Page 348 - The Tribology Handbook

c13 Selection of lubrication svstems

Table 13.5 Selection bv type of component to be lubricated
System Rolling bearings Fluid film plain bearings Rubbing plain bearings
Gears
Non-replenishable grease For general use Very light duty General Light duty or slow
Type A speeds
Hand grease feed Heavier loads. Slow speed General for high loads Rarely
Type B Higher temperatures and temperatures
Centralised grease feed Heaviest loads. Slow speed. General for high loads Slow, heavy duty
Type c Higher temperatures. Higher temperatures and temperatures
Large sizes
Total loss oil Most applications All where small heat Yes Open gears
Type D removal
Wick/Pad, oil Limited (light duty) Slow speed Some Small gears
Type E
Ring or disc, oil NA Medium duty NA NA
Type F
General mist and splash Most Light duty Light duty Wide
Type G
Pressure mist Tvpe H Almost all. Excellent Rare NA Rare

Circulating oil Type J All All NA All

Table 13.6 Selection by economic considerations

Lubrication Initial Maintenance Firstfill Subsequent Su bseguent Notes
system purchase of system lubricant costs labour costs
Non- Very cheap Nil Cheap Nil Nil Life of bearing is life of
replenishable lubricant. Expensive if
grease relubricated
Type A
Grease feed Cheap Cheap Cheap Moderate Expensive Regular attendance is vital.
hand moderate but can be Neglect can be very
Type B if long expensive expensive
liner
Grease feed Moderate to Moderate Moderate to Moderate Moderate Needs comparatively
automatic expensive expensive skilled labour. Costs
Type c increase with
complications
~
Total loss oil Cheap Cheap Cheap Moderate Moderate Periodic refilling required.
Type D but can be Neglect can be very
expensive expensive
Wick or pad Cheap Cheap Cheap Cheap Cheap Also need topping-up but
Type E not so often and wick
gives some insurance
Ring or disc Cheap Nil to cheap Cheap Cheap Cheap Needs very little attention
Type F
__
General splash Cheap Nil Moderate Cheap to Moderate Oil level must be watched
Type G moderate
Pressure mist Moderate to Expensive Cheap Cheap Moderate to Needs comparatively skilled
Type H expensive expensive labour. Requires
compressed air supply
~
Circulating Expensive Expensive Moderate to Cheap Moderate Simple system requires
oil expensive little attention. Costs
Type J increase with
complications
C13.3