Rolling Element Bearings Flashcards
What is a rolling element bearing?
Supports load and motion
Most common issues with rolling element bearings?
Lubrication
Contamination
Misalignment
High load/low speed
Ball bearings
Cost less then roller type
Used for light to moderate loads
Small area of contact (point contact)
High speeds
Less heat generation
Two types of radial ball bearings?
Conrad
Filling slot
Conrad
Moderate radial loads
Moderate thrust loads in each direction
More heat desperation
More speed less load
Filling slot
Higher radial loads
Light thrust loads in combination with radial loads
Filling slot must face side of thrust load
Double row deep grove ball bearings
Handles high thrust and radial loads in both directions
Same speed as single row
Self aligning radial ball bearings
Compensates for misalignment
Shock load / vibration
Low speed / low load
Angular contact bearings
Used for excessive thrust issues in horizontal thrust loading
Less radial load
Hugh thrust / moderate radial load
Three ways to mount angular contact bearings
Tandem - used when thrust is in one direction (face to back)
Back to back - more end play / thermal expansion (shoulder to shoulder)
Face to face -most common / no end play
Thrust ball bearings
Vertical thrust loads (loads running parallel to axis of Rotation)
Two types of thrust ball bearings
Flat race , flat seat ( light loads, one side rotates, 1/3 load capacity of grooved race flat seat)
Grooved race , flat seat ( most common of thrust bearings, both sides rotate, heavier loads)
Precision / super precision ball bearings
Used for exact rotation, high accuracy, limited end play, smooth running, highest speeds.
Disadvantages of super precision ball bearings
Hard to maintain
Hard to lubricate
No shock loading / vibration
Unground bearings
Fewer parts
Cost less
Reduce install costs
Radial , thrust , and combination types of loading
Light load / low speed
More radial and axial freedom
