Date: 2013-08-20

Shortcomings when used bearing grease

The use of grease in the bearing has many advantages, but there are several of the following disadvantages:
(1) Grease is a semi-solid at room temperature does not flow, so the friction parts for fat plus fat or more difficult, bearing cleaning is not very convenient.
(2) mixed with the water, dust, debris is difficult to separate out. For oil, impurities generally in the lower sink, or through the oil filter is easily removed.
(3) mixing greater resistance, and thus a large amount of heat, the cooling effect is poor. However, it should be noted here, that same is closely related to lubrication. Such as lubricating oil with full immersion (or partially submerged) style oil bath lubricated with grease rather than oil, small power consumption. Such as the UK, "Friction and Lubrication Science" magazine in 1973 six reports: rolling bearings with a diameter of 100, speed is 1500r/min, lubricated with grease, domestic energy consumption are also many examples of this, such as Chongqing Iron and Steel Company plant refractories refractory tunnel kiln induced draft fan motor power than the N68 lubricant grease, bearing temperature lower 4 ~ 6 ° C.
(4) is not applicable for high speed. Generally, ordinary mineral oil grease only allowed to use the convey speed DN value (bearing diameter mm × rotating speed r / min) than 300000mm • r / min. With the development of technology grease, synthetic lubricants can be used to DN value of 50 million to 60 million, or 1 million. Grease used example is the highest speed (1984 Japan's "Defense Technology" reports) high-altitude unmanned reconnaissance aircraft jet engine bearings, in order to reduce the weight of the aircraft, using grease lubrication. Bearing diameter ф25mm, temperature 200 ° C, speed 4600r/min, DN value is 1.8 million, with synthetic grease slick life meets the requirements 30min
(5) stir greater resistance, and thus larger heat, the cooling effect is poor.

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