Tianbao Intelligent Transmission Unveils Innovative Wind Power Main Shaft System, Driving Industry Change with a “Rigid-Outside, Flexible-Inside” Sliding Design

     At present, most mainstream wind turbines adopt either rigid-outside rigid-inside front-integrated rolling bearing shaft systems, or flexible-outside rigid-inside front-integrated rolling bearing solutions. The sliding main shaft system launched by Tianbao Intelligent Transmission achieves a major optimization and breakthrough in technical approach. While bearing the same complex loads from wind turbine rotors, it offers a new solution path for next-generation wind power drivetrain systems.

    One of the core strengths of the sliding main shaft system lies in the clear separation of load paths. The power load acting on the rotor, namely torque, is transmitted directly and efficiently to the gearbox through the sliding main shaft, allowing the gearbox to focus solely on its core transmission function. At the same time, non-power loads such as bending moments, axial forces, and radial forces are guided directly to the bearing housing and tower structure. This clear division of responsibilities not only improves transmission efficiency, but also effectively reduces the load borne by the gearbox, helping to extend its service life.

      To address the unavoidable dynamic impact loads encountered during wind farm operation, Tianbao’s “rigid-outside, flexible-inside” design demonstrates the ingenuity of its internal flexibility. The sliding main shaft system innovatively integrates an elastic coupling at the rear end. When the rotor is subjected to gust-induced impacts, the impact energy is first absorbed and buffered by this built-in elastic element, and then transmitted smoothly to the gearbox. This design significantly smooths torque fluctuations along the drivetrain, reduces the risk of impact fracture and fatigue damage to critical components, and enhances the overall operational stability and reliability of the turbine.