GB/T 41103-2022Rolling bearings - Ceramic cylindrical rollers - Boundary dimensions, geometrical product specifications(GPS) and tolerance values (English PDF)

A.1 Terminology explanation

A.1.1 The term explanations given in A.1.2~A.1.6 help to better understand the terms used in this appendix.

A.1.2 Roller diameter gauge

the difference between the average diameter of the roller diameter gauge batch (see A.1.3) and the nominal diameter of the roller. This quantity is one quantity in a defined series.

NOTE 1: Each roller diameter gauge is an integral multiple of the roller diameter gauge value spacing (see A.1.4) determined according to the roller grade (see 3.1).

NOTE 2: The combination of roller diameter gauge, roller grade and roller nominal diameter can be used as the most accurate roller size specification for users when ordering.

A.1.3 Roller diameter gauge lot

A batch of rollers with the same roller grade (see 3.1) and nominal size and the average diameter of a single flat roller within the same roller diameter gauge (see A.1.2).

A.1.4 Interval of roller diameter gauge, IGDw

the allowable mean diameter of roller diameter gauge lot (see A.1.5) after the average amount.

NOTE: The roller diameter gauge and the gauge interval are determined through negotiation between the user and the supplier.

A.1.5 Mean diameter of roller diameter gauge lot, DwmL

The average value of Dwmpx measured in the roller diameter gauge lot (see A.1.3).

NOTE: See Table 1 for Dwmpx.

A.1.6 Variation of roller diameter in a single plane, VDwsp: The difference between the largest and smallest single diameter of a roller in a single radial plane.

NOTE: See GB/T 6930-2002, 05.05.04.

A.2 Roller diameter gauge and grouping principle

See Figure A.1 for the relationship between the roller diameter gauge lot with a roller diameter gauge of +1µm and their diameter gauges.

Annex B (informative)

Roller length tolerance, gauge and grouping principles

B.1 Terminology explanation

B.1.1 The term explanations given in B.1.2~B.1.6 help to better understand the terms used in this appendix.

B.1.2 Roller length gauge

the difference between the average length of the roller length gauge lot (see B.1.3) and the nominal length of the roller. This quantity is one quantity in a defined series.

NOTE: Each roller length gauge is an integer multiple of the roller length gauge interval determined according to a certain roller nominal length.

B.1.3 Roller length gauge lot

a lot of rollers whose average roller length is within the same roller length gauge (see B.1.2).

B.1.4 Interval of roller length gauge, IGLw

the divided value of the allowable mean length of roller length gauge lot (see B.1.5).

B.1.5 Mean length of roller length gauge lot, LwmL

In a roller length gauge lot (see

B.1.3), the arithmetic mean of the average length of the longest roller and the shortest roller.

B.1.6 Variation of roller length gauge lot, VLwL

In a roller length gauge lot (see B.1.3), the difference between the average length of the roller with the largest average length and the roller with the smallest average length.

B.2 Roller length tolerance, gauge and grouping principles

For some cylindrical roller bearings, special application requirements may require that the cylindrical rollers fitted into the bearing be grouped according to specific length gauges shown in Table B.1 and Figure B.1.

Annex C (informative)

Examples of imperfection types and inspection methods

C.1 General

Silicon nitride bearing rollers may have imperfections listed in C.3.1. The inspection/inspection methods are listed in C.3.2.

C.2 Terms and explanations

C.2.1 The explanations of terms given in C.2.2 help to better understand the terms used in this appendix.

C.2.2 Surface imperfection

units, irregularities or groups of units and irregularities on the actual surface caused unintentionally or accidentally during processing, storage or use (revised 2.4 of ISO 8785:1998, replacing the note of the original term).

NOTE 1: The types of these elements or irregularities are distinct from those that make up the roughness profile. They are not considered during the measurement of the roughness profile.

NOTE 2: This document does not specify limit values for surface imperfections.

C.3 Imperfections

C.3.1 Imperfection types

The imperfection types are as follows:

- Inclusion;

- Stomata;

- Pitting;

- Scrapes;

- Scratches;

- Wear marks;

- Cracks;

- Chromatic aberration. […]