Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : February 28, 2017 - March 03, 2017
This paper presents a meshing analysis of face gears with a low gear ratio. A tooth contact analysis (TCA) method for face gears was developed that takes into account contact line changes associated with meshing, tooth accuracy and assembly misalignment. The results of a study of the motion curve pattern showed that the contact line length is shorter on the toe side and becomes longer toward the heel side and that the motion curve is likely to jump because of the influence of tooth accuracy and assembly misalignment. The results also showed that an appropriate pinion lead angle modification is effective in controlling motion curve jumping.
The results of fatigue durability tests are also presented. It was observed that the pinion gear broke not at the tooth root but at the tip near the border between single and double contact regions. A loaded tooth contact analysis (LTCA) method was developed to find the cause. It was found that the contact line where the single contact region begins is short and the distributed load on it is very large. It was verified that modifying the blank shape of a face gear so as to reduce the abrupt change in the total contact line length is effective in improving fatigue strength.
