汽车、拖拉机上差速器中行星齿轮(图1)的安装基面为球面,球面半径精度要求较高,需要专用量具测量。另外,内孔两端还存在倒角,倒角的长度和角度都是自由公差,因此,其球面半径的万能测量也不同于一般球面的测量。我们在生产实践中总结出一种用平板、量棒、块规和千分尺测量此球面半径的方法,这种测量方法适用于所有球面测量,可达到 The mounting base of the planetary gear in the differential of the car and tractor (FIG. 1) is spherical, and the precision of the spherical radius is high, and a special gauge measurement is required. In addition, there are chamfers at both ends of the bore, chamfer length and angle are free to tolerance, so the universal measurement of spherical radius is different from the general spherical measurement. In our production practice we summarize a method of measuring the radius of a sphere using a flat plate, a measuring stick, a block gauge and a micrometer. This method of measurement is suitable for all spherical measurements and can be achieved