JPH01303319A - Uniform joint - Google Patents

Abstract

PURPOSE:To increase the maximum joint angle by providing a shaft comprising an inner race side thereof made of high tensile steel and the other part thereof made of common steel and making the shaft part abutted upon the opening end of an outer race smaller in diameter. CONSTITUTION:A shaft part 13a having a shaft length of L1 which is abutted upon the opening end of an outer race, with the maximum joint angle of theta, is made of high tensile steel. The shaft part 13b to which an inner race 14 is inserted is integrated with the other shaft part 13c in a predetermined shaft length L3 with common steel. The shaft part 13a made of high tensile steel is integrated with the other shaft parts 13b, 13c by joining the facing parts 30a, 30b through welding, frictional welding or the like and welding beads or burr is cut off after joint. Thus, it is possible to increase the maximum joint angle.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a constant velocity joint used in a driving force transmission shaft of an automobile or the like.

<Prior art> As shown in FIG. 3, a general constant velocity joint disclosed in Japanese Patent Publication No. 33-1305, etc. has a concave arc-shaped bowl 12 extending in the axial direction on a spherical inner peripheral surface. An outer race 11 is formed at angular intervals, has an open end at one end and a stem 10 (or flange) at the other end, and is fitted with a spline to one end of a shaft 13 coaxial with the stem 10, and the outer periphery is connected to the outer race. The inner race 14 has a convex curved surface corresponding to the concave arc-shaped spring 12 of 11, and has a convex arc-shaped basin 15 extending in the axial direction at a position corresponding to the concave arc-shaped spring 12 on the outer periphery of the inner race 14. , the concave arc-shaped groove 12 and the convex arc-shaped groove 1
a ball 22 rotatably interposed between the outer race 11 and the inner race 14, and a gauge 20 that holds the ball 22 in a holding window 21;
It is composed of. A dustproof boot 23 is fitted between the opening E1 at one end of the outer lace 11 and the shaft.

<Problems to be Solved by the Invention> The maximum joint angle θ of this type of constant velocity joint is an angle that can be taken until the shaft 13 comes into contact with the opening edge of the outer race 11. In general, the maximum joint angle θ is limited to 45° to 47.5'.

In order to obtain the maximum joint angle θ of 47.5° or more, either reduce the diameter of the shaft 13 that contacts the open edge of the outer race 11, or increase the amount of chamfering of the open edge of the outer race 11. Either you do it or you do it.

However, the shaft 13 is made of ordinary steel, and reducing its diameter reduces the strength required to transmit rotational torque. Furthermore, if the chamfering of the opening edge of the outer race 11 is increased, the length of the concave arc-shaped groove 12 becomes shorter, causing the problem that the ball 22 may pop out at the maximum joint angle.

Means for Solving the Problems> The present invention has been made in view of the above-mentioned conventional problems.
Its characteristic structure is that concave arc-shaped grooves extending in the axial direction are formed at equal angular intervals on the spherical inner circumferential surface, and the outer race has an open end at one end and a stem or flange at the other end; Alternatively, it is spline-fitted to one end of the shaft that is coaxial with the flange, and has a convex curved surface on the outer periphery corresponding to the concave arc-shaped groove of the outer race, and has an axial direction on this outer periphery at a position corresponding to the concave arc-shaped groove. an inner race having a convex arc-shaped groove extending therein, a ball rotatably interposed between the concave arc-shaped groove and the convex arc-shaped groove, and a rotatable ball between the outer race and the inner race. and a cage for holding the ball,
The shaft has a strong steel shaft on the inner race side and an ordinary steel shaft on the other parts, and the two shafts are integrated by welding or the like, and the part that contacts the outer race of the strong steel shaft at the maximum joint angle is made of a small diameter. This is what I did.

Effects> With the above configuration, the present invention reduces the diameter of the shaft without reducing its strength, and increases the maximum joint angle based on this.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 11 denotes an outer race, which has an open end and a stem 10 integrally formed at the other end. The inner circumferential surface of the outer race 11 is spherical, and concave arc-shaped grooves 12 extending in the axial direction are formed at equal angular intervals.

Fl! ! As a modification, the stem 10 may be replaced with a flange that is attached to the shell terminal reduction gear.

Reference numeral 13 denotes a shaft disposed coaxially with the stem 10. An inner race 14 is attached to one end of this shaft 13.
is fitted with a spline. The inner race 14 has a convex curved outer circumference corresponding to the spherical inner circumferential surface of the outer race 11, and the concave arc-shaped bowl 1 is formed on this outer circumference.
A convex arc-shaped spring 15 extending in the axial direction at a position corresponding to 2
is formed.

Further, a ball 22 is rotatably interposed between the concave arc-shaped full 12 and the convex arc-shaped clear 15.

This ball 22 has an outer lace 11 and an inner lace 1.
4, and is held by a cage 20 having a ball holding window 21. 23 indicates boots.

In the present invention, in the constant velocity joint as described above, the shaft 13 has the following configuration.

That is, when the large joint angle θ is taken, the shaft portion 1 of the portion that comes into contact with the opening edge of the outer race 11 has the shaft length L1.
3a is a strong steel shaft of SN0M26, for example, and includes a shaft portion 13b into which the inner race 14 is fitted and another shaft portion 13c.
The required shaft length L3 is integrally fixed by a common steel shaft (for example, SCM, SC). Shaft portion 13a of this strong steel shaft
In order to integrate the shaft portions 13b and 13c with the other shaft portions 13b and 13c, these contact portions 30a and 30b are connected by welding, friction welding, etc., and the weld bead and burr 31 generated at this time are cut off and removed after the connection.

In the above solid line example, only the shaft portion 13a is made of a strong steel shaft, but the shaft length L2 between this shaft portion 13a and the shaft portion 13b to which the inner race 14 is fitted may be made of a strong steel shaft.

In any of the above configurations, the diameter of the shaft portion 13a is made small.

Since the present invention has the above-described configuration, when the maximum joint angle θ is set as shown in FIG.
The shaft portion 13a contacts the open end edge of the outer race 11, but since the diameter of this shaft portion 13a is small, the maximum joint angle θ is increased by the smaller diameter.

Moreover, since the shaft portion 13a is made of a strong steel shaft, even if the diameter is reduced, sufficient torsional strength, that is, strength necessary for transmitting rotational torque, is ensured.

<Effects of the Invention> As described above, according to the present invention, in the shaft to which the inner race is fitted, when the outer race is opened at least at the maximum joint angle, the shaft portion of the portion that abuts the opening edge of the outer race is made of strong steel. The other parts of the shaft are made of ordinary steel, and these two shafts are connected and integrated, and the outer race is opened [1].
Since the shaft portion that abuts the end edge is configured to have a smaller diameter, the maximum joint angle can be increased without changing the shape or structure of the joint portion or reducing the strength of the shaft.

Furthermore, since the expensive strong steel shaft is a part of the entire shaft, and the other shaft parts are ordinary steel shafts, the maximum joint angle can be increased at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view at the maximum joint angle, and FIG. 3 is a sectional view of a conventional structure. 10... Stem, 11... Outer lace, 12...
・Concave arc shape, 13-...shaft, 13a, 13
b, 13c--Shaft part, 14--Inner race,
15...Convex arc-shaped corner, 20...Cage, 22...
·ball. Patent applicant Yutaka “11ki Co., Ltd.”

Claims (1)

[Claims] an outer race having concave arc-shaped grooves extending in the axial direction formed at equal angular intervals on the spherical inner circumferential surface, one end of which is open and the other end provided with a stem or flange; A convex arc-shaped surface is spline-fitted to one end of the shaft, and has a convex curved surface whose outer periphery corresponds to the concave arc-shaped groove of the outer race, and which extends in the axial direction at a position corresponding to the concave arc-shaped groove on the outer periphery. an inner race having a groove formed therein; a ball rotatably interposed between the concave arc-shaped groove and the convex arc groove; and a ball rotatably interposed between the outer race and the inner race. In a constant velocity joint consisting of a holding cage, the shaft has a strong steel shaft on the inner race side and an ordinary steel shaft on the other parts,
A constant velocity joint characterized in that the two shafts are integrated by welding or the like, and the diameter of the portion that contacts the outer race of the strong steel shaft at the maximum joint angle is reduced.