一些从国外引进的柴油机,其凸轮图纸上往往只有升程表或理论轮廓的向径数据,而没有工作轮廓的向径值。但不论是加工标准凸轮或凸轮样板,还是检查凸轮线形都需要知道凸轮的工作向径尺寸,因此,必须限据图纸给定的理论轮廓向径求出凸轮工作轮廓向径值。现以从国外引进的RLA56船用柴油机燃油凸轮为例,说明这种计算方法。该凸轮向径尺寸公差为±O.1mm,精度较高,因而只能用解析法求其工作向径数值而不能用作图法。具体求解步骤如下: Some imported from abroad, diesel engine, the cam drawings often only lift or theoretical profile of the radial data, and the working profile of the radial value. However, it is necessary to know the working radial size of the cam whether machining a standard cam or a cam model or checking the cam linearity. Therefore, the diameter of the cam working profile must be determined according to the theoretical profile diameter given by the drawings. The introduction of RLA56 marine diesel fuel cam from abroad as an example to illustrate this method of calculation. The cam diameter diameter tolerance of ± O.1mm, high accuracy, and therefore can only be used analytically to find its value to the diameter and can not be used as a map method. Specific solution steps are as follows: