Fluid-pressure and analogous brake systems – With pump
Patent
1978-07-19
1980-05-20
Butler, Douglas C.
Fluid-pressure and analogous brake systems
With pump
60413, 60547R, 303 6R, B60T 1316
Patent
active
042036291
ABSTRACT:
A hydraulic servo-brake system for electrically driven vehicles, preferably trucks, having hydraulically driven working elements, such as lifting elements, tilting elements and the like, and having a control valve incorporated in a hydraulic supply-line system having a pump or arranged to cooperate with a pump, the supply-line system having a device arranged to accumulate control medium and a device for detecting the pressure in the supply-line system, the pressure-detecting device being arranged to cooperate with the pump in a manner such that the pump is activated when a given low-pressure value is sensed and is de-activated when a given high pressure value is sensed. The supply line system is connected, through a control valve, to a hydraulic cylinder having a piston, the hydraulic cylinder being connected to the master cylinder of the brake system, and which hydraulic cylinder is supplied with working medium from the supply-line system, the supply being in dependence upon the setting of the control valve, which setting is obtained by depression of a brake pedal. The return of the brake pedal from its depressed position to a free position permits the volume of working fluid enclosed in the hydraulic cylinder to pass to a reservoir via the control valve through a line. The piston rod of the piston of the hydraulic cylinder is arranged to actuate the piston rod of the piston of the master cylinder, end to end.
REFERENCES:
patent: 3176467 (1965-04-01), Van House
patent: 3719044 (1973-03-01), Bach
patent: 3747987 (1973-07-01), Hendrickson
patent: 3978667 (1976-09-01), OHara
patent: 3992882 (1976-11-01), Bodin
patent: 4052851 (1977-10-01), Brown
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