An apparatus (B) controls rotation of an annular member (36) relative to top and bottom housings (12, 10). The bottom housing (10) includes a disk (110) extending radially and terminating in a cylindrical portion (112) having circumferentially spaced slits (212). A wedge (16) abuts with the cylindrical portion (112) and is moved radially between first and second positions by an axially moveable piston (14), with the wedge including an angle surface (340) which interfaces with an angled surface (520) of the piston (14) through a plurality of balls (18). The disk (110) and the cylindrical portion (112) are formed as a single component of material having sufficient material strength and yield to allow engagement and disengagement of the cylindrical portion (112) with the annular member (36). The wedge (16) is slideable between an axial surface (250) of the disk (110) and a guiding flange (450) of the top housing (16).

A drive device has a spindle drive having a threaded spindle and a spindle nut arranged on the threaded spindle. The spindle drive is configured to drive a first component element and a second component element so as to be axially movable relative to one another. The spindle drive is reversibly rotatably drivable around an axis of rotation extending coaxial to the threaded spindle by a rotatably driven driveshaft arranged in a housing so as to be fixed with respect to rotation. A brake device prevents axially relative movement of the first component element and second component element relative to one another through axial application of force to the first component element and/or second component element.

A drive device has a spindle drive having a threaded spindle and a spindle nut arranged on the threaded spindle. The spindle drive is configured to drive a first component element and a second component element so as to be axially movable relative to one another. The spindle drive is reversibly rotatably drivable around an axis of rotation extending coaxial to the threaded spindle by a rotatably driven driveshaft arranged in a housing so as to be fixed with respect to rotation. A brake device prevents axially relative movement of the first component element and second component element relative to one another through axial application of force to the first component element and/or second component element.

Disclosed herein is a single shoe-type brake apparatus. The single shoe-type brake apparatus includes: an integrated sideways U-shaped single brake shoe configured to form an open ring shape, to be integrated into a single body, and to have a separation region on one side thereof so that it is subjected to external force in a direction where it is extended to both sides thereof; a cylinder installed in the separation region, and configured to provide the external force; and a friction material coupled to the outer circumferential surface of the brake shoe, and installed to selectively come into contact with a brake drum as the brake shoe is extended. The friction coefficient of the friction material is considerably lower than that of a common brake friction material, and a brake factor is almost identical to that of a brake apparatus having two shoes.

Disclosed herein is a single shoe-type brake apparatus. The single shoe-type brake apparatus includes: an integrated sideways U-shaped single brake shoe configured to form an open ring shape, to be integrated into a single body, and to have a separation region on one side thereof so that it is subjected to external force in a direction where it is extended to both sides thereof; a cylinder installed in the separation region, and configured to provide the external force; and a friction material coupled to the outer circumferential surface of the brake shoe, and installed to selectively come into contact with a brake drum as the brake shoe is extended. The friction coefficient of the friction material is considerably lower than that of a common brake friction material, and a brake factor is almost identical to that of a brake apparatus having two shoes.

A clutch/brake assembly includes: an input shaft arranged to be rotated, in use, by a motor; an output shaft configured to be rotated by the input shaft when brought into engagement therewith; rotating clutch plate elements configured to transmit torque from the input shaft to the output shaft when engaged; a logarithmic spring mounted around the input shaft; a translating shaft around the spring; an output sleeve between the output shaft and the clutch plate elements; and a solenoid connected to the translating shaft. The solenoid can be in at least two states and either cause movement of the translating shaft to compress the spring in first or second directions control the assembly.

A clutch/brake assembly includes: an input shaft arranged to be rotated, in use, by a motor; an output shaft configured to be rotated by the input shaft when brought into engagement therewith; rotating clutch plate elements configured to transmit torque from the input shaft to the output shaft when engaged; a logarithmic spring mounted around the input shaft; a translating shaft around the spring; an output sleeve between the output shaft and the clutch plate elements; and a solenoid connected to the translating shaft. The solenoid can be in at least two states and either cause movement of the translating shaft to compress the spring in first or second directions control the assembly.