ISO 10300-3:2014
Calculation of load capacity of bevel gears - Part 3: Calculation of tooth root strength

Standard No.

ISO 10300-3:2014

Release Date

2014

Published By

International Organization for Standardization (ISO)

Status

Be replaced 2023-08

Replace By

ISO 10300-3:2023

Latest

ISO 10300-3:2023

Scope

This part of ISO 10300 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 mmn. 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, σF, or the permissible tooth root stress σFP. This part of ISO 10300 is not applicable in the assessment of the so-called flank breakage, a tooth internal fatigue fracture (TIFF). The formulae in this part of ISO 10300 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 (see also ISO 6336-3[1]). Additionally, the given relationships are valid for bevel gears, of which the sum of profile shift coefficients of pinion and wheel is zero (see ISO 23509). This part of ISO 10300 does not apply to stress levels above those permitted for 103 cycles, as stresses in that range could exceed the elastic limit of the gear tooth. Warning — The user is cautioned that when the formulae are used for large average mean spiral angles (βm1 + βm2)/2 > 45°, for effective pressure angles αe > 30° and/or for large face widths b > 13 mmn, the calculated results of ISO 10300 (all parts) should be confirmed by experience.

ISO 10300-3:2014 Referenced Document

• ISO 10300-1:2014 Calculation of load capacity of bevel gears - Part 1: Introduction and general influence factors
• ISO 10300-2:2014 Calculation of load capacity of bevel gears - Part 2: Calculation of surface durability (pitting)
• ISO 1122-1:1998 Vocabulary of gear terms - Part 1: Definitions related to geometry
• ISO 23509:2006 Bevel and hypoid gear geometry
• ISO 6336-3:2006 Calculation of load capacity of spur and helical gears - Part 3: Calculation of tooth bending strength
• ISO 6336-5:2003 Calculation of load capacity of spur and helical gears - Part 5: Strength and quality of materials
• ISO 6336-6:2006 Calculation of load capacity of spur and helical gears - Part 6: Calculation of service life under variable load

ISO 10300-3:2014 history

• 2023 ISO 10300-3:2023 Calculation of load capacity of bevel gears — Part 3: Calculation of tooth root strength
• 2014 ISO 10300-3:2014 Calculation of load capacity of bevel gears - Part 3: Calculation of tooth root strength
• 2011 ISO 10300-3:2011 Calculation of load capacity of bevel gears — Part 3: Calculation of tooth root strength
• 2001 ISO 10300-3:2001 Calculation of load capacity of bevel gears - Part 3: Calculation of tooth root strength