Helical gear contact analysis of high power marine gearbox

CHAI Huan， CHEN Liang-liang， QIN Chun-jie， HU Xia-xia
（Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology，
Ministry of Education， Zhejiang University of Technology， Hangzhou 310014，China）

Abstract： In order to comprehend the contact distribution in the process of gear meshing of a high power marine gearbox，based on the finite element theory，the surface contact stress of a pair of involute helical gears was analyzed，to get the maximum contact stress in the gear meshing by using of ANSYS/Ls-dyna. The basis for tooth profile modification of involute helical gears was provided. Also，the standard gears and the modified gears were compared and analyzed. The results indicate that the helical gear is safe；the contact stress and tooth root stress are both reduced about 13%，which can effectively eliminate the stress concentration and can provide the basis for tooth profile modification of involute helical gears.
Key words： high power marine gearbox； ANSYS/Ls-dyna； involute helical gears； finite element contact analysis