Power plants – Pressure fluid source and motor – Apparatus having means responsive to or ameliorating the...
Patent
1988-06-27
1989-06-06
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Apparatus having means responsive to or ameliorating the...
60413, 91 5, 91 6, 91391R, F16D 3102, F15B 1310, F15B 2100
Patent
active
048359670
ABSTRACT:
A hydraulic booster equipped with an emergency accumulator, wherein reaction and power pistons are slidably fitted in a housing such that the two pistons define a power chamber therebetween. The booster includes a control valve having a normally closed power chamber passage formed therethrough so as to communicate with the power chamber, and a normally open passage connecting a pump and a reservoir. The valve is operated in response to an operation of the reaction piston, so as to restrict a fluid flow through the normally open passage from the pump toward the reservoir, thereby raising a pressure of the fluid delivered from the pump, and open the power chamber passage to apply the raised pressure to the power chamber. A pressure reducing device is provided in the power chamber passage, for reducing a fluid pressure in the power chamber passage and applying the reduced pressure to the power chamber, at least while a rate of fluid flow through the power chamber passage is higher than a preset limit. The emergency accumulator is connected between the pressure reducing device and the pump, for storing a portion of the fluid whose pressure is raised by the control valve, and supplying the power chamber with the stored fluid, in the event of a failure where a pressurized fluid cannot be fed from the pump.
REFERENCES:
patent: 3633363 (1972-01-01), Larsen
patent: 3733968 (1973-05-01), Bach
patent: 3998128 (1976-12-01), Adachi
patent: 4135435 (1979-01-01), Adachi
S.A.E. Report 730536 (published in 1973).
Garrett Robert E.
Toyota Jidosha & Kabushiki Kaisha
Williamson Mark A.
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