VEHICLE PNEUMOHYDRAULIC SPRING Russian patent published in 2006 - IPC B60G11/26 F16F9/06 

FIELD: transport engineering; suspensions.

SUBSTANCE: proposed pneumohydraulic spring has cylinder with upper and lower covers filled with liquid and gas, piston with hollow rod which accommodates counterpressure chamber communicating through tube with ring space between walls of cylinder and hollow rod, and rod with groove secured in upper cover of cylinder and arranged in central hole of piston. Grove of rod made in lower part communicates overpiston space with counterpressure chamber when vehicle is non-loaded. Spring is furnished with damping unit self-adjustable depending on amplitude of vibrations and degree of vehicle load and including main restrictor channel made on lower end of tube, additional restrictor channel formed by radial holes made in lower part of tube, and spring-loaded plunger installed on lower end of tube and overlapping radial holes at interaction with lower end face of rod when vehicle is loaded. Tube hole opening in ring space is made in hollow rod lower than lower end face of piston, and it is overlapped by lower cover at end of rebound stroke. Variable-section longitudinal slot is made between lower end face of piston and inlet hole of tube on outer surface of hollow rod. Said slot increases nonelastic resistance at end of rebound stroke of spring at overlapping of inlet hole of tube. Counterpressure chamber communicates with ring space through additional tube with check valve whose inlet hole is made in hollow rod directly under lower end face of piston.

EFFECT: improved smoothness of riding.

2 dwg