變(bian)(bian)(bian)(bian)(bian)速箱(xiang)主要(yao)指的(de)(de)是汽車(che)的(de)(de)變(bian)(bian)(bian)(bian)(bian)速箱(xiang)，它(ta)分為手(shou)動(dong)、自動(dong)兩種(zhong)，手(shou)動(dong)變(bian)(bian)(bian)(bian)(bian)速箱(xiang)主要(yao)由齒(chi)(chi)輪(lun)(lun)和(he)軸組(zu)(zu)(zu)成，通過不同的(de)(de)齒(chi)(chi)輪(lun)(lun)組(zu)(zu)(zu)合產生(sheng)變(bian)(bian)(bian)(bian)(bian)速變(bian)(bian)(bian)(bian)(bian)矩；而自動(dong)變(bian)(bian)(bian)(bian)(bian)速箱(xiang)AT是由液力(li)變(bian)(bian)(bian)(bian)(bian)扭器、行星齒(chi)(chi)輪(lun)(lun)、液壓變(bian)(bian)(bian)(bian)(bian)距系統和(he)液壓操(cao)縱系統組(zu)(zu)(zu)成。通過液力(li)傳遞(di)和(he)齒(chi)(chi)輪(lun)(lun)組(zu)(zu)(zu)合的(de)(de)方式來達(da)到變(bian)(bian)(bian)(bian)(bian)速變(bian)(bian)(bian)(bian)(bian)矩。