A pneumatically driven apparatus, including a hand guided and/or hand held pneumatic power tool, includes a pneumatic rotary vane (PRV) motor, a working element and a gear arrangement for transmitting a rotational movement and torque. The PRV motor includes a housing defining a cylindrical chamber extending along a cylinder axis, and a cylindrical rotor located in the chamber and extending along and rotatable about an axis running to the cylinder axis. The rotor includes radially movable vanes forced radially outwards during rotation of the rotor. The gear arrangement is a magnetic gear arrangement, and that the rotor of the motor includes permanent magnets attached thereto between the vanes, so that the rotor of the PRV motor forms one of the rotating components of the magnetic gear arrangement.

Provided is a magnetic gear which has a large transmission torque, stability, and a simple structure. A magnetic gear (30) includes: a first magnetic pole array (34) that includes first N poles (35) and first S poles (36) alternately arranged on an outer peripheral inclined surface (32) of a rotary disc (31); a second magnetic pole array (37) that includes second N poles (38) and second S poles (39) alternately arranged on the outer peripheral inclined surface (32), one of the second N poles (38) is positioned at a location corresponding to an intermediate position between a corresponding one of the first N poles (35) and a corresponding one of the second S poles (36) that are adjacent to each other.

A method of manufacturing a magnetic pole piece includes molding a magnetic body having an outer wall and an inner wall extending between a first end and a second end, and a trim cap disposed at the first end. The method further includes fixing a non-magnetic isolator to the magnetic body between the outer wall and the inner wall and removing the trim cap.

In the magnetic flux modulation type magnetic gear which uses pole pieces, improvement in demagnetization resistance and suppression of the reduction in torque were issues. Therefore, to the pole pieces provided in a torus shape, a magnetic flux modulation type magnetic gear arranges concentrically a first rotator on the inside of the pole piece and a second rotator on the outside, so that the rotors can be rotated relatively, with the center of the pole pieces as the rotation axis, wherein a first hole part stores, on the inside of the rotator, a first permanent magnet prepared in the rotator, having inclination of a predetermined angle, with respect to the line segment which shows a magnetic pole center, when viewed from the rotation axis. The magnetic gear is configured so as to use the amount of permanent magnets as much as possible.

A magnetic pole piece device for a magnetic gear is provided with: an outer circumferential cover member and an inner circumferential cover member coaxially disposed on an outer side and an inner side in a radial direction, respectively; a magnetic pole piece holder defined by wall members between the outer circumferential cover member and the inner circumferential cover member; and a magnetic pole piece held by the magnetic pole piece holder. The inner ring member, the outer ring member, and the wall members are integrally configured.

A magnetically geared apparatus comprising a rotor, the rotor comprising: a ring structure; and at least one pole piece mounted relative to the ring structure; wherein at least a portion of the ring structure forms a continuous ring radially inner to the at least one pole piece, wherein the at least one pole piece is received in a pole piece-receiving portion, the pole piece receiving portion being open at a radially outer end.

In accordance with various embodiments of the present disclosure, an orbital magnetic gear includes a gear shaft. The orbital magnetic gear also includes a first stator magnet ring fixed at a. first axial position along the gear shaft and a second stator magnet ring fixed at a second axial position along the gear shaft and adjacent the first stator magnet ring. The orbital magnetic gear further includes a rotor magnet ring rotatably coupled to the gear shaft. The rotor magnet ring is canted relative to the gear shaft and to the first and second stator magnet rings.

A differential arrangement having a gear stage that includes at least one input element and at least two output elements is provided. The at least one output element is connected to at least one electrical device in order to distribute torque.

An input cam having a recessed track for establishing a desired dwell time for a plurality of rotatable permanent magnets and an output cam having a recessed track for maximizing the harnessing of linear motion energy and to apply the harnessed energy to a rotary output are provided to improve the efficiency of a magnetic transmission.

A differential includes two magnetic gears each having an internal rotor, an external rotor, and a rotor of the ferromagnetic poles interposed between the internal and the external rotors. The internal rotor, the external rotor and the rotor of the ferromagnetic pole are coaxial and rotate about a gear axis. The internal rotors are connected to a drive, to be placed in rotation about a respective gear axis by the drive. With external rotors suitable for being connected to respective output semi-axes for placing them in rotation, the rotors of the ferromagnetic poles are connected to adjustment means suitable for adjusting the rotation speed of the rotors of the ferromagnetic poles. With external rotors connected to adjustment means suitable for adjusting their rotation speed, the rotors of the ferromagnetic poles are connected to respective output semi-axes for placing them in rotation.