JPH09112596A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exercise the sprag energizing function of a spring sufficiently, and to prevent the hanging down of the spring, and to facilitate the assembling. SOLUTION: In this one-way clutch, plural sprags 3 fitting to a holder 5 are provided in the peripheral direction placing specific intervals, between an inner ring 1 and an outer ring 2, and the sprags 3 are energized in the erecting direction by a spring 6, inside the holder 5 in the diameter direction. A retainer washer 7 is fixed being engaged to the step at the shaft end of the outer ring 2, and it has a bending part 16 projecting to the inner side in the axial direction from the inner end in the diameter direction. This bending part 16 supports the spring 6 from the inner side in the diameter direction to the outer side in the diameter direction.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a one-way clutch.

[0002]

2. Description of the Related Art Conventionally, a one-way clutch has an inner ring 41, an outer ring 42, and a plurality of sprags 43, as shown in FIGS. A bush 46 is fitted and fixed to the thick portion 42A of the outer ring 42, and the inner ring 41 is in sliding contact with the bush 46. The plurality of sprags 43 are held by a ring-shaped single retainer 45, and the thin portion 42B of the outer ring 42 and the inner ring 4 are held.
It is arranged at a predetermined interval in the circumferential direction between the first and second parts. Further, the ring-shaped spring 4 which is in contact with the cage 45 is radially inward of the one-sheet cage 45.
7 are arranged, the spring 47 is fitted to the plurality of sprags 43, and the sprags 43 are attached to the inner ring 4
1 and the outer ring 42 in the engaging direction. An axial end portion 42B-1 of the thin portion 42B of the outer ring 42 has a step portion 50.
A ring-shaped retainer washer 48 is fitted to the. The retainer washer 48 supports the retainer 45 in the axial direction and prevents the retainer 45, the sprag 43, and the spring 47 from being displaced in the axially outward direction.

In this one-way clutch, the inner ring 41 is the outer ring 4
When rotated in the direction of arrow X shown in FIG. 3 with respect to 2, the sprag 43 is in a standing posture and engages with the inner ring 41 and the outer ring 42, and the sprag 43 transmits the rotational force of the inner ring 41 to the outer ring 42.

The one-way clutch is assembled as follows. First, the spring 47 is fitted to the cage 45, and then the sprag 43 is fitted to the spring 47. Next, the retainer 45, the sprag 43, and the spring 47 are attached to the outer ring 42, and the retainer washer 48 is fitted to the outer ring 42. Next, the inner ring 41 is fitted inside the sprag 43 in the radial direction.

[0005]

However, in the above-described conventional one-way clutch, the inner ring 41 is slid in the axial direction at the time of assembly so that the inner ring 4 is radially inward of the sprag 43.
As shown in FIG. 4, when fitting 1 with each other, the overlapped portion of the ends of the strip-shaped spring 47 may hang radially inward due to gravity, which may interfere with the fitting of the inner ring 41. There is.

Further, even after the assembly, when the spring 47 hangs down, the position of the claw 47A of the spring 47 is lowered, and the claw 47A does not contact the sprag 43 at the proper position. Then, the spring 47 causes the sprag 4 to move.
There is a problem that the function of urging 3 in the standing direction is impaired.

Therefore, an object of the present invention is to provide a one-way clutch which can prevent the spring from hanging down, is easy to assemble, and can sufficiently exert the sprag urging function of the spring.

[0008]

In order to achieve the above object, the invention according to claim 1 provides an inner ring, an outer ring, and a single cage between the inner ring and the outer ring so that a predetermined interval is provided in the circumferential direction. Mounted on the outer ring, a sprag arranged open, a spring for biasing the sprag in the meshing direction,
In a one-way clutch having the retainer and a retainer washer arranged on a side surface of a spring, the retainer washer includes a support portion for supporting the spring from a radially inner side to a radially outer side in an inner diameter portion. It is characterized by being.

According to the invention of claim 1, since the support portion of the retainer washer supports the spring from the radially inner side to the radially outer side, it is possible to prevent the spring from hanging down during assembly. Therefore, according to the present invention, the assembly becomes easy.

Further, even after the assembling, the supporting portion of the retainer washer supports the spring from the radially inner side to the radially outer side, so that the spring can be brought into contact with the sprag at the regular position. Therefore, the sprag urging function of the spring can be sufficiently exerted.

The invention according to claim 2 is characterized in that, in the one-way clutch according to claim 1, the support portion of the retainer washer is a bent portion protruding in the axial direction.

Therefore, according to the second aspect of the present invention, the bent portion can support the spring from the radially inner side to the radially outer side to prevent the spring from hanging down. Further, when the supporting portion is a bent portion of the retainer washer, it can be manufactured easily and at low cost.

The invention according to claim 3 is the one-way clutch according to claim 2, characterized in that the bent portion is continuous in the circumferential direction of the retainer washer.

Therefore, according to the third aspect of the invention, since the bent portion is continuous in the circumferential direction, it is possible to prevent the spring from hanging down over the entire circumferential direction. Moreover, it is possible to prevent the spring from being caught in the bent portion. In addition, since the bent portion also plays a role of guiding the spring in the circumferential direction, the spring can be smoothly moved in the circumferential direction.

[0015] The invention of claim 4 is the invention of claims 1 to 3
In the one-way clutch described in any one of 1, the retainer washer is made of a material having a self-lubricating property, and the support portion constitutes a slide bearing.

Therefore, according to the invention of claim 4, when the outer ring is tilted with respect to the inner ring, the supporting portion of the retainer washer is slid while being in contact with the outer peripheral surface of the inner ring, so that the outer ring is radially moved with respect to the inner ring. Can be supported in any direction. Therefore, the support portion can prevent the spring and the inner ring from coming into contact with each other at the time of the inclination, and can prevent the spring from being damaged.

Further, the invention of claim 5 relates to claims 1 to 4.
The one-way clutch described in any one of 1 to 3, wherein at least the inner peripheral surface of the support portion of the retainer washer is coated with a self-lubricating agent.

Therefore, according to the invention of claim 5, when the outer ring is inclined with respect to the inner ring, the inner peripheral surface of the support portion of the retainer washer is brought into contact with the outer peripheral surface of the inner ring while being smoothed by the self-lubricating agent. Can be slipped on. Therefore, when the outer ring is inclined with respect to the inner ring, the retainer washer supports the outer ring with respect to the inner ring, and it is possible to prevent the inner ring and the outer ring from pressing the sprag, the cage, and the spring in the radial direction.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows a cross section of an embodiment of the one-way clutch of the present invention. This one-way clutch includes an inner ring 1, an outer ring 2, a sprag 3, a cage 5, a spring 6, a retainer washer 7, and a bush 8.

The outer ring 2 has a thick portion 2A and a thin portion 2B. The bush 8 is fitted and fixed to the thick portion 2A of the outer ring 2, and the inner ring 1 is in sliding contact with the bush 8. The sprag 3, the cage 5, and the spring 6 are arranged between the thin portion 2B of the outer ring 2 and the inner ring 1. The retainer 5 has an annular shape, and has a plurality of holes 10 formed at predetermined intervals in the circumferential direction. The sprag 3 is fitted into the hole 10. The cage 5 has two support portions 11 and 12 extending radially outward from both ends in the axial direction. The radial outer ends of the support portions 11 and 12 come into contact with the inner peripheral surface of the thin portion 2B of the outer ring 2 and serve to determine the radial position of the cage 5.

The spring 6 has the same annular shape as the retainer 5, and has a plurality of holes 13 formed at predetermined intervals in the circumferential direction. The spring 6 is arranged radially inside the cage 5 so that the sprag 3 fits into the hole 13.

Further, the retainer washer 7 has a corrugated curved engaging portion 15 which engages with a step portion 14 formed at the axial end portion 2B-1 of the thin portion 2B of the outer ring 2. Further, the retainer washer 7 has a bent portion 16 which is bent inward in the axial direction at the inner end in the radial direction and projects in the axial direction. The bent portion 16 has an annular shape and is continuous in the circumferential direction. The bent portion 16 supports the spring 6 from the radially inner side to the radially outer side.

The retainer washer 7 is made of phosphor bronze as a self-lubricating material. The inner peripheral surface 16A of the bent portion 16 of the retainer washer 7 is coated with a soft metal as a self-lubricant, for example, lead.

In the one-way clutch having the above structure, when the inner ring 1 rotates in one direction perpendicular to the paper surface with respect to the outer ring 2, the sprag 3 tilts in the standing direction and strongly presses the inner ring 1 and the outer ring 2. The rotating force of the inner ring 1 by the wedge action
To communicate. On the other hand, when the inner ring 1 rotates in the other direction perpendicular to the paper surface with respect to the outer ring 2, the sprag 3 tilts in the tilting direction and the wedge action is released.

Next, a method for assembling the one-side clutch will be described. First, the spring 6 is fitted into the cage 5, and then the sprag 3 is fitted into the spring 6. Next, the retainer 5, the sprag 3, and the spring 6 are attached to the outer ring 2
Then, the retainer washer 7 is fitted to the outer ring 2 to which the bush 8 is fitted. Next, the inner ring 41 is fitted inside the sprag 3 in the radial direction.

In the one-way clutch, the bent portion 16 as a support portion of the retainer washer 7 supports the spring 6 from the radially inner side to the radially outer side. It can be prevented from hanging down. Therefore, when the inner ring 1 is slid in the axial direction to fit the inner ring 1 inside the sprag 3 in the radial direction, the spring 6 does not interfere with the axial movement of the inner ring 1. Therefore, this one-way clutch facilitates assembly.

Even after the above assembly, the bent portion 16 of the retainer washer 7 supports the spring 6 from the radially inner side to the radially outer side.
Can be brought into contact with the sprag 3 at the regular position. Therefore, the sprag urging function of the spring 6 can be sufficiently exerted, and the clutch function can be sufficiently exerted. Also, the bent portion 16 of the retainer washer 7
Since the support part is configured by, the support part can be manufactured easily and inexpensively.

Further, since the bent portion 16 is continuous in the circumferential direction, it is possible to prevent the spring 6 from hanging down over the entire circumferential direction. In addition, since the bent portion 16 does not catch on the spring 6, and the bent portion 16 also plays a role of guiding the spring 6 in the circumferential direction, it is possible to smoothly move the spring 6 in the circumferential direction. it can.

Further, in this one-way clutch, the retainer washer 7 is made of phosphor bronze as a material having self-lubricating property, and the bent portion 16 constitutes a slide bearing. Therefore, when the outer ring 2 is inclined with respect to the inner ring 1, the bent portion 16 of the retainer washer 7 is slid while being in contact with the outer peripheral surface of the inner ring 1 to support the outer ring 2 in the radial direction with respect to the inner ring 1. be able to. Therefore, the bent portion 16 can prevent the spring 6 and the inner ring 1 from coming into contact with each other at the time of the inclination, and can prevent the spring 6 from being damaged.

In this one-way clutch, the inner peripheral surface 16A of the bent portion 16 of the retainer washer 7 is coated with a soft metal such as lead as a self-lubricant. Therefore, when the outer ring 2 is inclined with respect to the inner ring 1, the inner peripheral surface 16A of the bent portion 16 of the retainer washer 7 is brought into contact with the outer peripheral surface 1A of the inner ring 1 while being smoothly slid with the lead coating. You can Therefore, when the outer ring 2 is inclined with respect to the inner ring 1, the retainer washer 7 can support the outer ring 2 while rotating the outer ring 2 with respect to the inner ring 1, and the inner ring 1 and the outer ring 2 can support the sprag 3, the cage 5, and the spring 6. It is possible to prevent pressure in the radial direction.

In the above embodiment, the retainer washer 7 is made of phosphor bronze, and the inner peripheral surface 16A of the bent portion is formed.
Is coated with a soft metal as a self-lubricating agent, for example, lead, but the retainer washer 7 is made of steel and the inner peripheral surface 16A of the bent portion 16 of the retainer washer 7 is made of the soft metal,
For example, even when lead coating is performed, the inner ring 1 can be slid along the inner peripheral surface 16A of the bent portion 16 to protect the spring 6. In this case, the cost can be reduced.

Further, in the above embodiment, the sprag 3 is constituted by the thick portion 2A of the outer ring 2 and the retainer washer 7,
Although it is supported from both sides in the axial direction, another retainer washer having the same shape as the retainer washer 7 may be provided instead of the thick portion 2A.

[0034]

As is apparent from the above, in the one-way clutch of the first aspect of the invention, the retainer washer is provided with the support portion for supporting the spring from the radially inner side to the radially outer side in the inner diameter portion. There is.

Therefore, according to the first aspect of the present invention, since the support portion of the retainer washer supports the spring from the radially inner side to the radially outer side, it is possible to prevent the spring from hanging down during assembly. Therefore, according to the present invention, the assembly becomes easy.

Further, even after the assembling, the supporting portion of the retainer washer supports the spring from the radially inner side to the radially outer side, so that the spring can be brought into contact with the sprag at the regular position. Therefore, the sprag urging function of the spring can be sufficiently exerted, and the clutch function can be sufficiently exerted.

According to a second aspect of the present invention, in the one-way clutch according to the first aspect, the support portion of the retainer washer is a bent portion that is bent inward in the axial direction and protrudes in the axial direction.

Therefore, according to the second aspect of the present invention, the bent portion can support the spring from the radially inner side to the radially outer side to prevent the spring from hanging down. Further, when the supporting portion is a bent portion of the retainer washer, the supporting portion can be manufactured easily and at low cost.

According to a third aspect of the present invention, in the one-way clutch according to the second aspect, the bent portion is continuous in the circumferential direction.

Therefore, according to the third aspect of the invention, it is possible to prevent the spring from hanging down over the entire circumference. Further, since the bent portion can be prevented from being caught by the spring and the bent portion also plays a role of guiding the spring in the circumferential direction, it is possible to smoothly move the spring in the circumferential direction. .

Further, the invention of claim 4 is based on claims 1 to 3.
In the one-way clutch described in any one of 1, the retainer washer is made of a material having a self-lubricating property, and the support portion constitutes a slide bearing.

Therefore, according to the fourth aspect of the present invention, when the outer ring is inclined with respect to the inner ring, the supporting portion of the retainer washer is slid while making contact with the outer peripheral surface of the inner ring, so that the outer ring is radiated with respect to the inner ring. Can be supported in any direction. Therefore, the support portion can prevent the spring and the inner ring from coming into contact with each other at the time of the inclination, and can prevent the spring from being damaged.

Further, the invention of claim 5 relates to claims 1 to 4.
In the one-way clutch described in any one of the above 1, at least the inner peripheral surface of the support portion of the retainer washer is coated with a self-lubricating agent.

Therefore, according to the fifth aspect of the present invention, when the outer ring is inclined with respect to the inner ring, the inner peripheral surface of the supporting portion of the retainer washer is brought into contact with the outer peripheral surface of the inner ring while being smoothed by the self-lubricating agent. Can be slipped on. Therefore, when the outer ring is inclined with respect to the inner ring, the retainer washer supports the outer ring while rotating it with respect to the inner ring, and it is possible to prevent the inner ring and the outer ring from compressing the sprag, the cage, and the spring in the radial direction. .

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a conventional one-way clutch.

FIG. 3 is a partially cutaway cross-sectional view showing a state in which the above conventional example is viewed from the axial direction.

FIG. 4 is a diagram showing a state in which the spring of the conventional example is hanging down.

[Explanation of symbols]

1 ... inner ring, 1A ... outer peripheral surface, 2 ... outer ring, 2A ... thick part, 2
B ... Thin portion, 3 ... Sprag, 5 ... Retainer, 6 ... Spring, 7 ... Retainer washer, 8 ... Bushing, 10 ... Hole,
11, 12 ... Supporting portion, 13 ... Hole, 14 ... Step portion, 15 ... Corrugated curved engaging portion, 16 ... Bending portion, 16A ... Inner peripheral surface.

Claims (5)

[Claims] 1. An inner ring, an outer ring, a sprag which is arranged between the inner ring and the outer ring at a predetermined interval in the circumferential direction by a single cage, and a spring which biases the sprag in a meshing direction. And a retainer washer attached to the outer ring and arranged on the side surface of the retainer and the spring, wherein the retainer washer has an inner diameter portion in which the spring is radially inward to radially outward. A one-way clutch, which is provided with a support portion that supports the one-way clutch. 2. The one-way clutch according to claim 1, wherein the support portion of the retainer washer is a bent portion that projects in the axial direction. 3. The one-way clutch according to claim 2, wherein the bent portion is continuous in a circumferential direction of the retainer washer. 4. The one-way clutch according to any one of claims 1 to 3, wherein the retainer washer is made of a material having self-lubricating property, and the supporting portion constitutes a slide bearing. A one-way clutch characterized by that. 5. The one-way clutch according to claim 1, wherein at least an inner peripheral surface of a support portion of the retainer washer is coated with a self-lubricating agent. clutch.