The defects of the bearing grease

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The grease in the bearing has many advantages in use, but there are several disadvantages of the following:
(1) Grease is semi-solid, at room temperature does not flow, so the friction member fatliquoring or exch ange lipid more difficult, and cleaning of the bearings is not very convenient.
(2) mixing the moisture, dust, and debris are difficult to separate out. Lubricants, impurities generally submerged in the lower portion, or easily removed by the oil filter.bearing company
(3) stirring the resistance is large, and thus heat, the cooling effect is poor. But should be noted here that, which has a close relationship with the lubrication method. Such as lubricating oil immersion (or partially submerged), oil bath lubricated, grease rather than oil consumption of power. Such as friction and lubrication, "June 1973 reported: diameter 100 Rolling speed 1500r/min, greased, energy consumption this instance also many, such as Chongqing Iron & Steel Company refractories plant refractory tunnel kiln induced draft fan motor power grease than using the N68 lubricant, bearing 4 to 6 ° C lower temperature.(4) is less suitable for high speed. In general, the ordinary mineral oil grease is only allowed to use to convey speed DN value (bearing inner diameter mm × transfer speed r / min) is less than the 300000mm · r / min. With the development of the technology of grease, synthetic lubrication can use to DN value of 500,000 to 600,000, or even 100 million. The grease used in most high-speed instance Japan defense technology "reported (1984) high-altitude unmanned jet reconnaissance aircraft engine bearings, in order to reduce the weight of the aircraft, using grease lubrication. The bearing diameter Ñ„25mm, a temperature of 200 ° C, speed 4600r/min DN value is 180 million, to meet the lifetime synthetic oily fat 30min use requirementssealed bearings
(5) were stirred greater resistance, and thus heat, the cooling effect is poor.