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Standard Handbook of Machine Design P40

CHAPTER 34 BEVEL AND HYPOID GEARS Theodore J. Krenzer, M.S. Director of Research and Development Gleason Machine Division Rochester, New York Robert G. Hotchkiss, B.S. Director, Gear Technology Gleason Machine Division Rochester, New York 34.1 34.2 34.3 34.4 34.5 34.6 34.7 34.8 INTRODUCTION / 34.1 TERMINOLOGY/34.1 GEAR MANUFACTURING / 34.7 GEAR DESIGN CONSIDERATIONS / 34.10 GEAR-TOOTH DIMENSIONS /34.19 GEAR STRENGTH / 34.25 DESIGN OF MOUNTINGS / 34.50 COMPUTER-AIDED DESIGN / 34.55 34.1 INTRODUCTION This chapter provides you with information necessary to design a bevel- or hypoidgear set. It includes guidelines for selecting the type and size of a gear set to suit the application requirements. Equations and. | _CHAPTER 34__ BEVEL AND HYPOID GEARS Theodore J. Krenzer M.S. Director of Research and Development Gleason Machine Division Rochester New York Robert G. Hotchkiss B.S. Director Gear Technology Gleason Machine Division Rochester New York 34.1 INTRODUCTION 34.1 34.2 TERMINOLOGY 34.1 34.3 GEAR MANUFACTURING I 34.7 34.4 GEAR DESIGN CONSIDERATIONS I 34.10 34.5 GEAR-TOOTH DIMENSIONS 34.19 34.6 GEAR STRENGTH 34.25 34.7 DESIGN OF MOUNTINGS 34.50 34.8 COMPUTER-AIDED DESIGN 34.55 34.1 INTRODUCTION This chapter provides you with information necessary to design a bevel- or hypoid-gear set. It includes guidelines for selecting the type and size of a gear set to suit the application requirements. Equations and graphs are provided for calculating geartooth geometry strength surface durability and bearing loads. Although the text provides sufficient data to design a gear set reference is also made to appropriate American Gear Manufacturer s Association AGMA publications and software available for computer-aided design. 34.2 TERMINOLOGY 34.2.1 Types of Bevel and Hypoid Gears Straight-bevel gears are the simplest form of bevel gears. The teeth are straight and tapered and if extended inward they would pass through the point of intersection of the axes. See Fig. 34.1. Spiral-bevel gears have teeth that are curved and oblique to their axes. The contact begins at one end of the tooth and progresses to the other. See Fig. 34.2. Zerol bevel gears have teeth that are in the same general direction as straightbevel gears and are curved similarly to spiral-bevel gears. See Fig. 34.3. 34.1 34.2 STANDARD HANDBOOK OF MACHINE DESIGN FIGURE 34.1 Straight-bevel set. Gleason Machine Division. FIGURE 34.2 Spiral-bevel set. Gleason Machine Division. Hypoid gears are similar in appearance to spiral-bevel gears. They differ from spiral-bevel gears in that the axis of the pinion is offset from the axis of the gear. See Fig. 34.4. 34.2.2 Tooth Geometry The nomenclature used in this chapter .