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.

This helically toothed belt power transmitting device (1) has: a toothed belt (10) having a plurality of teeth (12) tilted relative to the width direction of the belt; a drive pulley; and a driven pulley. The width of the helically toothed belt (10) is 1 mm to 20 mm, inclusive. The core (13) of the toothed belt (10) is a twisted cord containing high-strength glass fibers or carbon fibers and has a diameter of 0.2 mm to 0.9 mm, inclusive. The compressibility of the teeth (12) of the toothed belt (10) compressed by the grooves of the drive pulley and the driven pulley is 0% to 5%, inclusive.

A brake device, configured to be installed directly on a driving axle or through a hub, wherein said device includes a first brake disc joined to the axle sharing rotary motion, a first container disc and a second container disc configured to be moved in the axial direction of said axle. The container discs are positioned on each side of the brake disc, such that both are configured to be moved in the axial direction towards the linings of the first brake disc and to exert a pushing pressure thereon, producing the braking of the brake disc and, therefore, of the driving axle whereon it is assembled. Furthermore, the container discs comprise an inner circuit configured to accommodate the passage of a coolant configured to cool them.

The present invention relates to a system, comprising a transmission unit being arranged for converting a rotational motion into a translational motion, the transmission unit including an input and an output, wherein the input is configured to receive torque from a motor and the output is configured to provide a brake force for pressing a brake pad against a friction surface; a housing defining a hydraulic pressure chamber, wherein the housing at least partially encompasses the transmission unit; and an axially movable piston arranged in the housing and coupled to the transmission unit such that a translational motion of the piston causes a translational motion of the transmission unit for providing the brake force in a hydraulic operation mode.

Provided is an electro-mechanical brake system and a method of operating the same including: a pair of pad plates disposed on both sides of a disk rotating together with a wheel; a piston configured to allow the pad plates to come in close contact with or to be separated from the disk; a first motor and a second motor configured to operate independently from each other and provide the piston with power; a first gear configured to decelerate power of the first motor and transmit the decelerated power; a second gear configured to convert power of the second motor into a translational motion and apply pressure to or release pressure on the piston while in contact with the piston, the second gear including a guide part slantly formed on a portion that comes in contact with the piston; and a connecting part connecting the first gear and the second gear to each other to allow the first gear and the second gear to rotate together with each other, the connecting part configured to couple the first gear and the second gear such that the second gear is slidable with respect to the first gear.

A ball screw assembly having a ball screw nut including an outer surface, an inner surface defining a central bore, and a ball track defined by the inner surface, a ball screw shaft including an outer surface defining a ball track, the ball screw shaft being disposed in the central bore so that the two ball tracks form a ball raceway, a first stopper disposed at a first end of the ball screw nut within the ball raceway, a plurality of main balls forming a ball train disposed in the ball raceway, a main spring assembly disposed in the ball raceway between a first end of the ball train and the first stopper, and a strain sensing element affixed to a flat surface portion defined by the outer surface of the ball screw nut.

A brake actuator comprising a DC motor, a computer configured for: measuring, over time, a current drawn by the motor and a voltage between the terminals of the motor; implementing a Kalman filter in order to compute, from the measured current and voltage, a filtered current drawn by the motor and a filtered rotational speed of a shaft of the motor; computing, from the value of the filtered current and the value of the filtered rotational speed, a clamping force that is produced by the actuator; controlling the motor such that it stops when the computed value of the clamping force reaches a predetermined setpoint value.

An electric brake device installed on a vehicle, including: a rotary body to rotate with a wheel; a friction member to be pushed onto the rotary body; an actuator including an electric motor as a drive source to cause the friction member to be pushed onto the rotary body; and a controller to control a braking force generated by the electric brake device by controlling a supply current supplied to the electric motor, wherein the controller determines, by mutually different methods, a plurality of target supply current components each of which is a component of a target supply current as a target of the supply current, determines the target supply current by adding up the target supply current components, and changes contribution degrees of the respective target supply current components in the determination of the target supply current in accordance with a characteristic of the braking force to be generated.

The present disclosure relates to an actuator for an electronic parking brake and, more particularly, to an actuator for an electronic parking brake, whereby a motor may be stably fixed using a simple structure. To this end, an actuator for an electronic parking brake according to the present disclosure comprises: a motor having a bracket to fix a position of a motor housing; a main housing in which the motor is accommodated; and a main cover seated on an upper end of the main housing, wherein a first fastening protrusion extending downward to be inserted into a first fastening groove formed in the motor housing and a second fastening protrusion extending outward in the radial direction to be inserted into a second fastening groove formed in the main housing are formed on the bracket, and when the motor is assembled, the second fastening groove supports the second fastening protrusion to prevent the axial direction movement of the second fastening protrusion.

A parking mechanism that includes a wheel disc, a wedge disc, and a drive assembly. An axis of the wheel disc and an axis of the wedge disc both are aligned with an axis of a motor shaft. A wedge groove with an opening facing the wheel disc is formed on a surface of the wedge disc facing the wheel disc, and a movable part in contact with the wheel disc is disposed in the wedge groove. In a direction from a bottom of the wedge groove to the wheel disc, a groove depth at a first end of the wedge groove is greater than a size of the movable part, and a groove depth at a second end of the wedge groove is less than the size of the movable part. The parking mechanism can provide stepless variable parking force.