车辆工程外文翻译-汽车主减速器

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1、中文2300字，1450英文单词，7500英文字符本科生毕业设计（论文） 外文翻译   毕业设计（论文）题目： 汽车主减速器的对比分析与设计   外文题目： AUTOMOTIWE FINAL DRIVE 译文题目： 汽车主减速器   学  生  姓  名：                              专        业：  

2、;车辆工程                       指导教师姓名：   金嘉琦                            评  阅  日  期：                     &nbs

3、p;            AUTOMOTIWE FINAL DRIVE FINAL DRIVE A final drive is that part of a power transmission system between the drive shaft and the differential. Its function  is  to  change  the  direction  of  the  power transmitted &nbs

4、p;by  the  drive  shaft  through  90  degrees  to  the driving  axles.  At  the  same  time.  it  provides  a  fixed reduction between the speed of the drive shaft and the axle driving the wheels. The  reductio

5、n  or  gear  ratio  of  the  final  drive  is determined by dividing the number of teeth on the ring gear  by  the  number  of  teeth  on  the  pinion  gear.  In passenger  vehicles,  this  speed

6、  reduction  varies  from about 3:1 to 5:1. In trucks it varies from about 5:1 to 11:1. To calculate rear axle ratio, count the number of teeth on each gear. Then divide the number of pinion teeth into the number of ring gear teeth. For example, if the pinion gear has 10 teeth and the

7、 ring gear has 30 (30 divided  by  10),  the  rear  axle  ratio  would  be  3:1. Manufacturers install a rear axle ratio that provides a compromise  between  performance  and  economy.  The average passenger car ratio is 3.50:1. T

8、he  higher  axle  ratio,  4.11:1  for  instance,  would increase  acceleration  and  pulling  power  but  would decrease fuel economy. The engine would have to run at a higher rpm to maintain an equal cruising speed.   The  

9、lower   axle   ratio.   3:1,   would   reduce acceleration and pulling power but would increase fuel mileage.  The  engine  would  run  at  a  lower  rpm  while maintaining the same speed.   The major components of the  

10、final  drive  include the  pinion  gear,  connected  to  the  drive  shaft,  and  a bevel gear or ring gear that is bolted or riveted to the differential  carrier.  To  maintain  accurate  and  proper alignment &nbs

11、p;and  tooth  contact,  the  ring  gear  and differential  assembly  are  mounted  in  bearings.  The bevel drive pinion is supported by two tapered roller bearings,   mounted   in   the   differential   carrier. &n

12、bsp; This pinion  shaft  is  straddle  mounted.  meaning  that  a bearing is located on each side of the pinion shaft teeth. Oil  seals  prevent  the  loss  of  lubricant  from  the  housing where the pinion shaft and ax

13、le shafts protrude. As a mechanic, you will encounter the final drive gears in the spiral bevel and hypoid design. Spiral Bevel Gear  Spiral bevel gears have curved gear teeth with the pinion and ring gear on the same center line. This type of  final  drive  is  used  e

14、xtensively  in  truck  and occasionally in older automobiles. This design allows for constant contact between the ring gear and pinion. It also necessitates the use of heavy grade lubricants.  Hypoid Gear  The hypoid gear final drive is an improvement or variation of the spi

15、ral bevel design and is commonly used in light and medium trucks and all domestic rear- wheel drive automobiles. Hypoid gears have replaced spiral bevel gears because they lower the hump in the  floor  of  the  vehicle  and  improve  gear-meshing  action. As you can see in figure 5-13, the pinion meshes with the ring gear below the center line and is at a slight angle (less than 90 degrees).