| 摘要 |
<p>A hydraulic end of car cushioning device for use in railway freight cars. The device is intended for use between the coupler shank and car under-frame of a fixed sill type car and is designed so as to provide a long cushioning stroke under high impact loads. A load responsive check valve is interposed in the metering system of the cushioning device for preventing changes in length of the unit under lower buff and draft forces as occur in train action. More specifically there is provided a cylinder with a piston received in the cylinder and the piston and cylinder defining a chamber adapted to receive fluid. A primary metering device includes an orifice and a cooperating metering rod, the device being in communication with the chamber for passing fluid therethrough at a restricted rate upon relative movement of the piston and the cylinder. A pressure responsive valve is provided in series flow arrangement with the primary metering device for precluding the flow of fluid through the primary metering device until a predetermined force is applied to the cushioning device.</p> |
