汽车主减速器设计说明书

摘要

汽车主减速器是汽车传动中的最重要的部件之一.它能够将万向传动装置产来的发动机转矩传给驱动车轮，以实现降速增扭。

本次设计的是有关十米高一级客车后桥主减速器设计总成。并要使其具有通过性。本次设计的内容包括有：方案选择,结构的优化与改进。齿轮与齿轮轴的设计与校核,以及轴承的选用与校核.并且在设计过程中，描述了主减速器的组成和差速器的差速原理和差速过程。

方案确定主要依据原始设计参数，对比同类型的减速器及差速器，确定此轮的传动比，并对其中重要的齿轮进行齿面接触和齿轮弯曲疲劳强度的校核。而对轴的设计过程中着重齿轮的布置，并对其受最大载荷的危险截面进行强度校核，轴承的选用力求结构简单且满足要求。

主减速器及差速器对提高汽车行驶平稳性和其通过性有着独特的作用，是汽车设计的重点之一。

关键词：主减速器;差速器；转速;行星齿轮；传动比

Abstract

Automobil reduction final drive is one of the best impossible parts in automobile gearing。It can chang speed and driving tuist within a big scope .

The problem of this design is ten meters passager car reduction final unit ，it’ s properly in common use 。The design of scheme，the better design and improvement of structure ，the design and calibration of gear and gear shiftes , and the select of bearings ，and also the design explain the construction of differential action 。

The ting of the scheme desierment main deside。The drive ratio of gear ，according to orginal design parameter and constrasting the same type reduction final drive ang differential assay . It realize planet gear in the design of structure . It put to use alteration better gears transmission in the design of gear ，and compare the root contact tired strength of some important gears and the face twirl tired strength . It eraphaize pay attention to the place of gears。Compare the strength of the biggest load dangraes section。It require structure simple and accord with demand in select of bearings 。

Key words ：Reduction final ，Differential ，Rotational speed ，Plantet gear , Drive ratio