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INA purchase of the basic elements of the introduction of rolling bearings
Jan 12, 2018

In the design of the new spindle, select INA bearings, consider the spindle performance parameters, roughly determine the most critical performance, and then enter the further exploration. (Including: spindle speed, spindle accuracy, spindle rigidity, spindle life, spindle fever, spindle reliability)

After determining the spindle parameters, probe the actual dimensions of the spindle (shaft diameter, length, bearing span).

It is determined according to the setting of the spindle parameters such as bearing type (ball or cylindrical roller bearing), distribution (number of distribution), driving mode (belt, gear, motor and built-in motor) and lubrication (grease, oil and gas, oil mist and jet) Its structure.

1, radial load bearing

The main bearing radial load INA Bearing for the radial bearings. The nominal contact angle of such bearings a0 <= 450. Roller bearings of the same size have the greater radial load than ball bearings.

N-type and NU-type cylindrical roller bearings can only bear radial load, other types of radial bearings can withstand radial load, can withstand axial load.

2, the axial bearing load

The main thrust bearing axial load bearing is generally, its nominal contact angle a0> 450. Thrust bearings and thrust angular contact ball bearings according to different structures can withstand axial force in one or two directions at the same time. When the special force to withstand the preferred use of thrust cylindrical roller bearings and thrust spherical roller bearings.

Thrust spherical roller bearings and one-way thrust angular contact ball bearings can withstand both axial and radial load, and other thrust bearings can only bear axial load.

3, bearing length compensation

Support a shaft and bearings are usually fixed bearing and travel bearing combination of the structure. Traveling INA bearings compensate for shaft length error and thermal expansion.

NU and N-type cylindrical roller bearings are the ideal travel bearings, the bearings themselves can compensate for the length. Bearing inner and outer rings can be used with tight fit.

4, sliding with the length of compensation

Inseparable bearings can also be used as a traveling bearing. One of the two ferrules of this type of bearing is used with no axial fixing surface. Therefore, a collar of the bearing can move on its bearing surface.

Determine the precision bearing size, type, consider the specific design of the bearing.

Take full account of bearing fatigue life, rigidity, fever and other factors, choose the most appropriate bearing clearance (preload).

Due to bearing clearance and preload, the most crucial for the performance of INA bearings, the more the more critical high-speed operation, it must be carefully considered. Choose inappropriate, but also occur early damage or sintering and other issues. It is necessary to repeat from step 4 to step 3 or from step 4 to step 2.

After determining the design of the spindle structure, to consider the actual installation of the necessary conditions.

High-precision bearing mounting shaft and bearing precision, tolerance fit, tightening nut tightening force required for installation and fixing, after the actual installation INA bearing preload and internal clearance to confirm.