| 摘要 |
A hydraulic strut having a damping rate that is variable includes a bypass valve which is operated to open and close by a gas spring supported within the piston of the strut. A main orifice plate divides an oil-filled cavity within the strut into first and second oil chambers, the orifice plate defining a primary orifice for passage of oil between the chambers. The gas spring includes an inner cylinder member affixed to the end wall of the piston, and a diaphragm slidably mounted within the cylinder member, the cylinder member and diaphragm defining a pressurized gas-filled cavity. The diaphragm supports a valve pin which is slidable within a passage in a tubular valve body, the valve body being fixed with respect to the piston, and the passage extending between the first and second oil chambers. Secondary orifices in the valve body communicate with oil in the first oil chamber. The valve pin includes openings which are alignable with the secondary orifices, the openings extending into an axial hole in the valve pin, the axial hole being in communication with the passage in the valve body. Compression of the strut causes compression of the gas spring, which causes movement of the diaphragm so as to move the valve pin within the valve body and thereby bring the openings in the valve pin into alignment with the secondary orifices in the valve body. Oil is thereby allowed to bypass the primary orifice and flow through the bypass valve between the oil chambers.
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