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大马力重型拖拉机前托架有限元分析

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DOI:10.3969/j.issn.1672-3872.2024.08.041

作  者:程 乾 ,蒋亚波 ,张彬彬 ,白 杨 ,井 仪

(第一拖拉机股份有限公司大拖公司,河南 洛阳 471004)

 

摘 要:【目的】对前托架进行强度分析,得出设计结构的劣势部位并优化,使构造出的托架架构更能满足实际工况需求。【方法】以某重型大马力拖拉机前托架为例,针对拖拉机前托架的整体应力,模拟整机在实际工况下的受力强度,并对其进行静力学分析。通过对实际工况进行极限状态模拟,判断前托架设计存在的缺陷,进行合理布局加强,从而实现最优结构。【结果】模拟的前桥冲击工况下的极限应力为375.2 MPa,位于前托架后部与发动机连接部位,超越了材料的性能参数(250 MPa),材料性能在此部位失效。【结论】基于模拟结果优化设计,增加托架后段壁厚,并在前托架后支座连接处增加圆角过渡后,发生失效的形式工况最大应力由375.2 MPa减少到205.1 MPa,强度增加了22.5%,完全满足复杂条件下的使用要求。

关键词:CAE;重型前托架;结构强度;改进优化

 

Finite Element Analysis of the Front Bracket of a High-Power Heavy-Duty Tractor

Cheng Qian, Jiang Yabo, Zhang Binbin, Bai Yang, Jing Yi

(Large Tractor company, First Tractor Company Limited, Henan Luoyang 471004)

 

Abstract: [Objective] To conduct a strength analysis on the front bracket, identify the weaknesses in the design structure, and optimize it to better meet the actual working conditions of the constructed bracket structure. [Method] Taking the front bracket of a heavy-duty high-power tractor as an example, the overall stress of the tractor front bracket was simulated to determine the stress intensity of the entire machine under actual working conditions, and a static analysis was conducted on it. By simulating the limit state of actual working conditions, identifying the defects in the design of the front bracket, and implementing reasonable layout reinforcement, the optimal structure can be achieved. [Result]The ultimate stress under the simulated front axle impact condition is 375.2 MPa, located at the connection between the rear of the front bracket and the engine, exceeding the material performance parameter (250 MPa), and the material performance fails at this location. [Conclusion] Optimize design based on simulation results, by increasing the wall thickness of the rear section of the bracket and adding a rounded transition at the connection of the front bracket and rear support, the maximum stress of the failure mode was reduced from 375.2 MPa to 205.1 MPa, and the strength increased by 22.5%, fully meeting the requirements for use under complex conditions.

Keywords: CAE; heavy duty front bracket; structural strength; improvement and optimization

 

引文信息:[1]程乾,蒋亚波,张彬彬,等.大马力重型拖拉机前托架有限元分析[J].南方农机,2024,55(8):149-152. 

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