As shown in the cloud diagram and partial enlarged diagram of the contact stress distribution of the concave spur gear, the maximum contact stress of the concave spur gear in the figure is distributed at the top of the big gear and the root of the pinion, and the maximum contact stress is 1942mpa, while the maximum contact stress of the smooth spur gear is 3119mpa. The maximum contact stress of the concave spur gear is obviously less than that of the smooth shape. The contact stress between the contact surface of the big gear and the small gear is distributed between 1295-1762mpa.
