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Part Number 2878, Tapered Roller Bearings - Single Cones - Imperial

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This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.




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

Specifications

Series
2878

Cone Part Number
2878

Design Units
Imperial

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
28600 lbf
127000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
7420 lbf
33000 N
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
2 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.


Dimensions

d - Cone Bore
1 3/8 in
34.925 mm

B - Cone Width
0.9375 in
23.813 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.03 in
0.760 mm

da - Cone Frontface Backing Diameter
1.61 in
41 mm

db - Cone Backface Backing Diameter
1.65 in
42 mm

Ab - Cage-Cone Frontface Clearance
0.05 in
1.3 mm

Aa - Cage-Cone Backface Clearance
0 in
0 mm

a - Effective Center Location2
-0.22 in
-5.6 mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 Negative value indicates effective center inside cone backface.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
4260 lbf
19000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
16400 lbf
73200 N

C0 - Static Radial Rating
18800 lbf
83800 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
2690 lbf
12000 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.


Factors

K - Factor1
1.59

G1 - Heat Generation Factor (Roller-Raceway)
23.1

G2 - Heat Generation Factor (Rib-Roller End)
12.4

Cg - Geometry Factor2
0.0718
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.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances