李伟1，2，李国祥1，白书战1，桑梧海2，孙金辉2，刘莹2，张晓林2,3，韩霏2,3
1.山东大学能源与动力工程学院，山东济南250061；2.康跃科技股份有限公司，山东寿光262718；3.机械工业内燃机增压系统重点实验室，山东寿光262718
摘要：为改善涡轮增压器机械效率及发动机加速性能，分析原轴承系统和轻便轴承系统的旋转部件质量及转动惯量，试验研究原轴承系统和轻便轴承系统的机械效率及发动机加速性能。结果表明：与原轴承系统相比,增压器转速为60 000～80 000 r/min时，轻便轴承系统机械效率改善2.73%～8.08%；增压器转速为60 000～140 000 r/min时，轻便轴承系统润滑油流量减少37.44%～46.75%；发动机带载加速试验及发动机自由加速试验表明，轻便轴承系统加速时间分别减少7.7%和117%。因此,轻便轴承系统可以改善增压器低速段机械效率、发动机加速性能及低速扭矩，是增压器的发展方向。
关键词：涡轮增压器；机械效率；加速性能；转动惯量；轻便轴承系统
Abstract:In order to improve the mechanical efficiency of the turbocharger and acceleration performance of the engine ,the mass and inertia of the rotating parts of the original bearing system and the lightweight bearing system are analyzed, and the mechanical efficiency and engine acceleration performance of the original bearing system and the lightweight bearing system are experimentally studied.The results show that when the speed of the turbocharger is 60 000-80 000 r/min, the mechanical efficiency of the lightweight bearing system increases by 2.73%-8.08%;when the speed of the turbocharger is 60 000-140 000 r/min, the lubricating oil flow of the lightweight bearing system decreases by 37.44%-46.75%;the acceleration time of lightweight bearing system is reduced by 7.7% and 11.7% respectively in the engine acceleration test with load and engine free acceleration test. The study shows that lightweight bearing system can improve the turbocharger′s mechanical efficiency, engine acceleration performance and low speed torque, it is the development direction of the turbocharger.
Keywords:turbocharger;mechanical efficiency;acceleration performance;moment of inertia;lightweight bearing system
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