JPH069724B2 - Constant velocity joint outer ring and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention manufactures a constant velocity joint outer ring in which a space between the track groove on the inner periphery of the cup portion and the serration portion on the inner periphery of the shaft portion is partitioned by an intermediate wall, and the same. Regarding the method.

[Prior Art] Conventionally, the outer ring of this main constant velocity joint is generally one in which a driven shaft is integrally formed at the other end of a cup body having one end open. The outer ring of the constant velocity joint of the type that is connected through the serration portion provided in the above has been manufactured.

It is known that the outer race of such a constant velocity joit has a track groove and a serration portion communicating with each other for easy processing. With this type of constant velocity joint outer ring, it is necessary to press fit the cap so that the grease enclosed on the serration side does not flow out.
It has been pointed out that the number of parts is increased.

On the other hand, when the track groove and the serration portion are separated by an intermediate wall without using a cap, it is difficult to obtain a desired accuracy in order to establish concentricity between the track groove and the serration portion. At the same time, the number of man-hours increases because the processing of the track groove and the serration portion are completed in separate steps, so that a constant velocity joint outer ring of this type has not been actually manufactured.

[Problems to be Solved by the Invention] As described above, in order to manufacture a constant velocity joint outer ring in which the track groove and the serration portion are partitioned by the intermediate wall, the above-mentioned processing difficulties are involved, and in particular, the intermediate Due to the existence of the wall, it is not possible to secure a sufficient effective length in the serration part.

The present invention has been made in view of the above circumstances, and provides a constant velocity joint outer ring having a structure that includes an intermediate wall that divides a track groove and a serration portion and that can secure a sufficient effective length of the serration portion. And a method for manufacturing a constant velocity joint outer ring capable of forming both at the same time through forging without leaving an intermediate wall between the track groove and the serration portion without causing deviation in their concentricity. To do.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a constant velocity having a track groove extending axially in the inner circumference of the cup portion and a serration portion extending axially in the inner circumference of the cup portion. A method for manufacturing a joint outer ring by forging, comprising: a cup part having a first prepared hole similar to the track groove, and a shaft part having a second prepared hole for forming a serration part; A first step of forming a preformed body from the material in which a space between the prepared hole and the second prepared hole is partitioned; and a track groove formed in the first prepared hole so as to face and face the intermediate wall. A second step of inserting a molding punch and inserting a serration portion molding punch into the second pilot hole to finish-mold the track groove and the serration portion, respectively.

Further, according to the present invention, in an outer ring of a constant velocity joint having a track groove extending axially on the inner circumference of the cup portion and a serration portion extending axially on the inner circumference of the cup portion, the cup portion and the shaft portion are integrally formed. The track groove and the serration portion are separated from each other by an intermediate wall, and the intermediate wall forms a substantially enclosed lubricating oil leakage prevention member.

[Operation] A first prepared hole formed by separating the intermediate wall of the preform,
When the punches are respectively inserted into the second pilot holes to finish-mold the track groove and the serration portion, the serration portions are formed in a state in which the preform is in close contact with the punches inserted into the first pilot hole. Concentricity of the groove and the serration portion is secured.

[Embodiment] Next, an embodiment of a constant velocity joint outer ring and a method of manufacturing the same according to the present invention will be described with reference to the accompanying drawings.
The details will be described below.

FIG. 1 is a vertical sectional view of an outer ring 10 of a constant velocity joint,
FIG. 2 is a sectional view taken along line II-II in FIG. The outer ring 10 includes a cup portion 12 having an opening at one end and the cup portion 12.
It is composed of a cylindrical shaft portion 14 on the side opposite to the opening side of 12 and the cup portion 12 and the shaft portion 14 are integrally formed by forging. On the inner circumference of the cup portion 12, three track grooves 6a to 16c are formed extending in the axial direction thereof. On the other hand, a serration portion 18 is formed on the inner circumference of the shaft portion 14, and a shaft on the driven side meshes with the serration portion 18. Track groove 16a of the cup portion 12
Through 16c and the serration portion 18 of the shaft portion 14 have the same central axis. Such track grooves 16a to 16c
The serration portion 18 and the serration portion 18 are separated from each other by the intermediate wall 26. Therefore, the track grooves 16a to 16c and the serration portion 18 are separated.
Not in communication with 18.

Next, FIG. 3 shows the shape of a molded product corresponding to each step for carrying out the method for manufacturing the outer ring 10 as described above.

First, in the first forging step, the billet 28 having a cylindrical shape is used as a raw material (see FIG. 3a), for example, by a combination of extrusion and upsetting through the molding process of FIGS. 3b and 3c. Is a preform 30 formed into a cup shape (see FIG. 3d).

A first prepared hole 32 having a shape similar to the track grooves 16a to 16c is formed in the cup portion 12 of the preformed body 30.
The shaft portion 14 is formed with a second pilot hole 34 having a shape in which the serration portion 18 has not been molded yet.
The prepared hole 34 is partitioned by the intermediate wall 26. Where the first
Regarding the prepared hole 32, when the track grooves 16a to 16c are finished from the outer peripheral surface of the preformed body 30 by following the shape of a squeeze punch, the total circumferential length thereof is slightly larger than the finished size of the track grooves 16a to 16c. To be formed. Further, the second prepared hole 34 is formed so that the inner diameter thereof is smaller than the finished diameter of the serration portion 18 in order to press the punch to form the serration portion 18.

The preformed body 30 thus obtained has track grooves 16a to 16a.
It is subjected to a second forging step of finish-forming c and the serration portion 18. The manufacturing equipment used in the second official
Shown in the figure.

The manufacturing apparatus 40 includes a first punch 42 for forming track grooves.
And a die 44 that can be raised and lowered freely from the outer peripheral surface of the preform 30.
And a second punch 46 for serration processing. The first punch 42 is fixed so as to be oriented 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 displaceable in the vertical direction. A serrated portion 48 is provided at the tip of the second punch 46, and when the serrated portion 48 is pressed into the second prepared hole 34 of the preform 30, the inner peripheral surface thereof is plastically deformed, and the serrated portion 18 is formed. Is provided with a tooth portion that forms

On the other hand, a spring 50 is provided at the tail end portion of the second punch 46, and the spring 50 urges the second punch 46 downward in the figure and is guided by the punch holder 52 to be displaced by a predetermined distance. It is possible. The die 44 has a tapered surface 54 for guiding and an ironing surface 56 having a diameter smaller than the outer diameter of the preform 30.

Details of the second step performed using the manufacturing apparatus 40 configured as above will be described.

First, as shown in FIG. 4A, the preform 30 is positioned so as to cover the first punch 42. The first punch 42 is inserted in the first prepared hole 32 of the preformed body 30 in a loosely fitted state, whereby the preformed body 30 is positioned.

Next, the die 44 descends to squeeze the outer peripheral surface of the preform 30 to form the track grooves 16a to 16c.

That is, as shown in FIG. 4b, the taper surface 54 on the inner periphery of the die 44 abuts the preform 30, and the die 44 has the taper surface 54.
After descending while being guided along 54, the ironing surface 56 on the inner periphery of the die 44 contacts the outer peripheral surface of the preform 30. When the die 44 descends in this state, the preform 30 is stretched and its inner peripheral surface is pressed against the inner peripheral surface of the first punch 42 and plastically deformed so that the meat on the inner peripheral surface adheres. As a result, the preform 30 has a track groove 16 on its inner peripheral surface.
A to 16c are molded into the outer ring 10 which is finished with high precision (Fig. 4c).

Unlike the above case, the track groove 16
You may finish a to 16c. That is, the preform 30
The entire circumference of the first prepared hole 32 is smaller than the finished size of the track grooves 16a to 16c, and a press-fitting margin is provided between the first prepared hole 32 and the first punch 42. In that case, the die 44 is fixed and the preform 30 is restrained (the positional relationship between the die 44 and the first punch 42 in FIG. 4 is upside down), and the first punch 42 is preformed.
It is inserted into the first prepared hole 32 of 30 and the track grooves 16a to 16c are finished by such an inner peripheral ironing.

In parallel with the finish forming of the track grooves 16a to 16c as described above, the second punch 46 is inserted into the second prepared hole 34 of the preformed body 30 to form the serration portion 18. In this case, regarding the processing sequence of the track grooves 16a to 16c and the serration portion 18, as shown in FIG. 4c, at least the die 44 starts the finish forming of the track grooves 16a to 16c, and the preform 30 is formed. It is performed in a state of being in close contact with the first punch 42. As a result, the processing of the track grooves 16a to 16c and the serration portion 18 is not a separate step, but a step having integrity as a whole, and the processing of the serration portion 18 can be performed with the first punch 42 as a reference. Therefore, the concentricity of the track grooves 16a to 16c and the serration portion 18 separated by the intermediate wall 26 is improved. In the outer ring 10 obtained as described above, the intermediate wall 26 serves as a cap for preventing leakage of the enclosed lubricating oil, and the number of parts is reduced accordingly.

Next, another embodiment of the outer ring of the constant velocity joint will be described below.

FIG. 5 shows an outer ring of a constant velocity joint according to another embodiment. In this outer ring 60, a boss portion 62 is formed in the center portion of the intermediate wall 26 so as to be directed toward the track groove side, and the boss portion 62 has a spherical concave portion 62a for receiving the drive shaft 64.

FIG. 6 is a process diagram for manufacturing the outer ring 60 as described above, and in this case, unlike the process in the first embodiment, after the preform 30 is formed (FIG. 6d), this preform is prepared. It is added from the step of molding the boss portion 62 on the molded body 30 (Fig. 6e).

The formation of such a boss portion 62 is performed by using an apparatus as shown in FIG. In the figure, reference numeral 66 is a preform.
The punch inserted into the first pilot hole 32 of 30 is shown below.
A knockout pin 68 is attached to 66, and a space 70 for forming a boss is defined between the knockout pin 68 and the intermediate wall 26 of the preform 30. Reference numeral 72 is the preform 30
A punch inserted into the second prepared hole 34 of the reference numeral 74,
A pressing member 74 restrains the preform 30 against the punch 66. The pressing members 74, 74 are coil springs 76, 76.
And is guided by the guide rods 78, 78.

Therefore, after the punch 66 is positioned so as to be fitted into the first prepared hole 32 of the preform 30, the punch 72 is inserted into the second prepared hole 34. The inserted punch 72 presses the intermediate wall 26, as a result, plastic flow such that the space 70 is filled with meat occurs,
The boss portion 62 is formed. The boss portion 62 is used as a receiving stopper for the spherical end portion of the drive shaft (not shown).

The preform 30 having the boss 62 is a knockout pin.
68 is extended and taken out from the punch 66, and is provided to the next step, that is, the step of finishing the track groove and the serration portion. This step is the same as that of the first embodiment.

In the second embodiment, the boss 62 is formed on the intermediate wall of the preform 30 because the second pilot hole 34, in which the serration 18 is finished later, becomes deeper in the process of forming the boss 62. The effective length of the serration part is secured.

[Effects of the Invention] As described above, according to the present invention, the constant velocity joint outer ring in which the track groove and the serration portion are partitioned by the intermediate wall is integrally molded with good accuracy while ensuring concentricity. In addition, since it can be formed only by the forging process, it has good mass productivity, and in the end, it has the effect of contributing to the improvement of productivity.

Further, in the constant velocity joint outer ring thus formed, it is possible to easily form the boss portion on the intermediate wall, and at the time of forming the boss portion, the prepared hole is deep so that the effective length of the serration portion can be secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an outer ring of a constant velocity joint, FIG. 2 is a sectional view of the outer ring of FIG. 1 taken along the line II-II, and FIG. 3 is a method of manufacturing an outer ring of a constant velocity joint of the present invention. FIG. 4 is a process diagram according to one embodiment, FIG. 4 is an explanatory diagram of a process of finishing the track groove and the serration portion in the manufacturing method, and FIG. 5 is a longitudinal sectional view of an outer ring of a constant velocity joint according to another embodiment. FIG. 6 is a process diagram relating to the manufacturing of the outer ring of the constant velocity joint in FIG. 5, and FIG. 7 is an explanatory diagram of the process of forming the boss portion on the intermediate wall in the outer ring of the constant velocity joint of the second embodiment. is there. 10 ... Outer ring 12 ... Cup part 14 ... Shaft part 16a to 16c ... Track groove 18 ... Serration part 26 ... Intermediate wall 28 ... Billet 30 ... Preform 32 ... First prepared hole 34 ... Second prepared hole 40 ... Manufacturing device 42 … 1st punch 44… Die 46… 2nd punch 62… Boss part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Asaka 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Inventor Haruo Meguro 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Hondaae Engineering Co., Ltd.

Claims (5)

[Claims] 1. A method for manufacturing a constant velocity joint outer ring having a track groove extending axially in the inner circumference of the cup portion and a serration portion extending axially in the inner circumference of the cup portion by a forging process. It has a first pilot hole similar in shape to the track groove, a second pilot hole for molding the serration portion on the shaft, and a partition wall between the first pilot hole and the second pilot hole. A first step of forming a preformed body from a raw material, inserting a track groove forming punch into the first prepared hole so as to face the intermediate wall and face the intermediate wall, and serrate the second prepared hole. A second step of inserting a portion forming punch to finish-form the track groove and the serration portion, respectively, and a method for producing a constant velocity joint outer ring. 2. The manufacturing method according to claim 1, wherein after the track groove is formed and the preform is brought into close contact with the track groove forming punch, the serration forming punch is directed to the intermediate wall in the second prepared hole. A method for manufacturing a constant velocity joint outer ring, comprising press-fitting and then press-molding the serration portion. 3. The manufacturing method according to claim 1, wherein after forming the preform, a boss is formed by pressing the intermediate wall from the second prepared hole side with a punch to direct it toward the second prepared hole side. A method for manufacturing a constant velocity joint outer ring, comprising: 4. An outer ring of a constant velocity joint having a track groove extending axially in the inner circumference of the cup portion and a serration portion extending axially in the inner circumference of the shaft portion, wherein the cup portion and the shaft portion are integrally formed. An outer ring of a constant velocity joint, characterized in that the track groove and the serration portion are partitioned by an intermediate wall, and the intermediate wall forms a substantially sealed lubricating oil leakage prevention member. 5. The outer ring according to claim 5, wherein the intermediate wall forms a boss portion projecting toward the track groove side and having a spherical concave portion at the center, and the boss portion serves as a spherical bearing stopper for the drive shaft. The outer ring of a constant velocity joint characterized by: