Abstract
Load carrying capacity of the crossed helical gears is considered to be low since the theoretical meshing is of a point contact. However, there is a possibility that a comparatively strong power can be transmitted because the contact area is widened by the elastic deformation and wear of gear tooth. In this study, the load carrying characteristics of the plastic (polyacetal co-polymer) crossed helical gears were investigated. The endurance experiment for the plastic crossed helical gears of helix angle of 20 degrees were performed with the angle between shafts of 40 degrees and a rotation speed of 500rpm (about lm/s in tangential speed). The meshing tooth and the atmosphere temperatures were measured during operation and the fatigue life of gear tooth was determined. As a result, the relation between the life of gears and the temperature of meshing tooth was clarified. And the relation between the temperature rise of meshing tooth from atmosphere temperature and the loading torque was clarified.
