JPH0824988B2 - Constant velocity joint outer ring manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a constant velocity joint outer ring. The present invention relates to a method for manufacturing a constant velocity joint outer ring capable of securing an effective length of serration and adding a degree of freedom to a vehicle layout.

[0002]

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

In such a constant velocity joint outer race, a method of manufacturing the track groove and the serration portion so as to communicate with each other is used as one means for facilitating the working.
However, in the constant velocity joint outer ring manufactured by the above method, it is necessary to press fit the cap in order to prevent the outflow of lubricating oil such as grease sealed in the serration portion side, and as a result, the number of parts increases. It is becoming apparent.

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

[0005]

However, in the constant velocity joint outer ring in which the track groove and the serration groove are separated by the intermediate wall by the method described above, it is high to avoid misalignment between the track groove and the serration portion. It is considerably difficult to obtain a molded product having concentricity with processing accuracy.
Also, it is difficult to secure a sufficient serration effective length in the serration portion due to the presence of the intermediate wall.

Therefore, an object of the present invention is to provide an intermediate wall for partitioning the track groove and the serration portion, to ensure a sufficiently effective serration effective length in the serration portion, and to connect the track groove and the serration portion. It is an object of the present invention to provide a method for manufacturing a constant velocity joint outer race capable of forming a constant velocity joint outer race having concentricity.

[0007]

In order to solve the above-mentioned problems, the present invention provides a track groove located on the inner circumference of the cup portion and extending in the axial direction, and a serration extending on the inner circumference of the shaft portion and extending in the axial direction. A method for manufacturing a constant velocity joint outer ring having a cup portion, the cup portion having a first prepared hole similar to the track groove, and the shaft portion having a second prepared hole for forming a serration portion, A first step of molding a first preformed body in which the first pilot hole and the second pilot hole are separated by an intermediate wall;
A second step of forming a second preform in which a bottom portion of the second prepared hole of the first preform obtained in the step is subjected to cutting to form a serration portion forming hole having a desired depth; The first punch for forming a track groove is inserted into the first prepared hole obtained in the first step so as to face the intermediate wall, and the second punch is formed.
A third step of inserting a second punch into the serration portion forming hole obtained in the step to finish-form the track groove and the serration portion, respectively.

[0008]

According to the present invention, the bottom portion of the second prepared hole of the first preform is cut to obtain a second preform having a serration portion forming hole of a desired depth, and then the serration portion is 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 periphery of the shaft portion can be shortened, and a sufficient effective length is secured in the serration portion.

Further, when the punch is inserted into the first prepared hole of the second preform and the serration portion forming hole to finish-form the track hole and the serration portion, respectively.
The serration portion is formed in a state in which the preform is in close contact with the punch inserted in the prepared hole, whereby the concentricity between the track groove and the serration portion is secured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for manufacturing a constant velocity joint outer race according to the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, which is a sectional view taken along 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
Is a cup portion 12 having one end opened and the cup portion 1
2 and a cylindrical shaft portion 14 located on the side opposite to the opening side.

On the inner circumference of the cup portion 12, there are formed three track grooves 16a to 16c extending in the direction of the axis AA.

A serrated portion 18 is provided on the inner circumference of the shaft portion 14.
Is formed, and a driven shaft (not shown) is meshed with the 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 line, and the track grooves 16a to 16c and the serration portion 18 have an intermediate wall 26 therebetween. It is in a non-communication state because it is partitioned.

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

FIG. 3 shows the shape of the molded product in 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 No. 0, in the first step, first, the cylindrical billet 28a shown in FIG.

Then, for example, the billet 28a is formed into a cup shape as shown in FIG. 3d through the shape of the forming process of 28b and 28c in FIG. 3 by a combination of extrusion forming, upsetting forming and the like. The preform 30 is formed.
In the first preform 30, the cup portion 12 is formed with a first prepared hole 32 having a similar shape to the track grooves 16a to 16c, and the shaft portion 14 is provided with the serration portion 18 in a third step described later. A second prepared hole 34 to be finish-formed is formed. The first prepared hole 32 and the second prepared hole 34 are separated by the intermediate wall 26.

In the second step, the second prepared hole 3 of the first preform 30 is provided in order to give a sufficient serration effective length to the serration portion 18 obtained in the later-described third step.
4 at the bottom, that is, the intermediate wall 26 on the second pilot hole 34 side is M /
The serration portion forming hole 19 is formed by cutting by C processing or the like. The second step, which is a molded product having the serration portion forming holes 19 shown in FIG.
Thus, a preformed body 31 of was obtained.

The first prepared hole 32 of the second preform 31
In a third step described later, the outer peripheral surface is squeezed by a die and at the same time pressed by a punch closely attached to the inner peripheral surface to cause plastic deformation, and the track grooves 16a to 16c are finish-molded according to the shape of the punch. To be done. Therefore, the size of the entire circumference of the first prepared hole 32 is formed to be slightly larger than the finished size of the track grooves 16a to 16c.

The inner diameter of the serration portion forming hole 19 is formed to be smaller than the finished diameter of the serration portion 18 in order to press the punch into the serration portion forming hole 19 to form the serration portion 18.

In the third step, finish molding of the second preform 31 formed in the second step is performed. The apparatus 40 used in the third step is shown in FIG.

The device 40 is a first device for forming a track groove.
No. 42, a die 44 capable of vertically moving the second preform 31 from the outer peripheral surface, and a second punch 46 for forming serrations.

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

The second punch 46 is arranged at a position facing the first punch 42 and is vertically displaceable. A serration processing portion 48 is provided at the tip portion of the second punch 46, and an inner peripheral surface of the serration processing portion 48 when the serration processing portion 48 is inserted into the serration portion forming hole portion 19 of the second preform 31. Is provided with a tooth portion for plastically deforming and finishing-forming the serration portion 18.

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

The third step carried out by using the apparatus 40 having the above structure will be described.

First, as shown in FIG. 4A, the second preform 31 is attached to the first punch 42 and positioned. At this time, the first punch 42 is loosely fitted into the first prepared hole 32 of the second preform 31, and the second preform 31 is thereby positioned.

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

That is, as shown in FIG.
The tapered surface 54 of the inner periphery of No. 4 comes into contact with the second preform 31, and the die 44 descends while being guided along the tapered surface 54. Then, the ironing surface 56 of the inner periphery of the die 44 is formed into the second preform. It contacts the outer peripheral surface of the body 31. Die 4 under this condition
When 4 is lowered, the second preform 31 is stretched, and the inner peripheral surface of the second preform 31 is pressed against the inner peripheral surface of the first punch 42, causing plastic deformation such that the meat on the inner peripheral surface adheres, After all, the track grooves 16a to 16c are finished on the inner peripheral surface of the second preform 31 with high accuracy, and the constant velocity joint outer ring 10 shown in FIG. 1 is obtained.

It is also possible to finish-form the track grooves 16a to 16c by a method different from the above method.

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 finishing dimension of the track grooves 16a to 16c, and a press-fitting margin is provided between the first punch 42 and the first punch 42. Then, the die 44 is fixed to hold the second preform 31, and the first punch 42 is attached to the second preform 31.
The track grooves 16a to 16c are finish-molded by inserting into the first prepared hole 32 and squeezing the inner circumference. At this time, in parallel with the finish forming of the track grooves 16a to 16c, the second punch 46 is inserted into the serration portion forming hole portion 19 of the second preformed body 31 to form the serration portion 18. At this time, the processing order of the track grooves 16a to 16c and the serration portion 18 is as shown in FIG.
It is assumed that the finish forming is started and the second preform 31 is brought into close contact with the first punch 42. As a result, the finish forming of the track grooves 16a to 16c and the serration portion 18 is not an individual step but an integral step as a whole, and the serration portion 18 is finish formed on the basis of the first punch 42. Therefore, the concentricity of the track grooves 16a to 16c separated by the intermediate wall 26 and the serration portion 18 is sufficiently ensured.

The constant velocity joint outer ring 10 obtained as above is compared with the constant velocity joint outer ring 100 manufactured by the manufacturing method according to the prior art shown in FIG. The ten serration portions 18 are obviously formed to be large. Therefore, the constant velocity joint outer ring 10 obtained by the manufacturing method according to the present embodiment can secure a more effective serration effective length.

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

In addition to the first embodiment, the following second
It is also possible to carry out the embodiment of. That is, after the completion of the second step, the inner shape of the cup portion 12 of the constant velocity joint outer ring 10 is partially different by forming the second preform 31 differently, and the same as the constant velocity joint outer ring 10. It forms a constant velocity joint outer ring with the function of. 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
Are formed using the device 41 shown in FIGS. In FIG. 5, reference numeral 66 is the second preform 3.
1 shows a punch to be inserted into the first prepared hole 32, and a knockout pin 68 is attached to the punch 66, and a space portion for forming a boss portion is provided between the knockout pin 68 and the second preform 31. 70 are defined. Reference numeral 72 is a punch that is inserted into the serration portion forming hole 19 of the second preformed body 31, and reference numeral 74 is a pressing member that restrains the second preformed body 31 with respect to the punch 66.
The pressing member 74 is biased by the coil spring 76 and guided by the guide rod 78.

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

Second preform 3 having boss portion 62 formed
In No. 1, the knockout pin 68 extends and is taken out from the punch 66. The subsequent steps are the same as those of the finish forming step corresponding to the third step of the above-described first embodiment, and therefore will be omitted.

As described above, in the second embodiment, the serration portion forming hole 19 in which the intermediate wall 26 is cut is formed.
The second preform 31 having a boss 62 on the intermediate wall 26.
Since the depth of the serration portion forming hole portion 19 is plastically deformed to be deeper in the process of forming, it is possible to obtain a sufficient serration effective length of the serration portion 18.

[0040]

As described above, according to the method for manufacturing a constant velocity joint outer race of the present invention, the constant velocity joint outer race in which the track groove and the serration portion are partitioned by the intermediate wall is integrally secured to be concentric. However, there is an effect that it can be formed with high accuracy, and that the necessary and sufficient serration effective length for the serration portion can be easily obtained by previously cutting the intermediate wall of the hole to be the serration portion.

Further, when the boss portion is formed on the intermediate wall, the depth of the hole serving as the serration portion is deeper and plastically deformed, so that the serration effective length can be obtained more effectively and easily. .

[Brief description of drawings]

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

FIG. 2 is a II-II of a constant velocity joint outer ring in FIG.
It is the sectional view which was fractured in the direction of a line.

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

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

FIG. 5 is a vertical cross-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 vertical cross-sectional view showing an apparatus used in a second embodiment of a method for manufacturing a constant velocity joint outer race according to the present invention and a schematic manufacturing process using the apparatus.

FIG. 7 is a longitudinal sectional view of a constant velocity joint outer ring manufactured by a method according to a conventional technique.

[Explanation of symbols]

 10 ... Constant velocity joint outer ring 12 ... Cup part 14 ... Shaft part 16a-16c ... Track groove 18 ... Serration part 19 ... Serration part formation hole 26 ... Intermediate wall 28a ... Billet 30 ... First preform 31 ... Second Preform 32 ... First prepared hole 34 ... Second prepared hole 44 ... Die 62 ... Boss part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-60839 (JP, A) JP-A-3-60840 (JP, A) JP-A-3-60841 (JP, A) JP-A-1- 62244 (JP, A) JP-A-3-60838 (JP, A)

Claims (3)

[Claims] 1. A method for manufacturing a constant velocity joint outer ring having a track groove located on the inner circumference of the cup portion and extending in the axial direction, and a serration part located on the inner circumference of the shaft portion and extending in the axial direction. Has a first pilot hole similar in shape to the track groove, and has a second pilot hole for forming the serration portion on the shaft portion,
A first step of forming a first preform in which the first prepared hole and the second prepared hole are separated by an intermediate wall, and a second bottom of the first prepared article obtained in the first step. The second with a serration portion forming hole having a desired depth drilled by cutting the bottom of the hole
And a second step of forming the preformed body of the second step, and inserting the first punch for forming the track groove into the first prepared hole obtained in the first step, facing the intermediate wall, and the second step. A third step of inserting a second punch into the hole for forming a serration portion obtained in the step to finish-form the track groove and the serration portion, respectively, and a third step for producing a constant velocity joint outer ring. 2. The manufacturing method according to claim 1, wherein 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 formed in the serration portion forming hole on the intermediate wall. A method for manufacturing a constant velocity joint outer ring, characterized in that the serration portion is pressed and formed by press-fitting in a directed manner. 3. The constant velocity joint outer ring according to claim 1, wherein after the second step is completed, the boss portion is formed so as to be directed to the serration portion forming hole with respect to the intermediate wall. Production method.