JPH04327335A - Manufacture of synchronizer cone - Google Patents

Abstract

PURPOSE:To provide the method for forming the whole aynchronizer cone by press working. CONSTITUTION:By a press punching process 1, an annular plate having a claw projection on the outside periupheral edge is formed, and its annular plate is formed in a tapered shape by a cupping process 3. The claw projection which rises in the drawing direction is subjected to press working in its drawing direction, by which a claw is formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a synchronizer cone constituting a synchronizer mechanism of a transmission.

0002

[Prior Art] Recent vehicle transmissions include
As shown in FIG. 6, a synchronizer 20 is provided between a synchronizer 22 which is prevented from rotating on an output shaft 21 and a speed change gear 23.
There are some models that have a built-in system that allows for smooth gear changes.

This synchronizer mechanism 20 is provided with a sleeve 24 on the outside of a synchronizer 22 that slidably engages with teeth on the outer periphery of the synchronizer, and the sleeve 24 and a synchronizer cone 25 attached to an end surface of a transmission gear 23. A synchronizer ring 26 is provided between the cone 25 and the tapered surface 27, and as the sleeve 24 moves in the axial direction, the ring 26 and the tapered surfaces of the cone 25 are brought into contact with each other. 26 and the sleeve 24 and the transmission gear 23 are rotated synchronously,
In this synchronous rotation state, the teeth of the sleeve 24 are connected to the gear 23.
It is designed to mesh with the clutch gear 28 of.

The synchronizer cone 25 has a tapered annular plate 12 in sliding contact with a ring 26, and a transmission gear 2.
The annular plate 12 and the claws 13' have a shape in order to achieve smooth synchronization with the ring 26. High accuracy is required in dimensions and dimensions. For this reason, the conventional synchronizer cone 25 is manufactured by cutting out a bar material or a pipe material by cutting or the like in order to stably obtain the necessary precision.

[0005]

[Problems to be Solved by the Invention] However, in this method of manufacturing cones by machining, rough machining and finishing machining must be performed together in order to achieve the required precision. There is a problem in that setup takes a long time and it is difficult to reduce manufacturing time and costs.

In particular, the pawl 13' that engages without play in the end groove 29 of the transmission gear 23 requires a curved shape and high dimensional accuracy, which increases the number of machining steps and increases the cost. This is a contributing factor. In addition, since many parts of the raw material are turned into chips by cutting, there is a problem that there is a lot of waste and the material cost is relatively high.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a synchronizer cone by pressing without using cutting.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the present invention involves forming an annular plate having claw protrusions on the outer periphery by press punching, and then performing cylindrical drawing on the annular plate and pressing. The claws were formed by processing.

[0009]

[Operation] When an annular plate having claw protrusions on the outer periphery is cylindrically drawn, the protrusions rise along the drawing direction along with the ends of the annular plate. Further, by press working the claw protrusions, the claws can be formed in a predetermined direction and shape with respect to the annular plate.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the manufacturing method of this embodiment includes a press punching step 1, a claw preforming step 2, a cylindrical drawing step 3, and a final claw forming step 4.

The press punching process 1 is for forming a blank for forming a synchronizer cone from a flat steel plate, and is comprised of an irregular-shaped blank punching process 5 and an inner diameter punching process 6. That is, as shown in FIG. 2(A), first, the outer shape of the blank is punched out from a steel plate, and then, as shown in FIG.
Press out the inner diameter of the blank as shown in (b). As a result, an annular plate 12 having a plurality of claw protrusions 13 on its outer periphery is formed.

[0012] The annular plate 5 thus formed is then
In the claw preforming step 2, the claw protrusion 6 is pressed in the thickness direction to form a predetermined thickness shape (claw end surface pressing process 7), as shown in FIG. (
As shown in d), the outer diameter of the claw protrusion 6 is pressed out,
The height dimensions of each protrusion relative to the annular plate are made equal (claw outer diameter removal process 8).

In the cylindrical drawing step 3, the annular plate 12 formed as described above is inserted between upper and lower molds 14 and 15 having tapered molding surfaces, as shown in FIGS. 3(a) and 3(b). The annular plate is pressed into a cylindrical shape with a tapered shape as shown in FIG. 2(e). In addition, after this cylindrical drawing process,
Drawing processing for correcting distortion may also be performed.

By the drawing process described above, the pawl projections 13 integrally formed on the outer peripheral edge of the annular plate 12 are formed along the drawing direction of the molds 14 and 15, that is, in the annular shape, as shown in FIG. 3(b). Although the claws stand up along the tapered shape of the plate 12, the claws may not have a regular shape by the time the drawing process is completed.

[0015] Therefore, in the final forming step 4 of the nail,
First, as shown in FIG. 4, with the annular plate 12 fixed,
The protrusions 13 are pressed in the drawing direction by the mold 16, and the nails are erected in a predetermined direction (nail raising process 10).

[0016] The protrusions 13 that have been nailed in this way are then pressed in the height direction in a molding and pressing process 11.
As shown in FIG. 5, the R shape of both side surfaces 13a and 13a and the positional accuracy of the claws with respect to the reference lines x and y are determined.

In addition, in the manufacturing method shown in FIG.
It may be performed after. Further, in the press punching step 1, the irregular shape blank punching process 5 and the inner diameter punching process 6 can be performed simultaneously.

Furthermore, in the above embodiment, the final forming process of the pawls was carried out after the cylindrical drawing process for the annular plate, but the cylindrical drawing process was carried out after completing the forming process of the pawls by press working. You can do it like this.

[0019]

[Effect] As described above, in the manufacturing method of the present invention, the entire synchronizer cone is formed by press processing, so the cutting portion is significantly reduced, reducing costs and processing cycle time. It is possible,
This has the effect of enabling high-efficiency manufacturing at low cost.

[Brief explanation of drawings]

[Figure 1] Block diagram showing the manufacturing method of the example

[Figure 2] Diagram showing the processed shape of the manufacturing process

[Figure 3] a is a diagram showing the processing form of the cylindrical drawing process, b is its action diagram

[Figure 4] Diagram showing the processing form of nail raising processing

[Figure 5] Diagram showing the molded shape of the nail

[Figure 6] Cross-sectional view showing the synchronization mechanism of the transmission

[Fig. 7] Perspective view showing the synchronizer cone

[Explanation of symbols]

1　Press molding process 2 Preforming process of nails 3 Cylindrical drawing process 4 Final forming process of nails 12 Annular plate 13. Claw protrusion 13' nail 25 Synchronizer cone

Claims (1)

[Claims] 1. A synchronizer cone characterized by forming an annular plate having claw protrusions on the outer periphery by press punching, and then performing cylindrical drawing on the annular plate and forming the claws by press working. manufacturing method.