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 改变倾斜元件的角度，就可以改变柱塞在泵缸内的行程长度，即可改变泵的流量。倾斜角度固定的称为定量泵，倾斜角度可以改变的便称为变量泵。
液压齿轮泵由一个独立的电机驱动，可有效地阻断上游的压力脉动及流量波动。在齿轮泵出口处的压力脉动可以控制在1%以内。在挤出生产线上采用一台液压齿轮泵，可以提高流量输出速度，减少物料在挤出机内的剪切及驻留时间。
外啮合齿轮泵是应用较广泛的一种液压齿轮泵，一般液压齿轮泵通常指的就是外啮合齿轮泵。主要有主动齿轮、从动齿轮、泵体、泵盖和安全阀等组成。泵体、泵盖和齿轮构成的密封空间就是齿轮泵的工作室。
两个齿轮的轮轴分别装在两泵盖上的轴承孔内，主动齿轮轴伸出泵体，由电动机带动旋转。外啮合齿轮泵结构简单、工作可靠、应用范围广。
齿轮泵是液压系统中广泛采用的一种液压泵，它一般做成定量泵，按结构不同，齿轮泵分为外啮合齿轮泵和内啮合齿轮泵，而以外啮合齿轮泵应用较广。下面以外啮合齿轮泵为例来剖析齿轮泵。
液压齿轮泵主要包括：高压定量齿轮泵，高压双联齿轮泵，润滑泵，化工泵，双向齿轮马达，齿轮泵附调压阀，齿轮泵附升降阀。 一、柱塞泵
    轻型通轴式柱塞泵是一种压力较低、结构较简单，成本较低，质量较小的经济型轴向泵。在国外。价格仅比变量叶片泵高20%左右，但其效率却比叶片泵高5%左右。寿命也比叶片泵长，变量形式多，体积、质量和噪声均接近变量叶片泵。
    二、点接触轴向柱塞泵和马达
    点接触轴向柱塞泵和马达主要特点是柱塞与斜盘之间没有滑履，为点接触。若做泵用，因为无自吸能力，须加柱塞回程弹簧或用辅助泵供油，而且只限于中、低压和小排量泵中用。大多用作马达，因其低速稳定性和换向灵敏性好。


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