JPH09280276A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently reduce weight and decrease cost by a method wherein outer and inner cages are formed of plastic, and a metallic member is completely embedded in the column part and the annular parts on both sides of the inner cage. SOLUTION: Outer and inner cages 3 and 2 are formed of plastic. A metallic member 8 is completely embedded in the interior of the column part and the interior of the annular parts on both sides in the axial direction, interconnecting the column parts, of the inner cage 2 made of plastic. The metallic member 8 consists of a sheet in which a rectangular hole larger than a pocket 2a for holding a sprag 1 is blanked. The further stable inner cage 2 is provided in such a way that during moulding of the inner cage 2 by using plastic, the metallic member 8 is embedded in the columnar part and the annular parts on both sides for integral molding. Through constitution of the inner cage 2, a strength and alignment of the sprag 1 are maintained by rigidity of the metallic member 8, and an impact on the inner cage 2 of the sprag 1 during lock is relaxed by deformation of plastic with which the metallic member 8 is covered.

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, a transmission of an automobile.

[0002]

2. Description of the Related Art Conventionally, a one-way clutch has a plurality of sprags 31, an inner retainer 32 made of metal for holding an inner portion 31a of the sprag 31, and an outer portion 3 of the sprag 31.
It is provided with a metal outer retainer 33 for holding 1b and an annular spring 34 for urging the sprag 31. The one-way clutch is mounted between an inner wheel and an outer wheel (not shown).

[0003]

The above-described conventional one-way clutch has a problem that it is heavy and expensive because both the inner cage 32 and the outer cage 33 are made of metal.

Therefore, a high strength is required for the inner cage that holds the swing center portion of the sprag, but the outer cage, which has a smaller required strength than the inner cage, is formed of plastic,
A one-way clutch has been proposed to reduce the weight and cost (see Japanese Patent Laid-Open No. 63-3032). However, even in this one-way clutch, the inner cage is still made of metal, so that weight reduction and cost reduction are insufficient.

An object of the present invention is to provide a one-way clutch that solves the above problems and achieves a sufficient weight reduction and cost reduction.

[0006]

Means for Solving the Problems As means for solving the above problems, a plurality of sprags are provided between an inner ring and an outer ring with a predetermined interval in the circumferential direction, and the sprags are provided as an inner part. In a one-way clutch equipped with an inner cage and an outer cage that respectively retain outer sides and a spring that biases the sprag in one direction, the outer cage and the inner cage are made of plastic, and are made of the plastic. It is characterized in that the metal member is completely buried in the pillar portion and the annular portions on both sides of the inner cage.

Further, the metal member is made of a thin plate having a pocket for holding a sprag punched out, and the metal member is completely embedded and integrally molded when the inner cage is molded by plastic.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the one-way clutch includes a plurality of sprags 1, an inner cage 2, an outer cage 3, and an annular spring 4, and is mounted between an inner ring and an outer ring (not shown). To be done.

The inner retainer 2, the outer retainer 3 and the spring 4 have retaining pockets 2a, 3a and 4a for the sprag 1 which are provided at predetermined intervals in the circumferential direction. The inner cage 2 holds the inner portion 1a of the soup plug 1 fitted in the pocket 2a, and the outer cage 3
Is the outer portion 1b of the sprag 1 fitted in the pocket 3a.
Hold. Further, the spring 4 is the pocket 4 described above.
The sprag 1 fitted in a is urged in a direction in which it meshes with an inner ring and an outer ring (not shown).

The outer cage 3 has a flange portion 3b extending radially outward from one end in the axial direction. Further, the inner cage 2 has a flange portion 2b extending inward in the engagement direction from one end in the axial direction.

The outer cage 3 and the inner cage 2 are made of plastic. The metal member 8 is completely embedded inside the pillar portion 5 of the plastic inner cage 2 and inside the annular portions 6 and 7 on both axial sides to which the pillar portion 5 is connected. That is, the surface of the metal member 8 is completely covered with plastic.

The metal member 8 is formed of a thin plate having a rectangular hole 8a larger than the holding pocket 2a of the sprag 1 punched out. By embedding in the annular portions 6 and 7 and integrally molding, a more stable plastic inner retainer 2 in which a metal member is embedded can be obtained. In addition, if necessary, the metal member 8 may include a portion embedded in the pillar portion 5 and the annular portions 6 and 7 on both sides.
The embedded portion may be a separate member.

By configuring the inner cage 2 as described above,
While the strength is maintained, the alignment of the sprag 1 is maintained by the rigidity of the metal member 8, and the impact of the sprag 1 on the inner cage 2 when the one-way clutch is locked is caused by the deformation of the plastic covering the metal member 8. Will be alleviated.

[0014]

In the one-way clutch of the present invention, since the outer cage and the inner cage can be made of plastic, sufficient weight reduction and cost reduction can be achieved.

[Brief description of drawings]

FIG. 1A is a front view of a one-way clutch of the present invention, and B is A.
FIG.

FIG. 2 is a partially developed plan view of the inner cage of the one-way clutch of FIG.

FIG. 3A is a front view of a conventional one-way clutch, and B is a TT cross-sectional view of A.

[Explanation of symbols]

 1 Sprag 2 Inner retainer 3 Outer retainer 4 Spring 5 Column part 6,7 Annular part 8 Metal member

Claims (2)

[Claims] 1. A plurality of sprags arranged at a predetermined interval in the circumferential direction between an inner ring and an outer ring, and an inner cage and an outer cage which respectively hold the inner and outer sides of the sprag. In the one-way clutch provided with a spring for urging the sprag in one direction, the outer cage and the inner cage are made of plastic, and a metal member is provided on a column portion and both annular portions of the plastic inner cage. One-way clutch characterized by being completely buried. 2. A one-way method characterized in that the metal member is a thin plate in which a holding pocket for a sprag is punched, and the metal member is completely embedded and integrally molded during plastic molding of the inner cage. clutch.