In order to further improve the reliability and availability of gearboxes on metro vehicles,this paper takes a mature brand gearbox as the research object,draws a functional block diagram of the gearbox,and uses fault mode,effect and criticality analysis(FMECA)methods to analyze gearbox fault mode,fault cause,fault impact and hazard degree.Major hazardous fault modes and the trend of component failure within one overhaul cycle are obtained.Research results show that fault modes such as oil leakage at the injection and discharge ports,oil leakage at the sealing ring,and foreign objects in the lubricating oil rank high in terms of the harmfulness.The harmfulness of gearbox failure after a running distance of 100 000 km is relatively high and is the key point for maintenance.Op-timization of material selection,application of sealant to the sealing rings and timely cleaning of the corners in the gearbox casing during design and production,as well as an increase of appearance inspection frequency during ma-intenance,abnormal noise monitoring,and timely cleaning of the gearbox outer surface can significantly improve the reliability and availability of the gearboxes,which therefore could provide some references for the design im-provement and daily maintenance of the gearboxes in this industry.
关键词
地铁车辆/齿轮箱/FMECA/可靠性/维保策略
Key words
metro vehicle/gearbox/FMECA/reliability/maintenance policy
维普
万方数据