If there is not enough lubricant or the lubricant viscosity is not correct, vibration will increase (” metal hard sound “noise), pressure at the contact point will increase, material fatigue will increase, and raceway damage, especially axial overload of bearings, will lead to faster material fatigue.

Radial ball bearings have radial bearing clearance because of the way they are manufactured and operated, and if the radial clearance caused by elastic axial preloading on the outer ring or inner ring is compressed to zero, the bearing ball will not transfer radial force optimally.

In this case, the bearing installation fit and assembly quality plays an important role, at a certain speed of rotation, the ball actually moves synchronously, rather than in a circular or wavy path. Occur from induction axial vibration in the bearing bracket, it is called the noise noise in the bearing, we will meet the main produce elastic force of the movement, and the elastic force will cause vibration and vibration movement of the force, displacement and force incentives which implies, when the situation is so in theory to analyze the individual must consider both at the same time.

When it comes to gears, there are two main causes of vibration:

The first is that the gear does not reach the precise grade caused by tangential or radial vibration;

The second is that the instantaneous gear ratio will change as the radius ratio changes as the teeth roll against each other.

For large gears with many teeth, power transfer usually involves multiple teeth, and the variation between radii is uniform as long as there is sufficient clearance and elasticity, as in helical gears. Small motors have smaller gears, fewer teeth, fewer teeth meshing (overlapping), and less meshing through helical gears.

As a result, even the small radius than fluctuations will make its become apparent, this will stimulate the rotation of the shaft vibration and bearing the radial vibration, the vibration is equal to the product of rotating frequency and number of teeth and its multiples, occasionally these vibrations by rotating frequency or its multiple modulation, such as when the plastic gears warp and loose.

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