Patent ID: 8196714

Claim:
A single motor electronic wedge brake system generating solenoid assisting force, comprising: an ECU that receives vehicle information signals; and a plurality of wedge actuator assemblies, wherein each wedge actuator assembly comprises: a wedge structure, having a wedge roller, a wedge moving plate, and a wedge base plate, the wedge structure being self-energizing by using the wedge roller when inner and outer pads of a wedge caliper are pressed against a wheel disk by using power generated from a motor, the motor being driven by an electronic pedal used to brake a vehicle and the ECU, the wedge roller implementing a wedge operation between the wedge moving plate, which moves the inner pad to the wheel disk, and the wedge base plate provided on a side opposite to the wedge moving plate, by using an axial linear motion converted from torque of the motor controlled by the ECU, wherein opposing surfaces of the wedge moving plate and the wedge base plate are both V-shaped, and wherein the wedge roller is configured to move from a central portion of the V-shaped opposing surfaces to an outside of the V-shaped opposing surfaces; a NSL (Non-Self Locking) push rod shaft that supports an axial reaction force transmitted from the inner and outer pads during operation, the push rod shaft having first and second ends; a solenoid that is controlled by the ECU so as to constrain or release the push rod shaft; a solenoid mechanism that includes the push rod shaft, which is positioned at the base plate and has NSL threads screwed to a supporting nut having NSL threads together with a push rod shaft spring in order to support an axial reaction force transmitted from the inner and outer pads, and a switching lever, configured to engage or separate from a latch of the push rod shaft in order to constrain or release an axial movement of the push rod shaft as the solenoid is controlled by the ECU; a friction generating assembly that is provided at the first end of the push rod shaft, moves together with the push rod shaft moving in an axial direction so that an axial reaction force transmitted from the inner and outer pads is dispersed by the push rod shaft, and generates a frictional force for supporting an axial reaction force by using the push rod shaft when the axial reaction force transmitted from the inner and outer pads to the wedge base plate is applied to the friction generating assembly, and the wedge structure is provided at a periphery of the friction generating assembly and at the first end of the push rod shaft; and an EPB (Electric Parking Brake) spring that presses and constrains the push rod shaft of an adjusting unit to maintain a braking performance during operation of an electric parking brake.