JP4344425B2 - Manufacturing method of outer ring member for constant velocity joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an outer ring member for a constant velocity joint constituting a constant velocity joint.
[0002]
[Prior art]
Conventionally, for example, a constant velocity joint has been adopted in a power transmission device of an automobile in order to obtain a smooth rotational force without being affected by an angle of a driven shaft. As this type of constant velocity joint, there are known a bar field type in which a rotational force is provided by a ball bearing and a tripod type in which the rotational force is provided through at least three rollers.
[0003]
In this case, each of the constant velocity joints of the barfield type and tripod type is provided integrally with the shaft portion and the diameter of the shaft portion from the end portion of the shaft portion, and a plurality of track grooves are formed on the inner peripheral surface thereof. An outer ring member constituted by the formed cup portion is provided.
[0004]
For example, when manufacturing an outer ring member constituting a Barfield type constant velocity joint, a shaft portion is formed by subjecting a rod-shaped member cut to a predetermined length to forward extrusion, while upsetting molding is performed. The cup portion is integrally formed with the shaft portion by performing various forging such as rear extrusion molding and ironing molding.
[0005]
By the way, when manufacturing an outer ring member using such a forging method, intermediate processing such as annealing and bonding is required between various forging and molding processes. Intermediate processing is required.
[0006]
Further, in the forging, there is a problem that it is difficult to reduce the thickness of the outer ring member because the surface pressure of the molding surface of the obtained molded body is extremely high.
[0007]
Therefore, for example, in Japanese Patent Laid-Open No. 9-29380, as shown in FIGS. 8 and 9, a cup portion is formed by narrowing one end portion of a high carbon steel pipe material cut to a predetermined size by cold pressing. 1 is formed, and the base portion of the shaft portion 2 formed by roll rolling or the like from a round material is welded to the center of the cup portion 1 to integrate the cup portion 1 and the shaft portion 2; A technical idea for performing a surface hardening treatment is disclosed.
[0008]
[Problems to be solved by the invention]
However, in the technical idea disclosed in the above-mentioned Japanese Patent Laid-Open No. 9-29380, the flange 3 of the cup part 1 has irregularities, so that a boot band (FIG. (Not shown) becomes a special shape corresponding to the uneven shape, so that it is necessary to manufacture a boot band having a special shape instead of a conventional boot band that has been used conventionally, so that the manufacturing cost rises There is a problem of doing.
[0009]
Further, there is a risk that the tightening strength of the boot band is insufficient, or oil leakage occurs from the gap between the flange 3 of the cup portion 1 and the boot.
[0010]
The present invention has been made in consideration of the above-mentioned problems, and can use a boot band that has been conventionally used as it is, and the thickness of the cup portion is reduced to reduce the weight. It is another object of the present invention to provide a method for manufacturing an outer ring member for a constant velocity joint that can reduce manufacturing costs.
[0011]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a method for manufacturing an outer ring member for a constant velocity joint comprising a cup portion having an opening and a shaft portion that protrudes from and joins one end of the cup portion. ,
A step of reducing the diameter of one end of a tubular body that is produced by cutting a pipe and is open at both ends;
A plurality of depressions separated from each other at equal intervals along the circumferential direction of the tubular body from the starting point to the one end portion reduced in diameter from the other end portion of the tubular body. Forming the bulging portion between the depressions and forming the cup portion, the top surface of which is connected to the outer peripheral surface of the other end portion on the same peripheral surface;
After closing the opening by inserting the shaft portion into the opening of the reduced-diameter front Symbol one end of the cup portion, an outer ring for a constant velocity joint by bonding the shaft portion and the cup portion to each other A process of making a member;
Have
The outer peripheral surface of the other end portion in which the opening portion remains in the cup portion is a flange portion having a substantially circular cross section for mounting a boot band.
[0012]
In this case, the top surface of the flange portion and the swollen portion, Ru is formed on the same circumference having the same radius of curvature. This ensures that the shape of the cup portion can be downsized and simplified.
[0013]
According to the present invention, in the outer ring member for a constant velocity joint including a cup portion having an opening and a shaft portion protruding from and joined to one end portion of the cup portion, the flange portion is formed in a substantially circular cross section. By doing so, the conventionally used boot band can be attached to the flange portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the method for manufacturing an outer ring member for a constant velocity joint according to the present invention will be described in detail below with reference to the accompanying drawings.
[0015]
In FIG. 1, reference numeral 10 indicates an outer ring member for a constant velocity joint manufactured by the manufacturing method according to the present embodiment.
[0016]
The constant velocity joint outer ring member 10 includes a cup portion 12 and a shaft portion 14, and the cup portion 12 and the shaft portion 14 are integrally formed by welding or the like. A substantially circular opening 16 is formed at one end of the cup 12, and a flange having a substantially circular cross section for attaching a boot band 18 (see FIG. 2) to the outer peripheral surface of the opening 16. 20 is formed.
[0017]
Further, as shown in FIG. 3, the cup portion 12 is formed with three bulging portions 22a to 22c that are separated by an angle of about 120 degrees along the circumferential direction and extend along the axial direction. Track grooves 24a to 24c are formed on the inner wall surfaces of the bulging portions 22a to 22c. Concentric circular arc portions 25a to 25c are formed between the adjacent bulging portions 22a to 22c.
[0018]
In this case, the top surfaces 26 of the flange portion 20 and the bulging portions 22a to 22c are respectively formed on peripheral surfaces having substantially the same radius of curvature. Therefore, the shape of the cup part 12 can be simplified and reduced in size.
[0019]
The other end portion of the cup portion 12 is narrowed by press molding to be described later, thereby forming a shoulder portion 28 that gradually decreases in diameter from the bulging portions 22a to 22c toward the shaft portion 14 side (FIG. 2).
[0020]
As shown in FIG. 6, the shaft portion 14 has a substantially cylindrical shape, and center holes 30 and 32 are formed coaxially on both end surfaces along the axial direction. An annular step 34 is formed.
[0021]
Next, the manufacturing method of the outer ring member 10 for a constant velocity joint according to the embodiment of the present invention will be described below.
[0022]
First, the manufacturing process of the cup part 12 is demonstrated.
[0023]
For example, a tubular body 36 such as a pipe having both ends opened is cut to a predetermined size (see FIG. 4A), and intermediate processing is performed on the cut tubular body 36. That is, the tubular body 36 is subjected to a lubrication process such as an annealing process, a shot blast process, and a bond process (see FIGS. 4B and 4C). After the track groove and the shoulder portion are press-molded by the press-forming devices 38 and 40 (see FIGS. 4D and 4E) on the tubular body 36 subjected to the intermediate treatment (see FIGS. 4D and 4E), lace processing is performed on both end faces of the tubular body 36, respectively. The cup part 12 is formed by performing (refer FIG. 4F).
[0024]
In the present embodiment, the use of the thin tubular body 36 allows the constant velocity joint outer ring member 10 to be made thinner.
[0025]
Next, the manufacturing process of the shaft part 14 performed separately and in parallel with the cup part 12 will be described.
[0026]
After the cylindrical body 44 in which the rod-like member 42 has been cut to a predetermined size (see FIG. 5A), after performing an intermediate process such as an annealing process, a shot blast process, and a bonde process (see FIGS. 5B and 5C), Forming bodies 46 and 48 are obtained by subjecting the cylindrical body 44 to forging molding including two steps (see FIGS. 5D and 5E). Further, in the forming body 48, the joining with the cup portion 12 is performed. The shaft portion 14 is formed by performing lace processing on the portion (see FIG. 5F). In FIG. 6, a two-dot chain line indicates the shape of the shaft portion 14 in a state before the lace processing is performed.
[0027]
The shaft portion 14 is press-fitted into one end portion of the cup portion 12 which is manufactured separately and in parallel in this way (FIG. 7A), and the joint portion between the cup portion 12 and the shaft portion 14 is not shown. By welding with the laser beam 50 irradiated from the laser beam generating means, the cup portion 12 and the shaft portion 14 are integrally coupled (see FIG. 7B). Subsequently, after sizing the band groove 52 for mounting the boot band 18 (see FIG. 7C), the carburizing process and the polishing process are finally performed (FIG. 7D), and the like as a product. The outer ring member 10 for the speed joint is completed.
[0028]
In the present embodiment, since the flange portion 20 of the cup portion 12 to which the boot band 18 is attached is formed in a substantially circular cross section, it is possible to use the boot band 18 that has been conventionally used as it is. it can. Therefore, there is no need to use a specially shaped boot band as in the prior art, and the manufacturing cost can be reduced.
[0029]
Moreover, since the cup part 12 is formed by plastically deforming the tubular body 36, weight reduction can be achieved by making the thickness of the cup part 12 much thinner.
[0030]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0031]
That is, by forming the flange portion in a substantially circular cross section, a conventionally used boot band can be attached to the flange portion. As a result, since it is not necessary to manufacture a specially shaped boot band, the manufacturing cost can be reduced.
[0032]
Moreover, since the cup part is formed by plastically deforming the tubular body, it is possible to reduce the weight by further reducing the thickness of the cup part.
[Brief description of the drawings]
FIG. 1 is a perspective view of an outer ring member for a constant velocity joint according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view along the axial direction of the outer ring member for constant velocity joint.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4A to FIG. 4F are explanatory views showing the manufacturing process of the cup part, respectively.
FIG. 5A to FIG. 5F are explanatory views showing a manufacturing process of a shaft portion, respectively.
FIG. 6 is a partial cross-sectional view of a shaft portion formed by the manufacturing process.
7A to 7D are explanatory views showing a manufacturing process of an outer ring member for a constant velocity joint by joining the cup portion and the shaft portion, respectively.
FIG. 8 is a partial cross-sectional view of a constant velocity joint outer ring member according to the prior art.
9 is a side view of the constant velocity joint outer ring member shown in FIG. 8. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Outer ring member for constant velocity joints 12 ... Cup part 14 ... Shaft part 16 ... Opening part 18 ... Boot band 20 ... Flange part 22a-22c ... Projection part 24a-24c ... Track groove 25a-25c ... Arc part 26 ... Top Surface 28 ... shoulder 36 ... tubular body

Claims (1)

In the method of manufacturing an outer ring member for a constant velocity joint composed of a cup portion having an opening and a shaft portion protruding from and joined to one end portion of the cup portion,
A step of reducing the diameter of one end of a tubular body that is produced by cutting a pipe and is open at both ends;
A plurality of depressions separated from each other at equal intervals along the circumferential direction of the tubular body from the starting point to the one end portion reduced in diameter from the other end portion of the tubular body. Forming the bulging portion between the depressions and forming the cup portion, the top surface of which is connected to the outer peripheral surface of the other end portion on the same peripheral surface;
After closing the opening by inserting the shaft portion into the opening of the reduced-diameter front Symbol one end of the cup portion, an outer ring for a constant velocity joint by bonding the shaft portion and the cup portion to each other A process of making a member;
Have
A manufacturing method of an outer ring member for a constant velocity joint, wherein an outer peripheral surface of the other end portion in which the opening remains in the cup portion is a flange portion having a substantially circular cross section for mounting a boot band.

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