JB/T 118412014 PDF in English
JB/T 118412014 (JB/T118412014, JBT 118412014, JBT118412014)
Standard ID  Contents [version]  USD  STEP2  [PDF] delivered in  Name of Chinese Standard  Status 
JB/T 118412014  English  320 
Add to Cart

09 seconds. Autodelivery.

Rolling bearing parts. Metal solid cages. Specifications
 Valid 
Standards related to (historical): JB/T 118412014
PDF Preview
JB/T 118412014: PDF in English (JBT 118412014) JB/T 118412014
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Record No.: 456522014
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 selfaligning 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 doublerow 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 doubledirection 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 6991999 Quality Carbon Structural Steels
GB/T 11762013 Casting Copper and Copper Alloys
GB/T 13482009 Spheroidal Graphite Iron Castings
GB/T 2828.12012 Sampling Procedures for Inspection by Attribute  Part1:
Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for LotbyLot
Inspection
GB/T 4437.12000 Aluminum and Aluminum Alloy Extruded Tubes  Part 1:
Seamless Tubes
GB/T 4437.22003 Aluminum and Aluminum Alloy Extruded Tubes – Part 2: Seam
Tubes
GB/T 52312012 Designation and Chemical Composition of Wrought Copper and
Copper Alloys
GB/T 85972013 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 282682012 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 doublerow 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: actuallymeasured 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 doublerow 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 Noninterchangeable 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 selfaligning 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 twopoint 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 3coordinate 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 throughornothrough gauge. The through end can be passed
smoothly; while the nothrough 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 70512006.
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 2828.12012.
When using the special inspection Level S4, 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.
...... Source: Above contents are excerpted from the PDF  translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
