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TOPIC: BEARINGS OBJECTIVE: TO TALK ABOUT THE IMPORTANCE OF BEARINGS WHILE DESCRIBING THE DIFFERENT TYPES OF BEARINGS AND THEIR USES. Presenter: SHER AFZAL PARACHA. Introduction.

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TOPIC: BEARINGSOBJECTIVE: TO TALK ABOUT THE IMPORTANCE OF BEARINGS WHILE DESCRIBING THE DIFFERENT TYPES OF BEARINGS AND THEIR USES

Presenter: SHER AFZAL PARACHA


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Introduction

  • A bearing is a component used to reduce friction in a machine. Bearings may be classified broadly according to the motions they allow and according to their principle of operation.

  • The concept behind a bearing is very simple: Things roll better than they slide. Bearings reduce friction by providing smooth metal balls or rollers, and a smooth inner and outer metal surface for the balls to roll against. These balls or rollers "bear" the load, allowing the device to spin smoothly.

  • Common motions include linear and rotary. A linear bearing allows motion along a straight line, for example a drawer being pulled out and pushed in. A rotary bearing allows motion about a center, such as a wheel on a shaft or a shaft through a housing. Common kinds of rotary motion include both one-direction rotation and oscillation where the motion only goes through part of a revolution.


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Main Types of Bearings

  • Ball Bearing, which is the most common of all the types. A sphere is used in between two races which results in a very less contact area making it move very smoothly. Used in applications where there is a relatively small radial or thrust load.

  • Roller Bearings, in which cylinders are used instead of spheres, increasing the contact area so that it holds a greater radial load.

  • Ball Thrust Bearings are used for low speed applications and cannot handle much radial load.

  • Roller Thrust Bearings, which can support large thrust loads.

  • Tapered Roller Bearings can support large radial and thrust loads.


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Ball bearing

Cutaway view of a ball bearing


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Roller Bearing

Cutaway view of a Roller Bearing




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Tapered Roller Bearings

Cutaway view of (left) a spherical roller thrust bearing and (right) a radial tapered roller bearing


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Some Uses

  • Ball bearings are found in everything from inline skates to hard drives.

  • Roller Bearings are used in applications like Conveyer Belt Rollers.

  • Bars Tools and Lazy Susan Turntables use ball thrust bearings.

  • Roller Thrust Bearings are used to support thrust loads in car transmission between gears, in between housing and the rotating shafts, etc.

  • Tapered roller bearings are used in car hubs, where they are usually mounted in pairs facing opposite directions so that they can handle thrust in both directions.


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Therefore bearings are used in a lot of different mechanical devices and are very important to make different applications durable, noiseless and efficient.

References:

http://science.howstuffworks.com/bearing3.htm

en.wikipedia.org/wiki/Bearings

Conclusion


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