| 摘要 |
<p>Disclosed is a rotation transmitting device having a small amount of play in the rotational direction, having high reliability sufficient to ensure the prevention of roller misengagement in the idle rotation state, and having large torque capacity. The rotation transmitting device comprises a control retainer (19A) and a rotation retainer (19B) provided between an outer ring (11) having a cylindrical surface (17) on the inner circumference and an inner ring (12) having a cam surface (18) on the outer circumference, a pair of opposing rollers (25) provided in a pocket (24) between column portions (21, 23) provided in the retainers (19A), (19B), and a presser (26) for pressing the pair of rollers (25) against the cam surface (18) of the inner ring (12) while urging the rollers in opposing directions. A plurality of torque cams (40) are provided between flanges (20, 22) of the control retainer (19A) and the rotation retainer (19B). When the control retainer (19A) moved by the actuation of an electromagnetic clutch (50) is moved toward the rotor (52), the control retainer (19A) and the rotation retainer (19B) are relatively rotated by the torque cam (40) in the direction in which the circumferential width of the pocket (24) decreases, thereby establishing a disengaged state of the pair of opposing rollers (25). When the control retainer (19A) is moved in a direction away from the rotor (52), the control retainer (19A) and the rotation retainer (19B) are relatively rotated by the pressure of the presser (26) in the direction in which the circumferential width of the pocket (24) increases, thereby establishing an engaged state of the pair of opposing rollers (25). During idle rotation of the inner ring (12), outward movement of the pair of opposing rollers (25) in the radial direction is prevented by the presser (26) and, as a result, misengagement of the rollers (25) is prevented.</p> |
