How does the imported machine oil seal work?
Oil seals are important parts of various types of machinery and equipment for agricultural machinery and imported bearings, and are widely used. Its performance and quality directly affect the reliability of the use of agricultural machinery and various mechanical equipment. Some oil seals have a long life span of one year, a few months or even three or five days, and oil leaks due to poor sealing. This situation has seriously affected the working efficiency of agricultural machinery and various mechanical equipment, which not only increases fuel consumption and production costs, but also pollutes the environment.
First, the working principle of the oil seal 1. In the free state, the inner diameter of the oil seal lip is smaller than the shaft diameter, and has a certain amount of interference. 2. After installation, the interference pressure of the oil seal cutting edge and the contraction force of the self-tightening spring generate a certain radial pressure on the rotating shaft. 3. When working, the oil seal lip forms a sealing contact belt of 0.25 to 0.5 mm width under the action of radial pressure. Under the action of the lubricating oil pressure, the oil penetrates into the oil seal edge and forms a very thin oil film between the rotating shaft. The oil film is subjected to the surface tension of the oil to form a "new moon" surface on the outer edge of the rotating shaft and the oil seal cutting edge to prevent oil from overflowing and to seal.
Second, the main factors causing oil seal oil leakage The oil seal is not strict is the main cause of oil leakage. When the shaft wears and forms a groove, even if the new oil seal is replaced, the contact pressure of the oil seal lip and the shaft is lowered, so that the interference of the diameter of the oil seal lip and the shaft diameter after installation is too small. Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for the poor sealing are: 1 poor quality of oil seal manufacturing; poor quality of 2 shafts or bearings; 3 improper use and maintenance; improper installation of 4NACHI bearings; 5 improper storage, environmental pollution Causes adverse effects.
Third, the oil seal is not tight and the oil leakage measures 1, master and identify the basic knowledge of counterfeit products, buy high-quality, standard oil seal. 2. When installing IKO bearing, if the surface roughness of the shaft diameter is low or there are defects such as rust, rust and burr, it should be smoothed with fine sand cloth or oil stone; apply oil or lubrication to the oil seal lip or shaft diameter corresponding position. grease. Apply sealant to the outer ring of the oil seal, wrap the key groove on the shaft with hard paper to avoid scratching the lip of the oil seal, and use a special tool to rotate the oil seal inward. Do not harden the hard seal to prevent deformation of the oil seal. Or the spring is broken and the spring is broken; if the lip is turned over, the spring is detached, and the oil seal is skewed, it must be removed and reloaded. It should be noted that when the shaft diameter is not worn and the oil seal spring is strong enough, do not tighten the inner spring without authorization. 3. The oil seal applied to agricultural machinery generally has poor working conditions, large environmental temperature difference, dust, and frequent vibration of the machine. When the mechanical force of the machine is constantly changing, it is necessary to inspect, maintain and maintain. 4. If the shaft diameter and bearing wear are serious; oil seal rubber aging or spring failure, etc., repair and replace the corresponding parts in time. 5, for abnormal heating components or assemblies should be promptly eliminated; avoid mechanical overspeed, overload operation, to prevent oil seal lip temperature rise, rubber aging, early lip wear and so on. 6. Always check the oil level of KOYO bearing oil. If there are too many oil impurities, completely replace the new oil when there is alloy powder and metal iron filings. The oil brand and quality should be changed according to the season requirements. 7. Oil seals that are not used temporarily should be kept in a safe place to prevent oil, dust or sun exposure. 8. When the shaft diameter is worn into a “V” shaped groove, the new oil seal lip and the shaft contact pressure can not be used to seal the oil. The AR-5 component adhesive can be used for adhesive repair, which is simple, reliable and wear-resistant. . It can also be compensated by the method of oil seal displacement.
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