In the rack and pinion steering system, the accuracy and meshing degree of the steering rack are relatively important, and the steering system is an important assembly that determines the active safety of the car. Poor accuracy of the steering rack can cause insensitivity and unstable handling, requiring a significant rotation of the steering wheel, which not only affects the comfort of the car's operation, but can also lead to steering system malfunctions and accidents. The rack and pinion steering system is a commonly used steering mechanism in cars and small trucks, and the automotive steering rack is an important component of the rack and pinion steering system. 

 

　　

Its working principle is simple. The rack and pinion gear set is wrapped in a metal tube, and each tooth end of the rack protrudes outside the metal tube and is connected together by a tie rod. A small gear is connected to the steering shaft, and when the car steering wheel is turned, the steering gear rotates, causing the meshing rack to move along the axial direction. On the steering arm of the steering shaft of the tie rod at each tooth end of the rack, the rotation of the steering wheel is converted into linear motion required for wheel transmission through the rack, so that the left and right tie rods drive the steering joint to rotate left and right, enabling the steering wheels to deflect and achieve vehicle steering.

What are the design and application situations of gear shafts for rack and pinion machining. The gear shafts that can be seen in daily life generally vary depending on their purpose. This is closely related to its own design. In terms of classification, it can generally be divided into drive shaft, rotary shaft, and spindle. The shafts designed in different styles have different purposes and characteristics.

Generally speaking, the design of gear shafts uses small gears, and the characteristic of this type of gear is that the number of teeth on the gear is relatively small. If it is a high-speed gear, then it is also some low torque gears. In some special occasions, variable speed sliding gears are also used, which are rarely used because if it is at high speed, the sliding variable speed gears cannot handle it at all. When designing, designers usually try to shorten the length of the shaft as much as possible, because if the shaft length is too long, the difficulty of machining on the gear hobbing machine will also increase. Moreover, the strength of the components may also be adversely affected due to the length being too long.