Wednesday, July 15, 2020

Basics of bearing

Bearing

The term bearing comes from the bear, a bearing is a component that supports load while permitting relative motion between two parts of the machine. Bearing is an important part of a machine which carries load, reduces friction and gives a smooth operation. The selection of bearings is based on the requirement of the operating load for a given period of equipment. Centrifugal pump


Type of bearing

  •         Rolling contact bearing
  •         Plane bearing (sleeve bearing)
                      
type-of-bearing

Type of bearing


Rolling element bearing


A rolling element bearing carries load between two parts by placing the circular element between the inner and outer race of the bearing. Rolling contact bearings are designed to carry a high radial and high axial load, or combination of both. Many types of circular element are used in rolling element bearings like, balls, spherical roller, needle roller, taper roller, circular bearing. Rolling contact bearings are divided into two categories.


Types of rolling contact bearing

  • Ball bearing
  • Roller bearing
But these two types of bearing are divided in many parts,  latter we will discuss in detail. There are a variety of Rolling contact bearings available in the industry.


Types of ball bearing

Ball bearings are classified into three types
  • Deep groove ball bearing
  • Angular contact ball bearing
  • Self aligning ball bearing
To get deep knowledge of any type of bearing, you have to learn about construction, application, and features.


Deep groove ball bearing

Deep groove ball bearing run with very low friction because of the point contact between balls, inner race and outer race. It has less noise due to being preloaded during installation. Very little misalignment is tolerated between the inner and outer races of bearing. Axial movement is not permitted, this type of bearing can not be used as a floating type.
Deep groove ball bearing

Deep groove ball bearing

Applications


  • Motorcycles and other types of low weight vehicles
  • Small and medium duty electric motor, and electric fans.
  • Convener systems and small size or light duty gear boxes.
  • Low duty machinery tools like torquing tools
  • Low and medium duty pumps.

Angular contact ball bearing

Angular contact ball bearings are constructed with axially asymmetric races and able to bear higher thrust and radial load, while higher contact angles are kept around 40 degrees. Angular contact ball bearing can take radial load with high axial load, it is also used for combined load application. It may be used in pairs in “O”, that is back to back arrangement, ‘X’ for face to face arrangement and tandem arrangement. It can run at high speed, high accuracy with low noise. But axial displacement is not possible in it and it does not compensate for misalignment.
Angular contact ball bearing

Angular contact ball bearing

Applications


  •  High speed application
  • Gear boxes
  • Clutch system
  • Motorcycle over head system
  • Mills
  • Wind energy
  • Steel plants
What is the nominal angle for angular contact bearing?

Self aligning ball bearing
It consists of two rows for the ball with a common spherical outer race, and a cage is between the inner and outer race of the bearing. In the self aligning ball bearing inner ring have two raceways. The self aligning ball bearing is recommended when the machine shaft can be bent during operation and housing deformation, or the alignment between shaft and housing is difficult, and it creates less friction than other types of bearing. This type of bearing with the taper bore that's why it is easily fits in the shaft with the adapter assembly.
Self aligning ball bearing
Self aligning ball bearing


Application

  • Textile
  • Mining
  • Heavy machinery
  • Power machinery
  • Agriculture
  • Liquid ring compressor

Types of roller bearing

  • Cylindrical roller bearing
  • Spherical roller bearing
  • Needle roller bearing
  • Taper roller bearing


Cylindrical roller bearing

there are many types of cylindrical roller bearing are use. but single row cylindrical roller bearing are mostly use, cylindrical roller bearing takes more space as compare to other type of bearing during installation.
single row cylindrical (B.) have radial load carrying capacity is less. But double or multi row cylindrical roller bearing are used for carrying heavy radial load.
Cylindrical roller bearing

Cylindrical roller bearing

Application

  • In power generation
  • Oil field
  • Heavy duty gear box
  • Machine tools transmission
  • Vibration machine
  • Trains wheels
  • And other types of heavy redial loads machinery.








Taper roller bearing

It is constructed with taper inner and outer raceways. The inner and outer ring is separated by the taper roller it is used in tight fitting arrangement. When used in pairs arrangement, proper internal clearances and preload can be set by adjusting the distance between two bearing inner and outer rings. Designed to accumulate the combined load, the axial load carrying capacity of the bearing depends on the contact angle between raceway and rollers. It means that the larger the contact angle, the capacity to bear the axial load is large (heavy).
Taper roller bearing

Taper roller bearing


Applications 

  • Mostly use for combined load
  • It is use in face-to-face, back-to-back or in tandem
  • Gear box
  • Overhead hoisting equipment
  • Mining equipment
  • Rolling mills


Spherical roller bearing

It is a types of rolling element bearing and used for heavy heavy radial and axial load applications. It can bear more angular misalignment as compared to others. Spherical roller bearing consists of the outer ring having a continuous spherical raceway. Within that spherical race, two rows of barrel-shaped rollers are operate. 
This barrel-shaped roller is intended to be guided by an inner ring raceway. But misalignment and shaft deflection is a big challenge for Spherical roller bearing because it can not bear more misalignment and shaft deflection for prevent this type of problems use with combination of spherical roller bearing. Spherical roller bearing is used in two combinations. single row Spherical roller bearing, and double Spherical roller bearing as per required application.
Spherical roller bearing

Spherical roller bearing


    Application

    • Use in equipment for shock resistance 
    • Use for bear heavy load due to it ring arrangement
    • Heavy gear box
    • Turbine
    • Compressor and mining equipment
    • Mechanical fan
    • Construction equipment 


    Needle roller bearing

    This is a type of roller bearing.  In this type of bearing very thin cylindrical rollers are used. The number of rollers used in this bearing is more than other types of roller bearing, so the radial load carrying capacity is also more. It is used as an interchange of sliding bearings. The Needle roller bearing is available in many types of arrangement like, single row, double row, and split case.
    Needle roller bearing

    Needle roller bearing




      Application

      • Rocker arm pivot
      • Power transmission
      • Pump
      • Compressor 

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