The working principle of the torsion bar suspension is actually very simple.

It mainly relies on the torsional deformation of the torsion bar to provide elastic travel for the vehicle.

The torsion bar is usually tubular. One end is engraved with splines to be fixed to the frame, and the other end is connected to the balance elbow.

When a vehicle is traveling on an uneven road surface, the wheels will move up and down. At this time, the balance elbow connected to the wheels will drive the torsion bar to twist.

The torsion bar absorbs and disperses the impact and vibration caused by uneven roads through its own torsion.

For example, the protrusion on the ground will cause the wheels to move upward, thereby causing the torsion bar to twist. The torsion bar converts this impact force into torsional energy.

And when the wheel passes through the protrusion, the torsional energy stored in the torsion bar will be released to help the wheel return to its original position.

In this way, shock absorption and stability of the vehicle during driving are achieved.

The advantages of the torsion bar are also quite obvious. It is small in size and won't take up too much space. Moreover, it has a large moving stroke and can adapt to a relatively large up and down displacement of the wheels.

In conclusion, the torsion bar suspension achieves the function of absorbing shock and maintaining smooth vehicle operation through the torsion and deformation of the torsion bar.