JP2001153147A - Inner spline structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner spline structure hardly causing bending in a snap ring. SOLUTION: This inner spline structure for forming an inner spline 3 on an inside surface 2 is constituted so that a first spline shape of an end surface part 4 is formed in a diameter larger than a second spline shape of the inside 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner spline structure having a spline formed on an inner surface.

[0002]

2. Description of the Related Art As a prior art relating to an inner spline structure in which splines are formed on the inner surface, Japanese Unexamined Utility Model Publication No.
No. 7 is known. According to FIGS. 6 and 7,
A conventional technique relating to an inner spline structure having a spline formed on an inner surface will be described. FIG. 6 is a perspective view of a conventional spline structure, and FIG. 7 is a partial cross-sectional view of a configuration in which the conventional internal spline structure is applied to a synchronous device of a gear transmission.

As shown in FIG. 6, in the prior art, the inner surface 22 of the clutch hub 1 is provided with a spline shape in the inner portion 5 in the axial direction, and the end surface portion 24 in the axial direction is provided with a curved surface shape. I have. The curved shape of the end face portion 24 has the same diameter as the spline-shaped tooth bottom of the inside 5.

Referring to FIG. 7, a description will be given of a configuration in which a conventional internal spline structure is applied to a synchronous device of a gear transmission. The inner spline 3 of the inside 5 of the clutch hub 1 is
And spline fit. The curved shape of the end surface portion 24 of the inner spline 3 is the spline-shaped root 10 of the inner spline 3.
Has the same diameter as.

[0005] The surface 16 of the end face portion 24 is quenched. A snap ring 17 is inserted between the surface 16 of the end face portion 24 and the concave portion 20 provided on the shaft 19. The gear 18 is arranged on the other part of the surface 16 of the end face part 24.

[0006]

In the case of the conventional internal spline structure, when the shaft 19 receives a load upward in the drawing, the concave portion 20 provided in the shaft 19 and the end surface portion 2 are provided.
The snap ring 1 inserted between the surface 16 and the surface 16
7 receives a load upward in the figure. However, as shown in FIG. 7, the snap ring 17 abuts only on the bearing surface having a small area between the snap ring 17 and the surface 16 of the end face portion 24.
The snap ring 17 is bent upward in the figure. When the snap ring 17 is bent, a relative displacement occurs between the shaft 19 and the clutch hub 1, causing a problem that the position setting changes.

The present invention has been made in order to solve the above problems.
It is an object of the present invention to provide an inner spline structure that can secure an appropriate seating surface between the inner ring and a snap ring.

[0008]

According to a first aspect of the present invention, there is provided an inner spline structure having a spline formed on an inner surface, wherein a first spline shape at an end face portion is an inner second spline. An inner spline structure characterized by being formed with a larger diameter than the shape.

In order to achieve the above-mentioned object, the invention according to claim 2 is characterized in that a radius of curvature of a corner of the first spline-shaped tooth bottom of the end face part is equal to a radius of curvature of the second spline-shaped tooth root inside the inside. The inner spline structure is characterized by being set to be larger than the radius of curvature of the corner.

[0010]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an inner spline structure according to one embodiment of the present invention. As shown in FIG. 1, of the inner surface 2 of the inner spline 3 of the clutch hub 1, a first spline shape is formed on an end surface portion 4 which is an axial end portion,
A second spline shape is formed in the interior 5 in the axial direction. The first spline shape has a larger diameter than the second spline shape.

The first spline shape may be formed on both end faces in the axial direction, or may be formed on one end face 4 as shown in FIG. A portion of the inner surface 2 of the inner spline 3 where the first spline shape and the second spline shape are not formed is formed with a curved surface having the same diameter as the tooth bottom of the second spline shape, so that lubrication in the axial direction can be smoothly performed. I try to make it.

Referring to FIG. 2, the cross-sectional shape along the line AA in FIG. 1 will be described. FIG. 2 is a sectional view taken along line AA of FIG. The side surface 16 of the inner spline 3 is quenched. A first spline shape is formed on the end surface portion 4 of the inner surface 2 of the inner spline 3 near the side surface 16. The first spline shape has a tooth bottom 6, an inclined tooth surface 7, and a tooth tip 8.
A second spline shape is formed in the interior 5 in the axial direction. The second spline shape has a tooth bottom 10, an inclined tooth surface 11, and a tooth tip 12. The first spline shape is formed corresponding to the second spline shape, and has a larger diameter than the second spline shape. That is, the first spline-shaped tooth bottom 6, the inclined tooth surface 7, and the tooth tip 8 are respectively the second spline-shaped tooth bottom 10, the inclined tooth surface 11, and the tooth tip 1.
2, and has a larger diameter than the second spline-shaped tooth bottom 10, inclined tooth surface 11, and tooth tip 12. In other words, the first spline-shaped tooth bottom 6, the inclined tooth surface 7, and the tooth tip 8 are arranged outside the second spline-shaped tooth bottom 10, the inclined tooth surface 11, and the tooth tip 12, respectively.

The first spline shape of the end face portion 4 is
To what depth should be formed in the axial direction from
It is mainly determined by the following two factors. One is side 1
The object of the present invention is to make it possible to eliminate an adverse effect on the contraction after quenching of No. 6 with the external spline (not shown). The other is to prevent the occurrence of cracks due to stress concentration originating at the intersection of the side surface 16 and the connection point between the second spline-shaped tooth bottom 10 and the inclined tooth surface 11. It is to be.

From these two elements, in the embodiment of the present invention, the first spline shape of the end face portion 4 is formed from the side face 16 to a depth of 1 to 5 mm in the axial direction.

The range indicated by B in FIG. 1 will be described with reference to FIG. FIG. 3 is an enlarged view of a range indicated by B in FIG. As shown in FIG. 3, the first spline-shaped root 6, the inclined tooth flank 7, and the tooth tip 8 are each a second spline-shaped root 1.
0, the inclined tooth surface 11, the tooth tip 12, and the diameter of the second spline is larger than the tooth bottom 10, the inclined tooth surface 11, and the tooth tip 12.

The radius of curvature of the corner 13 of the first spline-shaped tooth bottom 6 of the end face 4 is set to be larger than the radius of curvature of the corner 14 of the second spline-shaped tooth bottom 10 of the interior 5. Accordingly, it is possible to prevent the occurrence of cracks due to stress concentration at the intersection of the corner portion 14 and the side surface 16 which are the connection points between the tooth bottom 10 and the inclined tooth surface 11 of the second spline shape. Is to be able to

The first spline-shaped tooth bottom 6 and the second spline-shaped tooth bottom 10 are formed to have a dimensional difference Δd2. The inclined tooth surface 7 having the first spline shape and the inclined tooth surface 11 having the second spline shape are formed so as to have a dimensional difference Δd3. By appropriately setting the dimensional difference Δd2 and the dimensional difference Δd3, the radius of curvature of the corner 13 of the first spline-shaped tooth bottom 6 of the end face 4 is changed to the corner of the second spline-shaped tooth bottom 10 of the inside 5. 14 can be set to be larger than the radius of curvature. First spline-shaped root 6
By setting the radius of curvature of the corner 13 larger, stress concentration can be reduced and cracks can be prevented.

The first spline-shaped tooth tip 8 and the second spline-shaped tooth tip 12 are formed to have a dimensional difference Δd1. The operation and effect of this configuration will be described with reference to FIGS. FIG. 4 is a partial cross-sectional view of a configuration in which the internal spline structure according to one embodiment of the present invention is applied to a synchronization device of a gear transmission.

As shown in FIG. 4, the clutch hub 1 is applied to a synchronizing device of a gear transmission, a gear 18 is brought into contact with a side surface 16, and an inner spline 3 is formed inside 5 of the inner surface 2. . The clutch hub 1 and the shaft 19 are spline-fitted between the inner spline 3 and the outer spline of the shaft 19. That is, on the left side of the figure, the tooth bottom 10 and the shaft 19 of the second spline shape of the inner spline 3 are shown.
Are spline-fitted between the outer spline teeth of the inner spline 3 and the second spline-shaped tooth tip 12 of the inner spline 3 and the outer spline tooth bottom of the shaft 19 on the right side in the figure. ing.

As described with reference to FIG. 3, the first spline shape formed on the end face portion 4 is formed corresponding to the second spline shape, and has a larger diameter than the second spline. That is, as shown in FIG. 4, the first spline-shaped tooth bottom 6 is formed to be larger in diameter than the second spline-shaped tooth bottom 10, and the first spline-shaped tooth tip 8 is formed in the second spline-shaped tooth tip. The diameter is larger than 12.

A recess 20 is formed in the circumferential direction of the shaft 19, and a snap ring 17 is inserted between the surface 16 of the clutch hub 1 and the recess 20. Contact area between the snap ring 17 and the surface 16 of the clutch hub 1;
That is, the area of the bearing surface of the snap ring 17 is set to be small on the left side in FIG. This will be described with reference to FIG. FIG. 5 is a diagram for illustrating an effect of a configuration in which the internal spline structure according to the embodiment of the present invention is applied to a synchronization device used in a gear transmission.

As shown in FIG. 5, in the case of the prior art, the portion for securing the seating surface by the snap ring 17 can secure only a small area radially outward from the tooth bottom 6 of the end surface portion 4.
In the case of the embodiment of the present invention, it is possible to secure the illustrated additional seat surface portion in addition to the conventional seat surface securing portion, so that a larger seat surface area can be secured. The dimensional difference Δd 1 between the first spline-shaped tooth tip 8 and the second spline-shaped tooth tip 12 is set in accordance with the required area of the seating surface of the snap ring 17. The smaller the dimensional difference Δd1, the larger the area of the bearing surface of the snap ring 17 can be secured.

In FIG. 4, since a large area of the seat surface of the snap ring 17 can be ensured, the shaft 19
Even if is loaded upward in the figure, the snap ring 17
Bending upward in the figure hardly occurs. If the snap ring 17 does not easily bend, relative displacement between the shaft 19 and the clutch hub 1 does not easily occur, and the position setting does not easily change.

[0024]

According to the first aspect of the present invention, in an inner spline structure having a spline formed on an inner surface, a first spline shape at an end face is formed to have a larger diameter than an inner second spline shape. Because of the inner spline structure, a large area of the seat surface of the snap ring can be secured, and an excellent effect that bending of the snap ring hardly occurs is achieved.

According to a second aspect of the present invention, in the first aspect, the first surface of the end face portion is provided.
The inner spline structure is characterized in that the radius of curvature of the corner of the spline-shaped tooth bottom is set larger than the radius of curvature of the corner of the second spline-shaped tooth root inside the first spline shape. It is possible to reduce the stress concentration on the corners of the spline-shaped tooth bottom, and to achieve an excellent effect that cracks can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of an inner spline structure according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an enlarged view of a range indicated by B in FIG. 1;

FIG. 4 is a partial cross-sectional view of a configuration in which the internal spline structure according to the embodiment of the present invention is applied to a synchronization device of a gear transmission.

FIG. 5 is a diagram showing an effect of a configuration in which the internal spline structure according to the embodiment of the present invention is applied to a synchronization device used in a gear transmission.

FIG. 6 is a perspective view of a conventional inner spline structure.

FIG. 7 is a partial cross-sectional view of a configuration in which a conventional internal spline structure is applied to a synchronization device of a gear transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Clutch hub 2 ... Inner surface 3 ... Inner spline 4 ... End face portion 5 ... Inner 6 ... Tooth bottom 7 ... Inclination tooth surface 8 ... Tooth tip 9 ... Curved surface 10 ... Tooth bottom 11 ... ... inclined tooth surface 12 ... tooth tip 13 ... corner 14 ... corner 15 ... curved surface 16 ... side surface 17 ... snap ring 18 ... gear 19 ... shaft 20 ... recess 22 ... inner surface 24 ... … End face

Claims (2)

[Claims] 1. An inner spline structure in which a spline is formed on an inner surface, wherein a first spline shape of an end face portion is formed to have a larger diameter than an inner second spline shape. 2. The method according to claim 1, wherein a radius of curvature of a corner of the bottom of the first spline shape on the end face is set to be larger than a radius of curvature of a corner of the bottom of the second spline shape inside. And inner spline structure.