JPH0679835B2 - Synchronizer ring manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a synchronizer ring,
More specifically, the present invention relates to an improvement in a method of manufacturing a synchronizer ring used for synchronous meshing of a synchronous meshing gear transmission used in a vehicle such as an automobile and having a friction material on a synchronous friction surface.

(Prior Art) In a synchromesh gear transmission, a synchronizer ring is arranged between a shaft and a gear to frictionally engage an inner or outer conical surface thereof with a corresponding conical surface of the shaft or the gear.
Methods for achieving gear synchronization are known. Such a synchronizer ring has a friction surface having a sufficient coefficient of friction and wear resistance on the conical surface for frictional engagement.

This friction surface is constituted by adhering a friction material to the conical surface of the synchronizer ring, and the friction material is usually made of a material such as cotton, metal, cellulose or synthetic fiber, and is rough and porous. A paper liner formed by impregnating a paper base material with a thermosetting resin is used.

An oil groove for discharging oil is formed on the friction surface so that the oil absorbed by the friction surface can easily escape during the gear shift operation of the gear transmission. The oil groove extends in the axial direction and the circumferential direction. Conventionally, formation of this oil groove was performed as follows.

First, a friction material such as a paper liner formed to have the same shape as the conical surface of the synchronizer ring is bonded to the conical surface of the synchronizer ring. An axial oil groove is provided by a predetermined method during or after bonding. Furthermore,
After bonding, an oil groove is provided in the circumferential direction by machining such as a lathe to complete the synchronizer ring with friction material.

(Problems to be Solved by the Invention) However, in the above-described conventional manufacturing method, since the oil grooves in the circumferential direction are formed after the friction material is bonded to the synchronizer ring, machining in the circumferential direction is performed by machining. Since the oil groove must be formed, the number of steps is large, and there are problems that "burrs" and "burrs" are easily generated in the friction material during machining. When "burrs" or "burrs" occur in the friction material, the swirl on the corresponding conical surface of the shaft or gear deteriorates, causing a problem that the function of the synchronizer ring deteriorates, and it also adversely affects the friction performance of the friction surface. Can also be considered.

Therefore, an object of the present invention is to provide a method of manufacturing a synchronizer ring which can solve the above-mentioned problems, has a small number of steps, and is free from "burr" and "burr" of friction material by machining.

(Means for Solving Problems) In order to achieve the above-mentioned object, the synchronizer of the present invention
A method for manufacturing a ring includes a synchronizer ring having a friction material in which a gear in a gear transmission is synchronously engaged by friction of a conical surface, and an oil groove in a circumferential direction is formed on the conical surface. A method for producing the friction material, which comprises: a stamping step of punching the base material from the original plate; a molding step of molding the friction material into a shape conforming to the conical surface; and a step of adhering the friction material to the conical surface. It is characterized by including an oil groove forming step of forming an oil groove in the circumferential direction on the friction material before or at the time of the adhering step.

(Operation) In the method for manufacturing a synchronizer ring of the present invention, since the friction material is provided with the circumferential groove before or at the time of adhering the friction material to the conical surface of the synchronizer ring,
There is no need to machine circumferential grooves after bonding.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same parts are designated by the same reference numerals.

(A), (b), (c) and (d) of FIG. 1 are views showing a first embodiment of a method for manufacturing a synchronizer ring according to the present invention. The synchronizer ring 10 is manufactured as follows.

First, a core ring 1 shown in FIG. 1 (a) having a substantially cylindrical outer periphery and a flange portion having a plurality of teeth 2 at one axial end thereof is prepared. The inner peripheral surface of this core ring 1 is a tapered conical surface 4, and the conical surface 4
A friction material, that is, a paper liner 5 is adhered to this. It goes without saying that a material other than paper liner can be used as the friction material.

In the first embodiment, the steps of manufacturing, punching, molding and adhering the paper liner 5 to the core ring 1 are sequentially performed, and if necessary, a step of cutting off the protruding portion of the paper liner 5 is added. The step of forming the oil groove in the circumferential direction on the paper liner 5 is performed between punching and molding, but it is preferable to perform it simultaneously with punching.

The manufacturing process of the paper liner 5 is known, and is manufactured as follows. It is continuously drawn from a roll-shaped long base material (not shown) made of the above-mentioned synthetic fiber or the like. The drawn base material is cut into a sheet, immersed in a stock solution of thermosetting resin such as phenol resin, air-dried and then thermoset, and a lining with a friction coefficient of 0.10 or more (not shown).
Becomes An adhesive is applied to the lining by a known method to form a master plate (not shown) of the paper liner 5.

The paper liner 5 has a conical surface 4 as shown in FIG.
Manufactured by stamping, that is, punching, into a predetermined size from the original plate in accordance with the developed shape, that is, the bow shape. At the time of this punching, 2 for oil discharge extending in the circumferential direction simultaneously with the punching
The oil groove 5a of the row is punched by the punching work (also the first
See FIG. (B)). If necessary, two or more rows of oil grooves 5a in the circumferential direction can be provided. At this time, in order to prevent the paper liner 5 from being separated by punching, each oil groove 5a is provided with column portions 5b at equal intervals. Further, the oil groove 5a may be formed as a continuous groove stamped by a crushing operation, in which case the column portion 5b is not necessary.

After punching, the arched paper liner 5 is automatically curled by a molding machine and molded into a shape as shown in FIG. 1 (c).

The molded paper liner 5 is bonded to the conical surface 4 of the core ring 1 by a known hot pressing method. In this hot pressing method, the coring 1 is placed in the mold of a pressing device (not shown).
Is placed with the bottom of the frustoconical shape facing upwards, and the paper liner 5
Is placed on the conical surface 4 of the core ring 1 and press-molded at a predetermined temperature and pressure. At this time, it is necessary to form an axial oil groove 6 in the conical surface 4 that communicates with the circumferential oil groove 5a that has already been provided. This oil groove 6 can be formed simultaneously with press molding or after press molding. It is provided by a predetermined method.

After the press molding, the paper liner 5 protruding from both edges of the core ring 1 in the axial direction is trimmed and cut off, and the manufacture of the synchronizer ring 10 shown in FIG. 1D is completed. After press molding, the circumferential oil groove 5a becomes an annular oil groove.

Next, a second embodiment of the present invention will be described based on (a), (b), (c) and (d) of FIG. The shape of the core ring 1 used in the second embodiment is almost the same as that of the first embodiment. As the friction material, the paper liner similar to that of the first embodiment is used.

First, as in the first embodiment, the steps of manufacturing the paper liner 7, molding the paper liner 7 by curling, and adhering the paper liner 7 to the conical surface 4 of the core ring 1 are as follows.
It is almost the same as the embodiment.

However, in the second embodiment, the paper liner 7
Is different from the step of punching from the original plate (not shown) and the step of adhering it to the conical surface 4. As can be seen from FIG. 2 (b), the paper liner 7 is punched from the original plate as two long arcuate pieces. Next, the two paper liners 7 are curling-molded as shown in FIG. 2 (c), respectively, and then,
It adheres to the conical surface 4 of the core ring 1 (FIG. 2 (d)).

The bonding step is performed such that the two paper liners 7 are axially spaced by a predetermined distance, as can be seen from FIG. 2 (d). Therefore, after the bonding is completed, the synchronizer ring 20 provided with the circumferentially extending oil groove 9 is completed. This interval can be set arbitrarily. If it is desired to increase the number of oil grooves 9 in the circumferential direction, it is possible to increase the number of paper liners 7 to be bonded. Second
Also in the embodiment, the axial oil groove 8 is formed during or after the bonding.

In the above-described first and second embodiments, the case where the friction surface of the core ring 1, that is, the conical surface 4 is on the inner circumference of the core ring 1 has been described, but the conical surface 4 is on the outer circumference of the core ring 1. It goes without saying that the manufacturing method of the present invention can be applied even in some cases. In addition, each step does not necessarily have to be performed continuously, and may be performed in a batch manner for each step.

(Effects of the Invention) According to the method for manufacturing the synchronizer ring of the present invention described above, the following effects can be obtained.

Since it is not necessary to provide a circumferential oil groove after the friction material is bonded to the conical surface of the synchronizer ring, the process is
Decrease.

Since no oil groove in the circumferential direction is formed by machining after bonding, "burrs" and "burrs" caused by machining do not occur. Therefore, the function of the synchronizer ring is improved because the swirl of the shaft or gear that engages with the conical surface of the synchronizer ring against the corresponding conical surface is not adversely affected.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a method for manufacturing a synchronizer ring according to the present invention, and FIG. 2 is a diagram showing a second embodiment of a method for manufacturing a synchronizer ring according to the present invention. is there. [Explanation of symbols for main parts] 1 …… Coring 4 …… Conical surface 5, 7 …… Paper liner 5a, 9 …… Circumferential oil groove 6, 8 …… Axial oil groove 10, 20 …… Synchronizer ring

Claims (4)

[Claims] 1. A synchronizer ring having a friction material in which a gear for a gear transmission is synchronously engaged by friction of a conical surface, and an oil groove in a circumferential direction is formed on the conical surface. A punching step of punching from an original plate, a forming step of forming the friction material into a shape conforming to the conical surface, and a step of adhering the friction material to the conical surface, the method comprising: Alternatively, the method of manufacturing a synchronizer ring, comprising an oil groove forming step of forming an oil groove in a circumferential direction on the friction material at the time of the adhering step. 2. The synchronizer according to claim 1, wherein the oil groove forming step is performed before the adhering step and between the punching step and the forming step. Ring manufacturing method. 3. The oil groove forming step comprises providing two or more of the friction materials at a predetermined axial distance from each other during the adhering step. The method for manufacturing a synchronizer ring according to [4]. 4. The synchronizer according to claim 2, wherein the friction material is a paper liner in which a paper base material is impregnated with a thermosetting resin. Ring manufacturing method.