| 摘要 |
<p>A self-propelled agricultural machine has a driving engine (1) adapted to be coupled via a travel speed variator (2) and a clutch (4) to a non-synchromesh gear ratio change mechanism (6), the agricultural machine having a thrust wheel or dog-type shift mechanism with a switching device and an electrical control device (15) connected to rotary speed sensors on the shafts of the ratio change mechanism, and to a processor (13) which imparts an engaging clearance for a preselected ratio to the switching device. A control device for the clutch, variator and ratio change mechanism comprises a hand and/or foot lever (16) which is pivotable out of a transversely engaged midway position (O) through an unstable midway position (N) into a forwards positioning zone (V) and into a reverse positioning zone (R), being so connected through switching and auxiliary elements to the processor and to the device for controlling the clutch and gearbox that it is possible to derive from the position of the control lever in the reverse and forward zones a desired speed signal which operates the travel speed variator and in that pivoting of the control lever out of the midway position, a clutch engaging signal, and conversely upon pivoting of the control lever into the midway position a clutch disengaging signal, is generated. <IMAGE></p> |
