Patent ID: 7548713

Claim:
A drive transmitting device comprising: a constant velocity joint that transmits a rotation driving force between a driving-side rotating member and a driven-side rotating member that align in an axial direction and engage each other; and a driving motor that is connected to the driving-side rotating member, wherein a rotation driving force of the driving motor is transmitted to a driven member through the constant velocity joint, any one of the driving-side rotating member and the driven-side rotating member includes an outer ring, an inner ring that is located inside the outer ring, a cylindrical space between the outer ring and the inner ring, and a plurality of grooves that extend in an axial direction of the cylindrical space and are located on at least one of the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring to align in a circular direction, the other one of the driving-side rotating member and the driven-side rotating member includes a ball holding member that holds a plurality of balls in a plurality of through-holes in a cylindrical peripheral wall that align in a circumferential direction, the constant velocity joint transmits the rotation driving force between the driving-side rotating member and the driven-side rotating member via the balls when the ball holding member is arranged in the cylindrical space and the balls are engaged in the grooves, and the driving-side rotating member extends inside the driving motor and is directly connected to a rotor as a driving shaft of the driving motor.