German wico seals wico models wico prices

wico seals are devices that prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, along with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

wico seal operating principle

An oil film controlled by the oil seal lip exists between the oil seal and the shaft, exhibiting fluid lubrication characteristics. Under the effect of liquid surface tension, the stiffness of the oil film causes it to form a meniscus at the interface with air, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface. If the film is too thick, the oil seal will leak; if too thin, dry friction may occur, causing wear on the oil seal and shaft. If there is no oil film between the sealing lip and the shaft, overheating and wear are likely. Therefore, during installation, some oil must be applied to the sealing ring, and the skeleton oil seal must be kept perpendicular to the shaft axis. If not perpendicular, the sealing lip will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep from the housing to maintain an oil film on the sealing surface.

wico seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. They are suitable for sealing rotating and reciprocating motions. They are installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their primary function is to prevent the permeation of sealed media (gases, liquids) and the ingress of external contaminants into the equipment. Precautions: Standard oil seals have a very limited pressure-bearing range, typically 0.03 MPa. This pressure is generally generated by the height difference of the lubricating oil itself. If higher pressure sealing is required, high-pressure oil seals (generally capable of withstanding up to 1 MPa) or other sealing types should be selected.

wico seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary cause of leakage. When the shaft wears and forms grooves, replacing the oil seal may still fail to achieve a seal because the contact pressure between the oil seal lip and the shaft decreases, resulting in insufficient interference fit between the oil seal lip diameter and the shaft diameter after installation. Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for poor sealing are analyzed as follows: (1) Poor manufacturing quality of the oil seal; (2) Poor quality of the shaft or bearings; (3) Improper use and maintenance; (4) Improper installation; (5) Improper storage, leading to adverse effects from environmental contamination. 2) Countermeasures for leakage due to poor oil seal sealing: Acquire basic knowledge to identify counterfeit and inferior products, and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface of the shaft has low roughness or defects such as rust spots, corrosion, or burrs, polish it smooth with fine sandpaper or an oil stone. Apply clean engine oil or lubricating grease to the oil seal lip or the corresponding position on the shaft diameter. Apply sealant to the outer ring of the oil seal. Wrap the keyway area on the shaft with hard paper to avoid scratching the oil seal lip. Use special tools to rotate and press the oil seal inward; never hammer or force it, to prevent deformation of the oil seal or crushing of the spring, which would cause failure. If the lip flips, the spring detaches, or the oil seal tilts, it must be removed and reinstalled. Note: Do not arbitrarily tighten the inner spring if the shaft diameter is not worn and the oil seal spring has sufficient elasticity. Oil seals used in machinery often operate under harsh conditions, including large temperature differences, high dust levels, and frequent vibration, which cause constantly changing stress on components. Regular inspection, maintenance, and upkeep are required. If the shaft diameter and bearings are severely worn, or if the oil seal rubber ages or the spring fails, repair and replace the corresponding parts promptly. Troubleshoot abnormal heating in components or assemblies immediately. Avoid overspeeding and overloading the machinery to prevent increased temperature at the oil seal lip, rubber aging, and premature lip wear. Regularly check the engine oil level. If the oil contains excessive impurities, such as alloy powder or metal shavings, replace it completely with new oil. The brand and quality of the replacement oil must meet seasonal requirements. It is recommended to add Met-Rx Super Sealant & Lubricant to the engine oil. It is an excellent gearbox additive that forms an inert material film on components, which can reduce oil seal leakage, extend the service life of oil seal gears, and reduce gearbox noise. The use of this Met-Rx super sealant lubricant will not contaminate or degrade the oil.

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