工程机械用单排四点接触球式回转支承具有优越的技术性能和经济性。这种滚道断面是由四段圆弧组成的。而圆弧几何尺寸的测量与加工是制造这种回转支承的关键。所以,探讨其滚道断面尺寸的表示方法,对于回转支承的制造有着重要的意义。本文提出以两段椭圆(接触角45°)取代四段圆弧的新方法。首先计算滚球与滚道之间的间隙△(见图1,图中△_1和△_2分别代表内圈与外圈的间隙)。 Construction machinery with a single row four-point contact ball slewing bearing with superior technical performance and economy. This raceway section is composed of four arcs. The arc geometry measurement and processing is to create the key to this slewing ring. Therefore, discussing the representation of the raceway section size is of great significance for the manufacture of slewing bearings. In this paper, a new method of replacing four arcs with two ellipses (contact angle 45 °) is proposed. First calculate the gap between the ball and raceway △ (see Figure 1, △ _1 and △ _2 represent the gap between the inner ring and the outer ring, respectively).