DODGE
B17-8
SELECTION
FEATURES/BENEFITS
PAGE B17-2
SPECIFICATION/HOW TO ORDER
PAGE B17-4
NOMENCLATURE
PAGE B17-5
SELECTION/DIMENSIONS
PAGE B17-10
Plummer Blocks
Sleeve Bearings
SLEEVOIL
Take-Up Frames
Engineering
Part Number Index
Keyword Index
Sleeve Bearings - SOLIDLUBE - Metric
Bearing Size
Select a bearing from tables for normal loads or loads in limited shaft movement applications
having a radial load equal to or greater than the actual load. This simple method is all that
is required for the majority of general machine applications using commercial steel shafting
and operating in a dry atmosphere. (For more favorable conditions, ratings may be increased
somewhat; consult factory). Shaft collars may be used for slight amounts of thrust. Generally the
rule of 10% of the radial load applies. Dirty environments will reduce bearing life and should be
avoided. Losses due to friction can be as high as 30% depending on speed, load, temperature
and shaft material.
Shafting
Commercial steel shafting is good in applications where temperatures do not exceed 370°C.
然而,对于扩展aring life, at any temperature, the shaft should be hardened to 35
Rockwell “C” or better. Shaft finish should be .25 to .50 micro-meters. A finish rougher than .50
will lessen bearing life. A finish smoother than R
a
. 25 micro-meters will not allow the optimum
lubricant film to develop. Shaft tolerance should be +.000/-.051 millimeters for commercial
steel shafting. If using other shaft materials, consult DODGE for the shaft tolerance and thermal
expansion.
When commercial shafting is exposed to a corrosive media, it will oxidize. A rusty shaft will grow
in the bearing, thus eliminating clearances. In this case stainless steel shafting may be used and/
or provide for regularly scheduled movement of shaft. In elevated temperatures stainless grades
such as 17-4, 15-5, or 13-8 are hardenable. Shafts can be spray coated with ceramic or hard
chrome. This is good up to about 425°C. Check with your supplier, since these coatings can flake
off when the coefficient of thermal expansion of the base material differs greatly from that of the
coating.
High grade specialty shafting may be used in excess of 537°C. It may be less expensive to use
sleeves of this material on more economical shafting.
Noise or High Pitched Squeal
Carbon-graphite bushings can develop a high frequency vibration in resonance with the operating
system to cause noise. Dampening or change of resonant frequency of the shaft is required to
eliminate noise.
Specials
SOLIDLUBE bearings or bearings made from alternate bushing materials such as polymers,
fibers, bronze, etc. for unusual operating and load conditions are available on a specially
engineered basis by supplying the following:
•
Shaft size, material and rpm.
•
Normal load, shock load and frequency.
•
Direction of load.
•
Ambient temperature and atmospheric conditions (water, dirt, corrosive, etc.)
•
Type of bearing: pillow block, flange bearing, etc.
•
Housing material desired.
• Quantity.
End Closures
Ball Bearing End Closures are available (Page B4-102).
Note: SOLIDLUBE bearings are not designed for rotating housing applications
Too
Cold
+370°C
Not
Applicable
Moisture
Tends to
Gum Up Brg.
Hot
Too
1000 Series
700 Series
-40°C
+120°C
+537°C
-40°C
-128°C
SOLIDLUBE
Bearing
Operating
Temperature