6.8 Flashcards
What are plain bearings made from?
Hard wearing materials
When are plain bearings used?
Where loads are relatively light and motion is relatively continuous
Why are bearings used?
To support the journals of shafts and axles
What are bearings called that accept forces at right-angles to the drilling axis?
Journal or roller bearings
What are bearings called that accept forces in a longitudinal direction?
Pivot or axial bearings
Why is bearing play necessary?
To allow for continuous lubrication
What is the main disadvantage of a sliding bearing?
It’s high starting resistance
What are the two types of loads a bearing has to deal with?
Radial and thrust
Describe how thrust load works on a bearing?
When the force is coming against rotation (through the eye-end)
Describe how radial load works on a bearing?
When the force is in the same direction as the rotation (like a cog)
What are the five types of anti-friction bearings?
- tapered
- needle
- ball
- spherical
- cylindrical
Why is the roller element very important in a anti-friction bearing?
Because it replaces the high friction sliding with low friction rolling
What are the components of anti-friction bearing?
- outer raceway
- inner raceway
- rolling element
- rolling element cage
Why is a rolling element cage used?
To keep the rolling elements evenly spaced
What are the raceways and rolling elements manufactured from?
Chromium steel
