JPH06173977A - Holder for one-way clutch - Google Patents

Abstract

PURPOSE:To provide the holder of a one-way clutch having high rigidity at a low cost. CONSTITUTION:A belt plate formed by cold rolling or drawing and having projections at the center section in the width direction is molded into a circular shape, and butted ends 4 are welded to form a circular body 1. Pockets 3 are formed at a uniform interval in the peripheral direction of the circular body 1, and pillar sections 5 having drag lugs 6 are formed between adjacent pockets 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage for holding a sprag of a one-way clutch.

[0002]

2. Description of the Related Art Two cages having different diameters are incorporated between a cylindrical inner surface of an outer ring and a cylindrical outer surface of an inner ring, and a plurality of pockets are formed at equal intervals in the circumferential direction of each cage so as to face each other in the radial direction. A one-way clutch in which the sprag is installed in the pocket and the spring provided between the pair of cages holds the sprag so that the cam surfaces on the inner and outer diameter sides of the sprag engage the cylindrical inner surface and the cylindrical outer surface. Is conventionally known (Japanese Utility Model Publication No. 1-40345).

There are two types of cages for one-way clutches, one formed by shaving and the other formed by press molding. FIG. 7 shows a state in which the outer cage 13a is formed by press molding in the order of steps. A circular blank 30 shown in FIG. 7B is drawn to form a bottomed container 32 having a flange 31 as shown in FIG. 7B. 7 (c), the step of removing the bottom of the container 32 to finish the inner and outer diameters of the annular portion 33 to a predetermined size, and punching the annular portion 33 as shown in FIG. (D) The step of forming the pockets 14 as shown in FIG.

[0004]

By the way, in forming the cage by press molding, there is a disadvantage that much material is wasted and the cost is high.

Generally, in a one-way clutch,
In order to surely transmit the movement of the drive wheel to the sprags, such as rapid acceleration / deceleration or high speed rotation, a frictional force applying means is provided between the retainer and the drive wheel to transmit the movement of the drive wheel to the retainer.

Therefore, in a retainer formed by press molding as shown in FIG. 7, a drag clip is attached to the retainer to make frictional contact with the drive wheel, or as shown in FIG. Pocket 1 from one side
4 to form two notches 16 to form a T-shaped piece 17, and the T-shaped piece 17 is bent outward to elastically contact the raceway surface of the drive wheel to keep the rotation of the drive wheel. Thirteen
It is transmitted to a so that the sprag can be tilted in the circumferential direction.

However, in the frictional force applying means using the drag clip, it is necessary to use a plurality of drag clips, which causes a problem in cost. On the other hand, in the frictional force applying means for forming the T-shaped piece 17, the retainer 13a is used. There is a problem that the rigidity of the

An object of the present invention is to solve the above-mentioned conventional problems, reduce the waste of material when manufacturing a cage, and reduce the cost by eliminating the need for attaching a drag clip, and The technical issue is to increase the rigidity of the cage.

[0009]

In order to solve the above-mentioned problems, according to the present invention, there is provided a cage which is incorporated between a cylindrical inner surface of an outer ring and a cylindrical outer surface of an inner ring and which holds a sprag for transmitting torque. It has an abutting end in a part of the circumferential direction, and the abutting end is formed from a welded annular body, and pockets for holding sprags are formed at equal intervals in the circumferential direction of the annular body. The surface shapes of the pair of annular portions are symmetric, and a drag protrusion that frictionally engages with the cylindrical inner surface of the outer ring or the cylindrical outer surface of the inner ring is formed in the pillar portion between the adjacent pockets.

[0010]

When forming the cage having the above structure,
Formed by cold rolling or drawing, a metal strip of a predetermined length having a protrusion in the center in the width direction is formed into a circular shape, and its abutting ends are welded to form an annular body. Before molding or after forming the annular body, the pocket is punched to obtain a product.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an outer cage incorporated between an outer ring and an inner ring of a one-way clutch.

The outer cage comprises an annulus 1. The annular body 1 has a pair of annular portions 2 and 2 whose surface shapes are symmetrical at both ends in the axial direction, and a plurality of pockets 3 are provided at equal intervals in the circumferential direction between the annular portions 2 and 2.

The annular body 1 has a butt end 4 at a part in the circumferential direction, and the butt end 4 is welded. Here, the position of the abutting end 4 may be a position corresponding to the pocket 3 as shown in FIG. 1, or may be a position crossing the pillar portion 5 between the adjacent pockets 3 in the axial direction. .

A drag projection 6 is provided on the outer surface of the pillar 5. The drag projection 6 frictionally engages with the cylindrical inner surface 10a of the outer ring 10 when the outer cage is assembled between the outer ring 10 and the inner ring 11 of the clutch shown in FIG.

When manufacturing the outer cage having the above structure, as shown in FIG. 2 (a), a strip 20 having a projecting portion 21 at the center in the width direction is formed by cold rolling or drawing. The strip 20 is cut into a predetermined length, and the strip 20 is subjected to pocket removal at the stage of the raw material, then formed into a circular shape, and the butt ends are welded. Alternatively, the strip plate 20 is formed into a circular shape, the butt ends are welded, and then the pocket removal is performed as in the conventional case.

FIG. 3 (a) shows the cage when the pockets are removed from the strip 20. In this case, pocket 3
The pair of side surfaces 7 opposed to each other in the circumferential direction of the cage incline toward the center of the cage, and when the sprag 12 is inserted into the pocket 3, the sprag 12 and the side surface 7 may interfere with each other. In order to avoid the interference, as shown in FIG. 4, the inner diameter portion of the side surface 7 is pressed against the surface to provide a tapered surface 7a.

In the cage in which the pocket is removed after welding, as shown in FIG. 3B, since the side surfaces 7 of the pocket 3 which face each other in the circumferential direction of the cage are parallel to each other, surface pressing work is unnecessary. be able to.

In the production of the cage as described above, if the surface shape of the strip plate 20 on both sides in the width direction is asymmetric, it is formed into a circular shape so that the abutting ends coincide with each other due to the difference in bending rigidity of both sides. Things are extremely difficult. However, in the manufacturing of the outer cage according to the present invention, as shown in FIG. 2 (a), since the strip 20 whose surface shape is symmetrical on both sides can be used, the strip 20 is extremely accurate. It can be well formed into a circular shape, and it is possible to manufacture a weld cage.

FIGS. 2 (b) to 2 (d) show various strips 20 capable of manufacturing a weld retainer. In the strip 20 shown in FIG. 2 (b), the strips 20 are provided on both sides of the surface having the protrusion 21. A pair of ridges 2
2, 22 are provided. In the strip 20 shown by (C), a pair of protrusions 23, 23 are provided on both sides of the back surface of the surface having the protrusion 21. Further, the strip plate 20 indicated by (d)
In the above, the protrusions 24 are provided on the surface having the protruding portion 21 and on both sides of the rear surface of the surface.

When various strips 20 as described above are used,
It is possible to form a retainer having a flange on the annular portion 2.

FIG. 4 shows a state in which the outer cage A and the inner cage B according to the present invention are assembled between the outer ring 10 and the inner ring 11, and the drag protrusions 6 of the outer cage A are formed on the outer ring 10. It is frictionally engaged with the inner cylindrical surface 10a. In the assembled state, when the outer ring 10 is rotated in the direction of the arrow in the figure, the outer retainer A also rotates together with the outer ring 10 due to the frictional force of the contact portion between the drag projection 6 and the cylindrical inner surface 10a, and the sprag 12 moves in the engaging direction. The inner and outer cam surfaces 12a, 12b are inclined and the inner ring 1
No. 1 cylindrical outer surface 11a and the outer ring 10 cylindrical inner surface 11
The rotation of the outer ring 10 is transmitted to the inner ring 11 via the sprag 12 by engaging with b.

On the other hand, when the outer ring 10 rotates in the direction opposite to the arrow, the outer cage A also rotates, and the sprag 12 tilts in the opposite direction to the cam surfaces 12a and 12b so that the cam surfaces 12a and 12b are cylindrical.
a and the cylindrical outer surface 11a are disengaged. Therefore, the rotation of the outer ring 10 is not transmitted to the inner ring 11.

The one-way clutch shown in FIG. 4 has an outer ring 1
Since the clutch has 0 as the driving wheel, the outer cage A is provided with the drag projections 6 and the inner cage B is shown with the flanges 8 at both ends of the inner diameter surface.
When using as a driving wheel, the inner cage B is provided with a drag projection. The inner cage B is also formed by the same method as the outer cage A.

The number of drag protrusions 6 formed on the column portion 5 of the outer cage A is arbitrary, and in FIG. 6, the column portion 5 is provided with two drag protrusions 6a and 6b.

When the outer cage A is assembled in a certain direction, a groove 9 for identifying the assembling direction is formed in the pillar portion 5 as shown in FIG. 5, or as shown in FIG. The width dimensions of the two drag protrusions 6a and 6b are made different.

[0027]

As described above, in the retainer of the one-way clutch according to the present invention, the forming method in which the strip plate formed by cold rolling or drawing is formed into a circular shape and the butt ends are welded is adopted. Therefore, the waste of the material is less than that of the cage formed by press molding, and the cost of the cage can be reduced.

Further, since the pillar is provided with the drag projection which frictionally engages with the drive wheel, the rotation of the drive wheel can be surely transmitted to the retainer, and the same effect as when the drag clip is attached is obtained. In addition, since the pair of annular portions and the pillar portion do not have a separating portion, a cage having high rigidity can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a cage according to the present invention.

2 (a), (b), (c), and (d) are cross-sectional views showing various strips used for manufacturing a weld cage.

FIG. 3A is a sectional view showing a part of the cage when the pocket is formed in the state of the strip, and FIG. 3B is a sectional view showing a part of the cage when the pocket is formed after welding.

FIG. 4 is a sectional view of a one-way clutch using the cage shown in FIG.

FIG. 5 is a perspective view showing another example of the same cage.

FIG. 6 is a perspective view showing still another example of the same cage.

7 (a), (b), (c), and (d) are cross-sectional views showing step by step the molding process of a press-formed cage.

FIG. 8 is a perspective view showing a conventional cage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Annular body 2 Annular part 3 Pocket 4 Butt end 5 Column part 6 Drag protrusion 10 Outer ring 10a Cylindrical inner surface 11 Inner ring 11a Cylindrical outer surface

Claims (1)

[Claims] 1. A retainer for a one-way clutch, which is incorporated between a cylindrical inner surface of an outer ring and a cylindrical outer surface of an inner ring and holds a torque transmission sprag in a predetermined state, and has a butting end at a part in a circumferential direction. However, the abutting ends are made of welded annular bodies, pockets for holding sprags are formed at equal intervals in the circumferential direction of the annular body, and the surface shapes of the pair of annular portions at both axial ends of the annular body are symmetrical. A retainer for a one-way clutch is characterized in that a columnar portion between adjacent pockets is provided with a drag protrusion that frictionally engages with a cylindrical inner surface of the outer ring or a cylindrical outer surface of the inner ring.