本文件规定了用于确定具有渐开线外齿或内齿的圆柱齿轮表面承载能力的基本公式。它包括对表面耐久性的所有影响的公式，可以对其进行定量评估。它主要适用于石油？润滑变速器，但也可用于获得（慢？运行）润滑脂？润滑变速器，只要啮合中始终存在足够的润滑剂。 给定的公式适用于齿形符合ISO 53中标准化的基本齿条的圆柱齿轮。它们也可用于与实际横向接触比小于ε α n=2,5的其它基本齿条共轭的齿。结果与其它方法吻合较好（见文献[5]、[7]、[10]、[12]）。除第4条所述外，这些公式不能直接应用于评估齿轮齿面损伤类型，如塑性屈服、划伤、擦伤等。 通过允许接触应力确定的负载能力被称为“表面负载能力”或“表面耐久性”。 如果此范围不适用，请参考ISO 6336-1:20 19第4条。

This document specifies the fundamental formulae for use in the determination of the surface load capacity of cylindrical gears with involute external or internal teeth. It includes formulae for all influences on surface durability for which quantitative assessments can be made. It applies primarily to oil？lubricated transmissions, but can also be used to obtain approximate values for (slow？running) grease？lubricated transmissions, as long as sufficient lubricant is present in the mesh at all times. The given formulae are valid for cylindrical gears with tooth profiles in accordance with the basic rack standardized in ISO 53. They can also be used for teeth conjugate to other basic racks where the actual transverse contact ratio is less than ε_αn = 2,5. The results are in good agreement with other methods (see References [5], [7], [10], [12]). These formulae cannot be directly applied for the assessment of types of gear tooth surface damage such as plastic yielding, scratching, scuffing and so on, other than that described in Clause 4. The load capacity determined by way of the permissible contact stress is called the "surface load capacity" or "surface durability". If this scope does not apply, refer to ISO 6336-1:2019, Clause 4.