Abstract: A brake actuator includes: a housing; an electric motor with a hollow motor shaft rotating; a rotating shaft disposed inside the motor shaft to be coaxial therewith; a piston with a rear end disposed inside the motor shaft and a front end engaged with the friction member; a speed reduction mechanism decelerating rotation transmitted from the motor shaft and transmitting the rotation to the rotating shaft; and a motion conversion mechanism converting a rotating motion of the rotating shaft into an advancing/retracting motion of the piston. The motor shaft is rotatably supported by the housing at an outer peripheral surface thereof, and the rotating shaft is rotatably supported by an inner peripheral surface of the motor shaft via rollers at an outer peripheral surface thereof as well as by the housing via a thrust bearing at a rear end of the rotating shaft.

Abstract: A brake device may include: a brake piston configured to press a braking member against a brake member rotating with a wheel; a hydraulic system configured to press the brake piston toward the brake member; an electric-powered system comprising a movable element configured to press the brake piston toward the brake member; and a controller configured to execute a parking brake operation by using the hydraulic system and the electric-powered system. In the parking brake operation, the controller may be configured to apply a pressing force of a predetermined value or greater to the brake piston by using both the hydraulic system and the electric-powered system. The predetermined value may be greater than a maximum pressing force that the electric powered system is capable of applying to the brake piston.

Abstract: In an assembly comprising a brake master cylinder unit and a dash panel of a vehicle disclosed herein, the electric motor may be fixed to a body of the brake master cylinder unit such that a rotation axis of the electric motor extends along a vehicle-width direction. By fixing the electric motor such that the rotation axis extends along the vehicle-width direction, an overall height of the cylinder unit may be lowered. A position where the pushrod is fixed to the cylinder unit can be lowered, and a position of a pivot of the brake pedal (a connection point between the brake pedal and the dash panel) can also be lowered. As a result, the brake pedal (a pedal arm) can be shortened and weight(s) of part(s) related to the cylinder unit (the pedal arm) can be reduced.

Abstract: A brake actuator includes: a housing; an electric motor with a hollow motor shaft rotating; a rotating shaft disposed inside the motor shaft to be coaxial therewith; a piston with a rear end disposed inside the motor shaft and a front end engaged with the friction member; a speed reduction mechanism decelerating rotation transmitted from the motor shaft and transmitting the rotation to the rotating shaft; and a motion conversion mechanism converting a rotating motion of the rotating shaft into an advancing/retracting motion of the piston. The motor shaft is rotatably supported by the housing at an outer peripheral surface thereof, and the rotating shaft is rotatably supported by an inner peripheral surface of the motor shaft via rollers at an outer peripheral surface thereof as well as by the housing via a thrust bearing at a rear end of the rotating shaft.

Abstract: An electric brake caliper, including: a caliper main body; brake pads; and an actuator including a piston, an electric motor of a rotary type, and a motion converting mechanism, wherein the motion converting mechanism includes a hollow output sleeve configured to be linearly moved to move the piston disposed at one end of the output sleeve nearer to the one of the brake pads and an input shaft disposed in the output sleeve and configured to be rotated by the electric motor, the motion converting mechanism being configured to convert rotation of the input shaft into a linear movement of the output sleeve, wherein the electric motor includes a hollow driving rotary shaft, and wherein the motion converting mechanism is disposed in the driving rotary shaft, and the input shaft includes a flange whose outer circumferential end is in mesh with an inner circumferential portion of the driving rotary shaft.

Abstract: An electric brake caliper, including: a caliper main body; brake pads; and an actuator including a piston, an electric motor of a rotary type, and a motion converting mechanism, wherein the motion converting mechanism includes a hollow output sleeve configured to be linearly moved to move the piston disposed at one end of the output sleeve nearer to the one of the brake pads and an input shaft disposed in the output sleeve and configured to be rotated by the electric motor, the motion converting mechanism being configured to convert rotation of the input shaft into a linear movement of the output sleeve, wherein the electric motor includes a hollow driving rotary shaft, and wherein the motion converting mechanism is disposed in the driving rotary shaft, and the input shaft includes a flange whose outer circumferential end is in mesh with an inner circumferential portion of the driving rotary shaft.