VEHICLE SUSPENSION PNEUMOHYDRAULIC SPRING Russian patent published in 2008 - IPC B60G11/26 F16F5/00 

FIELD: transport engineering; suspensions.

SUBSTANCE: invention relates to pneumohydraulic springs with self-adjustable hydraulic resistance depending on amplitude and frequency of oscillations. Proposed pneumohydraulic spring of vehicle suspension contains cylinder with fitted-in piston and rod forming in cylinder piston and rod spaces, and hydraulic accumulator connected with cylinder space through valve. Valve is made in form of damping unit self-adjustable in amplitude and frequency of oscillations depending on pressure in spring and its change in time. Channel is made in valve body which accommodates spring-loaded step plunger forming with valve body, overplunger space, underplunger space and ring plunger space communicating with piston space and connected with space of hydraulic accumulator through main throttling channel with higher resistance and additional throttling channel with lower resistance, overlapped by larger step of plunger in extreme upper position. Spring installed in overplunger space engages with smaller step of plunger. Check valve installed in larger step of plunger connects ring plunger space with under plunger space. Outer groove made on lower part of plunger larger step communicates with ring plunger space through longitudinal throttling slot made on outer surface of plunger larger step, and with underplunger space through radial holes and filter installed in outer groove. Invention provides new damping system automatically self-adjustable in amplitude and oscillation frequency depending on pressure in spring and its changes in time and increase in damping force with rise of amplitude of oscillations over travel of suspension at any frequencies of road actions.

EFFECT: improved smoothness at any frequencies of road actions when riding practically along roads of any type.

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