The coordination of high-speed bearing

high-speed bearings with clearance due to the requirements of the high speed for both high precision bearings  and  high temperature bearing, so in consideration of its coordination and clearance, to take into account the following two points:

(1) changes in the size and hardness changes when the temperature rose from     ambient temperature;
(2) force line change and shape change under high-speed centrifugal force caused by.

In short, in the high precision ball bearings and high temperature conditions, and with clearance from the selection of want to keep a bearing on the accuracy and performance, this is difficult.

In order to ensure the bearing after installation of the rolling deformation is small, the amount of interference can not KOYO 7319AC angular contact ball bearing interference fit get too large, and high speed centrifugal force and high temperature thermal expansion, or set off with the normal surface pressure.

Or relax the mating surface , so the amount of interference must considering the above two kind of factors under the carefully calculated, the effective amount of interference may be invalid for the high-speed bearing in the normal speed.

Thrust ball bearing noise judgment for maintenance checks

   In order to determine whether the removed bearing can be reused to wash clean after the thrust ball bearing checking. Carefully check the raceway, rolling surface, with the surface state of cage wear, increasing the bearing clearance and the presence or absence of injury on the dimensional accuracy of the decline, abnormal. Non-isolated type of small ball bearings, the inner ring with one hand support level, rotate the outer ring to confirm whether smooth.
   Tapered roller bearings and other separation-shaped high precision ball bearings, rolling elements can be, respectively, the outer ring raceway surface inspection.Large bearings because they can not rotate by hand, pay attention to check the rolling body raceway, cage, and other exterior wall surface, the importance of bearing the higher the more necessary to be careful inspection.
   Can be used to determine whether, considering the extent of damage thrust ball bearings, mechanical properties, the importance of operating conditions to be determined during the next overhaul. However, if the following defects can no longer use. Must manage new ones bearing.
   Bearing Manufacturing noise caused by factors although essentially due to a
manufacturing error, but in fact still with lubricant selection, installation conditions of the miniature ball bearings, shaft and housing accuracy states. This noise is divided into the cage and the sound of chatter sound categories, as described below:
   (1) cage sound and control with periodic vibration and noise, prone cage refers to violent vibration sound cage and rolling elements emitted shock and friction in the pocket loose big time. This noise occurs mainly in ball bearings and thrust ball bearings and stamping cage and solid cage will occur when using grease or oil lubrication occurs, but in poor lubrication or lubricant dried up, the radial clearance When the large, outer withstand torque loads, and poor cage structure and accuracy is not high, the more prone to severe cage webs or rivet head will suddenly break.
   The method of controlling noise and vibration cage there; use good lubrication performance lubricants; reduce installation errors bearings; compression bearing radial clearance or suitably axial preload, as well as the choice of having a reasonably good accuracy cage structure flanged ball bearing

, or switch to cage firmly and without worn bearings.
   (2) The sound and control chatter chatter sound is directly related to bearing rolling surface waviness related noise, which is a pure tone noise, for a constant speed, its frequency does not change, and for changing speed It also will change the frequency.