齒(chi)(chi)面(mian)的(de)(de)承(cheng)載能(neng)力應該(gai)與(yu)齒(chi)(chi)面(mian)的(de)(de)硬(ying)度有關。硬(ying)度越高，承(cheng)載能(neng)力越高。根據齒(chi)(chi)面(mian)的(de)(de)硬(ying)度，人們通常將齒(chi)(chi)輪(lun)(lun)傳動(dong)分為(wei)兩種(zhong)類(lei)型，即硬(ying)齒(chi)(chi)面(mian)齒(chi)(chi)輪(lun)(lun)傳動(dong)和(he)軟齒(chi)(chi)面(mian)齒(chi)(chi)輪(lun)(lun)傳動(dong)。通常，一對嚙(nie)合齒(chi)(chi)輪(lun)(lun)的(de)(de)齒(chi)(chi)面(mian)硬(ying)度大(da)于350HBW，稱為(wei)硬(ying)齒(chi)(chi)面(mian)齒(chi)(chi)輪(lun)(lun)，否(fou)則(ze)稱為(wei)軟齒(chi)(chi)面(mian)齒(chi)(chi)輪(lun)(lun)。