초록 ▼

A brake unit comprising a hydraulic booster unit connected to hydraulic auxiliary energy and controllable by a brake pedal via a control piston drives a master brake cylinder unit to supply brake pressure to wheel brake cylinders through at least one hydraulic line connected to an output of the mast

A brake unit comprising a hydraulic booster unit connected to hydraulic auxiliary energy and controllable by a brake pedal via a control piston drives a master brake cylinder unit to supply brake pressure to wheel brake cylinders through at least one hydraulic line connected to an output of the master brake cylinder unit. A bypass line connected to the work chamber of the booster unit supplies a preliminary feed of the auxiliary energy to the wheel brake cylinders to overcome the brake clearance. A two way, two position changeover valve is connected to the hydraulic line, the bypass line and the wheel brake cylinders to connect during a braking operation either the bypass line or the hydraulic line to the wheel brake cylinders dependent on the pressure in the two lines. This brake unit requires only a few hydraulic connections external of the unit, has a single construction, has small dimensions, has exact operation and has quick response.

대표청구항 ▼

A brake unit to generate a braking pressure in a vehicular brake system comprising: a hydraulic booster unit connected to an auxiliary hydraulic boosting fluid source, said booster unit being controllable by a brake pedal via a control piston for driving a master brake cylinder unit to supply said b

A brake unit to generate a braking pressure in a vehicular brake system comprising: a hydraulic booster unit connected to an auxiliary hydraulic boosting fluid source, said booster unit being controllable by a brake pedal via a control piston for driving a master brake cylinder unit to supply said braking pressure to wheel brake cylinders through at least one hydraulic line connected to an outlet of said master cylinder unit; a bypass line connected to a boosting chamber of said booster unit subjected to auxiliary boosting fluid from said source upon actuation of said brake pedal to provide a preliminary feed of said boosting fluid to said wheel brake cylinders to overcome brake clearance; and a changeover valve directly connected to said wheel brake cylinders, said hydraulic line and said bypass line responsive to said braking pressure and the pressure of said boosting fluid to connect said bypass line to and disconnect said hydraulic line from said wheel brake cylinders during said preliminary feed and to connect said hydraulic line to and disconnect said bypass line from said wheel brake cylinders after said brake clearance is overcome.