Plain Bearings Flashcards
Two types of bearings are?
Plain bearings and rolling element bearings.
What are the three types of motion in bearings?
Linear, rotary, axial or thrust (combined)
What is a bearing?
Supports motion and force.
What is a sleeve?
A fitting or fixture.
What is a bushing?
Takes up space.
Inside race is?
The shaft
Outside race is?
Housing bore.
Three things about speed?
Velocity, (V), RPM
Three things about load?
Pressure, (P), ft/ponds
Formula for bearings?
Pressure x Velocity (PxV)
plain bearings Should be interpreted as inferior to rolling element bearings? True or false?
False
Advantages of plain bearings?
Don’t have to make a full rotation.
Move in all directions
Shock loading
Metallic plain bears are made of?
Bronze, copper, aluminum, lead, silver Babbitt, sintered iron.
Advantages of metallic plain bearings are?
Highest load rating.
Extreme temperatures.
Cost.
Non metallic plain bearings are made of?
Plastic, carbon fiber, fiber glass, natural wood.
Advantages of non metallic plain bearings?
Shock loading.
Wide temperature range.
Cost.
Three types of lubrications for bearings?
Boundary, mixed-film, full-film.
The load carrying ability of full film bearings increases with speed. True or false?
True. Full film bearings offer the least amount of friction and require less energy to rotate.
How to get from boundary to full-film?
Improve- shaft finish
Increase- speed
Increase - viscosity of grease
Decrease - load
How deep should the grove be on a self lubing bearing?
1/4 thickness of the wall of the bearing.
What are two types of self lubing bearings?
Solid lubricant liners, lubrication plugs/filled grooves.
Advantages of self lubing plastic bearings?
Cost
Lightest
Maintenance free
