What is the function of the vehicle balance tie rod?

The function of the vehicle balance rod is that when the left and right wheels pass through the same bump or hole on the road surface, the balance rod will not work. However, if the left and right wheels pass through different bumps or potholes on the road, that is, the horizontal heights of the left and right wheels are different, it will cause the torsion of the rod body, produce anti-roll resistance and restrain the roll of the car body. That is to say, when the suspension on the left and right sides moves synchronously up and down, the balance bar will not work, and it will only work when the suspension on the left and right sides moves asynchronously due to road undulation or over-bend.

The balance bar will only harden the passability when it moves, unlike the hard spring, which will completely harden the passability. If you want to rely entirely on springs to reduce the roll of the car body, you may need very hard springs, and you should use shock absorbers with high damping coefficient to suppress spring bounce. In this way, it is necessary to bear the sequelae caused by hard springs and shock absorbers, such as road feeling and poor following when passing through uneven roads.

Extended data

Rear-driven vehicles are generally equipped with a balance bar in the front suspension, which can increase the anti-roll ability of the front suspension and reduce the weight transfer of the rear suspension when turning. This will delay or eliminate the phenomenon that the driving wheel (inner wheel) leaves the ground when turning, increase the load of the outer wheel when turning, and enhance the trend of understeer.

Thickening the balance bar will enhance the tendency of oversteering. For the front drive, it is necessary to increase the hardness of the rear balance bar because the driving wheel is at the front wheel, which can improve the tracking performance of the driving wheel and reduce the inherent understeer characteristic of the front drive. However, if the rear wheel will be off the ground when cornering, or the body roll is too serious, it is necessary to consider thickening the balance bar at the front wheel of the front drive to avoid this phenomenon.

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