锥齿轮承载能力计算 第3部分：齿根强度计算

[中文适用范围]： 本文件规定了用于计算直齿、斜齿（斜齿）、Zerol 和螺旋锥齿轮（包括准双曲面齿轮）齿根应力的基本公式，齿根下最小轮缘厚度为 3.5 mmn。所有载荷对齿根应力的影响都包括在内，只要它们是齿轮传递载荷的结果，并且能够定量评估。在计算齿根应力 σF 或允许齿根应力 σFP 时，应考虑诸如齿轮轮缘收缩配合引起的应力，这些应力会叠加在齿载荷产生的应力上。本文件不适用于齿面断裂的评估。本文件中的公式基于虚拟圆柱齿轮，并仅限于虚拟圆柱齿轮横向接触比为 εvα < 2 的锥齿轮。结果在 ISO 10300-1 规定的应用系数范围内有效。弯曲强度公式适用于齿圆角处的断裂，但不适用于工作齿侧表面上的断裂，也不适用于齿圈或齿轮毛坯通过腹板和轮毂的失效。本文件不适用于超过 103 次循环允许值的应力水平，因为该范围内的应力可能超过齿轮齿的弹性极限。注：本文件不适用于在负载下接触斑块不充分的锥齿轮。用户应注意，当公式用于大平均螺旋角 (βm1 + βm2)/2 > 45°、有效压力角 αe > 30° 和/或大齿宽 b > 13 mmn 时，本文件的计算结果应由经验证实。 [外文原描述]： This document specifies the fundamental formulae for use in the tooth root stress calculation of straight and helical (skew), Zerol and spiral bevel gears including hypoid gears, with a minimum rim thickness under the root of 3,5 m mn . All load influences on tooth root stress are included, insofar as they are the result of load transmitted by the gearing and able to be evaluated quantitatively. Stresses, such as those caused by the shrink fitting of gear rims, which are superposed on stresses due to tooth loading, are intended to be considered in the calculation of the tooth root stress, σ F , or the permissible tooth root stress σ FP . This document is not applicable in the assessment of tooth flank fracture. The formulae in this document are based on virtual cylindrical gears and restricted to bevel gears whose virtual cylindrical gears have transverse contact ratios of ε vα < 2. The results are valid within the range of the applied factors as specified in ISO 10300-1. The bending strength formulae are applicable to fractures at the tooth fillet, but not to those on the active flank surfaces, to failures of the gear rim or of the gear blank through the web and hub. This document does not apply to stress levels above those permitted for 10 3 cycles, as stresses in that range can exceed the elastic limit of the gear tooth. NOTE This document is not applicable to bevel gears which have an inadequate contact pattern under load. The user is cautioned that when the formulae are used for large average mean spiral angles ( β m1 + β m2 )/2 > 45°, for effective pressure angles α e > 30° and/or for large facewidths b > 13 m mn , the calculated results of this document should be confirmed by experience.