprag 20 is formed.
The passage in the axial direction is prevented, and when the inner peripheral surface of the sprag 20 comes into contact with the outer peripheral surface 2a of the inner race 2, the tapered portion 20a is made to float from the pair of receiving pieces 17a, 17b.

Each of the sprags 20 is preliminarily attached to the retainer 1.
5 and the outer race 1 and the inner race 2
Incorporate between. That is, the sprags 20 are fitted into the respective window holes 16 of the retainer 15 from the outside in the radial direction, the ring-shaped garter springs 25 are fitted into the grooves 21 of the respective sprags 20, and the sprags 20 are fitted by the garter springs 25. 20 is the receiving piece 17a, 1 of the retainer 15.
7b, each sprag 20
And the retainer 15 as a unit, and are assembled between the outer race 1 and the inner race 2 in this state. In this case, if there is a margin in the clutch performance, the number of sprags 20 fitted in the window hole 16 is appropriately reduced, and
Minimize the use of. The garter spring 25 has a ring shape by connecting both ends of the coil spring.

FIGS. 7 to 9 show a second embodiment. This forms a gradually decreasing width portion 20b in the inner peripheral portion of the sprag 20 (the middle portion in the vertical direction in FIG. 7) in which the width of the sprags 20 in the arrangement direction gradually decreases in the axial direction of the retainer 15,
The tapered portion 1 of the retainer 15 described above is used for the tapered width portion 20b.
Face 7a, 17b. The relationship between the tapered width portion 20b and the receiving pieces 17a, 17b is the same as in the first embodiment described above, except that the interval between each pair of receiving pieces 17a, 17b is slightly smaller than the maximum width of the tapered width portion 20b. To prevent the sprags 20 from passing in the axial direction of the retainer 15, and the inner peripheral surface of the sprags 20
a, the tapered portion 20a floats from the pair of receiving pieces 17a and 17b. The other structure is substantially the same as that of the first embodiment.

According to the above embodiment, each sprag 20
Since the receiving pieces 17a and 17b of the retainer 15 prevent passage of the retainer 15 in the axial direction, the sprag 20
Is fitted into each window hole 16 of the retainer 15 from the outside in the radial direction, and the garter spring 25 is fitted into the groove 2 of each sprag 20.
1, the garter spring 25 and the receiving piece 1
The sprags 20 can be held between the inner race 2 and the outer race 1 by holding the sprags 20 between the inner race 2 and the outer race 1 by connecting the sprags 20 to the retainer 15. Further, the number of sprags 20 fitted into the window holes 16 can be reduced as appropriate to form a unit, which can be interposed between the inner race 2 and the outer race 1.

Each of the sprags 20 interposed between the inner race 2 and the outer race 1 has its inner peripheral surface in contact with the outer peripheral surface 2a of the inner race 2 to receive each of the receiving pieces 17a, 17a.
The sprags 20 are lifted radially outward from b, and each sprag 20 is allowed to rotate within the window hole 16 of the retainer 15, and the operation is performed smoothly. That is, in the rated torque state, as shown in FIGS. 2 and 8, the inner peripheral surface and the outer peripheral surface of each sprag 20 are frictionally engaged with the outer peripheral surface 2a of the inner race 2 and the inner peripheral surface 1a of the outer race 1. In the lift-off state, as shown in FIGS. 3 and 9, the flat portion formed on the outer peripheral side of each sprag 20 comes into contact with the inner peripheral surface 1a of the outer race 1 so that the sprags 20 rotate inadvertently. And the inner peripheral surface of each sprag 20 is separated from the outer peripheral surface 2a of the inner race 2 to prevent wear of the outer peripheral surface 2a of the inner race 2 and the inner peripheral surface of the sprag 20.

[0015]

As is apparent from the above description, the present invention has a simplified structure, a reduced number of parts, and an increased productivity. Also, during assembly, the sprags are latched to the receiving piece and held in the retainer, and after the sprag are lifted off the receiving piece after assembly, the assembly is easy and the operation of the sprag after assembly is easy. Become smooth. Further, since the number of sprags fitted into the window hole of the retainer can be appropriately selected, it is possible to obtain a one-way clutch corresponding to the clutch performance.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional side view showing an operation state at a rated torque in the first embodiment.

FIG. 3 is an enlarged sectional side view showing an operation state at the time of lift-off in the first embodiment.

FIG. 4 is a partial cross-sectional side view of a retainer according to the first embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a plan view of a main part of FIG. 4;

FIG. 7 is a sectional side view of a main part showing a second embodiment of the present invention.

FIG. 8 is an enlarged sectional side view showing an operation state at a rated torque in the second embodiment.

FIG. 9 is an enlarged sectional side view showing an operation state at the time of lift-off in the second embodiment.

FIG. 10 is a sectional front view of a main part showing a first example of a conventional example.

11 is a partial cross-sectional side view of FIG.

FIG. 12 is a sectional front view of a main part showing a second example of the conventional example.

[Explanation of symbols]

 A one-way clutch 1 outer race 1a inner peripheral surface 2 inner race 2a outer peripheral surface 15 retainer 15a main body 16 window hole 17a, 17b receiving piece 20 sprag 20a, 20b gradually decreasing width portion 21 groove 25 garter spring

Claims (2)

[Claims] 1. A retainer having a cylindrical main body having a plurality of window holes formed at a predetermined pitch in a circumferential direction, and rotatably fitted to each of the window holes of the retainer and arranged in the circumferential direction. In the one-way clutch having a large number of sprags, each sprag is provided with a gradually decreasing width portion in which the width in the arrangement direction of the sprags gradually decreases in the axial direction of the retainer. A pair of receiving pieces protruding in the approaching direction are provided in a part thereof, the distance between the pair of receiving pieces is slightly smaller than the maximum width of the gradually decreasing width portion, and the sprags are retained from outside in the radial direction. A one-way clutch, wherein said one-way clutch is fitted in said window hole and a gradually decreasing width portion thereof faces said pair of receiving pieces. 2. The one-way clutch according to claim 1, wherein each of said pair of receiving pieces is formed in a tapered shape gradually approaching in an axial direction of a retainer.