What Is The Function Of Steering Rack?2022 Latest Explanation

It is the most important part of the steering system of a car. But many people do not understand the function of the steering rack.

Do you have the same confusion when choosing or repairing a steering gear? If your answer is yes, then please read my article, I hope it will help you!

What Is The Function Of Steering Rack?

The function of the steering gear is to increase the force transmitted from the steering wheel to the steering transmission mechanism and to change the direction of force transmission.

1 Introduction of the car steering rack

Automotive steering gear, also known as steering machine and steering gear, is the most important part of the steering system of an automobile. Its function is: to increase the force transmitted from the steering wheel to the steering transmission mechanism and to change the direction of force transmission.

2 Classification of automotive steering gears

Rack and pinion steering rack: It is the most common type of steering gear. Its basic structure is a pair of pinion and racks that mesh with each other. When the steering shaft drives the pinion to rotate, the rack makes a linear motion. Sometimes, the rack can drive the cross-road directly to make the steering wheel steer. Therefore, this is the simplest type of steering gear. It has the advantages of simple structure, low cost, sensitive steering, small size, and can directly drive the cross tie bar. It is widely used in automobiles.

Worm gear crankpin steering rack: It is a steering gear with worm gear as the active part and crankpin as the follower. The worm has a trapezoidal thread, and the finger-like tapered finger pin is supported by a bearing on the crank, and the crank is made integral with the steering rocker shaft. When steering, the worm is rotated by the steering wheel, and the conical finger pin embedded in the spiral groove of the worm rotates itself while making a circular motion around the steering rocker shaft, thus driving the crank and the steering arm to swing, and then deflecting the steering wheel through the steering transmission mechanism. This kind of steering gear is usually used in vehicles with large steering forces.

Circulating ball steering system: The main structure of the circulating ball power steering system consists of two major parts: the mechanical part and the hydraulic part. The mechanical part consists of shell, side cover, upper cover, lower cover, recirculating ball screw, rack nut, rotary valve spool, and fan tooth shaft. There are two pairs of transmission pairs: one pair is the screw and nut, and the other pair is the rack, tooth fan, or fan tooth shaft. Between the screw and the rack, the nut is equipped with a steel ball that can be cyclically rolled, so that the sliding friction becomes rolling friction, thus improving the transmission efficiency. The advantage of this kind of steering is that it is light to operate, has low wear, and long life. The disadvantage is that the structure is complicated, the cost is higher, and the steering sensitivity is not as good as the rack and pinion type.