附录1重型汽车驱动桥的基本结构及发展趋势1．重型汽车驱动桥的基本结构驱动桥是重型汽车的重要标志之一，其基本结构有以下两种1．1中央单级减速驱动桥是驱动桥结构中最为简单的一种，是驱动桥的基本形式，在载重汽车中占主导地位。
一般在主传动比小于6的情况下，应尽量采用中央单级减速驱动桥。
目前的中央单级减速器趋于采用双曲线螺旋伞齿轮。
主动小齿轮采用骑马式支承，有差速锁装置供选用。
1．2中央双级驱动桥在国内目前的市场上，中央双级驱动桥主要有2种类型：一类如伊顿系列产品，事先就在单级减速器中预留好空间，当要求增大牵引力与速比时，可装人圆柱行星齿轮减速机构，将原中央单级改成中央双级驱动桥。
这种改制“三化”程度高，桥壳、主减速器等均可通用，盆齿轮直径不变；另一类如洛克威尔系列产品，当要增大牵引力与速比时，需要改制第一级伞齿轮后，再装入第二级圆柱直齿轮或斜齿轮，变成要求的中央双级驱动桥这时桥壳可通用，主减速器不通用，盆齿轮有2个规格。
2009年中国汽车的产销量突破1000万辆，以惊人的速度迈进千万辆级的汽车生产、消费大国行列。
除了整车制造以外，汽车零部件领域的快速发展也有目共睹。
《2011中国汽车驱动桥市场趋势观察研究预测报告》分析：零部件行业销售和盈利环比继续改善，2009年9~11月税前利润环比增长248%。
2009年9-11月份，汽车零部件行业销售收入达3,413亿元，同比上升499%，环比增长80%，销售收入自2季度反弹以来持续攀升，国内汽车销量增长推动零部件配套收入上升是行业增长的主要来源。
行业利润总额达289亿元，同比上升1303%，环比增长248%,在行业销售收入增长背景下，行业盈利也实现同比大幅上升。
)工程自卸车、运水车等(的双级主减速器。
后者更适宜于最大程度地满足用户不同需要。
而亚洲、非洲和南美国家则采用带轮边减速的双级主减速器的驱动桥，用于非道路和恶劣道路使用的车辆)行星齿轮传动(带轮边减速;《2011中国汽车驱动桥市场趋势观察研究预测报告》中数据表明：现在，世界上货车普遍采用两种驱动桥结构单级减速双曲线螺旋锥齿轮副本报告着重分析了2009-2010年中国汽车驱动桥行业和市场发展现状，行业发展趋势。
依据对大量最新资讯的详尽分析，结合权威的观点，并将近年来大量的连续监测数据运用数据模型分析，对2011-2015年中国汽车驱动桥市场的发展做出科学的预测。
《2011中国汽车驱动桥市场趋势观察研究预测报告》2010年6月版由郑林博士领衔撰写。
在撰写过程中得到香港中华商业信息研究院的智慧支持。
并得到国家统计局，中国汽车工业协会，中国汽车用品网，汽车零部件工业协会，中国海关，中国数字图书馆等多家信息机构的智慧支持。
在此表示感谢！附录2Heavy vehicle drive axle of the basic structure and development trend.1. The basic structure of heavy vehicles driving axleHeavy duty truck driving axle is one of the important marks, its basic structure has the following 3 kinds1.1 central single stage slowdown driven axleIs driving axle structure most simple one kind, is the basic forms, in driving axle load truck dominant. Generally in the main transmission ratio less than 6 cases, should try to use a central single stage slowdown driven axle. The current central single stage reducer tend to adopt hyperbola spiral bevel gears. Active pinion by riding type bearing, discriminating speed lock device for selection.1.2 central doublestage axlesIn domestic currently on the market, the central doublestage axles basically has two kinds: one profenofos Eaton series products, in advance in single stage reserved good space of speed reducer, when asked to increase traction and speed, can install people cylindrical planet gear institutions, will original central single stage into a central doublestage axles. This restructuring "three" degree high, bridge housing, main reducer, etc. Can be general, basins gear diameter unchanged, Another profenofos LuoKeWeiEr series product, when will increase traction and ratio, require restructuring first-level bevel gear, then loaded the second cylindrical spur gear or helical gears, become requirements of central doublestage axles then bridge housing, the main purpose of gear reducer not gm, basin has 2 specifications.2009 China automobile single-brand sales volume of 10 million cars, with amazing speed towards million units level car production, consumption power ranks. In addition to the vehicle manufacturing, automotive field outside the rapid development also evident. The 2011 China automobile driving axle market trend observation research forecast report analysis: spare parts industry sales and earningsannulus continues to improve, 2009 September to November 248% pre-tax profit growth period. 2009 9 - November, auto parts industry sales revenue of 3,413 billion yuan, rise compared to the 499%, annulus increased by 80 percent, and sales income from 2 quarterly rebound since continue to rise, domestic car sales growth parts matching income rise is the main source of industry growth. Industry profit total 289 billion yuan, up 1303%, rise in the industry 248% annulus growth increased sales background, industry profits also realization year-on-year increase dramatically.The 2011 China automobile driving axle market trend observation research forecast in the report on data indicate that: now, widely used in the world two axles van structure single stage deceleration hyperbola spiral bevel ) planetary gear transmission of ( belt wheel edges vice ;gear deceleration doublestage main reducer. The latter is more suitable for maximum satisfy user needs. Asia, Africa and South America countries will adopt belt wheel edges slowdown doublestage Lord gear reducer is driven axle, used for non-road and bad .) engineering dump truck, YunShuiChe etc (road vehicle in useThis report focuses on analyzing the 2009-2010 China automobile driving axle industry and market development present situation, the industry trend. Based on detailed analysis of the latest information, combined with the authoritative opinion, and nearly years large amounts of continuous monitoring data by using the data model analysis, to 2011-2015 China automobile driving axle market development to make scientific forecast.The 2011 China automobile driving axle market trend observation research forecast report June 2010 ZhengLin led by dr written version. In the writing process of getting Hong Kong Chinese commercial information institute wisdom support. And get the national bureau of statistics, China's automotive industry association, China auto supplies nets, auto parts industry association, China customs, China digital library of information institutions and companies wisdom support. In this thank!。