Steering gear gap adjustment mechanism

Abstract

The invention aims to provide a steering gear gap adjustment mechanism which can effectively reduce abrasion among parts and is small in occupied space. The steering gear gap adjustment mechanism comprises a steering input gear shaft and a rack which are mutually engaged; a pressing block and an adjustment screw plug are provided with concave parts with openings being opposite; the two concave parts are in butt joint to constitute a chamber; the chamber is internally provided with a spiral spring; one end of the spiral spring abuts against the pressing block, and the other end of the spiral spring abuts against the adjustment screw plug; the chamber is further internally provided with a damping unit; the end of a piston rod of the damping unit abuts against the pressing block; and the pressure in a valve cavity of the damping unit drives the piston rod to move towards the pressing block. When the rack overcomes resistance of the spiral spring and the pressing block and continues to move towards the adjustment screw plug, resistance generated by a mixture in the first valve cavity prevents the rack from continuing to move, thus the pressing block and the adjustment screw plug are made to make slow contact with each other through reaction force generated by compression of the spiral spring and compression of the damping unit to avoid impact of the pressing block and the adjustment screw plug with great energy, and therefore, the abnormal sound problem can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of automobile steering systems, in particular to a steering clearance adjustment mechanism. Background technique [0002] With the development of the automobile market, people have higher and higher requirements for the comfort of passenger cars, and they are also more and more sensitive to the abnormal noise generated when the vehicle changes direction or goes over a bumpy road. The rack and pinion steering gear with tie rod assembly is an important component of the car. With the long-term driving of the car, the parts of the steering gear will wear out due to relative movement, and the gap between the parts will also Then it becomes larger, so it is easy to produce abnormal noise, and even reduce the performance of the steering system, which affects the performance of the vehicle and also affects the driving comfort of the driver. [0003] At present, the internal rack of the pinion and rack type steering...

AI Technical Summary

Problems solved by technology

At present, the adjustment structure adopted by the gear shaft and rack type steering gear mainly solves the problem of gear shaft teeth by adjusting the stiffness of the coil spring 4 or adjusting the compression amount of the coil spring 4 to change the pressing force applied to the pressure block 3 and other parameters. However, the adjustment of the spring parameters will inevitably change the parameters such as the diameter and length of the coil spring 4. If the parameters such as the diameter or length of the coil spring 4 change little, the pressure of the coil spring 4 will The pressing force exerted by block 3 does not change much, and the improvement of the abnormal noise will not be obvious, but if the diameter or length of the coil spring 4 changes greatly, although the pressing force will increase, the space occupied by the coil spring 4 will also increase. This is not conducive to the arrangement of the pinion and rack steering gear on the vehicle

Once there is wear between the parts and the fit gap increases, this structure cannot perform gap compensation in the future, and the abnormal noise will only become more and more obvious

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