Leakage-type pressure regulator for a hydraulic circuit

Details Leakage-type pressure regulator for a hydraulic circuit Leakage-type pressure regulator for a hydraulic circuit

1990-05-24

1991-09-24

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

303 59, 303 841, F04B 4902

Patent

active

050510630

ABSTRACT:
The leakage-type pressure regulator for a hydraulic circuit, including at least one reservoir of fluid under low pressure (5), a pump (11) and an accumulator of fluid under high pressure (9), comprises: a pusher (19) projecting from a chamber (3) connected to the reservoir (5); at least one sensor (27) detecting the position of a magnetic core (23) sliding under the effect of the pusher (19) in the vicinity of the sensor (27), so as to control the functioning of the pump (11); a piston (17) sliding non-sealingly in a bore (7) communicating with a chamber (3) on the one hand and with an outlet of the accumulator (9) on the other hand, so as to establish a leakage of the hydraulic fluid between the accumulator (9) and the reservoir (5), the piston (17) having one end bearing on the pusher (19); and an elastic means (21) opposing the effect of the pressure of the fluid in the accumulator (9) on the piston (17), in such a way that the position of the core (23) is a function of the pressure of the fluid in the accumulator (9).

REFERENCES:
patent: 4094554 (1978-06-01), Leiber
patent: 4476889 (1984-10-01), Haynes
patent: 4662605 (1987-05-01), Garcia
patent: 4744389 (1988-05-01), Ichihashi
patent: 4938541 (1990-07-01), Shaw et al.

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