JPH11226662A - Manufacture of constant velocity joint parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost by manufacturing plural numbers of constant velocity joint parts at one time working. SOLUTION: In a base stock forming process, a connected base stock 111, wherein plural parts having nearly a uniform wall thickness are integrally connected in the longitudinal direction, is formed from a pipe stock by bulging. In the connected base stock 111, a bulged part 112 in the radial direction is formed in the middle part in the longitudinal direction and parts 111a of a thin diameter are formed in the both end parts. In a dividing process, the connected base stock is cut on the way in the longitudinal direction to divide it into plural parts. This method is applicable to manufacture an outer ring and a cage of a constant velocity joint.

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 component such as an outer ring or a cage of a constant velocity joint used for a drive transmission shaft such as a drive shaft or a propeller shaft of an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 13, for example, as shown in FIG. 13, a drive shaft 19 and a slide type constant velocity joint A provided at both ends thereof and a fixed type constant velocity It is constituted by a joint B. Shaft part 1 of slide type constant velocity joint A spline-coupled to differential side gear
The outer ring 11 fixed to the outer ring 5 has three overhangs 12 arranged at equal intervals and extending in the axial direction, and three engagement grooves 12 a formed in the inner surface thereof. The three rollers 18 rotatably supported by three trunnions 17a extending in the radial direction from the tripod 17 spline-coupled to each other are respectively engaged in the engagement grooves 12a, whereby the rotation of the differential side gear rotates the drive shaft. 19 is transmitted. The outer ring 21 fixed to the shaft 25 of the fixed type constant velocity joint B spline-connected to the steering drive wheel is formed with six overhangs 22 arranged at equal intervals and extending in an arcuate shape in the axial direction. At the same time, six engagement grooves 22a are formed on the inner surface thereof, and the six engagement grooves 26a formed on the outer surface of the inner ring 26 and the engagement groove 22a of the outer ring 21 are formed on the outer surface of the inner ring 26 splined to the other end of the drive shaft 19. In between, the six balls 27 held by the cage 28 are respectively engaged, whereby the rotation of the drive shaft 19 is transmitted to the steered drive wheels.

[0003]

The outer race of such a constant velocity joint is formed by cold or hot forging or press forming from a drawn pipe material (for example, Japanese Patent Application Laid-Open No. 60-1758).
No. 26). In the case of forging, the number of processing steps required to obtain an outer ring from a rod-shaped material increases, and in addition, multiple outer rings cannot be manufactured by one processing, so that a large amount of offcuts is generated and the material yield deteriorates. Also, the processing lead time per part becomes longer, so that the manufacturing cost increases. In the case of press molding, the number of processing steps is reduced, but when multiple outer rings of constant velocity joints are connected in the axial direction, a bulge of a complicated shape that protrudes radially from both ends occurs in the middle part Since the core mold cannot be removed, press molding cannot be performed. For this reason, a plurality of outer rings cannot be manufactured by one processing, so that the processing lead time is prolonged, and the yield of the material is deteriorated, so that the manufacturing cost is increased.

Cages of constant velocity joints are also formed by cold or hot forging or press forming from drawn pipe material (for example, Japanese Patent Application Laid-Open No. 57-165145). In the case of manufacturing a cage that bulges out, it is necessary to press with a separate mold from both ends in the axial direction, so that it is not possible to manufacture a plurality of outer rings by a single processing. Therefore, as in the case of the outer ring, the processing lead time is lengthened, and the yield of the material is deteriorated, so that the manufacturing cost is increased. An object of the present invention is to solve such a problem and reduce the manufacturing cost of constant velocity joint parts.

[0005]

SUMMARY OF THE INVENTION A method of manufacturing a constant velocity joint part according to the present invention comprises connecting a plurality of parts having a substantially uniform thickness integrally in the longitudinal direction and radially expanding in the longitudinal direction. Forming a connecting material in which a portion is formed and a narrow diameter portion is formed in at least one place from a pipe material by bulging, and a dividing process of cutting the connecting material in the longitudinal direction and dividing it into a plurality of pieces Consisting of

In order to apply the method for manufacturing a constant velocity joint component according to the present invention to the outer race of a constant velocity joint, the connecting material is formed by forming a plurality of bulging portions which are arranged at equal intervals in the circumferential direction and extend in the longitudinal direction. Formed at the middle part or both ends and the cylindrical small diameter part is formed at both ends or the middle part,
In the dividing step, it is preferable that the connecting material is cut at a bulging portion or a small-diameter portion formed at an intermediate portion in the longitudinal direction so as to be divided into a plurality.

In order to apply the method of manufacturing a constant velocity joint part according to the present invention to a cage of a constant velocity joint, a connecting material is provided with a plurality of bulging portions arranged at predetermined intervals in an axial direction and extending in a circumferential direction. Is formed in the middle part in the longitudinal direction and the cylindrical small diameter portions are formed at both ends, and in the dividing step, the connecting material is cut between each bulging portion and between each bulging portion and each small diameter portion. It is preferable to divide into a plurality.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIGS. 1 to 5, the present invention relates to an outer ring 1 of a slide type constant velocity joint A (see FIG. 13).
The first embodiment applied to the manufacture of No. 1 will be described. In this embodiment, first, in a material forming step, a connecting material 111 in which two outer rings 11 are continuously connected in the axial direction on the opening end side so as to be integrated with each other is formed from a pipe material 110 by bulging. In a subsequent dividing step, the connecting material 111 is divided at the center in the longitudinal direction, and two outer rings 11 are manufactured.

A bulge mold 30 used in the material forming step of the first embodiment is, as shown in FIGS.
The lower mold 31 and the upper mold 32 are detachably joined to each other, and the outer mold 11 has the same shape between the joined two molds 31 and 32 as described above. Cavity 33 is formed. This cavity 33
The longitudinal direction of the outer ring 11 is parallel to the joining surface of the two dies 31, 32, and the pipe member 110 serving as the material of the outer ring 11 is provided at both ends in the longitudinal direction.
A cylindrical portion 34 having the same diameter as the outside diameter is formed, and three projecting portions 35 which are arranged at intervals of 120 degrees in the circumferential direction and extend in the longitudinal direction are formed in an intermediate portion excluding both end portions. Each overhang portion 35 has the same outer shape as each overhang portion 12 of the outer race 11, and a boundary portion 36 between the overhang portions 35 is formed by extending a part of the cylindrical portion 34 in the circumferential direction in the axial direction. A cavity 33 is provided on the joint surface between the two dies 31 and 32.
Pressure guiding holes 37 communicating with both ends of the inside are formed, and air release holes 38 communicating with the outside are formed in each overhang 35.

In the raw material forming step of the first embodiment, a pipe material 110 obtained by cutting a drawn steel pipe into a predetermined length in a state in which the upper die 32 is lifted away from the lower die 31 is raised.
And the upper mold 32 is lowered, and the molds 31 and 32 are clamped together as shown in FIGS. 1 and 2. In this state, the entire periphery of both ends of the pipe member 110 is in contact with the cylindrical portion 34, and the intermediate portion is held in contact with the boundary portion 36 at three locations in the circumferential direction along the entire length in the longitudinal direction. Next, high-pressure water is introduced into the inside of the pipe member 110 from the left and right pressure guiding holes 37 to inflate the pipe member 110 as shown by a two-dot chain line 110a, and to contact the inner surfaces of the overhang portions 35 of the dies 31 and 32. Perform bulging. Some water leaked into the overhang 35 from between the cylindrical portion 34 of the two molds 31 and 32 and the outer peripheral surface of the pipe member 110 and the overhang 35
The air inside is discharged to the outside through the air escape hole 38.

As a result, as shown in FIG. 3, a connecting material 111 is formed by integrally connecting two outer rings 11 having substantially uniform thicknesses so as to be continuous in the axial direction on the opening end side. . At both ends of the thus formed connecting material 111, small-diameter portions 111 a serving as cylindrical portions 11 a, and three bulging portions 112 serving as overhanging portions 12 protruding radially at intermediate portions in the longitudinal direction. Formed to extend in the longitudinal direction,
A groove 11 serving as an engagement groove 12a is provided inside each bulging portion 112.
2a is formed. Raise the upper mold 32 to connect the material 11
1 is taken out and cut and divided along the cut surface X (see FIG. 3) at the center in the longitudinal direction of the connecting material 111 in the subsequent dividing step, two outer rings 11 are obtained. Then, the end surface of the small diameter portion 111a of the outer ring 11 is finished to form a cylindrical portion 11a, and the shaft portion 15 is fixed to the cylindrical portion 11a by welding or the like.
An inclined surface 13 for increasing the bending angle of the constant velocity joint and a boot groove 14 for mounting a boot are formed on the open end side of the outer ring 11. If necessary, the accuracy of the engagement groove 12a is improved by ioning (ironing).

According to the first embodiment, 1
Since two outer rings 11 can be obtained by one material forming process and dividing process, the amount of cut off material during subsequent processing is reduced, thereby improving the material yield, and the processing lead time per part. , The manufacturing cost is reduced.

The outer race 21 of the fixed type constant velocity joint B can be manufactured in the same manner as in the first embodiment, and the effect of improving the yield and shortening the processing lead time reduces the manufacturing cost. .

In the material forming step of the first embodiment, the connecting material 111 is formed in a state where the two outer rings 11 are integrally connected on the opening end side as shown in FIG. In the material forming step, the second
As in the embodiment, the connecting material 111A may be integrally formed so that two outer rings 11 having substantially uniform thicknesses are connected in the axial direction on the small-diameter portion 111a side. In the connection material 111A of the second embodiment, a small-diameter portion 111a serving as a cylindrical portion 11a is provided at an intermediate portion in the longitudinal direction, and three bulging portions 112 serving as overhang portions 12 are provided at both ends in a radial direction. Grooves 112a that protrude and extend in the longitudinal direction are formed inside the bulging portions 112 and serve as engagement grooves 12a. Take out the connection material 111A from the bulge type,
In the subsequent dividing step, if the cutting is performed along the cutting plane X1 (see FIG. 6) at the center in the longitudinal direction of the connecting material 111A, 2
Outer rings 11 are obtained. As in the case of the first embodiment, the shaft portion 15 is fixed to the cylindrical portion 11a of the outer race 11 by welding or the like, and the inclined surface 13 and the boot groove 1 are provided on the opening end side.
4 and, if necessary, the accuracy of the engagement groove 12a is improved by ioning or the like.

In the second embodiment, as in the case of the first embodiment, two outer rings 11 are obtained by one material forming step and one dividing step, so that the material yield is improved. Since the processing lead time per part is also shortened, the manufacturing cost is reduced.

Also, as in the third embodiment shown in FIG. 7, the connecting material 111B is the connecting material 1 of the first embodiment.
11 may be integrally molded in a state where two are connected in the longitudinal direction. In the third embodiment, the connection material 111B taken out of the bulge mold is subjected to a cutting step X2 at the center in the longitudinal direction and a cutting plane X3 at the center of each bulging portion 112 in the subsequent dividing step.
(See FIG. 7), four outer rings 1
1 is obtained. Then, as in the above embodiments, the outer race 1
The shaft portion 15 is fixed to the cylindrical portion 11a, the inclined surface 13 and the boot groove 14 are machined on the opening end side, and the accuracy of the engaging groove 12a is improved by eyeing if necessary.

In the third embodiment, since four outer rings 11 are obtained by one material forming step and one dividing step, the yield of materials is improved, and the processing lead time per part is further shortened. Therefore, the manufacturing cost is further reduced.

Next, a fourth embodiment in which the present invention is applied to the manufacture of the cage 28 of the fixed type constant velocity joint B (see FIG. 13) will be described with reference to FIGS. In this embodiment, first, three cages 28 are formed in a material forming process.
Are connected by a bulging process from the pipe material 280, and are connected in a subsequent dividing step.
1 is divided in the longitudinal direction to produce three cages 28.

As shown in FIGS. 8 and 9, a bulge mold 40 used in the material forming step of the fourth embodiment is composed of a lower mold 41 and an upper mold 42 which are separably joined to each other. A cavity 43 having the same shape as the outer shape of the three cages 28 integrally connected as described above is formed between the two dies 41 and 42 thus formed. The longitudinal direction of the cavity 43 is parallel to the joining surface of the two dies 41 and 42, and a cylindrical portion 44 having the same diameter as the outer diameter of the pipe material 280 as a material of the cage 28 is formed at both longitudinal ends. In the middle portion excluding the portion, three overhang portions 45 which are arranged at equal intervals in the axial direction and extend in the circumferential direction are formed. Each overhang 45 is a part of the same spherical surface as the outer shape of each cage 28, and the diameter of the boundary 46 between the overhangs 45 is the same as the diameter of the cylindrical portion 44. A pressure guiding hole 47 communicating with both ends in the cavity 33 is provided in a joint surface between the two dies 31 and 32.
Are formed, and each projecting portion 35 is formed with an air escape hole 48 communicating with the outside.

In the material forming step of the fourth embodiment, a pipe member 280 obtained by cutting a drawn steel pipe into a predetermined length is placed on the cylindrical portion 44 and the boundary portion 46 of the lower die 41, and the upper die 42 is formed.
Is lowered, and the molds are clamped in a state where the two molds 41 and 42 are joined as shown in FIGS. 8 and 9. In this state, the pipe material 28
At 0, the entire periphery of both ends and a part of the intermediate portion is held in contact with the cylindrical portion 44 and the boundary portion 46. Next, high-pressure water is introduced from the left and right pressure guiding holes 47 into the inside of the pipe member 280,
As shown by a two-dot chain line 280a, the pipe material 280 is inflated and bulge processing is performed so that the pipe material 280 comes into contact with the inner surfaces of the overhang portions 45 of the dies 41 and 42. Air and pipe material 2 in overhang 35
Some of the water leaking from the inside 80 is discharged to the outside through the air escape hole 48.

As a result, as shown in FIG. 10, a connecting material 281 is formed by continuously and integrally connecting three outer rings 21 having substantially uniform thicknesses in the axial direction. At both ends of the thus formed connecting material 281, small-diameter portions 281 a having the same diameter as the pipe material 280 are formed. Are formed at regular intervals in the axial direction. Raise the upper mold 32 and connect the material 2
81, and each bulging portion 282
10 and between the small diameter portion 281a (see FIG. 10).
11), three semi-finished products as shown in FIG. 11 are obtained, and as shown in FIG. 12, the cage 28 is formed by machining the holding holes 28a for holding the balls 27 at six locations in the circumferential direction.
Is completed. If necessary, the inner and outer surfaces of the cage 28 are finished to a spherical surface.

According to the fourth embodiment, 1
Three cages 28 by the material forming process and the dividing process
As a result, the machining lead time per part is shortened, and the amount of cut material cut off at the time of machining is reduced to improve the yield of the material, thereby lowering the manufacturing cost.

In each of the above embodiments, water is used as a pressurizing medium for bulging, but the present invention employs oil,
It can also be carried out using particles such as rubber or small steel balls.

[0024]

According to the present invention, in the material forming step, a core material is not required by bulging, and a connecting material in which a plurality of parts are integrally connected is formed. This connecting material is divided in a subsequent dividing step. By doing so, a plurality of parts are manufactured, so that a plurality of parts can be manufactured by one processing.
As a result, the processing lead time per part is shortened, and the cut-off material is reduced and the yield of the material is improved, so that the manufacturing cost is reduced.

In the invention in which the invention of the preceding paragraph is applied to the production of the outer race of a constant velocity joint, two outer races can be produced by one machining, thereby shortening the machining lead time per outer race. Also, the manufacturing cost is reduced because the yield of the material is improved.

Also, in the invention in which the invention described in the preceding two aspects is applied to the manufacture of a cage of a constant velocity joint, a plurality of cages can be manufactured by one processing, thereby reducing the processing lead time per cage. The manufacturing cost is reduced because the length is shortened and the material yield is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a material forming step of a first embodiment in which a manufacturing method of the present invention is applied to an outer race of a constant velocity joint.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a longitudinal sectional view of a connection material formed by a material forming process according to the first embodiment.

4 is a longitudinal sectional view showing a state in which the connecting material shown in FIG. 3 is divided and a shaft portion is welded.

FIG. 5 is a right side view of FIG.

FIG. 6 is a longitudinal sectional view of a connecting material formed by a material forming step of a second embodiment in which the manufacturing method of the present invention is applied to an outer race of a constant velocity joint.

FIG. 7 is a longitudinal sectional view of a connecting material formed by a material forming step of a third embodiment in which the manufacturing method of the present invention is applied to an outer race of a constant velocity joint.

FIG. 8 is a longitudinal sectional view showing a material forming step of a fourth embodiment in which the manufacturing method of the present invention is applied to a constant velocity joint cage.

9 is a sectional view taken along line 9-9 in FIG. 8;

FIG. 10 is a longitudinal sectional view of a connection material formed by a material forming step according to a fourth embodiment.

11 is a longitudinal sectional view showing a semi-finished product of the cage obtained by dividing the connecting material shown in FIG.

FIG. 12 is a longitudinal sectional view of a cage formed as a finished product by forming holding holes in the semi-finished product shown in FIG. 11;

FIG. 13 is a side view of a drive shaft provided with constant velocity joints at both ends.

[Explanation of symbols]

11, 21 ... outer ring, 28 ... cage, 110, 280 ... pipe material, 111, 111A, 111B, 281 ... connecting material, 111a, 281a ... small diameter portion, 112, 282 ... bulging portion, A, B ... constant velocity Joint.

Claims (3)

[Claims] A plurality of parts having substantially uniform thicknesses are integrally connected in a longitudinal direction to form a radially bulging part in a longitudinal direction and a narrow part in at least one place. A method of manufacturing a constant velocity joint part, comprising: a material forming step of forming the connected material from a pipe material by bulging; and a dividing step of cutting the connected material in the middle in the longitudinal direction and dividing the connected material into a plurality of pieces. 2. The component is an outer race of a constant velocity joint, and the connecting material is formed at a middle portion or both end portions of the bulging portion which is arranged at equal intervals in a circumferential direction and extends in a longitudinal direction. And the cylindrical small diameter portion is formed at both ends or an intermediate portion, and in the dividing step, the connection material is cut at the bulging portion or the small diameter portion formed at the longitudinal middle portion. The method for manufacturing a constant velocity joint part according to claim 1, wherein the part is divided into a plurality of parts. 3. The component is a cage of a constant velocity joint, and the connecting material forms a plurality of bulging portions that are arranged at predetermined intervals in the axial direction and extend in the circumferential direction at an intermediate portion in the longitudinal direction. The connecting material is cut between each of the bulging portions and between each of the bulging portions and each of the small diameter portions in the dividing step. The method for manufacturing a constant velocity joint part according to claim 1, wherein the part is divided into two parts.