Disclosed herein a caliper brake includes a carrier in which a pair of pad plates are installed to move forward and backward toward a disk; a caliper housing slidably installed on the carrier and provided with a cylinder; a piston installed in the cylinder and configured to move forward and backward toward the pair of pad plates by a braking hydraulic pressure; a seal groove formed to be recessed in an annular shape on an inner surface of the cylinder; and a seal member accommodated in the seal groove, the seal member including a front surface located in a forward direction of the piston; wherein the front surface is provided with a protrusion from which at least a part thereof protrudes.

An electromechanical assembly for a braking system of a railway vehicle is described, characterized in that it comprises a flywheel arranged to accumulate kinetic energy; wherein the kinetic energy accumulated in the flywheel is sufficient to operate the electromechanical assembly to cause the braking system to perform at least one emergency or service or parking brake action. Also described are a control system for an electromechanical assembly for a braking system of a railway vehicle and a braking system for a railway vehicle.

A parking brake for a wheel rotor having a brake pad associated therewith includes a housing defining first and second passages. First and second pistons are provided in the respective first and second passages. Spindles are threadably connected with each piston. A clutch unit is connected to the spindles. The clutch unit has a first condition allowing relative rotation between the spindles and the pistons such that the pistons are axially movable within the passages and into engagement with the brake pad in response to hydraulic pressure applied to the pistons. The clutch unit has a second condition preventing relative rotation between the spindles and the pistons such that pistons remains engaged with the brake pad when hydraulic fluid pressure is removed from the pistons.

A parking brake for a wheel rotor having a brake pad associated therewith includes a housing defining first and second passages. First and second pistons are provided in the respective first and second passages. Spindles extend into and are connected with each piston. A clutch unit is connected to the spindles and includes a motor. The clutch unit has a first condition allowing for rotation of the spindles in response to hydraulic pressure applied to the pistons such that the pistons are axially movable within the passages and relative to the spindles into engagement with the brake pad. The clutch unit has a second condition for rotating the spindles to drive the pistons into the brake pad and apply the parking brake.

A method for controlling vehicle braking of a wheel rotor having a brake pad associated therewith includes moving a piston into engagement with the brake pad by applying hydraulic pressure to the piston. The piston is locked in place against the brake pad with a parking brake. The hydraulic pressure is removed from the piston while the parking brake is locked.

A braking system includes a frame, an actuator coupled to the frame, a rotating joint coupled to the actuator and the frame, an arm coupled to the rotating joint, a brake pad having a connector, the connector pivotably coupled to the arm, and a torsion spring positioned at the connector to bias the brake pad relative to the arm.

An actuation device for a hydraulic actuation system, e.g., a motor vehicle brake or an electrified clutch actuator, may include a connection for an actuation device; a pressure supply device, driven by an electromotor drive, in the form of a piston or double-stroke piston pump; a piston cylinder unit that may be actuated by means of the actuation device; and an electronic control unit. An axis of the piston cylinder unit and an axis of the pressure supply device may be arranged in parallel.

An electric parking brake device includes: a “linear motion member configured to be driven by an electric motor, moved in a forward direction so as to apply a parking brake and moved in a backward direction opposite to the forward direction so as to release the parking brake”; and a “controller configured to control the electric motor”. When the parking brake is released, the controller stops energization to the electric motor at a time point when a first predetermined time elapses after a time point when an energization amount to the electric motor becomes constant.

A system for controlling an electric brake for a wheel rotor having a brake pad associated therewith includes a housing defining a passage. An assembly is provided in the passage and includes a spindle rotatable about an axis and a piston aligned with the brake pad and axially movable in response to rotation of the spindle. A planetary gear stage includes a sun gear, a ring gear, and planetary gears. A first motor is coupled to the sun gear. A second motor coupled to the ring gear. A control system is configured to, in response to a detected braking event, rotate the first motor in a first direction to supply torque to the sun gear while the second motor is rotated in a second direction at varying speeds to supply torque to the ring gear such that the piston is cyclically moved towards and away from the brake pad to modulate a braking force on the rotor.

A brake assembly with multiple telescoping structures comprises: a rotatable part configured to be rotated by an actuator; a fixed part comprising an outer ball nut fixed to a housing; a rotatable and translatable part comprising an outer ball screw and an inner ball nut, wherein the outer ball screw is operably coupled with the outer ball nut through first rolling bodies, and the rotatable and translatable part is operably coupled with the rotatable part and is rotatable relative to the outer ball nut and axially translatable relative to the rotatable part and the outer ball nut simultaneously by rotation of the rotatable part; a translatable part comprising an inner ball screw operably coupled with the inner ball nut through second rolling bodies and configured to be axially translated relative to the inner ball nut by rotation of the inner ball nut to move a brake pad assembly.