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本帖最后由 frank57 于 2013-12-31 12:19 编辑
z3126535 发表于 2013-12-31 11:38 
能简单说一下wet和dry的双离合最大区别么
wiki的解释
There are two fundamental types of clutches used in dual-clutch transmissions: either two wet multi-plate clutches which are bathed in oil (for cooling), or two dry single-plate clutches. The wet clutch design is generally used for higher torque engines which can generate 350 N·m and more, whereas the dry clutch design is generally suitable for smaller vehicles with lower torque outputs up to 250 N·m However, while the dry clutch variants may be limited in torque compared to their wet clutch counterparts, the dry clutch variants offer an increase in fuel efficiency, due to the lack of pumping losses of the transmission fluid in the clutch housing.
简而言之,wet clutch浸在oil里面防止过热,能承受更高的扭矩,但是传动效率低一点;dry clutch没有oil冷却,能承受的扭矩低很多,但是传动效率高。
这就是为什么ford要在汽油版的focus上用dry clutch(扭矩需求不高,才200N·m,但是更省油,利于销售宣传),在柴油版本上用wet clutch(扭矩高很多:340N·m,省油的需求却不强烈,因为柴油本身已经很省油了)
vw也采用类似的策略:golf这类小车用dry clutch,大车和柴油车上用wet clutch。
dry clutch在正常的使用环境下理论上应该没有问题,但是实际使用中,尤其是城市里频繁的clutch engage,导致过热,问题就是这么产生的。 |
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