AUTOMATISCHES GETRIEBE FÜR FAHRZEUGE.

摘要

An automatic transmission for a vehicle which automatically carries out transmission control in relation to the running of the vehicle. In addition to an operation lever (111, 112) such as a select lever, a hold switch (180) is provided for informing an automatic transmission controller (130) of the need for a hold operation to automatically hold the currently selected gear position (speed step) of the transmission (160). The hold operation is executed by the controller depending upon the operation of the hold switch. When the forward-reverse switching is effected after the hold switch is operated, furthermore, the transmission at the time of start is once switched (shifted) to the second speed step forcibly. As the desired speed step that is held is reached accompanying the rise of the vehicle speed, this speed step is automatically held as a result of the hold operation. Therefore, even vehicles for construction machinery such as wheel loaders are permitted to execute the operation efficiently and smoothly.