A4VG90HWD2/32R-PZF02F001S Rexroth軸向柱塞泵是上海韋米機(jī)電設(shè)備有限公司主要經(jīng)銷(xiāo)產(chǎn)品之一，保證產(chǎn)品【原裝*】，*，貨期短，發(fā)貨快；常規(guī)產(chǎn)品現(xiàn)貨供應(yīng)，放心購(gòu)買(mǎi)。我公司專(zhuān)業(yè)經(jīng)營(yíng)國(guó)外進(jìn)口液壓氣動(dòng)備件、自動(dòng)化儀表；主營(yíng)產(chǎn)品：液壓配件、氣動(dòng)元件、柱塞泵、齒輪泵、葉片泵、電磁閥、節(jié)流閥、比例閥、溢流閥、換向閥、流量閥；伺服驅(qū)動(dòng)器、伺服模塊、伺服電機(jī)、探頭、傳感器、電纜、電源模塊、編碼器、接近開(kāi)關(guān)等。常規(guī)型號(hào)產(chǎn)品現(xiàn)貨供應(yīng)，熱誠(chéng)歡迎新老客戶采購(gòu)！
液壓泵是液壓系統(tǒng)的動(dòng)力元件，其功用是給液壓系統(tǒng)提供壓力油，從能量轉(zhuǎn)換角度講，它將是原動(dòng)機(jī)（如發(fā)動(dòng)機(jī)）輸出的機(jī)械能轉(zhuǎn)換為便于輸送的液體的壓力能。液壓馬達(dá)則屬于執(zhí)行元件，它能將輸入液體的壓力能轉(zhuǎn)換為輸出軸轉(zhuǎn)動(dòng)的機(jī)械能，用來(lái)拖動(dòng)負(fù)載做功。根據(jù)結(jié)構(gòu)形式，液壓泵與液壓馬達(dá)具體可分為齒輪式、葉片式、柱塞式等類(lèi)型。
1.液壓泵壓力
液壓泵工作壓力是指泵（或馬達(dá)）在實(shí)際工作時(shí)輸出（或輸入）油液的壓力，由外負(fù)載決定。
額定壓力是指在正常工作條件下，按試驗(yàn)標(biāo)準(zhǔn)規(guī)定能連續(xù)運(yùn)轉(zhuǎn)的zui高壓力。其大小受壽命的限制，若超過(guò)額定壓力工作，泵（或馬達(dá)）的使用壽命將會(huì)比設(shè)計(jì)的壽命短。當(dāng)工作壓力大于額定壓力時(shí)稱超載。
2.轉(zhuǎn)速
工作轉(zhuǎn)速是指泵（或馬達(dá)）在工作時(shí)的實(shí)際轉(zhuǎn)動(dòng)速度。
額定轉(zhuǎn)速是指在額定壓力下，能連續(xù)長(zhǎng)時(shí)間正常運(yùn)轉(zhuǎn)的zui高轉(zhuǎn)速。若泵超過(guò)額定轉(zhuǎn)速工作將會(huì)造成吸油不足，產(chǎn)生振動(dòng)和大的噪聲，零件會(huì)遭受氣蝕損傷，壽命降低。
zui低穩(wěn)定轉(zhuǎn)速是指馬達(dá)正常運(yùn)轉(zhuǎn)所允許的zui低轉(zhuǎn)速。在此轉(zhuǎn)速下，馬達(dá)不出現(xiàn)爬行現(xiàn)象。
3.排量、流量
排量是指泵（或馬達(dá)）每轉(zhuǎn)一周，由密封容腔幾何尺寸變化而得的排出（或輸入）液體的體積，常用單位是ml/r（毫升/轉(zhuǎn)）。排量可以通過(guò)調(diào)節(jié)發(fā)生變化的成為變量泵（或變量馬達(dá)），排量不能變化的成為定量泵（或定量馬達(dá)）。
實(shí)際流量是指泵（或馬達(dá)）工作時(shí)出口處（或進(jìn)口處）的流量。由于泵本身存在內(nèi)泄漏，其實(shí)際流量小于理論流量。由于馬達(dá)本身也存在內(nèi)泄漏，要實(shí)現(xiàn)轉(zhuǎn)速，為補(bǔ)償泄漏量，其輸入實(shí)際流量必須大于理論流量。
4.效率
容積效率，對(duì)液壓泵是指其實(shí)際流量與理論流量的比值。對(duì)液壓馬達(dá)是指其理論流量與實(shí)際流量的比值。
機(jī)械效率，對(duì)液壓泵是指其理論轉(zhuǎn)矩與實(shí)際輸入轉(zhuǎn)矩的比值。對(duì)液壓馬達(dá)其實(shí)際輸出的轉(zhuǎn)矩為理論轉(zhuǎn)矩克服摩擦力后的轉(zhuǎn)矩，因此其機(jī)械效率為實(shí)際輸出轉(zhuǎn)矩與理論轉(zhuǎn)矩的比值。
總效率是指泵（或馬達(dá)）的輸出功率與輸入功率的比值。總效率等于容積效率與機(jī)械效率的乘積。
上海韋米機(jī)電設(shè)備有限公司位于浦東金橋是全國(guó)工業(yè)傳動(dòng)流體自動(dòng)化領(lǐng)域?qū)嵙^強(qiáng)的經(jīng)銷(xiāo)商，有著豐富的氣動(dòng)液壓技術(shù)服務(wù)、工業(yè)銷(xiāo)售及采購(gòu)的經(jīng)驗(yàn)，主營(yíng)產(chǎn)品涉及液壓泵閥（電磁閥、柱塞泵拳頭產(chǎn)品）、工控產(chǎn)品、驅(qū)動(dòng)模塊、伺服電機(jī)、可編程控制器PLC、數(shù)控傳動(dòng)、傳感器系列、電源、氣動(dòng)元件、工業(yè)儀器儀表。具體主要經(jīng)營(yíng)品牌及產(chǎn)品如下:
博世力士樂(lè)rexroth工業(yè)液壓氣動(dòng)元件大量現(xiàn)貨（電磁換向閥、節(jié)流閥、單向閥、比例閥、伺服閥、安全溢流閥、流量控制閥、減壓閥、調(diào)節(jié)閥、壓力繼電器、比例放大板、放大器，軸向柱塞泵、葉片泵、齒輪泵，伺服驅(qū)動(dòng)器、伺服電機(jī)，氣動(dòng)元件、氣動(dòng)閥、氣缸等），部分系列型號(hào)：
電磁閥：4WE6、4WE10、4WE16；電液閥：4WEH10H、4WEH16、4WEH25，
單向閥：S10A、S20A、Z1S、Z2S、SL10、SL20、SV10、SV20、RVP，插裝閥：LC、LFA
溢流閥：DB、DBW、DBET、DBD、ZDB、Z2DB，減壓閥：DR6DP、DR10DP、ZDR6、ZDR10、DR-4X、DR-5X
節(jié)流閥：Z2FS6、Z2FS10、Z2FS16、Z2FS22；調(diào)速閥：2FRM5、2FRM10、2FRM16，
平衡閥：FD12FA、FD12PA、FD12KA、FD16FA，繼電器：HED80、HED40，電子單元：VT、0811
比例方向閥：4WRA、4WRAE、4WRE、4WREE、4WREEM、4WRH、4WRZ、4WRZE、4WRKE、4WRBKE、4WS2EM
高頻響方向閥：4WRPH、4WRPEH、5WRP、5WRPE、4WRREH、4WRP、4WRPE、4WRP(E)H、4WRSE、4WRSEH、4WRPNH、4WRL、4WRLE、4WRVE、4WRGE、4WRL、4WRLE、4WRDE、3WRCBH，伺服系統(tǒng)：HAS、HNL、HCS、HNL
柱塞泵：A4VSO、A10VSO、A2FO，定量馬達(dá)：A2FM，A4FM，A10FM/E， 齒輪泵：0510、AZPF，葉片泵：PV7
意大利阿托斯ATOS及迪普馬DUPLOMATIC、美國(guó)Parker派克及EATON VICKERS伊頓 威格士液壓、日本YUKEN油研泵閥優(yōu)勢(shì)現(xiàn)貨系列（電磁閥換向閥、壓力開(kāi)關(guān)、柱塞泵、齒輪泵、比例閥、截止閥、開(kāi)關(guān)閥等），
奧地利貝加萊B&R br-automation自動(dòng)化配品配件貨期短現(xiàn)貨多（伺服驅(qū)動(dòng)器、觸摸屏、工控機(jī)、CPU模塊、總線控制器、X20\2003\2005\2010系統(tǒng)中各類(lèi)功能模塊等），
美國(guó)本特利(Bently Nevada)優(yōu)勢(shì)系列（監(jiān)測(cè)模塊、前置器、儀表框架、接口模塊、延伸電纜、傳感器探頭、轉(zhuǎn)速表、校驗(yàn)儀等）
西門(mén)子Siemens優(yōu)勢(shì)主打系列（6SN、6FC、6FX、S7200、電機(jī)1FK、S7300、S7400、LOGO 低壓電器、軟啟、熔斷器、電源模塊、CPU、數(shù)控傳動(dòng)）
另銷(xiāo)售有德國(guó)愛(ài)爾泰克Airtec氣動(dòng)元件，APS接近開(kāi)關(guān)，SMC氣動(dòng)元件，倍加福編碼器、傳感器，歐姆龍低壓電器、川崎K3V泵 ，賀德克液壓元件、丹佛斯、費(fèi)斯托全系列產(chǎn)品.
A4VG90HWD2/32R-PZF02F001S Rexroth軸向柱塞泵
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柱塞泵一般分為單柱塞泵、臥式柱塞泵、軸向柱塞泵和徑向柱塞泵。
單柱塞泵
結(jié)構(gòu)組成主要有偏心輪、柱塞、彈簧、缸體、兩個(gè)單向閥。柱塞與缸體孔之間形成密閉容積。偏心輪旋轉(zhuǎn)一轉(zhuǎn)，柱塞上下往復(fù)運(yùn)動(dòng)一次，向下運(yùn)動(dòng)吸油，向上運(yùn)動(dòng)排油。泵每轉(zhuǎn)一轉(zhuǎn)排出的油液體積稱為排量，排量只與泵的結(jié)構(gòu)參數(shù)有關(guān)。
臥式柱塞泵
臥式柱塞泵是由幾個(gè)柱塞（一般為3個(gè)或6個(gè)）并列安裝，用1根曲軸通過(guò)連桿滑塊或由偏心軸直接推動(dòng)柱塞做往復(fù)運(yùn)動(dòng)，實(shí)現(xiàn)吸、排液體的液壓泵。它們也都采用閥式配流裝置，而且大多為定量泵。煤礦液壓支架系統(tǒng)中的乳化液泵一般都是臥式柱塞泵。
乳化液泵用于采煤工作面，為液壓支架提供乳化液，工作原理靠曲軸的旋轉(zhuǎn)帶動(dòng)活塞做往復(fù)運(yùn)動(dòng)，實(shí)現(xiàn)吸液和排液。
軸向柱塞泵（英文名：Piston pump）是活塞或柱塞的往復(fù)運(yùn)動(dòng)方向與缸體中心軸平行的柱塞泵。軸向柱塞泵利用與傳動(dòng)軸平行的柱塞在柱塞孔內(nèi)往復(fù)運(yùn)動(dòng)所產(chǎn)生的容積變化來(lái)進(jìn)行工作的。由于柱塞和柱塞孔都是圓形零件，加工時(shí)可以達(dá)到很高的精度配合，因此容積效率高
直軸斜盤(pán)式柱塞泵分為壓力供油型和自吸油型兩種。壓力供油型液壓泵大都是采用有氣壓的油箱，靠氣壓供油的液壓油箱，在每次啟動(dòng)機(jī)器之后，必須等液壓漬箱達(dá)到使用氣壓后，才能操作機(jī)械。如液壓油箱的氣壓不足時(shí)就啟動(dòng)機(jī)器，會(huì)對(duì)液壓泵內(nèi)的與滑靴造成拉脫現(xiàn)象，出會(huì)造成泵體內(nèi)回程板與壓板的非正常磨損。
徑向柱塞泵可分為閥配流與軸配流兩大類(lèi)。閥配流徑向柱塞泵存在故障率高、效率低等缺點(diǎn)。上70、80年代發(fā)展的軸配流徑向柱塞泵克服了閥配流徑向柱塞泵的不足。由于徑向泵結(jié)構(gòu)上的特點(diǎn)，固定了軸配流徑向柱塞泵比軸向柱塞泵耐沖擊、壽命長(zhǎng)、控制精度高。變量行程短泵的變量是在變量柱塞和限位柱塞作用下，改變定子的偏心距實(shí)現(xiàn)的，而定于的zui大偏心距為 5—9mm（根據(jù)排量大小不同），變量行程很短。且變量機(jī)構(gòu)設(shè)計(jì)為高壓操縱，由控制閥進(jìn)行控制。故該泵的響應(yīng)速度快。徑向結(jié)構(gòu)設(shè)計(jì)克服了如軸向柱塞泵滑靴偏磨的問(wèn)題。使其抗沖擊能力大幅度提高。
Rexroth軸向柱塞泵
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Rexroth軸向柱塞泵
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(kāi)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(guò)程可分為以下兩個(gè)階段。
進(jìn)油過(guò)程
當(dāng)凸輪的凸起部分轉(zhuǎn)過(guò)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(kāi)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(guò)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(guò)去后，在彈簧的作用下，柱塞又下行。此時(shí)便開(kāi)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(kāi)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(kāi)，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。
