초록 ▼

A vehicle braking system is provided having alternate, automatically selected actuating fluid circuits, either hydraulic or air circuits, interconnected between a master brake cylinder actuated by a vehicle operator and a brake actuating cylinder that operates the brake shoes at a wheel of the vehic

A vehicle braking system is provided having alternate, automatically selected actuating fluid circuits, either hydraulic or air circuits, interconnected between a master brake cylinder actuated by a vehicle operator and a brake actuating cylinder that operates the brake shoes at a wheel of the vehicle. A first actuating fluid circuit is normally connected in communicating relationship between the master cylinder and actuating cylinders by fluid-pressure responsive valves. Failure in buildup of fluid pressure in the first circuit when the master cylinder is actuated, such as would be due to a break or leak in the primary actuating fluid line, results in automatic operation of the valves to interconnect a second circuit in bypass relationship to the first circuit. The pressure responsive valves are not operational unless the brake master cylinder is being actuated. Once the valves have been actuated due to a failure in the first circuit, these valves remain in the position where the second circuit remains interconnected and the vehicle may continue to be operated with a fully operational fluid brake system. A modified form of the system is adaptable to accommodating a brake lockup mechanism in the automatically responsive system.

대표청구항 ▼

A vehicle braking system comprising a brake actuating cylinder at a wheel of the vehicle, said cylinder actuable through application of pressurized fluid thereto to operate a brake mechanism of the wheel, a master brake cylinder including a piston having a brake pedal connected thereto and selective

A vehicle braking system comprising a brake actuating cylinder at a wheel of the vehicle, said cylinder actuable through application of pressurized fluid thereto to operate a brake mechanism of the wheel, a master brake cylinder including a piston having a brake pedal connected thereto and selectively operable within said Master brake cylinder to effect application of pressurized fluid in the brake system, a first fluid circuit connected between said master cylinder and said brake actuating cylinder, a second fluid circuit connected between said master cylinder and said brake actuating cylinder, and a solenoid operated valve interconnected in said first and second circuits and normally in a first position connecting said first circuit in fluid communicating relationship between said master cylinder and brake actuating cylinder, a fluid pressure responsive switch operative independently of displacement of said brake pedal to any predetermined position and responsive to fluid pressure in said first circuit, a fluid pressure responsive circuit connected to said fluid responsive switch and interconnected with said solenoid operated valve to operate said valve to a second position when said master cylinder piston is displaced to alternatively connect said second circuit in fluid communicating relationship between said master cylinder and brake actuating cylinder when fluid pressure in said first circuit does not increase to at least a predetermined minimum value.