Bearings are parts that allow the shafts inside machines to rotate smoothly. They are used in a wide range of fields, including aviation, space, railways, automobiles and motorcycles, machinery, leisure equipment, home appliances, energy equipment, and office equipment, supporting our lives and industry.
A car uses 100 to 150 bearings in the engine, transmission, wheels, etc., and they are essential parts for safe driving. Examples of where bearings are used in a car are shown below.
| Engine
Many bearings are used in engines, auxiliary equipment, etc. |
Electric component
Many bearings are used in alternators, starter motors, car air conditioners, etc. |
chassis
Special bearings are used for suspensions, wheels, etc. |
| Steering
Bearings are used in the rotating parts of the steering column and steering gear. |
Manual Transmission
Ball bearings, roller bearings, and tapered roller bearings are used for shaft support bearings in automotive manual transmissions. |
Automatic Transmission
Needle roller bearings are used in automatic transmissions for automobiles. |
History of bearings
Bearings have a long history, dating back to BC. In ancient Egypt, when building pyramids, heavy stones were transported by placing logs under them. The principle behind bearings is to reduce friction and transport heavy objects lightly.
The basic principles and structure of modern bearings were formed during the medieval industrial revolution. The picture below is a drawing of a bearing drawn by Leonardo da Vinci.
Bearing type
Bearings can be broadly divided into two types: rolling bearings and sliding bearings, each based on different principles of friction. In general, rolling bearings have lower friction when the machine rotates, and rolling bearings have a structure that utilizes rolling friction by using balls and rollers as rolling elements between the outer ring and inner ring. Rolling bearings are easier to maintain than sliding bearings, are commonly lubricated with grease, and have convenient lubrication and sealing devices.
Deep groove ball bearings |
It is the most common bearings using balls. It is suitable for high-speed rotation as it supports radial loads and is widely used in various fields. |
| Angular contact ball bearings
|
A bearing in which the balls contact the inner and outer rings at an angular angle. It can bear radial and axial loads. |
| Cylindrical roller bearings
|
A bearing using cylindrical rollers. It receives radial loads. Because it uses rollers, it can withstand large forces and shocks. |
| Taper roller bearings
|
A bearing using conical rollers. The raceway surfaces of the inner and outer rings on which the rollers roll are also conical, allowing them to receive radial and axial loads. |
| Needle roller bearing
|
A bearing that uses many elongated rollers. It receives radial loads. Because the inner and outer rings are thin and use many thin rollers, they can withstand large forces relative to the size of the bearing. |
| Self‐aligning roller bearing
|
A bearing that uses barrel-shaped rollers called spherical rollers. It receives radial and axial loads. Since the rolling surface of the outer ring on which the rollers roll is spherical, it can accommodate deflection and tilt of the shaft. |
Bearings that do not use balls or rollers are called sliding bearings. There are resin types, metal types, etc. Each material has a variety of characteristics, such as those that are resistant to water and those that do not conduct electricity.
Bearing makers list that we mainly handle.
| No. | Maker |
| 1 | NTN |
| 2 | NSK |
| 3 | KOYO |
| 4 | NACHI |
| 5 | NMB |
| 6 | ASAHI |
| 7 | FYH |
| 8 | OZAK |
| 9 | THK |
| 10 | DAIDO |
| 11 | IKO |
| 12 | OILES |
| 13 | SANKYO OILLESS Industry |
| 14 | DAIDO METAL |
| 15 | ASK |
| 16 | BANDO |
| 17 | TSK |
| 18 | FREEBEAR |
| 19 | EZO |
| 20 | NB |
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