[1]刘克铭,张蕾,陶云飞,等.农用柴油发动机变压缩比机构设计及主要部件仿真[J].黑龙江农业科学,2012,(02):120-123.
　LIU Ke-ming,ZHANG Lei,TAO Yun-fei,et al.Variable Compression Ratio Mechanism Design and Main Components Simulation of Agricultural Diesel Engine[J].HEILONGJIANG AGRICULTURAL SCIENCES,2012,(02):120-123.
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农用柴油发动机变压缩比机构设计及主要部件仿真

《黑龙江农业科学》[ISSN:1002-2767/CN:23-1204/S] 卷: 期数: 2012年02 页码: 120-123 栏目: 出版日期: 2012-02-10
Title:
Variable Compression Ratio Mechanism Design and Main Components Simulation of Agricultural Diesel Engine
文章编号:
1002-2767（2012）02-0120-04
作者:
刘克铭1; 张蕾2; 陶云飞1; 杨伟红1; 3
1.辽宁工程技术大学 机械学院，辽宁 阜新123000；
2.阜新嘉隆电子有限公司，辽宁 阜新123000；
3.东北大学 机械工程与自动化学院，辽宁 沈阳 110004
Author(s):
LIU Ke-ming1; ZHANG Lei2; TAO Yun-fei1; YANG Wei-hong1; 3
1.Mechanical Engineering College of Liaoning Technical University，Fuxin，Liaoning 123000;
2.Fuxin Jialong Electronic Limited Company，Fuxin，Liaoning 123000;
3.Mechanical Engineering and Automation College of Northeastern University，Shenyang,Liaoning 110004
关键词:
变压缩比; 活塞; 齿轮齿条; 有限元仿真
Keywords:
variable compression ratio; piston; gear and rack; finite element simulation
分类号:
TK422
文献标志码:
A
摘要:
增大发动机压缩比可提高发动机的动力性，但又会影响其工作的可靠性及寿命，为解决此矛盾，设计了一种农用柴油发动机的变压缩比机构，在发动机不同工况下实现了液压控制的压缩比自动调节，压缩比的变化范围为15~19；在发动机冷启动及中小负荷时压缩比为19，在发动机大负荷时压缩比为15。通过ANSYS有限元软件对活塞组及齿轮齿条进行了仿真，得到了不同压缩比、不同工况下的应力、应变云图。仿真结果表明：活塞组的最大应力出现在活塞顶面凹坑位置，其数值为0.0535 22 MPa；齿轮齿条的最大应力出现在齿轮齿条与传动齿条的啮合位置，其数值为0.198 445 MPa；活塞组的最大应变出现在活塞与活塞杆的连接部位，其数值为0.000 863 mm，齿轮齿条的最大应变出现齿轮齿条与传动齿条啮合齿的根部，其数值为0.003 326 mm，所设计的变压缩比机构能够满足发动机工作要求。
Abstract:
A kind of variable compression ratio mechanism of agricultural diesel engine was designed and it could make the compression ratio of hydraulic pressure control adjust to different working condition change automatically.The range of compression ratio was from 15 to 19.The compression ratio was 19 under the working condition of cold-start and medium-small load.The compression ratio was 15 under the working condition of large load.The stress and strain nephograms under different compression ratio and working conditions were obtained through simulation of gear，rack and piston assembly carried out by ANSYS finite element software.The simulation results showed that:The maximum stress point of piston assembly was at the pit position of piston superface，and its value was 0.053 522 MPa.The maximum stress point of gear and rack was at the meshing position of gear，rack and drive rack，and its value was 0.198 445 MPa.The maximum strain point of piston assembly was at the contact position of piston and piston rod，and its value was 0.000 863 mm.The maximum strain point of gear and rack was at the meshing teeth root position of gear，rack and drive rack，and its value was 0.003 326 mm.The designed variable compression ratio mechanism could satisfy the working requirement of engine.

参考文献/References:

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备注/Memo

基金项目：辽宁工程技术大学优秀青年基金资助项目（07-79）

第一作者简介：刘克铭(1977-)，男，辽宁省阜新市人，博士，讲师，从事发动机动力与排放控制研究。E-mail:liukm2003@yahoo.com.cn。

更新日期/Last Update: 2014-10-26