JPH09176817A - Production of synchronizer ring for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing a synchronizer ring for a transmission contributing to an improvement in productivity without impairing the oil cutting property of an inner peripheral tapered surface. SOLUTION: The inner peripheral tapered surface 2 of the synchronizer ring 1 is coated with a masking material 6 formed with many coating parts 5 in parallel at prescribed intervals along the axial direction of the synchronizer ring 1 and the wear resistant material is thermally sprayed on the inner peripheral tapered surface 2, by which oil cutting grooves are automatically formed between the films consisting of the wear resistant material when the masking tape 6 is removed after the thermal spraying.

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 synchronizer ring for a transmission, and more particularly to a manufacturing method effective for improving the productivity of the synchronizer ring.

[0002]

2. Description of the Related Art A conventional synchronizer ring for a transmission has a synchronizer ring A as shown in FIG.
By forming the thread groove B and the groove along the axial direction on the inner peripheral tapered surface by machining, the oil drainage property of the tapered surface was secured. Further, since such a machining process is carried out also when a wear resistant material typified by molybdenum is sprayed on the tapered surface, there is a problem that the productivity of the synchronizer ring is low.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a method for manufacturing a synchronizer ring for a transmission, which can improve productivity without impairing the oil draining property of the inner peripheral tapered surface. The challenge is to provide.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to an inner peripheral taper surface of a synchronizer ring with a masking material in which a plurality of coating portions along the axial direction of the synchronizer ring are arranged in parallel at predetermined intervals. And a wear resistant material is sprayed on the inner peripheral tapered surface.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a synchronizer ring manufactured by the manufacturing method according to the present invention, and FIG. 2 is a vertical sectional view of FIG.

In these figures, a coating 3 made of a wear-resistant material is formed on the inner peripheral tapered surface 2 of the synchronizer ring 1 at predetermined intervals so that the thickness of the coating 3 can be reduced between adjacent coatings 3. The oil-draining groove 4 having a corresponding depth is formed to secure the wear resistance and the oil-draining property of the inner peripheral tapered surface 2.

The synchronizer ring 1 having such a configuration
When producing the, as shown in FIG. 3, the inner peripheral tapered surface 2 of the synchronizer ring 1 is covered with a masking material 6 in which a plurality of coating portions 5 along the axial direction of the synchronizer ring 1 are arranged in parallel at a predetermined interval. The inner peripheral taper surface 2 is coated and sprayed with a wear resistant material. Then, the coating 3 made of the wear-resistant material is formed only on the portion corresponding to the window portion 7 formed by the adjacent coating portion 5, and the coating 3 made of the wear-resistant material is not formed on the portion covered by the coating 5.

Therefore, since the oil-draining groove 4 is formed by removing the masking material 6, the groove along the axial direction is formed in the inner peripheral surface 2 of the synchronizer ring 1 before the thermal spraying as in the conventional case.
Since it is not necessary to perform machining by machining, the number of machining steps is reduced and productivity is increased. When the material to be sprayed is molybdenum, for example, the masking material 6 can be made of resin, bakelite, paper or the like, but it is desirable to appropriately select the material of the masking material 6 depending on the spray material.

Further, the covering portion 5 of the masking material 6 does not necessarily have to be parallel to the axial direction of the synchronizer ring 1, but by providing an appropriate angle between them,
It is also possible to smoothly introduce the lubricating oil into the inner peripheral tapered surface 2 of the synchronizer ring 1 and improve the oil removing property.

[0010]

As is apparent from the above description, according to the present invention, the inner peripheral tapered surface of the synchronizer ring is formed by a masking material in which a large number of coating portions along the axial direction of the synchronizer ring are arranged in parallel at a predetermined interval. Since the wear-resistant material is sprayed on the inner peripheral tapered surface by coating, if the masking material is removed after the spraying, the oil-draining groove is automatically formed between the coatings of the wear-resistant material. . Therefore, it is not necessary to machine the grooves along the axial direction to secure the oil drainage before the thermal spraying, and the productivity of the synchronizer ring can be improved without impairing the oil drainage of the inner peripheral tapered surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a synchronizer ring manufactured by a manufacturing method according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a developed front view of an inner peripheral tapered surface showing a manufacturing process.

FIG. 4 is a vertical sectional view showing a conventional example of a synchronizer ring.

[Explanation of symbols]

 1 Synchronizer ring 2 Inner taper surface 3 Coating made of wear resistant material 4 Oil drain groove 5 Cover part 6 Masking material 7 Window part

Claims (1)

[Claims] 1. An inner peripheral tapered surface of a synchronizer ring is covered with a masking material in which a plurality of coating portions along the axial direction of the synchronizer ring are arranged in parallel at a predetermined interval, and a wear resistant material is applied to the inner peripheral tapered surface. A method for manufacturing a synchronizer ring for a transmission, which comprises spraying.