Hydraulic boosting device

Details Hydraulic boosting device Hydraulic boosting device

1997-11-13

1999-07-20

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Pulsator

60582, B60T 1320

Patent

active

059242841

ABSTRACT:
In a hydraulic boosting device of the present invention, when the pressure stored in an emergency accumulator is less than a set pressure, a stepped piston 70 moves downward, a throttle valve 72 is set in a first position where the throttle valve 72 is seated in a valve seat 71, and hydraulic fluid flowing from a pump through an inlet path 14 is restricted by a flow limiting valve 68 so as to develop a fluid pressure in an annular path 73. The fluid pressure is stored in the emergency accumulator through a path 69, an accumulator valve 27, and an accumulator path 31. When the pressure stored in the emergency accumulator exceeds the set pressure, the stepped piston 70 moves upward, the throttle valve 72 is set in a second position where the throttle valve 72 is apart from the valve seat 71, and the hydraulic fluid from the pump is not restricted by the flow limiting valve 68 at all so as to flow freely toward a control valve. In this state, no fluid pressure is developed in the annular path 73.

REFERENCES:
patent: 3978667 (1976-09-01), Ohara
patent: 4072011 (1978-02-01), Ewald
patent: 4702530 (1987-10-01), Belart et al.
patent: 4732001 (1988-03-01), Belart et al.
patent: 5038564 (1991-08-01), Horiuchi et al.
patent: 5577384 (1996-11-01), Watanabe et al.

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