Disclosed herein an electric parking brake (EPB) system including a motor actuator operated by an electric motor includes a motor driving circuit configured to drive the electric motor; a current sensor detecting a current flowing through the electric motor; a voltage sensor detecting a voltage input to the electric motor; and a controller configured to determine a total energy consumption based on the current and voltage of the electric motor during a parking operation, determine whether a target current of a parking operation mode needs to be changed in response to the determined total energy consumption, in response to determining that the target current needs to be changed, change the target current based on at least one of a period of use and the number of times of operation of the EPB system, and control the electric motor in response to the changed target current.

An electromechanical brake actuator (102, 202, 302, 402) for a brake has a cam disc (108, 108, 108, 208, 308, 408) and a brake plunger (114, 214, 314) for actuating a brake lever (358). The cam disc (108, 108, 108, 208, 308, 408) and the brake plunger (114, 214, 314) have contact surfaces in contact with one another for directly transmitting a drive torque. The contact surface of the cam disc (108, 108, 108, 208, 308, 408) extends at a distance r about the pivot point D, which is defined as a function r() with a change rate r() and depends on the angular position of the cam disc (108, 108, 108, 208, 308, 408). The contact surface is configured to effect non-linear transmission between the drive torque of the cam disc (108, 108, 108, 208, 308, 408) and the force transmitted to the brake plunger (114, 214, 314).

Disclosed is an actuator for a parking brake. In accordance with an aspect of the disclosure an actuator for a parking brake includes a motor generating power; a reduction gear portion including a driving gear rotating in association with a drive shaft of the motor, and a sun gear coupled to the drive gear to rotate together; a housing in which the motor and the reduction gear portion are accommodated; and a locking portion configured to limit rotation of the reduction gear portion; wherein the locking portion is further configured to a pair of locking members configured to restrain and release at least a part of a rotation shaft of the sun gear, a plurality of elastic members supporting each of the locking members in a direction of the rotation shaft of the sun gear, an electromagnet member configured to separate the pair of locking members from the sun gear by generating an electromagnetic force when the power is applied.

Disclosed is an actuator for a parking brake. In accordance with an aspect of the disclosure an actuator for a parking brake includes a motor generating power; a reduction gear portion configured to transmit the power of the motor to a parking portion implementing the parking braking of a vehicle; a locking portion configured to limit rotation of the reduction gear portion; and a housing in which the motor, the reduction gear portion, and the locking portion are accommodated; wherein the locking portion is configured to a lock gear coupled to the reduction gear portion to rotate together, a lever provided to be engaged with the lock gear through a hinge motion, an elastic member elastically supporting the lever toward the lock gear, and an electromagnet member that generates electromagnetic force when the power is applied to separate the lever from the lock gear.

Provided is motor-driven drum brake system including: a motor-driven drum brake including a brake shoe inside a drum and allowing the brake shoe to be pressed on an inner surface of the drum by hydraulic pressure of a wheel cylinder or an operation of a motor to perform braking; and a controller configured to control the motor to engage the motor-driven drum brake, wherein the controller is configured to, upon a total count of parking apply operations of the motor-driven drum brake being greater than a preset count when performing a parking apply operation, correct a target clamping force of the motor-driven drum brake and perform the parking apply operation according to the corrected target clamping force.

Disclosed herein is a brake apparatus that may include a rotating member, a friction member that applies a frictional force to the rotating member, a motor that moves the friction member, and a controller that controls operation of the motor. The controller may determine a reference position based on a position of the friction member at a time point at which the friction member is no more in contact with the rotating member when the brake is released and control movement of the friction member from the reference position to adjust a distance between the friction member and the rotating member based on an estimated temperature of the rotating member when the brake is released.

A method and a system for monitoring wear of a braking frictional pad of a motor vehicle, the motor vehicle including a brake device acting on a vehicle wheel, the brake device including a braking frictional pad that is non-rotatable relative to the vehicle wheel and is linearly movable parallel to a rotational axis of the vehicle wheel; a brake piston configured to drive the braking frictional pad; and an electric parking brake or an electric mechanical brake, the electric parking brake or the electric mechanical brake having a drive motor and a piston driving part driven by the drive motor to be linearly movable, the piston driving part being configured to, when the motor vehicle is braking, drive the brake piston to contact the braking frictional pad and in turn drive the braking frictional pad to move.

Disclosed is an actuator for a brake device. In accordance with an aspect of the disclosure an actuator for a brake device includes a motor; a first reduction gear unit connected to the motor; and a second reduction gear unit connected to the first reduction gear unit; wherein the first reduction gear unit is provided as a planetary gear assembly, and the second reduction gear unit is provided as a bevel gear assembly.

A brake system for an air vehicle having more than one wheel is described. The system has at least one rotating structure provided on the aircraft o as to be concentric with the wheel and to perform rotational movement together with the wheel, a friction element, contacting and compressing the rotating structure so as to generate a brake force to slow down the air vehicle, at least one actuator triggered by an electric motor to actuate the friction element so that it moves closer to and/or away from the rotating structure, a control unit enabling to control the amount of current given to the electric motor, more than one brake level changing in dependence to the amount of current given to the electric motor and expressing the magnitude of brake force applied to the air vehicle, through which the rotating structure and friction element contact each other.

An electromechanical brake system has a brake actuator with a power transmission for transmitting an actuating force to a brake pad. The power transmission includes a rotatable shaft, a coupler with a locking element, wherein the coupler can be controlled so that the locking element is engaged with the rotatable shaft and blocks its rotation or so that the locking element is disengaged from the rotatable shaft so that the rotatable shaft can be rotated. The brake system has a first receptacle into which a first tool can be inserted so that it engages with the rotatable shaft and transmits a rotation on the rotatable shaft.