JPH0544735A - Synchronizer ring for synchro-mesh and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a synchronizer ring improving productivity and reducing manufacturing cost. CONSTITUTION:In the synchronizer ring 21 of a synchro-mesh of which a friction clutch face actually constituting conical face is formed on the inner circumference, projecting parts 23 are formed between adjoining recessed parts 22 by means of a plurality of recessed parts provided side by side in the circumferential direction, the recessed parts 22 are formed in parallel with the rotating axis of the synchronizer ring 21, meanwhile a conical face is actually constituted of the inner circumferential faces 25 of a plurality of projecting parts 23 into a friction clutch face. The plurality of recessed parts are formed by broaching on the conical face, after machining the full circumference of the inner face into a conical face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizer ring for a synchronizing device in a manual transmission and a method for manufacturing the same.

[0002]

2. Description of the Related Art A manual transmission synchronizing device equalizes the rotational speeds of the coupling splines on the synchronizing side and the synchronized side by frictional force during a gear shift to achieve a smooth coupling.

In the Borg-Warner type synchronizer,
A synchronizer ring with a conical friction clutch surface formed on the inner circumference of the ring is used.The friction torque generated by the friction clutch surface slidingly pressing the friction surface of the synchronized gear during synchronous operation. Synchronization is done by.

FIG. 4 is a front view of a conventional synchronizer ring, FIG. 5 is a sectional view taken along line VV of FIG. 4, and FIG. 6 is an enlarged sectional view of a main part thereof. As shown in these drawings, a spiral groove 13 is provided on the friction clutch surface 12 on the inner periphery of the conventional synchronizer ring 11 in order to regulate the sliding contact area with the synchronized gear. A sprayed metal 14 such as molybdenum is sprayed on the surface of the groove 13.

In manufacturing the friction clutch surface 12 of the conventional synchronizer ring 11, first, a spiral groove 13 is formed on the inner peripheral surface by lathing, and after carburizing and quenching, metal spraying of molybdenum or the like is performed. And finally, in order to correct the spiral groove 13, the surface of the sprayed metal 14 is finished by lathing very thinly.

[0006]

In the conventional manufacturing process of the synchronizer ring 11, the lathe machining of the spiral groove 13 requires a relatively long machining time, and further the lathe machining for finishing is required after the thermal spraying. Therefore, the synchronizer ring is required. 11
However, there is a problem in that the productivity is low and the manufacturing cost is high.

The present invention solves this problem, and provides a synchronizer ring which has the same frictional force as the conventional spiral groove, but which improves productivity and reduces the manufacturing cost. It is an object.

[0008]

The structure of a synchronizer ring according to the present invention which achieves the above-mentioned object is a synchronizer ring of a synchronizer in which a friction clutch surface which substantially forms a conical surface is formed on the inner circumference. A convex portion is formed between adjacent concave portions by a plurality of concave portions arranged in the circumferential direction, and the concave portion is formed parallel to the rotation axis of the synchronizer ring, while at the inner peripheral surface of the plural convex portions. It is characterized in that substantially one conical surface is formed and used as a friction clutch surface.

Further, the structure of the method for manufacturing a synchronizer ring according to the present invention which achieves the above-mentioned object is a method for manufacturing a synchronizer ring of a synchronizing device in which a friction clutch surface which substantially forms a conical surface is formed on the inner circumference. In the above, the method has a step of machining an inner circumference into a conical surface over the entire circumference, and a step of broaching a plurality of recesses in the conical surface in a circumferential direction along a direction parallel to the rotation axis of the synchronizer ring. And

[0010]

In this synchronizer ring, the inner peripheral surfaces of the plurality of protrusions cooperate to function as a friction clutch surface, and the recesses do not contact the friction surface of the synchronized gear. The frictional force of the friction clutch surface is regulated by appropriately determining the ratio of the areas of the convex portion and the concave portion. Since the recess is parallel to the direction of the rotating shaft of the synchronizer ring, it can be processed by broaching along that direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a front view of a synchronizer ring according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG.

As shown in FIGS. 1 to 3, a plurality of recesses 22 are provided on the inner circumference of the synchronizer ring 21 according to the present invention so as to be aligned in the circumferential direction, and these recesses 22 are provided between adjacent recesses 22. A convex portion 23 is formed on the bottom.
That is, the inner periphery of the synchronizer ring 21 is an uneven surface in which the concave portions 22 and the convex portions 23 are alternately formed along the circumferential direction, and in the present embodiment, the concave portions 22 and the convex portions 23 are respectively formed. There are 12 each.

These recesses 22 are formed parallel to the rotation axis of the synchronizer ring 21, and these recesses 2
The bottom surface (inner peripheral surface) 24 of 2 respectively constitutes a part of one cylindrical surface whose central axis is the rotation axis of the synchronizer ring 21.

On the other hand, the inner peripheral surfaces 25 of the plurality of convex portions 23 are tapered, and the inner peripheral surfaces 25 substantially form one conical surface. Thus, this conical surface functions as the friction clutch surface of the synchronizer ring 21. Therefore, when this synchronizer ring 21 is used in a synchronizing device (not shown), the inner peripheral surface 25 of the convex portion 23 presses while slidingly contacting the friction surface of the mating synchronous gear during synchronizing operation, while the concave portion The inner peripheral surface 24 of 22 does not contact the friction surface of the counterpart synchronous gear. Here, the recess 22
By appropriately selecting the area ratio of the inner peripheral surfaces 24, 25 of the convex portions 23, the frictional force on the friction clutch surface can be optimized.

The other structure is the same as that of the conventional synchronizer ring.

Such a synchronizer ring 21 is manufactured as follows. That is, in processing the inner peripheral surface, first, the inner peripheral surface of the synchronizer ring 21 is machined so as to be a conical surface of the friction clutch surface over the entire circumference. Then, the inner peripheral surface is carburized and quenched, and a sprayed metal such as molybdenum is sprayed extremely thinly. Finally, the recess 22 is broached along a direction parallel to the rotation axis of the synchronizer ring 21.

[0018]

As described above, according to the present invention, a plurality of recesses arranged in the circumferential direction form a projection between adjacent recesses, and the recess is parallel to the rotating shaft of the synchronizer ring. On the other hand, since the inner peripheral surfaces of the plurality of convex portions substantially form one conical surface and it is used as a friction clutch surface, the ratio of the area of these convex portions to the concave portions should be appropriately determined. The frictional force on the friction clutch surface can be regulated by the concave portion, and since the concave portion is parallel to the direction of the rotating shaft of the synchronizer ring, it can be machined by broaching along that direction. Broaching is highly productive,
Since the processing cost is low, the productivity of the synchronizer ring can be improved and the manufacturing cost thereof can be reduced according to the present invention.

[Brief description of drawings]

FIG. 1 is a front view of a synchronizer ring according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged III-III sectional view of FIG.

FIG. 4 is a front view of a conventional synchronizer ring.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an enlarged view of a main part of FIG.

[Explanation of symbols]

Reference numeral 21 is a synchronizer ring, 22 is a concave portion, 23 is a convex portion, 24 is an inner peripheral surface of the concave portion 23, and 25 is an inner peripheral surface of the convex portion 23.

Claims (2)

[Claims] 1. A synchronizer ring of a synchronizer in which a friction clutch surface that substantially forms a conical surface is formed on the inner circumference, and a plurality of circumferentially arranged concave portions are provided between adjacent concave portions. And the concave portion is formed in parallel with the rotation axis of the synchronizer ring, while the inner peripheral surfaces of the plurality of convex portions substantially form one conical surface, which is used as a friction clutch surface. Characterizing synchronizer synchronizer ring. 2. A method for manufacturing a synchronizer ring of a synchronizer having a friction clutch surface substantially forming a conical surface on an inner circumference thereof, wherein a step of machining the inner circumference into a conical surface over the entire circumference; A method of manufacturing a synchronizer ring for a synchronizing device, comprising a step of broaching a plurality of concave portions on a surface in a circumferential direction along a direction parallel to a rotation axis of the synchronizer ring.