Recommended fits:
Household appliances, small motors, the use of disk spring preload on the bearings NTN. Disc spring deformation properties and bearing preload size tolerances inner and outer rings, will be on the appliance motor noise impact.
The role of preload
Preload bearing by means before loading, by changing the relative position of inner and outer rings, the bearing clearance in use. For household appliances bearing preload main role is to improve the bearing stiffness, vibration and noise suppression.
NACHI bearing preload on the effects of noise
Bearing under radial load, due to the presence radial clearance, only part of the ball bear the load (figure ABC), called the bearing area, the other is called non-bearing area. In the ball bearing zone from the non-D motion to D 'in the process, the ball weight and the centrifugal force of the magnitude and direction changing, alternating balls collide with the inner and outer ring raceways, so that different sounds generated within the bearing. This different sound can be eliminated on the bearing preload.
However, the Ambassador of SKF bearings preload friction increases, the temperature rises, the bearing life is reduced noise. So select the appropriate preload is very important.
NSK commonly used dust cover and seal lubrication
NSK common dust cover and seal structure as shown below. Cover (ZZ) is made by a steel stamping, seals made ??of sheet steel covered with rubber. Wherein the ring is divided into non-contact type (VV) and the contact type (DDU, DDW) two kinds. Various dust cover and seal performance comparison below.
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