HM259049/HM259010CD
Specifications
Series | HM259000 |
Cone Part Number | HM259049 |
Cup Part Number | HM259010CD |
Design Units | Imperial |
Bearing Weight | 187.44 lb85.02 Kg |
Cage Type | Pin-Type |
Ab - Cage-Cone Frontface Clearance | 0.21 in5.3 mm |
Dimensions
d - Bore | 12.5000 in317.500 mm |
D - Cup Outer Diameter | 17.6250 in447.675 mm |
B - Cone Width | 3.3750 in85.725 mm |
C - Double Cup Width | 5.7500 in146.050 mm |
T - Bearing Width across Cones | 7.1249 in180.972 mm |
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius1 | 0.14 in3.600 mm |
r - Cup Frontface "To Clear" Radius2 | 0.06 in1.5 mm |
db - Cone Backface Backing Diameter | 13.43 in341.10 mm |
Da - Cup Frontface Backing Diameter | 16.87 in428.50 mm |
Aa - Cage-Cone Backface Clearance | 0.19 in4.8 mm |
Basic Load Ratings
C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 | 97800 lbf435000 N |
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 | 656000 lbf2920000 N |
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 | 170000 lbf757000 N |
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 | 56000 lbf249000 N |
Factors
K - Factor7 | 1.74 |
e - ISO Factor8 | 0.7 |
Y1 - ISO Factor9 | 0.961.43 |
Y2 - ISO Factor10 | 1.43 |
Cg - Geometry Factor11 | 0.186 |
Tapered roller bearings have tapered inner and outer ring raceways
as well as tapered rollers. They are designed to accommodate
combined loads, i.e. simultaneously acting radial and axial loads.
The projection lines of the raceways meet at a common point on the
bearing axis to provide a true rolling action and therefore low
frictional moments during operation. The axial load carrying
capacity of tapered roller bearings increases with increasing
contact angle α. The size of the contact angle, which is usually
between 10° and 30°, is related to the calculation factor : the
larger the value of e, the larger the contact angle.
Tapered roller bearings are uniquely designed to manage both thrust
and radial loads. Consisting of a "tapered cup" and a "tapered
cone", this design is one of the most basic and common styles in
the bearing industry. Found in everything from cars to conveyor
lines, tapered roller bearings are more versatile than any other
bearing series. Our taper bearings are sold in sets with both the
cup and the cone together.
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Bearing features
Low friction
The optimized roller end design and surface finish on the flange
promote lubricant film formation, resulting in lower friction. This
also reduces frictional heat and flange wear. In addition, the
bearings can better maintain preload and run at reduced noise
levels.
Long service life
The crowned raceway profiles of basic design bearings and the
logarithmic raceway profiles of Explorer bearings optimize
the load distribution along the contact surfaces, reduce stress
peaks at the roller ends , and reduce the sensitivity to
misalignment and shaft deflection compared with conventional
straight raceway profiles.
Enhanced operational reliability
Optimized surface finish on the contact surfaces of the rollers and
raceways supports the formation of a hydrodynamic lubricant film.
Consistency of roller profiles and sizes
The rollers incorporated in tapered roller bearings are
manufactured to such close dimensional and geometrical tolerances
that they are practically identical. This provides optimal load
distribution, reduces noise and vibration, and enables preload to
be set more accurately.
Rigid bearing application
A single row tapered roller bearing is typically adjusted against a
second tapered roller bearing. By applying a preload, a rigid
bearing application can be achieved.
Running-in period with reduced temperature peaks
Tapered roller bearings typically have a running-in period, during
which a conventional design tapered roller bearing experiences a
significant amount of friction, resulting in wear. This effect is
noticed as a temperature spike (diagram 1). With tapered roller
bearing designs, friction, frictional heat and wear are
significantly reduced, provided the bearings are mounted and
lubricated correctly.
Separable and interchangeable
Depending on the design, tapered roller bearings are separable and
components of same-sized bearings are fully interchangeable. For
example, single row tapered roller bearings are separable , i.e.
the inner ring with roller and cage assembly (cone) can be mounted
separately from the outer ring (cup). This facilitates mounting,
dismounting and also maintenance inspection routines.