Bearing:
A Bearing is
a machine element, that constrain relative motion to a desired direction and
reduces friction between moving parts.
Bearings are
classified according to the type of operation, and the direction of loads
applied to the parts.
Types of Bearings:
There are 6 common
types of bearings based on their operations.
- Plain Bearing
- Rolling
element Bearing
- Ball Bearing
- Roller Bearing
- Jewel Bearing
- Fluid Bearing
- Magnetic Bearing
- Flexture Bearing
Plain Bearing:
It consist
of a shaft rotating in a hole.
Ex: Bushing,
Journal bearing, Sleeve bearing, Rifle bearing, Composite bearing.
Bushing: Radial plain bearing that is a complete cylinder.
Journal Bearing: A shaft (journal) that rotates freely in a shell
Bushing: Radial plain bearing that is a complete cylinder.
Journal Bearing: A shaft (journal) that rotates freely in a shell
Rolling Element Bearing:
In this type
a rolling element is between the turning and stationary hub which prevent
sliding friction.
These are of
2 types: 1) Ball Bearing & 2) Roller bearing
Ball Bearing: in this type, the rolling elements are spherical
Roller Bearings: in this type the rolling elements are
Cylindrical rollers.
Jewel Bearing:
It is a type
of plain bearing in which one of the bearing surfaces is made of an Ultrahard
glassy jewel material.
Fluid Bearing:
It is a non
contact bearing (no contact between shaft and hub & completely filled with
lubrication). In this type, load is supported by the gas or liquid.
Magnetic Bearing:
In this
type, the load is supported by Magnetic field.
Flexture bearing:
In
this type, motion is supported by a load element which bends.