KTM is already working on a touring “GT” version of the 1290 Super Duke and a new patent application from the company suggests it could get the option of a semi-automatic transmission.
The patent application specifically relates to a gearbox lock, which prevents the transmission from rotating and essentially functions as a parking brake. However, the document specifies that it is intended for use on a motorcycle with a semi-automatic transmission.
Specifically, the document states that the lock is intended for use on a motorcycle equipped with a centrifugal clutch, the type of clutch usually fitted to a scooter, which automatically decouples the engine from the transmission at low revs. It also says that while the six gears inside the box are conventional, they are intended to be engaged using an electric "shift motor."
The idea of combining a conventional transmission with a centrifugal clutch is not new, and MV Agusta already offers motorcycles using the Rekluse centrifugal clutch which, combined with a quickshift gear lever, means that it is not all necessary to use the clutch lever to change gear. KTM appears to be working on a similar idea but with the addition of electronic shifting, whether by foot action or push button, to allow seamless integration of shifting and engine management and allow smoothest gear changes possible.
The locking system shown in the patent is necessary because, with a centrifugal clutch that naturally disengages when the engine is stopped, there is no way to leave a motorcycle parked with a gear engaged.
KTM added a simple ratchet to the mechanism that engages a claw in the teeth of one of the input shaft gears, locking the transmission. The pawl slides into place when a "park" position is selected on the shift drum.
The patent explains: “Control commands from a motorcyclist can be received by the electronic control unit so that the motorcyclist can switch between different rotation positions of the shift cylinder, in particular between at least one rotation position within the range of freewheel, and a rotation position within the locking range, and/or between rotation positions within the freewheel range. This allows a rider to operate the automatic transmission and shift lever lock. The shift lock can therefore be operated via existing components if there is an automatic gearbox on the motorcycle, and no additional components are required. »
How do I know that the semi-automatic transmission is intended for the firm's “1290” model range using the 1301cc version of the LC8 V-twin? Because the drawings are so detailed that even some part numbers are visible, including on the input shaft and 1st gear sprocket. Cross-checking these figures with KTM's parts database confirms that these are components used on the 1290 Super Duke R, 1290 Adventure and Brabus 1300 R models, all of which share the same 1301 cc engine.
With up to 180 hp, a motorcycle equipped with a semi-automatic gearbox using the big LC8 V-twin would surely be the most powerful production model to use a centrifugal clutch and a semi-automatic transmission.
The images also show the shift motor (numbered "27") which turns the shift drum, allowing push-button control, although the document states that a conventional foot shift could be used instead.
