- 66 - eBike, eBike L, eBike EL 2018112-003 Rev J
E: Drive Unit
The drive unit is located in a rugged, die-cast aluminum housing. The drive and free-wheel shafts are
made of hardened and ground steel. They are located in deep groove ball bearings both ends of which
are covered. Within the drive unit the distance between axes has been chosen so as to make adjustments
superfluous.
Guard rings secure the drive shaft in the bearing receptacles. On both sides the bearings are secured
with a Loctite bond. The sprocket is secured with guard rings on the drive shaft.
On both sides the free-wheel shaft is located in deep groove ball bearings and guard rings secure the
seating of the shaft. The bearings are additionally secured with a Loctite bond. On the free-wheel axle
the disk for the toothed belt and the sprocket are secured with guard rings. The generator disk for RPM
measurement is screwed to the protruding end of the free-wheel shaft.
The eddy-current brake is inserted into the die-cast housing from above. On the right and left, it is
secured with hexagon nuts. When the shaft of the eddy-current brake presses against the base of the
bearings, the tension of the toothed belt is correct. After insertion of the eddy-current brake its center
run is adjusted by a slight tilt. The slots accepting the traction rope must be in a vertical position. The
bearing is secured with a hexagon counter nut. A ring wrench is required for this purpose.
The toothed belt is an endless belt. It is installed together with the free-wheel shaft.
The chain is linked with a chain lock. Once the lock has been opened, the chain can be removed.
Replacement:
For servicing, the entire drive unit can be replaced.
* Drive unit with straing gauge and PCB RPM, assembled.
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