JPH06101719A - Spline connection structure - Google Patents

Abstract

PURPOSE:To secure a press-fit margin in the tooth thickness direction so as to prevent play in the rotating direction, and reduce a press-fit load in the case where an outer spline of a male member is press-fitted to an inner spline of a female member. CONSTITUTION:A tooth thickness at both ends 3a, 3b in the tooth direction of an outer spline 3 is increased go that a press-fit margin alpha in the tooth thickness direction is secured at both ends 3a, 3b between the outer spline 3 and an inner spline 4. Consequently, a press-fit load can be reduced since a press-fit portion is limited to both ends 3a, 3b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spline coupling structure applied to the case where a gear is fixed to a shaft of a transmission of an automobile, and more specifically, an outer spline formed on a male member such as a shaft is a gear or the like. The spline connection structure for connecting both members by press-fitting an inner spline formed on the female member.

[0002]

2. Description of the Related Art Conventionally, when the outer spline of a male member is press-fitted to the inner spline of a female member, the method described in Japanese Utility Model No. 59-
As disclosed in Japanese Patent No. 7621, it is general to make the tooth tip of the outer spline larger than the root diameter of the inner spline to secure a press-fitting margin in the tooth height direction of both splines.

[0003]

If the press-fitting margin is secured in the tooth length direction as described above, a clearance remains between the tooth side surfaces of the outer spline and the inner spline, and the transmission torque between the male member and the female member is left. There is play in the direction of rotation due to the influence of.
In this case, it is conceivable to increase the tooth thickness of the outer spline to secure the press-fitting margin in the tooth thickness direction, but this increases the press-fitting load and makes fitting difficult. In view of the above points, an object of the present invention is to provide a spline coupling structure capable of ensuring a press-fitting margin in the tooth thickness direction, preventing play in the rotational direction, and reducing the press-fitting load.

[0004]

[Means for Solving the Problems] In order to achieve the above object,
The present invention relates to a spline connection structure in which an outer spline of a male member is press-fitted into an inner spline of a female member to connect a male member and a female member, in a tooth trace direction of at least one of the outer spline and the inner spline. It is characterized in that the tooth thickness at both ends is increased and a press-fitting margin in the tooth thickness direction is secured at the both ends.

[0005]

Since the press-fitting margin in the tooth thickness direction is secured between the outer spline and the inner spline, play in the rotational direction is prevented. Further, since the press-fitting margin is secured only at both end portions in the tooth trace direction, the press-fitting load is reduced as compared with the case where the press-fitting margin is secured over the entire length in the tooth trace direction.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, 1 is a male member such as a shaft, 2 is a female member such as a gear, and the outer peripheral surface of the male member 1 and the inner peripheral surface of the female member 2 are involute-shaped outer parts, respectively. The spline 3 and the inner spline 4 were formed, and the outer spline 3 was press-fitted into the inner spline 4 to join the male member 1 and the female member 2.

As shown in FIG. 2, the outer spline 3 is formed such that the tooth thicknesses at both end portions 3a, 3b in the tooth trace direction are larger than that of the intermediate portion 3c, and the outer spline 3 and the inner spline 4 are formed. In between, as shown in FIG.
In, the press-fitting margin α in the tooth thickness direction was secured.

By thus securing the press-fitting margin α at both ends 3a, 3b, both splines 3, 4 are supported at both ends, so that the male member 1 and the female member 2 are prevented from rattling or tilting in the rotational direction. Stable binding so that it does not occur. Further, since the press-fitting portions are limited to the both ends 3a, 3b, the press-fitting load is reduced as compared with the case where the press-fitting margin is secured over the entire length in the tooth trace direction.

Further, in this embodiment, the tooth thickness t of the end portion 3a of the outer spline 3 with respect to the inner spline 4 on the tip side in the press-fitting direction is t.
₁ is made smaller than the tooth thickness t ₂ of the end portion 3b on the tail end side so that the initial press-fitting load can be reduced.

It is possible to increase the tooth thickness at both ends of the inner spline 4 in the tooth trace direction, but since the inner spline 4 is generally formed by broaching, the tooth thickness changes along the tooth trace direction. It is difficult to get it done. On the other hand, since the outer spline 3 is formed by rolling, the tooth portion 10 of a rolling tool such as a die or a rack is, as shown in FIG. The outer spline 3 of the above-described embodiment can be easily machined by laminating and forming the intermediate tooth plate 10c having a large tooth thickness. Further, as the rolling tool, as shown in FIG. 6, it is possible to form the outer spline 3 as shown in FIG. 5 by using a tool in which both end portions of the tooth portion 10 in the tooth trace direction are ground by the grindstone 11. .

[0011]

As is apparent from the above description, according to the present invention, the male member and the female member can be stably connected so as to prevent rattling and tilting in the rotational direction, and the press-fitting load is reduced. This has the effect of improving the assemblability of both members.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of the outer spline.

3A is a sectional view taken along the line AA of FIG. 2, and FIG. 3B is a sectional view taken along the line BB of FIG.

FIG. 4 is a perspective view showing a tooth portion of a rolling tool for processing the outer spline of FIG.

FIG. 5 is a perspective view of another embodiment of the outer spline.

6 is a perspective view showing a tooth portion of a rolling tool for processing the outer spline of FIG.

[Explanation of symbols]

1 Male member 2 Female member 3 Outer spline 4 Inner spline 3a, 3b Both ends α Press-fitting margin

Claims (1)

[Claims] 1. A spline connecting structure for connecting a male member and a female member by press-fitting an outer spline of a male member into an inner spline of a female member, and a tooth trace of at least one spline of the outer spline and the inner spline. A spline coupling structure, characterized in that the tooth thickness at both ends in the direction is increased and a press-fitting margin in the tooth thickness direction is secured at the both ends.