GB/T 3480.3-2021
Calculation of load capacity of spur and helical gears—Part 3: Calculation of tooth bending strength (English Version)

Standard No.

GB/T 3480.3-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Latest

GB/T 3480.3-2021

Replace

GB/T 3480-1997

Scope

This part of GB/T 3480 specifies the basic formula for calculating the bending stress of involute cylindrical internal and external spur gears and helical gears with a certain rim thickness (external gear SR>0.5ht and internal gear SR>1.75mn). This section considers all factors affecting the root stresses caused by the loads transmitted by the gears that can be quantitatively assessed. In practice, internal gears may produce failure modes different from gear bending fatigue, such as cracks starting from the root circle and extending radially outwards. The results of calculations in this section do not ensure an adequate safety assessment for non-bending fatigue failure modes. [][][]This part includes the experimental test and theoretical research carried out by Hi rt11, Strasse r14 and Bro os smann10 et al. The calculation results are consistent with other methods (References [5], [6], [7] and [12]). The formula given in this section is applicable to the cylindrical gear tooth profile processed by the basic rack-type tool in accordance with GB/T1356, and can also be used for the tooth profile whose equivalent gear end face coincidence degree εαn is less than 2.5 and can be conjugated with other basic racks. The load carrying capacity based on the allowable bending stress is called "tooth bending strength". This method of calculating the strength is consistent with other similar methods, which is described in the "scope" of ISO 6336-1. If this section is not applicable, refer to Chapter 4 of ISO 6336 1:2019.

GB/T 3480.3-2021 Referenced Document

• GB/T 1356-2001 Cylindrical gears for general and heavy engineering--Standard basic rack tooth profile
• GB/T 3374.1-2010 Vocabulary of gear terms-Part 1:Definitions related to geometry
• GB/T 3505-2009 Geometrical Product Specifications(GPS).Surface texture:Profile method.Terms,definitions and surface texture parameters
• ISO 6336-1 Calculation of load capacity of spur and helical gears — Part 1: Basic principles, introduction and general influence factors
• ISO 6336-5 Calculation of load capacity of spur and helical gears - Part 5: Strength and quality of materials

GB/T 3480.3-2021 history

• 2021 GB/T 3480.3-2021 Calculation of load capacity of spur and helical gears—Part 3: Calculation of tooth bending strength
• 1997 GB/T 3480-1997 Calculation methods of load capacity for involute cylindrical gears
• 0000 GB 3480-1983

GB/T 3480.3-2021 -All Parts