随着机械制造工业的发展,目前在许多机床上已经广泛地采用了液压传动。而液压传动中又是通常采用所谓双作用式的叶片油泵。 叶片油泵如图1,是由泵体1及镶于泵体内的环状定子2所组成。定子的内孔是椭圆形,如图2,由半径Ri和 Ra构成,中间以阿基米德螺旋线相接。短径 Ri的包含角度 With the development of the machinery manufacturing industry, hydraulic transmission is now widely used on many machine tools. The hydraulic transmission is usually the so-called double-acting vane pump. Blade oil pump shown in Figure 1, is composed of a pump body 1 and a ring-shaped stator 2 in the pump body. The stator bore is oval, as shown in Figure 2, by the radius Ri and Ra composition, the middle to Archimedes helix phase. The included angle of the short path Ri