What is a Bearing and its types?

The basic structure of the bearing: the inside of the bearing is generally composed of an inner ring, an outer ring, rolling elements and a cage. For sealed bearings, there are lubricants or greases, sealing or shielded.

Rolling bearing part:

The part where the rolling elements roll on the ring is called the raceway, and the raceway of the ball bearing is also called the raceway. The rolling elements are between the raceways of the inner ring and the outer ring. The rolling elements include steel balls, cylindrical rollers, needle rollers, tapered rollers and spherical rollers. The size and quantity of the rolling elements directly affect the speed and load ability of the bearing.

Rolling bearings have a variety of structural forms, each type of bearing has its own characteristics, their common advantages are:

  1. The starting friction is small, and the difference between the starting friction and the dynamic friction is also small.
  2. International dimensions and interchangeability, suitable for mass production
  3. The wear is less than that of ordinary sliding bearings, and the mechanical accuracy can be maintained for a long time.
  4. Easy to lubricate, less lubricant consumption and low maintenance cost
  5. It can be easily used at high or low temperature
  6. The surrounding components matched with the bearing have a simple structure, which is convenient for inspection and maintenance
  7. The rigidity of the bearing can be improved by applying preload
  8. Except for a few bearings (such as thrust bearings), general bearings can bear radial load and axial load at the same time

Bearings are classified according to the load direction or the nominal contact angle that they can bear.

Radial bearing — mainly used for rolling bearing bearing radial load, its contact angle ranges from 0 degrees to 45 degrees, and is divided into:

— Radial Contact Bearings — Radial Bearings with a Contact Angle of 0°

— Angular Contact Radial Bearings — Bearings with angular contact greater than 0° to 45°

Thrust bearing – mainly used for rolling bearings bearing axial load, according to the different contact angle is divided into

— Axial contact bearing Thrust bearing with a contact angle of 90 degrees

— Angular contact thrust bearing, the contact angle is greater than 45 degrees and less than 90 degrees


Bearings are classified according to the type of rolling elements

Ball bearing — the rolling elements are balls

Ball bearings are divided into deep groove ball bearings, self-aligning ball bearings, angular contact ball bearings, thrust ball bearings

Roller bearing — the rolling elements are rollers

Roller bearings are divided into

Cylindrical Roller Bearing–The rolling element is a cylindrical roller bearing, and the ratio of the length to the diameter of the cylindrical roller is less than or equal to 3,

Needle Roller Bearings — Bearings in which the rolling elements are needle rollers

Tapered Roller Bearings — Bearings whose rolling elements are tapered rollers

Spherical Roller Bearings — Bearings whose rolling elements are spherical rollers


Bearings are classified according to the self-aligning function

1) Self-aligning bearing — the raceway is spherical, which can adapt to the angular deviation and angular motion between the axis lines of the two raceways

2) Non-aligning bearings — bearings that can resist the angular deviation of the raceway axis


Bearings are classified according to the number of rolling elements row.

1) Single row bearing — bearing with one row of rolling elements

2) Double row bearing — bearing with two rows of rolling elements

3) Multi-row bearings — bearings with more than two rows, such as three-row, four-row bearings


Bearings are classified according to whether their parts can be separated or not

1) Separable bearing — bearing with separable parts

2) Non-separable bearing — a bearing in which the rings cannot be freely separated after the bearing is finally assembled


And CoatMaster also can supply the other kinds of bearings as follows:

Double Row Deep Groove Ball Bearings Medical device bearing
Pillow Block Bearings Linear Motion Guide
Insert Ball Bearings (Y-bearings) High temperature Bearings
Double Row Angular Contact Ball Bearings Low temperature bearings
Angular Contact Thrust Ball Bearings Bearing for Agricultural machinery
Thin Section Bearings Vibrating screen Bearings
Full Complement Cylindrical Roller Bearings Paper making machinery bearings
Inch Tapered Roller Bearings Woodworking machinery bearing
Double Row Tapered Roller Bearings Industrial fan bearing
Sealed Spherical Roller Bearings Excavator bearing
Toroidal Roller Bearings Rolling Mill Bearings
Cam Roller Bearings Wheel Hub bearings
Support Roller Bearings Robot bearing
Cam Followers Bearing forklift bearing
Cylindrical Roller Thrust Bearings Automobile bearing
Needle Roller Thrust Bearings King Pin Bearings
Tapered Roller Thrust Bearings Clutch release bearings
Spherical Roller Thrust Bearings Transmission bearings/
Cross Roller Bearings bearing for speed changer
Super Precision Bearings Electric motor bearings
Double Direction Angular Contact Thrust Ball Bearings Bearings for household appliances
High precision Axial-radial Cylindrical Roller Bearings Instrument bearing
Angular contact thrust ball bearings for screw drives internal-combustion engine bearing
Linear Motion Guide construction machinery bearings
Linear Guideway railway vehicle bearing
High temperature Bearings and Bearing Units Handling machinery bearing
Electrially Insulated Bearings Machine tool spindle bearing
High temperature Bearings and Bearing Units Bearing for High frequency motor
Bearing with Solid Oil High speed bearing for Aviation turbojet engine
Ball bearing Units Bearing for Centrifugal separator
Plummer Block Housing Bearing for Differential pinion shaft
Super Precision Bearings Oil pump Bearings
Hybrid Bearings Roots blower Bearings
Full Ceramic Bearings Air compressor Bearings
Sensor Bearing Units Fuel injection pump Bearings
Slewing bearings Printing machinery
Spherical Plain Bearings and Rod Ends Truck Wheel bearings
High precision Bearings Concrete Mixer Bearings
High speed Bearings Planetary Gearbox Bearings
Heavy duty bearings Shearer bearing for mining industry
bronze alloy bearings Crescent Swing bearing for Hydraulic Pump
Self lubricating Bearing Concrete Mixer Truck Reducer Bearings
Slide Bearing