Cylindrical gears - System of accuracy - Part 2: Definitions and allowable values of deviations relevant to radial composite deviations and runout information
1 Scope
This part establishes a system of accuracy relevant to radial composite deviations of individual cylindrical involute gears.
It specifies the appropriate definitions of gear tooth accuracy terms, the structure of the gear accuracy system and the allowable values of the above mentioned deviations.
The radial measurement accuracy system has different grade ranges than elemental ranges in GB/T 10095.1. The diameter and module ranges for radial composite deviations and runout are also different.
a) The radial composite accuracy system comprises 9 accuracy grades for Fi″ or fi″ of which grade 4 is the highest and grade 12 is the lowest. The module range extends from 0.2mm to 10mm and the diameter range from 5.0mm to 1,000mm, see Clauses 6 and 7. Annex A (informative) gives tables based on the equations in Clause 7.
b) Runout is defined in Annex B (informative) and values are not given in the standard for determining accuracy grade 5. Annex B provides information on runout for use if agreed upon between purchaser and manufacturer.
2 Normative references
The following normative documents contain provisions which, through reference in this part of GB/T 10095, constitute provisions of this part. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 10095.1-2008 Cylindrical gears - System of accuracy - Part 1: Definitions and allowable values of deviations relevant to corresponding flanks of gear teeth (ISO 1328-1:1995, IDT)
GB/T 2821-2003 International gear notation - Symbols for geometrical data (ISO 701:1998, IDT)
GB/T 3374 Basic terminology of gears (GB/T 3374-1992, neq ISO/R 1122-1:1983)
GB/Z 18620.2-2008 Cylindrical gears - Code of inspection practice - Part 2: Inspection related to radial composite deviations, runout, tooth thickness and backlash (ISO/TR 10064-2:1996, IDT)
3 Terms and definitions
For the purposes of this part, the terms and definitions given in GB/T 3374 apply.
ISO foreword i
ISO introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, quantities and units
5 Gear tooth accuracy terms and definitions relevant to radial composite deviations
6 Structure of the gear accuracy system
7 Equations for grade 5 accuracy tolerances for radial composite deviations
Annex A (informative) Tables of allowable values of radial composite deviations
Annex B (informative) Allowable values of runout with tolerance tables
Bibliography
