In rack and pinion steering, the steering gear, which is the active part of the transmission, is mounted in the housing and engages with the horizontally arranged steering rack. The spring presses the rack against the steering gear by means of a pressure block to ensure a backlash-free engagement. The preload of the spring can be adjusted with the adjusting screw. >> In operation, the middle of the steering rack is connected with the steering rod bracket, and the steering left and right horizontal tie rods are connected with the steering knuckle arms.
Compared with other forms of steering gears, the main advantages of rack and pinion steering gears are: simple and compact structure; the shell is made of aluminum alloy or magnesium alloy die-casting, and the mass of the steering gear is relatively small; the transmission efficiency is as high as 90%; after the gap between the gear and the rack appears due to wear, the gap between the teeth can be automatically eliminated by using the spring with adjustable compression force installed at the back of the rack, near the active pinion.
As shown in 1, this can not only improve the stiffness of the steering system, but also prevent the impact and noise when working; the volume occupied by the steering is small; there is no steering rocker arm and straight tie rod, so the steering wheel angle can be increased; the manufacturing cost is low. The backlash phenomenon will make the driver nervous and difficult to accurately control the direction of the car, and the sudden rotation of the steering wheel will cause the driver to hit the hand, causing injury to the driver. Three forces: tangential force radial force axial force 1, tangential force >> >> main wheel force to the opposite wheel recoil with the steering
2, axial >> >> to the relationship with the spiral to determine the gear rotation (simple gear axis and surface perpendicular view >> >> >> >> >> trend left high left rotation with the left hand then thumb pointing both axial force to the opposite also - judgment >> >> actually with complex)
3、Radial >> >> >> Slightly
4, force calculation force combined with the solution to understand the helix angle, pressure angle concept easy to solve.