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JB/T 8878-2011 PDF English

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JB/T 8878-2011: Rolling bearings - Drawn cup needle roller bearings - Specifications
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Status: Valid

JB/T 8878: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
JB/T 8878-2011English70 Add to Cart 0-9 seconds. Auto-delivery Rolling bearings - Drawn cup needle roller bearings - Specifications Valid
JB/T 8878-2001English319 Add to Cart 3 days Rolling bearings. Drawn up needle roller bearings. Specifications Obsolete
JB/T 8878-1999EnglishRFQ ASK 3 days (Chinese Industry Standard) Obsolete

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Similar standards

GB/T 12765   GB/T 5859   JB/T 8881   

JB/T 8878-2011: Rolling bearings - Drawn cup needle roller bearings - Specifications

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT8878-2011
JB MECHANICAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.100.20 J 11 Registration number. 34884-2012 Replacing JB/T 8878-2001 Rolling bearings - Drawn cup needle roller bearings - Specifications Issued on: DECEMBER 20, 2011 Implemented on: APRIL 01, 2012 Issued by. Ministry of Industry and Information Technology of PRC

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 5 4 Symbols (see Figure 1) ... 5 5 Technical requirements ... 6 5.1 Materials and heat treatment ... 6 5.2 Tolerance ... 6 5.3 Others ... 7 6 Testing methods ... 7 7 Inspection rules ... 8 8 Markings ... 8 9 Anti-rust packaging ... 8 Appendix A (Informative) Technical requirements for shafts and housing bores matched with bearings ... 9 A.1 Shaft matched with the bearing ... 9 A.2 Housing bores matched with the bearing ... 9 Appendix B (Informative) Recommended installation method ... 10 Rolling bearings - Drawn cup needle roller bearings - Specifications

1 Scope

This standard specifies the technical conditions for general purpose non-inner ring and drawn cup needle roller bearings (hereinafter referred to as bearings) which comply with the provisions of GB/T 290-1998 and GB/T 12764-2009. This standard applies to the production, inspection and acceptance of bearings.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 290-1998 Rolling bearings - Needle roller bearings, drawn cup without inner rings - Boundary dimensions GB/T 307.2-2005 Rolling bearings - Measuring and gauging principles and methods GB/T 1957-2006 Tolerances and general features for plain limit gauges GB/T 4199-2003 Rolling bearings - Tolerances - Definitions GB/T 4340.1-2009 Metallic materials - Vickers hardness test - Part 1. Test method GB/T 5213-2008 Cold rolled low carbon steel sheet and strip GB/T 6930-2002 Rolling bearings - Vocabulary GB/T 7811-2007 Rolling bearings - Symbols for quantities GB/T 8597-2003 Rolling bearings - Rust proof packaging GB/T 12764-2009 Rolling bearings - Needle roller bearings, drawn cup without inner ring - Boundary dimensions and tolerances GB/T 24605-2009 Rolling bearings - Marking for products

Appendix A

(Informative) Technical requirements for shafts and housing bores matched with bearings A.1 Shaft matched with the bearing A.1.1 The hardness of the journal’s fit surface is not less than 58 HRC. A.1.2 The maximum surface roughness of the journal’s fit surface is Ra0.2 μm. A.1.3 The journal has a dimensional tolerance of h5 (h6). A.1.4 The cylindricity of the journal’s fit surface shall not exceed 50% of the dimensional tolerance of the shaft. A.2 Housing bores matched with the bearing A.2.1 The maximum surface roughness of the fit surface of the housing bore is Ra0.8 μm. A.2.2 Dimensional tolerance of the housing bore is selected according to the material of the seat based on Table A.1. Table A.1 Materials of bearing seat Dimensional tolerance of bearing seat’s bore Steel or cast iron Light alloy or wall thickness less than 6 mm N6 (N7) R6 (R7) A.2.3 The cylindricality of the fit surface of the housing bore shall not exceed 50% of the dimensional tolerance of the housing bore. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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