An electromechanical brake (EMB) may include a nut member coupled to the piston and transferring an axial moving force to the piston; a screw coupled to the nut member and rotated to move the nut member in an axial direction; balls inserted between the nut member and the screw and transferring a rotational force of the screw to the nut member; a compression coil spring having one side mounted on the nut member; and a ball retainer mounted at the other side of the compression coil spring, wherein the ball retainer is disposed to be adjacent to a ball at a rearmost end portion among the balls inserted between the nut member and the screw, and pressurizes the compression coil spring while coming in contact with the balls during braking pressurization.

Disclosed is a railway braking system including a braking device provided with a body, a single piston that can move with respect to the body to act on a brake linkage, and delimiting, together with the body, a pressure chamber supplied by a pressure medium source for placing the piston in a rest position where the linkage applies no force on a braking member of a railway vehicle, first and second seals housed between a first section of the piston and the body, and third and fourth seals housed between a second section of the piston and the body; the first and third seals being configured to form a primary sealing of the pressure chamber and the second and fourth seals being configured to form a secondary sealing of the pressure chamber.

A brake apparatus stops a rotor of an external-rotor motor that drives the head or a joint of a home robot. Frictional torque is generated when a friction pad presses a rotor surface even when a power source is switched off. A posture of a moving part, such as the head, of the robot is not abruptly disturbed even though the power source is switched off. Since a light external force is applied to the moving part of the robot in the off state of the power source, a motion in a direction desired by the user takes places without being stiff. The motion of the head of the robot stops when the external force is removed. An intention of the user who touches the robot may be satisfied even when the power source of the robot is switched off.

An actuator having controlled blocking of an end position and a method for operating a parking brake having such an actuator. The blocking device according to the present disclosure is intended to be constructed to be very wear-resistant and fracture-resistant and the force transmission path of the blocking device is not intended to be directed via the electromagnet which actuates the blocking device. The electromagnet in the state supplied with current presses a blocking cone into a piston counter to a spring by means of a tappet, wherein the blocking cone presses a group of balls which are supported in openings of the piston outwards by means of a conical face and wherein these balls are supported, on the one hand, on a shoulder of a blocking sleeve which is connected to a cylinder and, on the other hand, on the openings of the piston and thereby block a movement of the piston out of the end position thereof. Such a system can be used on vehicles having an electrohydraulically actuated parking brake.

A disc brake (10) of the type including a pivoting lever having eccentric journals which act on a pair of tappets is disclosed. The tappets are adjusted in length by rotation, and each tappet has a tappet gear (22). A centrally located intermediate gear (24) is provided between the tappet gears to form a gear train, synchronizing the rotation of the two tappets and therefore ensuring that they remain the same length. The centrally located intermediate gear (24) includes a socket (26) for receiving a centrally located adjuster. The adjuster may be installed and removed from the disc brake through an aperture at the rear of the brake caliper, without any substantial disassembly of the brake and without de-synchronizing the tappets or even interrupting the gear train between the tappets.

An air disc brake for a road vehicle is proposed, having a mechanism for causing retraction of the brake pads when the brakes are no longer applied, to avoid parasitic drag caused by continued contact of the brake pads against the brake disc. The proposed mechanism includes a pin located in a fixed position relative to one brake pad, and extending through an aperture in the other brake pad. A coil spring is supported on the pin, and pushes the brake pads apart. Where the pin extends through the aperture the extent of the pin provides an indication of the wear state of the pads and disc, which is visible through apertures in the wheel rim.