VEHICLE PNEUMOHYDRAULIC SPRING Russian patent published in 2005 - IPC

FIELD: transport engineering; spring.

SUBSTANCE: proposed pneumohydraulic spring contains 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. Groove of rod made in its lower part connects overpiston space with counterpressure chamber when vehicle is not loaded. Spring is furnished with damping unit, self-adjusting depending on amplitude of vibrations and changes of pressure, including main throttling channel made on lower end of tube, additional throttling channel formed in lower part of tube by radial holes and outer groove, and spring-loaded plunger made in form of step sleeve installed on tube and provided with radial holes in smaller step. Larger step forms sealed ring plunger space with tube which accommodates compression spring of plunger overlapping by its smaller step additional throttling channel at stroke of piston out of zone of rod groove as a result of sharp increase or decrease of pressure in counterpressure chamber. Counterpressure chamber communicates with ring space through additional tube with check valve.

EFFECT: improved smoothness of riding.

2 dwg