| 主权项 |
1. A rotation transmission device comprising:
a two-way clutch configured to selectively perform and stop transmission of torque between an input shaft and an output shaft arranged coaxially with the input shaft; and an electromagnetic clutch including an electromagnet, and configured to selectively engage and disengage the two-way clutch, wherein the two-way clutch comprises: an outer ring provided at an end portion of the output shaft; an inner ring provided at an end portion of the input shaft; a control retainer having pillars; and a rotary retainer having pillars; wherein the pillars of the control retainer and the pillars of the rotary retainer are arranged between an inner periphery of the outer ring and an outer periphery of the inner ring such that the pillars of the control retainer circumferentially alternate with the pillars of the rotary retainer; wherein pockets are defined between adjacent ones of the pillars of the control retainer and the pillars of the rotary retainer, wherein the two-way clutch further comprises: a plurality of pairs of rollers, each pair being mounted in each of the pockets so as to be engageable with a cylindrical surface formed on the inner periphery of the outer ring and each of cam surfaces formed on the outer periphery of the inner ring; and elastic members each mounted in each of the pockets and biasing the corresponding pair of rollers in a direction away from each other, wherein the rotation transmission device further comprises a spring holder for restricting an axial movement of the rollers, the spring holder being fitted on the input shaft and abutting one of two axial end surfaces of the inner ring so as to be rotationally fixed and axially positioned, wherein the spring holder is formed on an outer periphery of the spring holder with a plurality of spring holding pieces extending to overhang the respective elastic members, and wherein the rotation transmission device is configured such that when the electromagnet of the electromagnetic clutch is energized, and the control retainer axially moves, the control retainer and the rotary retainer rotate relative to each other in a direction in which circumferential widths of the respective pockets decrease, so that the rollers are disengaged from the inner periphery of the outer ring and the outer periphery of the inner ring, and wherein at least one of the spring holding pieces is formed with an engagement surface engaging with one of the cam surfaces of the inner ring such that the spring holder is rotationally fixed. |
