Questions about bearing clearance and machining tolerances

The surface of the bearing raceway shall be ground without waviness. When the surface roughness is > 0.2 μm, the bearing cannot fully exert its bearing capacity.

The bearing clearance of the directly supported bearing depends on the diameter tolerance of the shaft and the bore.

The shaft, hole and company that are matched with the direct support bearing are also different from ordinary shafts and holes.

Fixed bearings and floating bearings, fixed bearings at both ends and floating bearings at both ends, they have different guiding functions. The axial fixing of the bearing ring is determined according to the bearing configuration.

One end fixed end one swimming support

Fixed bearings are only subjected to large axial forces and the fixed parts must also be determined from this. Fixed parts include: shoulders for shafts and holes, circlips, end caps for bearings, shaft end rings, nuts, spacers, etc.

The travel bearing is only subjected to very small axial forces caused by thermal expansion. Its axial positioning is only to avoid axial displacement of the bearing ring. In this case, a tight fit can be used to meet the requirements. When using non-separable bearings, only one ferrule is fixed and the other is only constrained by the rolling elements.

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Application range of FAG bearing crossed roller bearings

FAG bearing cross-roller bearings can withstand loads from all directions (such as axial, thrust or momentum loads). Since the FAG bearing is in contact with the outer surface of the track, the bearing is subject to load and elastic deformation is small.

This type of FAG imported bearings are commonly used in industrial robots, mission machinery and medical facilities. FAG bearings require high rigidity, tightness and high speed to ensure accurate position in cross-roller bearings, due to cylindrical rollers. The FAG bearings are arranged perpendicular to each other by a distance maintaining device on a 90° V-shaped groove rolling surface, so that one crossed roller bearing can withstand loads in all directions such as radial load, axial load and moment load.

The size of the inner and outer rings is minimized, and the special ultra-thin type is a small size close to the limit and has high rigidity, so it is most suitable for the joint portion or the rotating portion of the industrial robot.

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