| 摘要 |
PURPOSE:To improve the durability and follow-up ability by a method wherein a valve mechanism is located between a gas chamber of a cylinder outside and a cylinder upper oil chamber, the valve mechanism allows the flowing of an oil from the cylinder upper oil chamber only to a gas chamber side, and formed by a check valve separating from a seal member. CONSTITUTION:A ring check valve 30 is arranged between a packing 27 as a seal member and a bearing 25, the ring check valve having flexibility and approximate L-shaped section is flushed with both members 27, 25. The check valve 30 is pushed to the packing 27 and the bearing 25 side via a plate 31 and a spring 32. The thick base end of the check valve 30 is flushed with a valve seat 35 located at the lower part of the packing 27, and the top end of the check valve is flushed with a valve seat 36 as freely capable of opening and closing, the valve seat 36 forms the outer periphery tapered surface of a truncated-cone-shaped protrusion 37 protruded at the upper part of the bearing 25. |
