>> P.53
1N=0.102kgf=0.2248lbs.1mm=0.03937inchABCDEFGHIJKLMGrease lubrication1 Amount of grease to be filledThe amount of grease to be filled depends on 2 Replenishment of greaseThe life of grease depends on its type and quality, the type and dimensions of the bearing, operating condi-the tions, temperature, amount of wear, penetration of for-housing structure, dimensions, type of grease used eign particles and water, etc.and atmosphere. Generally, lling about 1/3 to 1/2 of Fig. 20 shows the grease replenishment intervals as a the free space inside of the bearing and the housing general guideline. The values obtained from this is considered to be appropriate. Too much will cause diagram apply under normal load conditions when the a rise in temperature, and care should be taken espe-machine body is stationary and forces such as inertia cially at high speed rotations.are not acting on it, and the operating temperature on In Fig. 19, several grease pockets are provided by the the outer surface of the bearing outer ring is less than grease sectors on one side of the bearing. Even if the +70°C. If the temperature exceeds +70°C, as a lled grease is dispersed by the centrifugal force at general rule, the replenishment interval is halved for high rotational speeds, it is trapped by the grease every 15°C increase.pockets and diverted back into the bearing again. Old grease accumulates in the space on the opposite side of the bearing, and this can be removed periodically by taking off the cover.200200400600100020004000600010000Rotational speed,n min-1Remarkd is the bore diameter of the inner ring. For a bearing without an inner ring, the roller set bore diameter Fw is used for d.Fig. 20 Interval for replenishment of greaseA50d=10mm203040506080100120140160180200240280300Fig. 1920000150001000080006000500040003000200015001000800600500400300Replenishment interval for grease, tf hours
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