Drum brake

Details Drum brake Drum brake

1997-10-17

1999-10-12

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

F16D 5100

Patent

active

059643242

ABSTRACT:
A wheel cylinder for expanding the opposed edges at one longitudinal end of a pair of brake shoes includes a pair of drive pistons for pressing the ends of the respective brake shoes under a hydraulic pressure supplied to the first pressure chamber, and a pair of control pistons which receive at the base ends the hydraulic pressure from the master cylinder and receive at the front ends anchor reaction force by way of levers, the control pistons being displaced to close a normally-open input control valve for supplying hydraulic pressure to the first pressure chamber when the anchor reaction force becomes larger than the hydraulic pressure received from the master cylinder by a predetermined magnifying power. Accordingly, it is possible to increase the stability of the braking effect of a duo-servo type drum brake.

REFERENCES:
patent: 3047099 (1962-07-01), Dahle
patent: 3349875 (1967-10-01), Stelzer
patent: 4503954 (1985-03-01), Riquart et al.

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