part b cylindrical roller bearing cage design
DESCRIPTION
Part B Cylindrical Roller Bearing Cage Design. Cage Design. TVP = glass fiber reinforced nylon M = one piece, machined bronze finger or fully milled S = one piece stamped steel (5200 series & HJIR) Pin type. M. S. Pin type. Precision. Typical Precision Classes (Tolerance). - PowerPoint PPT PresentationTRANSCRIPT
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Part B Part B Cylindrical Roller Bearing Cylindrical Roller Bearing
Cage DesignCage Design
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 2
Cage Design TVP = glass fiber reinforced
nylon M = one piece, machined
bronze finger or fully milled S = one piece
stamped steel (5200 series & HJIR)
Pin type
S
Pin type
M
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PrecisionPrecision
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 4
ISO Class
ABMA Class Usual Symbol
Normal RBEC 1 No Symbol (PO)
6 RBEC 3 P6
5 RBEC 5 P5
4 RBEC 7 P4
2 RBEC 9 P2
Typical Precision Classes (Tolerance)
ISO 492 Section for metric roller bearings in increasing precision
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Application ConsiderationsApplication Considerations
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 6
Application Considerations
LubricationHeat generationSpeed/accelerationMisalignment
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 7
Lubrication Bearing features
– Lubrication grooves and holes in OD
– Face scallops / lube from bore (stationary inner / rotating outer)• Used in multi-row CRB’s
– Spiral bore groove• Improved disassembly on
roll necks
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 8
Torque & Heat Generation
Sources of bearing torque– Elastic deformation (roller-raceway contact)– Cage contact– Flange contact– Lubricant viscous forces
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 9
Heat Generation
By design, generate less heat due to minimal friction
– Bearing operating temperature must not exceed 250°F (121°C)
Heat will dissipate by oil flow and conduction/convection/radiation through housing material
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 10
Speed/Acceleration Considerations
High speeds and acceleration– Concern for large bore and eccentric
applications
Lower speeds with light loads– Skid smearing can occur due to lack of roller
traction– Min load = 2% of C1
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 11
Misalignment
Roller/race profiles– Standard roller/race profiling designed to
withstand 0.0005 in/in of misalignment (low to moderate loads)
– More complex profiles (MRD) can be used to help reduce edge stresses that develop beyond the defined drops
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 12
Misalignment
Flange modifications– Flanges can be heightened, tapered, or
include special profiles
Lubrication improvements– Increased oil flow rates to insure contact
points generate adequate lube film thickness
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Part NumberingPart Numbering
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 14
Cylindrical Roller Bearing (CRB) Part Numbering - Metric
PREFIXDIMENSION
SERIESCYLINDRICAL TYPE BEARING
BORE SIZE SUFFIX
N, NU, NF, NJ, NP, NUP, NJF, NN, NNU, NUP,
4NNU, HJ
(0)2, (0)3, (0)4, 10, 19, 22, 23, 29, 30, 49, 51, 57, 59
d = __ * 5 (mm) For d < 500mm
d = XXX (mm) For d >= 500mm
/XXX Designation
Cage Design
E.TVP, M, S
Cylindrical Roller Bearing Product Overview
5/7/2007 CRB Product Overview 15
Cylindrical Roller Bearing (CRB) Part NumberingCRB Configurations
– NJ = Cylindrical roller radial bearing (2 ribs on outer ring, 1 rib on inner ring)
– NU = Cylindrical roller radial bearing (2 ribs on outer ring, cylindrical inner ring)
– NUP = Cylindrical roller radial bearing (2 ribs on outer ring,1 fixed rib and 1 loose rib/flat washer on inner
ring)– RNU = Cylindrical roller radial bearing (2 ribs on outer ring,
without an inner ring) Series
– 10 = width series 1; diameter series 0 (dimension series 10– 2 = width series 0; diameter series 2 (dimension series 02)– 22 = width series 2; diameter series 2 (dimension series 22)– 3 = width series 0; diameter series 3 (dimension series 03)– 23 = width series 2; diameter series 3 (dimension series 23)
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Timken Cylindrical Roller Timken Cylindrical Roller Bearing Product Overview Bearing Product Overview Part BPart B
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