RAIL VEHICLE HYDROPNEUMATIC SPRING Russian patent published in 1998 - IPC

FIELD: railway transport. SUBSTANCE: hydropneumatic spring has hydraulic cylinder, piston with rod arranged in cylinder, hydropneumatic accumulator with resilient diaphragm communicating with above-pistons space of hydraulic cylinder. Resilient diaphragm of hydropneumatic accumulator separates liquid from gas. Hydropneumatic accumulator has also rigid partition with throttling channel to divide gas space into two chambers. Under-diaphragm liquid space of hydropneumatic accumulator communicates with above-piston space of hydraulic cylinder through throttling channel. Spool valve unit consists of three parts. Middle flanged part is secured on flexible diaphragm along its displacement axis. Lower part is made in form of first spool shaped in form of two cones whose tops are pointed towards each other and installed for travel in throttling channel. Upper part is made in form of rod with stops and second spool in form of two cones pointed with their tops outwards installed between rod stops for displacement in throttling channel of rigid partition. End of rod is electromagnetically coupled with electric winding of coil of spool position relative to throttling channels position measuring unit. Valve unit is installed in throttling channel to disconnect flexible portion of spring. EFFECT: enlarged operating capabilities. 1 dwg