Equi-Depth Tooth Hypoid Gear Using Formate Gear Cutting Method : 2nd Report, Cutting Conditions and Tooth Bearing Pattern

In general, a hypoid gear and a spiral bevel gear for cars are made up of a formate gear and a generated pinion. The tooth shape is tapered tooth. Much practice is required to obtain excellent tooth bearing of the tapered tooth. If we convert a tapered tooth to an equi-depth tooth, it is thought that we could easily obtain practical tooth bearing. To date, however, there is no paper that theoretically analyzes tooth bearing of the equi-depth tooth and actually demonstrates it. Therefore the tapered tooth is still used in cars. Thus, we have studied the gear cutting method of the equi-depth tooth hypoid gear. The tooth surface of the hypoid pinion is generated by the 3rd gear member. In such a case, it is useful to apply the cutting pitch cone instead of the pitch cone and to change the generating shaft angle to the tooth bearing development of a hypoid gear. In this report, we present the relationships between the cutting pitch angle or the generating shaft angle and the tooth bearing pattern compared with a tapered tooth