Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1987-11-13
1991-03-19
Oberley, Alvin E.
Fluid-pressure and analogous brake systems
Pipeless valves
303119, B60T 826
Patent
active
050005219
ABSTRACT:
A wheel cylinder and brake piston are formed in the brake caliper of each wheel of a vehicle. A piezoelectric device, which is formed of laminated piezoelectric elements, is formed in the brake caliper such that it is connected with the wheel cylinder. By applying a voltage to the piezoelectric elements the piston device is made to expand and contract to thereby vary the volume of the wheel cylinder. Brake fluid is supplied from the master cylinder to the wheel cylinder via fluid passage formed in the brake caliper and a control valve for opening and closing this passage is formed in the passage. When there is a high pressure in the wheel cylinder, the piezoelectric device expands and the control valve closes. Then, by lowering the voltage the piezoelectric device contracts and the pressure in the wheel cylinder decreases.
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"Four Years of Experience with 4-Wheel Antiskid Brake Systems (ABS)", Leiber and Czinczel, Society of Antomotive Engineers, Inc., 1983.
Inagaki Mitsuo
Majima Yozo
Matsui Kazuma
Suzuki Masahiko
Takeda Kenji
Nippon Soken Inc.
Nippondenso Co. Ltd.
Oberley Alvin E.
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