How to check whether grease has deteriorated?
How to check whether grease has deteriorated?
PRODUCT
Household appliances - bearing knowledge coordination and preload bearings
by：Waxing
2020-06-08
The role of preloaded preloaded, refers to the bearing load before, through changing the relative position of inner and outer ring, make bearing clearance usage.
For household appliances bearing preloaded main role is to improve the bearing stiffness, vibration noise control.
Preloaded bearing noise impact bearing the radial load, due to the radial clearance, only part of the steel ball load (
Figure in the ABC)
, known as the bearing area, the other is called the bearing section.
In steel ball bearing the D motion from a to D ', in the process of steel ball size and direction of gravity and centrifugal force change constantly, steel ball collisions with inner and outer ring raceway alternately, thus bearing internal produce different sound.
This kind of different sound can be avoided through the bearing preloaded.
But a pretightening ambassador bearing friction increases, the temperature rise, the noise of the bearing life.
So is very important to choose suitable pre-tightening force.
NSK common dust cover and sealing ring structure as shown in the figure below.
Dust cover (
ZZ）
Made of steel sheet stamping, covered with rubber sealing ring by steel plate.
Among them, the sealing ring is divided into non-contact (
VV）
And contact (
DDU、DDW）
Two kinds.
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