완화 홈에 의한 액슬구동축의 응력집중 저감

An axle drive shaft has an important role such as transferring power and changing steering angle between axle and wheel in power train system. It has been requiring a high reliability in the power train system. But fatigue failures of the axle drive shaft with a long span length have been reported that a relative high stress concentration occurred at a snap ring groove machined on the drive shaft causes significant fatigue damages under repeated loading condition. In this study, a relief groove in the vicinity of the snap ring groove was applied which is well known as decreasing the stress concentration and improving the fatigue life of axle drive shaft suggested by Peterson. Using FEM analysis, the decreasing effect of the stress concentration and the extended fatigue life were estimated due to change of design parameters related to the size and location of the relief groove. The relief groove with the design parameters such as d/b=2 and r/h=1.2 enabled to decrease the stress concentration of 22.3% and increase the fatigue life more than 3 times in comparison to that without relief groove application.