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INA bearing under load, have a week to turn in signs of flaking, outer ring only on short axis symmetric location of signs of falling off. This is the main reason for early failure of the bearing, the bearing failure tests showed that roundness of the bearing outer diameter process control has been removed from the original 0.8 μ m to 27 μ m. This value is much larger than the radial clearance values. Therefore, it is certain that the bearing is severely deformed and-clearance work, easy to face early proliferation of abnormal wear and spalling. 'S response is to improve precision or shell holes as far as possible in the shell holes in two separated structures.
1. Raceways inclined peeling:
INA bearing face tilted flaking on RIM, explain in a tilted bearing works, when when the slope angle reaches or exceeds the critical, early rapid wear and spalling of the exception. Formation is mainly due to the installation of poor shaft deflection, the precision axle journal and the shell holes and low, take measures to ensure the quality of bearing installation and greater shoulder, shoulder holes in axial runout accuracy.
2. Ring breakage:
Rings typically have fewer failure, often caused by sudden overloads. Causation is complex, such as the INA bearings raw material defects (bubbles, shrinkage), forging defect (fire), heat treatment defects (overheating), processing defects (partial burns or micro-cracks on the surface), host a defect (poor poor installation, lubrication, instantaneous overload), once with load shock load or high vibration is likely to make the ring fracture. Take countermeasures in order to avoid overload impact loads, select the appropriate interference, improve precision, use conditions and strengthened bearings of quality control in the manufacturing process.
3. Channel Flake is symmetric in the circumference location:
Symmetric circle around the rim, Peel Peel, flake patrons ring a week to the symmetric location (that is, the short axis of the ellipse), the cause is mainly due to the shell hole oval or in two separate shell structure, especially in the camshaft bearings for motorcycle. When the bearings pressed into the shell of the large oval hole or in two separate enclosures when you tighten, INA bearing outer oval, short axis clearance significantly lower or even negative clearance.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-33206 NTN | 30 | 62 | 25 |
| 4T-32206C NTN | 30 | 62 | 20 |