Device for controlling hydraulic pressure for braking a vehicle

Details Device for controlling hydraulic pressure for braking a vehicle Device for controlling hydraulic pressure for braking a vehicle

1983-08-18

1985-10-22

Reger, Duane A.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

B60T 822

Patent

active

045484457

ABSTRACT:
Disclosed is an improved device for controlling hydraulic pressure for braking a vehicle of the type including a pressure reducing valve disposed midway of an oil passage extending between an output port of a master cylinder and a rear wheel brake, said pressure reducing valve being adapted to proportionally reduce hydraulic pressure from the output port and then transmit reduced hydraulic pressure to the rear wheel brake. The improvement consists in that a pneumatic spring incorporated in a suspension system for determining hydraulic pressure at which the pressure reducing valve initiates pressure reducing function in dependence on the weight of cargoes loaded on the vehicle is operatively connected to a valve body of the pressure reducing valve in such a manner as to bias the valve body in the valve opening direction. Further, a mechanical spring is arranged for determining hydraulic pressure at which the pressure reducing valve initiates its pressure reducing function in the event that the pneumatic spring is in trouble. Alternatively, two pneumatic springs may be provided in such a manner that intended pressure reducing function can be assured by means of one of them when the other one fails to function properly.

REFERENCES:
patent: 3501203 (1970-03-01), Falk
patent: 3712684 (1973-01-01), Cordiano

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