The seal is the important parts, agricultural machinery and all kinds of machinery and equipment on the feeler gauge inserted between FAG bearings just above 2 rollers and outer circle around the center of the bearing is widely used. Some oil seal life long year, ranging from a few months or even five days, oil spills due to Mifengbuyan and scrapped. This situation has seriously affected the efficiency of agricultural machinery and equipment, not only increases fuel consumption and production costs, and pollution of the environment.
First, the working principle of the oil seal, free state, the oil seal lip diameter is smaller than the shaft diameter, has a certain amount of interference. 2, the installation, the interference of the seal edge pressure and contraction of the self-tightening spring force on the rotation axis a certain radial pressure. 3, the working oil seal lip in the radial pressure, 0.25 to 0.5 millimeters in width sealing contact with the endless belt is formed. The role of the lubricant pressure, the fluid penetrate between the seal edge and the shaft to form a very thin layer of film. The lubricant composition of the film by the surface tension of the fluid in contact with the internal friction and lubricant mixing and extrusion, a "New Moon" is formed in the outer edge of the shaft and seal edge surface to prevent oil spills, sealing function.
The principal factors oil seal Mifengbuyan of oil seal leak caused by the oil spill caused a major factor. When the shaft wear trench is formed, even if still can not be replaced with new seals seal is too small due to the decrease of the contact pressure of the seal lip and the shaft, the amount of interference caused by the diameter of the seal lip and the shaft diameter Installed. S195 diesel engine crankshaft, for example, analysis of Mifengbuyan mainly due to: (1) oil seal manufacturing poor quality; ② shaft or of poor quality; (3) improper use and maintenance; SKF bearing measurement error does not mean that the test tolerances can be relaxed to 10 % ④ install the improper; (5) improper storage by the adverse impact on environmental pollution.
, The oil seal Mifengbuyan oil spill countermeasures, master the basic knowledge of the identification and shoddy products, buy high-quality, standard oil seal. 2, the installation, the shaft diameter outer surface roughness or rust, corrosion, from the burrs, use fine emery cloth or the Whetstone polished smooth; corresponding position in the oil seal lip or shaft diameter coated with clean oil or grease. Oil seal outer ring coated with a sealant with cardboard the shaft keyway parts package, to avoid scratches oil seal lip with a special tool to the oil seal pressed into the rotation, do not be hard to hit a hard punch to prevent oil seal deformation or squeeze-off spring failure; lip flange the spring shedding and seal skew must be removed to reload. It should be noted: Do not attempt to tighten the inner spring when the shafts no wear and oil seal spring tension enough. 3, bad oil seal used in agricultural machinery general working conditions, environmental temperature, dust, the machinery vibration frequent mechanical force status changing, ground inspection, maintenance and repair work. 4, such as the shaft and bearing wear serious; aging of the oil seal rubber or spring failure, should be promptly repair and replacement parts. Each imported bearings users worry-free operation is the ultimate goal of Qingdao Swiss precision bearings, mechanical and electrical 5, abnormally hot component or assembly should be timely troubleshooting; avoid mechanical overspend, overload, to prevent the oil seal lip temperature rises aging, rubber lip early wear. 6, we should always check the oil level, if the oil is too many impurities, there are alloy powder metal iron to completely replace the new oil. Oil change brand and quality must comply with the requirements of the season. 7, the temporarily unused oil seal, should safekeeping, to prevent oil stains, dust, or sun exposure. 8, when the shaft wear a "V" shaped groove, so that the new oil seal lip and the shaft contact pressure drop can not play the role of seal oil, the choice of the AR-5 two-component adhesive sticky complement, simple and reliable wear . Seal shift method can also be used to compensate.
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