DOUBLE HELICAL GEAR AND METHOD OF WELDING DOUBLE HELICAL GEAR

摘要

A double helical gear includes a rotating shaft, a first gear, a second gear, a first weld zone, and a second weld zone. The first gear and the second gear are disposed side by side in an axial direction on the rotating shaft, the first gear includes a first teeth part, the second gear includes a second teeth part, and the first gear includes a first annular part to be fitted to the rotating shaft. The first weld zone is located on the first end surface, and has a welded part extending over a fitting portion between the first annular part and the rotating shaft as the first end surface is seen from the axial direction. The second weld zone is located on the second end surface of the first annular part at a gap between the first teeth part and the second teeth part in the axial direction.