Summary. Description Selection characteristics Advantages/Disadvantages Applications. Sleeve Bearings. Plain Bearings Journal Bearings Bushings. Sleeve Bearing. Description:. Bearing used to constrain, guide, or reduce friction in rotary applications.
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Type of Lubrication
Relative softness (to absorb foreign particles), reasonable strength, machinability (to maintain tolerances), lubricity, temperature and corrosion resistance, and in some cases, porosity (to absorb lubricant).
A bearing element should be less than one-third as hard as the material running against it in order to provide embedability of abrasive particles.
Whitemetal - usually used as a lining bonded to bronze, steel or cast iron.
Copper Based alloys - most common alloys are copper tin, copper lead, phosphor bronze: harder and stronger than whitemetal: can be used un-backed as a solid bearing.
Aluminium based alloys - running properties not as good as copper based alloys but cheaper.
3/4" shaft @ 341 RPM, 90 lb. total load, bearing length 1".
V = .262 x RPM x shaft diameter, or .262 x 341 x .750 = 67 sfpm.
P = total load ÷ projected area (area = .750 x 1.0 = .75 in.), or 90 lbs. ÷ .75 = 120 psi.
PV = 120 psi x 67 sfpm = 8040 PV
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