Abstract: In this experiment, it is the first time that the mean values of center oil film thickness between W-n helical gear teeth profiles are measured indirectly through measuring the change of gaps of a pair of unloaded in volute spur gears mounting on the outside of W-N gear box by means of laser transmission method. During the measurement of every time, it is standardized separately, so that all errors could be eliminated completely except ones of measuring apparatus. The accuracy of this method has reached 0.1μm(dynamite) and 0.01μm(static) respectively. Measurement results are identical with theoretical ones. This method is also suitable for the measurement of center oil film thickness between profiles of cylindrical spur and helical gears.

Key words: 测量, 激光, 双圆弧齿轮, 油膜厚度