LPLi 연료펌프 적용을 위한 저어널 베어링의 설계 적합성 해석

Abstract

In this study a complex design fitness analysis of journal bearings is carried out for the LPLi rotaryvane fuel pump application, as an external and horizontal installation, in LPG vehicles. Bearings considered in the analyses are plain and 3-axial groove journal bearings. Upon reflecting the fact that the primary failure mode of bearings in the application is a premature friction and wear failure of bearing metal due to a very low viscosity of liquid fuel LPG as a bearing lubricant, the performance factors of bearings used in an evaluation process of design fitness are a load carrying capacity and vibration suppression ability relative to a rated speed. At this time the design variables of bearings are a radial clearance and length. Results show that, in terms of both of the load carrying capacity and vibration suppression ability, the plain journal bearings are superior to the 3-axial groove journal bearings and among the plain bearings the smaller the bearing clearance (5>10>15 μm) is and the longer the bearing length (6 <8 <10<12 <14 mm) is, the better the bearing performance is.