JPS6394827A - Manufacture of synchronizer ring - Google Patents

Abstract

PURPOSE:To reduce the number of processes and at the same time prevent burrs and rough edges left on a friction material due to machining from generating by a method wherein circumferential grooves are provided on the friction material before or at the time of bonding of the friction material to the conical surface of a synchronizer ring. CONSTITUTION:The inner peripheral surface of the core ring 1 of a synchronizer ring 10 is made to be a tapered conical surface 4, onto which a friction material or a paper liner 5 is bonded. The process to form circumferential oil grooves on the paper liner 5 is done at a time between punching and forming, but the preferable process is to effect it simultaneously with the punching. The paper linear 5 is manufactured by punching an original sheet in a predetermined size of the developed shape of the conical surface 4 or an arc, and simultaneously with the punching of the arc, two rows of oil grooves 5a, which extend circumferentially and are for discharging oil, are also pierced by punching. Two or more rows of the oil grooves may be provided, when necessary. At this time, in order to prevent the paper liner 5 from separating due to punching, equispaced columnar parts 5b are made among respective oil grooves 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application 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 for manufacturing a synchronizer ring that is used for synchronization of a synchronization gear transmission used in vehicles such as automobiles and has a friction material on its synchronization friction surface.

(Prior Art) In a synchronous gear transmission, a synchronizer ring is arranged between a shaft and a gear, and the inner or outer conical surface of the synchronizer ring is frictionally engaged with the corresponding conical surface of the shaft or gear,
Methods are known that do not achieve gear synchronization. Such a synchronizer ring has a friction surface having a sufficient friction coefficient and wear resistance on a conical surface for frictional engagement.

The friction surface is constructed by bonding a friction material to the conical surface of the synchronizer ring, which is typically made of a coarse, porous material such as cotton, metal, cellulose or synthetic fibers. A paper liner is used, which is formed by impregnating a paper base material with a thermosetting resin.

An oil groove for draining oil is formed in the friction surface so that the oil absorbed by the friction surface can easily escape during a gear change operation of the gear transmission. This oil groove extends in the axial direction and the circumferential direction. Conventionally, this oil groove was formed 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 adhered 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, oil grooves are provided in the circumferential direction by machining using a lathe, etc., to complete the synchronizer ring with friction material.

(Problem to be Solved by the Invention) However, in the conventional manufacturing method described above, the circumferential oil grooves are formed after the friction material is bonded to the synchronizer ring, so the circumferential oil grooves are formed by machining. Oil grooves must be formed, which requires a large number of steps, and there is also the problem that ``burrs'' or burrs are likely to occur in the friction material during machining. When "burrs" or "burrs" occur in the friction material, the swath of the shaft or gear relative to the corresponding conical surface becomes poor, causing problems such as deterioration of the functions of synchronizers, iser rings, and the friction performance of the friction surface. It is also possible that it may have a negative impact on the

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a synchronizer ring that can solve the above-mentioned problems, requires fewer steps, and does not produce burrs or burrs on the friction material by machining.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the method for manufacturing a synchronizer ring of the present invention comprises: bringing gears for a gear transmission into synchronous meshing by the friction of conical surfaces; A synchronizer ring having a friction material with circumferential oil grooves formed on a conical surface is punched out from the original material, and a molding step is formed to form the friction material into a shape that fits the conical surface. and a step of adhering the friction material to the conical surface, the method comprising an oil groove forming step of forming a circumferential oil groove in the friction material before or during the adhesion step. It is characterized by comprising.

(Function) In the method for manufacturing a synchronizer ring of the present invention, circumferential grooves are provided in the friction material before or during bonding of the friction material to the conical surface of the synchronizer ring, so that circumferential grooves are formed in the friction material after bonding. It becomes unnecessary to provide it by machining.

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

(a) + (b), (c) and (d) in Figure 1 are
First method of manufacturing a synchronizer ring according to the present invention
It is a figure showing an example. Synchronizer ring 10 is manufactured as follows.

First, a core ring 1 shown in FIG. 1(a) is prepared, which has a substantially cylindrical outer periphery and includes a flange portion having a plurality of teeth 2 at one end in the axial direction.

This core ring 1 has a tapered conical surface 4 on its inner peripheral surface.
A friction material, that is, a paper liner 5 is bonded to the conical surface 4. It goes without saying that materials other than paper liners 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 performed in sequence, and if necessary, a step of cutting off the protruding portion of the paper liner 5 is added after adhering.

The step of forming circumferential oil grooves in the paper liner 5 is performed between punching and molding, but is preferably performed simultaneously with punching.

The manufacturing process of the paper liner 5 is well known and is manufactured as follows. It is continuously drawn out from a roll-shaped and elongated base material (not shown) made of the aforementioned synthetic fiber or the like. The drawn base material is cut into sheets, immersed in an undiluted solution of thermosetting resin such as phenolic resin, air-dried, and then heat-cured to form a lining (not shown) having a coefficient of friction of 0.10 or more. Become. The lining is coated with an adhesive by a known method and becomes the original plate (not shown) of the paper liner 5.

The paper liner 5 has a conical surface 4 as shown in FIG.
It is manufactured by punching out a predetermined size from an original plate according to the developed shape, that is, an arcuate shape. At the time of this punching, there are two
The rows of oil grooves 5a are punched out by a punching operation (see also FIG. 1(b)). If necessary, two or more rows of the circumferential oil grooves 5a 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 pillar portions 5b at equal intervals. Further, the oil groove 5a may be formed as a continuous groove embossed by a crushing operation, and in that case, the column portion 5b becomes unnecessary.

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

The paper liner 5 after molding is adhered to the conical surface 4 of the core ring 1 by a known hot press method. In this hot press method, a core ring 1 is placed in a mold of a press device (not shown).
with the truncated cone-shaped bottom facing upward, and place 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. Provided in a prescribed manner.

After press forming, the paper liner 5 protruding from both axial edges of the core ring 1 is trimmed and cut off, completing the manufacture of the synchronizer ring 10 shown in FIG. 1(d). After press forming, the circumferential oil groove 5a becomes an annular oil groove.

Next, (a), (b), (c) and (d) in Figure 2
A second embodiment of the present invention will be described based on the following. The shape of the core ring 1 used in the second embodiment is almost the same as that of the first embodiment. Further, a paper liner similar to that of the first embodiment is used as a friction material.

First, the paper liner 7 is manufactured in the same manner as in the first embodiment, the paper liner 7 is formed by curling, and the paper liner 7 is bonded to the conical surface 4 of the core ring 1.
This is almost the same as the example.

However, in the second embodiment, the paper liner 7
The step of punching out the material from an original plate (not shown) and the step of adhering it to the conical surface 4 are different. As can be seen in FIG. 2(b), the paper liner 7 is stamped from the original sheet as two long arcuate pieces. Next, these two paper liners 7 are attached to each other as shown in FIG.
) as shown in FIG. 2 (d), and then each is adhered to the conical surface 4 of the core ring 1 (FIG. 2(d)).

The bonding process is performed so that the two paper liners 7 are spaced apart from each other by a predetermined distance in the axial direction, as shown in FIG. 2(d). Therefore, after the bonding is completed, the synchronizer ring 20 is completed, which is provided with a single annularly extending circumferential oil groove 9. This interval can be set arbitrarily. Also,
If the number of oil grooves 9 in the circumferential direction is not increased, this can be done by increasing the number of paper liners 7 to be bonded. In the second embodiment as well, the axial oil groove 8 is formed during or after bonding.

In the first and second embodiments described above, the friction surface of the core ring 1, that is, the conical surface 4 is located on the inner periphery of the core ring 1, but the conical surface 4 is located on the outer periphery of the core ring 1. It goes without saying that the manufacturing method of the present invention can be applied even in certain cases. Further, each step does not necessarily have to be performed continuously, and may be performed batchwise.

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

There is no need to provide a circumferential oil groove after bonding the friction material to the conical surface of the synchronizer ring, so the process is reduced to 1.
decrease by one.

Since no circumferential oil grooves are formed by machining after bonding, there is no burr or burr caused by machining. The function of the synchronizer ring is improved because the alignment of the gear relative to the corresponding conical surface is not adversely affected.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the method for manufacturing a synchronizer ring according to the present invention, and FIG. 2 is a diagram showing a second embodiment of the method for manufacturing a synchronizer ring according to the present invention. . [Description of symbols of main parts] 1. Core ring 4. Conical surface 5.7. , , , paper liner 5a, 9. , , , Circumferential oil groove 6.8. , , , axial oil groove 10.20. ,,,synchronizer ring

Claims (1)

[Scope of Claims] 1. A synchronizer ring for a gear transmission that has a friction material in which gears are brought into synchronous meshing by the friction of conical surfaces, and oil grooves in the circumferential direction are formed in the conical surfaces. A manufacturing method comprising: a punching step of punching out a friction material from an original plate; a forming step of molding the friction material into a shape that fits the conical surface; and a step of bonding the friction material to the conical surface. A method for manufacturing a synchronizer ring, comprising an oil groove forming step of forming a circumferential oil groove in the friction material before or during the bonding step. 2. The synchronizer according to claim 1, wherein the oil groove forming step is performed before the bonding step and between the punching step and the molding step.
How to make a ring. 3. The oil groove forming step is characterized in that two or more of the friction materials are provided at a predetermined distance from each other in the axial direction during the adhesion step. Method of manufacturing synchronizer rings. 4. Manufacture of a synchronizer ring according to any one of claims 2 or 3, wherein the friction material is a paper liner made of a paper base material impregnated with a thermosetting resin. Method.