复合表面径向滑动轴承的概念和性能预报

近年来的研究发现固液界面的滑移可以减小表面摩擦,但也会造成流体动力效应下降甚至消失.本文提出了复合表面滑动轴承的概念,轴套表面由具有不同吸附和滑移特性的复合表面组成,发现复合表面轴承比普通轴承有许多优点.通过改变轴套表面的滑移特性可以改变和优化轴承的各种性能,例如摩擦系数、承载力、润滑剂流量、承载角等.数值解表明,在轴承高压区改变轴套表面滑移特性,轴承的整体性能会有大幅度提高.例如,本文给出的初步优化设计方案使得摩擦系数降低50%以上,同时承载力可提高20%,并且承载角可以降低33%.本文提出的设计理念不但可用于设计出具有更优异特性的径向滑动轴承,而且可以设计出具有复合表面的轴向滑动轴承或滑块轴承.复合表面滑动轴承在降低轴承摩擦、提高承载能力方面有很大的空间可以探索.

Concept and performance prediction of a journal sliding bearing with composite surfaces

During recent years it was found that slippage on a solid-liquid interface could give rise to a considerable friction drag reduction,but it could also cause a dramatic reduction of the hydrodynamic response.This paper presents a concept that the bearing surface of a journal sliding bearing consists of composite slip surfaces with different surface adhesion and slip properties.It was found that such a bearing exhibits many unusual advantages over the traditional bearings.Many properties,such as friction coefficient,load support capacity,lubricant flow,load support angle,etc,can be changed and optimized by changing the slippage property of the bearing surface.Numerical solutions showed that optimization of the slippage property of bearing surface in the high-pressure region could enhance greatly the performance of the journal bearing.For example,the primary optimization design in the present paper shows that the surface friction coefficient is reduced by about 50%,the load support capacity is increased by about 20%,and load support angle is reduced by 33% compared with a no-slippage traditional journal bearing.The present concept can be used not only to design a more outstanding journal bearing but also to design a thrust bearing or a slider bearing with an outstanding performance.There is a large space to explore in the area to reduce friction and increase the load support capacity of a sliding bearing with composite surfaces.