Gears are important parts of mechanical products and have been widely used in various industries.A spur gear was broken early in a transmission chain.This article starts with the breakage fault of the gear.The process...Gears are important parts of mechanical products and have been widely used in various industries.A spur gear was broken early in a transmission chain.This article starts with the breakage fault of the gear.The processes of fault analysis and improvement countermeasure were comprehensively sorted out based on fault tree,and the relevant influencing factors which affect the life of gears were examined one by one.Through detailed investigation,the abnormal high load on the gears was clarified.The gear design strength reserve did not meet the requirements for customer-specific operating conditions,and further improvements had been made.By optimizing the oil-filling characteristics and timing matching of the hydraulic system,the impact of shift shock was reduced,thereby reducing the load on the gears.At the same time,by increasing the pressure angle of the gear,the gear strength margin was increased from the design point of view.Through the fatigue test on the bench,the gears worked safely.After further verification of the actual vehicle test,the gears worked safely and normally,so the improvement measures were effective.This article provides a useful reference for trouble shooting processes and a problem solving method for similar faults through detailed analysis of factors affecting gear life.展开更多
基金National Defense Advanced Research Fund,China(No.41402050202)
文摘Gears are important parts of mechanical products and have been widely used in various industries.A spur gear was broken early in a transmission chain.This article starts with the breakage fault of the gear.The processes of fault analysis and improvement countermeasure were comprehensively sorted out based on fault tree,and the relevant influencing factors which affect the life of gears were examined one by one.Through detailed investigation,the abnormal high load on the gears was clarified.The gear design strength reserve did not meet the requirements for customer-specific operating conditions,and further improvements had been made.By optimizing the oil-filling characteristics and timing matching of the hydraulic system,the impact of shift shock was reduced,thereby reducing the load on the gears.At the same time,by increasing the pressure angle of the gear,the gear strength margin was increased from the design point of view.Through the fatigue test on the bench,the gears worked safely.After further verification of the actual vehicle test,the gears worked safely and normally,so the improvement measures were effective.This article provides a useful reference for trouble shooting processes and a problem solving method for similar faults through detailed analysis of factors affecting gear life.
