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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TDI (Tapered Double Inner) > Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial > Part Number LM278848D - LM278810  
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Part Number LM278848D - LM278810, Tapered Roller Bearings - TDI (Tapered Double Inner) Imperial



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.



Unit of Measure: Imperial Metric Both

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

Specifications

Series

LM278800

Cone Part Number

LM278848D

Cup Part Number

LM278810

Design Unit

Inch

Cage Material

Pin-Type

Note

This part has a non-standard shoulder design. Please email customer CAD for shoulder details to ensure the proper design of mating components.

Related Assembly Number(s)

LM278848D-902A2
LM278848D-902A4


Dimensions

d - Bore

23.0625 in
585.788
mm

D - Cup Outer Diameter

30.3750 in
771.525
mm

B - Double Cone Width

9.0625 in
230.188
mm

C - Cup Width

3.8125 in
96.838
mm

T - Bearing Width across Cups

9.0624 in
230.185
mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1

0.25 in
6.4
mm

r - Cup Backface "To Clear" Radius2

0.250 in
6.35
mm

da - Cone Frontface Backing Diameter

24.25 in
616
mm

Db - Cup Backface Backing Diameter

28.58 in
725.93
mm

Ab - Cage-Cone Frontface Clearance

0.31 in
7.9
mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 These maximum fillet radii will be cleared by the bearing corners.


Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 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

e - ISO Factor2

0.33

Y1 - ISO Factor3

2.03

Y2 - ISO Factor4

3.02

G1 - Heat Generation Factor (Roller-Raceway)

11600

G2 - Heat Generation Factor (Rib-Roller End)

784

Cg - Geometry Factor5

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


Spacer

Note

Spacer shows standard nominal .01 radii, actual bearing may vary


 MORE IMAGES 

·  Timken_TRB_2ROWASSY_TDI_39585D-90015-A

·  Timken_TRB_2ROWASSY_TDI_39585D-90015-A3

·  Timken_TRB_2ROWASSY_TDI_39585D-90015-T2



 DOWNLOADS 

Bearing Life Calculation Tool

Bearing Dimensional Tolerances

Tools and Guides for Engineers

TRB TDI Line Drawing
(JPG, 14KB)


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