Optional introduce the basic elements of INA rolling bearings
When making a new spindle design, before choosing INA bearings, spindle performance parameters to consider, roughly determine the most critical performance, re-entering further exploration dollars. (Comprising: a spindle speed, precision spindle, spindle rigidity spindle life, heat spindle, spindle reliability)
After determining the parameters of the spindle, spindle probe gauge the actual size (shaft diameter, length, bearing span).
According bearing forms (balls or cylindrical roller bearings), with the column (with columns), drive (belts, gears, motors, built motor), lubrication (grease, oil and gas, oil mist, spray) and other spindle parameter settings to determine its structure.
1, bearing radial load
The main radial load of INA bearings radial bearings. These bearings nominal contact angle a0 <= 450. Foot of rain over the same roller bearing radial ball bearings can withstand greater loads.
N type and NU type cylindrical roller bearings can bear radial load, other types of radial bearings can bear radial load, but also can withstand axial load.
2, the axial load bearing
The main axial load bearing general thrust bearings, its nominal contact corner a0> 450. Thrust bearing and thrust angular contact ball bearings can withstand axial force one or both directions depending on the structure. When subjected to a force is particularly high when the preferred roller bearings and spherical thrust cylindrical roller bearings with thrust.
Thrust spherical roller bearings and one-way thrust angular contact ball bearings can withstand axial and radial loads simultaneously, the other thrust bearings can withstand axial load.
3, bearing their length compensation
A shaft and bearing support structure usually fixed bearing and swimming bearing combinations. Length error and thermal expansion compensation swimming INA Bearing shaft.
NU-type and N-type cylindrical roller bearings are ideal for swimming bearings that their length can be compensated. Bearing inner and outer rings can be a tight fit.
4, sliding fit length compensation
But also for non-separable bearings swimming bearings. Such a bearing used in the two rings, and without axial fixing surface. Therefore, the bearing rings can be a surface which supports activities.
After determining the precise bearing size, type, consider the specific design of the bearing.
Fully consider the bearing fatigue life, stiffness, fever and other factors, select the most appropriate bearing clearance (preload).
As the bearing clearance and preload on the most critical performance INA bearings, seemed more critical when the more high-speed operation, it must be carefully considered. Choose not the time, the early damage or sintering problems will occur. Necessary from step 4 to step 3 or step 4 to step 2, repeated consideration.
After determining the spindle structure design to be considered a necessary condition for the actual installation.
Mounting shaft and bearing precision high-precision bearings, tolerance, tightening force required tight mounting nut, bearing pre-load and internal clearance confirmation INA after the actual installation.