BS ISO 6336-1:2019 - Calculation of load capacity of spur and helical gears. Basic principles, introduction and general influence factors

BS ISO 6336-1:2019

Calculation of load capacity of spur and helical gears. Basic principles, introduction and general influence factors

Status : Current   Published : November 2019



This document presents the basic principles of, an introduction to, and the general influence factors for the calculation of the load capacity of spur and helical gears. Together with the other documents in the ISO 6336 series, it provides a method by which different gear designs can be compared. It is not intended to assure the performance of assembled drive gear systems. It is not intended for use by the general engineering public. Instead, it is intended for use by the experienced gear designer who is capable of selecting reasonable values for the factors in these formulae based on the knowledge of similar designs and the awareness of the effects of the items discussed.

The formulae in the ISO 6336 series are intended to establish a uniformly acceptable method for calculating the load capacity of cylindrical gears with straight or helical involute teeth.

The ISO 6336 series includes procedures based on testing and theoretical studies as referenced by each method. The methods are validated for:

  • normal working pressure angle from 15° to 25°;

  • reference helix angle up to 30°;

  • transverse contact ratio from 1,0 to 2,5.

If this scope is exceeded, the calculated results will need to be confirmed by experience.

The formulae in the ISO 6336 series are not applicable when any of the following conditions exist:

  • gears with transverse contact ratios less than 1,0;

  • interference between tooth tips and root fillets;

  • teeth are pointed;

  • backlash is zero.

The rating formulae in the ISO 6336 series are not applicable to other types of gear tooth deterioration such as plastic deformation, case crushing and wear, and are not applicable under vibratory conditions where there can be an unpredictable profile breakdown. The ISO 6336 series does not apply to teeth finished by forging or sintering. It is not applicable to gears which have a poor contact pattern.

The influence factors presented in these methods form a method to predict the risk of damage that aligns with industry and experimental experience. It is possible that they are not entirely scientifically exact. Therefore, the calculation methods from one part of the ISO 6336 series is not applicable in another part of the ISO 6336 series unless specifically referenced.

The procedures in the ISO 6336 series provide rating formulae for the calculation of load capacity with regard to different failure modes such as pitting, tooth root breakage, tooth flank fracture, scuffing and micropitting. At pitch line velocities below 1 m/s the gear load capacity is often limited by abrasive wear (see other literature such as References [23] and [22] for further information on such calculation).

Standard NumberBS ISO 6336-1:2019
TitleCalculation of load capacity of spur and helical gears. Basic principles, introduction and general influence factors
Publication Date29 November 2019
Normative References(Required to achieve compliance to this standard)ISO 53:1998, ISO 1328-1:2013, BS ISO 1122-1:1998, ISO 21771:2007, ISO 6336-6, ISO 6336-5, ISO 6336-2, ISO 6336-3
Informative References(Provided for Information)ISO/TS 16281, ISO/TR 10064-3:1996, TGL 10545, ISO/TS 6336-22, IEC 61400-4, DIN 3990, ISO 4287, ISO 4288, ISO/TS 6336-4, ISO/TS 6336-20, ISO/TS 6336-21, ISO/TR 10064-1, ISO 701:1998 (R08), ISO 54:1996
International RelationshipsISO 6336-1:2019
Draft Superseded By18/30377010 DC
DescriptorsSymbols, Pitting corrosion, Load capacity, Design calculations, Bend testing, Resonance, Mathematical calculations, Gear parameters, Spur gears, Formulae (mathematics), Gear drives, Mechanical transmission systems, Corrosion resistance, Design, Torque, Tangential, Helical gears
Title in FrenchCalcul de la capacité de charge des engrenages cylindriques à dentures droite et hélicoïdale Principes de base, introduction et facteurs généraux d'influence
ISBN978 0 539 00804 3
File Size4.849 MB

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