The virtual assembly process is that the user changes the manual assembly operation process of the specified automobile rack and pinion steering device into the automatic assembly operation process of the system software. That is, users do not need to carry out the traditional manual assembly, but automatically identify the relationship and constraints between products through the system software, and automatically realize the automatic assembly of part elements through the relationship and constraints between products. Therefore, the assembly process is simplified. Finally, through interference analysis and inspection, the deficiencies in the assembly process are fed back from time to time, and the virtual assembly of the whole automobile rack and pinion steering gear is completed.
According to the principle of virtual assembly, the process of virtual assembly of automobile rack and pinion steering gear is as follows: firstly, according to the design requirements of automobile rack and pinion steering gear parts, the three-dimensional parametric modeling of parts and components is carried out by using the part design module in CATIA software; Then in the CATIA software assembly design module, the assembly module is established according to the assembly mode of automobile rack and pinion steering gear, and all components and parts are added to obtain the assembly relationship; Then, in the CATIA virtual assembly environment, according to the assembly conditions and cooperation relationship between the components of the automobile rack and pinion steering gear, the necessary constraint relationship is added to the assembly of the automobile rack and pinion steering gear; Finally, the interference analysis and inspection of the virtual assembly of the automobile rack and pinion steering gear are carried out, the design and assembly methods are analyzed, and the unreasonable design or assembly relationship is modified. Finally, the virtual assembly of the automobile rack and pinion steering gear is completed.
Through the in-depth analysis of the structural characteristics and the assembly relationship of various parts of the automobile rack and pinion steering gear, the automobile rack and pinion steering gear is divided into three sub assemblies: the assembly of the steering rack and the steering gear housing, the assembly of the steering gear shaft as a whole, and the assembly of the steering gear shaft and the steering gear housing.
(1) Assembly of steering rack and steering gear housing: including steering rack, locking screw, compression spring and steering gear housing.
(2) Overall assembly of steering gear shaft: including steering gear, deep groove ball bearing, needle roller bearing and bearing cover.
(3) The whole steering gear shaft is assembled with the steering gear housing: including the whole steering gear shaft, locking spring, pressing plate and steering gear housing.
During the sub assembly of steering rack and steering gear housing, first install the steering rack in the steering gear housing, then install the pressing plate into the steering gear housing, then install the compression spring into the steering gear housing, and finally assemble the steering gear housing, baffle and locking screw. During the overall sub assembly of the steering gear shaft, first install the needle roller bearing at the lower end of the steering gear shaft, install the bearing cover, and then install the deep groove ball bearing at the upper end of the steering gear shaft. When sub assembling the steering gear shaft and the steering gear housing, first install the pressing plate into the steering gear housing, then install the locking spring into the steering gear housing, and finally install the steering gear shaft into the steering gear housing as a whole. Finally, assemble the three sub assemblies of the steering gear one by one, which is the overall assembly of the steering gear.