齒(chi)(chi)面(mian)(mian)(mian)的(de)承(cheng)載能力(li)應該與齒(chi)(chi)面(mian)(mian)(mian)的(de)硬度有關。硬度越高(gao)，承(cheng)載能力(li)越高(gao)。根據齒(chi)(chi)面(mian)(mian)(mian)的(de)硬度，人們通常將齒(chi)(chi)輪傳(chuan)動分為(wei)(wei)兩種類型，即硬齒(chi)(chi)面(mian)(mian)(mian)齒(chi)(chi)輪傳(chuan)動和(he)軟齒(chi)(chi)面(mian)(mian)(mian)齒(chi)(chi)輪傳(chuan)動。通常，一對嚙合齒(chi)(chi)輪的(de)齒(chi)(chi)面(mian)(mian)(mian)硬度大(da)于(yu)350HBW，稱為(wei)(wei)硬齒(chi)(chi)面(mian)(mian)(mian)齒(chi)(chi)輪，否(fou)則稱為(wei)(wei)軟齒(chi)(chi)面(mian)(mian)(mian)齒(chi)(chi)輪。