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Part Number LM278848D, Tapered Roller Bearings - Double Tapered Cones - Imperial

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TDI bearings have a one-piece double inner race and two single outer races and are typically supplied complete with an outer race spacer as a pre-set assembly. The bearing can be used at fixed positions on rotation shaft applications. For rotating housing application it can be used to float on the stationary shaft.




Specifications  · Dimensions  · Abutment and Fillet Dimensions  · Basic Load Ratings  · Factors

Specifications

Series
LM278800

Cone Part Number
LM278848D

Design Units
Imperial

Cage Type
Pin-Type

C1 - Dynamic Radial Rating (1 million revolutions)1
740000 lbf
3290000 N

C0 - Static Radial Rating
1860000 lbf
8280000 N

Note
This part has a non-standard shoulder design. Please email customer CAD for shoulder details to ensure the proper design of mating components.
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.


Dimensions

d - Cone Bore
23.0625 in
585.788 mm

B - Double Cone Width
9.0625 in
230.188 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.25 in
6.4 mm

da - Cone Frontface Backing Diameter
24.25 in
616 mm

Ab - Cage-Cone Frontface Clearance
0.31 in
7.9 mm
1 These maximum fillet radii will be cleared by the bearing corners.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
192000 lbf
853000 N

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2
1290000 lbf
5730000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3
334000 lbf
1490000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)4
109000 lbf
486000 N
1 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
2 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.
4 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.


Factors

K - Factor1
1.76

G1 - Heat Generation Factor (Roller-Raceway)
11600

G2 - Heat Generation Factor (Rib-Roller End)
784

Cg - Geometry Factor2
0.291
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 Geometry constant for Lubrication Life Adjustment Factor a3l.



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