BEARING AND LUBRICATION

Construction

The anti-friction bearing is used according to loads; and SHELL DRUM R grease is applied, since it is superior lubricant and resist deterioration. The typical bearing construction is shown in Fig. 1-3

 

Fig.1-3 Bearing Construction

Item No.	Item	Item No.	Item
1	Grease nipple	6	Locking washer
2	Bracket cover ,	7	Shaft
3	Grease pipe	8	Anti-friction bearing
4	Bracket	9	Bearing cover
5	Grease runner

Maintenance

Any abnormal condition of the bearing during motor oper¬ation results in temperature rise, abnormal noise, etc. The knowledge of the motor's normal operating condition serves to make correct judgment as to whether the motor is in normal operating condition or not.

In case, SHELL DRUM R grease superior in heat resistance is used, the temperature rise is limited to 55 degrees on the surface, when the reference ambient temperature is 40º C.The high temperature of the lubricant (grease) results in the increase in the deterioration of the lubricant, and so usually, keep the temperature not to exceed 95º C, or 105ºC at the highest.

It is difficult to describe noise, but in some case, a friction sound of the retainer can be heard like a keen metallic sound. This occurs due to the inadequate supply of grease, and so the noise goes out as soon as more grease is supplied. And similar friction sound of the retainer can be heard when the motor is restarted after long stand-by (especially in winter).

The noise nearly dies out after a small amount of grease is supplied or after the motor is operated for 20 minutes or so.