JPH04228238A - Manufacture of outer ring in uniform coupling - Google Patents

Abstract

PURPOSE:To offer the method for manufacturing an outer ring in a uniform coupling with which the degree of freedom in layout in a car is increased by partitioning with an intermediate wall 26 while holding concentricity between track groove in inner periphery of a cup part 12 and a serration part 18 in the inner periphery of a shaft part 14 and also securing required length of the serration part 18. CONSTITUTION:Cutting work is applied to a hole in the shaft part 14 in a first pre-formed body 30 to obtain the serration part having the desired depth, and by forming the serration, the sufficient and effective length is secured. Further, at the time of forming the track groove by inserting a punch into the inner periphery of cup part 12, by forming the serration part under condition in close contact with the punch, the concentricity can be secured.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method of manufacturing a constant velocity joint outer ring, and more particularly, the present invention relates to a method for manufacturing a constant velocity joint outer ring, and more particularly, a track groove on the inner circumference of a cup portion and a serration portion on the inner circumference of a shaft portion are separated by an intermediate wall, and a sufficient amount of water is provided in the serration portion. The present invention relates to a method of manufacturing a constant velocity joint outer ring that makes it possible to secure an effective serration length and add flexibility to the layout of a vehicle.

0002

2. Description of the Related Art Conventionally, a constant velocity joint outer ring of this type has a cup body with one end open and a driven shaft integrally formed at the other end of the cup body. In recent years, a constant velocity joint outer ring has been used in which the driven shaft is formed separately from the cup body, and the driven shaft and the cup body are connected via serrations provided in the cup body.

[0003] In such a constant velocity joint outer ring, a manufacturing method is used in which the track groove and the serration portion are made to communicate with each other as a means for facilitating machining. However, in the constant velocity joint outer ring manufactured by the above method, it is necessary to press-fit a cap in order to prevent lubricating oil such as grease sealed on the serration side from flowing out, and as a result, there is an inconvenience that the number of parts increases. It's becoming obvious.

On the other hand, a method is also known in which an intermediate wall is formed between the track groove and the serration groove without using a cap in order to prevent lubricating oil such as grease from flowing out.

[0005]

[Problems to be Solved by the Invention] However, in the constant velocity joint outer ring in which the track groove and the serration groove are separated by an intermediate wall using the above method, a high It is quite difficult to obtain a molded body having concentricity with high processing accuracy. Further, due to the presence of the intermediate wall, it is difficult to ensure a sufficient effective serration length in the serration portion.

Accordingly, an object of the present invention is to provide an intermediate wall that partitions the track groove and the serration part, to ensure a sufficiently effective serration length in the serration part, and to ensure a sufficient effective serration length between the track groove and the serration part. It is an object of the present invention to provide a method for manufacturing a constant velocity joint outer ring that can form a constant velocity joint outer ring having concentricity.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a track groove located on the inner periphery of the cup portion and extending in the axial direction, and a serration located on the inner periphery of the shaft portion and extending in the axial direction. A method for manufacturing a constant velocity joint outer ring having a first prepared hole having a shape similar to the track groove in the cup portion, a second prepared hole for forming a serration portion in the shaft portion, a first step of molding a first preform in which the first prepared hole and the second prepared hole are partitioned by an intermediate wall;
a second step of molding a second preformed body in which the bottom of the second prepared hole of the first preformed body obtained in the step is cut to form a hole for forming a serration portion of a desired depth; A first punch for forming a track groove is inserted into the first prepared hole obtained in the first step, facing the intermediate wall, and the second punch is inserted into the first prepared hole obtained in the first step.
The present invention is characterized by comprising a third step of inserting a second punch into the serration portion forming hole obtained in the step and finishing forming the track groove and the serration portion, respectively.

[0008]

[Operation] In the present invention, after cutting the bottom of the second pilot hole of the first preform to obtain a second preform having holes for forming serrations of a desired depth, the serrations are formed. By doing so, the length from the cup bottom of the track groove to the effective portion of the serration portion located on the inner circumference of the shaft portion can be shortened, and a sufficient effective length of the serration portion can be ensured.

[0009] Furthermore, when finish forming the track holes and the serrations by inserting punches into the first prepared hole of the second preform and the hole for forming the serrations,
The serrations are formed with the preform in close contact with the punch inserted into the prepared hole, thereby ensuring concentricity between the track groove and the serrations.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the method of manufacturing a constant velocity joint outer ring according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, which is a sectional view taken along the line II--II in FIG. 1, reference numeral 10 indicates a constant velocity joint outer ring 10 manufactured by the method for manufacturing a constant velocity joint outer ring according to the present invention. The constant velocity joint outer ring 10 includes a cup portion 12 having an open end, and the cup portion 12.
It consists of a cylindrical shaft portion 14 located on the opposite side to the opening side of the shaft.

Three track grooves 16a to 16c are formed on the inner periphery of the cup portion 12, extending in the direction of the axis AA.

A serration portion 18 is provided on the inner circumference of the shaft portion 14.
is formed, and a driven-side shaft (not shown) is engaged with this serration portion 18 .

The track grooves 16a to 16c of the cup portion 12 and the serration portion 18 of the shaft portion 14 have the same central axis, and the track grooves 16a to 16c and the serration portion 18 are connected to each other with an intermediate wall 26 in between. It is separated by a partition wall and is in a non-communicating state.

The constant velocity joint outer ring 10 manufactured by the manufacturing method according to the present invention is basically constructed as described above.Next, the method for manufacturing the constant velocity joint outer ring 10 will be explained, its operation and Explain the effect.

FIG. 3 shows the shape of the molded product at each step in the method for manufacturing the joint outer ring 10.

Constant velocity joint outer ring 1 according to the first embodiment
In the manufacturing method of No. 0, in the first step, first, a cylindrical billet 28a shown in FIG. 3A is obtained as a raw material.

Then, the billet 28a is formed into a cup-shaped first shape as shown in FIG. 3D by a combination of extrusion forming, upsetting, etc. A preformed body 30 is formed. In the first preformed body 30, a first prepared hole 32 having a shape similar to the track grooves 16a to 16c is formed in the cup portion 12, and a serration portion 18 is formed in the shaft portion 14 in a third step to be described later. A second pilot hole 34 is formed for finishing molding. Further, the first prepared hole 32 and the second prepared hole 34 are partitioned by an intermediate wall 26.

In the second step, in order to give a sufficient effective serration length to the serration portion 18 obtained in the third step described later, the second prepared hole 3 of the first preform 30 is opened.
4, that is, the intermediate wall 26 on the second pilot hole 34 side,
A hole 19 for forming a serration portion is bored by cutting using C machining or the like. Through the second step, a second molded body having holes 19 for forming serrations as shown in FIG.
A preformed body 31 was obtained.

In the third step described later, the first prepared hole 32 of the second preform 31 is squeezed from the outer circumferential surface by a die, and at the same time is pressed by a punch closely attached to the inner circumferential surface to cause plastic deformation. The track grooves 16a to 16c are finished formed to follow the shape of the punch. Therefore, the size of the entire circumference of the first prepared hole 32 is determined from the track grooves 16a to 1.
Form it so that it is slightly larger than the finished dimension of 6c.

Further, the inner diameter of the serration forming hole 19 is formed to be smaller than the finished diameter of the serration portion 18 in order to form the serration portion 18 by pushing a punch into the serration forming hole 19.

In the third step, the second preformed body 31 formed in the second step is subjected to final molding. FIG. 4 shows an apparatus 40 used in the third step.

[0023] The device 40 has a first
, a die 44 that can freely move up and down the second preform 31 from its outer peripheral surface, and a second punch 46 for forming serrations.

The first punch 42 is fixed and oriented vertically, and its cross-sectional shape corresponds to the track grooves 16a to 16c.

The second punch 46 is disposed at a position facing the first punch 42 and is movable in the vertical direction. A serration processing part 48 is provided at the tip of the second punch 46, and when the serration processing part 48 is inserted into the serration part forming hole 19 of the second preform 31, the inner circumferential surface thereof is It is provided with a tooth portion for plastically deforming the serration portion 18 to finish forming the serration portion 18.

On the other hand, a spring 50 is interposed at the tail end of the second punch 46, and this spring 50
The punch 46 is urged downward in the figure, and
It is guided by the punch holder 52 and can be displaced a predetermined distance. The inner periphery of the die 44 has a tapered surface 54 for guiding and an ironing surface 56 having a smaller diameter than the outer diameter of the second preform 31.

The third step carried out using the apparatus 40 configured as described above will be explained.

First, as shown in FIG. 4A, the second preform 31 is mounted on the first punch 42 and positioned. At this time, the first punch 42 is loosely inserted into the first pilot hole 32 of the second preform 31, and the second preform 31 is thereby positioned.

Next, the die 44 descends and squeezes the second preform 31 from the outer peripheral surface to form the track grooves 16a to 16.
form c.

That is, as shown in FIG. 4b, the die 4
After the tapered surface 54 on the inner circumference of the die 44 contacts the second preform 31 and the die 44 descends while being guided along the tapered surface 54, the ironing surface 56 on the inner circumference of the die 44 contacts the second preform 31. It comes into contact with the outer peripheral surface of the body 31. Under this condition, die 44
When the second preform 31 is lowered, the second preform 31 is stretched, and its inner circumferential surface is pressed against the inner circumferential surface of the first punch 42, causing plastic deformation such that the flesh of the inner circumferential surface comes into close contact with the first punch 42. In the second preformed body 31, the track grooves 16a to 16c are finished with high precision on the inner circumferential surface thereof, and the constant velocity joint outer ring 10 shown in FIG. 1 is obtained.

[0031]Furthermore, it is also possible to perform the final forming of the track grooves 16a to 16c by a method different from the method described above.

That is, the length of the entire circumference of the first prepared hole 32 of the second preform 31 is set to be smaller than the finished dimension of the track grooves 16a to 16c, and a press-fitting allowance is provided between it and the first punch 42. Then, the die 44 is fixed to hold the second preformed body 31, and the first punch 42 is inserted into the second preformed body 31.
The track grooves 16a to 16c are finished formed by inserting it into the first prepared hole 32 and squeezing the inner periphery. At this time, in parallel with the final forming of the track grooves 16a to 16c, the second punch 46 is inserted into the serration forming holes 19 of the second preform 31 to form the serrations 18. At this time, the processing order of the track grooves 16a to 16c and the serrations 18 is as shown in FIG.
It is assumed that finish forming is started and is carried out with the second preform 31 in close contact with the first punch 42. As a result, the finish forming of the track grooves 16a to 16c and the serrations 18 can be performed as an integrated process as a whole, rather than as individual steps, and the serrations 18 can be finished formed using the first punch 42 as a reference. Therefore, the concentricity between the track grooves 16a to 16c separated by the intermediate wall 26 and the serration portion 18 is sufficiently ensured.

Furthermore, when comparing the constant velocity joint outer ring 10 obtained as described above with the constant velocity joint outer ring 100 manufactured by the conventional manufacturing method shown in FIG. The ten serrations 18 are clearly formed to be large. Therefore, the constant velocity joint outer ring 10 obtained by the manufacturing method according to this embodiment can ensure a more effective serration length.

Furthermore, since the intermediate wall 26 plays the role of a cap for preventing leakage of the enclosed lubricating oil, it is possible to reduce the number of parts for the cap.

[0035] In addition to the first embodiment described above, the following second embodiment
It is also possible to carry out an embodiment. That is, after the second step is completed, by forming the second preform 31 differently, the inner shape of the cup portion 12 in the constant velocity joint outer ring 10 is partially different, and the same as that of the constant velocity joint outer ring 10 is formed. It forms the outer ring of a constant velocity joint that is provided with the following functions. FIG. 5 shows a constant velocity joint outer ring 60 having a boss portion 62 manufactured by the method according to the second embodiment.

Boss portion 62 of the constant velocity joint outer ring 60
is formed using the apparatus 41 shown in FIGS. 5a to 5c. In FIG. 5, reference numeral 66 indicates the second preform 3
1, a knockout pin 68 is attached to this punch 66, and a space for forming a boss is provided between the knockout pin 68 and the second preform 31. 70 are defined. Reference numeral 72 is a punch inserted into the serration forming hole 19 of the second preform 31 , and reference numeral 74 is a holding member that restrains the second preform 31 with respect to the punch 66 . This pressing member 74 is urged by a coil spring 76 and guided by a guide rod 78.

Next, a method of forming the boss portion 62 of the constant velocity joint outer ring 60 will be explained. After completing the second step in the same manner as in the first embodiment, first, the punch 66 is
Fit into the prepared hole 32 and position. Next, punch 72
is inserted into the serration forming hole 19. The inserted punch 72 presses the intermediate wall 26, and as a result, plastic flow occurs that fills the space 70 with meat, and the boss portion 6
2 is formed. This boss portion 62 is used as a receiving stopper for a spherical end portion 62a of the drive shaft 64.

Second preformed body 3 with boss portion 62 formed
1, the knockout pin 68 is extended and taken out from the punch 66. The subsequent steps are the same as the finishing molding step corresponding to the third step of the first embodiment, and will therefore be omitted.

As described above, in the second embodiment, the holes 19 for forming the serrations are formed by cutting the intermediate wall 26.
A boss portion 62 is provided on the intermediate wall 26 of the second preform 31 having a
In the process of forming the serration part 18, the depth of the serration part forming hole part 19 is plastically deformed to become deeper, so that it becomes possible to obtain a sufficient serration effective length of the serration part 18.

[0040]

[Effect] As described above, according to the method of manufacturing a constant velocity joint outer ring according to the present invention, the concentricity of the constant velocity joint outer ring in which the track groove and the serration portion are partitioned by the intermediate wall can be ensured integrally. However, the serrations can be formed with high accuracy, and by cutting the intermediate wall of the hole that will become the serrations in advance, it is possible to easily obtain the necessary and sufficient effective serration length for the serrations.

Furthermore, when forming the boss portion on the intermediate wall, the depth of the hole that will become the serration portion is plastically deformed deeper, and therefore the effective length of the serration can be obtained more effectively and easily. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a constant velocity joint outer ring obtained by a first embodiment of the method for manufacturing a constant velocity joint outer ring according to the present invention.

[Fig. 2] II-II of the constant velocity joint outer ring in Fig. 1
FIG. 3 is a cross-sectional view taken along a line.

FIG. 3 is a schematic process diagram of a first embodiment of a method for manufacturing a constant velocity joint outer ring according to the present invention.

FIG. 4 is a vertical cross-sectional view showing a device used in the third step of the first embodiment of the method for manufacturing a constant velocity joint outer ring according to the present invention, and a schematic manufacturing process using the device.

FIG. 5 is a longitudinal sectional view of a constant velocity joint outer ring obtained by a second embodiment of the method for manufacturing a constant velocity joint outer ring according to the present invention.

FIG. 6 is a longitudinal sectional view showing an apparatus used in a second embodiment of the method for manufacturing a constant velocity joint outer ring according to the present invention and a schematic manufacturing process using the apparatus.

FIG. 7 is a longitudinal cross-sectional view of a constant velocity joint outer ring manufactured by a method according to the prior art.

[Explanation of symbols]

10... Constant velocity joint outer ring 12...Cup part 14...Shaft part 16a-16c...Track groove 18... Serration section 19...Hole for forming serrations 26...Intermediate wall 28a...Billet 30...First preformed body 31...Second preformed body 32...First prepared hole 34...Second prepared hole 44...Die 62...Boss part

Claims (3)

[Claims] 1. A method for manufacturing a constant velocity joint outer ring having a track groove located on the inner periphery of a cup portion and extending in the axial direction, and a serration portion located on the inner periphery of the shaft portion and extending in the axial direction, the method comprising: a first prepared hole having a similar shape to the track groove; a second prepared hole for forming a serration portion in the shaft;
a first step of molding a first preformed body in which the first pilot hole and the second pilot hole are partitioned by an intermediate wall; and a second lower part of the first preformed body obtained in the first step. The bottom of the hole is cut to form a hole with a desired depth for forming the serration part.
a second step of forming a preformed body, and inserting a first punch for forming a track groove into the first prepared hole obtained in the first step, facing the intermediate wall; A method for manufacturing a constant velocity joint outer ring, comprising: a third step of inserting a second punch into the serration portion forming hole obtained in the step, and finishing forming the track groove and the serration portion, respectively. 2. In the manufacturing method according to claim 1, after the track groove forming step progresses and the preform is brought into close contact with the track groove forming punch, the serration forming punch is inserted into the serration portion forming hole on the intermediate wall. A method for manufacturing a constant velocity joint outer ring, characterized in that a serration portion is formed by directional press-fitting. 3. The manufacturing method according to claim 1, wherein after the second step, a boss portion is formed in the intermediate wall so as to be oriented toward the hole for forming the serration portion. Production method.