A drive transmission device includes a clutch mechanism. The clutch mechanism includes a drive transmission member that is coupled to a first rotation member via a torque limiter and is arranged in a fitting part of a second rotation member and a third rotation member, and a transmission member moving part that includes a first gap and a second gap, the first gap being formed in the fitting part and having a width wider than the thickness of the drive transmission member and the second gap being formed in the fitting part and having a width that is equal to or smaller than the thickness of the drive transmission member, the transmission member moving part being formed in such a way that the width thereof becomes smaller about a rotation axis in the fitting part.

A dual speed gearbox is provided that utilizes hydraulically actuated one way clutches and a planetary gear assembly to shift between a direct drive configuration and an overdrive configuration.

An axle includes: an electromagnet; a transmission disc provided with a first magnetic suction member; a half shaft fitted in the transmission disc, first and second gaps being arranged circumferentially between the transmission disc and the half shaft; and a transmission assembly arranged between the transmission disc and the half shaft, and provided with a second magnetic suction member, a thickness of the transmission assembly being less than the first gap, and greater than or equal to the second gap. When the electromagnet is powered off, the transmission assembly and the half shaft are relatively stationary, and the transmission assembly is located at the first gap. When the electromagnet is powered on, the first magnetic suction member and the second magnetic suction member are attracted by the electromagnet, and the transmission disc rotates synchronously with the transmission assembly and rotates to the second gap relative to the half shaft.

An axle includes: an electromagnet; a transmission disc provided with a first magnetic suction member; a half shaft fitted in the transmission disc, first and second gaps being arranged circumferentially between the transmission disc and the half shaft; and a transmission assembly arranged between the transmission disc and the half shaft, and provided with a second magnetic suction member, a thickness of the transmission assembly being less than the first gap, and greater than or equal to the second gap. When the electromagnet is powered off, the transmission assembly and the half shaft are relatively stationary, and the transmission assembly is located at the first gap. When the electromagnet is powered on, the first magnetic suction member and the second magnetic suction member are attracted by the electromagnet, and the transmission disc rotates synchronously with the transmission assembly and rotates to the second gap relative to the half shaft.

A one-way clutch includes a first rotator including an inner gear and configured to rotate on a first axis, a planetary gear configured to mesh with the inner gear and configured to rotate on a second axis that revolves around the first axis, a second rotator configured to rotate on the first axis and including a stopper configured to stop rotation of the planetary gear by engaging with the planetary gear, and an urging member configured to urge the planetary gear not to be brought in contact with the stopper in a state where the first rotator and the second rotator relatively rotate.

A one-way roller clutch, in particular for an adjuster of a disc brake, includes an inner body having an outer lateral surface, an outer ring, which covers the outer lateral surface of the inner body by way of an inner lateral surface in such a way that a clamping gap is formed, and a roller cage. The roller cage is arranged in the clamping gap. Spring-loaded clamping rollers are held in a rollable manner and are supported on respective ramp surfaces. The roller cage is retained on the inner body for conjoint rotation.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

Provided is a one-way clutch in which a rotating direction of a first rotating member with respect to a second rotating member is switched. The first rotating member includes a recessed portion that receives a planetary gear and, in an outer circumferential portion thereof, an engaging portion that engages with the planetary gear, whereby relative rotation of the planetary gear and the first and second rotating members is switched to rotatable and unrotatable. When the first rotating member is relatively rotating with respect to the second rotating member, the planetary gear meshes with an internal gear of the second rotating member, and the position of the planetary gear is thereby restricted.

A transmission for a motor is provided, which optimizes a transmission for outputting a rotational force only in one direction at different shifting ratios according to forward/reverse rotation directions of a rotational shaft of the motor while enabling a reverse input, accurately transmits the rotational force without slippage and has durability even upon use thereof for a long period of time, thereby improving reliability and shifting accuracy and maximizing marketability and market competitiveness.

An interface device includes a first fixed portion and a first rotation portion which are fixed to a body, a first power portion which is connected to the first fixed portion and the first rotation portion and provides power to the first rotation portion, and a control unit which controls the first power portion to control rotation of the first rotation portion when receiving a signal from an external device, and the first power portion switches the first rotation portion to a free state of being rotatable by external force or a control state of being not rotatable by external force in accordance with a signal of the control unit.