450500 seals Germany schnorr model 450500 price

450500 seals are a typical representative of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotary skeleton oil seals and reciprocating skeleton oil seals. Used in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

450500 seal principle

Due to the oil film controlled by the oil seal lip edge between the oil seal and the shaft, this oil film possesses fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes it to form a meniscus at the contact end 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 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 prone to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton 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, also leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep out from within the housing to achieve the state of forming an oil film at the sealing surface.

450500 seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. Suitable for sealing rotary motion and reciprocating motion. Installed in various heavy-duty engines, gearboxes, axles, ships, cylinders, and other locations. Mainly prevents permeation of the sealed medium (gas, liquid) and 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 sealing is required, high-pressure oil seals should be selected (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

450500 seal precautions

1) Obtain a fixed quantity of oil seals. 2) From receipt of the oil seal to assembly, cleanliness must be maintained. 3) Before assembly, perform oil seal inspection; measure whether the dimensions of all parts of the skeleton oil seal match the shaft and cavity dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter dimension with the inner diameter dimension of the oil seal; they must match. The internal dimensions of the cavity must be suitable for the outer diameter width of the oil seal. Check whether the lip of the skeleton oil seal is damaged or deformed, and whether the spring has fallen off or rusted. Prevent the oil seal from being affected by non-flat placement, external squeezing, and impact during transportation, which could destroy its roundness. 4) Perform machining inspection procedures before assembly; measure whether the dimensions of the cavity and shaft parts are correct, especially the internal chamfer, which must not have a slope. The end face machining of the shaft and cavity must be smooth; chamfers must have no damage or burrs. 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 a r angle for the chamfer area. 5) Regarding operational technique, you can use your hand to feel whether it is smooth and truly round. 6) Do not tear open the packaging paper of the skeleton oil seal too early before installation, to prevent debris from adhering to the oil seal surface and being introduced into operation. 7) Before machine installation, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the skeleton oil seal to prevent dry grinding phenomena on the lip during instantaneous shaft startup, which would affect the lip interference fit, and assemble as soon as possible. If the oil seal seat 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) Skeleton oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. Pressure should not be too high, and speed must be uniform and slow. 9) Mark the machine on which this skeleton oil seal is installed for tracking purposes, and pay careful attention to the entire process.

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