抄録
The meshing of teeth of crossed helical gears theoretically takes place at a point. The contact point extends over a small ellipse due to elastic deformation under power transmitting. Hence the contact stress between the tooth surface is comparatively high. Furthermore, the sliding velocity on the tooth surfaces is higher than for other kinds of gears. For these reasons, this meshing are able to carry only very small loading. Tb guard against the danger of surface failures, it is necessary to have a means of calculating the contact stress states. The details of variations of the contact ellipse on an imaginary rack of crossed helical gears were observed.
