Design and performance analysis of herringbone groove journal bearings for high-speed gear pump

Abstract

Gear pumps are widely used in the aviation field due to their advantages of simple structure, small size, and strong pollution resistance. With the improvement of aircraft performance and the limitation of internal space, the development of small and lightweight aviation gear pumps has become an inevitable trend. However, downsizing and lightweight design of gear pumps can lead to problems such as reduced strength of key components and increased wear, resulting in shortened lifespan and premature failure during service. Among all parts, the journal bearing is the most severely worn part of the gear pump. Therefore, the lifespan of the journal bearing determines the overall lifespan of the gear pump. This article designs the journal bearing based on the radial force of the gear pump and creates herringbone groove on the journal bearing. Through analysis and calculation, it is found that the bearing with herringbone groove has a larger oil film carrying capacity and lower temperature rise, which can provide a new method for the design of high-speed and small-sized gear pump bearings.