摘要:本文介紹了幾種汽車主減速器的構造以及在汽車上的運用。主減速器可以說是驅 動橋的“心臟”，它的好壞直接影響汽車的可靠性、安全性和使用壽命。由于主減速 器的機械零部件在材料與制造工藝等方面上的缺陷或人為使用操控不當造成的損壞， 使得汽車的操作可靠性能下降。汽車驅動橋主減速器在使用過程中的正常磨損和非正 常磨損，對汽車都是有害的。當零件磨損量沒有達到使用極限時，可對汽車主減速器 進行及時的檢修、裝配與調整，消除隱患，延長使用壽命。

　　　由于汽車的驅動橋結構比較復雜又承受各種作用力，因此故障率較高。其中主減 速器在驅動橋中又是最容易出現問題的部件之一。本文針對主減速器主、從動齒輪， 支撐軸承及軸承座的檢修；主、從動齒輪嚙合印跡、嚙合間隙，軸承預緊度的裝配與 調整等進行概述；設計出一合理的修理工藝，以便使主減速器在裝配時，有一個正確 的方法，從而提高裝配維修質量。

　　　本文力圖通過對有故障的汽車主減速器進行分析，拆裝檢測維修，消除故障，使 汽車的性能得到更佳的發揮，延長其使用壽命。

關鍵詞：主減速器，檢修，磨損，裝配，調整

Abstract:This paper introduces several cars Main reducer structure and use. The Main reducer can be said to Driven axle’s "heart", it will have direct affects the car's reliability, safety and service life. Due to the Main reducer of mechanical components in materials and manufacturing processes such as flaws or human damage caused by improper use of manipulation, making the car operational reliability become decrease. Automotive Driven axle Main reducer in the course of normal wear and abnormal wear and tear on the car are harmful. When the parts have not reached the wear limit, it can to maintenance, assembly and adjustment the Main reducer in time, to eliminate hidden dangers and prolong service life.

　　　As the car’s Driven axle have complicated structure and receive some broken strength. So the troubles are easy happening. And the Main reducer is one of the most vulnerable problem part in the driven axle. In this paper, the Main reducer driving and driven gears, bearings  and  bearing  supports  overhaul;  main,  driven  gear  meshing  print,  meshing clearance, assembly and bearing preload adjustment degree summarize; Making a good Technological process of vehicle maintenance, in order to enable the Main reducer have a right way to assembly, thereby enhancing the assembly of repair quality.

　　　This paper tries to analyses the car Main reducer fault, disassembling test and maintenance, eliminate malfunction, make the car’s performance get better play, prolong the service life.

Keywords: Main reducer, Maintenance, Wear, Assembly, Adjustment