Study on load carrying characteristics of crossed helical gears (special focus on scuffing strength, wear and friction loss)

摘要

Crossed helical gears fail mainly by scuffing. Power transmission is low, because the Hertzian pressure in the small elliptic contact area is very high, and the sliding velocity between two contacting tooth surfaces is very high compared with other kind of gears. However, crossed helical gears have important advantages, since they are easy to produce and their engagement is not influenced by mounting errors in center distance or shaft angle. This study presents some new ways of improving the load carrying capacity of crossed helical gears. The influence of lubricating oil, tooth surface treatment and tooth form on the limiting load for scuffing was studied experimentally. The results were summarized and formulas were established in view of practical design.