Split Cylindrical Roller Bearings For Rolling Mill Drive Shafts

Split Cylindrical Roller Bearings
For Rolling Mill Drive Shafts
Bearings
The work rolls of large four-high rolling stands are driven
via universal joint drive shafts (Figure 1). After every
rolling cycle the height of the rolls is adjusted.
The drive shafts must follow the adjusting movement.
Therefore they have universal joints. Due to the height
adjustment, the shaft length varies as well, which has
to be compensated in a coupling sleeve.
The universal joint shafts are generally very long to
ensure that the deflection angles do not become too
large. Because of the high torques which have to be
transmitted they are strong and heavy.
The split bearing design is necessary as the flanges
forged to the universal joint shaft are considerably
larger than the shaft diameter at the bearing seats.
In the past few years, several rolling mills were already
successfully converted from sliding bearings to rolling
bearings.
This has reduced the maintenance expenditure and,
in particular, grease consumption siginificantly.
In larger rolling mills, the weight of universal joint
shafts is supported in split single or double row
cylindrical roller bearings in order to relieve the joints
and couplings from the weight. Changes in the position
of the universal joint shafts are compensated in the
housing suspensions.
Rolling bearings
Figure 1: Bearings supporting the heavy universal joint drive shafts of large rolling stands
1
Bearing designs · Load limit · Lubrication · Bearing programme
Bearing designs
The split cylindrical roller bearings for the locating and
floating bearing positions have one or two roller rows
(Figure 2).
The bearing outer rings, inner rings and rollers are
made of casehardening steel. This makes the bearings
more insensitive to vibration and axial shock loads
occurring in operation.
Inner rings, outer rings and cages are split.
The split inner rings are located on the shaft by locking
rings.
Locating bearing
Floating bearing
Figure 2: Split single and double row FAG cylindrical roller bearings for drive shafts
Load limit
The load ratings of the split cylindrical roller bearings are
listed in the bearing tables (pp. 6, 7).
The load accommodated by split bearings must be
limited. A load limit of P/C r ⱕ 0,2 should be observed.
Axial loads are supported by the cylindrical roller
bearings’ lips.
Experience shows that the axial load F a amounts to
10...20 % of the radial load F r. These axial loads are
supported reliably. If higher axial loads are expected to
occur, please send us an enquiry – indicating the load
and speed – to have the lips’ load carrying capacity
checked.
Lubrication
Split cylindrical roller bearings are lubricated with grease
or oil mist.
Grease-lubricated split cylindrical roller bearings should
be relubricated once per shift. For this purpose the
2
bearings have a circumferential groove and lubricating
holes in the outer ring.
Replenishment quantities required for specific applications will be indicated on enquiry.
We recommend to use KP2K grease to DIN 51502 for high
pressure loads or the FAG Arcanol rolling bearing greases
LOAD220 (a grease for high loads), or LOAD400 (a grease
for high loads and shock loads).
On mounting, the cavities of the cylindrical roller bearing
and the lateral spaces in the housing should be packed
with grease to capacity.
Bearing programme
The bearing tables show a selection of split cylindrical
roller bearings for drive shafts. If other designs are
required, please send us an enquiry. The bearings are
produced on order.
Delivery periods for split cylindrical roller bearings will
be indicated on enquiry.
Fits · Shaft and housing tolerances
Fits
After tightening the screws of the locking rings, a gap of
0,3 to 0,4 mm (Figure 3) will be obtained at the joints.
This produces a tight fit of the bearing inner ring on the
shaft. The housing bore should be machined to H6 or H7.
Shaft diameter and bearing bore should fit as closely as
possible. If a shaft diameter is too large, it will not fit
well (Figure 3). We recommend to machine the shaft to
tolerance g6 or h6 to obtain a probable fit clearance of a
few microns.
Shaft tolerances
Nominal shaft diameter in mm
over
up to
180
250
250
315
315
400
400
500
500
630
630
800
800
1000
–18
–54
0
–36
–20
–60
0
–40
–22
–66
0
–44
–24
–74
0
–50
–26
–82
0
–56
315
400
400
500
500
630
630
800
800
1000
+36
0
+57
0
+40
0
+63
0
+44
0
+70
0
+50
0
+80
0
+56
0
+90
0
Shaft tolerances in microns
g6
h6
–15
–44
0
–29
–17
–49
0
–32
Housing bore tolerances
Nominal housing bore diameter in mm
over
up to
180
250
250
315
Housing tolerances in microns
H6
H7
+29
0
+49
0
+32
0
+52
0
inner ring
0,3 ... 0,4 mm
shaft
Figure 3: Inner ring fit on the shaft
3
Split cylindrical roller bearings
single and double row
C
C
B
B
d
D
d
Design 1
D
Design 1L
Split cylindrical roller bearings, d = 279,4 – 580 mm
Designation 1)
Z-533705.ZL
Z-541234.ZL
Z-577892.ZL
Z-572885.ZL
Z-572886.ZL
Z-581006.ZL
Z-579574.ZL
Z-538563.ZL
Z-527397.01.ZL
F-807475.ZL
F-804678.ZL
Z-577893.ZL
Z-545148.ZL
Z-548795.ZL
Z-563458.ZL
Z-580869.ZL
F-807125.ZL
F-801807.ZL
F-804627.ZL
1)
4
Design
1
2
2
1L
1L
2
1
2
1
1
1
2
2
2
2
1
2
2
1
Mass
Dimensions
m
kg
d
mm
D
mm
B
mm
C
mm
Load rating
dyn.
stat.
Cr
C or
kN
kN
112
111
90
190
194
334
224
213
200
89
109
235
337
239
255
96
459
490
214
279,4
350
360
400
400
440
440
450
460
480
500
500
500
553
553
560
560
580
580
430
470
460
615,95
615,95
600
666,75
600
650
600
635
635
680
700
710
680
730
750
750
203,4
240
225
200
200
420
200
275
260
160
155
310
332
260
260
142
460
515
257,5
110
170
164
115,9
115,9
310
115,9
200
120
75
73
228
220
184
184
72
350
305
172
1
1
1
2
2
3
2
2
2
1
1
2
3
2
2
1
3
3
1
The bearing design may vary from the above picture – an offer drawing will be provided on request.
460
900
160
080
080
100
200
850
360
060
290
240
200
750
750
250
750
000
730
2
4
2
3
3
7
4
7
4
2
2
5
8
8
8
3
10
7
3
600
750
900
750
750
800
150
650
800
500
900
850
150
150
150
200
000
800
900
Split cylindrical roller bearings
single and double row
C
C
B
B
d
d
D
Design 2
D
Design 2L
Split cylindrical roller bearings, d = 600 – 820 mm
Designation 1)
Z-577936.ZL
F-804300.ZL
Z-567618.ZL
Z-572298.ZL
Z-581300.ZL
Z-526783.02.ZL
Z-549642.ZL
Z-568614.ZL
Z-574879.ZL
F-568018.ZL
Z-573047.ZL
Z-573048.ZL
F-809831.ZL
F-809832.ZL
F-585320.ZL
Z-526784.01.ZL
Z-577902.ZL
F-809613.ZL
F-576544.ZL
Z-578276.ZL
F-580174.ZL
F-801623.01.ZL
F-809722.ZL
F-801572.ZL
1)
Design
2
2
1
1L
2
1L
1
1
2
2L
1
1L
1
1L
2
1L
2
2
2
2
2
1
2
2
Mass
Dimensions
m
kg
d
mm
D
mm
B
mm
C
mm
Load rating
dyn.
stat.
Cr
C or
kN
kN
432
307
200
202
425
200
190
209
426
508
694
669
730
709
538
203
531
447
496
551
626
220
470
552
600
600
610
610
610
630
630
640
640
650
650
650
650
650
670
690
690
710
710
750
750
775
775
820
775
735
775
775
780
794
794
805
805
840
940
940
980
980
864
864
864
880
890
920
960
945
945
990
380
380
190
190
380
190
190
190
380
390
320
320
320
320
390
196
390
380
370
400
380
165
330
380
278
278
88
100
290
88
88
88
290
300
200
200
200
200
300
94
284
290
280
300
290
80
245
290
3
3
1
1
3
1
1
1
3
4
5
5
5
5
4
2
3
3
4
3
4
1
3
4
250
000
900
900
250
900
900
960
750
400
600
600
600
600
450
240
550
900
150
900
500
830
150
300
9
8
4
4
9
4
4
4
11
11
11
11
10
10
11
5
10
11
11
12
11
4
9
14
000
800
500
500
000
650
650
650
000
800
800
800
400
400
900
400
200
400
600
000
800
550
200
000
The bearing design may vary from the above picture – an offer drawing will be provided on request.
5
MATNR 035028777-0000 / TPI 157 / 01 / GB-D / 2012021 / Printed in Germany by kraus
Schaeffler Technologies
AG & Co. KG
Georg-Schäfer-Straße 30
97421 Schweinfurt
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© Schaeffler Technologies AG & Co. KG
Issued: 2012, February
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TPI 157 GB-D