PNEUMOHYDRAULIC SPRING Russian patent published in 1999 - IPC

FIELD: pneumohydraulic springs for cushioning heavy-duty transport facilities. SUBSTANCE: pneumohydraulic spring includes main cylinder with cover, piston with rod forming circular cavity connected with cavity of hollow rod through hole in piston and maximum release stroke valve. Wall of hollow rod has radial holes: one hole is used for mounting the throttle valve and other hole is used for mounting the check valve which communicate circular cavity with cavity of hollow rod; they are shut off by means of cover at the end of release stroke, thus forming low-pressure cavity at compression stroke and creating pressure differential. Seal of hollow rod is made in form of single-acting collar. Level of liquid is above piston when spring is in compressed state. EFFECT: improved elastodampening properties and automatic return of leakage. 1 dwg