JPH07317797A - Outer ring of constant velocity joint - Google Patents

Abstract

PURPOSE:To enable certain connection of joint boots to an outer ring to be press-molded. CONSTITUTION:A cylindrical surface 7 is formed on an opening end of ah outer ring 1 by pressing, while a band groove 8 is formed on the cylindrical surface 7. With this method, the cylindrical surface 7 is formed with high accuracy, so that an opening 12 of boots 11 can be installed with close contact. Axial escaping is prevented by fitting a band 13 to a band groove 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer ring of a constant velocity joint formed by press working, and more particularly to a structure for connecting the outer ring to a joint boot.

[0002]

2. Description of the Related Art In order to reduce the weight of a constant velocity joint and reduce the manufacturing cost, a shell type outer ring molded by press working has been receiving attention.

As a conventional technique for forming such a shell type outer ring, there is one proposed in Japanese Patent Laid-Open No. 5-185147.

In this proposal, a cylindrical material is pressed twice to form a track portion extending in the axial direction on the outer peripheral surface of the outer ring, and the entire outer peripheral surface of the molded outer ring is formed. A plurality of petal-shaped track grooves are projected.

By the way, when the joint boot is to be joined to the open end of the molded outer ring, the shape of the joint of the boot is changed to a special petal shape to match the outer shape of the outer ring. There is a problem that it is necessary to form boots. Further, the work of fitting the boot and the outer ring having a petal-like complicated shape takes time, and there is a problem that workability is poor.

On the other hand, in Japanese Unexamined Patent Publication No. 6-10957, a collar-shaped flange that is left in a state where it is not deep-drawn and not deformed is provided at the opening end of the seal-type outer ring.
A constant velocity joint using the flange for the fitting portion of the boot is considered.

However, since the above-mentioned flange is not subjected to deep drawing, variations in diameter are likely to occur, and even if the boot is fitted, it does not come into close contact with the flange, and a reliable connection is difficult to obtain. There's a problem.

The flange left without deep drawing is
Since the shape of the boot extends straight in the axial direction, if the end of the boot is fitted to the flange and the band is tightened and fixed from the outside of the boot, the band easily slips out toward the boot side and is strong. There is a drawback that you cannot connect different boots.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to provide a structure of an outer ring capable of surely connecting an open end of a shell type outer ring and a boot by a simple process.

[0010]

In order to solve the above problems, the present invention relates to an outer ring formed by press molding a plurality of track grooves axially extending on a cylindrical peripheral surface, and an outer peripheral surface of an opening end portion of the outer ring. To form a cylindrical surface by pressing,
The cylindrical surface was used as the fitting portion of the joint boot.

A second means of the present invention is that the cylindrical surface of the above structure is provided with a band groove into which the fixing band of the joint boot is fitted in the radial direction.

[0012]

As described above, by forming a cylindrical surface by pressing at the open end of the outer ring, a cylindrical surface with high dimensional accuracy can be formed, and the boot can be firmly attached to the cylindrical surface. Can be installed.

Further, when the band groove is provided on the cylindrical surface as in the second means, the band is prevented from coming off in the axial direction,
It is possible to maintain a reliable connected state of the boots.

[0014]

1 to 3 show an embodiment according to the present invention. The outer ring 1 is a pipe material A made of thin steel plate.
Is formed by pressing, and the shaft 2 is coupled to the bent end wall 1a of the outer ring 1.

A plurality of axially extending track grooves 3 are press-molded in the central portion of the peripheral surface of the outer ring 1, and balls 5 of a torque transmitting member 4 including a cage, an inner ring and the like are fitted into the respective track grooves 3. By inserting it, a constant velocity joint is formed.

At the end of the outer ring 1 on the opening side, a cylindrical portion 6 extending parallel to the axis of the outer ring is formed by press working.

Further, a band groove 8 continuous in the circumferential direction is formed on the cylindrical surface 7 forming the outer peripheral surface of the cylindrical portion 6, and a step portion 9 projecting in the radial direction is formed on both sides of the band groove 8. 10 are formed.

The cylindrical portion 6 and the band groove 8 are formed at the same time as the press work for forming the outer shape of the outer ring 1 and the track groove 3, or by another press work after the press work is completed.

Outer ring 1 of constant velocity joint having the above structure
After assembling the torque transmission member 4 inside as shown in FIG. 3, fit the opening 12 of the joint boot 11 into the cylindrical surface 7 of the outer ring 1 and tighten the band 13 from the outside of the fitting portion of the boot 11. And fix the boot 11. In this case, the band 13 is mounted so as to be fitted in the band groove 8 of the outer ring 1 in the radial direction.

When the boot is mounted as described above, the cylindrical surface 7 of the outer ring 1 is finished by press working with high dimensional accuracy, so that the opening 12 of the boot 11 is securely attached to the cylindrical surface 7 for mounting. It is possible to perform stable mounting.

Further, since the band 13 is fitted in the band groove 8 and the withdrawal of the band is reliably stopped by the step portions 9 and 10 on both sides, the boot 11 is maintained in the mounted state for a long period of time.

[0022]

As described above, according to the present invention, since a cylindrical surface having a high dimensional accuracy is formed by press working at the opening end of the outer ring, the boot can be mounted in a state in which the boot can be surely brought into close contact, and the stable outer ring can be obtained. And boots can be connected.

Further, like the second means, by providing the band groove on the cylindrical surface, it is possible to prevent the band from slipping out, and it is possible to maintain a firm fixed state of the boot.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an outer ring of a constant velocity joint according to an embodiment.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical cross-sectional front view showing a state in which boots are attached to the outer ring of the same.

[Explanation of symbols]

 1 Outer ring 2 Shaft 3 Track groove 4 Torque transmission member 5 Ball 6 Cylindrical part 7 Cylindrical surface 8 Band groove 9, 10 Step part 11 Boots 12 Opening part 13 Band A Pipe material

Claims (2)

[Claims] 1. An outer ring of a constant velocity joint in which a plurality of track grooves extending in the axial direction are press-formed on a cylindrical peripheral surface,
An outer ring for a constant velocity joint, characterized in that a cylindrical surface is formed on the outer peripheral surface of the open end of the outer ring by press working, and the cylindrical surface is used as a fitting portion of a joint boot. 2. The outer ring of a constant velocity joint according to claim 1, wherein the cylindrical surface is provided with a band groove into which a fixing band of the joint boot is fitted in a radial direction.