摘要
齿轮齿条升降装置的承载能力是关系自升式海洋平台安全性能的重要因素,对其进行改进从而提高齿轮齿条的承载能力具有重要的工程应用价值。针对齿轮齿条传动失效的主要原因,提出齿条边缘两侧倒圆角及对齿轮齿条变位两种改进方案,并通过有限元分析揭示不同倒角半径和变位系数对齿轮齿条承载能力的影响机制。研究结果表明:倒角后齿轮齿条的应力集中现象具有有明显降低,随着倒圆角半径的增加,齿条最大接触应力先降低后有一定程度的升高,齿轮最大接触应力逐渐增大。变位系数对齿轮的最大接触应力影响较大,对齿条影响较小。倒圆角半径在2 mm^6mm范围内、变位系数为0.5时,能最大限度改善齿轮齿条的接触应力和弯曲应力,提高齿轮齿条的承载能力。
The load bearing capacity of gear and rack system is a very important safety factor for the jack-up offshore platform,so there is an important engineering significant to improve and analyze gear and rack system to increase it. According to the main reason for the failure of the rack and gear,different fillet radius features on both ends of the rack and gear and rack modification were builded,and the effects of the different fillet radius and modification coefficient to the carring capacity of the rack were analyzed by finite element analysis. The results showed that the degree of stress concentration dropped significantly with chamfers on the rack,and with the increase of the fillet radius,the contact stress on the both ends of the rack deceases first then increases to a certain extent. Modification coefficient has a major influence on the maximum contact stress of gear,but has less impact on the racks＇. When the fillet radius is in the range of 2 mm ~ 6 mm,and the modification coefficient is 0. 5,the contact stress and bending stress of gear and rack system can get great improvements,and the load bearing capacity of gear and rack system is increased in the meantime.
出处
《机械强度》
CAS
CSCD
北大核心
2015年第6期1106-1112,共7页
Journal of Mechanical Strength
基金
山东省自然科学基金课题(ZR2010EQ029)
中央高校自主创新基金课题(10CX04028A)资助~~
关键词
自升式海洋平台
齿轮齿条升降装置
倒角
变位系数
Jack-up platform
Gear and rack type jacking system
Fillet
Modification coefficient
