The oil seal is an important part of agricultural machinery and various types of mechanical equipment. The feeler gauge is inserted between the two rows of rollers on the IKO bearing and the outer circle and is widely used around the IKO bearing center. 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 inner friction of the lubricant at the contact and the agitation and extrusion of the lubricant are affected by the surface tension of the oil, forming a “new moon” on the outer edge of the shaft and the oil seal to prevent oil from overflowing and sealing. .
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 crankshaft oil seal of S195 diesel engine as an example, the main reasons for the poor sealing are: 1 poor quality of oil seal manufacturing; poor quality of 2 shaft or IKO bearing; 3 improper use and maintenance; IKO bearing measurement error does not mean that the inspection tolerance can be relaxed 10%4 improper installation; 5 improper storage, adversely affected by environmental pollution.
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, if the outer surface roughness of the shaft diameter is low or there are defects such as rust, rust, burr, etc., smooth it with fine sand cloth or oil stone; apply clean oil or lubricating grease at the corresponding position of the oil seal lip or shaft diameter. 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 IKO bearing are seriously worn; the oil seal rubber aging or spring failure, etc., repair and replace the corresponding parts in time. Providing every IKO bearing user with worry-free operation is the ultimate goal of Qingdao Ruijing IKO Bearing Electromechanical 5. To eliminate faults in abnormal heating components or assemblies; avoid mechanical overspeed and overload operation to prevent oil seal lip temperature rise High, rubber aging, early wear of the lips, etc. 6. Always check the oil level of the engine oil. If there are too many impurities in the oil, replace the new oil with the 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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