Fluid-pressure and analogous brake systems – Releasing – Motor
Patent
1993-06-15
1995-06-20
Le, Mark T.
Fluid-pressure and analogous brake systems
Releasing
Motor
137102, B60T 1532
Patent
active
054255724
ABSTRACT:
A simplified and less-costly quick-release valve with controlled hysteresis for a vehicle spring-set air-release parking brake system lengthens the operating life of the valve, reduces energy consumption, extends compressor life and alleviates noise problems. The valve comprises a valve body and a plurality of internal passageways each of which is selectively connectable to at least another of the passageways. The selective connection is controlled by an integrally-formed flexural spring-brake-control release diaphragm within the valve body and disposed to either isolate or selectively connect the passageways depending on the relative pressure conditions within the passageways and respective areas of the diaphragm exposed to the pressures. The components are designed so that the normal variations or cycling of the supply or intake pressurized air does not cause cycling of the pressure in the spring-brake chambers.
REFERENCES:
patent: 259682 (1882-06-01), Gruber
patent: 1965070 (1934-07-01), Cumming
patent: 3340899 (1967-09-01), Welty et al.
patent: 4453780 (1984-06-01), Neal
patent: 4596265 (1986-06-01), Goodell
patent: 5078455 (1992-01-01), Washingotn
Koelzer Robert L.
Wallestad Steven D.
Le Mark T.
Midland Brake, Inc.
Poon Peter M.
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