Grease has many advantages, but it also has drawbacks and limitations, its shortcomings are the following points:
(1) grease is semi-solid at room temperature do not flow, so added fat or for fat hard friction parts, bearing cleaning is not very convenient.
(2) mixing with water, dust and debris is difficult to separate. If the lubricating oil, impurities sink in the lower, or through the oil filter is easy to remove.
(3) stir greater resistance, heat a large, poor cooling effect. But it should be noted that this lubrication method has a close relationship. Oil immersion (or leaching) with oil bath lubrication, using FAT rather than oil consumption power is small. United Kingdom magazine 1973 issue of the friction and lubrication science report: rolling bearing diameter 100, speed-1500r/min, with grease lubrication, many instances of domestic energy consumption, such as refractory materials plant of Chongqing iron and steel company of refractory tunnel furnace blower motor power than the N68 of lubricating greases for lubricating oil, low bearing temperatures of 4~6 ° c.
(4) applicable to high speed too. In General, ordinary mineral oil grease only allows use of conveying speed of a DN value (the inside diameter of the bearing MMX turn speed r/min) is less than 300000mm • r/min. With the development technology of lubricating greases, synthetic lubricants can be used to 500,000 ~60 DN value, or even 1 million. Instances of grease using a high speed is (1984, Japan "defence technology" report) high altitude unmanned surveillance aircraft launch Jet bearing, in order to reduce the weight of aircraft, using grease lubrication. Bearing diameter ф 25mm temperature 200 ° c, the speed 4600r/min,DN is 1.8 million, with synthetic slick grease life 30min use requirement is met.
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