Accelerated life test method for speed reducer of industrial robot

An accelerated life test method for a speed reducer of an industrial robot, comprising:

• setting a first load stress higher than a rated load stress, and a second load stress lower than the rated load stress;
• performing an accelerated life test by loading the first load stress to first speed reducer samples;
• calculating a service life of each of the first speed samples in the accelerated life test;
• performing a contrast test by loading the second load stress to second speed reducer samples;
• calculating a service life of each of the second speed samples in the contrast test;
• calculating an acceleration coefficient, wherein the acceleration coefficient is equal to a ratio of the service life in the accelerated life test to the service life in the contrast test;
• estimating a lifetime of the speed reducer according to the acceleration coefficient;
• and servicing or replacing the speed reducer before it has reached its estimated lifetime.