Which is better, Tangshan Sanyou or Sumitomo Heavy Machinery?

Tangshan Sanyou and Sumitomo Heavy Machinery are better than Sumitomo Heavy Machinery. Sumitomo Heavy Machinery has tough mechanical properties and long service life. The inner gear adopts circular arc tooth profile, and the outer gear adopts circular arc hypocycloid parallel curve, so compared with involute gear, the meshing rate is increased by 2 ~ 3 times, and the teeth will not be broken, which makes the reducer tough and prolongs the service life. Tangshan Sanyou has poor flexibility, troublesome disassembly, slow driving speed and high fuel consumption. Therefore, Sanyou and Sumitomo in Tangshan are better at heavy machinery than Sumitomo.