| 摘要 |
A cylinder apparatus includes a cylinder having a hydraulic fluid sealed therein. A piston rod is connected at one end thereof to a piston slidably fitted in the cylinder. The other end of the piston rod extends to the outside of the cylinder through a seal device provided at the opening end of the cylinder. The seal device has a rod seal and a backup mechanism that presses the rod seal against the piston rod. The backup mechanism has a ring-shaped resilient member provided on the upper surface of a ring-shaped support plate clamped between a rod guide and a seal cap. The ring-shaped resilient member is elastically deformed by an annular tapered wall formed on the seal cap, thereby applying a backup force to the rod seal. Thus, the force with which the rod seal is pressed against the piston rod is kept substantially constant.
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