Automobile Suspension Double Capsule Variable Stiffness Gas Spring

Abstract

The invention discloses a vehicle hanger bracket double-capsule alter-rigidity gas spring. The spring comprises a cylinder cover, an outer cylinder tube, an inner cylinder tube, a piston rod, an uppercapsule and a lower capsule, wherein the inner cylinder tube is fixed in the outer cylinder tube through the cylinder cover, the inner cylinder tube is internally movably provided with a piston usedfor separating the inner cylinder tube into a first fuel chamber and a second fuel chamber, an on-off control part is fixedly arranged on the piston, the piston rod is fixedly connected with the piston; a main air chamber and a secondary air chamber are formed between the outer cylinder tube and the inner cylinder tube; the upper capsule is fixed in the main air chamber, a third fuel chamber is formed between the upper capsule and the inner cylinder tube, the lower capsule is fixed in the secondary air chamber, a fourth fuel chamber is formed between the lower capsule and the inner cylinder tube; the third fuel chamber is communicated with the first fuel chamber, and the fourth fuel chamber is communicated with the second fuel chamber or the fourth fuel chamber is communicated with an external fuel tube. The most critical function of the vehicle hanger bracket double-capsule alter-rigidity gas spring is that a vehicle can actively change the spring stiffness according to the driving road condition requirements during driving so as to greatly reduce the nodding and heeling angle of the vehicle, thereby achieving the safe driving and reliable control of the vehicle.

Description

technical field [0001] The invention relates to the field of automobile suspension systems, in particular to an automobile suspension double capsule variable stiffness gas spring. Background technique [0002] The automobile suspension system refers to a connecting structural system between the body, frame and wheels, and this structural system includes shock absorbers, suspension springs, anti-roll bars, suspension sub-beams, lower control arms, longitudinal rods, Components such as knuckle arms, rubber bushes and connecting rods. When the car is running on the road, it is subject to vibrations and impacts due to changes in the ground. Part of the impact force will be absorbed by the tires, but most of it is absorbed by the suspension device between the tires and the vehicle body. [0003] In the automobile suspension system, the oil-gas spring is a suspension elastic damping element with excellent performance. It is the core part of the oil-gas suspension. It has both dam...

AI Technical Summary

Problems solved by technology

However, since the volume of the air chamber of the oil-pneumatic spring only corresponds to the load and cannot be actively changed, the spring stiffness cannot be actively changed during the driving of the vehicle.

Moreover, when the vehicle body is raised and lowered, due to the large flow resistance of the oil in the oil pipe and the limitation of the diameter of the valve, the lifting speed of the vehicle chassis is slow.

[0005] In addition, the existing automobile suspension often uses rubber air springs. The spring suspension system also has the performance of maintaining the height of the body when the body lifts and load changes by inflating and deflating the airbags, but the working pressure of the rubber air springs is low. , generally around 0.6MPa, the relatively large outer diameter of the airbag is not conducive to the arrangement on the car suspension. At the same time, it is difficult to change the volume of the air chamber to change the spring stiffness, and the cost is also high. There are only a few air suspensions for luxury passenger cars. With such a function, it is difficult to realize such a function on a commercial bus

In addition, when the vehicle load changes greatly, the air pressure in the airbag changes, the outer diameter of the airbag changes, and the pressure-bearing area of ​​the piston will change accordingly. Therefore, although the load changes, the air pressure in the airbag can be adjusted to maintain the chassis height. However, because the stiffness change does not have a linear relationship with the load mass, the smaller the load, the larger the bias frequency, and the larger the load, the smaller the bias frequency, there is still the defect that the suspension bias frequency is unstable

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