TIMKEN Bearing M278749DW - M278710

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.
Material: Bearing steels
In Stock:
Photo may not represent actual item. See the technical specification for details.

Specifications of TIMKEN Bearing M278749DW - M278710

TIMKEN Bearing M278749DW - M278710

Specifications

Series

M278700

Cone Part Number

M278749DW

Cup Part Number

M278710

Design Unit

Inch

Bearing Weight

3.4 lb1.5 Kg

Cage Material

Pin-Type

Dimensions

d – Bore

22.5000 in571.5 mm

D – Cup Outer Diameter

32 in812.8 mm

B – Double Cone Width

11.2500 in285.750 mm

C – Cup Width

4.7500 in120.650 mm

T – Bearing Width across Cups

11.2499 in285.747 mm

Abutment and Fillet Dimensions

R – Cone Backface “To Clear” Radius1

0.13 in3.3 mm

r – Cup Backface “To Clear” Radius2

0.250 in6.35 mm

da – Cone Frontface Backing Diameter

23.98 in609 mm

Db – Cup Backface Backing Diameter

29.76 in755.90 mm

Ab – Cage-Cone Frontface Clearance

0.34 in8.6 mm

Basic Load Ratings

C90 – Dynamic Radial Rating (One-Row, 90 million revolutions)3

264000 lbf1180000 N

C1 – Dynamic Radial Rating (Two-Row, 1 million revolutions)4

1770000 lbf7890000 N

C90(2) – Dynamic Radial Rating (Two-Row, 90 million revolutions)5

460000 lbf2050000 N

Ca90 – Dynamic Thrust Rating (90 million revolutions)6

150000 lbf669000 N

Factors

K – Factor7

1.76

e – ISO Factor8

0.33

Y1 – ISO Factor9

2.03

Y2 – ISO Factor10

3.02

G1 – Heat Generation Factor (Roller-Raceway)

12400

G2 – Heat Generation Factor (Rib-Roller End)

669

Cg – Geometry Factor11

0.299

Spacer

Note

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

Product description of TIMKEN Bearing M278749DW - M278710

TIMKEN Bearing M278749DW - M278710,Tapered Roller Bearings TDI (Tapered Double Inner) Imperial. Timken® tapered roller bearing assemblies are precisely designed to manage both radial and axial loads, even in the most unforgiving conditions.Double- or two-row Timken® tapered roller bearings feature double cups and two single cones. They are available in a variety of configurations for general industrial and automotive applications. And related type you may also like TIMKEN Bearing M282249D - M282210.

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.

TDI bearings are sometimes used on rotating shaft applications where a loose fit is required for ease of removal.

Size range:
ID 25.400 mm to 1200.150 mm (1.000 in. to 47.2500 in.)
OD 30.480 mm to 2460.000 mm (1.2000 in. to 96.8504 in.)

Design Attributes:
Double cone and two single cups, with or without a cup spacer.
Furnished as a matched assembly.
Cups ground to fit.

Applications:
Gear reduction units
Cranes
Calendar rolls
Industrial machinery

TIMKEN Bearing M278749DW - M278710,Tapered Roller Bearings TDI (Tapered Double Inner) Imperial. A tapered roller bearing includes a retainer formed with a plurality of trapezoidal pockets. Each pocket includes cutouts formed in the crossbars defining each pocket near the narrow end thereof. A tapered roller is received in each pocket with its small-diameter end facing the narrow end of the pocket. Lubricating oil flowing into the bearing space defined radially inwardly of the retainer can quickly flows through the cutouts into the bearing space defined radially outwardly of the retainer at the narrow end of each pocket. Thus, it is possible to reduce the amount of lubricating oil flowing along the raceway of the inner ring to the large-diameter flange, and thus reduce the amount of lubricating oil remaining in the bearing, thereby reducing the torque loss due to rotational resistance of the bearing resulting from lubricating oil remaining in the bearing.

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Literature & catalogs

TIMKEN -LUBRICATION
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TIMKEN -TYPE- TDI
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TIMKEN-TAPERED ROLLER BEARING CAGES
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TIMKEN-TYPE- TS
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