Power transmission systems are provided that include polycrystalline diamond power transmission surfaces that are engaged with diamond solvent-catalyst power transmission surfaces. The power transmission systems may be or include gears, universal joints, or other power transmission systems or components.

Power transmission systems are provided that include polycrystalline diamond power transmission surfaces that are engaged with diamond solvent-catalyst power transmission surfaces. The power transmission systems may be or include gears, universal joints, or other power transmission systems or components.

A gear assembly includes an actuation gear and plural separate pinion bodies. The actuation gear has first gear teeth on one or more surfaces of the gear and is configured to rotate around an actuation axis of rotation. The pinion bodies have second gear teeth configured to mesh with the first gear teeth of the actuation gear in plural separate mesh zones of the actuation gear. Each of the plural separate pinion bodies are configured to be rotated about respective pinion axes of rotation to cause rotation of the actuation gear around the actuation axis of rotation.

A drive assembly is provided and includes a rotatable housing, a motor disposed within and to rotate with the housing, the motor including a drive element and first and second drive shafts, which are independently rotatably drivable by the drive element, a first drivable element coupled to the first drive shaft such that rotation thereof is transmitted to the first drivable element and configured to propel the housing in a first direction during first drive shaft rotation and a second drivable element coupled to the second drive shaft such that rotation thereof is transmitted to the second drivable element and configured to propel the motor in a second direction, which is transversely oriented relative to the first direction, relative to the housing during second drive shaft rotation.

Powered limb prostheses with multi-stage transmissions are provided.

An axle assembly having a drive pinion assembly. The drive pinion assembly may have a drive pinion body, a pinion gear, and a side gear. The pinion gear may be fixedly disposed on a first end portion of the drive pinion body. The side gear may be fixedly disposed on a second end portion of the drive pinion body.

The present invention provides a solar photovoltaic rotation device installed the top of a pole so as to rotate a solar panel array, the solar photovoltaic rotation device comprising: a first tubular body connected to the solar panel array; a second tubular body coupled to the lower portion of the first tubular body and fixed to the top of the pole; a gear unit for transferring a rotation force to the first tubular body; and a driving motor fixed in the second tubular body so as to provide a rotation force to the gear unit, wherein the gear unit is formed as a planet gear set comprising: a sun gear connected to a rotating shaft of the driving motor; multiple PL gears disposed at predetermined intervals around the sun gear so as to be able to mesh with the sun gear; and a ring gear disposed outside the multiple PL gears so as to be able to mesh with the PL gears, the ring gear being fixed to the first tubular body, and at least one among the sun gear, the PL gears, and the ring gear has inclined teeth formed on the circumferential surface thereof, and thus has a tapered structure.

A vehicle drive apparatus, including an electric motor including a rotor rotating about a first axial line in a vertical direction and a stator disposed around the rotor, a first rotating shaft rotating integrally with the rotor and including a first gear at an end portion thereof, a pair of left and right second rotating shafts extended along second axial lines parallel to the first axial line and including second gears at end portions thereof so as to mesh with the first gear and worm gears rotating about the pair of left and right second axial lines, a pair of left and right worm wheels rotatable about a third axial line in a left-right direction and provided so as to mesh with the worm gears, and a pair of left and right drive shafts to which torques from the worm wheels are input.

This mechanism for driving motions of a surface of spherical, ellipsoidal, plane, or other shape comprises a pair of drive wheels mounted on a freely pivoting frame, each wheel being driven by its own bidirectional motor. The motors and the active electronics of an angle encoder are mounted in an associated fixed frame, so no slip rings or other rotating connections are needed for motor power and control, or for determining the rotation angle of the pivoting frame. Control of the motors provides differential rotation of the two wheels to effect controlled rotation of the pivoting frame, and therefore of wheel direction. This avoids the use of a separate motor for changing the direction of motion of the surface. All parts of the mechanism driving wheel rotation are enclosed by the pivoting frame or the fixed frame.

This mechanism for driving motions of a surface of spherical, ellipsoidal, plane, or other shape comprises a pair of drive wheels mounted on a freely pivoting frame, each wheel being driven by its own bidirectional motor. The motors and the active electronics of an angle encoder are mounted in an associated fixed frame, so no slip rings or other rotating connections are needed for motor power and control, or for determining the rotation angle of the pivoting frame. Control of the motors provides differential rotation of the two wheels to effect controlled rotation of the pivoting frame, and therefore of wheel direction. This avoids the use of a separate motor for changing the direction of motion of the surface. All parts of the mechanism driving wheel rotation are enclosed by the pivoting frame or the fixed frame.