底(di)盤：底(di)盤作用是支(zhi)承、安裝汽(qi)車(che)(che)發動(dong)(dong)(dong)機(ji)及(ji)其各部件(jian)、總成，形(xing)成汽(qi)車(che)(che)的(de)整(zheng)體造型(xing)，并接受發動(dong)(dong)(dong)機(ji)的(de)動(dong)(dong)(dong)力，使汽(qi)車(che)(che)產生運動(dong)(dong)(dong)，保證 正常行駛(shi)。底(di)盤由傳(chuan)動(dong)(dong)(dong)系(xi)、行駛(shi)系(xi)、轉向系(xi)和制動(dong)(dong)(dong)系(xi)四部分組成。