JB/T 11841-2014Rolling bearing parts - Metal solid cages - Specifications (English PDF)

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, delta P1

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 […]

3.20 Deviation of pocket center height, deltaK1

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

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.

7.1

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, theta, 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.

8.1

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.