變(bian)(bian)(bian)(bian)速箱主(zhu)要(yao)指的是汽(qi)車的變(bian)(bian)(bian)(bian)速箱，它分為手(shou)動、自(zi)動兩(liang)種，手(shou)動變(bian)(bian)(bian)(bian)速箱主(zhu)要(yao)由齒(chi)(chi)輪(lun)(lun)和(he)軸組(zu)(zu)成，通(tong)過(guo)不同(tong)的齒(chi)(chi)輪(lun)(lun)組(zu)(zu)合(he)產生變(bian)(bian)(bian)(bian)速變(bian)(bian)(bian)(bian)矩；而自(zi)動變(bian)(bian)(bian)(bian)速箱AT是由液(ye)(ye)力(li)變(bian)(bian)(bian)(bian)扭(niu)器、行星齒(chi)(chi)輪(lun)(lun)、液(ye)(ye)壓變(bian)(bian)(bian)(bian)距系統(tong)和(he)液(ye)(ye)壓操縱系統(tong)組(zu)(zu)成。通(tong)過(guo)液(ye)(ye)力(li)傳遞和(he)齒(chi)(chi)輪(lun)(lun)組(zu)(zu)合(he)的方(fang)式(shi)來(lai)達到變(bian)(bian)(bian)(bian)速變(bian)(bian)(bian)(bian)矩。