齒(chi)(chi)(chi)(chi)輪(lun)(lun)是(shi)依(yi)靠齒(chi)(chi)(chi)(chi)的嚙(nie)合(he)傳(chuan)遞扭(niu)矩(ju)的輪(lun)(lun)狀(zhuang)機械零(ling)(ling)件。齒(chi)(chi)(chi)(chi)輪(lun)(lun)通過與其它齒(chi)(chi)(chi)(chi)狀(zhuang)機械零(ling)(ling)件（如另(ling)一齒(chi)(chi)(chi)(chi)輪(lun)(lun)、齒(chi)(chi)(chi)(chi)條、蝸桿）傳(chuan)動(dong)(dong)(dong)，可(ke)實(shi)現(xian)改變(bian)轉(zhuan)速與扭(niu)矩(ju)、改變(bian)運動(dong)(dong)(dong)方向(xiang)和改變(bian)運動(dong)(dong)(dong)形(xing)式(shi)等(deng)功(gong)能。由于傳(chuan)動(dong)(dong)(dong)效(xiao)率高(gao)、傳(chuan)動(dong)(dong)(dong)比準確、功(gong)率范圍大等(deng)優點(dian)，齒(chi)(chi)(chi)(chi)輪(lun)(lun)機構在工業產品中廣泛應用，其設計與制造水(shui)平直接影(ying)響到工業產品的質(zhi)量。齒(chi)(chi)(chi)(chi)輪(lun)(lun)輪(lun)(lun)齒(chi)(chi)(chi)(chi)相互扣住齒(chi)(chi)(chi)(chi)輪(lun)(lun)會帶(dai)動(dong)(dong)(dong)另(ling)一個齒(chi)(chi)(chi)(chi)輪(lun)(lun)轉(zhuan)動(dong)(dong)(dong)來傳(chuan)送動(dong)(dong)(dong)力(li)(li)。 將兩個齒(chi)(chi)(chi)(chi)輪(lun)(lun)分(fen)開，也可(ke)以(yi)應用鏈條、履帶(dai)、皮(pi)帶(dai)來帶(dai)動(dong)(dong)(dong)兩邊的齒(chi)(chi)(chi)(chi)輪(lun)(lun)而傳(chuan)送動(dong)(dong)(dong)力(li)(li)。