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针对传统运动学计算不足以准确描述配气机构各零部件的运动规律的问题,阐述了对用复合形法优化了的FB-Ⅱ凸轮,利用单自由度模型对FB-Ⅱ型对称凸轮的下置凸轮轴式配气机构进行动力学计算.计算结果表明,在工作状态下,配气机构各个零部件会发生较大变形;当凸轮轴转速变化时,配气机构各相关参数会发生相应的变化.FB-Ⅱ凸轮配气机构具有较大的丰满系数.FB-Ⅱ型线凸轮对转速低于3000r/min的柴油机是一种比较理想的选择.
Aiming at the problem that the traditional kinematics calculation is not enough to accurately describe the movement rules of each component of the valve train, the FB-Ⅱ cam optimized by the complex method is expounded. By using the single degree of freedom model, The camshaft gas distribution mechanism is used to carry out the dynamic calculation.The calculation results show that under the working condition, the various components of the gas distribution mechanism will be greatly deformed; when the camshaft rotational speed changes, the relevant parameters of the gas distribution mechanism will occur correspondingly Change.FB-Ⅱ cam valve with a larger body fullness coefficient.FB-Ⅱ-type cam for the speed of less than 3000r / min of the diesel engine is an ideal choice.