NTN - Precision Rolling Bearings

NTN Main Spindle Bearings
Data 2
For 5S-HSFL type bearings, the temperature of the outer rings remains stable even with an air consumption as low
as 10 NR/min (50 to 25% of the recommended air consumption for standard bearings) at a speed of 21000 min -1 (dmn
2.610 6 ) (Fig. 9.30).
Temperature increase
of outer ring ˚C
80
70
60
HSFL type
HSF type
Test conditions
Test bearing
Shaft speed
Preload
Oil consumption
5S-2LA-HSFL020DB
5S-2LA-HSF020DB
(100150242 rows)
21000 min -1
2.5 kN(constant pressure preloading)
0.03 mL/shot
(oil shot intervals, 5 min)
50
0 10 20
30 40 50
Air consumptionNL/min
Fig. 9.30 Relationship between air consumption
and temperature increase
Data 3
The 5S-HSFL type bearings can operate at 21000 min -1 (dmn 2.610 6 ) with oil shot intervals of 21 min (reduction of
20 to 90% as compared with the recommended oil consumption for standard bearings) (Fig. 9.31).
Temperature increase of
outer ring ˚C
80
70
60
HSFL type
HSF type
50
0 5 10
15 20 25
Oil shot intervalsmin
Unstable
Fig. 9.31 Relationship between oil shot intervals
and temperature increase
Test conditions
Test bearing
Shaft speed
Preload
Oil consumption
Air consumption
5S-2LA-HSFL020DB
5S-2LA-HSF020DB
(100150242 rows)
21000 min -1
2.5 kN (constant pressure preloading)
0.03 mL/shot
12.5 NL/min
Data 4
5S-HSL type bearings can reliably run at a speed of 19000 min -1 (fixed position preloading) (Fig. 9.32) with both
decrease air and oil consumption.
Temperature increase
of outer ring ˚C
65
55
45
35
HSL type
HSE type
Unstable
25
8000 10000 12000 14000 16000 18000 20000
Speedmin -1
1.0 1.5 2.0 2.5
dmn value 10 6
Fig. 9.32 High-speed test results
(fixed position preloading)
Test conditions
Test bearing
Shaft speed
Preload
Oil consumption
Air consumption
5S-2LA-HSL020DB
5S-2LA-HSE020DB
(100150242 rows)
1000019000 min -1
After assembly, 0 (fixed position preloading)
0.03 mL/shot
(oil shot intervals, 10 min)
10 NL/min (HSL)
30 NL/min (HSE)
77