BS ISO 17485:2006
Current
The latest, up-to-date edition.
Bevel gears. ISO system of accuracy
Hardcopy , PDF
English
31-07-2006
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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