文档介绍：毕业设计
直列四缸发动机的曲轴的动平衡设计
机械工程系
学生姓名: 学号:
机械设计制造及其自动化
系部:
专业:
指导教师:
二零一二年六月
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本人郑重声明:本论文及其研究工作是本人在指导教师的指导下独立完成的,在完成论文时所利用的一切资料均已在参考文献中列出。
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直列四缸发动机的曲轴的动平衡设计
摘要
动平衡是指旋转体旋转时由各偏心质量组成的旋转质量系统产生的旋转惯性力合力及合力矩均等于零。内燃机旋转质量系统必须保证一定的动平衡要求,尤其是高速内燃机,否则可能引起很大振动,使轴承和支撑过载。
直列四缸发动机主轴通常采用曲轴夹角为180的四拐五档主轴颈,理论设计是动平衡的,实际使用时,为了改善曲轴内部不平衡,减少主轴承载荷,内力矩以及保证最小油膜厚度等,仍需合理布置平衡重。平衡重的布置方案有多种方案,平衡重数目一般选择8块或4块,我的题目选择8块平衡重。
从自身的方面说,对曲轴的设计,涉及到很多方面的知识,例如建立基本的三维模型的能力,以及对机械原理中动平衡概念的理解以及计算。当然,设计过程中,我的设计只是提供一种理论上关于直列四缸发动机曲轴的动平衡的计算模型,并不是针对某一款发动机的曲轴,只是提供一种计算的模型方法。
关键词:曲轴,平衡重,往复惯性力,往复惯性力矩
Array four urns of song stalks of motors move an equilibrium design
Summary
Move balance to mean constitute to from each partiality quality while revolving a body to revolve of revolve dint resultant force and resultant force ju of the useding to revolve of quality system creation on an equal footing in bustion engine revolves quality system to promise to definitely move a balance request, particularly high-speed bustion engine, otherwise may arouse to vibrate very greatly, make bearings and once propped up to carry.
Array four urns of motor principal axises usually adopt song stalk to clip Cape for 180 of four turn five file principal axis neck, the theory design is to move balance, physically use, for the sake of improvement song stalk internal unbalance, reduce a principal axis loading lotus, inside the dint Ju and assurance minimum oil film thickness etc., still need a reasonable decoration balance balance weighs of the decoration project have various projects, equilibrium heavy the number generally choose 8 pieces or 4 pieces, my topic chooses 8 pieces of balance heavy.
Say from the aspect of oneself, to the design of song stalk, involve to arrive very various knowledge, for example build up the ability of basic 3D model, and to move prehension and calculation of equilibrium concept in the machine process certainly in, my design just provide