The engineers from Eisenbeiss tackled these challenges by implementing a double helical pinion gear with an initial gear stage, also double helical. This initial stage is not separate, but meshes directly with the upper pinion gear teeth. That made it possible to eliminate 40% of the parts otherwise required, as only a further double helical pinion shaft was needed. Thus great cost savings were achieved not just in the area of investment but also regular maintenance and spare parts inventory.
The three shafts were each made from a single open-die forging to avoid shaft-hub connections susceptible to notch stress. Both sides of the housing with their bearing seats were implemented as thick full-surface slabs, making the housing very rigid overall.