沈斌分享 http://blog.sciencenet.cn/u/bshen 同济大学中德学院机械工程系主任、制造执行系统(MES)分会理事长

博文

电动巴士三档自动变速器液压系统的设计与仿真

已有 1836 次阅读 2019-8-26 09:54 |个人分类:硕士研究生毕业论文|系统分类:论文交流|关键词:学者| 自动变速器, 液压系统, 设计, 仿真, SimulationX |文章来源:转载

 

硕士学位毕业论文

硕士研究生:贾振铎

指导教师:沈斌 教授 

答辩时间:2014.06


摘要

电动汽车作为新能源汽车,因其采用清洁能源、无尾气排放、低噪音、电动机效率高、结构简单等特点已成为各汽车厂商重点研发的对象,电动巴士是新型环保的交通工具,对缓解城市环境压力具有重要意义。由于电动汽车驱动与传动原理均不同于传统汽车,因此其自动变速器的设计要适应电动汽车自身的特点进行,液压系统是自动变速器的控制中枢,它可控制自动变速器换档,并为自动变速器的传动系统提供冷却润滑油液。本文为电动巴士的三档自动变速器设计一套液压系统,并对该液压系统进行整体三维建模,然后利用多学科CAE仿真软件ITI SimulationX对液压系统进行动态特性仿真。论文研究的主要内容如下:

1.阐述论文研究背景及意义,分析国内外自动变速器液压系统发展与研究现状。

2根据电动汽车自动变速器的设计要求,在分析电动汽车三档自动变速器工作原理的基础上,通过动力分析和运动分析,确定了液压系统主要参数,绘制了液压系统工作原理图,完成了液压系统功能原理设计和结构设计。

3.设计了液压系统各功能部件。选择液压泵的类型为摆线泵,根据液压系统油液流量、压力等参数,对摆线泵进行了结构设计,应用KISSsoft软件对摆线泵主轴进行强度校核。利用计算软件MathCAD建立限压阀、安全阀和润滑系统节流孔的数学模型,设计并优化了以上元件和结构的几何参数。设计液压控制阀块,合理布置集成于阀块上的元件。设计阀块、自动变速器箱体及自动变速器前后端盖上的油路。结合液压系统设计要求与实际需要,选择液压系统的电磁阀、骨架油封、O型圈、传感器等元件。利用KISSsoft软件设计计算液压系统所有螺栓、螺钉。在完成液压系统设计方案的基础上,应用3D建模软件Creo Parametric 2.0 对液压系统进行整体三维建模。

4.利用仿真软件ITI SimulationX建立了三档自动变速器液压系统仿真模型,在油温为300C、600C、900C和1200C 时,对液压系统油液压力、流量等参数进行动态特性仿真,通过对仿真结果的分析,验证了液压系统设计方案的可行性,并对具体设计进行了改进。

 

关键词:自动变速器,液压系统,设计,仿真,SimulationX 


ABSTRACT

Electric autos are new energy autos. Because of clean energy, no exhaust emissions, low noise, high efficiency motors, simple structure and other characteristics, they have become the focus of research and design of the automotive manufacturers. Electric buses are an environmentally friendly way of transport. They are a paragon of alleviating the pressure on the urban environment. Because the driving principle of electric autos differs from conventional autos, the automatic transmission of an electric auto is designed to adapt to the characteristics of electric autos themselves. The hydraulic system is the control center of an automatic transmission. It is able to control the shift of an automatic transmission and provide lubricating fluid to cool and lubricate the drive system of an automatic transmission. A hydraulic system for a 3-gear automatic transmission of an electric bus has been designed and was built into 3D models by using the software Creo Parametric 2.0. Based on the multi domain CAE simulation software ITI SimulatonX, the hydraulic system of the automatic transmission was modeled and simulated. The main contents of the research of this thesis are as follows:

1. The technical characteristics and development trend of electric autos and automatic transmissions have been analyzed, the significance of the development of an automatic transmission has been explained. The above mentioned studies laid the foundation for the later research.

2. The design requirements of automatic transmissions have been clarified. The schematic diagram for the working principle of the hydraulic system was designed based on the analysis of the working principle of the 3-gear automatic transmission of the electric bus. The main parameters of the hydraulic system have been determined, the function and structure design of the hydraulic system have been accomplished.

3. The components of the hydraulic system has been designed. Gerotor pump has been selected as the model of the hydraulic pump. It has been designed according to the flow and pressure of the fluid and other parameters of the hydraulic system. The intensity of the principal axis of the pump was then assessed by using the software KISSsoft. The key parameters of the relief valve, the safety valve and the orifices of the lubrication system are calculated and optimized based on the calculation software MathCAD. The hydraulic control valve block of the hydraulic system has been designed with a reasonable arrangement of the elements, which were integrated into the valve block. The oilway of the hydraulic control valve block, the transmission case, the front and rear cover of the transmission have been designed. Three solenoid valves, an oil seal, an O-ring, two temperature sensors and two pressure sensors were designed according to the combination of the design requirements for the hydraulic system and the actual needs. All the bolts and screws in the hydraulic system were calculated and designed by using the software KISSsoft. The hydraulic system was built into 3D models by using the software Creo Parametric 2.0 on the basis of the overall design of the hydraulic system.

4. The simulation model of the hydraulic system was built based on the simulation software ITI SimulatonX and was simulated in an oil temperature of 300C、600C、900C和1200C. The dynamic flow and pressure of the fluid and other parameters for the hydraulic system, have been analyzed based on the results of the simulation. According to the above analysis, the design of the hydraulic system was optimized and its feasibility was verified.

 

Key words: automatic transmission, hydraulic system, design, simulation, SimulationX




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