Fluid pressure controller

Details Fluid pressure controller Fluid pressure controller

1989-11-14

1991-05-28

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

25112915, 303119, B60T 836

Patent

active

050187970

ABSTRACT:
A fluid pressure controller includes a housing formed with an input port, a discharge port and an output port, a spool axially slidably mounted in a bore provided in the housing, a spring for keeping the spool in its inoperative position, and an electricity/power converter for imparting to the spool an axial driving force corresponding to the amplitude of an electric signal applied to the converter. First and second chambers are defined by the inner peripheral surface of the bore and both end faces of the spool. The spool is formed with an internal passage connecting the first and second chambers together and having its intermediate portion throttled to form a fixed-size orifice and with a peripheral channel at a point between the first chamber and the fixed-size orifice so as to communicate with the internal passage. The output port normally communicates with the second chamber. The spool is movable among a first position where the peripheral channel communicates with the input port, a second position where it is shut off from both the input port and the output port and a third position where it communicates with the discharge port. Thus when the output port is brought into communication with either the input port or the discharge port through the peripheral channel, hydraulic fluid will flow through the fixed-size orifice, thereby creating a pressure difference at both ends of the orifice, the pressure difference being equal to the output of the converter minus the biasing force of the spring.

REFERENCES:
patent: 2877795 (1959-03-01), Cocklin
patent: 3820856 (1974-06-01), Adahan
patent: 3851930 (1974-12-01), Grosseau
patent: 4561628 (1985-12-01), Matsushima et al.
patent: 4836248 (1989-06-01), Stegmaier

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