英语翻译摘要：自动变速器是通过各种液压多片离合器和制动闸限制或接通行星齿轮组中的某些齿轮得到不同的传动比的.随着电子技术

Abstract:The automatic transmission is through a variety of hydraulic multi-plate clutch and brake to limit or group of planetary gear connected to some of the different gears of the transmission ratio.As electronic technology and the rapid development of computers,modern cars fitted with electronically controlled automatic transmission has become increasingly popular.According to statistics,in the United States on 90's new models,as the automatic transmission standard loading rate of more than 90%,Japan 73%,Europe 25%.Car with automatic transmission control is simple,ride comfort,power and economy better and so on.Thus,the correct use and maintenance of automatic transmission it is more important Key words:Planetary gear mechanism; Hydraulic Torque device; automatic transmission; clutch; brake; stall control switch; gear speed change mechanism