Spot-type disc brake with additional axial force application to

Details Spot-type disc brake with additional axial force application to Spot-type disc brake with additional axial force application to

1982-01-28

1984-04-24

Butler, Douglas C.

Brakes

Wheel

Axially movable brake element or housing therefor

188196R, F16D 6504

Patent

active

044442963

ABSTRACT:
A spot-type disc brake unit which cooperates with a brake disc when in use to form a disc brake includes a brake shoe carrier member and at least one brake shoe carried by the carrier member for axial movement toward and away from the brake disc, and with freedom of limited circumferential displacement upon entrainment of the brake shoe by the brake disc during the braking operation. The brake shoe includes a lining having a friction surface facing toward the brake disc and a backing plate rigid with the lining and having a backing surface facing away from the brake disc, as well as disc entry and disc exit, substantially circumferentially facing, end surfaces. A braking-force bell crank lever is arranged at least at the disc exit end surface of the backing plate. The lever has a first lever arm which extends into the path of circumferential displacement of the brake shoe, and a second lever arm which extends into juxtaposition with a selected region of the backing surface to apply an additional augmenting axial force to the brake shoe at such region. The lever has a fulcrum portion which engages an engagement surface of the carrier member to constitute a pivot axis for the lever therewith during the braking operation. Upon termination of the braking operation, the lever is attracted by a spring to the backing plate to compensate for the diminishment of the thickness of the lining attributable to the wear of the latter.

REFERENCES:
patent: 3422933 (1969-01-01), Van House et al.
patent: 3662864 (1972-05-01), Evans
patent: 3837438 (1974-09-01), Hollnagel

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