The reasons why copper gears are not wear-resistant are as follows:

1, the hardness and strength of copper are not comparable to that of steel, so the copper gear is not wear-resistant;

2. The gear is a stressed part, and the two gears mesh and rotate, which is seriously worn when used;

3. In actual use, the copper gear runs in with the steel gear, which leads to serious wear of the copper gear, so the copper gear is not wear-resistant.