BEARING HOUSINGS - CBC Bearings

9
INTERNAL SELF-ALIGNING BALL & ROLLER BEARING UNITS
5. Handling of bearings
“C” spanners should be used where possible
progressively tighten locknut whilst feeler gauge
readings are taken (similar to Step 2) to achieve
desired “residual clearance” (Step 3). Suggested
method is to select mid range feeler, in case of
example use . 140mm blade and tighten until slight
interference is felt. When approaching this condition
watch for locknut slot nearing alignment with a
lockwasher tab.
ÒCÓ spanner
Insert
spacer
rings
After double checking that
desired residual clearance
has been reached, tab should
be bent into slot.
8. The floating bearing should now be positioned
slightly off housing centre toward locknut side of sleeve
so that as nut is tightened, bearing will be displaced
approximately back to centre line. Tighten as per Step 7.
No spacer rings are used of course, and bearing
does not have to be on centre as long as adequate
float is available each side of bearing between
housing seat shoulders. Rotate assembly by hand and
ensure that there is no resistance.
Float
Float
9. Lubrication is normally a No. 2 penetration mineral oil/
lithium soap grease Shell Alvania No. 2 or equivalent.
Grease should be “worked” into bearing for as much
of circumference as possible rotating occasionally.
Basic grease capacity rule is that 1 /2— 1 /3 of housing
volumetric capacity be filled, this can be done by
hand prior to fitting cap which in many cases can
be “plugged” and only the taconite seals lubricated
via nipples on a regular basis. High temperature or
unusual applications may require a special grease
selection and should be referred to CBC Technical
Department.
SUITABLE LUBRICANTS:
Shell-Alvania R2, EP2
BP - Energrease LS2, LSEP2.
Mobil - Grease 77, Mobilux EP2
Ampol - RRs, EP Grease C2.
Caltex - Regal, Starfak, Premium 2.
10. Housing cap, after cleaning, can be assembled to
bodies (they are not interchangeable). Taconite seals
should be fitted and it may be necessary to adjust
housing base alignment to allow constant clearance
around circumference of rotating labyrinth and
193
during these procedures that rotation is free and not
impaired. Taconite seals should be lubricated until
grease extrudes fully around labyrinth circumference.
Do not “over grease” bearing housing as damage and
overheating can occur during initial running period. It
should be lubriucated and plugged as Step 9, or
lubricated with a known quantity of grease.
Note: These Steps show Mounting Procedures when fitting
Spherical Roller Bearing and Adapter Sleeve into CBC
Split Bearing Housing.
GENERAL NOTES
a) Check that the shaft diameter conforms to ISO Tolerance
h9, and IT5 for ovality.
b) Table values are for normal loads, solid shafts and bearing
internal clearance groups of ‘Normal’ and C3. For heavy
loads (Pr>0.15 Cr) Please Consult CBC.
c) After determining residual clearance in Step 3. Consult
column D in table as a double check that figure obtained
does not fall below min. permissable residual clearance.
d) In some applications it may not be possible to use feeler
gauges to serve as tightening guide, in these cases it is
often possible to measure “Axial Displacement” between
adapter sleeve and inner race of bearing during tightening
(See chart Column ‘C’). These values are for relative
movement between sleeve and bearing faces and can be
measured with tail end of standard vernier gauge or other
methods.
e) All joint faces are machined. Grease applied between faces
should be sufficient to act as a sealant. However, in
exposed locations we recommend jointing compound be
used, especially with ’A’ type (closed) covers.
f) As with all bearing assemblies, tools and work area should
be as clean as practicable.
Table 14. Standard Tolerance Values–
Spherical Roller Bearings –Tapered Bore
A B C D
BEARING BORE
DIAMETER
d
O VER. INCL.
30
40
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1000
40
50
65
80
100
120
140
160
180
200
225
250
280
315
355
400
450
500
560
630
710
800
900
1000
1120
DECREASE IN
RADIAL
INTERNAL
CLEARANCE
MIN
0.020
0.025
0.030
0.040
0.045
0.050
0.065
0.075
0.080
0.090
0.100
0.110
0.120
0.130
0.150
0.170
0.200
0.210
0.240
0.260
0.300
0.340
0.370
0.410
0.450
MAX
0.025
0.030
0.040
0.050
0.060
0.070
0.090
0.100
0.110
0.130
0.140
0.150
0.170
0.190
0.210
0.230
0.260
0.280
0.320
0.350
0.400
0.450
0.500
0.550
0.600
AXIAL
DISPLACEMENT
TAPER 1:12
MIN
0.35
0.40
0.45
0.60
0.70
0.75
1.10
1.20
1.30
1.40
1.60
1.70
1.90
2.00
2.40
2.60
3.10
3.30
3.70
4.00
4.60
5.30
5.70
6.30
6.80
MAX
0.40
0.45
0.60
0.75
0.90
1.10
1.40
1.60
1.70
2.00
2.20
2.40
2.70
3.00
3.30
3.60
4.00
4.40
5.00
5.40
6.20
7.00
7.80
8.50
9.00
UNIT mm
MIN. PERMISSIBLE
RESIDUAL
CLEARANCE
NORMAL
C3
0.015
0.020
0.025
0.025
0.035
0.050
0.055
0.055
0.060
0.070
0.080
0.090
0.100
0.110
0.120
0.130
0.130
0.160
0.170
0.200
0.210
0.230
0.270
0.300
0.320
0.025
0.030
0.035
0.040
0.050
0.065
0.080
0.090
0.100
0.100
0.120
0.130
0.140
0.150
0.170
0.190
0.200
0.230
0.250
0.290
0.310
0.350
0.390
0.430
0.480