Standards related to:

JB/T 11841-2014JB/T 11841-2014

MACHINERY INDUSTRY STANDARD

OF THE PEOPLE’S REPUBLIC OF CHINA

ICS 21.100.20

J 11

Record No.: 45652-2014

Rolling Bearing Parts - Metal Solid Cages -

Specifications

ISSUED ON: MAY 06, 2014

IMPLEMENTED ON: OCTOBER 01, 2014

Issued by: Ministry of Industry and Information Technology of PRC

Table of Contents

Foreword ... 4

1 Scope ... 5

2 Normative References ... 5

3 Terms and Definitions ... 6

4 Symbols (See Figures 1~21) ... 9

5 Common Structure Types ... 11

6 Technical Requirements ... 18

6.1 Materials ... 18

6.2 Tolerance ... 19

6.3 Surface roughness ... 23

6.4 Appearance quality ... 23

6.5 Others ... 24

7 Inspection Method ... 24

7.1 Measurement for variations of the bore diameter and outside diameter in a

single plane (Vdcsp, VDcsp), and the variations of mean bore diameter and outside

diameter (Vdcmp, VDcmp) ... 24

7.2 Measurement for roundness error of the guide surface, ΔCir ... 25

7.3 Measurement for variation of wall thickness, VKcs ... 26

7.4 Measurement for variation of width, VBcs ... 26

7.5 Measurement for flatness, Pk ... 27

7.6 Measurement for variation of center circle diameter of pocket, VDcp, of cage for

cylindrical roller bearing ... 27

7.7 Measurement for variation of center circle diameter of pocket, VDcp, of cage for

spherical roller bearing ... 28

7.8 Measurement for variation of center circle diameter of pocket, VDcp, of cage for

thrust self-aligning roller bearing ... 29

7.9 Measurement for variation of radial distance of center of pocket to center of

bore, VKp ... 30

7.10 Measurement for variation of radial distance of center of pocket to bore

surface, VKp1 ... 31

7.11 Measurement for offset of pocket center line to theory center line, ΔP1 ... 32

7.12 Measurement for variation of chord length between any two adjacent pockets,

VC ... 32

7.13 Measurement for variation of chord length between double-row adjacent

pockets, VC2 ... 33

7.14 Measurement for variation of bottom height of pocket, Vhc ... 33

7.15 Measurement for variation of a single bottom height of pocket, Vhcs, of cage

for cylindrical roller bearing ... 34

7.16 Measurement for variation, Lc, of the cage for angular contact ball bearing

and double-direction thrust angular contact ball bearing ... 34

7.17 Measurement for variation, Lc, of the cage for thrust ball bearing ... 35

7.18 Measurement for variation of chord length between two adjacent rivet holes,

VC1 ... 35

7.19 Measurement for variation of thickness between rivet hole and pocket, Ve 36

7.20 Measurement for deviation of pocket center height, ΔK1 ... 36

7.21 Measurement for perpendicularity of the pocket centerline to the positioning

reference end face, f, of the cage for cylindrical roller bearing ... 37

7.22 Measurement for angle between the pocket centerline and centerline of the

cage, Θ, for spherical roller bearing ... 38

7.23 Test of nominal diameter of pocket, dc4, and nominal diameter of rivet hole,

dc5 ... 38

7.24 Measurement for perpendicularity of rivet hole centerline to the positioning

reference end face, f1 ... 38

7.25 Measurement for surface roughness ... 38

8 Inspection Rules ... 38

9 Markings, Package, Storage and Transportation ... 41

Rolling Bearing Parts - Metal Solid Cages -

Specifications

1 Scope

This Standard specifies the technical requirements for materials, tolerances,

appearance quality, as well as inspection methods, inspection rules, markings,

packaging, and storage of metal solid cages for rolling bearings.

This Standard is applicable to the production, inspection and acceptance of metal solid

cages.

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 document.

GB/T 699-1999 Quality Carbon Structural Steels

GB/T 1176-2013 Casting Copper and Copper Alloys

GB/T 1348-2009 Spheroidal Graphite Iron Castings

GB/T 2828.1-2012 Sampling Procedures for Inspection by Attribute - Part1:

Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot

Inspection

GB/T 4437.1-2000 Aluminum and Aluminum Alloy Extruded Tubes - Part 1:

Seamless Tubes

GB/T 4437.2-2003 Aluminum and Aluminum Alloy Extruded Tubes – Part 2: Seam

Tubes

GB/T 5231-2012 Designation and Chemical Composition of Wrought Copper and

Copper Alloys

GB/T 8597-2013 Rolling Bearings - Rust Proof Packaging

3.6 Variation of width, VBcs

The difference between the maximum and minimum single width of the two end faces

of the cage.

3.7 Flatness, Pk

The difference between the maximum and minimum heights of the plane on one side

of the cage at different angular positions along the diametrical direction inside and

outside perpendicular to the plane surface.

3.8 Variation of center circle diameter of pocket, VDcp

The difference between the maximum and the minimum center circle diameters of each

pocket on a single cage.

3.9 Variation of radial distance of center of pocket center of bore, VKp

The difference between the maximum and the minimum radial distances for the center

of each pocket to the center of bore on a single cage.

3.10 Variation of radial distance of center of pocket to bore surface, VKp1

The difference between the maximum and the minimum radial distances for the center

of each pocket go the bore surface on single cage.

3.11 Offset of pocket center line to theory center line, ΔP1

The circumferential offset distance of the actual center line of each pocket to the theory

center line of a single radial plane on the radial pocket of a single cage.

3.12 Variation of chord length between any two adjacent pockets, VC

The difference between the maximum and the minimum chord lengths for the two

plane.

3.20 Deviation of pocket center height, ΔK1

The difference between the pocket center height and the nominal pocket center height.

4 Symbols (See Figures 1~21)

The symbols given in GB/T 28268-2012 and the following are applicable to this

document:

Bc: nominal width of cage: nominal width of cage seat amplitude [see Figures 4~6,

Figure 13, Figure 18a), Figure 19a)].

Bc1: nominal width of cage seat.

Bc2: nominal width of cage cover.

bc: bar width of cage.

C: the equal chord length of the pocket on the pocket center circle of the cage

(hereinafter referred to as chord length).

C1: the equal chord length of the rivet hole on the rivet hole center circle of the cage.

C2: the chord length of double-row adjacent pocket.

Dc: nominal outside diameter of cage.

Dcp: nominal diameter of the pocket center circle of the cage.

Dcp1: nominal diameter of the rivet hole center circle of the cage.

Dcp2: nominal diameter of pocket bottom center circle of the cage for spherical roller

bearing.

Dw: nominal diameter of rolling element.

dc: nominal bore diameter of the cage.

dc4: nominal diameter of pocket the of the cage.

dc5: nominal diameter of rivet hole of the cage.

e: thickness between the rivet hole and the adjacent pocket of the cage.

f: perpendicularity of the pocket centerline to the positioning reference end face.

f1: perpendicularity of rivet hole centerline to the positioning reference end face.

hc: nominal height from the cage bottom surface the pocket bottom surface (hereinafter

referred to as hole bottom height).

K1: nominal height of pocket center.

Kc: nominal wall thickness of the cage.

Kp: radial distance from pocket center to the bore center.

Kp1: radial distance from the pocket center to the bore surface.

Lc: nominal length of pocket of the cage: actually-measured size (see Figures 14~16).

Lc1: nominal width of pocket of the cage.

Pk: flatness.

t1: nominal height of the cage boss (hereinafter referred to as boss height).

t2: nominal depth of the cage groove (hereinafter referred to as groove depth).

VBcs: variation of width: variation the cage seat Bc [see Figures 4~6, Figure 13, Figure

18a), Figure 19a)]

Vbc: variation of the bar width.

VC: variation of chord length between any two adjacent pockets.

VC1: variation of chord length between two adjacent rivet holes.

VC2: variation of chord length between double-row adjacent pockets.

VDcmp: variation of mean outside diameter.

VDcp: variation of center circle diameter of pocket.

VDcsp: variation of outside diameter in a single plane.

Vdcmp: variation of mean bore diameter.

Vdcsp: variation of bore diameter in a single plane.

Ve: variation of thickness between rivet hole and pocket.

with the provisions of the manufacturer or in consultation with the user.

6.5 Others

6.5.1 Non-interchangeable cages with separated structure, for the convenience of

assembly, are allowed to be marked on the outer cylindrical surface or inner cylindrical

surface of the cage (or typed on the end face).

6.5.2 The cage shall be able to rotate flexibly under the condition of the complete set

of bearings. There is no obvious difference in the forward and reverse rotation of the

bearing. The self-aligning performance is good. There is no abnormal sound. The ball

should not be caught or dropped.

6.5.3 The cage with radial positioning at the stop shall not have a clearance greater

than that specified by the manufacturer or the user.

6.5.4 The junction between the cylindrical surface of the pocket bottom plane of the

machined solid cage shall be a smooth arc transition and there shall be no acute angle.

6.5.5 The middle of pocket bottom of the machined cage for cylindrical roller bearings

and spherical roller bearings may be made into a conical recess with a diameter of no

more than 1/2 pocket diameter and a cone angle of no more than 170 °.

6.5.6 After the combination of cage with separated structure, the tolerances shall not

exceed the provisions of 6.2.

6.5.7 When the user has dynamic balancing requirements for the cage, it may be

determined through consultation with the user.

7 Inspection Method

7.1 Measurement for variations of the bore diameter and outside diameter in a

single plane (Vdcsp, VDcsp), and the variations of mean bore diameter and outside

diameter (Vdcmp, VDcmp)

The following measurement methods can be adopted:

a) Measure by the two-point method (see Figure 22). Place the tested cage on the

platform and position it from the inner (outer) cylindrical surface. The measuring

point is 180° with one of the fulcrum points. Measure in any single radial plane

at a double chamfer from the end face of the cage; the cage is rotated for more

than one revolution; and the difference between the measured maximum value

and the minimum value is variations of the bore diameter and outside diameter

in a single plane, Vdcsp and VDcsp. Take repeated measurements in several radial

planes to calculate the variations of mean bore diameter and outside diameter,

7.22 Measurement for angle between the pocket centerline and centerline of the

cage, Θ, for spherical roller bearing

The following measurement methods may be adopted:

a) Measure by universal protractor;

b) Measure by special measuring sample column;

c) Measure by 3-coordinate measuring machine.

7.23 Test of nominal diameter of pocket, dc4, and nominal diameter of rivet hole,

dc5

The following test methods may be adopted:

a) Test by the through-or-no-through gauge. The through end can be passed

smoothly; while the no-through end shall not exceed 1/3 length of the pocket

(rivet hole);

b) The nominal diameter of pocket, dc4, may be measured by the bore diameter

meter.

7.24 Measurement for perpendicularity of rivet hole centerline to the positioning

reference end face, f1

Measure by the measuring tool with sufficient accuracy.

7.25 Measurement for surface roughness

Measure by the provisions of JB/T 7051-2006.

8 Inspection Rules

8.1 The appearance quality of the cage shall be inspected for 100%.

8.2 The sampling inspection of the cage shall be as specified in GB/T 2828.1-2012.

When using the special inspection Level S-4, the Acceptance Quality Limit (AQL) of

the primary inspection items shall be 1.0; while the Acceptance Quality Limit (AQL) of

the secondary inspection items shall be 4.0. For the products with special requirements,

the sampling scheme and acceptance level shall be determined through the

negotiation between the user and the manufacturer. The primary inspection items of

various cages can refer to Table 12.

...