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

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020

"Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents".

This document identically adopts ISO 12297-2:2018 "Rolling bearings - Cylindrical

rollers - Part 2: Boundary dimensions, geometrical product specifications (GPS) and

tolerance values for ceramic rollers".

The following minimal editorial changes have been made to this document:

- the standard's name is changed to "Rolling bearings - Ceramic cylindrical rollers -

Boundary dimensions, geometrical product specifications (GPS) and tolerance

values".

Attention is drawn to the possibility that some of the elements of this document may be

the subject of patent rights. The issuing authority shall not be held responsible for

identifying any or all such patent rights.

This document was proposed by China Machinery Industry Federation.

This document shall be under the jurisdiction of National Technical Committee on

Rolling Bearings of Standardization Administration of China (SAC/TC 98).

The drafting organizations of this document: Luoyang Bearing Research Institute Co.,

Ltd., Changshu Great Wall Bearing Co., Ltd., Guochuang (Luoyang) Bearing Industry

Technology Research Institute Co., Ltd., Jiangsu Lixing General Steel Ball Co., Ltd.

Main drafters of this document: Zhang Bowen, Zhao Binhai, Wang Zhiliang, Ye Jun,

Sha Xiaojian.

Rolling bearings - Ceramic cylindrical rollers - Boundary

dimensions, geometrical product specifications (GPS) and

tolerance values

1 Scope

This document specifies the dimensional and geometric properties, nominal dimensions

and tolerance values of finished silicon nitride cylindrical rollers for rolling bearings.

This document is applicable to the production, inspection and acceptance of ceramic

cylindrical rollers for rolling bearings.

Annexes A and B give the specifications and grouping principles of roller diameter and

roller length respectively. Annex B also gives roller length tolerances.

Annex C gives examples of roller imperfection types and inspection methods.

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 of the referenced document (including any amendments) applies.

ISO 4288, Geometrical Product Specifications (GPS) - Surface texture: Profile

method - Rules and procedures for the assessment of surface texture

NOTE: GB/T 10610-2009, Geometrical product specifications (GPS) - Surface texture: Profile

method - Rules and procedures for the assessment of surface texture (ISO 4288:1996, IDT)

ISO 26602, Fine ceramics (advanced ceramics, advanced technical ceramics) -

Silicon nitride materials for rolling bearing balls and rollers

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

The terminology databases used in the standardization work maintained by ISO and

IEC can be found at the following URLs:

- ISO online browsing platform: https://www.iso.org/obp;

Annex A

(informative)

Roller diameter gauge value and grouping principle

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.

......