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2 2 INSERT BALL BEARINGS

NTN Triple-sealed bearings for bearing units

DUSTPROOFING EFFECTIVENESS

1. Dustproofing performance test
An hourglass-shaped drum containing dust
(activated alumina) was rotated at 50rpm. Drum impeller
Test bearing Drum driving belt
The main shaft was then rotated at 1,750rpm
Test bed Main shaft driving belt
(dn value 51,000), while a load of 25kgf was
Reducer
applied to the test bearings mounted on both
sides of the drum. NTN recorded the bearings’
normal running time before seizure due to
internal dust contamination, and compared the
results. (Because the test was performed at room
temperature, the speed of the main shaft was set to
a much higher range than normally allowable for
triple-sealed bearings in order to simulate more
severe operating conditions.) Dustproofing performance test rig

M A N U F A C T U - R T E S T B E A N I R G C R O S S - S E C O I T N N . o O F A V E R A G E
S E A L T Y P E
E D E S C P I R O I T N O F B E A N I R G S A M P L E S R U N N I N G M I T E
N T N U C 6 0 2 D L 1 J L 3 h 0 1 5 5
l a e s - e l p i r T
C o m y n a p o t t n e l a v i u q E 6 h 9 5 9 1
A U C 6 0 2 D J L L 1 Note:
The dustproofing life of our tripled-sealed beaing
(UC206D1LLJ) is 2.8 times that of an equilalent
y r a n i d r O l a e s bearing from Company A, and is 5.6 times that of our
r e b b u r ( + l a e s ) r e g n i f N T N U C 6 0 2 D 1 6 h 6 8 9 conventional bearing with a standard seal (UC206D1).
RESISTANCE TO MUDDY WATER
Main shaft Test bearing Muddy water
1. Muddy water resistance test Drive pulley
Two hundred cubic centimeters of muddy water
(Kanto loam type 8; water content 1:10 w/w) was
poured into a cylindrical housing where the bearing
being tested was installed. The bearing and
propeller in front of the bearing was rotated at 500
rpm (dn value 20,000) by a drive belt, with a
vibration of 0.6 G applied to the housing. NTN
recorded the running time of the bearing before the
Housing Propellor
test equipment seized due to the contamination by
muddy water, and then compared the results. Muddy water resistance test rig

M A N U F A C T U - R T E S T B E A N I R G C R O S S - S E C O I T N A V E R A G E G I T H T E N I N G 2. Muddy water resistance
S E A L T Y P E
E D E S C P I R O I T N O F B E A N I R G R U N N I N G M I T E T O R Q U E test results and
N T N U C 8 0 2 D L 1 J L h 6 1 0 3 9 . 6 1 N c = m . h c n i - f b l 0 5 . 1 tightening torques

C o m y n a p o t t n e l a v i u q E h 1 5 8 . 8 1 N c = m . h c n i - f b l 6 6 . 1
A U 8 0 2 L E D J L L 1
l a e s - e l p i r T
C o m y n a p o t t n e l a v i u q E h 7 3 4 1 5 . 3 2 N c = m . h c n i - f b l 8 0 . 2
B U 8 0 2 L E D J L L 1
C o m y n a p o t t n e l a v i u q E h 4 7 7 8 . 8 5 N c = m . h c n i - f b l 0 2 . 5
C U 8 0 2 L E D J L L 1

Note:
N T N U C 8 0 2 D 1 h 3 1 5 4 . 4 N c = m . h c n i - f b l 9 3 . 0 The life of the muddy water waterproof
of our triple-sealed bearing (UC208D1LLJ)
y r a n i d r O l a e s
r e b b u r ( + l a e s C o m D y n a p U C 8 0 2 D 1 o t t n e l a v i u q E h 7 8 2 3 . 6 2 N c = m . h c n i - f b l 2 3 . 2 is 59 times that of an equivalent bearing
from Company A, twice of that of an
) r e g n i f
equivalent bearing from Company B, and
C o m y n a p o t t n e l a v i u q E h 0 4 7 . 4 1 N c = m . h c n i - f b l 0 3 . 1 5.9 times that of our conventional bearing
E A 8 0 2 L E D 1 standard seal (UC208D1).
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