Fluid-pressure and analogous brake systems – Inertia control
Patent
1974-12-23
1976-01-27
Reger, Duane A.
Fluid-pressure and analogous brake systems
Inertia control
303 10, B60T 812
Patent
active
039349411
ABSTRACT:
A valve device includes primary and secondary fluid systems. The secondary fluid system includes source pressure and controlled pressure channels containing secondary fluid at source and controlled pressures, respectively. A master cylinder primary fluid source is connected through first and second parallel paths to a primary fluid portion of a changeover cavity which is also connected to the brake cylinders of a vehicle. The changeover cavity includes primary and secondary movable piston member therein, separating primary and secondary fluid portions thereof. Each parallel primary path includes a valve member for controlling the flow of primary fluid to the primary portion of the changeover cavity. The first primary valve member is mechanically operated by the primary movable piston member and the second primary valve member is operated by a blockout piston in the secondary fluid system which is responsive to the difference in pressure between the secondary source pressure and the controlled pressure of the secondary fluid. A secondary source pressure failure valve allows the pressure-controlled secondary fluid to pass into the secondary portion of the changeover cavity to control the position of the first and second movable piston members within the changeover cavity. The secondary source pressure failure valve is operable to isolate the secondary fluid in the secondary portion of the changeover cavity when the pressure of the secondary fluid source falls below a predetermined value. A control valve in the secondary fluid system is operated by a solenoid to block a normally open passage from the secondary fluid source to the controlled-pressure channels and open a passage from the controlled pressure channels to a low-pressure return port in response to an electrical signal indicative of a predetermined external condition.
REFERENCES:
patent: 3514161 (1970-05-01), Frayer
patent: 3544171 (1970-12-01), Lester et al.
patent: 3635531 (1972-01-01), Okamoto et al.
E-Systems Inc.
Reger Duane A.
Wilder Robert V.
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