| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size and power consumption of an electric motor, in an actuator for a continuously variable transmission, in which a moving screw body of a ball screw mechanism receives rotating power transmitted from an electric motor side and moves in an axial direction, and a movable sheave receives driving power in the axial direction of the movable screw body and moves in the axial direction. SOLUTION: An intermediate shaft 9, which is only allowed to be rotated with respect to the movable sheave 3, is inserted into a cylinder inner peripheral face 5a of a housing 5. A double rows of balls 16a, 16b are held, by means of a cage 17, in a wedge space formed between an outer periphery of the intermediate shaft 9 and the cylinder inner peripheral face 5a. Normally, the balls are engaged with the wedge space by urging the double rows of balls 16a, 16b, so that the intermediate shaft 9 is locked to both sides in the axial direction with respect to reverse input in the axial direction from a movable sheave 3 side. The cage 17 can be moved integrally with a screw shaft 14 of the ball screw mechanism 6 so that the cage can be engaged with the intermediate shaft 9 in the axial direction. Therefore, when the screw shaft 14 is moved by the drive of the electric motor 4, the intermediate shaft 9 and the movable sheave 3 are integrally moved through the cage 17. COPYRIGHT: (C)2008,JPO&INPIT
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