Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1986-11-26
1988-12-06
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
13759617, 25112921, 303116, 303119, B60T 842, B60T 1368, B60T 1502
Patent
active
047892080
ABSTRACT:
An anti-locking modulator for reducing braking pressure applied to brakes during anti-locking operation dependent upon pressure in a pressure chamber. An input solenoid valve supplies pressurized fluid to the control chamber and is weakly biased to be closed so that a reduction of pressure in the pressure chamber opens the input solenoid valve for repressurization. Electrical activation of the input solenoid positively closes the input solenoid valve. An output solenoid connecting the pressure chamber to near atmospheric pressure valve is biased against the chamber pressure to be closed to thereby prevent overpressurization. Electrical activation of the output solenoid opens the output solenoid valve, thereby depressurizing the pressure chamber.
REFERENCES:
patent: 3602554 (1971-08-01), Ichimura et al.
patent: 3729169 (1973-04-01), MacDuff
patent: 3747990 (1973-07-01), Tanguy
patent: 4036534 (1977-07-01), Kondo et al.
patent: 4116495 (1978-09-01), Belart
patent: 4561701 (1985-12-01), Fujii et al.
patent: 4668024 (1987-05-01), Nakanishi et al.
Butler Douglas C.
Sumitomo Electric Industries Ltd.
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