( 2 ) taking the vehicle platform variant as precondition , this paper deeply researches the function - structure and function - structure decomposition of rear - axle . the rear - axle product model for variant design is built using general cad software ( unigraphics ) ( 2 )以滿(mǎn)足平臺(tái)改型設(shè)計(jì)需求為前提,深入研究了汽車(chē)后橋的功能結(jié)構(gòu)和功能結(jié)構(gòu)分解,利用通用cad軟件( unigraphics )建立了適應(yīng)變型設(shè)計(jì)的汽車(chē)后橋產(chǎn)品模型。