| 摘要 |
Since a threaded shaft 111 of a ball screw mechanism is disposed parallel to a pulley shaft 201 and an axial displacement of the threaded shaft 111 is converted into an axial displacement of a movable sheave 207 by a fork member 300 which swings, the inertia of a nut member 107 can be suppressed, and a high-speed control of a pulley width can easily be implemented. By the fork member 300 being interposed between the threaded shaft 111 and the movable sheave 207, even though the movable sheave 207 is inclined by a biased force of a belt 211, a the threaded shaft 111 is not inclined, thereby making it possible to suppress a reduction in fatigue life.
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