Design of Angular Hypoid Gear : 2nd Report, Gear Cutting and Design Dimensions

In general, the shaft angle of automotive hypoid gears is 90 degrees. Therefore, the design method of an angular hypoid gear had not been investigated sufficiently up to now. Moreover, the tooth spiral of the hypoid gear is generally on the right hand and the pinion axis is offset below the gear axis. Therefore, when the pinion axis is offset conversely, the design method has not been investigated in detail. In the present report, by using basic equations on the angular hypoid gear with an opposite offset obtained in the previous paper, the design dimensions of the angular hypoid gear whose shaft angle is in the region of 70～100-degrees are shown. As a result, it was found that as the shaft angle increases the pitch angle of the gear increases, but that of the pinion does not so much change and the bias angle which shows the inclination of the tooth bearing changes negatively or positively the sign near the 90-degree shaft angle on the drive-side tooth surface