齒(chi)(chi)輪(lun)(lun)是依靠齒(chi)(chi)的(de)嚙合傳遞(di)扭矩的(de)輪(lun)(lun)狀機械零件(jian)。齒(chi)(chi)輪(lun)(lun)通過與(yu)其(qi)它齒(chi)(chi)狀機械零件(jian)（如另一齒(chi)(chi)輪(lun)(lun)、齒(chi)(chi)條(tiao)(tiao)、蝸(gua)桿）傳動(dong)(dong)，可實現改(gai)變轉速與(yu)扭矩、改(gai)變運動(dong)(dong)方向(xiang)和(he)改(gai)變運動(dong)(dong)形式等功能(neng)。由(you)于傳動(dong)(dong)效率高、傳動(dong)(dong)比準確、功率范圍大(da)等優點，齒(chi)(chi)輪(lun)(lun)機構在工(gong)業產品(pin)中廣泛應用(yong)，其(qi)設計與(yu)制造水平直接影(ying)響到工(gong)業產品(pin)的(de)質(zhi)量。齒(chi)(chi)輪(lun)(lun)輪(lun)(lun)齒(chi)(chi)相互扣住齒(chi)(chi)輪(lun)(lun)會帶(dai)動(dong)(dong)另一個齒(chi)(chi)輪(lun)(lun)轉動(dong)(dong)來傳送(song)動(dong)(dong)力。 將兩個齒(chi)(chi)輪(lun)(lun)分開，也可以應用(yong)鏈條(tiao)(tiao)、履帶(dai)、皮帶(dai)來帶(dai)動(dong)(dong)兩邊(bian)的(de)齒(chi)(chi)輪(lun)(lun)而傳送(song)動(dong)(dong)力。