Reliability Prediction of Gear Transmissions

Service life of any individual transmission gears is known to represent a stochastic value. The methods of predicting gearing reliability as a relation of the acting and permissible stress distributions are described. The probability of transmission gear non-failure service is considered with most characteristic failure modes such as the tooth breakage and plastic deformation of the tooth working surfaces under a short-term maximal dynamic loading and the bending and contact fatigue under prolonged service loads. The employment of different statistical distribution parameters for gear reliability prediction is considered. A practical example of gearing reliability prediction is given.