Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-03-26
1992-11-10
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031155, 3031161, 3031192, 60545, 60567, 60 59, F15B 500, B60T 832
Patent
active
051618656
ABSTRACT:
A system for controlling a fluid pressure such a brake fluid pressure of a vehicle includes a pressure control cylinder having a control piston for varying a pressure of a confined fluid, and a motor for producing a mechanical force for actuating the control piston. To reduce the load of the motor, a hydraulic assist circuit is interposed between the motor and the control piston. The hydraulic assist circuit creates a hydraulic assist pressure by receiving the force of the motor, and converting the assist pressure into a linear motion of the control piston. The mechanical force of the motor is converted to hydraulic assist pressure through a pressurizing piston. The hydraulic assist pressure created by the pressurizing piston is exerted against a working piston. The working piston is connected to the control piston. A reduced motor load is obtained by making the area of the working piston larger than the area of the control piston, and the area of the control piston larger than the area of the pressurizing piston.
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Fujishiro Takeshi
Higashimata Akira
Yoshioka Shigeki
Ballato Josie A.
Graham Matthew C.
Nissan Motor Co,. Ltd.
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