GB/T 20056-2015Rolling bearings -- Radial needle roller and cage assemblies -- Boundary dimensions and tolerances (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 20056-2006 "Rolling bearings - Radial needle

roller and cage assemblies - Dimensions and tolerances". Compared with GB/T

20056-2006, in addition to editorial modifications, the main technical changes

are as follows.

- modified the standard name;

- added the symbol of a single width deviation of cage and modified its

lower limit deviation value (see Clause 4 and Table 3 of this Edition, 5.2 of

Edition 2006);

- modified the annex "Tolerances for shaft raceway, housing raceway and

raceway widths" (see Annex A of this Edition, Annex A of Edition 2006).

This Standard uses translation method and identically adopts ISO 3030.2011

"Rolling bearings - Radial needle roller and cage assemblies - Boundary

dimensions and tolerances".

The Chinese documents which have consistency with the international

normative references in this Standard are as follows.

- GB/T 307.2-2005 Rolling bearings - Measuring and gauging principles

and methods (ISO 1132-2.2001, MOD)

- GB/T 309-2000 Rolling bearings - Needle rollers (neq ISO 3096.1996)

- GB/T 4199-2003 Rolling bearings - Tolerances - Definitions (ISO 1132-

1.2000, MOD)

- GB/T 6930-2002 Rolling bearings--Vocabulary (ISO 5593.1997, IDT)

- GB/T 7811-2015 Rolling bearings - Symbols for physical quantities (ISO

15241.2012, IDT)

This Standard was proposed by China Machinery Industry Federation.

This Standard 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 Standard. Luoyang Bearing Research

Institute Co., Ltd., Suzhou Bearing Factory Co., Ltd., Changzhou Koyo Bearing

Co., Ltd., Jining Jingyi Bearing Co., Ltd., Qidong Jinqiao Bearing Co., Ltd.

Main drafters of this Standard. Song Yucong, Zhang Wenhua, Qian Aifang,

Tang Weiqing, Fu Jilong, Liu Guoqiang.

Version of standard substituted by this Standard is.

- GB/T 20056-2006.

Rolling bearings - Radial needle roller and cage

assemblies - Boundary dimensions and tolerances

1 Scope

This Standard specifies the boundary dimensions for radial needle roller and

cage assemblies.

In addition, it gives the tolerances for the cage width and method of functional

gauging of smallest single bore diameter of needle roller complement.

Informative values for the tolerances of shaft raceway, housing raceway and

raceway widths are given in Annex A.

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 1132-1, Rolling bearings - Tolerances - Part 1. Terms and definitions

ISO 1132-2.2001, Rolling bearings - Tolerances - Part 2. Measuring and

gauging principles and methods

ISO 3096, Rolling bearings - Needle rollers - Dimensions and tolerances

ISO 5593, Rolling bearings - Vocabulary

ISO 15241, Rolling bearings - Symbols for quantities

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1132-

1 and ISO 5593 apply.

4 Symbols

For the purposes of this document, the symbols given in ISO 15241 and the

......