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BS ISO 17485:2006

Current

Current

The latest, up-to-date edition.

Bevel gears. ISO system of accuracy

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-2006

€254.76
Excluding VAT

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Terms and definitions
  3.2 Fundamental terms and symbols
4 Application of classification system
  4.1 General
  4.2 Accuracy grade classification
  4.3 Tolerance direction
  4.4 Additional characteristics
5 Tolerances
  5.1 Tolerance values
  5.2 Step factor
  5.3 Rounding rules
  5.4 Tolerance equations
6 Application of measuring methods
  6.1 Methods of measurement
  6.2 Recommended measurement control methods
  6.3 Measurement data filtering
  6.4 Tooth contact pattern inspections
Annex A (informative) Example tolerance tables
Annex B (informative) Single-flank composite measuring
        method
Annex C (informative) Accuracy of small module bevel gears
Annex D (informative) Interpretation of composite data
Bibliography

Establishes a classification system that can be used to communicate geometrical accuracy specifications of unassembled bevel gears, hypoid gears, and gear pairs. Defines gear tooth accuracy terms, and specifies the structure of the gear accuracy grade system and allowable values.

Committee
MCE/5
DevelopmentNote
Supersedes 05/30128083 DC. (08/2006)
DocumentType
Standard
Pages
42
PublisherName
British Standards Institution
Status
Current
Supersedes

This International Standard establishes a classification system that can be used to communicate geometrical accuracy specifications of unassembled bevel gears, hypoid gears, and gear pairs. It defines gear tooth accuracy terms and specifies the structure of the gear accuracy grade system and allowable values.

This International Standard provides the gear manufacturer and the gear buyer with a mutually advantageous reference for uniform tolerances. Ten accuracy grades are defined, numbered 2 to 11 in order of decreasing precision. Equations for tolerances and their ranges of validity are provided in 5.4 for the defined accuracy of gearing. In general, these tolerances cover the following ranges:

1,0 mm ≤ mmn ≤ 50 mm

5 ≤ z ≤ 400

5 mm ≤ dT ≤ 2 500 mm

where

dT is the tolerance diameter;
mmn is the mean normal module;
z is the number of teeth.

See Clause 6 for required and optional measuring methods. As tolerances are calculated from the actual dimensions of a bevel gear, tolerance tables are not provided. In order to provide an overview, example values of tolerances and graphs are given in Annex A.

This International Standard does not apply to enclosed gear unit assemblies, including speed reducers or increasers, gear motors, shaft mounted reducers, high speed units, or other enclosed gear units manufactured for a given power, speed, ratio or application.

Gear design is beyond the scope of this International Standard. The use of the accuracy grades for the determination of gear performance requires extensive experience with specific applications. Therefore, the users of this International Standard are cautioned against the direct application of tolerance values to a projected performance of unassembled (loose) gears when they are assembled.

Tolerance values for gears outside the limits stated in this International Standard will need to be established by determining the specific application requirements. This could require the setting of a tolerance other than that calculated by the formulas in this International Standard.

Standards Relationship
ISO 17485:2006 Identical

ISO 1328-2:1997 Cylindrical gears ISO system of accuracy Part 2: Definitions and allowable values of deviations relevant to radial composite deviations and runout information
ISO 1328-1:2013 Cylindrical gears — ISO system of flank tolerance classification — Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth
AGMA 2005 : D DESIGN MANUAL FOR BEVEL GEARS
ISO/TR 10064-6:2009 Code of inspection practice Part 6: Bevel gear measurement methods
AGMA 2008 : C ASSEMBLING BEVEL GEARS
ISO/TR 10064-3:1996 Code of inspection practice Part 3: Recommendations relative to gear blanks, shaft centre distance and parallelism of axes
ISO 10300-1:2014 Calculation of load capacity of bevel gears — Part 1: Introduction and general influence factors
ISO 23509:2016 Bevel and hypoid gear geometry
ISO/TR 10064-4:1998 Code of inspection practice Part 4: Recommendations relative to surface texture and tooth contact pattern checking
ISO/TR 10064-5:2005 Code of inspection practice Part 5: Recommendations relative to evaluation of gear measuring instruments

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