Safety braking device of vehicle

A vehicle brake system of a vehicle, the vehicle brake system comprising:

• an electronic control unit (ECU) configured to detect the condition of a vehicle and further configured to control braking of the vehicle;
• a brake pedal comprising a sensor transmitting a signal representing a pedal effort stroke to the ECU;
• a first motor-based braking unit comprising a motor configured to be driven by the control of the ECU, a screw shaft connected to the motor, and a pressing nut engaged with the screw shaft to press a pad toward a rear wheel disc, the first motor-based braking unit being installed to a vehicle to brake a rear wheel;
• a pedal-coupled ball-in-ramp (BIR) operating unit connected to a pedal simulator, an NSL nut engaged with an NSL screw shaft formed of an NSL (Non-Self Locking) type screw, the NSL screw being configured to pull a fixed cable when axially moving by load applied by the pedal simulator, and a solenoid configured to restrain the NSL nut such that the cable is not pulled, when not being turned off by the ECU;
• and
• a BIR-equipped braking unit comprising a second motor-based braking unit and a BIR unit, the BIR unit comprising balls disposed between an input ramp rotated by a hinge lever that the cable is fixed to and an output ramp facing the input ramp to convert rotation of the input ramp into axial movement of the output ramp, the BIR-equipped braking unit being installed to the vehicle to brake a front wheel and configured to operate at least part of the second motor-based braking unit to presses a pad toward a front wheel disc, using axial straight movement transmitted from the BIR unit.

A vehicle brake system of a vehicle, the vehicle brake system comprising:

• an electronic control unit (ECU) configured to detect the condition of a vehicle and further configured to control braking of the vehicle;
• a brake pedal comprising a sensor transmitting a signal representing a pedal effort stroke to the ECU;
• a first motor-based braking unit comprising a motor configured to be driven by the control of the ECU, a screw shaft connected to the motor, and a pressing nut engaged with the screw shaft to press a pad toward a front wheel disc, the first motor-based braking unit being installed to a vehicle to brake a front wheel;
• a pedal-coupled ball-in-ramp (BIR) operating unit connected to a pedal simulator, an NSL nut engaged with an NSL screw shaft formed of an NSL (Non-Self Locking) type screw, the NSL screw being configured to pull a fixed cable when axially moving by load applied by the pedal simulator, and a solenoid configured to restrain the NSL nut such that the cable is not pulled, when not being turned off by the ECU;
• and
• a BIR-equipped braking unit comprising a second motor-based braking unit and a BIR unit, the BIR unit comprising balls disposed between an input ramp rotated by a hinge lever that the cable is fixed to and an output ramp facing the input ramp to convert rotation of the input ramp into axial movement of the output ramp, the BIR-equipped braking unit being installed to the vehicle to brake a rear wheel and configured to operate at least part of the second motor-based braking unit to presses a pad toward a rear wheel disc, using axial movement transmitted from the BIR unit.