齿轮泵：轮泵是液压泵中结构简单的一种泵，它的抗污染能力强，价格便宜。但一般齿轮泵容积效率较低，轴承上不平衡力大，工作压力不高。齿轮泵的另一个重要缺点是流
量脉动大，运行时噪声水平较高，在高压下运行时尤为突出。
齿轮泵主要用于低压或噪声水平限制不严的场合。一般机械的润滑泵以及非自吸式
泵的辅助泵都采用齿轮泵。
优点:结构简单，工作可靠，维护方便，价格低，自吸性强。
美国威格士VICKERS柱塞泵
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