间隙比对燃油泵滑动轴承承载特性的影响分析

针对高负载、高转速工况下燃油齿轮泵的滑动轴承因油膜厚度较薄易发生磨损从而导致滑动轴承失效的问题，鉴于间隙比是滑动轴承最小油膜厚度的主要影响因素，以某型燃油泵用滑动轴承为研究对象，通过PumpLinx仿真分析不同间隙比下轴承最小油膜厚度、承载力、压力及温度分布情况等。分析某型燃油泵齿轮轴的挠性变形问题，进而在泵最低转速和最高转速两种工况下，分别分析滑动轴承间隙比与最小油膜厚度、承载力之间的关系，分析轴承温度及周向和径向压力的分布情况。结果表明：在相同的配合间隙比下，油膜厚度减小时，滑动轴承承载能力增加；间隙比减小时，轴承承载能力增加；转速提高时，轴承承载能力增加；无论压力分布还是温升情况，在齿轮轴和滑动轴承配合间隙比最小时情况最佳。

Analysis of Influence of Clearance Ratio on Bearing Characteristics of Sliding Bearing of Fuel Pump

In view of the problem that the sliding bearing of fuel gear pumps is prone to wear due to the thin oil film thickness under high load and high speed conditions, considering that the clearance ratio is the main factor affecting the minimum oil film thickness of the sliding bearing, the sliding bearing of a fuel pump was taken as the research object, the bearing capacity, minimum oil film thickness, pressure and temperature distribution under different clearance ratios were analyzed by PumpLinx software. The flexible deformation of the gear shaft of the fuel pump was analyzed. Then the relationship among the clearance ratio of the sliding bearing, the minimum oil film thickness, and the bearing load-bearing capacity was analyzed under the two working conditions of the minimum and maximum speed. Besides, the distributions of temperature, circumferential and radial pressure of the bearing were analyzed. The results show that the bearing capacity increases with the decrease of oil film thickness under the same clearance ratio, the decrease of the clearance ratio, or the increase of the rotating speed. In addition, regardless of the pressure distribution or temperature rise, it is the best when the clearance ratio between the gear shaft and sliding bearing is the smallest.