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機械(xie)齒(chi)(chi)(chi)(chi)(chi)式聯軸(zhou)器是由齒(chi)(chi)(chi)(chi)(chi)數相同的內齒(chi)(chi)(chi)(chi)(chi)圈和帶外齒(chi)(chi)(chi)(chi)(chi)的凸緣半聯軸(zhou)器等零(ling)件(jian)組(zu)成(cheng)。外齒(chi)(chi)(chi)(chi)(chi)分為直齒(chi)(chi)(chi)(chi)(chi)和鼓形(xing)齒(chi)(chi)(chi)(chi)(chi)兩種(zhong)齒(chi)(chi)(chi)(chi)(chi)形(xing)，所(suo)謂鼓形(xing)齒(chi)(chi)(chi)(chi)(chi)即為將外齒(chi)(chi)(chi)(chi)(chi)制成(cheng)球(qiu)面，球(qiu)面中心在齒(chi)(chi)(chi)(chi)(chi)輪軸(zhou)線上，齒(chi)(chi)(chi)(chi)(chi)側間隙較一般(ban)齒(chi)(chi)(chi)(chi)(chi)輪大(da)，鼓形(xing)齒(chi)(chi)(chi)(chi)(chi)聯軸(zhou)器可(ke)允許較大(da)的角位(wei)移(相對于直齒(chi)(chi)(chi)(chi)(chi)聯軸(zhou)器)，可(ke)改善齒(chi)(chi)(chi)(chi)(chi)的接觸條(tiao)件(jian)，提高傳遞轉矩的能力，延長使用壽命。

機(ji)械齒式聯(lian)(lian)軸(zhou)器在工(gong)作時，兩軸(zhou)產(chan)生相對(dui)位(wei)移，內外齒的(de)齒面周期性作軸(zhou)向相對(dui)滑(hua)動(dong)，必然形(xing)成(cheng)齒面磨(mo)損(sun)和功(gong)率損(sun)耗，因此齒式聯(lian)(lian)軸(zhou)器需在良好潤滑(hua)和密封的(de)狀態下工(gong)作。

機械齒(chi)(chi)(chi)(chi)式聯軸(zhou)(zhou)器徑向尺(chi)寸小，承載能力大(da)，常用(yong)(yong)于(yu)低速(su)重(zhong)載工況條件的(de)軸(zhou)(zhou)系傳(chuan)動(dong)，如冶金(jin)、礦山、起重(zhong)運輸行業(ye)，也適用(yong)(yong)于(yu)石油、化工、通用(yong)(yong)機械等行業(ye)。高精度并經動(dong)平衡的(de)齒(chi)(chi)(chi)(chi)式聯軸(zhou)(zhou)器可(ke)用(yong)(yong)于(yu)高速(su)傳(chuan)動(dong)，如燃汽(qi)輪機的(de)軸(zhou)(zhou)系傳(chuan)動(dong)。由于(yu)鼓(gu)形齒(chi)(chi)(chi)(chi)式聯軸(zhou)(zhou)器的(de)角向補償大(da)于(yu)直齒(chi)(chi)(chi)(chi)式聯軸(zhou)(zhou)器，國內(nei)外均廣(guang)泛采用(yong)(yong)鼓(gu)形齒(chi)(chi)(chi)(chi)式聯軸(zhou)(zhou)器。