Powered brake system for vehicles

A powered brake system for vehicles comprising:

• wheel brake cylinders;
• a pump powered hydraulic pressure source;
• a reservoir hydraulically connected to said pump powered hydraulic pressure source;
• control valve means interposed between said wheel brake cylinders and said pump powered hydraulic pressure source for controlling the fluid pressure to said wheel brake cylinders;
• valve means interposed between said reservoir and said control valve means for connecting said wheel brake cylinders to either one of said reservoir and said control valve means;
• and
• orifice valve means interposed between said control valve means and said valve means for slowly and rapidly supplying the fluid pressure from said control valve means to said valve means in accordance with the pressure difference between said control valve means and one of said wheel brake cylinders under anti-skid conditions of said vehicle,
• wherein said valve means includes a main control valve electromagnetically actuated according to the skid condition of said wheel brake cylinders and a by-pass valve electromagnetically actuated according to the skid condition of said wheel brake cylinders.

A powered brake system for vehicles comprising:

• wheel brake cylinders;
• a pump powered hydraulic pressure source;
• a reservoir hydraulically connected to said pump powered hydraulic pressure source;
• control valve means interposed between said wheel brake cylinders and said pump powered hydraulic pressure source for controlling the fluid pressure to said wheel brake cyinders;
• valve means interposed between said reservoir and said control valve means for connecting said wheel brake cylinders to either one of said reservoir and said control valve means;
• orifice valve means interposed between said control valve means and said valve means for slowly and rapidly supplying the fluid pressure from said control valve means to said valve means in accordance with the pressure difference between said control valve means and one of said wheel brake cylinders under anti-skid conditions of said vehicle;
• accumulators connected to said control valve means;
• unloader valve means for supplying or cutting off the discharging hydraulic fluid of said pump powered hydraulic pressure source to said accumulators according to the fluid pressure within said accumulators;
• safety valve means interposed between said accumulators and said unloader valve means for distributing the hydraulic fluid from said unloader valve means to said accumulators and for cutting off the hydraulic fluid to lower one of said accumulators, when the fluid pressure difference between said accumulators is attained, to a predetermined value;
• and
• means for constantly maintaining the loading state of said unloader valve means regardless of the state of said unloader valve means upon anti-skid operation.

A powered brake system for vehicles comprising:

• wheel brake cylinders;
• a pump powered hydraulic pressure source;
• a reservoir hydraulically connected to said pump powered hydraulic pressure source;
• control valve means interposed between said wheel brake cylinders and said pump powered hydraulic pressure source for controlling the fluid pressure to said wheel brake cylinders;
• valve means interposed between said reservoir and said control valve means for connecting said wheel brake cylinders to either one of said reservoir and said control valve means;
• and
• orifice valve means interposed between said control valve means and said valve means for slowly and rapidly supplying the fluid pressure from said control valve means to said valve means in accordance with the pressure difference between said control valve means and one of said wheel brake cylinders under anti-skid conditions of said vehicle,
• wherein said orifice valve means includes a first fluid chamber fluidically connected to said control valve means by means of a first conduit, a second conduit connecting said first chamber to said valve means, an orifice disposed within said second conduit, a second fluid chamber fluidically connected to said control valve means by means of a third conduit, a fourth conduit connecting said second chamber to said valve means, and a spring-biased spool reciprocable within said orifice valve means so as to permit or prevent fluid communication through said second chamber between said third and fourth conduits in response to the fluid pressure within said first chamber.