To provide a motor device with a magnet clutch capable of maintaining a superior torque transmission performance even if the transmission and cutoff of a torque is alternately repeated for a long period of time and at high frequency.
The motor device comprises a worm gear 9, a helical gear 6 with an output portion 6a that meshes with the worm gear, a first magnet 2 rotated by the driving force of a motor 1 and a second magnet 3 rotatable integrally with the worm gear and movable axially and integrally with the same. The worm gear meshes with the helical gear in a first position in which the second magnet is attracted to the first magnet. The external force from a driven mechanism 15 is applied as an axial force to the worm gear positioned in the first position. Thereby, the second magnet is separated from the first magnet, so the worm gear is moved to a second position in which the transmission of the torque in combination with the helical gear is blocked. Two or more magnetic poles are formed in the rotation direction of each magnet on the attraction surfaces of the first and second magnets.
YAMAZAKI SEIYA
YAMAKAWA KOJI
TAKAYAMA MASAHIRO
Atsushi Mizumoto
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