開拖拉機或卡車都需要double clutch來換擋．

因為它們都是用的unsynchronized transmission

The purpose of the double-clutch technique is to match the rotational speed of the input shaft being driven by the engine to the rotational speed of the gear you wish to select (directly connected to rotating wheels). Once the speeds are matched, the gear will engage smoothly. If the speeds are not matched, the dog teeth on the collar will "crash" or grate as they attempt to fit into the holes on the desired gear. A modern synchromesh gearbox accomplishes this synchronization automatically.

所有跟帖： 

• 謝謝老無，我貼個全的吧，萬一有人感興趣： -moab- ♂ (2847 bytes) () 05/11/2007 postreply 14:49:16