Mehrgang-Schaltgetriebe

摘要

A drive transmission for powered vehicles and the like has change speed gears which may be shifted to provide a selected one of a plurality of drive ratios and has clutches at both the input and output ends whereby the gears may be decoupled from both the driving engine and driven shaft and may then be braked to a stop to facilitate shifting. Brakes are provided at both the input and output ends of the gearing section and a pneumatic control system responds to movement of the operator's shift lever by operating the clutches and brakes in a programmed sequence which assures smooth shifting and avoids damage. Upon movement of the operator's shift lever to a selected setting, the control system simultaneously disengages both clutches and applies both brakes. The control system then energizes fluid operated means for making the appropriate gear interconnections and then sequentially releases the input brake and the output brake. The input clutch is then engaged and finally the output clutch is engaged to reestablish a driving connection between the engine and driven elements. The delay between release of the input and output brakes assures that abutted teeth in the gearing section engage easily at low relative speeds and under only light loading.