| 摘要 |
PURPOSE:To convert the spring load depending of the amount of the extension and the contraction at the same stroke position by leading the excessive oil to one of two oil storage chambers a compression gas is sealed when a piston is operated in the compression side, and linking the both oil storage chambers to return the oil when the piston is operated in the extension side. CONSTITUTION:A compression gas is sealed in oil storage chambers 7 and 8, and a free piston (not shown) to separate the gas and the operation oil is provided. When a piston 2 is slided to the compression side, a spring 21 is bent, the oil in an oil chamber 5 flows to an oil chamber 4 from a valve 19, and moreover, a valve 12 opens a port 14 and closes a linking passage 9, the oil opens an attenuation valve 16 and flows in the oil storage chamber 7 compressing the gas in the oil storage chamber 7, and the load of the spring 21 increasing in a straight line and the load of the gas in the oil storage chamber 7 increasing in a curved line are summed up. When the piston 2 is returned, the pressure in the oil chamber 5 is reduced, the valve 12 closes the port 14 and opens the linking passage 9, the oil in the oil storage chamber 7 enters to the oil storage chamber 8 making the gas pressures in the both chambers equal, and the spring load is reduced gradually after increasing instantly. On the other hand, when the piston is stroked from the intermediate position to the compression side, the spring load is increased gradually from that point increasing the rate of increase gradually. |
