Research of Force-Fitted Gear : 5th Report, On the Distribution of Stress along the Fillet Curve of Gears having Bosses on their Sides and Large Size Gear

Abstract

Previous studies of authors on the force-fitted gear have been done for gears having no bosses on their sides and comparatively small size gears.But the force-fitted gears mestly used in various types of macines have bosses on their sides and are of large size.In this paper, the stress caused by force-fitting at the root fillet of gear teeth having bosses on their sides and of large size gears was chosen as the subject of the present study.Moreover bending fatigue strength and stress at the root fillet of these test gears are examined.The following results are obtained.(1) Bending fatigue strength of gears having bosses on their sides is lower than that of gears having no bosses on their sides, and the differences between them are mostly caused by stress concentration at corner of step in gear rim.(2) Calculated results by theoretical and practical formulas introduced for small size gears agree fairly well with the experimental ones of large size gears.