| 摘要 |
PURPOSE:To restrain the heat shrinkage in the radial direction of a seal ring and favorably carry out the sealing of the inner wall face of a cylinder body by fitting an auxiliary cylinder body which has no heat-shrinkage property inside said sea;ring fitting in the opening part of said cylinder body, without leaving a gap. CONSTITUTION:A cylinder member 23 is fitted in the support hole 21 of the side board 11b of a housing 11 which forms a base plate, and a rotary shaft 13 is provided passing through the cylinder member 23 via a bearing 27. And, a support ring member 31 is fitted over the crank arm 13a of the rotary shaft 13 via a bearing 33 and a housing cylinder part 35 corresponding to a rotary cylinder body is integrally formed with one end of the support ring member 31. Further, a seal ring 51 is fitted in one end part of the housing cylinder part 35 while the seal ring 51 is pressed in the direction fo the side board 11 by means of an annular spring 59. In this structure, a cut-out stepped part 56 is formed on the inner wall face of the seal ring 51 and an auxiliary cylinder body 58 made of metal is projected out of one end of the seal ring 51 and engaged with the cut-out stepped part 56.
|
