The invention relates to a structure of an energy-absorbing motor
steering column. The mandrel of the
steering column comprises an upper section and a lower section which are connected with each other by a spline, a protection tube is installed outside the upper section of the mandrel, a column shell is installed outside the lower section of the mandrel, a
bushing is arranged between the inner wall of the upper section of the column shell and the outer wall of the lower section of the protection tube, and the
bushing is limited and fixed along the axial direction; the lower end of the protection tube is provided with a convex part which is matched with a guide groove on the
bushing, the side of the guide groove is provided with a shrinkage groove, in which the guide groove can stretch, and the column shell, the bushing and the protection tube are connected and fixed by pins; relative sliding does not occur between the upper section of the mandrel and the lower section thereof under the normal condition by using the pins to support the protection tube; when the pins are
cut to be short since the automobile collides, the protection tube and the upper section of the mandrel are guided to move downwards along the guide groove by the convex part arranged at the lower end of the protection tube, so that the
impact energy is transferred to the bushing. By the improvement of the mechanism, the whole
steering column is closed, has simple and compact structure as well as stable
energy absorption, and can still have steering operation when being collided.