Characteristics of hard tooth surface reducer. 
The main results are as follows: 1. The priority number of priority number system is adopted in center distance, center height and transmission ratio. 

2. The gear parameters and structure are optimized by computer. 

3. The gear is ground by Carburizing and quenching of high-quality high-strength low-carbon alloy steel. The hardness of the tooth surface is high, and the accuracy of the gear is up to grade 6 of the international standard. 

4. The transmission efficiency is high, the noise is low, and the bearing capacity reaches the advanced level of the world in the 1990s.