| 摘要 |
<p>The present invention relates to a gear shift system comprising a shift lever, a gearbox, a servo mechanism, a medium for transferring shift commands from the shift lever to the servo mechanism, wherein a shift command is transferred by the medium to a gearbox shaft (1), the servo mechanism is controlled by a servo valve (2), and the servo valve (2) is controlled by a control mechanism arranged in communication with the medium for transferring shift commands such that movement from said medium is transferred to said control system. According to the invention the control mechanism is arranged to decouple the servo valve (2) and the medium for transferring shift commands when the applied force on the shift lever exceeds a threshold value. The assisting servo force from the servo mechanism is by this switched off in the case of an exceedingly high manual force applied to the shift lever in order to provide high protection for the gearbox against damage.</p> |
