Nonskid brake system for motor vehicle with pressurized hydraulic system

Claim 2

A motor-vehicle nonskid brake system comprising: a fluid-operated wheel brake; valve means connected to said brake; a brake-fluid reservoir connectible through said valve means to said brake; actuating means connectible through said valve means to said brake for actuating same, said actuating means having a drivercontrolled plunger and a chamber receiving said plunger, said valve means having a first position connecting said chamber of said actuating means with said brake for permitting brake-fluid flow therebetween, and a second position blocking brake-fluid flow between said actuating means and said brake while permitting brake-fluid flow between said brake and said reservoir; a fluid pressure source including a pressure accumulator maintained at an elevated fluid pressure independently of said actuating means and connected to said valve means for pressurization therethrough of said brake, said source being connected to said chamber at least upon operation of said plunger to actuate said brake and to render said plunger responsive to the presence of said source; and means responsive to motor-vehicle deceleration for controlling said valve means, said actuating means including a master cylinder and said valve means having a third position blocking brake-fluid flow between said brake and said reservoir and between said brake and said actuating means while permitting brake-fluid flow between said source and said wheel brake.

Claim 3

A dual-network brake system as defined in claim 1, further comprising a fluid-operated second wheel brake, and second actuating means connected to said second brake and linked with the first-mentioned actuating means for joint operation therewith.

Claim 4

The system defined in claim 2 wherein said second actuating means is said master cylinder.

Claim 5

The system defined in claim 1, wherein said source includes pump means for displacing brake fluid from said reservoir into said accumulator for pressurizing same, and a check valve between said pump means and said accumulator.

Claim 6

The system defined in claim 1, further comprising a throttle valve connectible between said source and said wheel brake in said third position.

Claim 7

The system defined in claim 5 further comprising a second fluid pressure source connectible to said brake in said third position of said valve means.

Claim 8

A motor vehicle nonskid brake system comprising: a fluid-operated wheel brake; valve means connected to said braKe; a brake-fluid reservoir connectible through said valve means to said brake; actuating means connectible through said valve means to said brake for actuating same, said actuating means having a driver-controlled plunger and a chamber receiving said plunger, said valve means having a first position connecting said chamber of said actuating means with said brake for permitting brake-fluid flow therebetween, and a second position blocking brake-fluid flow between said actuating means and said brake while permitting brake-fluid flow between said brake and said reservoir; a fluid-pressure source including a pressure accumulator maintained at an elevated fluid pressure independently of said actuating means and connected to said valve means for pressurization therethrough of said brake, said source being connected to said chamber at least upon operation of said plunger to actuate said brake and to render said plunger responsive to the presence of said source; and means responsive to motor-vehicle deceleration for controlling said valve means; said actuating means including a brake master cylinder for displacing brake fluid connected with said reservoir for drawing brake fluid therefrom, and operating means for actuating said master cylinder; said fluid-pressure source including a pump connected to said accumulator and drawing fluid from said reservoir for maintaining said source at said elevated fluid pressure, and a check valve between said pump and said accumulator for unidirectionally admitting fluid to said accumulator from said pump; said valve means including a three-position valve having a third position wherein said master cylinder is cut off and said accumulator is connected to said brake independently of said actuating means; and said means responsive to motor-vehicle deceleration including a servomotor connected to said valve means and control means coupled with said vehicle wheel associated with said wheel brake for operating said servomotor.

Claim 9

A motor vehicle nonskid brake system comprising: a fluid-operated wheel brake; valve means connected to said braKe; a brake-fluid reservoir connectible through said valve means to said brake; actuating means connectible through said valve means to said brake for actuating same, said actuating means having a driver-controlled plunger and a chamber receiving said plunger, said valve means having a first position connecting said chamber of said actuating means with said brake for permitting brake-fluid flow therebetween, and a second position blocking brake-fluid flow between said actuating means and said brake while permitting brake-fluid flow between said brake and said reservoir; a fluid-pressure source including a pressure accumulator maintained at an elevated fluid pressure independently of said actuating means and connected to said valve means for pressurization therethrough of said brake, said source being connected to said chamber at least upon operation of said plunger to actuate said brake and to render said plunger responsive to the presence of said source; and means responsive to motor-vehicle deceleration for controlling said valve means; said actuating means including a brake master cylinder for displacing brake fluid connected with said reservoir for drawing brake fluid therefrom, and operating means for actuating said master cylinder; said fluid-pressure source including a pump connected to said accumulator and drawing fluid from said reservoir for maintaining said source at said elevated fluid pressure, and a check valve between said pump and said accumulator for unidirectionally admitting fluid to said accumulator from said pump; said valve means including a three-position valve having a third position wherein said master cylinder is cut off and said accumulator is connected to said brake independently of said actuating means; and said means responsive to motor-vehicle deceleration including a servomotor connected to said valve means and control means coupled with said vehicle wheel associated with said wheel brake for operating said servomotor.

Claim 10

The brake system defined in claim 7 wherein said operating means includes a fluid-operated brake-pedal-controlled amplifier connected to said master cylinder.

Claim 11

The brake system defined in claim 8 wherein said amplifier is connected to said accumulator for operation with the pressure thereof.

Claim 12

The brake system defined in claim 8 wherein said amplifier is a vacuum-assist power cylinder.

Claim 13

The brake system defined in claim 7 wherein said accumulator and said pump form part of an auxiliary hydraulic system for said vehicle adapted to operate a load other than said brake system.