變(bian)(bian)速(su)箱(xiang)主要指的(de)是(shi)(shi)汽車的(de)變(bian)(bian)速(su)箱(xiang)，它分為手(shou)動(dong)、自動(dong)兩種，手(shou)動(dong)變(bian)(bian)速(su)箱(xiang)主要由齒(chi)輪(lun)和軸組(zu)成，通過不同的(de)齒(chi)輪(lun)組(zu)合產生變(bian)(bian)速(su)變(bian)(bian)矩；而自動(dong)變(bian)(bian)速(su)箱(xiang)AT是(shi)(shi)由液(ye)(ye)力(li)變(bian)(bian)扭器、行星齒(chi)輪(lun)、液(ye)(ye)壓變(bian)(bian)距系(xi)統(tong)和液(ye)(ye)壓操縱系(xi)統(tong)組(zu)成。通過液(ye)(ye)力(li)傳遞和齒(chi)輪(lun)組(zu)合的(de)方式(shi)來達到變(bian)(bian)速(su)變(bian)(bian)矩。