By optimising the contact geometry between the
rolling elements and the ring raceways, Schaeffler's new 'Generation C'
deep groove ball bearings are ideal for electric motors, providing 35%
less friction and 50% less noise.
For designers of electric motors and for plant operators who use these
motors, efficiency, noise and vibration levels of the motor are key
design and quality criteria. The efficiency of small electric motors
with low capacity - the type often found in electrical consumer goods
such as washing machines, power tools and ventilators - is mostly
determined by the power loss of the internal bearings.
The Schaeffler Group has therefore developed the 'Generation C' range of
deep groove ball bearings, which not only offer 35 per cent less
friction than its predecessor, but also cut noise levels by 50 per cent.
This means a more efficient motor, resulting in reduced energy
consumption. The new design improvements mean that the bearings can
achieve higher running speeds (rpm), whilst simultaneously increasing
the life of the bearing.
The bearings are therefore ideal for applications in which low noise and
smooth running are critical. Reduced friction levels and improved
energy efficiency from the bearings means a reduction in running costs
for plant operators and a more efficient machine with extended
maintenance intervals.
In order to reduce friction by 35 per cent, Schaeffler optimised the
osculation (raceway curvature) between the balls and rings on the new
bearings. This means there is less chance of misalignment between the
inner and outer ring. As well as offering less friction, the bearings
also generate less heat, making them suitable for higher running speeds.
Schaeffler also modified the seal on the bearings. The new novel HRS
seal has modified double lip geometry and is made from nitrile butadiene
rubber. These have been adjusted to match the recess on the bearing
inner ring. Axial contact between the inner ring and the seal means more
effective protection against contamination or loss of grease and less
frictional torque. This results in longer grease life, increasing the
life and reliability of the bearing and provides improved bearing
performance at higher speeds (rpm).
Venting grooves have also been added in order to improve the run-in
behaviour of the bearings. In addition to the HRS seal, the bearing
shield has been modified. The recesses on the bearing rings and the
shield geometry are functionally adjusted to each other in such a way
that the sealing efficiency is improved and grease life increased. The
new design creates an axial and radial labyrinth with the shield.
The improved guidance of the rolling elements also contributes to higher
performance of the bearing. The new riveted steel cage, which replaces
the previous steel 'ribbon' cage, offers higher rigidity and so is
suitable for higher running speeds. The riveted steel cage also reduces
noise levels and means the bearing is less sensitive to shock loads. The
manufacturing tolerance of the bearings has also been increased (to P5
Abec 5 standards), ball roundness to G5 tolerances and improved surface
finish.
The dimensions of the new bearings correspond to the previous bearing
types, enabling easy replacement. Generation C bearings can operate in
temperatures from -30°C up to +120°C.
The bearings are available with outside diameters from 26mm up to 90mm.
Riveted steel cages are standard, although polyamide cages are optional.
P6 or P5 tolerances can be specified on ordering. Sealing options
include one or two gap seals; one or two lip seals; or low friction,
non-contact labyrinth seals.
From: http://news.thomasnet.com/fullstory/Deep-Groove-Ball-Bearings-reduce-noise-in-electric-motors-561078
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