JP3427326B2 - 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 used in, for example, an automatic transmission of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a one-way clutch of this type, as shown in FIG. 7, an outer ring 71 having a convex portion and a concave portion on the outer periphery for spline fitting with the concave portion and the convex portion of a housing 70.
An inner ring 72, a plurality of engaging members 73 arranged between the inner ring 72 and the outer ring 71, a retainer 74 holding each of the engaging members 73, and the engaging members 73 in one direction. Springs 75 for urging the outer ring 71, end bearings 76 arranged on both sides between the inner ring 72 and the outer ring 71, and retainer washers 77 mounted on both side faces of the outer ring 71 for suppressing axial movement of the engaging member 73. The one provided with and is proposed (see Japanese Utility Model Laid-Open No. 4-88728).

An attaching portion 77a of the retainer washer 77 to the outer ring 71 is located inside the housing recess 70a. Further, a spring portion 78 protruding in the axial direction is formed on the outer peripheral edge portion of the retainer washer 77, and the spring force of the spring portion 78 presses the outer ring 71 against the snap ring 79, whereby the outer ring 71 moves about the axis. Is restrained to prevent the outer ring 71 from swinging around when the inner ring 72 changes its rotation direction, thereby preventing the rattling noise generated when the convex portion of the housing 70 hits the convex portion (teeth) of the outer ring 71. I try to prevent it.

[0004]

By the way, in such a one-way clutch, a friction torque Tm is generated in accordance with the axial load force of the spring portion 78, and the friction torque Tm, the lock torque Tr, and the idling torque Tf are generated. Since Tm <Tr and Tm> Tf, respectively, the outer ring 71 of the outer ring 71 in the operating state of the one-way clutch is, as shown in FIG. The position of the outer ring 71 is kept in contact with the inner ring 72 and the rotation of the outer ring 71 when the inner ring 72 changes its rotation direction to the idling side F is suppressed. However, when the lock torque is applied, the contact surfaces of the housing 70 and the outer ring 71 are slightly elastically deformed in reality, and therefore, the outer ring is slightly circled due to repeated locking and idling of the inner ring. Is swinging in the direction. At this time, since the outer wheel moving speed to the lock side R is faster than the outer wheel moving speed to the idling side F, the retainer washer 77 moves integrally with the outer wheel when the outer ring 71 moves to the idling side F. Although the position does not shift, it cannot follow the movement of the outer ring 71 to the lock side R, and the outer ring 71
Relative to the inner ring idling side F, the mounting portion 77a of the retainer washer 77 comes into contact with the circumferential side surface 70c of the housing recess 70a on the inner ring idling side as shown in FIG. It turns out that it may hurt. As described above, when the housing recess 70a is scratched, abrasion powder is generated, and this abrasion powder may hinder the automatic shifting operation of the automatic transmission, for example. This is especially likely to be a problem when the housing 70 is made of a light alloy such as an aluminum alloy.

Therefore, an object of the present invention is to provide a one-way clutch in which the retainer washer does not move in the idling direction of the inner ring due to the lock and idling operation of the one-way clutch.

[0006]

To achieve the above object, according to an aspect of an outer ring having the outer circumferential convex and concave portions which splined to concave and convex portions provided in the housing, an inner ring, a the inner ring and the outer ring A plurality of engaging members arranged between the,
A one-way clutch, comprising: a retainer washer that suppresses axial movement of the engaging member that is mounted by mounting portions so as to be located on both side surfaces of the outer ring, wherein the mounting portion of the at least one retainer washer is the housing recess. while located within the relative rotation between the outer ring at a stopper portion provided in the outer ring convex portion so as not to move in the idle direction of the inner ring is limited, the inner ring idling direction side of the retainer washer and the housing recess It is characterized in that it is not in contact with the circumferential wall surface. The stopper portion is formed by a protrusion formed on the outer peripheral surface of the outer ring convex portion to which the retainer washer mounting portion is mounted. Furthermore, the stopper portion in the axial direction within the groove formed in the convex portion of the outer ring
It is constructed by mounting the mounting portion of the retainer washer. Furthermore, the stopper section fitting the axial bent portion in the axial direction groove formed at a distance from each other in the mounting portion and the circumferential direction of the retail <br/> Nawassha formed in the convex portion of the outer ring It is configured by

[0007]

In the one-way clutch configured as described above, even if the retainer washer tries to move in the idling direction of the inner ring when the lock and idling operations are repeated, the stopper portion prevents the retainer washer from moving, so that the retainer washer and the housing are Contact is prevented.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIGS. 1 to 4A and 4B show a first embodiment of the one-way clutch of the present invention. In this embodiment, the outer ring 1, the inner ring 2, the engaging member 3, the retainer 4, the spring 8, the pair of end bearings 5, 5 and the pair of retainer washers 6, 6.
It is basically composed of 7.

The outer ring 1 has an axially thick inner peripheral portion,
A step portion 20 is formed which has an outer peripheral portion which is thin in the axial direction and which has a mounting groove 1b on the outer periphery. Further, on the outer peripheral surface of the outer ring 1, a plurality of convex portions 1a are formed on the circumference. The mounting groove 1 is provided on one side of the outer peripheral surface of the convex portion 1a in the axial direction.
c is formed. Between the inner ring 2 and the outer ring 1,
A plurality of engagement members 3, a retainer 4 that holds each engagement member 3, and a spring 8 that biases each engagement member 3 in one direction are arranged, and the inner ring 2 and the outer ring 1 are arranged. End bearings 5 and 5 are arranged at positions on both sides between and.

On the other hand, the retainer washer 6 is integrally formed at its outer peripheral edge with a mounting portion 6a which engages with the mounting groove 1c and is mounted on the outer ring 1. Similarly, the retainer washer 7 is also integrally formed at its outer peripheral edge with a mounting portion 7a that engages with the mounting groove 1b and is mounted on the outer race 1. As a result, the retainer washers 6 and 7 are attached to the side surfaces of the outer ring to suppress the axial movement of the engaging member 3. A spring portion 7b is provided on the outer peripheral edge of the retainer washer 7 to exert a frictional force between the housing 9 and the outer ring 1. The action of the spring portion 7b will be described later, but is well known in the art.

The housing 9 is formed with a concave portion 9a into which the convex portion 1a of the outer ring 1 is spline fitted. The housing 9 is formed with a step portion 21 facing the one retainer washer 7 and a snap ring 10 facing the other retainer washer 6 is attached. A snap ring may be attached instead of the step 21,
In this case, the snap ring is considered part of the housing.

The spring portion 7b is a step portion 21 of the housing.
The outer ring 1 is brought into contact with the snap ring 10 by its spring force.
Can be pressed against. Therefore, due to the spring force, the outer ring 1
Since a frictional force acts between the outer ring 1 and the housing 9 to restrain the movement of the outer ring 1 around its axis, the outer ring 1 is prevented from swinging around when the inner ring 2 changes its rotation direction to the idling direction.
It is possible to prevent the rattling noise generated by the concave portion 9a of the outer ring 1 hitting the convex portion 1a of the outer ring 1.

The mounting portion 6a of the one retainer washer 6 is located in the recess 9a when the projection 1a of the outer ring 1 is fitted in the recess 9a of the housing 9. The mounting portion 7a of the other retainer washer 7 has the recess 9
Although not located in a, the stepped portion 20 of the outer ring 1 may be omitted if necessary, and the structure may be the same as the mounting portion structure on the retainer washer 6 side. In this case, the mounting portion is located inside the recess 9a.

Further, in the vicinity of the mounting portion 6a of the retainer washer 6 and on the idling direction side of the inner ring 2, a projection 11 protruding radially outward is formed on the outer peripheral surface 1b of the end portion of the mounting groove 1a of the outer ring 1. Thus, the mounting portion 6a serves as a stopper portion S so as not to move in the inner ring idling direction F. As can be understood from FIGS. 4A and 4B for details of the protrusion 11, the side face 1b of the outer ring 1 is appropriately pressed with a tool, for example, a spherical tool to form the recess 12 by plastic deformation, and the amount of plastic deformation is Is bulged outward in the radial direction to form a protrusion 11.
This prevents movement of the mounting portion 6a of the retainer washer 6 in the idling direction F of the inner ring, so that the housing 9
Since the recess 9a is not in contact with the circumferential wall surface 9b on the inner ring idling direction side, the problem of scratching the recess 9a of the housing 9 does not occur. If necessary, this protrusion 11 may also be formed on the locking direction side R of the inner ring 2 in the same manner. By forming the protrusions 11 on both sides of the mounting portion 6a in this way, the positioning of the mounting portion 6a becomes easy.

Further, FIGS. 5A and 5B show another second embodiment in which an axial groove 13 is formed in the central portion of the convex portion 1a of the outer ring 1 and the mounting portion of the retainer washer 6 is formed in this groove 13. A mounting groove 1c for mounting 6a is formed. With this structure, the mounting portion 6a can be easily positioned.

Further, FIGS. 6A, 6B and 6C show another third embodiment in which the mounting groove 1 formed in the convex portion 1a of the outer ring 1 is mounted.
c is the same as that of the first embodiment of FIG. 1, but an axial groove 14 is formed at an appropriate position of the convex portion 1a, and a retainer washer 6 is fitted with an ear portion 6b formed separately from the mounting portion 6a. It is a thing.

Although the structure of the stopper portion S has been described in the first to third embodiments, it is not limited to this, and for example, although not shown, the retainer washer 6 may be welded. Is. Further, although the stopper portion on the one side of the retainer washer 6 has been described, as described above, when the mounting portion 7a of the other retainer washer 7 is located in the recess 9a of the housing 9 like the retainer washer 6, as described above. It goes without saying that the above-mentioned structure of the stopper portion will be adopted.

[0019]

Since the one-way clutch according to the present invention is constructed as described above in detail, the retainer washer mounting portion is moved in the inner ring idling direction by the slight swing of the outer ring when switching the inner ring lock and idling. As a result, the concave portion of the housing is not scratched and abrasion powder is prevented from being generated.

[Brief description of drawings]

FIG. 1 is a front view of a one-way clutch according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the AA cross section of FIG.

3 is a partially enlarged cross-sectional view of a main part of FIG.

4A is an enlarged view of a main part of the outer ring of FIG. 1, and FIG. 4B is a sectional view taken along line AA of FIG.

5A is a front view of a one-way clutch according to a second embodiment of the present invention, and FIG. 5B is a sectional view taken along line AA of FIG.

6A is a front view of a one-way clutch according to a third embodiment of the present invention, FIG. 6B is a sectional view taken along line AA of FIG. 6A, and FIG. 6C is a sectional view taken along line BB of FIG. Is.

FIG. 7 is a sectional view of a conventional one-way clutch.

8A is a diagram showing the normal position of the retainer washer of the one-way clutch in FIG. 7, and FIG. 8B is a diagram showing the displaced position of the retainer washer during repeated locking and idling of the one-way clutch in FIG. It is a figure.

[Explanation of symbols]

1 outer ring 2 inner ring 3 Engagement member 6,7 Retainer washer 6a, 7a mounting part 9 housing 9a Housing recess 9b Circumferential wall S stopper part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Actual flat 4-88728 (JP, U) Actual flat 6-18735 (JP, U) Actual flat 6-35683 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16D 41/00-41/36

Claims (4)

(57) [Claims] And 1. A outer ring having the outer circumferential convex and concave portions which splined to concave and convex portions provided in the housing, inner ring and a plurality of engagement members disposed between the inner ring and the outer ring And a retainer washer that suppresses the axial movement of the engaging member that is attached by the attaching portion so as to be located on both sides of the outer ring, the attaching portion of the at least one retainer washer is the above-mentioned. while positioned in the housing recess, the relative rotation between the outer ring at the <br/> so as not to move the inner ring idling direction the outer ring protrusion on the stopper part provided is limited, the retainer washer and the housing recess A one-way clutch, characterized in that the inner ring of the inner ring is not in contact with the circumferential wall surface on the idling direction side. 2. The one-way according to claim 1, wherein the stopper portion is constituted by a protrusion formed on a mounting outer peripheral surface of the outer ring convex portion to which the mounting portion of the retainer washer is mounted. clutch. Wherein said stopper unit is one according to claim 1, characterized in that it is constituted by mounting the mounting portion of the retainer washer axially in grooves formed in the convex portion of the outer ring Directional clutch. Wherein said stopper portion, fitting the axial bent portion formed at a distance from each other in the mounting portion and the circumferential direction of the retainer washer axially in grooves formed in the convex portion of the outer ring The one-way clutch according to claim 1, which is configured by: