GB/T 3480.2-2021Calculation of load capacity of spur and helical gears - Part 2: Calculation of surface durability(pitting) (English PDF)

National Standard of the People's Republic of China

ICS

21.200

Classification

J17

Issued by: State Administration for Market Regulation, China National Standardization Administration

Contents

• 1 Scope
• 2 Normative references
• 3 Terms, definitions, symbols and abbreviations
• 3.1 Terms and definitions
• 3.2 Symbols and abbreviations
• 4 Pitting damage and safety factor
• 5 Basic formula
• 5.1 Overview
• 5.2 Safety factor SH 6 of tooth surface contact strength (pitting corrosion)
• 5.3 Calculated value of contact stress σH
• 5.4 Allowable contact stress σHP
• 5.4.1 Overview
• 5.4.3 Determination of allowable contact stress σHP. Method B
• 6 Node area coefficient ZH and single pair of tooth meshing coefficients ZB and ZD
• 6.1 Overview
• 6.2 Determination of node area coefficient ZH
• 6.2.1 Overview
• 6.2.2 Graphical values
• 6.2.3 Analytical value
• 6.3 When εα≤2, the determination of the meshing coefficients ZB and ZD
• 6.4 When εα >2, the determination of the meshing coefficients ZB and ZD
• 7 Elasticity coefficient ZE
• 8 Coincidence coefficient Zε
• 8.1 Overview
• 8.2 Determination of the coincidence coefficient Zε
• 8.2.1 Graphical values
• 8.2.2 Analytical value
• 8.3 Determination of end-face coincidence εα and axial coincidence εβ
• 8.3.1 End-face coincidence εα
• 8.3.2 Axial coincidence εβ
• 9 Helix angle coefficient Zβ
• 10 Contact fatigue limit of test gear
• 10.1 Overview
• 10.2 Contact fatigue limit σHlim in Method B
• 10.3 Contact fatigue limit value in method BR
• 11 Life factor ZNT (tooth surface)
• 11.1 Overview
• 11.2 Life factor ZNT. Method A
• 11.3 Life factor ZNT. Method B
• 12 Lubricating oil film influence coefficient ZL, Zv and ZR
• 12.1 Overview
• 12.2 The effect of lubricating oil film. Method A
• 12.3 Lubricating oil film influence coefficients ZL, Zv and ZR. Method B
• 12.3.1 Overview
• 12.3.2 ZL, Zv and ZR at the limit of contact durability
• 12.3.3 Lubricating oil influence coefficients ZL, Zv and ZR under static strength
• 13 Working hardening coefficient of tooth surface ZW
• 13.1 Overview
• 13.2 Tooth surface working hardening factor ZW. Method A
• 13.3 Tooth surface working hardening factor ZW. Method B
• 13.3.1 Pairing of hardened small gears with hardened and tempered large gears
• 13.3.2 Pairing of quenched and tempered small gear and quenched and tempered large gear
• 13.3.3 Pairing of case-hardened small gears with nodular cast iron large gears
• 14 Size factor ZX
• 1 Scope
• 2 Normative references
• 3 Terms, definitions, symbols and abbreviations
• 3.1 Terms and definitions
• 5 Basic formula
• 5.1 Overview
• 5.2 Safety factor SH of tooth surface contact strength (pitting corrosion)
• 5.3 Calculated value of contact stress σH
• 5.4 Allowable contact stress σHP
• 5.4.1 Overview
• 5.4.2.1 Overview
• 5.4.2.2 Method A
• 5.4.2.3 Method B
• 5.4.2.4 Method BR
• 5.4.3 Determination of allowable contact stress σHP. Method B
• 12.3.3 Lubricating oil influence coefficients ZL, Zv and ZR under static strength
• 13 Tooth surface work hardening coefficient ZW
• 13.1 Overview
• 13.2 Tooth surface working hardening coefficient ZW. Method A
• 13.3 Tooth surface working hardening factor ZW. Method B
• 13.3.1 Pairing of hardened small gears with hardened and tempered large gears
• 13.3.1.1 Overview
• 13.3.1.2 Graphical value of ZW for durability limit and contact stress under high cycle fatigue