Definition of a bearing
to allow smooth, low friction motion between two surfaces
what do bearings do? (3)
- support two rotating shafts
- convert sliding friction to rotatory friction
- act as a guide
Types of bearings - rolling element (2)
- plain
- roller
Types of lubrication for bearings (4)
- boundary
- mixed film
- full film
- hydrostatic
Parts of a rolling bearing
- Inner raceway
- Outer Raceway
- rolling element
- cage
- seal
Types of Rolling Bearings
- ball bearing
- cylindrical bearing
- spherical
types of ball bearings (4)
- radial
- axial (angular)
- deep grove
- thrust
types of cylindrical bearings (3)
- radial
- tapered
- needle
ball bearing has ____ _____ __ ______ between balls and raceways
smaller area of contact
ball bearing has _____ & ____ than roller bearing
- lower load capacity
- higher speed
Ball bearings support which types of loads
radial and axial
angular contact bearing are better for …
supporting combined loads
single row ball bearings (2)
- high thrust loads
- moderate radial loads
double-row ball bearings (3)
- higher radial loads
- higher thrust loads
- thrust load in both directions
difference between radial bearings and thrust bearings?
- radial bearings have inner and outer race
- thrust bearings have no inner and outer races
deep groove can support
higher loads
roller bearings, compared to ball bearings handle… (3)
- heavier loads
- higher shock loads
- more sensitive to misalignment
- more friction –> less speed
cylindrical roller bearings handle … (3)
- high radial load
- high-speed capacity
- accommodates some thrust loading
needle roller bearings are used for what kind of applications?
- heavy duty
- high speed
disadvantage of tapered roller bearings
- act like a wedge under heavy loads
- more friction
which bearing has the greatest load capabilities?
self-aligning roller bearing
