| 摘要 |
<p>A spline (3) is fit on a rotary shaft (1) at a position bounding a first diameter (D1) passing through an axis of the rotary shaft (1), located between a backside inner circumferential surface of a movable pulley disk (4) and a first outer circumferential surface (1a) of the rotary shaft (1), and arranged to restrict rotation of the movable pulley disk (4). A hydraulic fluid chamber (5) for driving the movable pulley disk (4) is formed at a backside position of the movable pulley disk (4). A seal portion (6) for the hydraulic fluid chamber (5) is fit over the rotary shaft (1) at a position bounding a second diameter (D2) passing through the axis of the rotary shaft (1), located at a gap between a sheave-side inner circumferential surface of the movable pulley disk (4) and a second outer circumferential surface (1b) of the rotary shaft confronting the sheave-side inner circumferential surface. The second diameter (D2) is set equal to the first diameter (D1).</p> |
