JPH10137882A - Manufacture of constant velocity joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing process and the manufacturing cost of a constant velocity joint having a flange on an end part of an outward joint member of the constant velocity joint. SOLUTION: A disk-shaped stock is divided in the outer circumferential direction, an outward joint member 21 is formed from one divided member 41, and a flange part 23 is formed from the other divided member 42. The time-consuming machining such as cutting can be dispensed with, and a constant velocity joint having the flange 23 can be simply manufactured from one stock. Thus, the manufacturing cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a constant velocity joint having a flange at an end of an outer joint member of the constant velocity joint.

[0002]

2. Description of the Related Art Conventionally, as a constant velocity joint having a flange at an end of an outer joint member of the constant velocity joint, there is one disclosed in Japanese Patent Application Laid-Open No. 7-317776. As shown in FIG. 5, a hub 2 having a flange 3 for connecting wheels is integrally attached to an end of an outer joint member 1 of a constant velocity joint 10 and a vehicle body is provided outside the outer joint member 1. The inner ring 11 of the bearing 7 that supports the knuckle 6 connected to the knuckle 6 is integrally formed.

Since the outer joint member 1 of such a constant velocity joint has a cylindrical shape, a cylindrical member is generally manufactured by press working such as deep drawing.

[0004]

However, the technique of manufacturing the outer joint member of the constant velocity joint by pressing the cylindrical member described above can reduce the manufacturing cost to some extent, but is not suitable for actual use. Has a constant velocity joint 1
In order to prevent the grease used for lubrication of 0 from scattering and foreign substances from being mixed into the constant velocity joint portion 10, it is necessary to separately attach the end cover 5, and the number of parts increases,
There was a problem that cost increased.

[0005] Also, there is a conventional constant velocity joint having a flange in which an end cover is integrated as shown in Japanese Patent Publication No. 4-72088. Although the manufacturing method is not specified in this known technique, it is considered that the manufacturing method is performed by hot forging and many cutting processes in consideration of the fact that the wall pressure of the cross-sectional shape varies in each part. In such a manufacturing method involving many cutting processes, there is a problem that manufacturing cost and time are increased.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to reduce a manufacturing process and a manufacturing cost of a constant velocity joint having a flange at an end of an outer joint member of the constant velocity joint. Aim.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a first aspect of the present invention is a constant velocity joint having a flange at an end of an outer joint member of the constant velocity joint. In a manufacturing method, the material is divided into three parts of a first outer peripheral part, a second outer peripheral part, and a central part by cutting an outer peripheral part of the disk-shaped raw material while leaving a central part. A molding die for an outer joint member for molding the outer joint member is disposed on the side of the first outer peripheral portion of the portion, and the material is rotated. The outer joint member is formed from the first outer peripheral portion by relatively moving the pressing member and the material while pressing against the member forming die, and the second outer peripheral portion is used as the flange portion. is there.

According to a second aspect of the present invention, in the method of manufacturing a constant velocity joint according to the first aspect, the second outer peripheral portion includes a flange forming die for forming the flange on the second outer peripheral portion side of the center portion. The material is rotated by disposing the material, and the pressing member and the material are relatively moved while pressing the second outer peripheral portion against the flange forming die, thereby forming the material.

A third aspect of the present invention relates to a method of manufacturing a constant velocity joint having a flange portion at an end of an outer joint member of the constant velocity joint portion. By cutting the material into three portions, a first outer peripheral portion, a second outer peripheral portion, and a central portion, and a molding die for an outer joint member for molding the outer joint member on both sides of the central portion. And a flange forming die for forming the flange are disposed, and the material is rotated, and the first outer peripheral portion and the second outer peripheral portion are respectively pressed by a pressing member to form the outer joint member forming die and the flange. The outer joint member is formed from the first outer peripheral portion, and the flange portion is formed from the second outer peripheral portion by relatively moving the pressing member and the material while pressing against the forming mold. is there.

A fourth aspect of the present invention is any one of the first to third aspects.
Item, in the method of manufacturing a constant velocity joint, the constant velocity joint is a constant velocity joint in which a knuckle is supported via an outer periphery of the outer joint member via a bearing, and the pressing member is the first outer peripheral portion or the When forming the second outer peripheral portion, the inner ring portion of the bearing is formed at the same time.

According to a first aspect of the present invention, there is provided a manufacturing method according to the first aspect, wherein a disk-shaped material is cut into an outer peripheral portion while leaving a central portion, and the material is divided into three portions, a first outer peripheral portion, a second outer peripheral portion, and a central portion. Divided into Thereafter, a forming die for the outer joint member for forming the outer joint member is disposed on the first outer peripheral side of the center portion, and the material is rotated. Then, the outer joint member is formed by pressing the first outer peripheral portion against the mold for the outer joint member by the pressing member and relatively moving the first outer peripheral portion. The second outer peripheral portion is a flange portion. In this case, either of the processing of the first outer peripheral portion and the processing of the second outer peripheral portion may be performed first.

According to a second aspect of the present invention, the flange portion is formed by pressing the second outer peripheral portion against the flange forming die by a pressing member in the same manner as in the first aspect. Claim 3 provides a mold for outer joint member and a mold for flange on both sides of the center portion, rotates the material, and forms the material with the pressing member, thereby simultaneously forming the outer joint member with the outer joint member. A flange part is formed.

According to a fourth aspect, when the pressing member forms the first outer peripheral portion or the second outer peripheral portion, the inner ring portion of the bearing for supporting the knuckle is simultaneously formed.

[0014]

Embodiments of the present invention will be described below. FIG. 1 shows a constant velocity joint manufactured by the manufacturing method of the present embodiment. The main body 30 of the present constant velocity joint mainly includes an outer joint member 21 of the constant velocity joint 20 and a hub 22 having a flange 23. Outside the outer joint member 21, an inner ring 31 of a bearing 27 that supports a knuckle 26 connected to the vehicle body is integrally formed.

First, the constant velocity joint 20 will be described. An outer joint member 21 serving as an outer frame portion of the constant velocity joint portion 20 is a cup-shaped member having one end opened, and has a plurality of first guide grooves 12 extending in an axial direction on an inner peripheral surface thereof. . Inside the outer joint member 21, the first
The same number of second guide grooves 13 as the number of guide grooves 12 extending in the axial direction are formed, and an inner joint member 14 having a drive shaft 17 is disposed coaxially with the outer joint member 21. Also, the first
Between the guide groove 12 and the second guide groove 13, balls 15 are arranged so as to be rollable. Further, a cage 16 for holding the ball 15 is interposed between the inner surface of the outer joint member 21 and the inner joint member 14.

A hub 22 is integrally formed at an end of the outer joint member 21, and a flange 23 is formed at an end of the hub 22. The flange 23 is provided with a bolt hole 23a into which a bolt 23b for mounting a wheel is inserted. The hub 22 and the outer joint member 21
An end cover portion 25 for preventing scattering of grease used for lubricating the constant velocity joint portion 20 and entry of foreign matter into the constant velocity joint portion 20 is formed integrally with the inner surface of the constant velocity joint portion 20. .

The knuckle 26 is a cylindrical member, and is supported on the outer periphery of the outer joint member 21 via a bearing 27. At the end of the knuckle 26, a bolt hole 26 for inserting a bolt for connecting this constant velocity joint to the vehicle body is provided.
a is provided. The bearing 27 includes a plurality of balls 27a. These balls 27a are arranged between an inner ring 31 formed integrally on the outer periphery of the outer joint member 21 and an outer ring 32 formed on the inner surface of the knuckle 26. It is supposed to roll.

Next, a method of manufacturing the main body 30 of the constant velocity joint will be described with reference to FIGS. Body 3
0 is manufactured from an iron disk 40 as a material shown in FIG. That is, the disk 40 is cut in the vertical direction, and a cut is made halfway. By this process, the disc 40 is divided into the first outer peripheral portion 41 and the second
The outer peripheral portion 42 and the first and second outer peripheral portions 41 and 42 are connected to form a central portion 43 which is a central portion (FIG. 2).
(C)). In these three portions, the first outer peripheral portion 41
Is the outer joint member 21, and the second outer peripheral portion 42 is the hub 22 having the flange 23. The central portion 43 becomes the end cover portion 25 (FIG. 3F).

In the plastic working of the disk 40, a working method called spinning or flow forming is used. Next, the processing method will be described in detail.
As shown in FIG. 2A, the iron disk 40 has a center hole 40a at the center. Then, the disk 40 is attached to a known spinning machine. That is,
The disc 40 is sandwiched between the outer joint member forming die 51 and the flange forming die 52 around the center hole 40a (FIG. 2B). The outer joint member forming mold 51 is a mold for forming the outer joint member 21. The shape of the inner peripheral surface of the outer joint member 21 such as the first guide groove 12 can be formed by spinning. I have. Similarly, the mold 52 for flanges
Is a mold for molding the hub 22 including the flange 23.

The disk 40 sandwiched between the two molds 51 and 52 is rotated around a rotation axis orthogonal to the disk 40 through the center hole 40a. Then, the cutter 53 is made to approach the center of rotation from the side of the disk 40, and the disk 40 is vertically divided while leaving the center portion (FIG. 2C). The cutter 53 is a rotary cutter having an inclined cutting surface.
As a result, the disk 40 becomes three portions, that is, a first outer peripheral portion 41, a second outer peripheral portion 42, and a central portion 43.

When the cutting of the disk 40 is completed, the cutter 5
3 is retracted, and then the roller 54 is moved closer between the first outer peripheral portion 41 and the second outer peripheral portion 42 (FIG. 3D). The roller 54 is for pressing the first outer peripheral portion 41 and the second outer peripheral portion 42 against the respective molds 51 and 52 to perform spinning molding, and the first and second outer peripheral portions 41 and 42 are pressed with a predetermined pressing force.
And rotates with the rotation of the disc 40,
It moves along the rotation axis direction.

Accordingly, by moving the roller 54 along the direction of the rotation axis, the first outer peripheral portion 41 is pressed against the outer joint member forming die 51 to form the inner surface thereof. Similarly, the second outer peripheral portion 42 is pressed against the flange forming die 52 to form the hub 22 including the flange 23 (FIG. 3E). As a result, the central portion 43 becomes the end cover portion 25. After that, the pressing force of the roller 54 and the type of the roller 54 are changed to change the bearing 27.
The inner ring 31 is pressed and molded.

When the spinning is completed as described above, the machined body 30 is removed from the spinning machine, and the inner ring 31 of the bearing 27, the first guide groove 12 in the outer joint member 21 and the like are formed in a separate step. Perform grinding. Further, a bolt 23a of the flange 23 is formed. Processing of the main body 30 is completed by such a process (FIG. 3).
(F)). And the main body 3 thus manufactured
0, the structure inside the constant velocity joint portion 20, the inner joint member 1
4, while assembling the ball 15, the cage 16, etc.
The knuckle 26 is assembled via the bearing 27, and the manufacture of the constant velocity joint of the present embodiment is completed.

In the processing steps described above, the rotation of the disk 40, the rotation and reciprocation of the cutter 53, the reciprocation of the roller 54 and the movement in the direction of the rotation axis are all performed by actuators provided in the spinning machine. . In the present embodiment, the first outer peripheral portion 41 and the second
Although the outer peripheral portion 42 and the outer peripheral portion 42 are formed at the same time, they need not always be formed at the same time, and may be separately processed. When processing is performed separately, the first outer peripheral portion 41 and the second outer peripheral portion 4 are used.
Any of the two may be processed first.

Since the constant velocity joint according to the first embodiment described above has the knuckle 26 for connecting the constant velocity joint to the vehicle body, the inner ring 31 of the bearing 7 supporting the knuckle 26 is removed. It is integrally formed outside the joint member 21. The present invention is not limited to such a method of manufacturing a constant velocity joint, and may be a constant velocity joint having no knuckle 26 as in the second embodiment shown in FIG.

In the second embodiment, the outer joint member 81
Is integrally formed with a flange 83 at the end of the flange. Reference numeral 85 denotes a portion formed from the central portion 43 of the disk 40, and serves as an end cover portion. Further, in the case of such a constant velocity joint having a relatively simple shape, it is not always necessary to perform plastic working such as spinning on the flange 83 side, and in such a case, only the outer joint member 81 is subjected to plastic working.

[0027]

As described above, according to the present invention, a disk-shaped material is used, the outer circumferential direction is divided, an outer joint member is formed from one of the divided members, and the outer joint member is formed from the other divided member. The flange part is formed. Therefore,
A constant velocity joint having a flange can be easily manufactured from one material, and the manufacturing cost can be reduced.

Further, since the material is divided leaving a central portion, this central portion acts as an end cover.
It is not necessary to assemble the end cover later, so that the number of parts can be reduced and the manufacturing process can be simplified. According to the fourth aspect, since the inner ring portion of the bearing for supporting the knuckle is formed at the same time, the manufacturing process can be further simplified and the manufacturing time can be further reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a constant velocity joint according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a manufacturing process according to the first embodiment.

FIG. 3 is a view showing a continuation of FIG. 2;

FIG. 4 is a view showing a constant velocity joint according to a second embodiment.

FIG. 5 is a view showing a conventional constant velocity joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Constant-velocity joint part 21 Outer joint member 22 Hub 23 Flange 25 End cover part 26 Knuckle 27 Bearing 31 Inner ring 40 Disk 41 First outer peripheral part 42 Second outer peripheral part 43 Center part 51 Mold 51 for outer joint member 52 Flange Molding tool 53 Cutter 54 Roller

Claims (4)

[Claims] 1. A method of manufacturing a constant velocity joint having a flange at an end of an outer joint member of a constant velocity joint, wherein an outer peripheral portion is cut into a disk-shaped material while leaving a central portion. For the outer joint member for dividing the material into three parts, a first outer peripheral part, a second outer peripheral part, and a central part, and forming the outer joint member on the first outer peripheral part side of the central part. By disposing a forming die and rotating the raw material, while pressing the first outer peripheral portion against the outer joint member forming die by a pressing member, the pressing member and the raw material are relatively moved, whereby the second A method for manufacturing a constant velocity joint, wherein the outer joint member is formed from one outer peripheral portion, and the second outer peripheral portion is used as the flange portion. 2. The second outer peripheral portion is connected to the second peripheral portion of the central portion.
A flange forming die for forming the flange is provided on the outer peripheral portion side, the material is rotated, and the pressing member and the material are pressed while pressing the second outer peripheral portion against the flange forming die by a pressing member. 2. The method for manufacturing a constant velocity joint according to claim 1, wherein the molding is performed by relatively moving the joint. 3. A method of manufacturing a constant velocity joint having a flange at an end of an outer joint member of the constant velocity joint, wherein an outer peripheral portion is cut into a disc-shaped material while leaving a central portion. The material is divided into three parts, a first outer peripheral part, a second outer peripheral part, and a central part, and a molding die for an outer joint member for molding the outer joint member on both sides of the central part, and the flange. A mold for forming a flange is formed, the material is rotated, and the first outer peripheral portion and the second outer peripheral portion are pressed by a pressing member to form the outer joint member forming mold and the flange forming mold, respectively. The outer joint member is formed from the first outer peripheral portion, and the flange portion is formed from the second outer peripheral portion by relatively moving the pressing member and the material while pressing the outer peripheral member. Constant velocity jo Method of manufacturing cement. 4. The constant velocity joint is a constant velocity joint in which a knuckle is supported on the outer periphery of the outer joint member via a bearing, and the pressing member is formed of the first outer peripheral portion or the second outer peripheral portion. The method for manufacturing a constant velocity joint according to any one of claims 1 to 3, wherein the inner ring portion of the bearing is formed simultaneously when the forming is performed.