JP3690466B2 - Manufacturing method of outer ring member in constant velocity universal shaft joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer ring member in an outer ring part of a constant velocity universal shaft joint and a manufacturing method thereof.
[0002]
[Prior art]
A manufacturing method for manufacturing an outer ring member in an outer ring portion of a constant velocity universal shaft joint according to a conventional technique by press working is disclosed in, for example, Japanese Patent Laid-Open Nos. 9-76026 and 7-317788. There is a way.
In the method disclosed in Japanese Patent Laid-Open No. 9-76026, a low-carbon steel sheet material is cut into a predetermined size and formed by sequentially narrowing with a cold press or the like.
[0003]
Similarly, in the method as disclosed in Japanese Patent Application Laid-Open No. 7-317788, a pipe material is pressed to form an intermediate portion into a shaft member and both ends into an outer ring member.
In any case, a track groove and an inner diameter surface are formed on the inner peripheral surface of the outer ring member.
[0004]
[Problems to be solved by the invention]
In the method disclosed in the above Japanese Patent Laid-Open No. 9-76026 and Japanese Patent Laid-Open No. 7-317788, the amount of drawing in the outer ring member of the outer ring portion is larger in the inner diameter portion than in the groove portion. Becomes uneven in the axial direction. For this reason, it is necessary to finish the opening edges so that the removal amount is large.
Further, in the case of a pipe material, the influence of the restriction is reduced, but the cost is higher than in the case of a plate material.
[0005]
[Means for Solving the Problems]
The method of manufacturing the cup-shaped outer ring member in which the track groove portions with which the inner diameter portions and the rolling elements engage in the constant velocity universal shaft joint according to the present invention are alternately arranged in the circumferential direction includes the following steps. It is out.
[0006]
(1) The diameter of the plate-shaped material for each outer peripheral area so that the edge of the plate-shaped material deeply drawn into a cup shape with a non-circular cross section consisting of an inner diameter portion and a track groove portion is on the same plane after deep drawing. A difference in the amount of flow of the material in the axial direction is given to the squeezing, and the diameter of the portion corresponding to the track groove portion is made smaller than the diameter of the portion corresponding to the inner diameter surface portion to make the plate-like material noncircular.
[0007]
(2) The plate-shaped material formed into a non-circular shape is deep-drawn into a cup shape in which inner diameter portions and track groove portions are alternately arranged in the circumferential direction.
(3) If necessary, a center hole serving as a coupling hole between the outer ring member and the shaft member is formed in the plate-shaped material in advance. And in some cases, the central hole is non-circular so as to be circular after deep drawing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
About the manufacturing method of the outer ring member which is a cup body in which the inner diameter surface in the constant velocity universal shaft joint and the track groove with which the rolling element engages are alternately formed in the circumferential direction in the embodiment of the present invention. First, the constant velocity universal joint itself will be described with reference to the drawings.
A constant velocity universal shaft joint exemplified as a tripod-type shaft joint includes an outer ring portion A in which a cup-shaped outer ring member 1 is coupled to the tip of a shaft member 2 as shown in FIG. For example, an inner ring part B in which an inner ring member 3 in which three tripod shafts rotatably supporting a spherical roller C project radially from the outer circumferential surface at equal circumferential intervals (120 degree intervals) is coupled to the tip of the shaft member 4. Are connected via a spherical roller C. That is, the inner ring member 3 that supports the rolling element C is inserted into the outer ring member 1, and the spherical surface that is supported by the inner ring member 3 in the axial track grooves 11 that are arranged in parallel to the inner circumferential surface of the outer ring member 1. The roller C is engaged.
[0011]
As shown in FIGS. 1 and 2, the outer ring member 1 of the outer ring portion A has a track groove portion 11 that forms a track groove surface 11a with which the spherical roller C is engaged and an inner diameter surface portion 12 that forms an inner diameter surface 12a. It is a cup-shaped body having a non-circular cross section in which the coupling holes 13 are alternately arranged in the circumferential direction in the direction and penetrated through the coupling hole 13 coupled to the shaft member at the center of the bottom. In the example shown in the figure, the track groove portion 11 and the inner diameter surface portion 12 are formed at three locations, respectively, so that the outer ring member 1 has a clover-like cross section.
When the outer ring member 1 is manufactured, the steel plate material M is deep drawn and finished by ironing.
[0012]
When the outer ring member 1 is formed by deep drawing the steel plate material M, the track groove portion 11 has a larger amount of material flow in the axial direction than the inner diameter surface portion 12, and the inner diameter surface portion 12 has a smaller diameter ratio than the track groove portion 11. The flow amount in the circumferential direction is larger than that of the track groove portion 11.
As a result, when the circular steel plate material M ′ is deep-drawn, the opening edge protrudes more in the axial direction in the track groove portion 11 than in the inner diameter surface portion 12 and is not on the same plane. The inner diameter surface portion 12 is thicker than the track groove portion 11.
[0013]
Therefore, the steel plate material M is not formed into a circular shape but is formed into a non-circular shape (see FIG. 3) in which a difference in the amount of material flow in the axial direction is given to the diameter of each circumferential section. That is, the diameter of the portion corresponding to the track groove portion 11 is made smaller than the diameter of the portion corresponding to the inner diameter surface portion 12 by the difference in the amount of material flow in the axial direction during deep drawing.
[0014]
And the hole used as the joint hole 13 of the bottom part of the outer ring member 1 is punched in the center part of the steel plate raw material M previously.
This also suppresses the generation of wrinkles due to the restriction of the material flow during deep drawing.
[0015]
However, since there is a difference in the amount of material flow in the axial direction between the track groove portion 11 and the inner diameter surface portion 12, if the hole punched in advance is circular, the coupling hole 13 is non-circular. In the example shown in the figure, the track groove portion 11 and the inner diameter surface portion 12 are formed in three places, so that the coupling hole 13 is a rounded triangle.
[0016]
Therefore, the hole punched in advance in the central portion of the steel plate material M is not circular, but is formed into a non-circular shape in which a difference in the amount of material flow in the axial direction is given to the hole diameter of each circumferential section during deep drawing. That is, the diameter of the portion corresponding to the track groove portion 11 is made smaller than the diameter of the portion corresponding to the inner diameter surface portion 12 by the difference in the amount of material flow in the axial direction during deep drawing. In the example shown in the figure, the track groove portion 11 and the inner diameter surface portion 12 are formed at three locations, so that the portion corresponding to the inner diameter surface portion 12 has a rounded triangle with a long diameter. (See Figure 3)
[0017]
As a result, when the steel plate material M is deep-drawn, the previously formed non-circular coupling hole 13 becomes a circular coupling hole 13.
The non-circular to circular coupling hole 13 is formed into an appropriate shape for coupling with the shaft member 2 such as a perfect circle or serration by punching or cutting.
[0018]
Under the conditions as described above, the outer ring member 1 of the outer ring portion A is manufactured by the following steps.
(1) The non-circular steel plate material M as described above is punched from the steel plate by pressing, and the non-circular coupling holes 13 are punched in a predetermined circumferential direction phase relationship with the outer peripheral shape of the steel plate material M. (See Figure 3)
(2) The steel plate material M is round-drawn into a cylindrical cup shape with a punch and a die having a circular cross section by pressing. (See Fig. 4 (a))
[0019]
(3) By pressing in a two-step process, a cylindrical cup-shaped intermediate molded product is formed into a predetermined non-circular cross section, that is, the track groove portions 11, 11, 11 with a punch and a die having a non-circular cross section (for example, a clover-shaped cross section) And a cup-shaped body in which the inner surface portions 12, 12, and 12 are alternately drawn. (See FIGS. 4B and 4C)
(4) The outer peripheral surface portion of the deep-drawn cup-shaped body is finished with a predetermined size and shape by ironing. (See Fig. 4 (d))
[0020]
Thus, the opening edge is substantially on the same plane, the substantially circular coupling hole 13 is formed at the bottom, and the outer ring member 1 in the constant velocity universal shaft joint having a predetermined cross section is manufactured.
Since the opening edge is substantially on the same plane, the finish cutting for the opening edge is not required, or the amount of finishing cutting is small.
[0021]
Similarly, when it is necessary to form the coupling hole 13 into a perfect circle or serration for coupling with the shaft member 2, the punching amount or the cutting amount in molding such as a perfect circle or serration is small because it is substantially circular. .
In addition, description about the coupling | bonding of the outer ring member 1 and the shaft member 2 is abbreviate | omitted.
The constant velocity universal shaft coupling in the above embodiment is a tripod type shaft coupling, but may be another type of constant velocity universal shaft coupling such as a Barfield type shaft coupling.
[0022]
【The invention's effect】
According to the manufacturing method of the outer ring member in the constant velocity universal shaft joint of the present invention, the outer ring member is formed with a plate-like material, so that the thickness of the outer ring member is substantially uniform, unlike forging. Material costs are low. Moreover, there is no problem that the edge of the opening is not uniform when the plate-shaped material is deep drawn into a cup shape with a non-circular cross section. Accordingly, finishing of the opening edge is not necessary, and even if finishing is performed, the finishing amount is small and the productivity is good.
[0023]
Furthermore, if a center hole serving as a coupling hole between the outer ring member and the shaft member is formed in advance in the plate-like material, the flow of the material is not restrained in deep drawing, and the generation of wrinkles is suppressed.
In addition, by making the center hole non-circular in consideration of the difference in the amount of material flow in the axial direction during deep drawing so that the center hole becomes circular after deep drawing, the coupling hole for subsequent coupling of the outer ring member and the shaft member It is also efficient in forming.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a constant velocity universal shaft joint in which an outer ring member manufactured by a manufacturing method according to an embodiment of the present invention is used.
FIG. 2 is a front view of an outer ring member manufactured by the manufacturing method according to the embodiment of the present invention.
FIG. 3 is a plan view of a steel plate material used in the outer ring member manufacturing method according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view of a molded product in each step of the method for manufacturing the outer ring member according to the embodiment of the present invention.
[Explanation of symbols]
A outer ring portion 1 outer ring member 11 track groove portion 11a track groove surface 12 inner diameter surface portion 12a inner diameter surface 13 coupling hole 2 shaft member B inner ring portion 3 inner ring member 4 shaft member C spherical roller (rolling element)
M, M 'Steel plate material (plate material)

Claims (2)

A manufacturing method including the following steps for manufacturing a cup-shaped outer ring member in which track groove portions with which an inner diameter portion and rolling elements are engaged in a constant velocity universal shaft joint are alternately arranged in the circumferential direction.
(1) A plate-like material that is deep-drawn into a cup shape with a non-circular cross-section composed of an inner diameter portion and a track groove portion is arranged for each outer peripheral area of the plate-like material so that the opening edges after deep drawing are substantially on the same plane . When the diameter is reduced, a difference in the amount of material flow in the axial direction is given, and the diameter of the portion corresponding to the track groove portion is formed smaller than the diameter of the portion corresponding to the inner diameter surface portion .
(2) The plate-shaped material formed into a non-circular shape is deep-drawn into a cup shape in which inner diameter portions and track groove portions are alternately arranged in the circumferential direction. The method according to claim 1, wherein a center hole serving as a coupling hole between the outer ring member and the shaft member is previously formed in the plate-shaped material as a non-circular hole that becomes circular after deep drawing .

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