In a motor power transmission device (30), wherein rotational power of an electric motor (40) is input to a sun gear (51) of a planetary speed reducer (50), and then the rotation of the sun gear (51) is converted to rotation of a planetary carrier (55), and wherein the planetary carrier (55) rotatably supports planetary gears (61, 62) and converts revolving motion of the planetary gears (61, 62) into rotating motion, and the rotation of the planetary carrier (55) is then output to an output shaft (15), a torque limiter mechanism (57) is interposed between the planetary carrier (55) and the output shaft (15). Thus, even if excessive back torque is input to the output shaft, transmission of the back torque to the speed reducer is blocked to protect the speed reducer.

A chain block comprises: a first rotary body in which a first tooth part f is arranged; a second rotary body comprising a second tooth part which opposes to a first tooth part with magnetic attraction force and releasing the magnetic coupling state by sliding toward thrust direction; a clutch pin integrally provided with the second rotary body; a clutch receiving member comprising a plurality of recessed pockets to which the clutch pin enters according to a slide of the second rotary body; wherein the plurality of pockets comprise; a hoisting-side pocket in which a magnetic member is arranged; a lowering-side pocket in which a magnetic member is arranged; and an intermediate pocket which exists between the hoisting-side pocket and the lowering-side pocket and which the clutch pin enters in a state of not being magnetically attracted.

A hub for bicycles with a hub shell rotatably supported relative to a hub axle by roller bearings and a rotor rotatably supported relative to the hub axle by at least two rotor bearings and with a freewheel device with two interacting freewheel components namely, a hub-side freewheel component and a rotor-side freewheel component. The two freewheel components are movable relative to one another in the axial direction between a freewheel position and an intermeshing engaging position in which a driving torque can be transmitted. The hub-side freewheel component is compact in configuration and a hub bearing to rotatably support the hub shell is integrated and configured therein. An outer ring of the hub bearing is configured in an axial body section of the hub-side freewheel component. A sealing unit protects the interior of the hub bearing from the entry of dirt and water.

A mechanical backstop is provided which comprises a housing, an input impact gear, a frictional plate, a floating impact gear, and an output impact gear. The floating impact gear is movably mounted between the input impact gear and the output impact gear to achieve transmission. The frictional plate is fixed relative to the housing and disposed at a side of the floating impact gear close to the input impact gear. When the input impact gear transmits a torque to the floating impact gear, the floating impact gear floats toward the output impact gear to separate from the frictional plate and transmit the torque to the output impact gear. When the floating impact gear transmits a torque reversely, the floating impact gear floats toward the input impact gear to abut against the frictional plate and achieve reverse locking.

Disposable torque-limiting mechanisms with an upper shank component with a torque-limiting interface, a lower shank component with a torque-limiting interface, and a rubbery spring material biasing element. Torque-limiting interfaces having a plurality of undulations arranged around an axial bore or drive socket and separated by a plurality of transition regions, with each undulation having an upslope, a peak, and a downslope. The torque-limiting interfaces are configured to engage and disengage to provide torque transmission with predetermined torque limits at various rotational speeds and for amounts of actuations while remaining within a specified operational range.

A transaxle may include an input shaft including a first shaft and a second shaft; and a torque limiter including an input unit and connected to the other end of the first shaft so as to be relatively non-rotatable, a driven unit connected to a second end of the second shaft so as to be relatively non-rotatable, and a region transmitting a torque between the input unit and the driven unit while limiting the torque to a predetermined value or less. By connecting the input unit and the driven unit of the torque limiter with a one-way clutch, the second shaft is rotatable relative to the first shaft when a rotation direction of the first shaft is a first direction, and the second shaft is non-rotatable relative to the first shaft when the rotation direction is a second direction opposite to the first direction.

A hub for bicycles includes a hub shell which is rotatably supported relative to a hub axle by two roller bearings disposed on opposite ends of the hub shell, a rotor rotatably supported relative to the hub axle by two rotor bearings, and a freewheel device having an interacting hub-side freewheel component and a rotor-side freewheel component. The two freewheel components each have axial engagement elements and are axially movable relative to one another between a freewheel position and an intermeshing engaging position. The rotor is disposed in the same axial position both in the freewheel position and in the engaging position. A driving torque is transmitted in the engaging position. The hub-side freewheel component has an inner central receiving space with a bearing seat and a roller bearing received to rotatably support the hub shell. The hub-side freewheel component includes an appendix protruding outwardly from the axial body section.

An apparatus for transfer of a torque from an internal combustion engine to an auxiliary unit has an auxiliary unit shaft and a pulley rotatably disposed on the auxiliary unit housing. The pulley and the auxiliary unit shaft are connected with one another by an overload protection device configured to interrupt the connection between the pulley and the auxiliary unit shaft if a predetermined torque is exceeded. The overload protection device has a spring washer having multiple spring arms connected, on the end side, with connection elements of a disk-shaped driver until the predetermined torque is reached. Each connection element is configured as a pocket-shaped mounting in the driver, wherein the respective spring arm end lies against a contact surface of the pocket-shaped mounting under spring tension, with force fit. The respective pocket-shaped mounting is configured as a hook-shaped crosspiece cut out of the driver in certain regions.

An axle coupler comprises driver teeth to engage teeth of a corresponding driver; a central aperture having a central axis and a circumference; and the central aperture including axle teeth circumferentially surrounding the central axis; each axle tooth having a first dimensional direction parallel to the central axis; each axle tooth having a second dimensional direction orthogonal to the first dimensional direction; a recess formed in each axle tooth to form a first axle tooth portion and a second axle tooth portion.

A bicycle hub has a hub axle, a hub shell, a sprocket support body, first and second ratchet members and a friction member. The hub shell and the sprocket support body are mounted on the hub axle. The first ratchet member has at least one first ratchet tooth and rotates with the sprocket support body. The second ratchet member has at least one second ratchet tooth mating with the first ratchet tooth and rotates with the hub shell. The friction member is configured to rotate with one of the hub shell and the first ratchet member and contacts a contacted member configured to rotate with the other of the hub shell and the first ratchet member. The sprocket support body has a guiding portion that move the first ratchet member and the second ratchet member from each other while coasting.