Patent ID: 11926013
Assignee: nan
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 13:
14. A pneumatically driven apparatus in the form of a hand held pneumatic power tool (1), comprising:
a) a pneumatic machine (300) including
i. a pneumatic rotary vane motor (100) having a housing (102) defining a cylindrical chamber extending along a cylinder axis, and a cylindrical rotor (104) located in the cylindrical chamber and extending along and rotatable about a rotational axis (60) running parallel or coaxial to the cylinder axis, the cylindrical rotor (104) having a motor shaft (22) and a plurality of vanes (108) radially movable in respect to the motor shaft (22) and forced radially outwards during rotation of the cylindrical rotor (104),
ii. a working element (9) realizing a working movement, when the pneumatic rotary vane motor (100) is activated, and
iii. at least one gear arrangement for transmitting a rotational movement and torque from the pneumatic rotary vane motor (100) to the working element (9) in order to realize the working movement, wherein the at least one gear arrangement includes a magnetic gear arrangement (20) using magnetic fields to transmit the rotational movement and torque from the pneumatic rotary vane motor (100) to the working element (9), the magnetic gear arrangement (20) having a plurality of components (52, 54, 51) which rotate relative to each other about rotational axes (60) running coaxial in respect to one another;

b) wherein the magnetic gear arrangement (20) includes
i. a first rotating component (52) of the plurality of components (52, 54, 51) configured by the motor shaft (22) of the pneumatic rotary vane motor (100) having a first number (n_input) of magnetic pole pairs with permanent magnets (56) attached to the motor shaft (22) between neighboring vanes (108) of the plurality of vanes (108) and configured to rotate and generate a first magnetic field,
ii. a second rotating component (54) of the plurality of components (52, 54, 51) configured by an intermediate shaft (23) extending along and rotatable about the rotational axis (60) and having a second number (n_pp) of magnetic pole pairs with permanent magnets (58) configured to generate a second magnetic field, and
iii. the housing (102) being a third component (51) of the plurality of components (52, 54, 51) having a third number (n_output) of ferromagnetic pole pieces (50) configured to act as a passive part of a magnetic circuit between the first rotating component (52) and the second component (54) and configured to transmit magnetic flux from the first rotating component (52) to the second rotating component (54) in a transverse direction extending parallel in respect to rotational axis (60).