力士樂(le)柱塞(sai)(sai)泵以一個(ge)(ge)(ge)柱塞(sai)(sai)為原理介紹，一個(ge)(ge)(ge)柱塞(sai)(sai)泵上有(you)兩個(ge)(ge)(ge)單(dan)向閥，并(bing)且方(fang)向相反，柱塞(sai)(sai)向一個(ge)(ge)(ge)方(fang)向運(yun)(yun)動時(shi)缸(gang)內(nei)出(chu)現負壓(ya)，這(zhe)時(shi)一個(ge)(ge)(ge)單(dan)向閥打開(kai)液(ye)體(ti)(ti)被吸(xi)入缸(gang)內(nei)，柱塞(sai)(sai)向另(ling)一個(ge)(ge)(ge)方(fang)向運(yun)(yun)動時(shi)，將液(ye)體(ti)(ti)壓(ya)縮后另(ling)一個(ge)(ge)(ge)單(dan)向閥被打開(kai)，被吸(xi)入缸(gang)內(nei)的液(ye)體(ti)(ti)被排(pai)出(chu)。這(zhe)種工作方(fang)式連(lian)續運(yun)(yun)動后就(jiu)形成了連(lian)續供油。

柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)泵柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)往(wang)復運(yun)動總行(xing)(xing)程(cheng)L是不(bu)變(bian)的，由(you)凸輪的升程(cheng)決定。柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)每循環的供(gong)油(you)(you)(you)量大小取決于供(gong)油(you)(you)(you)行(xing)(xing)程(cheng)，供(gong)油(you)(you)(you)行(xing)(xing)程(cheng)不(bu)受凸輪軸(zhou)控制是可變(bian)的。供(gong)油(you)(you)(you)開始時(shi)刻不(bu)隨(sui)供(gong)油(you)(you)(you)行(xing)(xing)程(cheng)的變(bian)化而(er)變(bian)化。轉動柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)可改(gai)變(bian)供(gong)油(you)(you)(you)終了(le)時(shi)刻，從(cong)(cong)而(er)改(gai)變(bian)供(gong)油(you)(you)(you)量。柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)泵工作(zuo)時(shi)，在噴油(you)(you)(you)泵凸輪軸(zhou)上的凸輪與柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)彈簧的作(zuo)用下(xia)，迫使(shi)柱(zhu)(zhu)(zhu)塞(sai)(sai)(sai)作(zuo)上、下(xia)往(wang)復運(yun)動，從(cong)(cong)而(er)完(wan)成(cheng)泵油(you)(you)(you)任務，泵油(you)(you)(you)過(guo)程(cheng)可分為以(yi)下(xia)兩(liang)個(ge)階(jie)段。
    進油(you)(you)(you)(you)過(guo)程：當凸輪的(de)(de)凸起部(bu)分轉過(guo)去后，在(zai)彈簧力的(de)(de)作用下，柱(zhu)(zhu)塞(sai)向下運動，柱(zhu)(zhu)塞(sai)上部(bu)空間（稱(cheng)為泵油(you)(you)(you)(you)室）產生真空度，當柱(zhu)(zhu)塞(sai)上端面(mian)把柱(zhu)(zhu)塞(sai)套上的(de)(de)進油(you)(you)(you)(you)孔打開(kai)后，充滿在(zai)油(you)(you)(you)(you)泵上體油(you)(you)(you)(you)道內的(de)(de)柴油(you)(you)(you)(you)經油(you)(you)(you)(you)孔進入泵油(you)(you)(you)(you)室，柱(zhu)(zhu)塞(sai)運動到下止點，進油(you)(you)(you)(you)結束(shu)
    回(hui)油(you)過程：柱(zhu)(zhu)塞(sai)向上供油(you)，當(dang)上行到柱(zhu)(zhu)塞(sai)上的(de)斜槽（停供邊）與套筒上的(de)回(hui)油(you)孔(kong)相通(tong)時，泵油(you)室低壓油(you)路(lu)便與柱(zhu)(zhu)塞(sai)頭部(bu)的(de)中(zhong)孔(kong)和徑向孔(kong)及(ji)斜槽溝通(tong)，油(you)壓驟然下(xia)降(jiang)，出油(you)閥在彈簧力的(de)作(zuo)用(yong)下(xia)迅速關閉，停止供油(you)。此后(hou)(hou)柱(zhu)(zhu)塞(sai)還要上行，當(dang)凸輪的(de)凸起部(bu)分轉(zhuan)過去(qu)后(hou)(hou)，在彈簧的(de)作(zuo)用(yong)下(xia)，柱(zhu)(zhu)塞(sai)又(you)下(xia)行。此時便開始(shi)了下(xia)一個循環。

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