Special Issue; Products for Industrial Machinery - NTN

NTN TECHNICAL REVIEW No.742006
Fig. 7. Regardless of the spindle attitude, the
temperature increase profiles are virtually same, so
the author’s bearing arrangement can be used for
practical applications in both vertical and horizontal
arrangements.
Table 1 Test condition
Support bearing
Jacket cooling
on the motor section
Test bearing
Contact angle
Preload system
Initial preload
Spindle attitude
Lubricating oil/cooling oil
Rate of oil feed to bearing
Jacket cooling
Jacket cooling oil temperature
Bearing ring material
Rolling element material
Cage material
ID 70 x OD 110 x 20 mm width
20˚
Definite position preloading
0150 N
Vertical, horizontal
ISO VG1.5
0.81.53.0 Lmin
Only for the motor section
20˚C
Special cemented steel
Ceramic Si3N4
Phenol resin
Test bearing
lubricated
by MQCJ
Fig. 3 Schematic construction of test spindle
Outer ring temperature increase ˚C
60
50
40
30
20
10
3.0L/min
1.5L/min
0.8L/min
Initial preload: 0 N
0
15 20 25 30 35 40 45
Running speed10 3 min -1
200 300
dmn value10 4
400
Fig. 4 Affect of amount of lubricant on outer race temperature
Power loss kW
10
8
6
4
2
3.0L/min
1.5L/min
0.8L/min
Initial preload: 0 N
0
15 20 25 30 35 40 45
Running speed10 3 min -1
200 300
dmn value10 4
400
Fig. 5 Affect of amount of lubricant on power loss
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