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JB/T 10235-2001 PDF English

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JB/T 10235-2001: Rolling bearings - Tapered roller - Technical specifications
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GB/T 5859   GB/T 12765   JB/T 10238   

JB/T 10235-2001: Rolling bearings - Tapered roller - Technical 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/JBT10235-2001
MECHANICAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.100.20 J 11 Rolling bearings - Tapered roller - Technical specifications ISSUED ON: MAY 23, 2001 IMPLEMENTED ON: OCTOBER 01, 2001 Issued by: China Machinery Industry Federation

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms, symbols, definitions ... 5 4 Shape and dimension ... 6 5 Technical requirements ... 6 6 Measurement method ... 9 7 Markings ... 11 8 Inspection rules ... 11 9 Packaging and storage ... 11 Appendix A (Normative) Measurement method of roundness error ... 13 Rolling bearings - Tapered roller - Technical specifications

1 Scope

This standard specifies the tolerance grades, technical requirements, measurement and inspection methods, inspection rules, marking and packaging of tapered rollers. This standard applies to the production, inspection, user acceptance of tapered rollers, which match the rolling bearing, AND the commercial tapered rollers (hereinafter referred to as rollers).

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. The versions indicated at the time of publication of this standard are valid. All standards are subjected to revision, AND parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. GB/T 307.3-1996 Rolling bearings - General technical regulations GB/T 4380-1984 Assessment of departure from roundness - Two and three point methods GB/T 6930-1986 Rolling bearings - Vocabulary JB/T 1255-2001 Specification for heat-treatment of rolling bearing parts made from high carbon chromium steel JB/T 3034-1993 Rolling bearings - Oil seal rust prevention packaging JB/T 6642-1993 Rolling bearing parts - Methods for the measurement and assessment of departure from roundness and waviness JB/T 7051-1993 Rolling bearing parts - Methods for the measurement and assessment of surface roughness JB/T 7361-1994 Rolling bearings - Test method for hardness of parts JB/T 8196-1996 Rolling bearings - Residual magnetism and its assessment method JB/T 8881-2001 Specifications for carburizing heat treatment of rolling bearing parts JB/T 8921-1999 Rolling bearings and commercial parts - Inspection rules

3 Terms, symbols, definitions

The following terms, that are not defined, are in accordance with the provisions of GB/T 6930. 3.1 Nominal diameter of roller, Dw The maximum theoretical diameter of the roller's big end, in the radial plane, including the imaginary sharp corners. 3.2 Roller's single diameter, Dws 3.3 Roller's single plane average diameter, Dwmp 3.4 Roller's single plane diameter variation, VDmp 3.5 Nominal roller length, Lw 3.6 Cone angle, 2φ 3.7 Cone angle deviation, Δ2φ In any axial plane of the roller, the difference -- BETWEEN the angle between the two elements of the tapered surface of the roller AND the nominal cone angle of the roller. 3.8 Roundness error ΔCir 3.9 Roller's reference end face circular runout, SDw The difference, between the maximum and minimum axial distances, FROM each point on a circle -- on the reference end face of the roller, at a distance of 1.2 times the maximum chamfering dimension of the roller, where the center of the circle is on the axis of the roller -- TO a radial plane. 3.10 Roller's gauge value In the radial plane in the middle of the roller length, the diameter deviation range, which is defined by the upper and lower deviations of the average diameter of the single plane of the roller, as deviated from the nominal diameter. 3.11 Gauge batch A batch of rollers of the same tolerance grade and the same nominal size, whose single-plane average diameter Dwmp and taper angle are within the same 6.8 Cracks The roller crack inspection shall be carried out, according to the method specified in JB/T 1255.

7 Markings

7.1 Contents of the marking a) Type: Tapered roller. b) Nominal size of roller: Dw × Lw × 2φ, unit (mm) not marked. c) Roller tolerance grade: According to (0), I, II, III signs, respectively. d) Roller gauge value: Expressed by the upper and lower deviation, unit (μm) not marked. e) Standard number and supplementary technical condition code to which the roller conforms. 7.2 Method of marking In the order form, certificate of conformity and packaging of the rollers, where it needs to be marked, mark them in the order of the contents in 7.1, with a space between each item. 7.3 Examples of markings Tapered roller 9.437×12.48×4° III-1/-4 JB/T 10235-2001 Indicates the tapered roller, which conforms to JB/T 10235-2001, has a nominal diameter of 9.437 mm, a nominal length of 12.48 mm, a taper angle of 4°, a tolerance grade III, a gauge value of -1, -4 μm, a diameter variation of the gauge batch of 3 μm.

8 Inspection rules

The inspection rules for finished rollers are in accordance with the provisions of JB/T 8921.

9 Packaging and storage

9.1 Packaging 9.1.1 Commodity rollers, that have passed the inspection, shall have rust-proof ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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