daili美国原装威格士柱塞泵，是由电动机提供泵的动力，经鼓型齿联轴器带动减速机转动。由减速机减速带动曲轴旋转。通过曲柄连杆机构，将旋转运动转变为十字头和柱塞为往复运动。当柱塞向后死点移动时，泵容积腔逐步增大，泵腔内压力降低，当泵腔压力低于进口压力时，吸入阀在进口端压力作用下开启，液体被吸入；当柱塞向前死点移动时，泵腔内压力增大，此时吸入阀关闭，排出阀打开，液体被挤出液缸，达到了吸入和排出的目的。
daili美国原装威格士柱塞泵滑靴与斜盘的滑动磨擦是斜盘柱塞泵三对磨擦副中zui为复杂的一对。 出柱塞杆球头与滑靴球窝的间隙，如果柱塞与滑靴间隙超差，柱塞腔中的高压油就会从柱塞球头与滑靴间隙中泄出，滑靴与斜盘油膜减薄，严重时会造成静压支承失效，滑靴与斜盘发生金属接触磨擦，滑靴烧蚀脱落，柱塞球头划伤斜盘。柱塞杆球头与滑靴球窝超出公差1.5倍时，必须成组更换之
柱塞往复运动总行程L是不变的，由凸轮的升程决定。柱塞每循环的供油量大小取决于供油行程,供油行程不受凸轮轴控制是可变的。供油开始时刻不随供油行程的变化而变化。转动柱塞可改变供油终了时刻，从而改变供油量。柱塞泵工作时，在喷油泵凸轮轴上的凸轮与柱塞弹簧的作用下，迫使柱塞作上、下往复运动，从而完成泵油任务，泵油过程可分为以下三个阶段。
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