REXROTH齿轮泵
    力士乐（Bosch Rexroth）为工业及工厂自动化、预*预*预*预*预*预先进行走机械、以及可再生能源等领域的客户提供传动、控制与移动解决方案；作为超过50万客户的共同选择，力士乐正不断为客户提供高质量的电控、液压、气动以及机电一体化元件和系统。
bosch rexroth不仅是*强公司，也是世界较有名高科技企业之一，50多年来，Bosch Rexroth集团及Bosch Rexroth公司的业务部门致力于开发专业型液压传动领域高科技产品，其产品和品牌已享誉。 力士乐的产品是*的，因为在各国市场上，目前没有其他的品牌能向顾客提供所有传动与控制技术，专门化与一体化并举。正因如此，博世-力士乐在液压传动、控制及移动技术等领域成为了标志性的榜样。
    是依靠泵缸与啮合齿轮间所形成的工作容积变化和移动来输送液体或使之增压的回转泵。rexroth齿轮泵由两个齿轮、泵体与前后盖组成两个封闭空间，当齿轮转动时，齿轮脱开侧的空间的体积从小变大，形成真空，将液体吸首*首*首*首*首*首先进入，rexroth齿轮泵齿轮啮合侧的空间的体积从大变小，而将液体挤首*首*首*首*首*首先进入管路中去。吸首*首*首*首*首*首先进入腔与排出腔是靠两个齿轮的啮合线来隔开的。齿轮泵的排出口的压力*取决于泵出口处阻力的大小。

REXROTH齿轮泵优缺点：
优点：rexroth齿轮泵结构简单紧凑、体积小、质量轻、工艺性好、价格便宜、自吸力强、对油液污染不敏感、转速范围大、能耐冲击性负载，维护方便、工作可靠。
缺点：rexroth齿轮泵径向力不平衡、流动脉动大、噪声大、效率低，零件的互换性差，磨损后不易修复，不能做变量泵用。

rexroth齿轮泵困油现象
原因：rexroth齿轮泵液压油在渐开线齿轮泵运转过程中，因齿轮相交处的封闭体积随时间改变，常有一部分的液压油被密封在齿间，如图所示，称为困油现象，因液压油不可压缩将使外接齿轮产生极大的振动和噪声，影响系统正常工作。
困油现象
措施：rexroth齿轮泵在前后盖板或浮动轴套上开卸荷槽，开设卸荷槽的原则：两槽间距为zui小闭死容积，而使闭死容积由大变小时与压油腔相通，闭死容积由小变大时与吸油腔相通。

卸荷槽泄漏现象
rexroth齿轮泵的泄漏较大，外啮合齿轮运转时泄漏途径有以下三点：一为齿轮顶隙，其次为测隙，第三为啮合间隙。
其中端面侧隙泄漏较大，占总泄漏量的80%-85%，当压力增加时，前者不会改变，但后者挠度大增，此为外啮合齿轮泵泄漏zui主要的原因，容积效率较低，故不适合用作高压泵。
解决方法：端面间隙补偿采用静压平衡措施，在齿轮和盖板之间增加一个补偿零件，如浮动轴套、浮动侧板。

rexroth齿轮泵浮动侧板
受力不均衡现象
右侧是压油腔，rexroth齿轮泵左侧是吸油腔，两腔的压力是不平衡的；另外压油腔因齿顶泄漏，其压力为递减。两不均衡压力作用于齿轮和轴称径向不平衡压力，油压越高，该力越大，加速轴承磨损，降低轴承寿命，使轴弯曲，加大齿顶与轴孔磨损。
防止措施：采用压力平衡槽或缩小压油腔。


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