Suspension gas spring with built-in single capsule

Abstract

The invention discloses a suspension gas spring with a built-in single capsule. The suspension gas spring comprises a cylinder cover, an outer cylinder barrel, an inner cylinder barrel, a piston rod and the capsule; a gas adding opening is formed in the outer cylinder barrel, the inner cylinder barrel is fixed into the outer cylinder barrel through the cylinder cover, and the inner cylinder barrelis internally and movably provided with a piston which partitions the inner cylinder barrel into a firs oil chamber and a second oil chamber; the piston rod extends into the inner cylinder barrel tobe fixedly connected with the piston, the capsule is fixed between the outer cylinder barrel and the inner cylinder barrel, a third oil chamber is formed between the capsule and the inner cylinder barrel, and a gas chamber is formed between the capsule and the outer cylinder barrel; and the third oil chamber communicates with the first oil chamber, the first oil chamber communicates with the second oil chamber, and the gas chamber communicates with the gas adding opening. According to the suspension gas spring, the ground clearance of a vehicle body and the offset frequency of the spring can be maintained unchanged when the static load of a vehicle changes, and consistent riding comfort and controllability can be maintained for both a no-load vehicle and an overload vehicle.

Description

technical field [0001] The invention relates to the field of automobile suspension systems, in particular to a suspension gas spring with a built-in single capsule. 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 damping characteri...

AI Technical Summary

Problems solved by technology

However, in actual use, due to load changes, the static volume of the air chamber will change. Therefore, under different load conditions, the static volume of the air chamber is different, and the spring stiffness is not linearly related to the load mass, causing the spring bias frequency to increase with the load. Increase decreases with decreasing load, no stable bias frequency

Also because the oil flow resistance in the oil pipe is large, limited by 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, but the working pressure of rubber air springs is relatively low, generally around 0.6 MPa, limited by the radial size of the leather bag, the tonnage that can withstand the vehicle load is generally not more than 3.5 tons, There is a defect that the scope of application is narrow

Correspondingly, 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 height of the chassis. However, because the stiffness change is not linearly related to 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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