Balanced servomotor valve

Details Balanced servomotor valve Balanced servomotor valve

1975-08-11

1976-08-03

Schwadron, Martin P.

Power plants

Pressure fluid source and motor

Pulsator

60592, 91434, F15B 700

Patent

active

039721914

ABSTRACT:
In a servomotor having a first diameter piston concentric to a second diameter piston for supplying a braking system with a first pressurizing force and a second pressurizing force in response to an operator input. A transfer valve has a first face and a second face which are located on opposite sides of a radial bore in the second piston to receive a first pressurizing force. The transfer valve has an axial passageway therethrough which communicates relief or reservoir pressure to the first and second faces of the transfer valve to provide a balance pressure force on the same. A spring holds the second face of the transfer valve against a seat to prevent communication of the first pressurizing force into the relief chamber. When a predetermined first pressurizing force is obtained, the actuator in response to an operator will overcome the spring and move the second face away from the seat to allow the first pressurizing force associated with the first piston to be proportionally communicated into the relief chamber. As the first pressurizing force is communicated into the relief chamber, the output from the servomotor is transferred to the second piston to provide an additional operational or second pressurizing force to activate the wheel brakes of the vehicle.

REFERENCES:
patent: 3910046 (1975-10-01), Gardner et al.
patent: 3911681 (1975-10-01), Sisco

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