Passive variable-rigidity longitudinal thrust rod and air suspension for installing longitudinal thrust rod

Abstract

The invention provides a passive variable-rigidity longitudinal thrust rod and an air suspension for installing the longitudinal thrust rod. The longitudinal thrust rod comprises a front lifting ring, a rear lifting ring, a front spring, a rear spring, a working cavity, a supporting rod, a front piston, a rear piston, a piston rod, rubber sleeves, a connecting rod and oil liquid. The air suspension comprises a four-connecting-rod guiding mechanism, a shock absorber, an air spring, a connecting plate and a balance beam. The four-connecting-rod guiding mechanism comprises the two longitudinal thrust rods and a V-shaped rod. Under the emergent acceleration and emergent deceleration working conditions, the rigidity value of the longitudinal thrust rod increases and is equivalent to that of a rigid rod, so that the air spring is protected against longitudinal force, and the stability of an automobile is improved. Under other driving working conditions, the overall rigidity of the longitudinal thrust rod is decreased, and large damping force can be generated when the oil liquid flows through a middle long and thin pipeline, so that the driving smoothness of the automobile is improved. Both the stability and smoothness of the automobile are taken into account under different working conditions. In addition, through the adjustable rigidity and the damping function of the longitudinal thrust rod, the characteristics of the four-connecting-rod guiding mechanisms are further improved.

Description

technical field [0001] The invention belongs to the research field of an automobile air suspension guide mechanism, in particular to a passive variable rigidity longitudinal thrust rod used for the air suspension guide mechanism and an air suspension equipped with the longitudinal thrust rod. Background technique [0002] As people's requirements for car comfort and ride comfort are increasing, people pay more and more attention to air suspension. Air suspension has low stiffness, and the stiffness can change with the load of the vehicle. , the natural frequency of the suspension remains basically unchanged. Therefore, compared with the traditional suspension, the air suspension can further improve the smoothness of the car and make the ride more comfortable. [0003] Because the air suspension uses air springs, it can achieve adjustable stiffness and better ride comfort, but because the air springs can only bear vertical loads, they cannot bear longitudinal and lateral forc...

AI Technical Summary

Problems solved by technology

[0004] There are many forms of guiding mechanism, including leaf spring, four-link, A-frame, etc. At present, the optimization of guiding mechanism is mainly based on the form and layout of the guiding mechanism, and the longitudinal thrust rod is mainly carried out in terms of material and strength. Optimal design, but these designs and optimizations cannot well solve the contradiction between car ride comfort and stability

In the case of rapid deceleration and rapid acceleration, the car needs better stability and protects the air spring from longitudinal force, so the traditional longitudinal thrust rod can protect the air spring and improve the resistance to "nodding" or "head up" by transmitting longitudinal load However, under other working conditions, such as driving at a constant speed, the longitudinal force on the air spring is very small, so the ride comfort of the car becomes the main problem. Since the stiffness of the traditional longitudinal thrust rod is not variable, the vibration caused by the uneven road surface will pass through Longitudinal thrust rods are transmitted to the frame and body, resulting in poor ride quality of the car

In addition, although rubber bushes are installed at both ends of the longitudinal thrust rod in the traditional design to play a limited buffering role, as the number of impacts increases, the rubber bushes are prone to fatigue failure or even fall off, resulting in a decrease in vehicle ride comfort

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