| 摘要 |
PURPOSE:To keep a rotary sleeve at a proper position, by installing both of a through hole piercing both ends faces of a rotary sleeve and a suspensive cushion hole extending into the insie of a thick part of the rotary sleeve from these end faces. CONSTITUTION:In a rotary sleeve 17, each through hole 35 piercing both sides of the rotary sleeve througt and each suspensive cushion hole 36 extending into the inside of a thick part of the rotary sleeve from both end faces 17a are all installed at regular intervals in a direction of the whole circumference. Since gas in both end faces of the rotary sleeve is interconnected by the through hole 35, pressure at both ends is well balanced whereby dislocation on the rotary sleeve 17 in its one axial direction is thus checked. In addition, volume of a gas chamber being in a state of being half-sealed in both end faces of the rotary sleeve is secured by the suspensive cushion hole 36 so that an air cushion is formed at both ends. |
