JP3005925B2 - Spline connection structure - Google Patents

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 a case where a gear is fixed to a shaft of a transmission of an automobile, and more particularly, to an external spline formed on a male member such as a shaft. And a spline coupling structure that press-fits an inner spline formed on the female member to couple the two members together.

[0002]

2. Description of the Related Art Conventionally, when an outer spline of a male member is press-fitted to an inner spline of a female member, it is necessary to use a conventional method.
As disclosed in Japanese Patent Application Publication No. 7621, it is general that the tip diameter of the outer spline is made larger than the tooth root diameter of the inner spline to secure a press-fit allowance in the tooth height direction of both splines.

[0003]

As described above, simply securing the press-fit allowance in the tooth height direction leaves a clearance 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. Causes backlash in the rotation direction.
In this case, it is conceivable to secure the press-fitting allowance in the tooth thickness direction by increasing the tooth thickness of the outer spline, but in this case, the press-fitting load increases and the fitting becomes difficult. SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a spline coupling structure capable of securing a press-fit allowance in a tooth thickness direction to prevent a play in a rotational direction and reduce a press-fit load.

[0004]

In order to achieve the above object,
The present invention relates to a spline coupling structure in which an outer spline of a male member is press-fitted to an inner spline of a female member to couple the male member and the female member, wherein the tooth side surface of one of the outer spline and the inner spline is involute. thereby forming a curved surface, the tooth side of the other splines, characterized in that the tooth thickness direction of the press-fitting margin is formed in the arcuate surface of so that is ensured in the tooth depth direction end portions with respect to the tooth sides of one of the spline .

[0005]

[ Function ] Since the press-fit allowance is secured at both ends in the tooth length direction,
The play in the rotation direction is prevented without increasing the margin to the left.
You. Thus, the press-fit load is reduced and the rotation direction
Data can be reliably prevented.

[0006]

Referring to FIG. 1, reference numeral 1 denotes a male member such as a shaft, and 2 denotes a female member such as a gear. An outer spline 3 formed on the outer peripheral surface of the male member 1 is attached to the inner peripheral surface of the female member 2. The male member 1 and the female member 2 were supplied by press-fitting to the formed inner spline 4.

[0007] Then, as shown in FIG.
While forming the tooth side surface 3a as an involute curved surface,
The tooth side surface 4a of the inner spline 4 is formed into an arc surface, and the tooth height
Pressing allowance α in the tooth thickness direction is secured at both ends in the direction. this
According to the inner spline 4, the outer spline 3 is
Will be supported by the press-fit sections at both ends in the direction.
Even if α is small, there is no backlash in the rotation direction and the press-fit load is low.
Is reduced.

[0008]

【The invention's effect】 As is apparent from the above description, the present invention
According to this, rattling occurs in the rotation direction between the male member and the female member.
As well as reducing the press-fit load to assemble both members.
This has the effect of improving the adhesiveness.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of the main part.

[Explanation of symbols]

1 Male Member 2 Female Member 3 Outer Spline 4 Inner Spline 3a, 4a Tooth Side α Pressing Allowance

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-69715 (JP, U) JP-A 3-80123 (JP, U) JP-B 62-42738 (JP, B2)

Claims (1)

(57) [Claims] In a spline coupling structure in which a male member and a female member are joined by press-fitting an outer spline of a male member to an inner spline of a female member, a tooth side surface of one of the outer spline and the inner spline is formed. and forming an involute curved surface, the tooth side of the other splines, and wherein the tooth thickness direction of the press-fitting margin is formed in the arcuate surface of so that is ensured in the tooth depth direction end portions with respect to the tooth sides of one of the spline Spline coupling structure.