Roller Bearings Flashcards
What kind of contact do roller bearings have?
Line contact
Roller bearings have an advantage of what to ball bearings?
Highest radial loads.
High shock loads.
What are the four types of roller bearings?
Cylindrical
Needle
Spherical
Tapered
Advantage to cylindrical bearings?
Highest combined radial load and speed capacity.
Disadvantage to Line contact?
Generates more heat.
Cylindrical bearings have to have what to accommodate thrust?
Shoulders. But limited to how much heat can be disapated
What is speed limited by in cylindrical bearings?
Roller length to diameter ratio.
Grade of precision.
Type of lubrication. (Oil)
Shaft installation / alignment
Type of housing
Heat dissipation capability
What ratio makes it a needle bearing?
6:1
What is the perfect ratio for a bearing?
1:1
Two ways to mount roller bearings?
Fixed
Floating
What makes a fixed bearing fixed?
Fixing ring
Disadvantage of roller bearings?
Misalignment.
Advantage of needle bearings?
Can have very heavy radial loads I’m a minimal amount of space
What are the two types of needle bearings?
Cage separated
(Exact rotation, high speeds)
Full complement
(Drawn cup , grease contained)
Disadvantage of grease contained, drawn cup?
Rollers fall out when shaft is removed.
What kind of bearings are in cam-type bearings?
Plain or rolling doesn’t matter.
Advantage to spherical bearings?
Accommodates misalignment
High radial or combined radial and thrust load.
What degree do spherical roller bearings be with no effect?
.5 - 2
Advantage of tapered bearings?
High thrust loading
Where does shoulder face on tapered bearings?
Faces thrust
Can only take thrust in one direction.
Inner race of tapered bearings?
Cone
Outer race of tapered bearings?
Cup
