The working principle of rack and pinion power steering gear

In the rack-and-pinion steering gear, the steering gear, which is the driving member of the transmission pair, is installed in the housing and meshes with the horizontally arranged steering rack.The spring presses the rack against the steering gear through the pressure block to ensure backlash-free meshing.The preload of the spring can be adjusted with the adjusting screw. >> When working, the middle part of the steering rack is connected with the steering rod bracket, and the left and right tie rods are connected with the steering knuckle arm.

Compared with other forms of steering gear, the main advantages of rack and pinion steering gear are: simple and compact structure; the shell is made of aluminum alloy or magnesium alloy die-casting, the quality of the steering gear is relatively small; the transmission efficiency is as high as 90%; After the gap occurs between the rack and the rack due to wear, the spring installed on the back of the rack and close to the driving pinion can be used to adjust the pressing force to automatically eliminate the gap between the teeth.

As shown in Figure 1, this can not only improve the rigidity of the steering system, but also prevent shock and noise during operation; the steering gear occupies a small volume; there is no steering rocker arm and straight rod, so the steering wheel angle can be increased; low manufacturing cost.The phenomenon of recoil will make the driver nervous, and it is difficult to accurately control the driving direction of the car. The sudden rotation of the steering wheel will cause thugs and cause damage to the driver.Three forces: tangential force, radial force, axial force

2. Axial >> >> The relationship between the direction and the helical direction is used to determine the rotation direction of the gear (simple gear axis and the plane are perpendicular to the view >> >> >> >> >> The left hand is high and the left hand is used, and the thumb points to the opposite direction of the axial force. Also-judgment >> >> Its practical use is complicated)

3. Radial >> >> >> Slightly

4. Force calculation and solution of force It is easy to understand the concepts of helix angle and pressure angle.