Connection transmission device for hub and main shaft

The embodiment of the utility model discloses a hub and main shaft connection transmission device which comprises a hub casting and a main shaft, the hub casting is provided with a combination cylindrical surface, the main shaft is provided with a combination plane, and the combination cylindrical surface is in butt joint with the combination plane to enable the combination cylindrical surface and the combination plane to be connected. The hub casting coincides with the central axis of the main shaft; and the combination cylindrical surface is connected with the combination plane through a connecting assembly. The wind wheel torque is transmitted through the torque loose piece, the risk that a bolt is sheared and fractured due to slippage of a hub and a main shaft is avoided, torque is transmitted no longer depending on static friction force of a large-range joint surface of the main shaft, the flatness of the joint surface of a casting and the main shaft is reduced, the roughness is reduced, and the machinin