Collapsible and breakable transmission shaft

Abstract

The invention provides a collapsible and breakable transmission shaft which has a simple structure and can collapse, absorb energy and automatically break. The transmission shaft is divided into an upper spline and a lower spline, wherein a lower spline shaft is fixed with a lower universal joint assembly; the two ends of an upper spline shaft are sleeved in an upper spline casing and a lower spline casing respectively; the upper end of the lower spline shaft is sleeved in the lower spline casing; the upper end of the upper spline casing is fixedly connected with an upper universal joint fork, and the lower end of the upper spline casing is connected with the lower spline casing through a connecting sleeve made of nylon or plastic; the lower end face of the upper spline shaft and the upper end face of the lower spline shaft are opposite cut oblique planes; the distance from the upper end face of the upper spline shaft to the upper universal joint fork is greater than or equal to the distance from the lower end face of the upper spline shaft to the lower end of the connecting sleeve and less than or equal to the distance from the lower end face of the upper spline shaft to the upper end of the connecting sleeve; and the upper spline shaft is fixed with the upper spline casing and / or the lower spline casing through a positioning pin made of nylon or plastic. The transmission shaft can be automatically broken when an automobile is involved in a collision accident, so that the safety of a driver can be protected.

Description

technical field [0001] The invention relates to the technical field of automobile steering mechanisms, in particular to a breakable transmission shaft. Background technique [0002] At present, automobiles need to be equipped with a set of reliable steering gears, but the current steering gears generally have the following disadvantages: [0003] It can only transmit torque, and the steering shaft can expand and contract under axial force, but if it is also subjected to radial force, the axial expansion and contraction of the intermediate shaft will be greatly affected or even fail; [0004] The current steering transmission shaft cannot be retracted, and when the collision is serious, the steering wheel will move backwards, causing injury to the driver. Contents of the invention [0005] The purpose of the present invention is to provide a breakable transmission shaft with simple structure, which can collapse to absorb energy and disconnect automatically when a car colli...

AI Technical Summary

Problems solved by technology

[0003] It can only transmit torque, and the steering shaft can expand and contract under axial force, but if it is also subjected to radial force, the axial expansion and contraction of the intermediate shaft will be greatly affected or even fail;

[0004] The current steering transmission shaft cannot be extended and retracted, and when the collision is serious, the steering wheel will move backward, causing injury to the driver

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