JPH03229026A - Disk pad and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent or minimize brake squeak by making the specific gravity of central portion of a frictional member larger than that of the peripheral portion. CONSTITUTION:After a frictional member 1 is stuck to a back metal 2, slide surfaces are opposed to each other and set in a heat treatment jig 3. Further, a spacer 4 is interposed in the central portion between both slide surfaces to be subjected to heat treatment while being pressurized. Thus, the end of the frictional member 1 is made softer than the central portion. When pressure on the end is partially raised, the winding inclusion of a disk pad into a rotor can be prevented by hardly changing compression strain due to compression deformation. Thus, the brake squeak can be prevented or minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc pad used in braking devices for automobiles and the like, and a method for manufacturing the same.

(Prior Art) Disc pads are used as braking devices for automobiles and the like, but the disc pads generate an unpleasant noise called brake squeal when braking. Therefore, in order to prevent this brake squeal, plate-shaped anti-silk material (stainless steel, rubber coated plate, etc.) is interposed between the backing metal and the piston, and between the backing metal and the yoke, and the caliper, torque, backing metal, etc. The rigidity was improved.

(Problems to be Solved by the Invention) According to the above method, the greater the porosity of the friction member, the better the brake squeal is improved. The disadvantage is that the performance on the ring is degraded.

The present invention hardly changes compression strain.

The object of the present invention is to provide a disc pad that prevents or reduces brake squeal as much as possible, and a method for manufacturing the same.

(Means for Solving the Problems) The present inventors have discovered that the inner and outer disc pads exhibit a behavior in which the artificial end of the rotor gets caught up in the rotor, and in this case, the specific gravity of the end is higher than that of the center, resulting in deformation. As a result of various studies, we found that if the material is difficult to handle, the end will easily get caught in the rotor, which in the worst case can cause abnormal vibrations.

He completed the present invention by discovering that by making the ends softer than the center, when the pressure at the ends becomes higher than the center, compression deformation can hardly change the compressive strain and prevent it from getting caught in the rotor. I came to the conclusion.

The present invention relates to a disk pad in which the specific gravity of the central portion of a friction member is greater than that of its peripheral portion, and a method for manufacturing a disk pad in which the friction member and a backing metal are bonded together and then heat-treated while pressurizing the central portion of the friction member.

In the present invention, it is preferable that the difference in specific gravity between the central part and the peripheral part is in the range of 005 to 020. The range of pressurization conditions Vi4 and 5X10≧Pa.

The heat treatment is preferably carried out at a temperature in the range of 190 to 210°C.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, after bonding the friction member 1 and the matching metal 2, they are set in a heat treatment jig 3 with their sliding surfaces facing each other, and a sliding member is placed in the center of the opening between both sliding surfaces. Approximately 40% of the moving surface
A semi-metallic disc pad of the present invention was obtained by heat treatment at a temperature of 200° C. while applying a pressure of 5×10 5 Pa with a spacer 4 having a size of . In FIG. 1, reference numeral 5 denotes a spring for pressurizing the friction member 1.

When we measured the specific gravity of the obtained disc pad, the central part was 3.63, and the peripheral part without the spacer was 3.63.
．． It was 49.

Next, a brake squeal comparison test was conducted on a disc pad according to an embodiment of the present invention and a conventional disc pad (one in which no pressure is applied to the center of the friction member).

The test conditions were as shown in Table 1, where the oil pressure and temperature were varied and the disc brake was operated for 3 cycles (
1 cycle from (1) to 0) was measured. The measured results are shown in Table 2.

As is clear from Table 2, it can be seen that the disc ballad according to the present invention has a low barking frequency and is effective against dogs. On the other hand, conventional disc pads have a squeal of W4 degrees of 5.
It was large, over 0chi.

(Effects of the Invention) According to the present invention, it is possible to obtain a disc pad that can prevent or reduce brake squeal as much as possible without substantially changing compressive strain.

[Brief explanation of drawings]

FIG. 1 is a partially omitted sectional view showing a state in which a disk pad according to an embodiment of the present invention is obtained by heat-treating the center portion of a friction member while pressurizing it. Explanation of symbols

Claims (1)

[Claims] 1. A disk pad in which the specific gravity of the central portion of the friction member is greater than that of the peripheral portion. 2. A method for manufacturing a disk pad, which comprises bonding the friction member and the back metal, and then heat-treating the center part of the friction member while applying pressure.