Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1986-05-21
1987-09-01
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188158, 25112906, 310328, 303116, B60T 800, B60T 836, B60T 1368, B60T 1502
Patent
active
046904654
ABSTRACT:
A compact, piezoelectrically operated pressure modulator for antiskid control of a hydraulic braking system. In its simplest form, the modulator comprises a body in which are formed a main hydraulic passage adapted to connect the master cylinder to a wheel cylinder, and a pressure relief passage for relieving the pressure in the wheel cylinder. The main passage is opened and closed by a normally open shutoff valve operated by a piezoelectric actuator, and the relief passage is controlled by a normally closed shutoff valve operated by an associated piezoelectric actuator. Adjusting mechanisms are provided to adjust the axial position of the piezoelectric elements of the actuators in such a manner that the valve clearance of the shutoff valves is adjusted to an optimal amount.
REFERENCES:
patent: 4471256 (1984-09-01), Igashira et al.
patent: 4553059 (1985-11-01), Abe et al.
patent: 4602702 (1986-07-01), Ohta et al.
patent: 4603920 (1986-08-01), Otsuki et al.
patent: 4610427 (1986-09-01), Igashira et al.
patent: 4618189 (1986-10-01), Nakanishi et al.
patent: 4629039 (1986-12-01), Imoto et al.
Inagaki Mitsuo
Matsui Kazuma
Sasaya Hideaki
Takeda Kenji
Butler Douglas C.
Nippon Soken Inc.
Nippondenso Co. Ltd.
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