減(jian)(jian)(jian)速(su)機(ji)在原動機(ji)和(he)工作機(ji)或執行機(ji)構之間(jian)起匹配轉(zhuan)速(su)和(he)傳(chuan)遞轉(zhuan)矩的(de)作用(yong)，是一種(zhong)相對精-密的(de)機(ji)械。使用(yong)它(ta)的(de)目的(de)是降低(di)轉(zhuan)速(su)，增(zeng)加轉(zhuan)矩。它(ta)的(de)種(zhong)類(lei)繁多，型(xing)號各(ge)異，不同(tong)種(zhong)類(lei)有(you)不同(tong)的(de)用(yong)途。減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)的(de)種(zhong)類(lei)繁多，按(an)照傳(chuan)動類(lei)型(xing)可分為齒(chi)(chi)輪(lun)(lun)減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)、蝸(gua)桿減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)和(he)行星(xing)齒(chi)(chi)輪(lun)(lun)減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)；按(an)照傳(chuan)動級數(shu)不同(tong)可分為單級和(he)多級減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)；按(an)照齒(chi)(chi)輪(lun)(lun)形狀可分為圓(yuan)柱(zhu)(zhu)齒(chi)(chi)輪(lun)(lun)減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)、圓(yuan)錐(zhui)齒(chi)(chi)輪(lun)(lun)減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)和(he)圓(yuan)錐(zhui)－圓(yuan)柱(zhu)(zhu)齒(chi)(chi)輪(lun)(lun)減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)；按(an)照傳(chuan)動的(de)布置形式(shi)(shi)又可分為展開式(shi)(shi)、分流式(shi)(shi)和(he)同(tong)軸(zhou)式(shi)(shi)減(jian)(jian)(jian)速(su)器(qi)(qi)(qi)(qi)。

　　作用

　　1、降速(su)(su)同時(shi)提(ti)高輸出扭矩，扭矩輸出比(bi)例按(an)電機輸出乘(cheng)減(jian)速(su)(su)比(bi)，但要注意不能超出減(jian)速(su)(su)機額定(ding)扭矩；2、減(jian)速(su)(su)同時(shi)降低了(le)負載的(de)慣量(liang)，慣量(liang)的(de)減(jian)少為(wei)減(jian)速(su)(su)比(bi)的(de)平(ping)方(fang)。