Built-in capsule suspension gas spring

Abstract

The invention discloses a suspension gas spring internally provided with a capsule. The suspension gas spring comprises a cylinder cover, an outer cylinder barrel, an inner cylinder barrel, a piston rod and the capsule. The inner cylinder barrel is fixed into the outer cylinder barrel through the cylinder cover, a piston used for partitioning the inner cylinder barrel into a first oil chamber anda second oil chamber is movably arranged in the inner cylinder barrel, and the piston rod extends into the inner cylinder barrel to be fixedly connected with the piston; a main air chamber and an auxiliary air chamber are arranged between the outer cylinder barrel and the inner cylinder barrel, and the main air chamber is located above the auxiliary air chamber; and the capsule is fixedly arrangedin the main air chamber, a third oil chamber is formed between the capsule and the inner cylinder barrel and communicates with the first oil chamber, and the first oil chamber communicates with the second oil chamber. The suspension gas spring has the most crucial functions that in the vehicle traveling process, the spring rigidity can be actively changed according to the needs of the vehicle traveling road condition, inclination and the roll angle of a vehicle are reduced significantly at the time of emergency braking and sharp turn, and thus safe traveling and reliable manipulation of the vehicle are achieved.

Description

Technical field [0001] The invention relates to the field of automobile suspension systems, in particular to a built-in capsule suspension gas spring. Background technique [0002] 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 bars, Parts such as steering knuckle arm, rubber bushing and connecting rod. When a car is driving on the road, it is subject to vibrations and shocks due to changes in the ground. Part of the force of these shocks is absorbed by the tires, but most of it is absorbed by the suspension between the tires and the body. [0003] In the automobile suspension system, the hydro-pneumatic spring is a suspension elastic damping element with excellent performance. It is the core part of the hydro-pneumatic suspension. It has both damping characteristics and nonlinear ...

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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