Mechanics Week 5 Quiz (Bearings) Flashcards
What is a bearing?
Anything that accommodates force and motion.
What are the two groups of bearings?
Plain Bearings and Rolling Element Bearings.
What are the 3 types of motion?
Rotary, linear, and combined.
What is the major factor in determining which bearing should be used?
Speed(V)
What is the critical element in determining which bearing should be used?
Load(P)
What are the 2 types of plain bearings?
Metallic and Non Metallic.
What is a bushing for?
Taking up space, similar to a washer.
What is a sleeve for?
Fitting or fixture.
What is the inner race?
Shaft bore.
What is the outer race?
Housing bore.
What is the primary advantage of plain bearings?
Any direction of rotation is acceptable, including partial rotation. (Radial, Linear, Axial, and Oscilating)
What are the 4 advantages of metallic plain bearings?
Higher Load Capacity
Wide Temperature Range
Structural Integrity
Cost to Performance Ratio
What is the main sub category of plain bearings?
Self Lubricating.
What is the advantage of non metallic bearings?
Offer shock absorption instead of a higher load capacity.
What are some common materials for metallic bearings?
Chrome, copper, babbit, bronze, aluminum, lead, silver, etc.
How deep should grease groves be?
1/4 the thickness of the body. (25%, Kyle)
What are the 4 methods of bearing lubrication.
Boundary
Mixed Film
Full Film/Hydro Dynamic
Hydro Static
How can boundary and mixed film lubrication be upgraded to full film?
Increase viscosity, improve shaft finish, decrease the load, or increase speed.
What are the two types of self lubricating bearings?
Self Lubricating Liners/Centering
Lubrication Plugs and Filled Grooves
What is the extreme temperature range for bearing use?
-200°F to 900°F
