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All you Wanted to Know Regarding Ball Bearings

2017年4月6日 下午8:58:52 黑与白 科技

As the name suggests, ball bearings are bearings containing balls that separate its two moving parts. The bearing facilitates the working of moving components and supports the weight. Numerous items of daily use incorporate ball bearings. Examples of such items will be vehicles, luggage wheels, skates and hard drives for computers. Giant sized ball bearings find application in making modern buildings earthquake-proof.

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Working

A ball bearing essentially has a few smooth spheres, sandwiched between its two smooth surfaces. For example, the wheel of your skate comprises of a smooth inner ring and another external ring. The area within the two rings contains balls that carry the load, while allowing its two rings to rotate, but keeping the friction to a minimum, resulting to a fast and efficient motion.

Function

The purpose of using bearing is to facilitate the rolling of lifeless objects. It is preferred to roll the products rather than sliding them, as the amount of friction coming into play during the rolling is considerably lower.


Deep groove

These kinds of ball bearings are frequently used for appliances working under high-speed, like electric motors. They can bear plenty of radial force for prolonged periods of time. The design of sealed and shielded models makes these bearings appropriate for working under dirty and dusty environments. The seal or shield protects the bearing by preventing foreign matter from entering it and retaining the grease within it.

Load bearing capacity

Usually, ball bearings are capable of running at high-speed, but their load carrying capacity is average. They can carry medium loads only, and they are most often used in household goods, like mixers, grinders, fans etc.


Limitations

The biggest limitation of a ball bearing is the fact that, because of its small weight, it is unable to carry too much of weight. Since the area of contact is small, it tends to get deformed when subjected to excessive pressure. And then, certain designs of bearings make them quite noisy.

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However, we can get ball bearings having some extraordinary constructional features, such as sealed and shielded models.

Benefits

Since the surface contact in case of ball bearings is very small, the frictional forces are reduced to minimum. They rotate very smoothly. They may be used under conditions of radial and thrust load. The radial load causes pressure on the sides of the bearings and the thrust load is direct weight.

Shielded

The special feature of such a bearing is the fact that it shields its rolling parts from external dirt and filth. Usually, special rubber or plastic is used for making such shields.

Sealed

This kind of bearing is totally sealed and contains lubricants within it. Its design prevents other fluids from entering the rolling area, and simultaneously also stops the lubricants contained within from coming out.


Though ball bearings can bear reasonably big radial loads, they can bear only limited axial loads. So, we can't use these bearings for applications involving heavy axial loads.

However, they find many applications. Typical applications would include:

Bicycle wheels
Automobile wheels
Dental equipment
Drums of washing machines
Machine tools like lathes, drills and milling machines.
The development of bearings is an ongoing process. For example, we also have fluid bearings, which incorporate a skeletal layer of gas or fluid in the place of steel balls. Such bearings are usually found in hard drives of computers.

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