Power plants – Pressure fluid source and motor – Pulsator
Patent
1986-08-08
1989-01-24
Chambers, A. Michael
Power plants
Pressure fluid source and motor
Pulsator
60486, 417385, 417425, B60T 1120
Patent
active
047993553
ABSTRACT:
The present specification discloses a brake actuation system for a vehicle, which is applicable to both hydraulically or pneumatically operated/spring released brakes and spring operated/hydraulically or pneumatically released brakes. With such brakes it is often necessary to have secondary means for brake operation or release. Such braking systems thus have primary and secondary means for brake operation or release. The present invention provides a fail-safe system which can provide at least an indication of impending failure. The brake actuation system of the present invention comprises a cylinder within which two axially aligned pistons are axially slidable, the space between one end of the cylinder and one piston being connected to a primary power system and the space between said pistons being connected to a secondary power system. When such an actuation system is used in a spring operated/hydraulically released braking system, the primary power system of the present invention is the primary brake release and the secondary power system is a secondary or emergency release which may constitute a handpump. By providing suitable flow detection means in the primary and secondary power systems, leakage past piston seals can be monitored and detected before the seal failure is sufficient to dangerously affect brake performance.
REFERENCES:
patent: 54291 (1866-05-01), Cameron
patent: 1797245 (1931-03-01), Schaer
patent: 2413876 (1947-01-01), Lefler
patent: 4087968 (1978-05-01), Bianchetta
patent: 4117681 (1978-10-01), Falk
patent: 4364336 (1982-12-01), Skala
Chambers A. Michael
Lucas Industries Public Limited Company
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