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<正>Crossed helical gears can transmit motion and power between two skewed axes.Moreover,slight changes in shaft angle and center distance do not affect the conjugate action of crossed helical gears,the application was restricted because the load carrying capacity was comparatively low for surface failures.Although the meshing of teeth of crossed helical gears theoretically takes place at a point,this contact point extends over a small ellipse due to elastic deformation under loading. Hence,the contact stress between the tooth surfaces is comparatively high. Furthermore,the sliding velocity on the tooth surfaces is higher than for another kinds of gearing.For these two reasons,crossed helical gears could carry only very small loads.To make the most of these advantages,it is important to improve the load carrying capacity.To guard against the danger of surface failures,that is necessary to have a means of calculating the contact stress states.The objective of this paper is to present a geometrical method that is able to improve the load carrying capacity for these surface failures of crossed helical gears.