Patent ID: 7063194

Claim:
A rotation transmission device comprising a two-way roller clutch and a solenoid for controlling the engagement of said two-way roller clutch, said two-way roller clutch comprising an outer member, an inner member mounted in said outer member, said outer member having an inner cylindrical surface, said inner member having a plurality of flat cam surfaces on its outer periphery so as to be opposite to said inner cylindrical surface, thereby defining wedge spaces between said inner cylindrical surface and said cam surfaces, a plurality of rollers each mounted between said inner cylindrical surface and one of said cam surfaces, a retainer for retaining said rollers circumferentially separate from one another, a switch spring mounted between said retainer and said inner member for biasing said retainer toward a neutral position where said rollers are not engaged in said wedge spaces, a rotor mounted between said solenoid and said retainer so as to be nonrotatable relative to said outer ring, an armature mounted between said retainer and said rotor so as to be nonrotatable relative to said retainer and axially movable toward and away from said rotor, whereby said armature is attracted to said rotor when said solenoid is energized, and a spring mounted between said rotor and said armature for axially biasing said armature away from said rotor, said rotation transmission device further comprising an engaging plate mounted between said inner member and said armature so as to be nonrotatable relative to said inner member, rotatable relative to said rotor and axially immovable relative to said rotor, and an arrangement provided between said engaging plate and said armature for engaging said armature and said engaging plate together when said armature rotates in one direction by a predetermined angle relative to said engaging plate from a position where said rollers are in said neutral position, thereby preventing said armature from further turning relative to said engaging plate in said one direction.