齒(chi)(chi)面(mian)的(de)(de)承(cheng)載(zai)能力應該與(yu)齒(chi)(chi)面(mian)的(de)(de)硬度有(you)關(guan)。硬度越高，承(cheng)載(zai)能力越高。根據齒(chi)(chi)面(mian)的(de)(de)硬度，人們通(tong)常(chang)(chang)將齒(chi)(chi)輪傳動分為兩(liang)種類(lei)型，即硬齒(chi)(chi)面(mian)齒(chi)(chi)輪傳動和軟(ruan)齒(chi)(chi)面(mian)齒(chi)(chi)輪傳動。通(tong)常(chang)(chang)，一對嚙合齒(chi)(chi)輪的(de)(de)齒(chi)(chi)面(mian)硬度大于350HBW，稱(cheng)(cheng)為硬齒(chi)(chi)面(mian)齒(chi)(chi)輪，否則稱(cheng)(cheng)為軟(ruan)齒(chi)(chi)面(mian)齒(chi)(chi)輪。