Quantcast

Brake lining of brake device

Imported: 24 Feb '17 | Published: 06 Jan '04

Masato Yamaguchi, Yukio Takai, Hidetoshi Suzuki, Hideto Murakami, Takahiro Mibe, Takeshi Ito

USPTO - Utility Patents

Abstract

A brake lining of a vehicular brake device is produced by a friction material which has a characteristic that a friction coefficient of the friction material decreases according to an increase of a sliding speed between the brake lining and a rotational member when the sliding speed is greater than or equal to a predetermined speed during the braking operation, and the friction coefficient is substantially constant when the sliding speed is smaller than the predetermined speed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing a relationship between a sliding speed and a friction coefficient of a friction material employed in a brake lining of a brake device in according with the present invention.

FIG. 2 is a graph showing a change of the friction coefficient of the friction member according to the elapsed time in a case that the braking is executed at a constant depression force onto a brake pedal using the brake device of employing the friction member of FIG.

1.

FIG. 3 is a graph showing changes of a vehicle speed and the sliding speed according to the elapsed time during the braking operation.

FIG. 4 is a graph showing changes of braking energy according to the elapsed time and to a change of temperature, and a change of the friction coefficient according to a change of temperature, in addition to the characteristic curve in FIG.

2.

FIGS. 5A through 5C are graphs for explaining a combination of two friction materials to obtain an aimed characteristic of the friction coefficient of the friction material employed as a brake lining.

FIGS. 6A through 6D are views showing various arrangements of the two friction materials employed as a brake pad of a disc brake.

FIG. 7 is a developed view showing a positional relationship of a pair of the brake pads and a disc rotor in a disc brake in case that the arrangement of FIG. 6

c is adapted thereto.

FIGS. 8A and 8B are explanatory views explaining advantages of the arrangement in FIGS.

6A through

6D.

Claims

1. A brake lining of a vehicular brake device, the brake device executing a braking operation by forcing the brake lining into friction contact with a rotational member, the brake lining comprising:

2. The brake lining as claimed in claim 1, wherein a desired characteristic of the friction material is achieved by a combination of at least two frictional materials which are different in the characteristic of the friction coefficient relative to the sliding speed.

3. The brake lining as claimed in claim 2, wherein the at least two friction materials are arranged such that the rotational member always frictionally slides on the brake lining when the braking operation is being executed.

4. The brake lining as claimed in claim 2, wherein the brake device includes a disc brake which produces a braking force by a clamping action of a pair of the brake linings to the rotational member.

5. The brake lining as claimed in claim 4, wherein first and second friction materials are formed into first friction members and second fiction members, respectively, and the first and second friction members are arranged side by side alternately.

6. The brake lining as claimed in claim 4, wherein first and second friction materials are formed into first friction members and second fiction members, respectively, and the first and second friction members are arranged checkerwise.

7. The brake lining as claimed in claim 1, wherein the friction material is produced by a combination of first and second friction materials, the first material having a characteristic that a friction coefficient of the first friction material decreases according to an increase of the sliding speed, the second friction material having a characteristic that a friction coefficient of the second friction material takes about the same value when sliding speed is greater than a predetermined value and the friction coefficient of the second friction material increases according to the increase of the sliding speed when the sliding speed is smaller than the predetermined value.

8. A disc brake of a vehicle, comprising: