偏心(xin)(xin)輪電動(dong)(dong)推桿(gan)行(xing)星(xing)傳(chuan)動(dong)(dong)屬于活齒(chi)(chi)傳(chuan)動(dong)(dong)范疇，類似于少齒(chi)(chi)差行(xing)星(xing)齒(chi)(chi)輪傳(chuan)動(dong)(dong)和擺(bai)線 針(zhen)輪行(xing)星(xing)傳(chuan)動(dong)(dong)。上(shang)已述及，如(ru)果偏心(xin)(xin)輪、內(nei)齒(chi)(chi)圈、傳(chuan)動(dong)(dong)圈三(san)者分別承擔固定、輸(shu) 入和輸(shu)出三(san)種角(jiao)色，將獲得迥然不同(tong)的(de)傳(chuan)動(dong)(dong)比和變速傳(chuan)動(dong)(dong)效(xiao)果。

若偏心輪(lun)(lun)輸(shu)入(ru)、傳(chuan)(chuan)動(dong)圈(quan)(quan)(quan)固定(ding)(ding)，當驅(qu)動(dong)力矩(ju)由輸(shu)入(ru)軸輸(shu)入(ru)后，其以等角速(su)度帶 動(dong)偏心輪(lun)(lun)轉(zhuan)動(dong)。由于(yu)偏心距的(de)存在，偏心輪(lun)(lun)推動(dong)活(huo)齒（由內(nei)滾柱、電(dian)動(dong)推桿及外滾 柱組成）在傳(chuan)(chuan)動(dong)圈(quan)(quan)(quan)的(de)徑向(xiang)槽內(nei)做往復(fu)運動(dong)，又由于(yu)傳(chuan)(chuan)動(dong)圈(quan)(quan)(quan)對(dui)電(dian)動(dong)推桿的(de)約(yue)束，迫使(shi) 活(huo)齒推動(dong)內(nei)齒圈(quan)(quan)(quan)轉(zhuan)動(dong)，從(cong)(cong)而實現了從(cong)(cong)偏心輪(lun)(lun)向(xiang)內(nei)齒圈(quan)(quan)(quan)定(ding)(ding)速(su)比的(de)速(su)度轉(zhuan)換和功(gong)率傳(chuan)(chuan) 遞。此時，偏心輪(lun)(lun)輸(shu)人，內(nei)齒圈(quan)(quan)(quan)輸(shu)出(chu)，輸(shu)出(chu)結果為輸(shu)人輸(shu)出(chu)轉(zhuan)向(xiang)相反的(de)大速(su)比減(jian) 速(su)傳(chuan)(chuan)動(dong)。