A freewheel mechanism containing an external raceway, rolls, wedges, characterized in that, it contains the external raceway (1) and an external gear (2) that are rigidly connected with each other, and it contains satellite gears (5) and rolls (4) that are rigidly connected with each other, wherein the satellite gears (5) mate with the external gear (2), wherein the satellite gears (5) are mounted on satellite axles (7), wherein the satellite axles (7) are mounted in a yoke (8), wherein the freewheel mechanism contains wedges (9a) of type A, which are placed between the rolls (4) and the external raceway (1).

A uni-directional drive gear includes a plurality of teeth each pivotably mounted on a mounting seat to be turned between driving and idle positions so as to permit the gear to rotate in a uni-rotational direction. A gear transmission device having the uni-directional drive gear can be configured to perform different transmissions to suit a wide variety of requirements.

A reverse rotation prevention mechanism is provided on a torque transmission path between an output shaft and a driving shaft of a motor, and includes: a relative rotation inhibition unit configured to inhibit rotation of a lock plate provided on the torque transmission path from rotating relative to an output pin when an external force in a rotational direction is exerted on the output shaft; and a lock plate side brake member configured to generate a braking force that prevents reverse rotation when an external force in the rotational direction is exerted on the output shaft, by causing a portion of the lock plate to be pressed. The relative rotation inhibition unit is provided in an area different from the lock plate side brake member.

A uni-directional drive gear includes a plurality of teeth each pivotably mounted on a mounting seat to be turned between driving and idle positions so as to permit the gear to rotate in a uni-rotational direction. A gear transmission device having the uni-directional drive gear can be configured to perform different transmissions to suit a wide variety of requirements.

A driving system for a vehicle includes drive source, a driven portion, a unidirectional power transmitting unit provided on a power transmission path between the drive source and the driven portion, and having a first member, a second member, and an engaging element interposed between the first member and the second member, and an eccentricity acquiring unit adapted to acquire an eccentricity, the eccentricity being a magnitude of deviation between the rotational axis of the first member and the rotational axis of the second member.

An electrical propulsion system for bicycles (E-bike) is claimed. The system comprises an electric motor, at least three speed reduction stages and an output gear (driven gear). The motor has an output shaft oriented towards one side of the system, while the output gear is located on the opposite side of the system. The first and second reduction stage are located on the same side as the drive gear which is mounted on the output shaft of the motor. The sub-claims specify the first reduction stage to be a planetary gear set and specify the location of the third reduction stage. Further is the motor defined as high speed motor and is the system specified as module for mounting to a bicycle bottom bracket.

A patient support system comprises a patient support apparatus for patients. The patient support apparatus comprises a base and a patient support surface supported by the base. The patient support apparatus also comprises movable members that are movable between at least a first position and a second position. One or more hollow rotary actuators are coupled to each movable member. The hollow rotary actuator permits drive torque to move the movable member in a desired position between the first and second positions and restricts back drive torque from moving the movable member. The hollow rotary actuator is also hollow to allow objects to be placed therethrough.

Proposed are a speed reducer having a self-locking function without a ring gear, and a self-locking method of the speed reducer. Particularly, the speed reducer is characterized in that first, second and third planetary gears are supported at different locations on one side of a carrier, which is an input side, so as to be able to rotate and revolve and be disposed in n sets, and when fixing any one of a first sun gear and a second sun gear and switching one remaining sun gear into an input side and rotating the same, speed is not increased due to a self-locking function and a speed increase ratio is zero (a stationary state in which the sun gear used as the input side cannot rotate), thereby resulting in self-locking which is a non-operating state.

A gear transmission including: a plurality of gear wheels having a different diameter meshing with each other, at least one first driving gear wheel activated in rotation about its own axis, and at least one second driven gear wheel meshing with the first gear wheel, teeth being asymmetrical, with active sides conjugate with one another inactive sides of the teeth of the wheels not being conjugated with one another, and the inactive side is configured so that the radius passing by a tip of the teeth is substantially tangent to the inactive side or intersects the inactive side.

An apparatus includes a gearset that includes an input gear configured to be rotated by an input shaft, first and second one-way clutches, first and second output gears configured to drive rotation of an output shaft via the first and second one-way clutches, respectively, and an idler gear. The second output gear has a smaller outer diameter than the first output gear. The input gear is configured to (i) rotate the first output gear in a first direction and (ii) rotate the idler gear in the first direction. The idler gear is configured to rotate the second output gear in a second direction opposite the first direction. The first and second one-way clutches are configured to allow the first and second output gears to drive rotation of the output shaft in a single predetermined rotational direction regardless of a rotational direction of the input shaft.