两级式可变气门升程机构切换行程的试验研究  

Experimental Study on the Switching Stroke of the Dual Variable Valve Lift Mechanism

作　　者：刘宗鑫 何伟 李广乐[1] 任健康[1] 程传辉 徐政 LIU Zongxin;HE Wei;LI Guangle;REN Jiankang;Cheng Chuanhui;XU Zheng(SAIC Motor Technical Center(Shanghai,201804,China);Shanghai Key Laboratory of Automobile Powertrain)

机构地区：[1]上海汽车集团股份有限公司技术中心,上海201804 [2]上海市汽车动力总成重点实验室

出　　处：《小型内燃机与车辆技术》2022年第2期19-22,34,共5页Small Internal Combustion Engine and Vehicle Technique

摘　　要：在配气机构性能测试台架上,利用激光测量仪,针对一款两级式可变气门升程机构三种不同设计状态的凸轮轴套筒进行了不同发动机转速、螺旋槽行程和弹簧预紧力对切换行程影响的测试。结果表明:凸轮轴套筒的轴向位移结果随着发动机转速的升高而增大,当发动机转速高于1 300r/min时,三种凸轮轴套筒的轴向位移结果均出现过冲;螺旋槽行程增大,将引起凸轮轴套筒的强制切换行程增大,有利于DVVL的切换精度;通过采取钢球初装高度增高、钢球槽止推角增大等措施所引起的弹簧预紧力的减小,提升了DVVL的切换精度。The effect of the engine speed, spiral groove stroke and spring preload on the switching stroke for the camshaft sleeves in three different design states of the DVVL(dual variable valve lift) mechanism were explored in valve train performance test bench by using laser measuring instrument. The results show that the camshaft axial displacement increased with engine speed, and the axial displacement of the three camshafts all overshoot when engine speed was higher than 1300 r/min. The increase of the spiral groove stroke would cause the forced switching stroke of the camshaft sleeve to increase, which was beneficial to the switching of DVVL mechanism. The reduction of the spring preload force by increasing the initial installation position of the ball and the thrust angle of the ball groove was conducive to the switching of DVVL mechanism.

关 键 词：汽油发动机 两级可变气门升程 切换行程 气门升程 

分 类 号：TK413.41[动力工程及工程热物理—动力机械及工程]