![]() ![]() 3.2 Comparative size of various rack teeth * Extracted from JIS B 1701-2: 1999 Cylindrical Gears for general engineering and for heavy engineering - Part 2 : Modules.įigure 3.2 shows the comparative size of various rack teeth.įig. Table 3.2 Standard values of module Unit: mm It is recommended to use the values in the series I and not to use with Module 6.5, if possible. The data in table 3.2 is extracted from JIS B 1701-2: 1999 which defines the tooth profile and dimensions of involute spur gears and helical gears. The value isĬalculated from multiplying Module m by Pi(π).ĭefinition : The angle of a gear tooth leaning against a normal reference line.ĭefinition : The distance between reference line and tooth tip.ĭefinition : The distance between reference line and tooth root.ĭefinition : The distance between tooth tip and tooth root.ĭefinition : Depth of tooth meshed with the mating gear.ĭefinition : The distance (clearance) between tooth root and the tooth tip of mating gear.ĭefinition : The radius of curvature between tooth surface and the tooth root. The value is calculated from dividing theĭefinition : Reference Pitch is the distance between corresponding points on adjacent teeth. ![]() Table.3.1 Symbols related to Gear Tooth Profileĭefinition : Module is the unit size indicated in millimeter (mm). Reference tooth profile of a standard rackįig. Reference tooth profile of a rack standardized for the mating gearĢ. This type of full depth tooth is most common, but other types with shorter or longer tooth depths are also used in some applications. Although the pressure angle is usually set to 20 degrees, can be 14.5 or 17.5 degrees in specific applications.ġ. ![]() The tooth profile shown in Fig 3.1, where the tooth depth is 2.25 times the module, is called a full depth tooth. Table 3.1 lists terms, symbols, formulas and definitions related to gear tooth profiles. 3.1 shows the tooth profile of a gear rack, which is the standard involute gear profile. Involute gears can be manufactured easily, and the gearing has a feature that enables smooth meshing despite the misalignment of center distance to some degree. ![]() For power transmission gears, the tooth form most commonly used today is the involute profile. ![]()
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