Tham khảo tài liệu 'sổ tay tiêu chuẩn thiết kế máy p40', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | _CHAPTER 34__ BEVEL AND HYPOID GEARS Theodore J. Krenzer . Director of Research and Development Gleason Machine Division Rochester New York Robert G. Hotchkiss . Director Gear Technology Gleason Machine Division Rochester New York INTRODUCTION TERMINOLOGY GEAR MANUFACTURING I GEAR DESIGN CONSIDERATIONS I GEAR-TOOTH DIMENSIONS GEAR STRENGTH DESIGN OF MOUNTINGS COMPUTER-AIDED DESIGN 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. TERMINOLOGY 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. . 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. . 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. . STANDARD HANDBOOK OF MACHINE DESIGN FIGURE Straight-bevel set. Gleason Machine Division. FIGURE 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. . Tooth Geometry The nomenclature used in this chapter .
