Cab suspension refers to the suspension system composed of spring damping elements, which suspends the cab on the frame. At present, cab suspension system mainly includes fully floating cab and semi-floating cab according to its structure. 
The fully floating cab, that is, the cab is suspended on the frame by a suspension system composed of four groups of elastic elements at front, rear, left and right. 
Compared with the fully floating cab, the two supporting points at the front of the semi-floating cab are hinged to the frame, and the rear suspension structure is also connected to the frame by a rear suspension composed of springs and damping elements. 
In addition to distinguishing the cab suspension system according to the structural form, it can also be divided according to the elastic elements adopted by the suspension structure, mainly including: Spiral spring cab suspension, leaf spring cab suspension, air spring cab suspension, etc.