A coupling and control assembly includes first and second rotatable coupling members. The first coupling member has a first coupling face with locking formations, and the second coupling member has a second coupling face with pockets and in opposition with the first coupling face of the first coupling member and a third face spaced from the second coupling face and with passages communicating with the pockets. Locking members in the pockets transmit torque between the first and second coupling members. A stator includes an electromagnetic source, and a translator is translatable, rotatable, and coupled to the second coupling member to be rotatable therewith. The translator may include springs in the passages to actuate the plurality of locking members, or a permanent magnetic source cooperative with the electromagnetic source to translate the translator. An apertured retainer plate may be coupled to the second coupling member to facilitate pivoting of the plurality of locking members.

Provided is a braking device for a driving shaft, and the braking device includes: a brake ring coupled to the driving shaft in such a manner as to rotate according to rotation of the driving shaft and having one or more locking pieces with cross-shaped ends; a support frame fixed to an interior of a robot articulation; brake wings rotatable around brake shafts formed on the support frame and having locking protrusions adapted to stop the rotation of the driving shaft through physical interference with the cross-shaped ends of the locking pieces of the brake ring; position regulators adapted to rotate the brake wings to allow positions of the locking protrusions to be moved; and elastic members adapted to apply elastic forces to the brake wings rotating.

Disclosed are a parking actuator and an electromechanical brake including the same. The parking actuator, which is connected to a brake actuator that performs braking of a vehicle, includes a parking gear connected to the brake actuator to be rotatable together, a parking lever having one side hingedly fixed and the other side engaged with the parking gear, a parking motor provided to generate power, a power conversion unit including a spindle member rotating by receiving a rotational driving force of the parking motor and a nut member screwed to the spindle member to move forward or backward, and a pressing unit installed on the nut member to press the parking lever by the nut member moved forward or backward.

A motor-driven friction braking device for a rail vehicle is mainly composed of a torque motor, a speed reduction mechanism, an electromagnetic brake (1), a screw nut transmission mechanism and a brake friction pair (9). The torque motor, a screw (7), the speed reduction mechanism and the electromagnetic brake (1) are coaxially mounted; the torque motor is fixedly connected to the speed reduction mechanism, and the speed reduction mechanism is fixedly connected to the screw (7); the screw (7) is in non-self-locking threaded connection with a nut (8), and one end of the nut (8) is connected to the brake friction pair (9); and the electromagnetic brake (1) is mounted on the screw (7).

A piston configured for use in a brake system is disclosed. The piston can comprise: a body; and a footing; the footing positioned adjacent an end of the body, and having a recess that receives a central portion of the end; during operation of the brake system, the footing extends along a brake pad, and is configured to exert force on the brake pad during actuation of the disk brake system; and the footing having a face configured to contact the brake pad, the face having a length and a width, wherein the length is longer than an outside width of the body, and the length is greater than the width, and/or the face having a cross-sectional area normal to a direction of travel of the piston that is larger than a cross-sectional area of the piston body that is normal to the direction of travel of the piston.

A brake assembly includes a brake disc in rotational engagement with a wheel of a vehicle, a brake pad which frictionally engages the brake disc in a dynamic braking operation and a parking brake operation, a dynamic actuator adapted to bring the brake pad and brake disc into the frictional engagement in the dynamic braking operation, and a parking brake actuator associated with the dynamic actuator such that, in the parking brake operation, the frictional engagement of the brake disc and brake pad is maintained.

A brake assembly comprising: (a) a caliper including: (i) one or more pistons, (b) one or more rotary to linear actuators that provides an axial force to move the one or more pistons, (c) a motor gear unit in communication with the one or more rotary to linear actuators, the motor gear unit including: (i) a motor, and (ii) an electromagnetic brake that prevents movement of the motor gear unit, the pistons, or both when the motor is turned off so that the brake apply is maintained.

The electric-powered actuator includes a control device including: a motor angle estimation unit, and a reverse-input holding control section having a function of engaging an engaging part with an engaged part by controlling a solenoid to set the reverse-input holding mechanism into a reverse-input holding state while the electric-powered actuator is applying a load and a function of, from the reverse-input holding state, disengaging the engaging part from the engaged part to set the reverse-input holding mechanism into a reverse-input holding release state. The reverse-input holding control section includes an engagement intermediate control function section configured to control the estimated rotation angle such that the engaged part and the engaging part come into a predetermined positional relation within a certain period of time, when the engaging part is brought into engagement with the engaged part and when the engaging part is brought out of engagement with the engaged part.

An electromagnetic brake to restrict or prevent movement of a motor in a vehicle brake system, the electromagnetic brake includes: a core; a static plate; a moving plate located between the core and the static plate; a rotor located between the core and the moving plate; one or more legs that extend from the core; and one or more fasteners that connect the one or more legs to the static plate, the core includes a cylindrical portion and a flange that extends around the cylindrical portion, the one or more legs extend from the flange radially around the cylindrical portion.

A hydraulic apparatus is disclosed, which includes a hydraulic cylinder body, a piston, a push assembly, and a first sealing component; the hydraulic cylinder body is of a hollow cylinder shape, provided with a first opening and a second opening respectively at two ends; the piston is disposed in the hydraulic cylinder body and is located at the first opening; the first sealing component covers the second opening; the hydraulic cylinder body, the piston, and the first sealing component are configured to form a hydraulic chamber; the hydraulic cylinder body is provided with a liquid flow opening which is located between the first sealing component and the piston; and the piston is configured to be enabled to move in the hydraulic cylinder body, driven by the push assembly.