【作者】 王迎新；

【导师】 段树林； 于波；

【作者基本信息】 大连海事大学 ， 船舶与海洋工程， 2005， 硕士

【摘要】 本文阐述了FB-Ⅱ型及MFB-Ⅱ型凸轮型线设计的主要步骤,根据配气正时及柴油机工作条件要求,合理选择缓冲段并优化工作段曲线的特性参数后,使用网格法进行优化设计计算。计算结果表明,FB-Ⅱ型及MFB-Ⅱ型凸轮,在满足对气门和挺柱速度、加速度、跃动度等要求的条件下,采用网格法对FB-Ⅱ凸轮优化,在保证具有良好的换气质量、较低的振动和噪声前提下,使之具有更大的丰满系数。针对传统的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,本文还利用单质量-弹簧动力学模型对装配有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,配气机构各相关特性参数也会发生相应的变化。MFB-Ⅱ型线凸轮对转速低于2000r/min的柴油机是一种比较理想的选择。更多还原

【Abstract】 This paper presents a symmetric valve driven FB-II cam design and calculate procedure. Dynamic calculating method used to check its all kinds of properties including elastic change, during its different working conditions. We carefully select and optimize the performance and character parameters for the FB-II cam. Properties of this air exchange gear can change greatly as the engine speed changes. According to the calculate results, with higher ample factor.And it also presents a symmetric inlet valve driven MFB-II cam design and calculate procedure, according to the requirement of gas exchange timing and engine work condition, we carefully select and optimize the performance and character parameters for the buffer section and foundational section, and then we get a MFB-II cam profile with higher ample factor, but its low velocity and acceleration restricted in a relatively low level. This cam design has an advantage of good gas exchange quality, better stability and low vibration & noise. So MFB-II cam is an ideal selection for engine with a speed not high than 2000 r/m.更多还原