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美国派克 parker摆线液压马达的特点及分类
从能量转换的观点来看,液压马达是将输入的液压能转换为了机械能,而液压泵正好相反,所以液压泵与液压
达是可逆工作的液压元件,向任何一种液压泵输入工作液体,都可使其变成液压马达工况;反之,当液压马达的
轴由外力矩驱动旋转时,也可变为液压泵工况。因为它们具有同样的基本结构要素--密闭而又可以周期变化的容
积和相应的配油机构。
但是,由于液压马达和液压泵的工作条件不同,对它们的性能要求也不一样,所以同类型的液压马达和液压泵
之间,仍存在许多差别。首先液压马达应能够正、反两个方向旋转,因而要求其内部结构对称;液压马达的转速范
围需要足够大,特别对它的低稳定转速有一定的要求。因此,它通常都采用滚动轴承或静压滑动轴承;其次液压马
达由于在输入压力油条件下工作,因而不必具备自吸能力,但需要一定的初始密封性,才能提供必要的起动扭矩
由于存在着这些差别,使得液压马达和液压泵在结构上比较相似,但不能可逆工作。
液压马达按其结构类型来分可以分为齿轮式、叶片式、柱塞式等型式。按液压马达的额定转速分为高速和低速
两大类。额定转速高于500r/min的属于高速液压马达,额定转速低于500r/min的属于低速液压马达。高速液压
马达的基本型式有齿轮式、螺杄式、叶片式和轴向柱塞式等。它们的主要特点是转速较高、转动惯量小,便于启动
和制动,调节(调速及换向)灵敏庋高。通常高速液压马达输出转矩不大(仅几十Nm到几百Nm),所以又称为高速小
扭矩液压马达。低速液压马达的基本型式是径向柱塞式和摆线式,低速液压马达的主要特点是排量大、转速低,因
此可直接与工作机构连接,不需要减速装置,使传动机构大为简化,通常低速液压马达输出转矩较大(可达几千
Nm),所以又称为低速大扭矩液压马达
美国派克 parker摆线液压马达的工作原理
摆线液压马
以的原理(少齿差原理)制成的内啮合摆线齿轮液压马达,简称摆线
如图,转子与定子是一对摆线针齿啮合副,转子具有zi(zi=6或8)个齿的短幅外摆线等距线齿形,定子具有
Zⅰ 1个圆弧针齿齿形,转子和定子形成Z 1个封闭齿间容积。其中一半处于高压区,一半处于低压区。定子固定不
动,其齿圈中心为02,转子的中心为O。转子在压力油作用下产生的液压力矩以偏心距g为半径绕定子中心02作
星运动,即转子一方面在绕自身的中心O自转的同时,另一方面其中心O又绕定子中心02反向公转,转子在沿定子
滚动时,其进回油腔不断地改变,但始终以连心线oⅰ02为界分成两边,—边为进油,容腔容积逐渐増大;另-—边排
油,容积逐渐缩小,将油液挤岀,通过配油机构,再经油马达出油口排往油箱

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