Timken - Ball Bearing Housed Units

BALL BEARING HOUSED UNITS
BALL BEARING HOUSED UNITS • INTRODUCTION
INTRODUCTION
Ball bearing housed units are available in a wide variety of types and
sizes to accommodate a complete range of operating conditions.
These units generally have cast-iron housings and mount on
straight shafts with a slip fit. The self-locking collar and the set
screw inner-bearing designs make mounting easier. Many of
the set screw units include Shaft Guarding Technology (see
page A-31). Bolt holes in housings take standard bolts to attach
units to machinery frames. Several series are available with the
concentric locking collar. Most units have a self-aligning feature.
Units incorporating prelubricated wide-inner-ring ball bearings
may be furnished without grease fittings.
Several basic types of housed units are available:
• Pillow blocks also known as housed units.
• Flanged cartridges.
• Flangette units.
• Cylindrical cartridges.
• Take-up units.
The choice is determined by application and mounting requirements.
Within the basic type selected, variations are available for specific
load factors, shaft sizes, mounting surface dimensions, base-toshaft
centerline heights and lubrication requirements.
PILLOW BLOCKS
Pillow blocks, the most commonly used type of mounted units,
provide shaft support where the mounting surface is parallel to
the shaft axis (fig. A-20). The bolt holes are usually slotted for
easy adjustment during mounting.
Pillow blocks come in a variety of configurations.
• Narrow series (V and S) are lightweight, yet structurally
designed to support bearing load.
• Premium width series (R and Y) are three times stronger
for rougher environments. They’re available in two
styles that fit typical applications.
• Pressed steel and rubber pillow blocks are available for
light-duty applications.
FLANGED CARTRIDGES
Flanged car tridges are used
where a shaft passes through the
machine frame at a right angle
(fig. A-21). A four-bolt mounting is
the most common; however, where
the mounting area is restricted,
three- and two-bolt versions
are available. A piloted flanged
cartridge provides additional
mounting accuracy and support.
Flanged cartridges are supplied in both standard and heavy-duty
series. Iron- and rubber-flanged cartridges also are available.
A complete line of flangette units or pressed-steel flanged
cartridges provides an economical solution for light-duty
applications. Two-, three- and four-bolt mountings are available
along with a relubricatable version.
CYLINDRICAL CARTRIDGES
Cylindrical cartridges, like flanged cartridges, provide shaft
support where the shaft axis is perpendicular to and passing
through a machined housing that is generally very thick (fig. A-22).
The outside diameter of the cylindrical cartridges permits
mounting with a press fit into a straight, through-bored housing.
Cylindrical cartridges have a machined spherical bearing seat
to provide initial shaft alignment in standard-duty applications.
Synthetic, conductive rubber cylindrical cartridges are available
for applications where low-cost, light-duty, low-noise operation
is essential.
Fig. A-22. Cylindrical cartridge.
Fig. A-21. Flanged cartridge.
Fig. 23. Take-up unit.
TAKE-UP UNITS
Take-up units are used where shaft adjustment and belt-tightening
devices are required, such as conveyor applications (fig. A-23).
Frames for take-up units provide for either side or top mounting.
Fig. A-20. Pillow block.
Take-up units are available in cast-iron for standard-duty
applications and pressed steel for economical, light-duty
applications.
A-66 TIMKEN ® HOUSED UNIT CATALOG • Download 3D Models and 2D Drawings at cad.timken.com