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REXROTH齒輪泵

力士樂（Bosch Rexroth）為工業及工廠自動化、行走機械、以及可再生能源等領域的客戶提供傳動、控制與移動解決方案；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量的電控、液壓、氣動以及機電一體化元件和系統。
bosch rexroth不僅是*強公司，也是世界*高科技企業之一，50多年來，Bosch Rexroth集團及Bosch Rexroth公司的業務部門致力于開發專業型液壓傳動領域高科技產品，其產品和品牌已享譽。 力士樂的產品是*的，因為在各國市場上，目前沒有其他的品牌能向顧客提供所有傳動與控制技術，專門化與一體化并舉。正因如此，博世-力士樂在液壓傳動、控制及移動技術等領域成為了標志性的榜樣。

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來輸送液體或使之增壓的回轉泵。rexroth齒輪泵由兩個齒輪、泵體與前后蓋組成兩個封閉空間，當齒輪轉動時，齒輪脫開側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
優點：rexroth齒輪泵結構簡單緊湊、體積小、質量輕、工藝性好、價格便宜、自吸力強、對油液污染不敏感、轉速范圍大、能耐沖擊性負載，維護方便、工作可靠。
缺點：rexroth齒輪泵徑向力不平衡、流動脈動大、噪聲大、效率低，零件的互換性差，磨損后不易修復，不能做變量泵用。
rexroth齒輪泵困油現象
原因：rexroth齒輪泵液壓油在漸開線齒輪泵運轉過程中，因齒輪相交處的封閉體積隨時間改變，常有一部分的液壓油被密封在齒間，如圖所示，稱為困油現象，因液壓油不可壓縮將使外接齒輪產生極大的振動和噪聲，影響系統正常工作。
困油現象
措施：rexroth齒輪泵在前后蓋板或浮動軸套上開卸荷槽，開設卸荷槽的原則：兩槽間距為zui小閉死容積，而使閉死容積由大變小時與壓油腔相通，閉死容積由小變大時與吸油腔相通。
卸荷槽
泄漏現象
rexroth齒輪泵的泄漏較大，外嚙合齒輪運轉時泄漏途徑有以下三點：一為齒輪頂隙，其次為測隙，第三為嚙合間隙。
其中端面側隙泄漏較大，占總泄漏量的80%-85%，當壓力增加時，前者不會改變，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：端面間隙補償采用靜壓平衡措施，在齒輪和蓋板之間增加一個補償零件，如浮動軸套、浮動側板。
rexroth齒輪泵浮動側板
受力不均衡現象
右側是壓油腔，rexroth齒輪泵左側是吸油腔，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