The Fatigue Analyse Of Coaxiality And Mathematical Model Of Mileage And Reliability

Automobile hub-bearing is one of the most important automobile components. Itsreliability and fatigue life is the most important research. At present, the simulation andfatigue analysis of automobile hub-bearing seldom refer to the coaxiality. The reliabilitymathematical model does not consider shield and seal ring of big influencing on system.Compared with the actual has a lot of errors. The time variable collect more difficult.Variable quantity of mileage is easier to collect than time variable.The mathematicalmodel of mileage and reliability can better reflect the property of hub-bearing. The mainwork and achievements as follows:1Established the contact mechanics models and calculated the inside track contactpoints of stress and strain. By changing the coaxiality, the fatigue simulation model wasperformed. The final conclusion is the the active big or small of the coaxiality has a bigeffect to safety factor. When coaxiality change beyond Oneself adjust range, the safetyfactor of the slope curve changes will be increased, fatigue damage will obviously fasterand worse. The coaxiality is the main factor to affect the fatigue. when the coaxial oferror is too large,the factor becomes stable trend and close to or even less than1.At thistime in obvious bearing security hidden danger or fatiguedamage to the state.2Established the Series simplified model, according to the Truncated themaximum likelihood estimate sample. Automobile hub-bearing is more reasonabledivided into subsystem. This model especially put to use datas of seal and shieldcollected from Return Parts. Establish the model for variable mileage and calculatemodel variables by matlab.The conclusion is obtained that the probability of failureappear relatively is when your mileage is small，inner ring>running pulley>outer ring；too big inner ring> outer ring>running pulley; inside>outside. The sealing system canhave a great impact on system. The process is early and steady. Establishing a newmodel has a correct meaning on previous model.