Single actuator tandem brake pressure control valve

Details Single actuator tandem brake pressure control valve Single actuator tandem brake pressure control valve

1986-02-06

1987-06-09

Garrett, Robert E.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

With means to control the working fluid to one working...

91460, 60589, 13759614, F15B 1100, F15B 1702, B60T 1128

Patent

active

046711686

ABSTRACT:
Hydraulic assistance device, comprising a body (10) comprising a bore (12) in which a first piston mechanism and a second piston mechanism (18, 20) are slideably mounted, the first piston mechanism (18) being movable under the effect of the actuation of a third piston (16) slidably mounted in the body (10), and the second piston mechanism (20) being movable by the intermediary of a hydrostatic connection formed in a pressure chamber (22) defined between the first and the second piston mechanism (18, 20), a respective valve mechanism (60, 100) being associated with each piston mechanism (18, 20) in a respective hydraulic circuit between a source of fluid under pressure (52, 96) and a respective braking circuit (74, 110); and a third chamber (36) defined in the bore (12) between the first piston mechanism (18) and the third piston (16), the third chamber (36) being connected to a low pressure reservoir (25) through a passage in which a valve mechanism (42 ) is mounted, characterized in that the device incorporates a second valve mechanism (112) in a second passage (130, 132) between the third chamber (36) and the reservoir (25), the second valve mechanism (112) being sensitive to the pressure of the corresponding source of pressure (52) so that upon failure of this high pressure source, the second valve mechanism (112) closes so as to isolate the third chamber (36) from the reservoir (25).

REFERENCES:
patent: 2574969 (1951-11-01), Heidloff
patent: 2992533 (1961-07-01), Hodkinson
patent: 4075848 (1978-02-01), Ueda

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