What is the function of torsion core?

In order to make the balanced suspension of two-axle truck have good performance, the balanced suspension system often uses torsion rubber core with reaction force to connect the rear axle and the frame. When the balance suspension moves up and down, the torque rubber core at both ends of the thrust rod is stressed and produces elastic deformation to reduce the interference of vibration and external force, play a buffer role, and make the vehicle drive stable. In the prior art, the shaft body of the torque rubber core is mostly configured on the rubber core body through the needle roller bearing, which is difficult to withstand large deformation, especially when the middle and rear axle shake around, the needle roller bearing is easy to jam, and even cause the torque rubber core to break, degumming, etc., and the assembly and maintenance of such a structure are very inconvenient.