The patented integral drive train incorporates the rotor shaft and gearbox as a single unit. This gives the advantage of lower weight and better flow of forces. The gearbox is a three stage gear with two planetary reduction stages and one parallel shaft gear stage.
The helical-tooth planetary stages and the helical-tooth parallel-shaft stage are optimized with shape and tooth trace compensation. To compensate for internal loads, the planetary stage sun wheels are self adjusting. The gear box has forced lubrication system.
The gear oil temperature is monitored by a sensor and automatically cooled by a separate oil-air cooler and a filter unit in the nacelle if the permissible oil temperature is exceeded.
Labyrinth seals ensure a perfect seal and are wear-resistant.