REXROTH柱塞泵的機(jī)械原理

柱塞泵柱塞往復(fù)運(yùn)動(dòng)總行程L是不變的，由凸輪的升程決定。柱塞每循環(huán)的供油量大小取決于供油行程,供油行程不受凸輪軸控制是可變的。供油開始時(shí)刻不隨供油行程的變化而變化。轉(zhuǎn)動(dòng)柱塞可改變供油終了時(shí)刻，從而改變供油量。柱塞泵工作時(shí)，在噴油泵凸輪軸上的凸輪與柱塞彈簧的作用下，迫使柱塞作上、下往復(fù)運(yùn)動(dòng)，從而完成泵油任務(wù)，泵油過程可分為以下兩個(gè)階段。

進(jìn)油過程

當(dāng)凸輪的凸起部分轉(zhuǎn)過去后，在彈簧力的作用下，柱塞向下運(yùn)動(dòng)，柱塞上部空間（稱為泵油室）產(chǎn)生真空度，當(dāng)柱塞上端面把柱塞套上的進(jìn)油孔打開后，充滿在油泵上體油道內(nèi)的柴油經(jīng)油孔進(jìn)入泵油室，柱塞運(yùn)動(dòng)到下止點(diǎn)，進(jìn)油結(jié)束

回油過程

柱塞向上供油，當(dāng)上行到柱塞上的斜槽（停供邊）與套筒上的回油孔相通時(shí)，泵油室低壓油路便與柱塞頭部的中孔和徑向孔及斜槽溝通，油壓驟然下降，出油閥在彈簧力的作用下迅速關(guān)閉，停止供油。此后柱塞還要上行，當(dāng)凸輪的凸起部分轉(zhuǎn)過去后，在彈簧的作用下，柱塞又下行。此時(shí)便開始了下一個(gè)循環(huán)。

柱塞泵以一個(gè)柱塞為原理介紹，一個(gè)柱塞泵上有兩個(gè)單向閥，并且方向相反，柱塞向一個(gè)方向運(yùn)動(dòng)時(shí)缸內(nèi)出現(xiàn)負(fù)壓，這時(shí)一個(gè)單向閥打開液體被吸入缸內(nèi)，柱塞向另一個(gè)方向運(yùn)動(dòng)時(shí)，將液體壓縮后另一個(gè)單向閥被打開，被吸入缸內(nèi)的液體被排出。這種工作方式連續(xù)運(yùn)動(dòng)后就形成了連續(xù)供油 。

REXROTH柱塞泵;部分型號如下

A4VTG90HW/32R
A4VG125HD1D2/32R-NSF001S
A4VSO180DR/3XR-PPB13N00
A4VSO125DR/3DR-PPB13NOO
A4VS0125LR2N/22L-PZB13A00
A4VTG90HW/3IR-NLD10F001S
A4VG56EZ1DMV32R-PSC02F023E-S
A4VG90EP2DT1/32R-NAF02F001F
A4VG90EP2DT1/32L-NAFO2F001D
E-A4VS0250DR/30RPPB13N00
A4VS0125DR/22R-PPB13N00
A4VS0180DR/30R-PPB13N00
A4VG125HDDT132L-PZF02F001D
EA4VS0125DFR/30R-PPB13N00
A4VS040DR-PPB13N00
A4VS0180DR/22R-PPB13N00
A4VSO40EO/31L-P2BBN00
A4VSO180EO/30L-P2B13N00
A4VS040DR/10X-PPB13N00
AE-A4VS0250E01/30R-PPBN00-S036
A4V125HW10R0C101A-K
AHA4VS0250HD1GB/30R-PZB13K35-S
AHA4VS0250LR3G/30R-PZB13K35-S0
AHA4VS0250LR3G/30R-PZB13N00-S0
A4VG180HDMT1/32R-NSD02F021SG-S
A4VG180EP2DT1/32R-NTD02F021SH
AHA4VS0250HD1GB/30R-PZB13K35-S
AHA4VS0250LR3G/30R-PZB13K35-S0
AHA4VS0250LR3G/30R-PZB13N00-S0
A4VG250HD1D1/32LNZD10F001S
A4VG125HDDT1/32L-PZF02F001D
A4V125HW10R0C101A-K
A4VG125EP2D1/32R-NAF02K691EP-4
A4VG125DA2D2/32R-NAF02F021DT
A4VG56EZ2DM1/32L-NSC02F013SH-K
A4VG56EZ2DM1/32R-NSC02F013SH
A4VTG90HW/32R-NLD10F001S
A4VTG71HW/32R-NLD10F001S
A4VTG90HW32R-NLD10FOO1S
A4VG90HWDL1/32R-NAF02F071L-S+A
A4VG90HWDL1/32L-NZF02F001S-S B
A4VG125EP2D1/32R-NAF02K691EP-4
A4VG125DA2D2/32R-NAF02F021DT
A4VG56EZ2DM1/32L-NSC02F013SH-K
A4VG125HD1DT1/32R-NSF02F001S
A4VS0500HSK/30L-PPH13N0010SET
E-A4VS040DR/10R-PPB13NOO
A4VS0125DR30R-PPB13N00
A4VG250HD1D1/32LNZD10F001S
A4VG71EP/32R-NAF02F011S
A4VG125HDM1/32R-NSF02F691S-S
A4VG250HD1D1/32LNZD10F001S
A4VG125HDM1/32R-NSF02F691S-S
A4VS0250DRG/30R-PPB13N00
E-A4VS0180DR/30R-PPB13N00
A4VG125HD1DT1/32R-NSF02F001S
A4VS0500HSK/30L-PPH13N0010SET
A4VS0125DR30R-PPB13N00
A4VG90HWD2/32R-PZF02F001S
A4VG125HDDT1/32L-PZF02F001D
A4VG71EPDT1/32R-NAF02F011S
A4VG90EP2DT1/32R-NAF02F011S
A4VG125EP2DT1/32R-NAF02F011S
A4VG125HD1P1/32R-N2D10F69
A4VG71EZ2DM1/32L-NZF02F021S-SK
A4VG125HDMTI/32R-PSF02P691S

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