Patent ID: 7434354

Claim:
A power device for a vehicle sliding door comprising: a worm wheel rotatable about a supporting shaft by a motor; a stationary gear member supported by the supporting shaft; a clutch mechanism for transmitting the rotation of the wheel to the stationary gear member; and said clutch mechanism comprising a movable gear member rotatable integrally with the wheel and engagable with the stationary gear member when the movable gear member is moved in a first direction and disengaged from the stationary gear member when the movable gear member is moved in a second direction opposite to the first direction; an armature which moves the movable gear member in the first direction when the armature is rotated relative to the movable gear member; and an electromagnetic coil for applying a break resistance to the armature by attracting the armature by a magnetic force in order to rotate the armature relative to the movable gear member; wherein said armature is provided with a clutch holding surface which maintains a clutch-engaged state where the movable gear member and the stationary gear member are engaged with each other even when the electromagnetic coil is turned off; and wherein said armature is provided with a cam surface having a slant surface angled with respect to an axis of said shaft and said clutch holding surface protrudes transverse to and approximately halfway along the length of the slant surface.