VEHICLE SUSPENSION PNEUMOHYDRAULIC SPRING Russian patent published in 2003 - IPC

FIELD: transport engineering. SUBSTANCE: invention relates to pneumohydraulic springs with self-adjusting hydraulic resistance depending on amplitude and direction of vibrations. Proposed pneumohydraulic spring of vehicle suspension contains cylinder which accommodates piston with rod forming piston and ring-spaces in cylinder, and hydraulic accumulator connected with cylinder space through valve made in form of damping unit self- adjusting depending on amplitude and direction of vibrations. U-section plunger is installed in valve housing for axial displacement and forming overplunger and underplunger spaces interconnected through main throttling channel made in plunger partition and featuring high resistance. Safety valve installed in plunger communicates underplunger and overplunger spaces at large pressure differentials. Two axial holes made in valve housing form additional throttling channel featuring low resistance. One of axial holes connects overplunger space with piston space, and the other connects underplunger space with hydraulic accumulator. Invention creates new automatic control damping system providing reduction of hydraulic resistance at slight vibrations and limiting maximum damping at compression and rebound strokes. EFFECT: improved stability of damping characteristics of spring improved smoothness of vehicle running. 2 dwg