A bearing is a mechanical element which allows motion between two rotating parts, with minimum friction.
An example of such rotating parts is shaft and its housing.
A good bearing is expected to do following functions.
There are several bases for classification of bearings, we will discuss all of them one by one.
Sliding contact bearings are also known as sleeve bearings, journal bearings or plain bearings.
In this type of bearing surface of shaft slides over the surface of bush which results in wear and friction.
To reduce the friction rotating surfaces are separated by a film of lubricating oil.
The bush is made of special material like bronze or white metal.
On the basis of type of lubrication applied in sliding contact bearings, they can be classified into two types.
Rolling contact bearings are also known as anti-friction bearings or simply ball bearings.
That like balls or rollers are introduced between rotating surfaces to reduce the friction.
In this type of bearing sliding contacts are replaced by rolling contacts.
On the basis of load and use requirements, ball bearings can be classified in following types.
To select a proper bearing for our application is a very important thing. Here is a quick guide for selecting right bearing.
Before determining static load carrying capacity of a ball bearing, let us first understand what a static load is.
Static load is defined as the load acting on a bearing when the shaft is stationary.
The static load carrying capacity of a shaft is defined as the static load which corresponds to a total permanent deformation of balls and races, at the most heavily stressed point of contact, equal to 0.0001 of the ball diameter.
The dynamic load carrying capacity of a bearing is defined as the radial load in radial bearing (or thrust load in the thrust bearing) that can be carried for a minimum life of one million revolution.
Needle bearings are the cylindrical roller bearings with very small diameter compared to the length of roller. They are also known as Quill bearings.
The length to diameter ratio of a needle bearing is more than four.
There are two basic types of bearing failure.
The breakage of parts happens due to misalignment or overload. This type of bearing failure can be easily avoided by selecting correct bearing.
Surface destruction of bearings can be further classified into following.
We need to lubricate ball bearing from time to time, for smooth movement of balls. To find suitable lubrication for your application, here is a quick guide.
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