Energy-absorbing motor steering column

Abstract

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.

Description

technical field [0001] The invention relates to automobile steering technology, in particular to a structure of an energy-absorbing automobile steering column. Background technique [0002] In a serious traffic accident of a car, once the front end of the car is collided, the engine compartment, etc. move backward, the distance between the steering wheel and the driver's seat suddenly shrinks, and the driver is caught in the middle and injured. In order to minimize the occurrence of such injuries, it is required The steering column has the function of energy absorption protection. [0003] For example, Chinese invention patent application publication CN101254794A discloses an energy-absorbing steering column for automobiles. This steering column is composed of three parts: a steering column tube, a steering shaft, and a steering bracket. The steering shaft is composed of an upper half shaft and a lower half shaft, and the steering bracket is composed of an upper bracket and...

AI Technical Summary

Problems solved by technology

[0004] This kind of energy-absorbing device needs to open a rectangular opening on the upper column wall of the steering column to make a curled friction plate, which reduces the strength of the upper column, and makes it easy for dust and other sundries to enter the steering column through the rectangular opening; The column needs to be fixed in the cockpit through the upper and lower brackets, which increases the installation workload; in addition, after the upper steering shaft is retracted downward, the steering device of the car cannot be used for steering operations, which has a great impact on the handling work after the accident. Inconvenience

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