This paper resents an indirect method to evaluate running stability of hypoid gears

in which the sign of vibration of driven shaft bearing housing in the rolling checker is detected as a measure value of running stability of meshing gears. The main features of this method are: （1） the running stability of meshing gears can be quantitively evaluated in a rolling checker without changing any structure of the rolling checker and （2） the causes of flaw in the quality of gears can be diagnosed with frequency domain analysis. The experimental results showed that the method is very effective and can be applied to hypoid gear manufacturing process to improve its quality.