JPH08326867A - Method of finishing the inner surface of the drive plate boss mounting part in the torque converter front cover - Google Patents

Abstract

PURPOSE: To provide method for finishing the inner surface of a boss attaching part for a drive plate in the front cover for a torque converter so that automation may be attempted as well as the production process may be simplified. CONSTITUTION: A method for finishing the inner surface 13a of a boss attaching part 13 for a drive plate in a front cover 10 for a torque converter, may be achieved by making work 20 of a front cover 10 for a torque converter formed in a prescribed shape be rotated around its shaft line, while a lock up roller 41 is brought in pressure contact with the inner surface finishing requiring part 13a of a boss attaching part 13 for the drive plate, and then the lock up roller 41 is moved in the radial direction of the work 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front cover for covering an engine side of a torque converter mounted on an automatic transmission of a vehicle, and more particularly to a method for finishing an inner surface of a drive plate boss mounting portion in the front cover.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional torque converter. A torque converter cover 2 of a torque converter 1 has a front cover 3 covering the engine side.
And a rear cover 4, and an airtight chamber is formed by joining the covers 3 and 4 together.

Further, a drive plate boss 5 for mounting a drive plate (not shown) and a pilot boss 6 serving as a reference for mounting the drive plate are attached to the front cover 3, a drive plate boss mounting portion 3a and a pilot boss mounting. The portions 3b are integrally fixed to each other by welding.

Furthermore, the lockup plate 7 is pressed against the inner surface finish portion of the drive plate boss mounting portion 3a of the front cover 3, that is, the lockup surface 3c, so that the lockup plate 7 rotates regardless of the oil flow. It is a mechanism that directly connects forces. Therefore,
In order to improve the lock-up performance, the lock-up surface 3c is made flat by cutting and polishing.

The front cover 3 described above is usually manufactured by the manufacturing process as shown in FIG.

That is, in the manufacturing process of the front cover 3, the process of drawing the disk-shaped work 8 shown in FIG. 4 (a) to form the flange corresponding portion 9a inclined to the outer peripheral edge over the entire circumference, Several steps are performed while gradually increasing the inclination angle of the flange corresponding portion 9a to form the flange portion 9 bent in the axial direction shown in FIG. 4 (b), and the pilot boss mounting portion 3b and the drive portion are provided near the central portion and the outer peripheral edge. After the plate boss mounting portions 3a are respectively molded, the pilot boss 6 and the drive plate boss 5 are fixed to the pilot boss mounting portion 3b and the drive plate boss mounting portion 3a shown in FIG. Drive plate boss mounting portion 3 shown in FIG.
The inner surface finishing portion 3c of a is cut and ground, and the inner surface 9b of the flange portion 9 is cut to fit the rear cover 4 with the fitting portion 9c.
Is formed.

[0007]

However, in the method of finishing the inner surface 3c of the drive plate boss mounting portion 3a of the front cover 3 described above, a machine for cutting and polishing the workpiece 8 that has been pressed in the previous step. It is necessary to move to a processing plant, and in addition, cutting debris is generated and a cleaning process is required. As a result, not only the physical distribution cost is increased, but also the manufacturing process cannot be automated.

[0008] The present invention has been made to solve the above-mentioned problems of the prior art.
It is an object of the present invention to provide a method for finishing the inner surface of a drive plate boss mounting portion in a torque converter front cover, which simplifies the manufacturing process and can be automated.

[0009]

In order to achieve the above object, a method of finishing an inner surface of a drive plate boss mounting portion in a torque converter front cover according to the present invention is a torque converter front formed into a predetermined shape. While rotating the work of the cover around its axis, the lockup roller is pressed against the inner surface finish portion of the drive plate boss mounting portion, and then the lockup roller is moved in the radial direction of the work. It is characterized by that.

[0010]

According to the present invention, the lock-up surface as the inner surface finisher of the drive plate boss mounting portion can be polished by the lock-up roller without cutting and polishing. As a result, it is not necessary to move a work formed by pressing into a predetermined shape to a machining factory, and in addition, a cleaning operation for cutting waste is unnecessary. As a result, the physical distribution cost can be reduced and the manufacturing process can be automated. Furthermore, since the lock-up surface is work hardened, its durability can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on the embodiments shown in the drawings.

As shown in FIG. 1, the present invention is a method of finishing the inner surface 13a of the drive plate boss mounting portion 13 of the torque converter front cover 10, which is formed into a predetermined shape. While rotating the work 20 of No. 10 around its axis, the lockup roller 41 is pressed against the inner surface finish portion 13a of the drive plate boss mounting portion 13, and then the lockup roller 41 is moved to the diameter of the work 20. It is characterized by moving in the direction.

Further, details of the manufacturing method of the present invention are shown in FIG.
It will be described based on.

First, in the first step, as shown in FIG. 2 (a), a disk-shaped work 20 having a predetermined diameter and a predetermined thickness is subjected to a drawing process so that the outer peripheral edge is 30 ° to 60 °. The inclined flange corresponding portion 11a is formed over the entire circumference, and the pilot boss mounting portion 1 is formed near the central portion and the outer peripheral edge.
2 and the drive plate boss mounting portion 13 are respectively molded.

Next, in the second step, as shown in FIG. 2 (b), the outer peripheral surface 30a has the flange portion 1 after molding.
A die 30 having a shape corresponding to the inner peripheral surface 11c and the fitting portion 11d of No. 1 is brought into contact with the inner surface of the work 20 obtained in the first step.

Then, as shown in FIG. 2C, the work 20 is rotated integrally with the die 30 about the axis XX. At the same time, the outer peripheral surface of the flange corresponding portion 11a bent at 30 ° to 60 ° is traced in the axial direction while being pressed by the roller 40 as indicated by the imaginary line from the bending point 11b. Is pressed against the outer peripheral surface of the mold 30, and the flange portion 11 bent in the axial direction and the inner peripheral surface 11c thereof are formed with a fitting portion 11d for fitting with a rear cover (not shown).

Next, in the third step, as shown in FIG. 2D, the pilot boss 14 is attached to the pilot boss mounting portion 12 and the drive plate boss mounting portion 13 of the work 20.
The drive plate boss 15 is fixed by arc welding.

Next, in the fourth step, as shown in FIG. 2 (e), the work 20 obtained in the third step is treated with its axis X.
While rotating about -X, the lockup roller 41 is pressed against the inner surface finish portion 13a of the drive plate boss mounting portion 13, and then the lockup roller 41 is moved in the radial direction of the work 20 (arrow AB). Direction). As a result, the inner surface finish required, that is, the lockup surface 13
a is molded and the front cover 10 is completed. In addition,
In the fourth step, for example, the work 20 is attached to an ordinary lathe, the lockup roller 41 is attached to the tool rest 42, and the lockup surface 13a is processed. The lock-up roller 41 is rotatably attached with its outer peripheral surface inclined with respect to the lock-up surface 13a, and the edge portion that abuts the lock-up surface 13a is formed into an arc having a predetermined radius. By reducing the number of surfaces, the surface pressure is increased and the processing load is reduced.

According to the method of finishing the inner surface 13a of the drive plate boss mounting portion 13 of the torque converter front cover 10 described above, the cutting work of the inner surface 13a can be omitted, so that the cutting waste is not generated and therefore the cleaning operation is performed. It becomes unnecessary. The inner surface 13a is work hardened by the lockup roller 41.

Further, according to the manufacturing method of this embodiment, the front cover 10 for the torque converter can be molded by the consistent roller molding, and the manufacturing process can be greatly simplified.

[0021]

As described above, according to the present invention, the surface roughness can be improved by the lock-up roller without cutting and polishing the lock-up surface as the inner surface finisher of the drive plate boss mounting portion. You can This eliminates the need for cleaning the cutting waste, reduces the manufacturing cost, and automates the manufacturing process. Furthermore, since the lock-up surface is work hardened, its durability can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process for finishing an inner surface of a drive plate boss mounting portion in a torque converter front cover according to the present invention.

FIG. 2 is an explanatory view showing details of the manufacturing process of the present invention.

FIG. 3 is an explanatory view showing a partially-broken torque converter according to a conventional example.

FIG. 4 is an explanatory diagram showing a manufacturing process of a torque converter front cover according to a conventional example.

[Explanation of symbols]

 10 Front Cover for Torque Converter 11 Flange Part 11a Flange Corresponding Part 11c Inner Surface 12 Pilot Boss Mounting Part 13 Drive Plate Boss Mounting Part 13a Inner Surface (Inner Finished Surface) 14 Pilot Boss 15 Work Plate Boss 20 Work 30 Mold 40 Roller 41 Lock-up roller

Claims (1)

[Claims] 1. A method of finishing an inner surface of a drive plate boss mounting portion of a torque converter front cover, which comprises rotating a work of the torque converter front cover formed into a predetermined shape around its axis. A drive plate in a torque converter front cover, wherein a lock-up roller is pressed against an inner surface finish portion of a drive plate boss mounting portion, and then the lock-up roller is moved in a radial direction of the work. For finishing the inner surface of the mounting boss mounting part.