Disclosed herein an electric parking brake. The electric parking brake according to an embodiment of the disclosure includes a power transmission unit that receives a rotational force from an actuator that generates a driving force for implementing a parking braking force and converts the rotational force into a linear motion to press or release a pair of brake shoes disposed on both sides of an inside of a drum, respectively, wherein the power transmission unit includes a pressing piston configured to press the pair of brake shoes, a driving cylinder configured to guide the pressing piston, and a dust cover installed between the pressing piston and the driving cylinder, the dust cove formed to be deformable according to an operation of the pressing piston, wherein the dust cover is configured to maintain internal airtightness of the power transmission unit and prevent foreign substances from entering.

An electronic parking brake device may include: a plate part having a brake shoe rotatably mounted thereon; a housing part mounted on the plate part and configured to guide hydraulic pressure; a motor part mounted on the housing part, and driven when power is applied thereto; a piston part mounted on the housing part, and moved by hydraulic pressure so as to operate the brake shoe; and an operating part embedded in the housing part, and driven by the motor part so as to move the piston part.

Provided in a device for activating a wheel brake of a vehicle, having a tensioning installation which has a spindle drive, are two electric motors, the first electric motor by way of a first gear mechanism acting bi-directionally on the spindle drive. In order for the position of the tensioning installation, once attained, to be fixed in a parking brake, a second electric motor by way of a second gear mechanism, which has a self-locking worm gear mechanism and by way of at least one releasable coupling that acts uni-directionally in the activating direction, is coupled to the spindle drive. The coupling is composed of a cam on an output shaft of the first gear mechanism, and a pin on an output element of the worm gear mechanism. Since the cam cannot be reversed beyond the pin, a latching position of the tensioning installation is defined in this way.

A drum brake apparatus includes: a housing; a main braking unit disposed on a first portion of the housing, and the main braking unit configured to be, during main braking, driven by a hydraulic pressure and pressing a shoe; a parking braking unit disposed on a second portion of the housing, the parking braking unit configured to be, during parking braking, driven by an electromotive force of an actuator and pressing the shoe; a first locking member configured to couple the housing to one surface of a back plate; and a second locking member configured to couple the actuator to the housing on another surface side of the back plate.

A brake assembly including a first brake piston; a second brake piston; and a parking brake assembly. The parking brake assembly includes a power transfer mechanism and a motor providing power to the power transfer mechanism. During a parking brake apply, the power transfer mechanism provides the power to both the first brake piston and the second brake piston so that both the first brake piston and the second brake piston are moved until a resistance of the second brake piston becomes higher than a resistance of the first brake piston. The power transfer mechanism then transfers the power from the second brake piston to the first brake piston so that the second brake piston ceases to move and additional power is supplied to the first brake piston.

A drum brake assembly includes a brake spider having a central aperture configured to receive an axle extending therethrough and first and second brake shoes. Each of the first and second brakes shoes has a first end pivotally coupled to the brake spider. First and second cam followers are disposed at corresponding second ends of the first and second brake shoes. A camshaft has a shaft extending through a camshaft aperture in the brake spider and disposed along a rotational axis and a cam disposed at a first end of the shaft and in engagement with the first and second cam followers. An electric motor has an output shaft coupled to the camshaft. A controller is configured to drive the electric motor to cause rotation of the camshaft and move the first and second brake shoes between positions of engagement and disengagement with an associated braking surface.

The invention relates to a motor vehicle actuator, in particular a brake actuator, comprising a housing (3) which consists of a housing container (1) and a housing cover (2) designed as a base support, and in which an electric motor (4) and a transmission (6) coupled to the electric motor via a torque transmitting device (5) are arranged. A retaining frame which can be arranged on the housing cover (2) is provided in order to arrange the electric motor (4) within the housing (3). The invention is characterized in that the holding frame (7) is designed as a damping and/or spring device.

A reduction motor for a parking brake mechanical actuator of a drum brake comprising an electric motor and a reduction gearbox, in which the electric motor comprises an output shaft extending along a first axis, the reduction gearbox comprises an output shaft extending along a second axis, and in which the reduction motor also comprises at least one angle gear between the electric motor and the reduction gearbox or at the output of the reduction gearbox, the angle gear comprising a crown gear-pair comprising a pinion and a crown gear, the pinion being engaged with the output shaft of the electric motor and meshing with the crown gear which is a part of the reduction gearbox.

An electric disc brake is disclosed. An electric disc brake comprises a caliper housing configured to include a cylinder at which a piston is installed to be reciprocally movable by a brake hydraulic pressure, an adjuster arranged inside the piston, a pushrod provided inside the cylinder, an actuator configured to decelerate a rotational force according to an activation of a motor to output the decelerated rotational force through an output gear so as to pressurize the piston, and a ramp unit installed inside the cylinder and configured to receive the decelerated rotational force from the actuator to pressurize the pushrod to the piston so as to prevent rotation of the pushrod.

An electric brake device includes a brake rotor, a brake pad, an electric motor, a linear motion mechanism, and a controller. The controller includes a motor angular velocity control section to control an angular velocity of the electric motor; and a motor angular velocity limiting section to limit the angular velocity of the electric motor such that an angular velocity ωb of the electric motor in a no-load state when the electric brake device shifts from a non-braking state to a braking state, and an angular velocity ωr of the electric motor in a no-load state when the electric brake device shifts from the braking state to the non-braking state satisfy |ωb|>|ωr|.