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大部分工厂测量渐开线齿轮齿形时,为简化计算,是按被测齿轮和标准齿条啮合的情况计算起始测量点的,并没有根据实际使用时齿轮对啮来计算。有人疑惑这样能否保证使用质量,即齿轮与齿条啮合的长度和该齿轮和配对齿轮啮合的长度,究竟哪一个长?我们对此进行了分析。为了方便起见,我们选被测齿轮为直齿不变位齿轮,该齿轮模数m,齿数Z_1;,压力角为α。 图1是齿轮对啮情况,O_1是被测齿轮圆心,O_2是与之对啮的齿轮,齿数为Z_2。O_1的顶圆交啮合线AD于C点,O_2的顶圆交啮合线AD于B点。BC即为此状态下,被测齿轮的啮合长度,用L_（齿轮）表示。
Most factories measure involute gear tooth profile, in order to simplify the calculation, according to the measured gear and standard gear meshing situation to calculate the initial measurement point, and not according to the actual use of the gear pair to calculate. Is there any doubt as to whether such quality can be guaranteed, ie the length of the gear meshing with the rack and the length of meshing between the gear and the counter gear, which one is long? We have analyzed this. For convenience, we choose the gear to be measured straight tooth unchanged gear, the gear modulus m, the number of teeth Z_1 ;, pressure angle α. Figure 1 is the gear on the situation, O_1 is the center of the measured gear, O_2 is the gear with the mesh, the number of teeth Z_2. The top circle of O_1 intersects the AD at point C, and the top circle of O_2 meets the line AD at point B. BC is this state, the measured gear meshing length, with L_ (gear) said.