JPH10267040A - Manufacture of drive shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacture method of a drive shaft whereby necessity for troublesome welding is eliminated, fixing is simple and sure, and a life can be improved. SOLUTION: In a manufacture method of a drive shaft having a joint yoke 2 and a spline shaft connected to a shaft fitting hole 3 of this joint yoke 2, the spline shaft is formed as a hollow spline shaft 6 with a uniform section in an axial line direction over a length total unit, in the shaft fitting hole 3, a spline with a section not uniform in an axial line direction is formed, from an inner side part of the hollow shaft 6 spline fitted to the shaft fitting hole 3 in a sectional shape not uniform in an axial line direction of the shaft fitting hole 3, for instance, in a shape conformed to a tapered part 7 of a small diametric part, a fixing plug 8 and a caulking jig 10 are used, and the follow spline shaft 6 is deformed to be fixed.

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 drive shaft having a joint yoke and a spline shaft connected to a shaft fitting hole of the joint yoke.

[0002]

2. Description of the Related Art Conventionally, such a drive shaft is shown in FIG.
As shown in FIG. 1, the spline shaft 1 is constituted by a solid spline shaft, and the shaft fitting hole 3 of the joint yoke 2 is formed.
Is formed in a uniform cross-sectional shape over the entire length, a shoulder is formed at the end of the spline shaft 1 by step processing, and this shoulder is engaged with the end face of the yoke fitting hole, and FIG. 1), or by a caulking portion 5 or both as shown in FIG. 1 (c).

[0003]

However, the fixing method by welding requires a troublesome welding process, and may cause welding cracks or fatigue fracture from a welded portion. Furthermore,
A simple crimped portion at the end also tends to cause fatigue failure quickly, and has a drawback that the life of the drive shaft is short.

Accordingly, it is an object of the present invention to provide a method of manufacturing a drive shaft which does not require complicated welding, can be easily and securely fixed, and can prolong its life.

[0005]

In order to achieve this object, a method for manufacturing a drive shaft according to the present invention is characterized in that the spline shaft is a hollow spline shaft having a uniform cross section over its entire length, and the spline shaft is axially inserted into a shaft fitting hole. Forming a spline having a non-uniform cross-sectional shape, and deforming and fixing the inner portion of the hollow spline shaft that is spline-fitted to the shaft fitting hole into a shape adapted to the non-uniform cross-sectional shape of the shaft fitting hole. It is characterized by.

According to the present invention, a secure fixation is achieved by generating a deformation adapted from inside the hollow spline shaft having a uniform cross section in the axial direction to a shaft fitting hole having a non-uniform cross-sectional shape.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a first embodiment of the present invention. In this embodiment, as shown in FIG. 2B, the spline shaft has a uniform cross section in the axial direction over the entire length. As shown in FIG. 2A, the hollow spline shaft 6 has a cross-sectional shape that is not uniform in the axial direction of the spline of the shaft fitting hole 3 of the joint yoke 2. And a tapered portion 7 that tapers toward the front of the joint yoke.

A spline-shaped fixing plug 8 fitted to the hollow spline shaft 6 is spline-fitted to the spline fitting hole 3 of the joint yoke 2, and a spline-shaped fixing plug 8 is fitted on the opposite side of the yoke side of the shaft. And a spline having the same cross section as a fixing plug 8 fitted to the hollow shaft 5 or a cylindrical body having the same shape as the small diameter of the hollow spline shaft 5 toward the tapered portion 7 of the shaft fitting hole 3. The shaft 9 is pushed in to be exposed from the shaft fitting hole 3. At this time, the outer surface of the fixing plug 8 is deformed in a tapered shape by the tapered portion 7 of the small diameter portion of the shaft fitting hole 3 of the joint yoke 2. Next, the fixing plug 8
The portion exposed from the shaft fitting hole 3 is caulked with a caulking tool 10 from the front of the yoke. As a result, the hollow spline shaft 6 and the joint yoke 2 are firmly fixed (see FIG. 2C).

FIG. 3 shows a second embodiment of the present invention. In this embodiment, as shown in FIG. 3B, the spline shaft has a uniform cross section in the axial direction over the entire length. Hollow spline shaft 6 and joint yoke 2
The non-uniform cross-sectional shape of the shaft fitting hole 3 in the axial direction of the spline is an annular recess 11 extending in the circumferential direction of the inner peripheral surface of the spline as shown in FIG.

A hollow spline shaft 6 spline-fitted into the spline fitting hole 3 of the joint yoke 2 has:
Inserting a fixing jig 13, which can be expanded radially outward and having a projection 12 penetrating the annular recess 11, into the interior of the hollow spline shaft 6, and then expanding the fixing jig 13. As a result, the hollow spline shaft 6 expands and deforms so as to fit closely into the annular recess 11. As a result, the hollow spline shaft 6 and the joint yoke 2 are firmly fixed (see FIG. 3C).

In the illustrated embodiment, the non-uniform cross-sectional shape of the spline of the spline fitting hole of the joint yoke in the axial direction is a tapered portion or an annular recess. However, another non-uniform cross-sectional shape is used. Needless to say, the joint yoke fitting portion of the hollow spline shaft can be deformed to fit.

[0013]

According to the present invention, it is possible to fit a shaft fitting hole having a non-uniform cross section in the axial direction from the inside of a uniform spline hollow shaft without requiring a step forming process or a welding process on the shaft. Since the hollow spline shaft can be easily and reliably fixed to the joint yoke by causing the deformation, the effects of reducing costs, hardly causing fatigue fracture, and improving the life are obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a drive shaft manufactured by a conventional manufacturing method, in which (a) is a longitudinal sectional view of a spline shaft;
(B) is a side view showing a partial cross section of a conventional example in which a spline shaft is fixed to a joint yoke by welding, and (c) is a side view showing a partial cross section of a conventional example in which a spline shaft is fixed to a joint yoke by caulking. is there.

FIGS. 2A and 2B are explanatory views of a drive shaft manufactured according to the first embodiment of the manufacturing method of the present invention, wherein FIG. 2A is a side view showing a partial cross section before assembly, and FIG. FIG. 3C is a side view showing a partial cross section of the drive shaft after fixing.

3A and 3B are explanatory views of a drive shaft manufactured by a second embodiment of the manufacturing method of the present invention, in which FIG. 3A is a side view showing a partial cross section before assembly, and FIG. 3B is a hollow spline shaft. FIG. 3C is a side view showing a partial cross section of the drive shaft after fixing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spline shaft 2 Joint yoke 3 Shaft fitting hole 4 Weld part 5 Caulking part 6 Hollow spline shaft 7 Taper part 8 Fixing plug 9 Spline shaft 10 Caulking tool 11 Annular recess 12 Projection 13 Fixing jig

Claims (3)

[Claims] 1. A method of manufacturing a drive shaft having a joint yoke and a spline shaft connected to a shaft fitting hole of the joint yoke, wherein the spline shaft is a hollow spline shaft having a uniform cross section over the entire length.
A spline having a non-uniform cross-sectional shape in the axial direction is formed in the shaft fitting hole, and a shape adapted to the non-uniform cross-sectional shape of the shaft fitting hole from an inner portion of the hollow spline shaft that is spline fitted into the shaft fitting hole. A method for manufacturing a drive shaft, wherein the drive shaft is deformed and fixed. 2. A non-uniform cross-sectional shape of a shaft fitting hole of the joint yoke is a shape in which a small-diameter portion of the shaft fitting hole is tapered toward the front of the joint yoke.
A fixing plug is inserted into the hollow spline shaft from the end opposite to the yoke side of the shaft, and is pushed toward the tapered portion of the shaft fitting hole to be exposed from the shaft fitting hole. The method for manufacturing a drive shaft according to claim 1, wherein the drive shaft is fixed by caulking with a caulking jig from the front. 3. A non-uniform cross-sectional shape of the shaft fitting hole is an annular recess extending in a circumferential direction of an inner peripheral surface of a spline, and a fixing jig is press-fitted into a spline-fitted hollow spline shaft. The method for manufacturing a drive shaft according to claim 1, wherein the drive shaft is fixed by expanding along the recess.