JPH06337023A - Manufacture of mating plate - Google Patents

Abstract

PURPOSE:To provide a stable frictional characteristic between a mating plate and a friction plate by polishing the surface of a mating plate which has the surface unworked and is pressed, by a brush to deburr, roughening the surface to be projected and recessed to form oil grooves, and rounding angles of the projecting parts. CONSTITUTION:The steel plate made by SPCC2B, S55CM or the like, the surface of which is unworked, is pressed in the form of a mating plate 8, and placed on a magnet table 20, and a brush 21 is brought into contact with the surface of the plate. While the brush 21 is rotated in the direction of an arrow A and moved in the direction of an arrow B, the table 20 is rotated in the direction of an arrow C, burr generated by pressing is removed. Radial oil grooves 30 are formed on the surface of the polished mating plate 8, and the projecting and recess parts for roughening the surface are formed in such a manner that the angles of the projecting parts are rounded. Thus, the attack to the facing by the angles of the projecting parts can be restrained, so that the contacting of the mating plate with the facing can be substantially fixed at the beginning of use so as to obtain a stable frictional characteristic early.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a mating plate, which is a component of a wet multi-plate clutch / brake, and more particularly to a method for processing the surface.

[0002]

2. Description of the Related Art In wet type multi-plate clutches and brakes, a mating plate that rotates integrally with the input shaft side is attached to a friction plate that rotates integrally with the output shaft side by means of hydraulic pressure, air pressure, spring pressure, etc. The torque is transmitted from the input shaft side to the output shaft side by pressing with a piston that moves in the direction. That is, when transmitting torque, the surface of the mating plate is pressed against the facing of the friction plate. The surface of the mating plate is rough so as to ensure a predetermined friction characteristic between the mating plate and the facing.

Conventionally, the surface of the mating plate has been roughened by barrel polishing because it is necessary to remove burrs after pressing. However, as shown in FIG. 8 which is an enlarged cross-sectional view of the surface of the mating plate, if the surface is roughened by forming irregularities on the surface by barrel polishing, the convex portions of the irregularities have sharply pointed shapes. turn into. Since the pointed portion of the convex portion easily attacks the facing, the facing of the mating plate to the facing is not constant until the pointed portion is worn away. That is, in order that the contact of the mating plate with the facing becomes constant, that is, the surface of the mating plate becomes familiar with the facing so that stable friction characteristics can be obtained, the pointed portion of the convex portion is worn away. It has been necessary to repeat the number of times of use, and there is a problem that stable friction characteristics cannot be obtained from an early stage. FIG. 9 shows a waveform of the torque transmitted to the output shaft side when the mating plate is pressed against the friction plate by the piston for T seconds, and (A) shows the case of the 50th press contact between the mating plate and the facing. (B) is the 200th time, (C) is 2000
The case of the second time is shown. Generally, it is considered that the surface of the mating plate is in a state in which it has been adapted to facing when pressed about 2000 times. (A), (B)
There is a sharp part (X part in the figure) which is not seen in the waveform of (C), that is, the waveforms of (A) and (B) are (C).
It is clear that the frictional characteristics between the mating plate and the facing are not stable when the number of times of use is small.

In addition, a groove for holding oil is generally formed in the mating plate, and a mating plate having such an oil groove is disclosed in, for example, Japanese Patent Laid-Open No. 6-58242.
It was manufactured by the method shown in 3-43038. That is, the strip steel sheet was subjected to rolling work for forming an oil groove, further rolling work for flattening, and thereafter, pressed into the shape of a mating plate and subjected to deburring treatment. In this method, since the rolling work is performed twice, it is troublesome and the work efficiency is poor.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a manufacturing method capable of obtaining a mating plate which can obtain stable friction characteristics between the friction plate and the friction plate at an early stage with good work efficiency.

[0006]

In the method for producing a mating plate of the present invention, the surface of the mating plate that has not been surface-processed and has been pressed is brush-polished to deburr the surface of the mating plate. It is characterized in that the groove is roughened to form an oil groove and the corners of the protrusion are rounded.

[0007]

Action The attack on the facing by the corners of the protrusions on the surface of the mating plate is suppressed because the corners of the protrusions are rounded.

By deburring and forming oil grooves by brush polishing, working efficiency is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a wet multi-plate clutch / brake provided with a mating plate obtained by the method of the present invention. Reference numeral 1 denotes a housing that rotates integrally with an input shaft (not shown). The housing 1 is a circular plate-shaped vertical portion 1a that is concentric with the input shaft, and a cylinder that extends axially from the outer peripheral end of the vertical portion 1a. It is composed of a portion 1b. An annular piston 2 is axially slidably fitted to the inner periphery of the cylindrical portion 1b near the vertical portion 1a, and an oil chamber 3 is formed between the vertical portion 1a and the piston 2. There is. Reference numeral 4 denotes an annular seal member that seals between the outer peripheral surface of the piston 2 and the inner peripheral surface of the tubular portion 1b. A plurality of grooves 5 extending in the axial direction are formed at appropriate intervals in the circumferential direction on the inner circumference on the tip side of the tubular portion 1b.

Reference numeral 6 is a cylindrical output boss which rotates integrally with an output shaft (not shown) concentric with the input shaft. The outer periphery of the output boss 6 and the inner periphery of the tubular portion 1b are opposed to each other at a predetermined interval in the radial direction, and a groove 7 extending in the axial direction is formed on the outer periphery of the output boss 6 in the circumferential direction. A plurality are formed at intervals.

A plurality of annular plate-shaped mating plates 8 and friction plates 9 are alternately arranged in an annular space between the outer periphery of the output boss 6 and the inner periphery of the tubular portion 1b.
Facings 10 are fixed to both surfaces of the friction plate 9. A plurality of protrusions 8a are integrally provided on the outer periphery of the mating plate 8 at appropriate intervals in the circumferential direction, and these protrusions 8a are slidably fitted in the grooves 5 of the tubular portion 1b. is doing. A plurality of protrusions 9a are integrally provided on the inner periphery of the friction plate 9 at appropriate intervals in the circumferential direction, and these protrusions 9a are slidably fitted in the grooves 7 of the output boss 6. is doing. That is, the mating plate 8 is movable in the axial direction and rotates integrally with the housing 1,
The friction plate 9 is movable in the axial direction and rotates together with the output boss 6. Reference numeral 11 denotes an annular disc spring, 12 denotes an annular stopper, and the stopper 12 restricts the movement of the mating plate 8 and the friction plate 9 to the right side in the drawing.

Next, a method of manufacturing the mating plate 8 will be described. First, for example, SPCC2B, S55
Prepare a steel plate such as CM. In addition, this steel plate has a surface unprocessed. That is, processing such as groove formation is not performed. Next, this steel plate is pressed into the shape of the mating plate 8.

The surface of the mating plate 8,
That is, the surface facing the facing 10 is brush-polished to remove burrs generated by press working, and the surface is roughened to form an oil groove 30 (FIG. 4) and to form a convex portion. Round the corners. The surface roughness may be such that the surface roughness is 0.5a to 1.5a.

Brush polishing is performed as shown in FIG. That is, the pressed mating plate 8 is placed on a stand 20 made of a magnet, the brush 21 is brought into contact with the surface of the mating plate 8, and the brush 21 is moved in the B direction while rotating in the A direction and the stand 20 In the C direction. The brush 21 has a plurality of rod-shaped bodies 22 and a handle 2.
It is configured to be fixed in a state of being bundled in 3. The rod-shaped body 22 is made of abrasive grains formed in a rod shape by a resin adhesive. Note that FIG. 3 is a view on arrow III in FIG.

Radial oil grooves 30 are formed on the surface of the mating plate 8 that has been brush-polished in this manner, as shown in FIG. In addition, the unevenness that forms the surface roughly has a shape with rounded corners as shown in FIG. 5, which is an enlarged cross-sectional view of the surface, and there is an abnormally protruding projection on the surface. Not not.

The wet multi-plate clutch / brake constructed as described above operates as follows. When pressure oil is supplied to the oil chamber 3, the piston 2 moves to the right in FIG. 1 and presses the disc spring 11. The disc spring 11 gradually deforms and presses the adjacent mating plate 8 to the right, and the mating plate 8 is pressed against the facing 10 of the adjacent friction plate 9. When the disc spring 11 is completely pressed against the mating plate 8, the movement of the piston 2 is stopped and a predetermined torque is transmitted from the input shaft side to the output shaft side. At this time, the mating plate 8 is firmly pressed against the facing 10 of the friction plate 9, and both plates 8 and 9 are integrally rotated.

By the way, in the past, since the unevenness of the surface of the mating plate was formed by barrel polishing,
The corners of the protrusions were sharply pointed, and therefore, the facing of the mating plate was not constant until the pointed portions of the protrusions were worn away. However, the projections on the surface of the mating plate 8 obtained by the present invention have rounded corners by brush polishing. Therefore, the attack on the facing 10 due to the corner of the convex portion is suppressed, and the contact of the mating plate 8 with the facing 10 is substantially constant from the beginning of use. Therefore, stable friction characteristics between the mating plate 8 and the friction plate 9 can be obtained early. This is shown in FIG.
It can be understood from the torque waveforms shown in (A), (B) and (C). FIG. 6 is a diagram corresponding to FIG. 9 of the conventional example. As shown in FIG. 6, the torque waveforms of (A), (B), and (C) all have substantially the same shape. That is, the torque waveform in the case of the 50th press contact between the mating plate 8 and the facing 10 shown in (A) is the torque waveform in the case of the 2000th time shown in (C), that is, the torque when substantially stable friction characteristics are obtained. The waveform is substantially the same as that of the waveform, and stable friction characteristics are obtained about 50 times, that is, in a stage where the number of times of use is small. Further, since stable friction characteristics can be obtained from early on, there is little change with time in the friction characteristics. Further, as shown in A of FIG. 7, the change of the friction coefficient of the mating plate 8 with respect to the facing 10 is small. In FIG. 7, B shows the case of the conventional example, the horizontal axis shows the number of times of use, and the vertical axis shows the friction coefficient.

Further, in the method of the present invention, since the deburring is performed and the oil groove 30 is also formed by brush-polishing, the other work for forming the oil groove is unnecessary, and the work efficiency is improved. . That is, for example, JP-A-63-
Since the double rolling operation disclosed in Japanese Patent No. 43038 is unnecessary, the working efficiency is remarkably improved.

[0019]

As described above, according to the method for producing a mating plate of the present invention, the corners of the convex portions of the irregularities on the surface of the mating plate are rounded by brush polishing.
It is possible to obtain a mating plate that can quickly obtain stable friction characteristics between the friction plate and the friction plate. Moreover, since the deburring is performed and the oil groove is formed, the other work for forming the oil groove can be eliminated and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a wet multi-plate clutch / brake provided with a mating plate obtained by the method of the present invention.

FIG. 2 is a diagram showing a state of brush polishing work.

FIG. 3 is a view on arrow III in FIG. 2.

FIG. 4 is a diagram showing the surface of a mating plate after brush polishing.

FIG. 5 is an enlarged cross-sectional view of the surface of the mating plate after brush polishing.

FIG. 6 shows a waveform of the torque transmitted to the output shaft side when the piston presses the mating plate against the friction plate for T seconds, and (A) shows the case of the 50th press contact between the mating plate and the facing. , (B)
Shows the case of the 200th time, and (C) shows the case of the 2000th time.

FIG. 7 is a diagram showing a change in friction coefficient.

FIG. 8 is an enlarged cross-sectional view of the surface of a mating plate after barrel polishing in a conventional example.

FIG. 9 is a diagram corresponding to FIG. 6 in a conventional example.

[Explanation of symbols]

 8 Mating plate 9 Friction plate 21 Brush

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F16D 69/00 R

Claims (1)

[Claims] 1. A method for producing a mating plate, which is a component of a wet multi-plate clutch / brake, and which is pressed against a friction plate that rotates integrally with an output shaft side to transmit torque from the input shaft side, Deburring by brushing the surface of the mating plate that has not been surface-processed and has been pressed, and roughened the surface to form oil grooves and rounded the corners of the protrusions. A method for manufacturing a mating plate, comprising: