ELECTRIC BOOSTER TYPE BRAKE DEVICE REINFORCING A FAIL-SAFE FUNCTION WHILE REDUCING THE QUANTITY OF VALVES CONTROLLING THE HYDRAULIC FLOW

摘要

PURPOSE: An electric booster type brake device reinforces a fail-safe function by maintaining the hydraulic flow into a wheel during the fail, and enhances the cost competitiveness through forming the hydraulic flow line for minimizing the number of solenoid valves for an embodying fail-safe function.;CONSTITUTION: An electric booster type brake device comprises a first solenoid valve(21), a second solenoid valve(22), and a third solenoid valve(23). The first solenoid valve is only installed in a second hydraulic line(8) of a pair of hydraulic lines of the first master cylinder(5). The second solenoid valve is installed in a pedal force line(9). The pedal force line is leaded to a pedal simulator(30) from a second master cylinder(6). The third solenoid is installed in a branch line(10). The branch line divaricates from the pedal force line in the front part of the second solenoid valve and is connected to the second hydraulic line from the rear part of the first solenoid valve.;COPYRIGHT KIPO 2012