JPS6053233A - Brake pad - Google Patents

Abstract

PURPOSE:To improve wear-resistance of a brake pad by providing a pad having the pressing surface in which the central portion and peripheral portion thereof are formed of materials different in wear-resistance. CONSTITUTION:A pad 2 joined to a metallic support 3 has both end portions 2a or a peripheral edge portion 2a formed by material having a hardness of HR15X .80-150 and the central portion 2b formed by material having a hardness of HR15X.40-80, which are solidly formed in inner and outer shell two-layers. In this arrangement, when piston P pressing is conducted through a support 3 during brake damping, the forward end portion 2a of the pad 2 with respect to the rotating direction of a disc 1 intercepts entering of mud by its wear-resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake pad in which the friction part with the brake disc is formed of a sintered metal material, and particularly for disc brakes of motorcycles etc. that run on muddy and rough roads. Concerning brake pads designed with wear resistance in mind.

Gunodo, which is formed from sintered alloy, is resistant to wear and can withstand high loads, making it suitable for vehicles such as automobiles and railways.
It is also widely used in disc brakes, drum brakes, and clutches of industrial machinery.

In particular, in the case of disc brake pads for vehicles such as motorcycles and three-wheeled vehicles, various considerations have been made to the wear resistance of the throat itself, since it is easily affected by mud on rough roads. The band itself is made of Cu, for example, inside the mold.
and Cu alloy or Pe and Ti'e alloy as a base, Pb, graphite, 5i02 (silica) and At
Often, a powder-like sintered alloy material having a composition of 203 (alumina) or the like is press-temporarily formed, then heated and pressure-formed onto a holder made of Fe-based metal, and integrally sintered and bonded. .

Pads with the composition described above have effects on brake performance such as temperature resistance, but when used in vehicles such as motorcycles, the amount of wear due to rough roads and muddy conditions is generally good. It shows a tendency to increase compared to roads. Figures 1 (a) and (b) illustrate the relationship between the rotating disk 1, guno 2, and mud 4 during driving and braking, respectively, when driving on a rough road. It is something. As shown in the figure, as the brakes are repeatedly applied over time, the front end 2α of the pad 2 in the rotational direction of the disc 1 is worn out, and as a result, the pad 2 tends to get stuck in mud 4. ((b) in the same figure) The present invention was made in view of the current circumstances regarding brake pads, and the present invention has been developed to provide brake pads with excellent wear resistance against muddy soil and muddy soil containing a large amount of water. The purpose is to provide Tsudo.

For this reason, in the present invention, the suppression surface of the groove against the side surface of the disk is made of a material with different wear resistance in the center and the periphery, specifically, the periphery is made of a different material with better wear resistance than the center. It is characterized by a structure formed from two pieces of wood.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 2 schematically shows the relationship between the pad 2 and the disc l according to the embodiment, during running and during braking. The throat 2 is made of a material with a hardness of HR 15X/80 to 150 for both ends 2α, 2α or a peripheral part 2α, and the center part 2b is made of a material with a hardness of 11N, 15X/40 to 80, and has two inner and outer shell layers. It is integrally molded into. The material of the central portion 2b is a sintered alloy material made of Cu and Cu alloy as described at the beginning and containing other metal elements.

The material of both end portions 2α, 2α (or peripheral portion 2ff) is made of pg-based smoked material within a range that does not cause scratches or wear on the disc 1 processed from stainless steel, in order to prevent wear against muddy soil. As the binding material, a material with as high density and hardness as possible, such as a Cu-based sintered material, is used. For reference, the disk 1 is made of a material with a hardness of about HR, C35+3.

Therefore, even if the piston P is pressurized through the holder 3 during braking, the front end 2α of the nodule 2 in the rotational direction of the disc 1 is covered with mud 4 due to its wear resistance. It explains the condition that blocks the bite.

More specifically, as shown in Fig. 3, when the vehicle is running without braking, mud 4 gets caught in the clearance between the disc 1 and the throat 2 (see Fig. 2 (a)).
The front end portion 2α of the mother throat 2 is not subject to wear due to the mud 8-4 due to its material, and the center portion 2b is subject to wear over time, resulting in the friction surface exhibiting a hollow state as shown by symbol F1. However, when it is pressed by the male stone P during braking, the entire joint 2 together with the holder 3 is bent downward and comes into contact with the disc 1 as shown by symbol F2, and the brake is applied to stop the rotation of the disc 1. perform a function.

As is clear from the above explanation, the present invention exhibits its effectiveness particularly when adopted as a disc brake pad for motorcycles, and as a result of long-term driving, the central part of the pad becomes like the F1. Although the blade falls in the middle, both ends have an appearance similar to a cutting edge with a rake angle, which increases the mud-scraping effect. Therefore, during braking, most of the mud is removed at the front end of the nod, and the center comes into contact with the side of the disc due to piston pressure, and the action of these two parts makes it possible to obtain efficient braking force. This is possible.

[Brief explanation of drawings]

Figures 1 (α) and (b) are plan views showing the conventional brake system when running = 4- and when braking, and Figures 2 (α) and (b).
) are plan sectional views showing the above-mentioned aspects of the present invention, and the third
The figure is a plan sectional view showing the details. Explanation of symbols of main parts 1...Disc 2...Pad 2α...Both ends (or peripheral parts) 2b...Central part 3.
...Metal holding body 4...Mud soil F1...Friction surface at the center of the throat during driving F2...Friction surface at the center of the throat during braking P...Piston pressurization Applicant Honda Motor Co., Ltd. Agent Patent Attorney Motohiko Fujimura

Claims (1)

[Claims] A brake pad in which a sintered alloy friction material bonded to a metal holder is pressed against a side surface of a disc, wherein the sintered alloy friction material has a lower wear resistance in the suppressing portion in the peripheral portion than in the central portion. A brake pad characterized by being integrally molded from dissimilar materials with high densities.