JB/T 8922-2011Rolling bearings - Specifications for vibration (velocity) of cylindrical roller bearings (English PDF)

1 Scope

This standard specifies the vibration (velocity) technical conditions of the N-type, NU- type, NJ-type, NF-type cylindrical roller bearings, whose external dimensions conform to GB/T 283-2007, which have a diameter series 2 and 3, a nominal inner diameter of 15 mm ~ 120 mm, a radial clearance conforming to group 0 clearance specified in GB/T 4604-2006 (hereinafter referred to as bearings).

Group V specified in this standard is the basic requirement for vibration (velocity) of general-purpose bearings. "V" is not marked on the bearings. Groups V1, V2, V3 are suitable for bearings that require vibration (velocity).

This standard applies to the production inspection and user acceptance of finished bearings by the manufacturer.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.

GB/T 283-2007 Rolling bearings - Cylindrical roller bearings - Boundary dimensions

GB/T 2828.1-2003 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (ISO 2859-1:1999, IDT)

GB/T 3141-1994 Industrial liquid lubricants - ISO viscosity classification (eqv ISO 3448:1992)

GB/T 4604-2006 Rolling bearings - Internal clearance - Part 1: Radial internal clearance for radial bearings (ISO 5753:1991, MOD)

GB/T 24610.1-2009 Rolling bearings - Measuring methods for vibration - Part 1: Fundamentals (ISO 15242-1:2004, IDT)

GB/T 24610.4-2009 Rolling bearings - Measuring methods for vibration - Part 4: Radial cylindrical roller bearings with cylindrical bore and outside surface (ISO 15242-4:2007, IDT)

JB/T 2974-2004 Rolling bearings - Identification code - Supplemental regulations

3 Terms and definitions, group code

3.1 The terms and definitions, which are defined in GB/T 24610.4-2009, apply to this standard.

3.2 The vibration group codes, which are established in JB/T 2974-2004, are applicable to this standard.

4 Measurement and evaluation methods

4.1 The measurement method shall be in accordance with the provisions in Appendix A.

4.2 Under the specified measurement method, select three positions for measurement, which are approximately equidistant in the circumferential direction of the outer cylindrical surface of the bearing outer ring. The arithmetic mean value of the vibration (velocity) of the three positions, in a certain frequency band, is the vibration (velocity) of the bearing in this frequency band. For bearings that need to be tested on both sides, take the larger vibration (velocity) value of a certain frequency band on the two sides as the vibration (velocity) value of this frequency band of the bearing.

5 Technical requirements

5.1 For cylindrical roller bearings, which have an inner diameter of 15 mm ~ 60 mm, the vibration (velocity) of individual bearings of different groups shall meet the requirements in Table 1.

5.2 For cylindrical roller bearings, which have an inner diameter of 65 mm ~ 120 mm, the vibration (velocity) of individual bearings of different groups shall meet the requirements in Table 2.

6 Inspection rules

6.1 A single bearing (referring to any set of bearings in the sample) is measured according to the provisions of this standard. When the vibration (velocity) value of any The physical quantity, which is set during measurement, is the radial vibration velocity Vr.m.s (unit in µm/s).