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Introduction to the basic elements of INA rolling bearings

In the design of the new spindle, select INA bearings, the first consideration of the spindle performance parameters, roughly determine the most critical performance, and then enter the further exploration. (including: spindle speed, spindle precision, spindle rigidity, spindle life, spindle heating, spindle reliability)

After deciding the main parameters of the spindle, the actual size of the probe (shaft diameter, length, bearing span).

According to the form of bearing (a ball or cylindrical roller bearings), arrangement (with the number of columns), drive (driving belt, a gear, a motor, a motor arranged in a), lubricant (grease, oil and gas, oil mist, injection) spindle parameters set to determine its structure.

1, bearing radial load

The main bearing radial load of INA bearings for radial bearings. Nominal contact angle of this kind of bearing a0<=450. The same roller bearing can bear more radial load than the ball bearing.

N and NU cylindrical roller bearings can only bear radial load, other types of radial bearings can not only bear radial load, but also can bear the axial load.

2, bearing the axial load

The main bearing of the axial load is generally thrust bearing, its nominal contact corner a0>450. The thrust bearing and the thrust angular contact ball bearing can bear the axial force of one or two directions at the same time according to the structure. When subjected to stress is very high and the cylindrical roller thrust bearing and thrust roller bearings.

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

3, bearing its own length compensation

Supporting a shaft and a bearing are usually combined with a fixed bearing and a moving bearing. Length error and thermal expansion of the compensation axis of INA bearing.

NU type and N type cylindrical roller bearings are ideal for swimming, which can compensate for the length of the bearings. Bearing inner and outer ring can be tightly matched.

4, the length of the sliding fit compensation

Non separable bearing can also be used as a swimming bearing. One of these two rings of the bearings with no axial fixed surface. Therefore, a movable ring bearing on its supporting surface.

After determining the size and type of the precision bearing, the design of bearing is considered.

Considering the bearing fatigue life, rigidity, heat and other factors, bearing clearance is the most appropriate choice (pre load).

Due to the bearing clearance and preload, on the ina bearing performance is the key, the high-speed operation is the key, so must be carefully considered. Selection is not at that time, there will be a problem of early damage or sintering. It is necessary to take from fourth steps to third steps, or from fourth steps to second steps.

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

The installation of high precision bearing shaft and bearing accuracy, tolerance, fixed the required locking nut tightening force, confirmation of the actual installation after the INA Bearing pre load and internal clearance.


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