Suspension system with a level control device

The suspension unit (1) is mounted between the wheels (2) and bodywork (3) using a vertical sliding wheel connection (7). It consists of a helical spring (4) and reversible electric jack (5) which are connected in parallel. The jack uses a rack and pinion mechanism (50,51,52) and exerts forces which attenuate the separation speed between wheels and body and also correct the attitude of the suspended body.