Studies on Effects of Tip Relief upon Load Carrying Characteristics of Spur Gears : Mainly on Limiting Load for Scoring and Friction Loss

Abstract

The effects of tip relief on the load carrying characteristics of spur gears were studied by means of FZG-Spur gear testing machine. Two kinds of tooth profiles were used for our studies. One was a nearly standard gear with almost no profile shifting, the other was a gear with a large profile shifting. In the case of the standard gear or the gear with profile of a small profile shifting, the load carrying characteristics were very good, if the tip relief was applied to both the driver gear and the follower gear, but it was unfavorable for the load carrying characteristics, if the tip relief was applied only to the driver gear. Furthermore the influences of tip relief in the case of profile shifted gears upon the load carrying characteristics were studied. The results with profile shifted gears were different from the results with standard gears.