齒(chi)面(mian)(mian)(mian)的承載(zai)能力應該與齒(chi)面(mian)(mian)(mian)的硬(ying)(ying)(ying)度(du)(du)(du)有關。硬(ying)(ying)(ying)度(du)(du)(du)越高，承載(zai)能力越高。根據(ju)齒(chi)面(mian)(mian)(mian)的硬(ying)(ying)(ying)度(du)(du)(du)，人們通常(chang)將齒(chi)輪傳動分為兩種類(lei)型(xing)，即硬(ying)(ying)(ying)齒(chi)面(mian)(mian)(mian)齒(chi)輪傳動和軟齒(chi)面(mian)(mian)(mian)齒(chi)輪傳動。通常(chang)，一對嚙合齒(chi)輪的齒(chi)面(mian)(mian)(mian)硬(ying)(ying)(ying)度(du)(du)(du)大(da)于350HBW，稱為硬(ying)(ying)(ying)齒(chi)面(mian)(mian)(mian)齒(chi)輪，否則稱為軟齒(chi)面(mian)(mian)(mian)齒(chi)輪。