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轿车钢带无级变速器设计+传动方案的设计+传动比设计+整车动力性计算

更新时间:2010-10-22:  来源:毕业论文

轿车钢带无级变速器设计+传动方案的设计+传动比设计+整车动力性计算
 Metal Belt CVT Design for Automobile ABSTRACT
The metal pushing CVT is a kind of new mechanical frictional type transmission. It provides excellent driving performances including powerful driving capacity, high efficiency, good smoothness, economy, etc. Particularly it is fittest to the spots where driving or medium power and continuously adjusting revolution is necessary. The process of development, basic structure, transmission principle, property characteristic and future trends of CVT are described for its uses of automobile. Metal belt CVT is the ideal vehicle transmission mode, is of national researchers and car companies focus review. The metal belt type continuously variable transmission history of the development, discusses the significance of their research, review of metal belt CVT and foreign research Study, the present situation of the metal belt continuously variable transmission electro-hydraulic control system control strategy trends.
This article outlines the historical development of continuously variable transmission, classification, characteristics, and metal belt type continuously variable transmission basic structure, transmission diagram, working principle and the advantages and disadvantages. According to design requirements, conducted a drive in the design, transmission design and vehicle power than calculated. Metal pulley transmission control program design, the design of metal belt, clutch, intermediate reducer, reducer, planetary gear mechanism design and computational geometry. Every major sector of the transmission parameters of the design was checked, including three clutch, continuously variable transmission mechanism, planetary row, reducer, differential and so on .According to the design of each axis diagram, on the shaft and bearing to complete the strength calculation and lifetime calculations.六~维^论,文.网http://www.lwfree.cn
Key words: strip infinitely variable CVT transmission design developing tendency
摘  要钢带无级变速器是一种新型的机械摩擦式无级变速器,具有承载能力强、效率高、平稳性好、环保节能等优良的传动特性,它特别适用于需要传递中大功率而又需无级调速的场合。主要以其在轿车中的应用介绍了它的发展过程和现状,基本结构,传动原理,性能特点和发展趋势。钢带无级变速传动也是汽车理想的传动方式,是各国研究者和汽车公司研究的重点,回顾了钢带无级变速器的发展历史,论述了其研究的重要意义,评述了金属带式无级变速器的国内外研究现状,展望了钢带无级变速器电液控制系统控制策略研究的发展趋势。
本文概述了无级变速器的发展历史、分类、特点以及金属带式无级变速器的基本结构、传动简图、工作原理以及优缺点。根据设计要求,进行了传动方案的设计、传动比设计和整车动力性计算。对照传动方案进行金属带轮设计、金属带的设计,离合器、中间减速器、主减速器、行星齿轮机构的几何参数设计和计算。对变速器各个重要机构的参数设计进行了校核,包括三个离合器、无级变速器机构、行星排、减速器、差速器等。根据各个轴的设计简图,对轴和轴承完成了强度计算和寿命计算。
关键词:钢带无极变速 CVT 变速器设计 发展趋势
1  前言
1.1 变速技术发展简介
    汽车变速器是汽车变速器的重要组成成员,由于汽油机控制的额定转矩范围很广,需要用齿轮传动来控制驾驶时汽车速度的变化。早期的汽车传动系,从发动机到车轮之间的动力传递性是很简单的,发动机驱动一组锥齿减速齿轮,在传递到一根轴和皮带轮上。皮带轮和驱动桥上的链轮之间采用皮带传动,小链轮通过在一个驱动轮上的内齿轮啮合,使汽车行驶,而大链轮用来进行汽车加速。如果汽车遇到上坡,此时汽车爬坡能力不够时,驾驶员就停下车子,是小链轮啮合后再驱动汽车。
    按传动比的变化方式划分,变速器可分为有级式、无极式和综合式3种;按操纵方式划分,可分为强制操纵式、自动操纵式和半自动操纵式3种。近年来,随车车辆技术的进步和汽车密度的加大,对变速器的性能要求也越来越高,众多的汽车工程师在对汽车变速器性能的研究中倾注了大量的心血,使得变速器技术取得了飞速发展。六~维^论,文.网http://www.lwfree.cn
1.1.1 MT手动变速器
MT的英文全称是(manual transmission)中文称为手动变速器。即用手拨动变速杆才能改变变速器内的齿轮啮合位置,改变传动比,从而达到变速的目的。MT变速箱是目前使用最广泛的变速器,未来手动变速箱的发展趋势是档位不断提高,以使发动机的转矩和转速更好地匹配汽车复杂的工况需求。 1606

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