Piston diameter changeable air spring

Abstract

The invention discloses a piston diameter changeable air spring. The piston diameter changeable air spring comprises a cover plate, a rubber air bag and a piston assembly. The rubber air bag is pressed and assembled to a lower port of the cover plate, and a lower port of the rubber air bag is pressed and assembled to the piston assembly. The piston assembly comprises a hollow columnar piston framework, a piston ejector rod arranged at the bottom of the piston framework in a sliding fit manner, and a plurality of piston sections evenly and movably hinged to the circumferential wall of the piston framework in the circumferential direction. The piston ejector rod and the middle portion of each piston section are movably hinged through a connecting rod, and a plurality of slider-crank mechanisms are formed. According to the piston diameter changeable air spring, an actuating mechanism can be used for changing the position of the piston ejector rod in the piston assembly to expand the piston sections, accordingly, the diameter of the piston and the effective diameter of the air spring are adjusted, and through combined action with a car body height adjusting mechanism, the bearing rigidity of the air spring can be changed under the situation that the bearing weight is not changed.

Description

technical field [0001] The invention belongs to the technical field of air spring products for automobile suspension, in particular to an air spring with variable piston diameter. Background technique [0002] The existing vehicle air spring structure is mainly composed of a cover plate, a rubber air bag, and a piston, wherein the shape of the piston is fixed. Experimental research shows that the relationship between air spring force and compression is as follows: Figure 8 As shown, the intervals of the characteristic curves under various air pressures are approximately equal, and the curves are highly overlapped after the air pressure is normalized. This explains: [0003] (1) When other conditions remain unchanged, there is a direct proportional relationship between bearing capacity and stiffness and air pressure. [0004] (2) When the bearing capacity is constant, the stiffness of the air spring changes year-on-year with the bearing capacity. [0005] This means that ...

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Problems solved by technology

[0005] This means that the stiffness of the air spring changes passively with the load, and its size is determined by the load of the vehicle. This characteristic makes the bias frequency of the air suspension basically unchanged, but when the load of the vehicle is constant , it is impossible to effectively adjust the stiffness characteristics of the air spring, and it is impossible to realize the suspension variable stiffness control in the true sense

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