多功能消防车动态取力器设计与优化

Design and Optimization of Dynamic Power Take-Off forMultifunctional Fire Engine

以大功率消防车多功能动力输出系统为研究对象,设计了一种动态取力器,并且对取力器进行了优化分析。首先对取力器进行整体设计,对重要零件进行三维数字建模,然后运用有限元分析方法对主要零件进行强度分析和稳态散热分析,最后进行了结构设计优化,优化后箱体1阶固有频率为282.21 Hz,较优化前降低12.69 Hz,同时远远高于变速器和油泵外界激励,因此,改进后的取力器箱体结构依旧满足动态特性要求,保证了取力器的动力性、经济性和可靠性。

This paper takes the multi-functional power output system of high-power fire engine as the research object,a dynamic power take-off is designed,and the power take-off is optimized and analyzed.Firstly,the overall design of the power take-off is carried out,and the three-dimensional digital modeling of important parts is carried out.Then the finite element analsis method is used to analyze the strength and steady-state heat dissipation of main parts.Finally,the structural design is optimized,the first order natural frequency of the box is 282.21 Hz,which is 12.69 Hz lower than that before optimization,and far higher than the external excitation of the transmission and oil pump.Therefore,the improved box structure of the power take-off still meets the dynamic characteristics,which ensures the power,economy and reliability of the power take-off.