| 摘要 |
PURPOSE: A hydraulic cylinder is provided to facilitate the charging of cushion oil by automatically supplying working fluid with a simple structure. CONSTITUTION: A hydraulic cylinder comprises a tube(10), a grand(20), a rod(30), a piston, and an automatic oil supply part(50). The bottom of the tube is closed, and the top thereof is opened. A port(11) is communicated with the bottom of the tube. The grand is mounted on the opened top of the tube. The rod is slidingly arranged inside the tube and penetrates through the grand. The piston is mounted on the bottom of the rod. A piston chamber(41) is installed in the outer circumference of the piston. The automatic oil supply part is formed on the interior of the tube at the bottom of the grand. The automatic oil supply part moves working fluid passing through the port into the grand via the piston chamber when the rod is in a top dead point. |
