JPS6027432A - Method and device for producting outer ring of synchronous universal joint - Google Patents

Abstract

PURPOSE:To reduce the costs of production and assembly by performing simultaneously pressing to yield a rolling groove for rollers and end working to yield a cylindrical shape for welding by using a cylindrical blank material. CONSTITUTION:When a cylindrical blank material W is fitted into an inside die 23 and an upper die 22 is lowered, driven cams 28a, b are pushed by composite cams 30a, b to advance. Then dies 27a, b are advanced into the material W from the side and form a rolling groove for roller by pressing cooperatively with the die 23 in the longitudinal intermediate part of the material. The small-diameter part 32b of a punch 32 is pushed roughly at the same time into the bore part at the top end of the material and as the punch descends, the material W receives the compressive forming force in the axial line direction. The inside and outside diameters thereof are restrained in this time by the part 32b of the punch 32 and the dies 27a, b, by which a prescribed joint part for driving is formed at the top end of the material W.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a constant velocity universal joint outer ring, an apparatus therefor,
More specifically, this article relates to a method and an apparatus for manufacturing an outer ring of a tripod type constant velocity universal joint by punch-forming roller rolling fermentation along the axis of a cylindrical material at equal circumferential pressure points (prior art). The outer ring of a tripod type constant velocity universal joint generally consists of an fB-shaped main body part 1 and a seven-rank part 2 provided at one end, as shown in FIGS. 1 and 2.

In the main body part 1, roller rolling @3 is formed at three equal intervals in the circumferential direction and along the axis. A drive shaft 4 such as a differential side gear shaft is fastened to the seventh rank portion 2 once with a bolt 5.

On the other hand, one end portion of a shaft 7 is mounted in the main body l with a roller 6 engaged in the roller rolling groove 3.

In order to manufacture the outer ring of such a constant velocity universal joint, conventionally the main method used was to finish the material by machining or cutting from a roughly formed or cast material, but in recent years, the material yield rate , for the purpose of reducing processing costs, attempts have been made to finish the circular material by plastic working (Japanese Unexamined Patent Publications No. 56-165536, No. 58-50)
Publication No. 137, etc.).

However, the outer ring of the constant velocity universal joint obtained by the above-mentioned plastic working is still of the flange type having the seven rank portions 2, and must be connected to the drive shaft 4 by bolts 5, which is difficult to assemble. There are problems in that it is time consuming and requires a large number of parts.

(Object of the Invention) In view of the above-mentioned problems of the prior art, the present invention provides a constant-velocity motor that minimizes cutting work and enables welding to the drive shaft, thereby reducing manufacturing costs and assembly costs as much as possible. An object of the present invention is to provide a method for manufacturing a universal joint outer ring and an apparatus therefor.

(Structure of the Invention) The object is to constrain the inner diameter of the cylindrical material and press the outer diameter radially inward to form a roller roll M2IdIt in the longitudinally intermediate portion of the cylindrical material. Step 1 and the first step are performed at the same time.

This is achieved by a manufacturing method and manufacturing clamping that includes a second step of forming a cylindrical shape for welding the drive shaft (Execution N). explain.

First, a row of outer rings of a constant velocity universal joint produced by the method of the present invention are shown: 1 is the one shown in Figures 3 (a) and (b), and one is the outer ring of a constant velocity universal joint. 10 is.

A main body portion 12 having the same roller rolling a11 as described above.

and a ring-shaped drive shaft joint 13 formed at one end.

and a skirt portion 14 formed at the other end. The end surface 13a of the joint portion 13 serves as a welding end surface, and as shown in FIG.
1. ! J Sunateru) will be welded.

FIGS. 5 and 6 show one line of the structure of the apparatus for manufacturing the above-mentioned equiformable four-handed outer ring 10. In these figures, 21 is an upper mold, and 22 is an upper mold.

23, which are fixed to the press bed and press slide (not shown), are the main bomb f24 and the punch 2.
5, which protrudes from the center of the lower mold 21 and has three protrusions 23a on its outer periphery that follow the roller rolling grooves 11 of the constant velocity self-coupling outer ring 10. A knockout plate 26 is fitted into the base of the internal mold 23. The knockout plate 26 is connected to a knockout pin 27 extending from a press knockout (not shown), and is pushed upward as the knockout bin 27 rises.

On the knockout grating 26 and around the internal mold 23, six dice 27a and 27b are arranged at equal intervals. The dies 27a, 27b have their rear ends supported by passive cams 28a, 28b, respectively, and are movable on sliding plates 29 fixed on the passive force A 28a, 28b. It is always urged backward (radially outward of the inner mold 23) by an urging means (not shown). On the other hand, upper M! 22 includes the passive cam 2
Stopping cams 30a and 30b are fixedly installed opposite to 8a and 28b, and when the upper die 22 descends, a stopping force A is applied
30a, 30b engages with the rear end portions of the passive cams 28a, 28b to advance the groove, thereby causing the die 27a to move forward.
, 27b approach the inner mold 23 from the side. In addition, the death cam 30a.

30b is a block 31 whose rear end face is shaped like a dome 21.
It slides into place and stops.

Further, a cylindrical punch 32 is fixed to the upper mold 22 facing the inner mold 23. The punch 32 has a step 32a at its tip and a small diameter portion 32b following the step 32a. In cooperation with the internal mold 23, end processing, which will be described later, is executed.

With this configuration, the cylindrical material W is fitted into the internal mold 23. At this time, most of the cylindrical material W is inside! !
! ! 23, and only a part of the upper end protrudes upward from the internal mold 23. First, when the upper mold 22 is moved to the lower 14 parts, the sr cam 30a,
30bK is pushed and the passive cams 28a and 28b move forward, thereby causing the die 27a to move forward.

27b is a cylindrical material WK#L, which enters from the side and cooperates with the internal mold 23 to press-form a roller roll m#1l11 (FIG. 3) at the longitudinally intermediate portion of the cylindrical material. At the same time as this, the punch 32 inserts its small diameter portion 32b into the inner diameter portion of the upper end of the cylindrical material W.

As the bomb Y-32 descends, the cylindrical material W receives compression molding force in the axial direction, and at this time, its inner and outer diameters
32 small diameter part 32b and die x 27 a + 27 b
The upper layer of the cylindrical material W has a predetermined driving joint 13 (see Figure 3).
is formed. Therefore, due to the above-mentioned pressed book formation,
The joint portion 13 has a welding end surface that is only 25) thicker than the cylindrical material W and has an excellent welding end surface in terms of size, shape, and strength.

In this way, the molded product, that is, the constant velocity universal joint outer ring 10
After passing (See Fig. 3 @), as the upper die 22 rises,
First, since the punch 32 is provided with a punching taper on its small diameter portion 32b, it comes out of the molded product, and then the passive cam 2
8a and 28b retreat.

The dies 27a and 27b are separated from the molded product by 118 mm. After that, the knockout bin 27 is raised by the drive of the press knockout, and the knockout plate 26 follows this to eject the molded product from the internal mold 23.

This completes one process of manufacturing the constant velocity universal joint outer ring 1o.

FIG. 7 shows another example of the apparatus for manufacturing a constant velocity universal joint outer ring according to the present invention. In addition.

Components that are the same as those shown in FIG. 6 are given the same reference numerals, and their explanations will be omitted. The feature of this embodiment is that the bong f32 (corresponding to FIG.

The circular m member 42 is connected via a push pin 44 to a push plate 43 built into the upper mold 22 so as to be movable up and down, and the upper mold 2
The structure is such that the cylindrical member 42 is always biased toward the center by the elastic body 45 installed in the cylindrical member 2.
First, the punch body 41 and the cylindrical member 42 work together to perform the end processing (compression molding of the joint portion 13) on the cylindrical material WK fitted in the internal mold 23, and after forming, the upper mold 22
When the 1 yen ftJ member 42 is pressed against the end face of the molded product, the punch body 41 is first pulled out, and then the cylindrical member 42 is separated from the molded product. The other functions are the same as those of the first embodiment, so their explanation will be omitted.

However, when using the above-mentioned split structure punch.

The punch body 41 can have a straight tip end surface.

A more effective compression molding force is added to the cylindrical material W,
It becomes possible to form the roller rolling pin 11 and drive shaft joint portion 13 of the constant velocity universal joint outer ring 10 with a high degree of precision.

Here, the compression molding force of the cylindrical member 42 can be changed as appropriate by changing the strength of the elastic body 45. (Effects of the Invention) As described above in detail, the present invention is applicable to the production of a constant velocity universal joint outer ring. In this paper, a method and apparatus were realized in which pressing processing to obtain a 0-ra rolling groove and end processing to obtain a cylindrical shape for welding were simultaneously performed using cylindrical wood. It has become possible to minimize cutting work throughout the entire manufacturing process, significantly improving material yield and productivity. In addition, by forming a cylindrical shape for welding with excellent accuracy and strength, it is possible to assemble the drive shaft by welding later, eliminating the need for connecting parts found in conventional flange types.
The overall effect was significant in that it contributed to a significant reduction in manufacturing and assembly costs.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and a side view showing the shape and usage of a conventional constant velocity universal joint outer ring, and Figures 3 (a) and (b).
are a plan view and a cross-sectional view showing the shape of the outer ring of a constant velocity universal joint that is an object of the present invention, FIG. 4 is a cross-sectional view showing the assembly mode of a similar outer ring of a constant velocity universal joint, and FIG. In this invention?
FIG. 7 is a cross-sectional view and a vertical cross-sectional view showing an example of a manufacturing apparatus for a constant velocity universal joint outer ring according to another embodiment of the present invention. FIG. 23...Internal mold 27a, 27b--Dice 28a, 28b...Passive cam 30a, 30b...Death cam 32...Punch 41...Punch body 42...Cylindrical member patent applicant Toyota Jidosha Co., Ltd.

Claims (4)

[Claims] (1) In a method of manufacturing an outer ring of an equal adjustable joint by press-forming eye-to-ra rolling grooves along the @ line at equal circumferential wall pressure positions of a cylindrical material, the inner diameter of the cylindrical material is The first step is to partially restrain the outer diameter of the cylindrical material and press it radially inward to form a #-marked roller rolling groove in the longitudinally intermediate portion of the cylindrical material.
The process of and the process of lI/E1 are y simultaneously. A second step of constraining the inner and outer diameters of the cylindrical material and compressing one end in the axial direction to form a drive shaft joint at one end of the cylindrical material. Production method. (2) The method for manufacturing a constant velocity universal joint outer ring according to claim 1, characterized in that one end portion including the shaft joint surface is formed by KFEa molding to a thickness that is greater than the wall thickness of the cylindrical material. (3) In an apparatus for forming an outer ring of a constant velocity universal joint by press-forming roller rolling grooves along the axis of a cylindrical material at positions with uniform thickness in the circumferential direction, three grooves imitating the roller rolling grooves are formed. Consists of a protrusion. An internal mold into which most of the cylindrical material is fitted, and a Sakumanrikima et al. that enters the fitted cylindrical material and cooperates with the internal mold to press the roller rolling groove. A manufacturing apparatus comprising: a die that performs forming; and a punch that engages one end of the cylindrical material and works with the die to process the end. (4) The apparatus for manufacturing a constant velocity universal joint outer ring according to claim 3, wherein the die is moved forward and backward by a force A mechanism consisting of a passive cam and a bias cam.