Fluid-pressure and analogous brake systems – Motorman's valves
Patent
1978-01-18
1980-01-01
Hershkovitz, Abraham
Fluid-pressure and analogous brake systems
Motorman's valves
303 10, 60547B, 60582, 91 32, B60T 1316, B60T 1314
Patent
active
041813715
ABSTRACT:
A power brake control device for vehicles disposed between a manual brake operating member and wheel brake members which includes an accumulator, a housing including a first inlet port connected to a hydraulic pressure source, a second inlet port connected to the accumulator hydraulically disposed and interconnected between the pressure source and the first inlet port, a first outlet port hydraulically connected to the wheel brake members and a second outlet port connected to the reservoir. A spool valve is also slidably disposed within the housing and is movable by operation of the manual brake operating member for controlling hydraulic communication between the first inlet and the second outlet port with a piston being slidably disposed within the housing for connecting the first outlet port with the first inlet port, one end of the piston being secured to the spool valve for unitary movement therewith. An emergency valve is also disposed within the housing between the second inlet port and the first outlet port and also disposed adjacent an end of the piston opposite the one end wherein the piston is movable between a first position in which the fluid from the first inlet port under pressure, controlled by the spool valve, is in hydraulic communication with the first outlet port and a second position in which the end opposite the one end of the piston is engaged with the emergency valve, wherein the emergency valve is actuated to first interrupt hydraulic communication between the first inlet port and the first outlet port and to thereafter establish hydraulic communication between the second inlet port and the first outlet port.
REFERENCES:
patent: 3539227 (1970-11-01), Drutchas
patent: 3633363 (1972-01-01), Larsen
patent: 3918765 (1975-11-01), Hayashida
patent: 3995529 (1976-12-01), Bach
Aisin Seiki Kabushiki Kaisha
Hershkovitz Abraham
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