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REXROTH齒輪泵

力士樂（Bosch Rexroth）為工業(yè)及工廠自動(dòng)化,、行走機(jī)械,、以及可再生能源等領(lǐng)域的客戶提供傳動(dòng)、控制與移動(dòng)解決方案；作為超過50萬客戶的共同選擇,，力士樂正不斷為客戶提供高質(zhì)量的電控,、液壓、氣動(dòng)以及機(jī)電一體化元件和系統(tǒng),。
bosch rexroth不僅是*強(qiáng)公司,，也是世界*高科技企業(yè)之一，50多年來,，Bosch Rexroth集團(tuán)及Bosch Rexroth公司的業(yè)務(wù)部門致力于開發(fā)專業(yè)型液壓傳動(dòng)領(lǐng)域高科技產(chǎn)品,，其產(chǎn)品和品牌已享譽(yù)。 力士樂的產(chǎn)品是*的,，因?yàn)樵诟鲊袌錾?，目前沒有其他的品牌能向顧客提供所有傳動(dòng)與控制技術(shù)，專門化與一體化并舉,。正因如此,，博世-力士樂在液壓傳動(dòng),、控制及移動(dòng)技術(shù)等領(lǐng)域成為了標(biāo)志性的榜樣,。

rexroth齒輪泵是依靠泵缸與嚙合齒輪間所形成的工作容積變化和移動(dòng)來輸送液體或使之增壓的回轉(zhuǎn)泵。rexroth齒輪泵由兩個(gè)齒輪,、泵體與前后蓋組成兩個(gè)封閉空間,，當(dāng)齒輪轉(zhuǎn)動(dòng)時(shí)，齒輪脫開側(cè)的空間的體積從小變大,，形成真空,，將液體吸入，rexroth齒輪泵齒輪嚙合側(cè)的空間的體積從大變小,，而將液體擠入管路中去,。吸入腔與排出腔是靠兩個(gè)齒輪的嚙合線來隔開的。齒輪泵的排出口的壓力*取決于泵出口處阻力的大小,。
rexroth齒輪泵
優(yōu)點(diǎn)：rexroth齒輪泵結(jié)構(gòu)簡單緊湊,、體積小、質(zhì)量輕,、工藝性好,、價(jià)格便宜、自吸力強(qiáng),、對油液污染不敏感,、轉(zhuǎn)速范圍大、能耐沖擊性負(fù)載,，維護(hù)方便,、工作可靠。
缺點(diǎn)：rexroth齒輪泵徑向力不平衡、流動(dòng)脈動(dòng)大,、噪聲大,、效率低，零件的互換性差,，磨損后不易修復(fù),，不能做變量泵用。
rexroth齒輪泵困油現(xiàn)象
原因：rexroth齒輪泵液壓油在漸開線齒輪泵運(yùn)轉(zhuǎn)過程中,，因齒輪相交處的封閉體積隨時(shí)間改變,，常有一部分的液壓油被密封在齒間，如圖所示,，稱為困油現(xiàn)象,，因液壓油不可壓縮將使外接齒輪產(chǎn)生極大的振動(dòng)和噪聲，影響系統(tǒng)正常工作,。
困油現(xiàn)象
措施：rexroth齒輪泵在前后蓋板或浮動(dòng)軸套上開卸荷槽,，開設(shè)卸荷槽的原則：兩槽間距為zui小閉死容積，而使閉死容積由大變小時(shí)與壓油腔相通,，閉死容積由小變大時(shí)與吸油腔相通,。
卸荷槽
泄漏現(xiàn)象
rexroth齒輪泵的泄漏較大，外嚙合齒輪運(yùn)轉(zhuǎn)時(shí)泄漏途徑有以下三點(diǎn)：一為齒輪頂隙,，其次為測隙,，第三為嚙合間隙。
其中端面?zhèn)认缎孤┹^大,，占總泄漏量的80%-85%,，當(dāng)壓力增加時(shí)，前者不會(huì)改變,，但后者撓度大增,，此為外嚙合齒輪泵泄漏zui主要的原因，容積效率較低,，故不適合用作高壓泵,。
解決方法：端面間隙補(bǔ)償采用靜壓平衡措施，在齒輪和蓋板之間增加一個(gè)補(bǔ)償零件,，如浮動(dòng)軸套,、浮動(dòng)側(cè)板。
rexroth齒輪泵浮動(dòng)側(cè)板
受力不均衡現(xiàn)象
右側(cè)是壓油腔,，rexroth齒輪泵左側(cè)是吸油腔,，兩腔的壓力是不平衡的；另外壓油腔因齒頂泄漏,，其壓力為遞減,。兩不均衡壓力作用于齒輪和軸稱徑向不平衡壓力,，油壓越高，該力越大,，加速軸承磨損,，降低軸承壽命，使軸彎曲,，加大齒頂與軸孔磨損,。
防止措施：采用壓力平衡槽或縮小壓油腔。
德國力士樂齒輪泵力士樂泵
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REXROTH齒輪泵