Provided is an electric braking device wherein a friction member is pressed, via a piston driven by an electric motor, against a rotary member that rotates integrally with a vehicle wheel, thus generating a braking force on the vehicle wheel. The electric braking device is provided with: a controller for controlling the electric motor; a rotation angle sensor for detecting a rotation angle of the electric motor; and a return mechanism for applying a return force to a piston in a direction away from the rotary member. Furthermore, the controller executes a proper/improper determination to determine whether the return mechanism is operating properly on the basis of a change in the rotation angle after conduction of electricity to the electric motor is stopped.

An electric brake actuator configured to push a friction member onto a rotary body by advancing a piston by rotating an input shaft by an electric motor, including: a torque imparting device configured to impart, to an input shaft, a torque in a direction to retract a piston based on an elastic torque of a torsion spring and including a mechanism configured to allow a first retained portion provided at one end portion of the torsion spring to be retained by another one of a plurality of first retaining portions of a stator when the elastic torque exceeds a set upper-limit torque to decrease the elastic torque; and a mechanism configured to permit a second retained portion of a rotor to be retained by a second retaining portion provided at the other end portion of the spring to prohibit the elastic torque from becoming smaller than a set lower-limit torque.

A brake actuation assembly comprising a thrust and support element comprising a first thrust end adapted to cooperate with a first jaw of a brake; the thrust and support element comprising a second thrust and support element end; a lever rotatably supported to the thrust and support element for rotating at least along a rotation thrust direction; the lever comprising a first lever end adapted to cooperate with a second jaw of the brake; the lever comprising a second lever end, wherein the second lever end comprises a hooking seat; and wherein the hooking seat is adapted to firmly receive a connecting portion of a coupling end of a traction cable, the traction cable having a cable body capable of an elastic flexural deformation; the hooking seat being arranged undercut with respect to the rectilinear development direction of the cable body; the lever being adapted to oscillate; wherein the lever comprises a lever abutment surface which cooperates with a stop abutment counter-surface provided in the thrust and support element to prevent a free rotation of the lever in the opposite direction to the rotation thrust direction; the thrust and support element and the second lever end delimiting a guide channel which allows the passage of at least the coupling end; the guide channel allowing the coupling end to rotate about the second lever end and to be coupled to the hooking seat upon the elastic return of the cable body to a substantially straight cable body position, preventing the rotation of the lever in the opposite direction to the rotation thrust direction.

A brake actuator is disclosed having a transfer element configured to be moved along an actuating direction and to actuate a brake by moving into at least one actuating position; an actuating mechanism configured to move the transfer element into the at least one actuating position to actuate the brake, wherein the actuating mechanism is configured to be movable along the actuating direction; and a distancing mechanism configured to move the actuating mechanism from a non-operating position into an operating position along the actuating direction. The transfer element and the actuating mechanism are configured such that the transfer element is located in the actuating position when the actuating mechanism is located in the non-operating position.

A power delivery device configured for an automatic transmission may include a brake disposed between a rotation element connected to a brake hub and a transmission housing, and a piston device disposed corresponding to the brake and operating the brake by hydraulic pressure, wherein the power delivery device configured for an automatic transmission selectively connects the rotation element to the transmission housing by use of dual pistons.

A yaw system for a wind turbine can have a yaw bearing with an outer bearing ring, an inner bearing ring, and a plurality of yaw rollers rotationally disposed between the outer and inner bearing rings so as to allow relative motion between the outer and inner bearing rings. A bi-directional braking assembly having an outer clutch ring attached to the outer bearing ring, an inner clutch ring attached to the inner bearing ring, and a plurality of brake rollers rotationally and slidably disposed between the inner clutch ring and at least one locking ramp adjacent the outer clutch ring. A plurality of spring members can extend from either ring projections or activation projections to each brake roller. An activation ring can slidably position the plurality of brake rollers into one of a locked position or unlocked position to prevent yaw rotation in an undesired direction.

A method for monitoring the performance of a mechanical brake for a linear electromagnetic motor, the linear motor having a linearly moveable output shaft, comprising monitoring travel of the output shaft over the duration of actuation of the mechanical brake and comparing said travel with a predetermined travel threshold.

A method for controlling a braking system of an electromagnetic motor, the electromagnetic motor having a moveable output shaft, comprising the steps of: receiving a velocity signal and/or an acceleration signal based on movement of the output shaft, said velocity signal and/or acceleration signal having a respective frequency spectrum; identifying an event from the velocity and/or the acceleration signal using the respective frequency spectrum, wherein said event corresponds to an uncontrolled movement of the output shaft and has a characteristic frequency spectrum.

A mechanical brake for arresting movement of the output shaft of a linear electric motor, comprising a pivotally mounted plate having a space for receiving the output shaft of the motor; an electrically operated holding device contacting a free end of the plate and arranged to hold the plate in a condition to permit movement of the output shaft and to permit the plate to pivot to a jamming position; wherein the electrically operated holding device comprises a solenoid to control the movement of the plate.

A method for preventing motion of an output shaft (401), of an electromagnetic motor comprising a coil assembly, when a mechanical brake (400) is released, comprising the steps of: determining the position of the output shaft (401); correlating the position of the output shaft (401) with a current such that when applied in the coil assembly induces a force on the output shaft (401) to prevent motion of the output shaft (401) when the mechanical brake (400) is released.