Timken - Saf Split-Block Housed Units

Timken ® SAF SPLIT-BLOCK HOUSED UNITS
SAF HOUSED UNIT INTRODUCTION • Design and Construction
SAF HOUSED UNIT INTRODUCTION
Timken’s capabilities in engineering and manufacturing
heavy-duty pillow blocks provide important user benefits. In
addition, Timken’s worldwide sales organization is staffed with
experienced engineers who are available for consultation on
any pillow block or bearing application. Our expert engineering
assistance also is available for applications involving shaft sizes
1016 mm (40 in.) and larger, such as BOF trunnions, bridge blocks
and ball mills. If your design calls for shaft sizes or loads not listed
in this catalog, contact your Timken engineer for information
about availability of special units.
• Sizes: 35-300 mm shafts (1 3 ⁄8 up to 11 7 ⁄8 in.). Special shaft
sizes up to 1000 mm (39 3 ⁄8 in.) and beyond.
• Applications: Conveyors, ball mills, casters, rolling mills,
heavy movable structures.
• Features: Split construction for convenient assembly
and disassembly. These units include pry tool slots and
the exclusive Pry-Lug fulcrum, which simplifies bearing
inspection, service and replacement.
• Benefits: Caps can be removed easily and quickly without
damage to the bearing or housing.
DESIGN AND CONSTRUCTION
Timken supplies pillow blocks equipped with either tapered
bore bearings with adapters for mounting on straight shafts or
cylindrical bore bearings for assembly on shouldered shafts.
Timken uses a system of doweling caps and bases together at
an early stage of manufacturing, so that they remain a single unit
during machining. They are not interchangeable as separate parts
and become precisely mated components, helping to ensure a
precise fit. Timken manufactures pillow blocks in two styles: SAF
and SDAF. The larger SDAF block is suggested for extreme-duty
applications.
Standard caps and bases are made from high-grade, stressrelieved
cast iron. They also are available in cast steel.
All Timken ® split pillow blocks are designed for four-bolt mounting.
Certain smaller sizes are normally furnished for two-bolt
mounting. These assemblies are indicated in the following tables
and can be ordered with an optional four-bolt base.
Four cap bolts are used
in most Timken pillow
b l o c k s i n o r d e r t o
equalize the pressure
between the cap and the
base, helping to prevent
lubricant loss.
The illustration below
shows all parts of a pillow
block assembly that are
described throughout
this section.
Fig. D-15.
Protects Bearing, Reduces Leaks
Precision triple-ring labyrinth seal
and extra-large oil return holes in the
housing protect the bearing
Runs Cooler for Longer Bearing Life
Timken ® spherical roller bearings, available with either a
steel or brass cage, feature optimized internal geometries
and improved lubrication distribution. These highperformance
bearings allow ±1.5 degree misalignment
Timken ® Spherical
Roller Bearing
Speed Up Conversion
from Fixed to Float Units
Removable stabilizing
ring saves time and
reduces inventory
Avoids Damage to Bearing and
Housing During Inspections
Pry-tool slots allow quick
and easy cap removal
Shields Bearing
Matched cap and base protect bearing
Fig. D-16. SAF housed unit components and features.
Lockwasher
Locknut
Tapered Ring
LER Seal Ring
TIMKEN ® HOUSED UNIT CATALOG D-47