sintered metal-Something About Sintered Metal Powder Bearings

According to thepowder metal forms of friction on work， bearings can be divided into rolling bearings and plain bearings。 And the latter can further be divided into self-lubricating bearings， oil lubricated bearings and gas lubricated bearings。

Bearings that produced by lurgy method generally known as powder metallurgy self-lubricating bearings， sintered metal powder bearings， and sintered metal bearings。

Powder metallurgy oil-impregnated bearing is a kind of alloy product。 When the shaft rotates， due to the friction between the shaft and bearings， bearing temperature will be increased and there will be a pump suction function。 As a result， oil will leak on the internal diameter of the friction surface。 When the shaft stops rotating， the oil will be back to the inside of bearings。 It is the working process of self-lubricating bearings。 Therefore， these products have less consumption of lubrication oil。 They can operate in a long period of time without the offering of external oil。 They are especially suitable for some special places。

Oil-impregnated bearings have many advantages。 Firstly， they are less noisy than the rolling bearings。 The vibration is small。 It is easy to produce them。 They do not require special oil supply。 Besides， they have flexible shape design。 They can be manufactured in a large amount。 The prices are comparatively low。

At the same time， they also carry a lot of disadvantages。 Because they are sliding bearings， their friction coefficient is bigger than the rolling bearings´。 Besides， costs will be high if they are produced in a small scale。

It should be clarified that the name of the oil-impregnated bearings does not mean that they do not require additional oil。 It just shows that they have already carried a certain amount of oil。 And it is unnecessary to add a lot of oil to them。

Sintered metal powder bearing has become essential part for the development of the automotive， appliance， audio equipment， office equipment， precision machinery。 Currently， according to bearing usage， the main transport machinery such as cars account for about 41%。 And the industrial machinary like office machinery take up about 21%。 Other applications account for about 5%。

Except for the important usage of the sintered metal powder bearing， the amount of bearing material is increased gradually。 Meanwhile， it plays a more and more important role in the manufacturing of machinery。 Now， sintered metal powder bearing material is not only the substitute for some traditional bearing alloys， but also a kind of important structural material in the mechanical manufacturing industry。

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