The import bearing corrosion is intrinsic and the external factor causes by each kind, induces mainly has:

1, the metal surface smooth finish (oxygen concentration difference battery corrodes).

2, metal material itself chemical composition and structure.

3, with metal surface contact solution composition and pH value.

4, ambient temperature and humidity.

5, with metal surface phase contact each kind of environment medium.

6, moreover human's sweat also initiates the reason which the NSK bearing corrodes, its pH value is 5 ~ 6.Therefore in order to prevent the hand perspiration causes the corrosion, the installment and the production personnel should take to bring with the glove, do not have casually to contact the import bearing with the hand.

And is a group installs a group of same model ball bearing or above the circular cone roller bearings 2 sets, the display function, is called the combination bearing.The combination bearing most commonly used type is the single row angle contact ball bearing, mainly uses in place request load bearings and so on engine bed main axle and reduces the NSK bearing displacement as far as possible the situation.

The double row combination divides into back to back, face-to-face and compound combines 3 kinds, its combination code number respectively is DB. DF. DT (see Figure 1) a

DB and the DF combination, may withstand the bidirectional axial load.The DB combination is farther than the DF combination action point distance, therefore, widely applies in the withstanding moment of force load situation.

Although the DT combination only can withstand the unidirectional axial load, but 2 set of NSK bearings can the equality share the axial load, therefore, uses in the unidirectional load big situation.

In DB and in the DF combination bearing, through loads and the adjustment in advance, carries on optimal to the combination bearing pre-tight level, will be able as far as possible in, the addendum circle radial direction and the axial displacement reduces to needs in the scope.

Bearing surface rusty pretreatment method:

1, the surface is clean: The clean had to unify the NSK bearing surface the nature and condition then.The general commonly used method has the solvent to clean the law, the machine-cleaning method and chemistry processing cleaning.

2, after skin drying clean clean available filtration dry compressed air drying up.Or carries on dryly with the water extractor by 120~170 ℃ temperatures, finally with the clean gauze dry.




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