Parametric modeling of automotive rack and pinion steering gear parts

General products are composed of one or many parts. In order to realize the parametric design of products, we must first realize the parametric design of parts. Generally, firstly, the parametric modeling and analysis of parts are carried out; Then the parametric modeling method is determined according to the characteristics of the parts, and the parametric modeling of the parts is carried out; Finally, the parts are assembled parametrically, constrained and added with necessary rules and inspections. Taking CATIA software as the parametric design platform, the parametric three-dimensional model of automotive rack and pinion steering gear parts is established.

As an important rotating part of car, automobile steering gear is mainly composed of steering gear shaft, adjusting nut, centripetal ball bearing, needle roller bearing, fixing bolt, tie rod, steering gear housing, dust boot, steering rack, adjusting screw plug, lock nut, compression spring, pressure block, bearing cover and other parts. As the steering gear and steering rack are the core components of the steering gear and their structure and shape are complex, it brings great difficulties to the design and manufacture. However, CATIA software can realize the parametric modeling of components and parts, save the modeling time, and carry out parametric modeling and analysis of the steering gear and steering rack.

The gear in the car rack and pinion steering gear is an involute gear with special helical shape and large helical angle. In order to improve the transmission ratio, the number of teeth of rack and pinion steering gear is very small. Most gears adopt helical gears to reduce the undercutting of gears, increase the strength of gears, improve the meshing overlap coefficient and reduce the reverse transmission efficiency. The gear in rack and pinion steering gear requires high sensitivity of transmission, and its design and manufacturing requirements are also very strict.

Compared with the straight gear, the helical gear rotates by an angle at both ends of the helical gear. If the rotation angle is zero, the helical gear is a straight gear, so the straight gear is a special helical gear with zero helix angle. We can draw spur gear and helical gear with the same drawing method. We can output different spur gear or helical gear only by changing the end face parameters.

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