German cellofoam seals cellofoam model cellofoam price

cellofoam seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission assembly from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully encapsulated in rubber; the term oil seal generally refers to this type of tc cased oil seal.

cellofoam seal principle

Since there is an oil film controlled by the oil seal lip between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end where the oil film contacts the air to form a meniscus, preventing the leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of the oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, 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, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the cased oil seal is perpendicular to the shaft axis; if not perpendicular, the sealing lip of the oil seal 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 out from the housing to achieve the state of forming an oil film at the sealing surface.

cellofoam seal applications

Cased 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 rotary and reciprocating motions. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Mainly prevents the permeation of sealed media (gas, liquid) and the entry of external foreign matter into the body. Precautions: The pressure bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure needs to be sealed, high-pressure oil seals should be selected (generally can withstand up to 1 MPa pressure) or other sealing forms should be selected.

cellofoam seal precautions

1) Obtain a fixed quantity of oil seals. 2) From receipt to assembly, the oil seals must be kept clean. 3) Before assembly, inspect the oil seals, measure whether the dimensions of all parts of the cased oil seal match the shaft and housing dimensions. Before installing the cased oil seal, clearly compare the shaft diameter with the inner diameter of the oil seal; they must match. The internal dimensions of the housing must be suitable for the outer diameter width of the oil seal. Check whether the lip of the cased oil seal is damaged or deformed, and whether the spring has fallen off or rusted. Prevent the oil seal from being placed flat during transportation, subjected to external squeezing and impact, which would destroy its roundness. 4) Perform machining inspection procedures before assembly, measure whether the dimensions of the housing and shaft parts are correct, especially the internal chamfer, which must not have a slope. The end face machining of the shaft and housing must be smooth, with no damage or burrs on the chamfer. Clean the assembly area; there must be no burrs, sand, iron chips, or other debris at the shaft insertion area (chamfer), as these will cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfer area. 5) In terms of operational technique, you can feel with your hand whether it is smooth and truly round. 6) Do not tear open the packaging paper of the cased oil seal too early before installation, to prevent debris from adhering to the oil seal surface and being brought into operation. 7) Before machine installation, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the cased oil seal to prevent dry grinding of the lip during instantaneous shaft startup, which affects the interference fit of the lip, and assemble as soon as possible. If the oil seal housing with the installed oil seal is not immediately installed in the machine, it is recommended to cover it with a cloth to prevent foreign matter from adhering to the oil seal. Hands or tools applying lithium-based grease must be clean. 8) Cased oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. The pressure should not be too high, and the speed should be uniform and slow. 9) Mark the machine on which this cased oil seal is installed for tracking purposes, and pay close attention to the entire process.

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