標準號：ISO 21771-2007
中文標準名稱：齒輪.圓柱漸開線齒輪和齒輪副.概念和幾何學
英文標準名稱：Gears - Cylindrical involute gears and gear pairs - Concepts and geometry
標準類型：J17
發布日期：2007/9/1 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：J17
國際標準分類號：21.200
引用標準：ISO 53-1998;ISO 1328-1-1995;ISO 1328-2-1997
適用范圍：This International Standard specifies the geometric concepts and parameters for cylindrical gears with involutehelicoid tooth flanks. Flank modifications are included.It also covers the concepts and parameters for cylindrical gear pairs with parallel axes and a constant gear ratio, which consist of cylindrical gears according to it. Gear and mating gear in these gear pairs have the same basic rack tooth profile.The equations given are not restricted to the pressure angle, 20 . P α = °The standard is structured as follows.- Listing of symbols and nomenclature for a unique description of gears and gear pairs (see Clause 3).- Equations and explanations of the relevant values for defining a cylindrical gear and its tooth system. The equations for determination of the nominal values for zero-deviation gear description parameters are stated for radial tooth dimensions (gear tooth heights), the distance between flanks of the same hand, the distance between flanks of opposite hand, as well as the tooth flank characterizing parameters (see Clause 4).- Equations and explanations of the relevant values for defining cylindrical gear pairs. The equations for the essential parameters characterizing the engagement conditions of the unloaded gear pair are listed (see Clause 5).- Equations and suggestions for desired flank modifications (see Clause 6).- Concepts and recommendations needed for a unique geometrical definition of the intended results from manufacture (Clause 7).- Equations for determination of the nominal values or the limiting values for the most used inspection methods for tooth thickness (see Annex A).