RKB Recommendations for Mounting TQO Bearings and BEP Readjustment Poster - RKB Europe - #1
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MOUNTING AND BENCH END PLAY (B.E.P.) READJUSTMENT RECOMMENDATIONS
FOR RKB TQO/TQOS BEARINGS
BEARING INDUSTRIES
PERMISSIBLE DIMENSIONAL DEVIATIONS FOR ROLL NECK (TOO METRIC SERIES)
|
CUP AND CHOCK |
DOUBLE CONE AND SHAFT |
||||
|
Bearing nominal O.D. Over Incl. |
Single plane mean bearing O.D. deviation Upper Lower |
Chock bore diameter deviation Upper Lower |
Bearing nominal bore diameter Over Incl. |
Single plane mean bearing bore diameter deviation Upper Lower |
Shaft diameter deviation Upper Lower |
|
mm |
mm |
mm |
mm |
mm |
mm |
|
315 500 500 800 800 1250 1250 1600 |
0 - 0,045 0 - 0,075 0 -0,125 0 -0,160 |
+ 0,110 +0,050 + 0,100 +0,075 + 0,150 +0,100 + 0,215 +0,125 |
180 250 250 315 315 500 500 800 800 1250 |
0 - 0,030 0 - 0,035 0 - 0,045 0 - 0,075 0 -0,125 |
-0,175 -0,200 -0,210 -0,250 - 0,240 - 0,300 - 0,250 - 0,400 - 0,350 - 0,500 |
RECOMMENDATIONS:
1. All deviations of form and position, especially the roundness, do not have to exceed half of the above stated tolerances.
2. The above stated tolerances represent recommended values but, according to the specific installation conditions and designer's decision, other
values may be used.
PERMISSIBLE DIMENSIONAL DEVIATIONS FOR ROLL NECK (TQO INCH SERIES)
|
CUP AND CHOCK |
DOUBLE CONE AND SHAFT |
||||
|
Bearing nominal O.D. Over Incl. |
Single plane mean bearing O.D. deviation Upper Lower |
Chock bore diameter deviation Upper Lower |
Bearing nominal bore diameter Over Incl. |
Single plane mean bearing bore diameter deviation Upper Lower |
Shaft diameter deviation Upper Lower |
|
mm |
mm |
mm |
mm |
mm |
mm |
|
304,8 609,6 609,6 914,4 914,4 1219,2 1219,2 1524,0 |
+ 0,051 0 + 0,076 0 + 0,102 0 + 0,127 0 |
+ 0,150 +0,100 + 0,225 +0,150 + 0,300 + 0,200 + 0,375 + 0,250 |
101,6 266,7 266,7 304,8 304,8 609,6 609,6 914,4 914,4 1219,2 |
+ 0,025 0 + 0,025 0 + 0,051 0 + 0,076 0 + 0,102 0 |
-0,150 -0,175 -0,175 -0,200 - 0,200 - 0,250 - 0,250 - 0,325 - 0,300 - 0,400 |
RECOMMENDATIONS:
1. All deviations of form and position, especially the roundness, do not have to exceed half of the above stated tolerances.
2. The above stated tolerances represent recommended values but, according to the specific installation conditions and designer's decision, other
values may be used.
The chock bore diameter has to be measured in four equally spaced planes normal to the bore axis of symmetry (a, b, c, d) and in each plane in
four directions offset at 45° (1, 2, 3, 4). These measurements have to be properly recorded.
The shaft diameter has to be measured in four planes (or three, according to the neck shape) normal to the shaft axis of symmetry (a, b, c, d) and in
each plane in four directions offset at 45° (1, 2, 3, 4). These measurements have to be properly recorded.
Load: about 50% of bearing weight
B-B
D-D
Level
supports
RECOMMENDATIONS FOR BENCH END PLAY (B.E.P.) READJUSTMENT OF RKB TQO/TQOS BEARINGS
After dismounting the TQO/TQOS bearing for inspection or maintenance operations, the actual Bench End Play (B.E.P.), or axial clearance, has to be determined following the instructions
supplied below. Measurements should be performed with instruments having precision of at least 0.01 mm and in a room where temperature is constantly kept at around 20 °C to avoid
dimensional changes.
• Place the single cup DE on level supports and place consecutively and in the correct order all the bearing components except for the spacers.
• Load the bearing with an appropriate weight (about 50% of bearing weight) through the single cup AB.
• Measure the gaps B-B, C-C, and D-D at four different points each and get the mean values.
• To obtain more precise results, it is highly recommend to arrange the bearing components in the reverse order (starting with the single cup AB) and perform a second set of measurements.
• Get the mean values of the gaps B-B, C-C, and D-D.
• Measure the width of the cup spacers (BB and DD) and cone spacer (CC) at four different points each and get the mean values.
• Using these measurements, determine the actual value of the bearing B.E.P.
• If the B.E.P. exceeds the limits imposed by the manufacturer, regrind the bearing spacers in order to obtain the requisite B.E.P.
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