What does the lower track bar assembly do

The function of the lower track bar assembly is to support the kinematics and dynamics characteristics of the air suspension system. In the operation of the air suspension model, the air spring mainly plays the role of bearing the vertical load, while the transmission of the longitudinal force, the transverse force and the moment is borne by the guiding mechanism.
Air suspension is a kind of suspension structure connected by air bag. The biggest feature of air suspension is the elastic connection between the body part and the axle part.
The air suspension not only effectively transmits the force and torque between the body and the axle, but also can buffer the reverse impact of the road on the body, thereby improving the handling stability, smoothness and comfort of the vehicle.
The air suspension system is mainly composed of track bar assembly (guiding mechanism), air bag assembly (elastic element), shock absorber assembly (damping element), height control system, etc.
Among them, the heavy truck air suspension must also increase the lateral stabilizer bar assembly (stability device).
track bar assembly (guide mechanism) Guide mechanism supports the kinematics and dynamics characteristics of the air suspension system. In the operation of the air suspension model, the air spring mainly plays the role of bearing the vertical load, while the transmission of longitudinal force, transverse force and torque is borne by the guide mechanism.
There are two types of guide components for heavy commercial vehicles: guide arm and guide spring. The guide arm has two kinds of structure: track bar and integrated molding. The rubber ball at both ends of the track bar structure is more flexible than the rubber ball. The integrated guide arm is composed of track bar and stabilizer rod. The front end of the guide plate spring structure is connected to the frame to carry the load, and the back end is connected to the air spring, which is mainly used in the composite air suspension. There are four common guiding mechanisms: a, single longitudinal arm structure The front suspension guide arm of the single longitudinal arm structure is longer, which is conducive to stabilizing the rear Angle of the kingpin, increasing the automatic righting function, and improving the vehicle's controllability. The air suspension of this structure can not only reduce the center position of the longitudinal overturning moment of the vehicle, but also increase the anti-overturning ability of the vehicle itself.
b, leaf spring structure Because the leaf spring structure belongs to the increase of air spring at one end of the leaf spring structure, this structure not only maintains the elastic characteristics of part of the leaf spring structure, but also increases the characteristics of the air spring.
c, double cross arm structure for double cross arm structure because the upper and lower arm length arrangement is reasonable, so that the vehicle has good stability, but its structure is complex, and the stress point is concentrated, the carrying capacity is weak.
d, double longitudinal arm structure Double longitudinal arm structure above the two longitudinal thrust to form a tripod structure, through the tripod structure and the following two longitudinal track bars, to form a four-link mechanism, this structure can be longitudinal transmission force, can also be lateral transmission force.
Air bag assembly (elastic element) - Air spring Air spring: Through the action of compressed air in the air bag to achieve the spring action of the air spring. The air spring plays a better elastic role in the suspension. The stiffness of the air spring is variable with the change of load and working condition, so it can obtain more reasonable elastic characteristics in actual use. Compared with the traditional leaf spring structure, the air spring mainly has the following advantages, on the one hand, the stiffness of the air spring is variable, its stiffness can increase with the increase of load mass, and in a continuous gradual increase process, while the stiffness of the leaf spring is graded;
Second, it is highly adjustable, and the air spring can be extended or compressed with the change of air pressure in the air bag, so that the height of the frame or the body can be adjusted.