Disc brake assembly

Details Disc brake assembly Disc brake assembly

1995-03-27

2001-03-27

Schwartz, Christopher P. (Department: 3613)

Brakes

Wheel

Axially movable brake element or housing therefor

Reexamination Certificate

active

06206146

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disc brake assembly having a pair of brake shoes the friction pad members of which are pressed into contact with a disc rotor secured for rotation with a road wheel to apply a braking force to the road wheel.
2. Discussion of the Prior Art
In conventional disc brake assemblies, various counter-measures have been adapted to reduce brake noises caused by vibration of the disc rotor, brake shoes or the like. For example, Japanese Patent Laid-open Publication No. 3-79820 discloses a disc brake assembly in which the friction pad members of the brake shoes each are divided into two parts in a circumferential direction of the disc rotor to reduce brake noises. With the conventional countermeasures, however, the brake noises may not be sufficiently reduced.
Based on a theoretical analysis and experiments, the inventors have found the fact that the brake noises are caused by a vibration wave of three-nodes diametric mode, i.e. a vibration wave the one-wave length of which is one third (⅓) of a circumferential length of the disc rotor.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a disc brake assembly which is constructed to restrain the occurrence of the vibration wave of three-nodes diametric mode for reducing the brake noises in a more reliable manner.
According to the present invention, the object is accomplished by providing a disc brake assembly having a pair of brake shoes to be pressed into contact with a disc rotor secured to rotation with a road wheel, wherein each friction pad member of the brake shoes has an upper portion the width of which is determined to less than about {fraction (1/12)} of a circumferential length of the disc rotor at a position to be brought into frictional engagement with the upper portion of the friction pad member.
Preferably, the brake shoes each are provided a pair of laterally spaced friction pad members, wherein a distance between upper outermost opposite ends of each pair of the friction pad members is determined to be less than about
1
/
12
of the circumferential length of the disc rotor.


REFERENCES:
patent: 4076106 (1978-02-01), Bermingham
patent: 4240530 (1980-12-01), Tillenburg
patent: 4471858 (1984-09-01), Kawase
patent: 4600090 (1986-07-01), Feldmann
patent: 4705146 (1987-11-01), Tarter
patent: 5363943 (1994-11-01), Iwashita
patent: 5535860 (1996-07-01), Hummel
patent: 3-79820 (1991-04-01), None

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