초록 ▼

A vehicle brake includes a compact module having an inlet port connected to the return-to-sump line of a hydraulic operating system on the vehicle. The module includes a path to a filter mounted on the module for filtering the operating system fluid and a poppet valve for bypassing a clogged filter.

A vehicle brake includes a compact module having an inlet port connected to the return-to-sump line of a hydraulic operating system on the vehicle. The module includes a path to a filter mounted on the module for filtering the operating system fluid and a poppet valve for bypassing a clogged filter. Passages in the module direct most of the return line fluid through a poppet valve which develops a source of back pressure substantially lower that system operating pressure in a cavity in the module and returns the fluid to an outlet connected to sump. A portion of the fluid in the cavity is communicated via a charge port in the module to a hydrostatic system to replenish leakage and shuttle flow in the hydrostatic system and to prevent cavitation. The source of back pressure in the module is selectively connected to spring-applied, pressure-released brakes through a four-way solenoid valve housed by the module. To release the brakes, the valve is actuated to direct pressure to one side of each of the brake cylinders. To apply the brakes, the valve is deactuated to pressurize the opposite sides of the cylinders for hydraulically assisted braking.

대표청구항 ▼

[ We claim:] [1.] In a brake system for a vehicle having hydraulically actuated brakes, a primary source of hydraulic fluid under pressure connected to a hydraulic actuator on the vehicle and having a return-to-sump line, a hydraulic system for actuating the brakes comprising:a pressure valve system

[ We claim:] [1.] In a brake system for a vehicle having hydraulically actuated brakes, a primary source of hydraulic fluid under pressure connected to a hydraulic actuator on the vehicle and having a return-to-sump line, a hydraulic system for actuating the brakes comprising:a pressure valve system connected to the return-to-sump line providing a source of back pressure from said line;a hydraulic brake actuator control connected to the pressure valve structure and to the hydraulically actuated brakes; andwherein the actuator control is selectively activatable to apply pressure to the brakes from the source of back pressure.