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基于Carreau流变模型的渐开线齿轮摩擦因数研究
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国家高技术研究发展计划(863计划)项目(2012AA110701).


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    摘要:

    结合载荷分担概念和弹流润滑理论,研究润滑剂的流变性对渐开线齿轮油膜厚度、摩擦因数等润滑特性的影响;分别采用Carreau流变模型和Doolittle-Tait自由体积黏度模型描述润滑剂的剪切稀化特性及黏压关系,研究齿轮载荷、转速、表面粗糙度和润滑剂压黏系数对摩擦因数的影响。研究结果表明:不同的润滑剂剪切稀化特性不同,因此油膜厚度、油膜承载比例和摩擦因数均不同;摩擦因数随着转矩的增大先显著增大,当超过某一转矩值时,摩擦因数开始缓慢变化;摩擦因数随着转速的增加先显著减小,当转速增加至某一值时摩擦因数又随之增大;随着表面粗糙度和润滑剂压黏系数的增大,摩擦因数均明显增大。

    Abstract:

    Study on the friction coefficient of the tooth surface plays an important role on reducing friction loss and improving the system transmission performance.The effects of the rheological behavior of lubricants on the film thickness and the friction coefficient along the line of action of involute spur gear were studied by employing the load sharing concept and elastohydrodynamic lubrication theory.Carreau rheological model was used to describe the shearing thinning behavior and the Doolittle’s free volume equation was used to represent the pressure-viscous relation.The effects of the load,rotational speed and surface roughness of gear and the pressure-viscous coefficient of lubricants on the friction coefficient were also studied,and comparisons between the results from two different lubricants were given.The results show that shearing thinning behavior affects the oil film thickness,the oil film load scaling factor and the friction coefficient significantly.The torque,rotational speed and surface roughness of gear and the pressure-viscous coefficient have a great influence on the friction coefficient.With the increasing of input torque,the friction coefficient firstly becomes larger dramatically,then changes slowly as the torque exceeds a certain value.As rotational speed increases,the friction coefficient is firstly decreased evidently,then becomes larger at a certain rotational speed.The friction coefficients are all increased along with the increasing of the surface roughness of gear and the pressure-viscosity coefficient of lubricants.

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邹玉静,常德功.基于Carreau流变模型的渐开线齿轮摩擦因数研究[J].润滑与密封,2015,40(3):40-46.
.[J]. Lubrication Engineering,2015,40(3):40-46.

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  • 在线发布日期: 2015-04-27
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