Rotation transmission device

A rotation transmission device comprising an outer ring, an inner ring mounted inside said outer ring, said inner and outer rings being rotatable relative to each other, a two-way clutch comprising engaging elements disposed between radially opposed surfaces of said inner and outer rings, respectively, so as to be engageable with and disengageable from said radially opposed surfaces, and a retainer disposed between said radially opposed surfaces and retaining said engaging elements in position, an electromagnetic clutch provided in juxtaposition with said two-way clutch and comprising an armature rotationally fixed to said retainer so as to be axially movable relative to said retainer, a rotor rotationally fixed to said outer ring and axially facing said armature, and an electromagnet including a core and axially facing said rotor for magnetically attracting said armature until pressed against said rotor when energized, a stationary member formed with a recess having an end wall, and a positioning structure for axially positioning said electromagnet,

• said positioning structure comprising a flange fixed to said core of said electromagnet and received in said recess of said stationary member, a snap ring engaged in a groove formed in an inner periphery of said recess, said snap ring engaging said flange to prevent said flange from coming out of said recess, and an elastic member disposed between said end wall of said recess and said flange, thereby pressing said flange against said snap ring.