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为了简化变位齿轮传动的几何计算,在封闭图的座标系X_1、X_2〔1、2〕中,可作变位系数和X_1+X_2=X_Σ的直线NN,与座标轴呈45°倾角。在此线上表示传动的几何参数。实际上,对于齿数巳知的齿轮传动中任一变位系数和X_Σ,将可知道中心距和啮合角,以及中心距变动系数和齿顶高变动系数。由此可知,在直线NN上的任意点所指的数值将具有同样的大小。图中所示的为Z_1=20、Z_2=50的传动在座标系X_1、X_2上的封闭图。对于每一X_Σ值,
In order to simplify the geometric calculation of variable gear transmission, the straight line NN with displacement coefficient and X_1 + X_2 = X_Σ in the closed coordinate system X_1, X_2 [1,2] can be inclined at 45 ° to the coordinate axis . This line shows the geometry of the drive. In fact, for any given displacement coefficient and X_Σ in a gear train known to the tooth number, the center distance and the engagement angle, as well as the center distance variation coefficient and the tooth tip top variation coefficient, can be known. From this, it can be seen that the numerical value at any point on the straight line NN will have the same size. Shown in the figure for the Z_1 = 20, Z_2 = 50 transmission in the coordinate system X_1, X_2 on the closed map. For each X_Σ value,