A rotary actuator has a stop module configured to mechanically link two gear stages travelling at different rotational speeds when an end-of-stroke travel limit is reached, thereby causing the rotary actuator to bind because relative motion between the gear stages is impeded.

An electric brake including: a brake mechanism configured to transmit a thrust force generated through drive of an electric motor to a piston, the piston being configured to move brake pads to be pressed against a disc rotor; a thrust force sensor configured to detect the thrust force transmitted to the piston; and an ECU for rear electric brake configured to control, based on a detection value obtained by the thrust force sensor, the drive of the electric motor in accordance with a brake command. The ECU for rear electric brake is configured to learn, as a reference point of a piston thrust force, a detection value obtained by the thrust force sensor when the electric motor is driven to move the piston in a direction for pressing the piston against the disc rotor in a range in which the brake pads are not in contact with the disc rotor.

An electric axle drive unit for a motor vehicle, having an electric motor with a stator that is fixedly received in a housing, and a rotor that is rotatably mounted relative to the stator and rotationally coupled or coupleable to a wheel hub. A brake device is operatively connected to the wheel hub. The brake device has a first brake component fixedly supported on the housing, a second brake component rotationally fixed to the wheel hub that is frictionally connectable to the first brake component, and an actuation unit that applies a braking force that interconnects the brake components. One of the brake components has a brake disc element rotationally fixed to a support part and is displaceably received in the axial direction of a rotational axis of the wheel hub relative to the support part.

Provided is an electric brake including: a brake mechanism configured to transmit, based on a braking request, a thrust force generated through drive of an electric motor to a piston configured to move brake pads to be pressed against a disc rotor; and an ECU for rear electric brake configured to control the drive of the electric motor, and to move, in a non-braking state, the piston to a predetermined clearance position at which a clearance between each of the brake pads and the disc rotor is a predetermined amount. The ECU for rear electric brake is configured to drive the electric motor so that a period from generation of the braking request to a start of the pressing of the disc rotor by the brake pads is a predetermined period regardless of a position of the piston at a time when the braking request is generated.

A ball screw drive, in particular for a parking brake, comprises a threaded spindle, a spindle nut, and rolling bodies, namely balls, which are arranged in a thread turn between the threaded spindle and the spindle nut. Spring elements are arranged in the thread turn between nut-side stops. There is at least one setting of the threaded spindle and the spindle nut in which the balls and the spring elements are arranged in the thread turn with backlash.

A brake apparatus for a vehicle may include: a drive unit configured to generate driving power; a transmission gear configured to be rotated by the driving power transmitted from the drive unit; a piston configured to move forward or rearward in conjunction with the rotation of the transmission gear and press or release a pad in a direction in which the piston moves forward or rearward; a parking gear configured to engage with the transmission gear and rotate in conjunction with the rotation of the transmission gear; and a restriction unit installed to be movable toward the parking gear and configured to restrict the rotation of the parking gear by being inserted into the parking gear during parking braking.

A brake caliper for a disc brake has a caliper body straddling a brake disc. The caliper body has a thrust device housing accommodating a thrust device configured to apply a bias on at least one brake pad to abut the at least one brake pad against braking surfaces of the brake disc. The thrust device is operatively connected to a translating screw nut. The translating screw nut is operatively connected to a worm. The worm is operatively connected to a gearbox and rotatably supported by a screw thrust bearing configured to apply for the worm an axial reaction. At least one part of the gearbox is rotatably supported by at least one gearbox thrust bearing configured to apply for the at least one part of the gearbox a radial reaction. The screw thrust bearing and the gearbox thrust bearing are a same thrust bearing.

A brake apparatus for a vehicle may include: a first driver and a second driver each configured to generate a driving force; a transfer gear part rotated by the driving force received from the first driver; a piston part configured to press or release a pad part according to the direction in which the piston part is moved forward or backward; a parking gear part rotated with the transfer gear part; a constraint part moved forward or backward by the driving force of the second driver, and configured to constrain the rotation of the parking gear part by being moved to one side during parking braking; and a locking part configured to transfer the driving force, generated by the second driver, to the constraint part, and to restrict the constraint part from moving to the other side during parking braking.

A brake apparatus for a vehicle may include: a pad unit disposed to face a disc unit; a first caliper body unit fixed to a vehicle body and configured to support the pad unit so that the pad unit is movable; a first pressing unit installed on the first caliper body unit so as to be movable forward or rearward and configured to press the pad unit to apply a main braking force; a second caliper body unit slidably installed on the first caliper body unit; and a second pressing unit installed on the first caliper body unit so as to be movable forward or rearward and configured to press the pad unit to apply a parking braking force together with the second caliper body unit.

The disclosure relates to an actuation device for an electromechanically actuatable motor vehicle brake, for actuating at least one brake lining of the motor vehicle brake. The actuation device comprises at least one drive element, a first power transmission train, a second power transmission train and at least one actuation element. The actuation element is designed to actuate the at least one brake lining. The at least one drive element can optionally transmit drive power to the first power transmission train or to the first and the second power transmission train. The two power transmission trains are operatively connected to the at least one actuation element or can be brought into operative connection therewith.