Already a subscriber?
MADCAD.com Free Trial
Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.
If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.
Security check
Please login to your personal account to use this feature.
Please login to your authorized staff account to use this feature.
Are you sure you want to empty the cart?
PD ISO/TS 14521:2020 Gears. Calculation of load capacity of worm gears, 2020
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and symbols
- 3.1 Terms and definitions
- 3.2 Symbols
- 4 General consideration
- 4.1 Worm gear load capacity rating criteria
- 4.2 Basis of the method
- 4.3 Concept of absolute and relative parameters
- 4.4 Applicability
- 4.5 Validity
- 4.6 System considerations
- 4.7 Calculation methods A, B, C
- 4.7.1 Generality on methods A, B and C
- 4.7.2 Notes on numerical formulae
- 4.7.3 Base conditions, interaction
- 4.7.4 Other notes
- 4.8 Standard reference gear
- 5 Required date for calculation
- 5.1 Input variable
- 5.2 Safety factors
- 6 Forces, speeds and parameters for the calculation of stresses
- 6.1 General
- 6.2 Tooth forces
- 6.2.1 Application factor
- 6.2.2 Dynamic factor
- 6.2.3 Load distribution factor
- 6.2.4 Tooth force components
- 6.3 Sliding velocity at reference diameter
- 6.4 Physical parameters
- 6.4.1 Generality on physical parameters
- 6.4.2 Parameter for the mean Hertzian stress
- 6.4.3 Parameter for the mean lubricant film thickness
- 6.4.4 Parameter for the mean sliding path
- 6.5 Calculation of mean contact stress
- 6.6 Calculation of mean lubricant film thickness
- 6.7 Calculation of the wear path
- 6.8 Calculation of the lubricant kinematic viscosity
- 7 Efficiency and power loss
- 7.1 General
- 7.2 Total efficiency
- 7.2.1 Method A
- 7.2.2 Method B
- 7.3 Total power loss
- 7.3.1 Methods of calculation
- 7.3.2 Idle running power loss
- 7.3.3 Bearing load power loss
- 7.3.4 Sealing power loss
- 7.3.5 Adaptation of the calculation procedure to a specific test
- 7.4 Gear efficiency
- 7.4.1 Efficiency calculation
- 7.4.2 Base coefficient of friction, µOT, of the standard reference gear
- 7.4.3 Size factor
- 7.4.4 Geometry factor
- 7.4.5 Material factor
- 7.4.6 Roughness factor
- 7.4.7 Adaptation of the calculation procedure to a specific test
- 7.5 Meshing power loss
- 7.5.1 Method A
- 7.5.2 Method B
- 7.5.3 Method C
- 8 Wear load capacity
- 8.1 General
- 8.2 Wear safety factor
- 8.3 Expected wear
- 8.3.1 Method A
- 8.3.2 Methods B, C
- 8.4 Permissible wear
- 8.5 Adaptation of the calculation procedure to a specific test
- 9 Surface durability (pitting resistance)
- 9.1 General
- 9.2 Pitting safety factor
- 9.3 Actual contact stress
- 9.3.1 Method A
- 9.3.2 Methods B, C
- 9.4 Limiting value of contact stress
- 9.5 Adaptation of the calculation procedure to specific test
- 10 Deflection
- 10.1 General
- 10.2 Deflection safety factor
- 10.3 Actual deflection
- 10.3.1 Method A
- 10.3.2 Method B
- 10.3.3 Method C
- 10.4 Limiting value of deflection
- 11 Tooth root strength
- 11.1 Safety factor for tooth breakage
- 11.2 Actual tooth root stress
- 11.2.1 Method A
- 11.2.2 Method B
- 11.2.3 Method C
- 11.3 Limiting value of shear stress at tooth root
- 11.3.1 General
- 11.3.2 Shear endurance limit, τF lim T
- 11.3.3 Life factor, YNL
- 11.4 Adaptation of the calculation procedure to a specific test
- 12 Temperature safety factor
- 12.1 Temperature safety factor for splash lubrication
- 12.1.1 General
- 12.1.2 Determination of oil sump temperature
- 12.1.3 Limiting values
- 12.2 Temperature safety factor for oil spray lubrication
- 12.2.1 General
- 12.2.2 Cooling capacity PK
- 13 Determination of the wheel bulk temperature
- 13.1 Wheel bulk temperature with splash lubrication
- 13.1.1 General
- 13.1.2 Method A
- 13.1.3 Method B
- 13.1.4 Method C
- 13.2 Wheel bulk temperature with spray lubrication
- 13.2.1 General
- 13.2.2 Method A
- 13.2.3 Method B
- 13.2.4 Method C
- Annex A (informative) Notes on physical parameters
- Annex B (normative) Methods for the determination of the parameters
- Annex C (normative) Lubricant film thickness according to the Elasto Hydrodynamic Lubrication (EHL) theory
- Annex D (normative) Wear path definition
- Annex E (informative) Notes on calculation wear
- Annex F (informative) Notes on tooth root strength
- Annex G (informative) Adaptation of formulae for the reference gear with results from testing
- Annex H (informative) Life time estimation for worm gears with a high risk of pitting damage
- Annex I (informative) Examples
- Annex J (informative) Examples of limit load capacity in a range of working conditions
- Bibliography [Go to Page]