GB/T 32334-2015 Rolling bearings - Matched angular contact ball bearings - Specifications
1 Scope
This standard specifies the terms and definitions, symbols, matching types, technical requirements, measurement methods, inspection rules, marking, packaging and fitting of paired and matched angular contact ball bearings (hereinafter referred to as matched bearings) with the overall dimensions meeting the requirements of GB/T 292.
This standard is applicable to the production inspection and user acceptance of matched angular contact ball bearings.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 272 Rolling bearings - Identification code
GB/T 275 Rolling bearings - Fits
GB/T 292 Rolling bearings - Angular contact ball bearings - Boundary dimensions
GB/T 307.2 Rolling bearings－Measuring and gauging principles and methods
GB/T 307.3 Rolling bearings - General technical regulations
GB/T 4199 Rolling bearings - Tolerances - Definitions
GB/T 6930 Rolling bearings - Vocabulary
GB/T 7811 Rolling bearings - Symbols for physical quantities
GB/T 8597 Rolling bearings - Rust proof packaging
GB/T 18254 High-carbon chromium bearing steel
GB/T 24605 Rolling bearings - Marking for products
GB/T 24608 Inspection rules for rolling bearings and commercial parts
JB/T 2974 Rolling bearings - Identification code - Supplemental regulations
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 4199 and GB/T 6930 and the following apply.
3.1
paired bearing
a bearing set consisting of two sets of bearings in back-to-back, face-to-face or tandem arrangement, hereinafter referred to as paired bearing
3.2
matched bearing sets
a bearing set consisting of three or more sets of bearings in such mode as back-to-back, face-to-face or tandem arrangement
3.3
universally matchable bearings
bearings in back-to-back, face-to-face or tandem arrangement, which can be changed in position at will
3.4
preload
certain load pre-imposed on the matched bearings to generate a "negative clearance" in the bearings, so to increase the bearing rigidity, also known as preload
3.5
pre-clearance
certain clearance preset in bearings in back-to-back or face-to-face arrangement, also known as preset clearance
3.6
stand (stickout)
axial distance between the end faces of two rings at the back end face or the front end face of a single set of bearing in matched bearings
4 Symbols
For the purposes of this document, the symbols given in GB/T 7811 and the following apply.
b: ring stand on the back end face of a single set of bearing in matched bearings
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Matching types of bearings
6 Technical requirements
7 Measurement methods
8 Inspection rules
9 Marking
10 Packaging
11 Fitting
Annex A (Normative) Class 4A and 2A tolerances
Annex B (Informative) Preload of paired bearing
Annex C (Informative) Fitting of matched bearings with tolerance of Class 5 and above with shaft and bearing housing hole
