Planet Bearing Design of Slewing Planetary Gearbox

AbstractIn order to meet the service life of planetary gearbox, a planet bearing, well known as the component with the highest failure rate, is designed. To predict the bearing fatigue life, ISO standard(ISO/TS 16281) is used, and the design parameters of the bearing are optimized using a parametric method. The whole planetary gearbox model is developed using a commercial software to calculate loads acting on planet bearings accurately. The results state that the designed bearings are satisfied with the life of 15,000hours, and the bearings that consist of 22rollers of 58mm have 1.6times longer life and better load sharing relatively than 22rollers of 28.5mm. Also, the increase in preload of taper roller bearings on the output pinion shaft prolongs the life of planet bearings regardless of roller's length. Key Words : Planet bearing(유성기어 베어링), Planetary gearbox(유성 기어박스), Bearing fatigue life(베어링 피로 수명 ), Needle roller bearing(니들 롤러 베어링 ), Dynamic load rating(동정격 하중), Dynamic equivalent load(동등가 하중)