The invention proposes a planet carrier (50) for a planetary gear train of a reducing mechanism of an electromechanical actuator for actuating a parking brake of a motor vehicle, which carries planet pinions (52), each of which is accommodated between two parallel support plates (56, 58) belonging to a reinforcement (54) of the planet carrier and each of which is mounted in rotation on the planet carrier (50) about a rotation guide pin (74) that is mounted between the two support plates (56, 58) to which it is linked by the two opposing axial ends thereof, characterized in that each rotation guide pin (74) is a tubular pin.

Disclosed is an electronic parking brake system, which is configured to push first and second brake shoes respectively disposed on inner opposite sides of a drum to an inner surface of the drum for braking, including an actuator including a motor configured to rotate forward and reverse to generate a driving force for braking, and a reduction gear unit configured to amplify the driving force transmitted from the motor, and a power converter configured to convert a rotational motion from the actuator into a linear motion to press or release the first and second brake shoes.

A drum brake apparatus includes a housing; a main braking unit installed on one part of the housing, and driven by a hydraulic pressure and pressing a shoe, during main braking; and a parking braking unit installed on the other part of the housing, and driven by an electromotive force of an actuator and pressing the shoe, during parking braking, the parking braking unit includes a bevel gear section disposed in the housing while having a structure of a bevel gear, and rotated in association with the actuator; and a rod section connected with the bevel gear section, and moved out of the housing in association with the bevel gear section and pressing the shoe.

An actuator of an electric parking brake is disclosed. According to one embodiment of the present invention, an actuator of an electric parking brake is provided, the actuator including a driving part which generates a rotation force, a first gear part which transmits the rotation force of the driving part, a second gear part including a rotation shaft which receives the rotation force from the first gear part to rotate, and a rotation shaft control part which is disposed at one side of the second gear part on the rotation shaft, provides a degree of rotational freedom to the rotation shaft during braking, and prevents reverse rotation of the second gear part due to a reverse rotation torque by fixing the rotation shaft when the braking is completed.

An actuator of an electric parking brake is disclosed. An actuator of an electric parking brake according to one embodiment of the present invention includes a driving unit which outputs a rotational force through a driving shaft, a first gear unit which receives the rotational force from the driving unit, a second gear unit including a rotation shaft which receives the rotational force from the first gear unit to rotate, and a driving shaft control unit which is disposed on the driving shaft, provides a degree of rotational freedom to the driving shaft during braking, and fixes the driving shaft to prevent reverse rotation of the driving shaft due to a reverse rotation torque when the braking is ended.

This disclosure relates to a magnetorheological (MR) brake. The MR brake includes a rotor constructed at least partially of a ferromagnetic material, and a housing that supports the rotor such that the rotor and the housing are rotatable relative to each other about an axis, wherein the housing and rotor are configured such that a fluid gap is defined between the housing and the rotor, and wherein portions of the housing adjacent the rotor are constructed at least partially of a ferromagnetic material. An MR fluid is disposed in the fluid gap. A current-carrying coil is excitable to generate a magnetic field within ferromagnetic portions of the rotor and the housing and acts on the MR fluid. At least one element constructed of a material having low magnetic permeability is configured route the lines of magnetic flux through surrounding higher permeability material on opposite sides of the fluid gap.

This disclosure relates to a magnetorheological (MR) brake. The MR brake includes a rotor constructed at least partially of a ferromagnetic material, and a housing that supports the rotor such that the rotor and the housing are rotatable relative to each other about an axis, wherein the housing and rotor are configured such that a fluid gap is defined between the housing and the rotor, and wherein portions of the housing adjacent the rotor are constructed at least partially of a ferromagnetic material. An MR fluid is disposed in the fluid gap. A current-carrying coil is excitable to generate a magnetic field within ferromagnetic portions of the rotor and the housing and acts on the MR fluid. At least one element constructed of a material having low magnetic permeability is configured route the lines of magnetic flux through surrounding higher permeability material on opposite sides of the fluid gap.

An actuator for a vehicle brake includes a first worm shaft connected to a motor and disposed within a housing, a first worm wheel disposed within the housing, engaged with the first worm shaft, and rotated in conjunction with the rotation of the first worm shaft, a second worm shaft including a second worm shaft body disposed within the housing and connected to the first worm wheel and a plurality of second worm shaft gear teeth disposed on the outer circumference of the second worm shaft body in a way to be spaced apart from each other, and a second worm wheel engaged with the second worm shaft and configured to deliver electric power to a piston part that pressurizes or releases a brake.

This motor device is provided with, e.g.: a motor having a motor case and a shaft supported by the motor case so as to be capable of rotating about a rotation center; a housing in which the motor is housed; and an elastic member interposed between the motor case and the housing. A first concave part in communication with both sides of the elastic member in the axial direction is provided between the outer peripheral surface of the elastic member and a cylindrical surface of the housing.

Disclosed herein an actuator for a brake device includes a housing including a motor accommodating portion configured to accommodate a motor, and a gear accommodating portion configured to accommodate a reduction device; a power connection unit connected to the motor; and the reduction device connected to the power connection unit; wherein the reduction device includes a first reduction gear unit connected to the power connection unit and a second reduction gear unit connected to the first reduction gear unit, and the first reduction gear unit is provided as a bevel gear assembly.