Bearing
Bearing is the machine part which supports the rotating shaft, axles etc. Shaft rotates smoothly in the bearing.
Hence loss of power due to friction is reduced. Bearing also confirms the motion of shaft.
Classification of bearing
1) sliding contact bearing ( or ) plain bearing
2) Rolling contact bearings ( or ) Anti friction bearing
1)sliding contact bearing
Based on oil film thickness
a) zero film
b) Thin film
c) Thick film
d) Hydro static bearing
Based on direction of load
a) Radial ( or ) journal bearing
b) Thrust bearing
2) Rolling contact bearing ( or ) anti friction bearing
1) Ball Bearings
2) Roller bearings
1) Ball bearing
Based on direction of load
a)Radial ball bearing
b) Thrust ball bearing
c) Radial thrust ball bearing
2) Roller bearing
a) Radial roller bearing
b) Thrust roller bearings
c) Radial thrust roller bearing
Sliding contact bearings
They are also called plain bearing. Lubricant oil film is kept between shaft and bearing. The mating are in sliding contact. Hence it is known as sliding contact bearing.
Advantages
1) long life
2) low cost
3) simple design
4) silent in operation
5) withstands shocks
Disadvantages
1) more friction
2) More loss of power
3) High maintenance cost
4) Large amount of lubricant is required.
5) Less accuracy
Application
1) Diesel engines
2)Gas engines
3) Pumps
4) Compressors
5) Turbines
6) Conveyors
2) Rolling contact bearing
They are also named as anti friction bearing. Balls or rollers are placed in between shaft and bearing. The mating surfaces are in rolling contact.
Hence it is called rolling contact bearing.
Advantages
1) Less friction
2) Less loss of power
3) Low maintenance cost
4) Less axial space is enough
5) More accuracy
Disadvantages
1) High cost
2) Noisy in operation
3) Short life
4) Breaks easily
5) Complicated design
Application
1) Automobile
2) Machine tool
3) Generator
4) Motor
5) lift
6) crane
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