JPH11117955A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way clutch to simply mount a one-way clutch to be simply mounted between inner and outer wheels without limiting the structure and the mounting direction of a mounting mate and be constrained by an axial direction as it is. SOLUTION: A holder 15 formed of an elastic deformable material comprises a cylinder part 18; and a flange 17. A small part 172 and an approximately extending elastic deformable tongue piece 171 and an approximately peripherally extending elastically deformable tongue piece 171 are formed on one and the same plane. A flange support groove 23 having diameter larger than the diameter of the small part 172 of the flange 17 and smaller than that of the tongue piece 171 is formed in an outer wheel 21. When the tongue piece 171 is bent and moved to the position of the flange support groove 23, since the tongue piece 171 tries to be restored to an original shape and fitted in a flange fit-in groove 23, the one way clutch 10 is axially constrained in the position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprag type one-way clutch which is incorporated between a drive shaft and a driven shaft of an automobile, a general industrial machine or the like and transmits only the power of one-way rotation of the drive shaft to the driven shaft. Belongs to the technical field.

[0002]

2. Description of the Related Art A sprag-type one-way clutch is incorporated between a drive shaft and a driven shaft, and transmits a rotational force from the drive shaft to the driven shaft through a sprag between an outer ring and an inner ring. Things. When a rotational force in a certain direction is applied to the sprags from the drive shaft, the sprags are bitten between the outer ring and the inner ring, and torque is transmitted to the driven shaft. There is no biting between the outer wheel and the inner wheel, and no torque is transmitted between the drive shaft and the driven shaft.

FIG. 3 shows an example of such a clutch.
4 is shown. This one-way clutch 40
The vehicle includes a plurality of sprags 43 that are engaged between the outer race 41 and the inner race 42 and a retainer 45 that is interposed between the outer race 41 and the inner race 42 and holds the sprags 43. As shown in FIG. 4, the retainer 45 includes a cylindrical portion 48 in which the holding hole 44 of the sprag 43 is formed, and an elliptical flange 47 having a short diameter portion A and a long diameter portion B. I have.

[0004] A ring-shaped spring 46 is previously mounted on the cylindrical portion 48 of the retainer 45, and the sprag 43 is inserted into the holding hole 44 of the cylindrical portion 48, and is inserted into a spring receiving groove formed in the sprag 43. When the spring 46 is fitted, the sprag 43 is held in the holding hole 44 by the pressing force of the spring 46. Thus, the plurality of sprags 43 are mounted on the retainer 45 to form the one-way clutch 40.

After the plurality of sprags 43 are mounted on the retainer 45, the one-way clutch is provided between the outer race 41 and the inner race 42 so that the inner race 42 is positioned inside the cage 45 and the outer race 41 is positioned outside. 40 is incorporated (see FIG. 3). Since the flange 47 of the retainer 45 is formed in an oval shape having the long diameter portion B and the short diameter portion A, the circular counterbore hole 50 formed in the side of the outer ring 41 when the clutch 40 is assembled.
Is pressed into contact with the counterbore 5
0, the outer ring 42 and the one-way clutch 40 are fixed.

In the conventional one-way clutch, the outer race 4
Some bearings for supporting the inner ring 1 and the inner ring 42 include a block bearing (not shown) between the outer ring 41 and the inner ring 42.

[0007]

The one-way clutch 4
0 can be attached only when it has a counterbore 50 formed on the side of the outer ring 41. In addition, there is nothing in the axial direction that restricts the mounting state.
The one-way clutch 40 must be restrained in the axial direction by sandwiching the one-way clutch 40 between the first part and the mating part and fastening the one-way clutch 40 with a bolt 60 or the like. In addition, since the clutch 40 must always be inserted into the mounting opening from the side of the cylindrical portion 48 having a small diameter, the operating direction of the one-way clutch 40 to be mounted is necessarily limited.

[0008]

SUMMARY OF THE INVENTION The present invention provides a one-way clutch comprising a retainer for retaining a sprag interposed between an outer ring and an inner ring, wherein the retainer has a flange at one end and a retaining hole for the sprag. The flange has a plurality of elastically deformable tongues extending substantially in the circumferential direction, and the tongues elastically deform the flange receiving grooves formed in the outer ring. The above-mentioned problem has been solved by a one-way clutch characterized in that the clutch is used and incorporated and is fixed in the axial direction.

The outer diameter of the tongue piece is formed slightly larger than the diameter of the flange receiving groove.
When the flange is incorporated into the flange receiving groove, if the tongue piece is configured to generate a drag torque by the outer ring, the one-way clutch is dragged and held by the outer ring at the time of non-wedge engagement. As the bowl rotates, the occurrence of slip between the outer race and the sprags is prevented.

When the tongue is formed on the same plane as the flange, it is easy to form the tongue by pressing.

Since the tongue of the retainer is required to be easily elastically deformed, the material is preferably a metal or a synthetic resin.

[0012]

The outer ring is formed with a flange receiving groove into which the tongue of the flange of the one-way clutch of the present invention is pushed by utilizing its elastic deformation. When the one-way clutch of the present invention is mounted between the outer ring and the inner ring, the tongue of the flange of the retainer is flexed in a direction to reduce its diameter by utilizing its elastic deformation, so that a gap between the outer ring and the inner ring is formed. When the tongue of the flange reaches the flange receiving groove formed on the outer ring,
The tongue of the flange, which has been bent by the elastic deformation, tries to return to its original shape, and engages with a groove formed in the outer ring. The depth of the flange receiving groove of the outer ring is set to such a value that the flange does not come off in a normal operation state in relation to the outer diameter of the tongue piece of the flange.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A one-way clutch 10 according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1A is a front view of a state in which the one-way clutch 10 is mounted between an outer race 21 and an inner race 22, and FIG. 1B is a longitudinal sectional view taken along the line bb of FIG. 1A. . This one-way clutch 10 has an outer ring 2
Plural sprags 13 bitten between the inner ring 22 and the inner ring 22
And a retainer 15 interposed between the outer ring 21 and the inner ring 22 to hold the sprag 13.

FIG. 2A is a front view of a retainer 15 used in the one-way clutch 10, and FIG. 2B is FIG. 2A.
1 shows a vertical cross-sectional view taken along line bb of FIG. The retainer 15 is formed of, for example, metal or a synthetic resin such as engineering plastic so as to be easily elastically deformed, and includes a flange 17 extending in the radial direction as in the conventional case, and a cylindrical portion 18. I have. The cylindrical portion 18 of the retainer 15 has a sprag 1
The holding holes 181 for receiving and holding 3 are formed at six places.

On the flange 17 of the retainer 15, three tongue pieces 171 are formed at equal intervals. This tongue piece 171
Extends substantially in the circumferential direction along the outer circumference of the flange 17, and is formed so that the outer diameter of the tongue piece 171 is larger than the small diameter portion 172 constituting a portion other than the tongue piece 171. The length of the tongue piece 171 is set to be several times the width thereof, and the tongue piece 171 can easily bend in the direction of reducing the diameter. The three notches 1 formed at the base of the tongue piece 171
Reference numeral 82 is used as a tool insertion point when the attached one-way clutch is removed.

When the retainer 15 is made of a metal material, if the tongue piece 171 is on the same plane as the flange 17, the tongue piece 171 can be formed only by press working, which facilitates the working. When the retainer 15 is made of a synthetic resin, the entire retainer 15 including the flange 17 and the tongue piece 171 can be integrally injection-molded, but can be pressed in the same manner as in the case of a metal material. In this case, if the tongue piece 171 and the flange 17 are on the same plane, the tongue piece 17
1 can be easily formed.

A ring-shaped coil spring 16 is mounted on the cylindrical portion 18 of the retainer 15 in advance, and the sprag 13 is inserted into a holding hole 181 formed in the cylindrical portion 18 to form the sprag 13. When the coil spring 16 is fitted into the spring receiving groove 131, the sprag 13 is held in the holding hole 181 by the pressing force of the coil spring 16. As described above, the plurality of sprags 13 are mounted on the cage 15 and the one-way clutch 1
0 is configured. After the plurality of sprags 13 are mounted on the retainer 15, the inner ring 22 is positioned inside the retainer 15 and the outer ring 21 is positioned outside (see FIG. 1).

The outer ring 21 is provided with a flange 17 of the cage 15.
And a flange receiving groove 23 for fixing the retainer 15 is formed. The flange receiving groove 23 is coaxial with the outer ring 21 at a predetermined position on the inner wall of the outer ring 21 and is larger than the diameter of the small diameter portion 172 of the flange 17 and slightly smaller than the outer diameter of the tongue piece 171 formed on the flange 17. It is formed with a depth so as to have a small inner diameter.

When the clutch 10 is assembled between the outer ring 21 and the inner ring 22, the outer diameter of the tongue piece 171 is formed larger than the inner diameter of the outer ring 21. Elastic tongue piece 17
1 can easily bend in the direction of reducing the diameter, so that the retainer 15 can be easily moved to a desired position inside the outer ring 21. When the tongue piece 171 is moved to the position of the flange receiving groove 23 formed on the inner wall of the outer ring 21 in a state where the tongue piece 171 is bent,
The tongue piece 171 is fitted and fixed in the flange receiving groove 23 to return to the original shape. It is necessary that the strength of the fixed state does not come off in a normal use state, and is appropriately adjusted by adjusting the depth of the flange receiving groove 23 and the value of the outer diameter of the tongue piece 171 before deformation. can do.

The tongue piece 171 formed on the flange 17 is
If it fits into the flange receiving groove 23 of the outer race 21 and functions to fix the clutch 10 to the outer race 21, the number and shape to be formed are the same as those described as the first embodiment of the present invention. It is not limited.

As described above, the one-way clutch 1 of the present invention
0 can be attached to an outer ring of any shape as long as the outer ring has the flange receiving groove 23 formed thereon.
Further, since the retainer 15 can be inserted into the mounting opening from the cylindrical portion 18 side or the flange 17 side of the retainer 15, any operating direction of the one-way clutch can be obtained.

When the one-way clutch is mounted, the tongue piece 171 of the flange 17 is pressed against the flange receiving groove 23, so that a frictional force is generated between the outer peripheral end of the tongue piece 171 and the flange receiving groove 23. . This frictional force is the drag torque, and even when the one-way clutch is not wedge-engaged, the flange 17 is dragged and rotated by the outer ring 21, thereby preventing the occurrence of slip between the outer ring 21 and the sprag 13. The value of the drag torque can be adjusted by adjusting the outer diameter of the tongue piece 171 of the flange 17 and the depth of the flange receiving groove 23 on the inner wall of the outer ring 21.

[0023]

The one-way clutch of the present invention can be freely moved in the outer ring by utilizing the elastic deformation of the tongue of the flange when assembled between the outer ring and the inner ring. The mounting is possible regardless of the structure, and the mounting direction of the one-way clutch is not limited.
Also, no extra space is required and the number of parts can be reduced. On the processing side, there is an advantage that it can be manufactured only by pressing. And since the generation | occurrence | production location of the friction which contributes to generation | occurrence | production of a drag torque can be disperse | distributed in the circumferential direction, the wear by local friction can be reduced.

[Brief description of the drawings]

1 shows a state in which a one-way clutch according to a first embodiment of the present invention is mounted between an outer ring and an inner ring; FIG. 1 (a) is a front view, and FIG. 1 (b) is FIG. -B line longitudinal sectional view.

FIG. 2 shows a cage according to the first embodiment of the present invention, and FIG.
2A is a front view, and FIG. 2B is a vertical sectional view taken along line bb of FIG. 2A.

3A and 3B show a state in which a conventional one-way clutch is mounted between an outer ring and an inner ring. FIG. 3A is a front view, and FIG. 3B is a vertical sectional view taken along line bb of FIG. 3A. .

FIG. 4 is a front view of a retainer used in the one-way clutch shown in FIG. 3;

[Explanation of symbols]

 10: One-way clutch 13: Sprag 15: Cage 17: Flange 171: Tongue piece 18: Tubular portion 181: Sprag holding hole 21: Outer ring 22: Inner ring 23: Flange receiving groove

Claims (4)

[Claims] 1. A one-way clutch comprising a retainer for holding a sprag interposed between an outer race and an inner race, wherein the retainer comprises a cylindrical portion having a flange at one end and a retaining hole for the sprag. The flange has a plurality of elastically deformable tongues extending substantially in a circumferential direction, and the tongues are incorporated into flange receiving grooves formed in the outer ring by utilizing elastic deformation of the tongues, and are disposed in an axial direction. A one-way clutch, wherein the one-way clutch is fixed to the clutch. 2. An outer diameter of the tongue is formed slightly larger than a diameter of the flange receiving groove, and when the flange is incorporated in the flange receiving groove, drag torque is generated on the tongue by the outer ring. The one-way clutch of claim 1, wherein the one-way clutch is adapted to: 3. The one-way clutch according to claim 1, wherein said tongue is formed on the same plane as said flange. 4. The one-way clutch according to claim 1, wherein said retainer is made of metal or synthetic resin.