| 主权项 |
1. A driving force transmission device configured to switch between transmission and disconnection of a rotational driving force between a first shaft body and a second shaft body placed coaxially, the driving force transmission device comprising:
an inner ring coaxially connected to the first shaft body; a tubular outer ring coaxially connected to the second shaft body and provided so as to be rotatable relative to the inner ring; a roller pair arranged in a circumferential direction in a wedge space formed by an outer periphery of the inner ring and an inner periphery of the outer ring, the roller pair being constituted by a first roller on a circumferential first side and a second roller on a circumferential second side; an elastic member configured to elastically press the first roller toward a first engaged position which is provided on the circumferential first side in the wedge space and at which the first roller engages with the outer periphery of the inner ring and the inner periphery of the outer ring, and configured to elastically press the second roller toward a second engaged position which is provided on the circumferential second side in the wedge space and at which the second roller engages with the outer periphery of the inner ring and the inner periphery of the outer ring; a first cage including a first pressing portion provided so as to press the first roller toward the circumferential second side, the first cage being configured to retain the roller pair; a second cage configured to retain the roller pair, the second cage including a second pressing portion provided so as to press the second roller toward the circumferential first side, the second cage being provided so as to be rotatable relative to the first cage; a first guide member configured to make slide contact with the first cage from the circumferential first side, the first guide member having a first slide-contact surface constituted by a tapered surface inclined toward the circumferential first side in a direction toward an axial first side, and the first guide member being provided so as to be axially movable; a second guide member configured to make slide contact with the second cage from the circumferential second side, the second guide member having a second slide-contact surface constituted by a tapered surface inclined toward the circumferential second side in the direction toward the axial first side, and the second guide member being provided so as to be axially movable; and an electromagnetic clutch including an armature connected to the first and second guide members, the armature being configured to be driven such that the first and second guide members are axially movable, wherein along with rotation of the first cage toward the circumferential second side, the first pressing portion presses the first roller toward the circumferential second side, and along with rotation of the second cage toward the circumferential first side, the second pressing portion presses the second roller toward the circumferential first side. |
