German DEUBLIN seals DEUBLIN models DEUBLIN prices

DEUBLIN seals are the customary term for general seals; simply put, they seal lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid in transmission systems, and the term also refers to general liquids). They isolate lubricated parts in the transmission from output parts to prevent lubricant leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seal 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.

DEUBLIN seal principle

An oil film controlled by the oil seal lip exists between the oil seal and the shaft, and this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end in contact with air to form a meniscus, 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 it 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, overheating and wear are likely. Therefore, during installation, some oil must be applied to the sealing ring, and the cased oil seal must be kept perpendicular to the shaft axis. If not perpendicular, the sealing lip will wipe the lubricant off the shaft, leading to excessive wear of the sealing lip. During operation, slight seepage of lubricant from the housing is ideal to maintain an oil film at the sealing surface.

DEUBLIN seal function

The function of a cased oil seal is generally to isolate lubricated parts in the transmission from output parts to prevent lubricant leakage. It is typically used on rotating shafts and is a type of rotating shaft lip seal. The casing acts like rebar in concrete components, providing reinforcement and allowing the oil seal to maintain its shape and tension. Based on the casing type, they can be classified as inner-cased oil seals, outer-cased oil seals, and exposed-inner-and-outer-cased oil seals. Cased oil seals are made from high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles and motorcycles on crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other locations. 1) Prevent sand, dust, water vapor, etc., from entering bearings from the outside; 2) Restrict lubricant leakage from bearings. Requirements for oil seals include dimensions (inner diameter, outer diameter, and thickness) that comply with specifications; appropriate elasticity to properly grip the shaft for sealing; heat resistance, wear resistance, high strength, media resistance (to oil or water, etc.), and long service life.

DEUBLIN seal precautions

1) Obtain a fixed quantity of oil seals. 2) Keep clean from receipt to assembly. 3) Before assembly, inspect the oil seal. Measure all parts of the cased oil seal to ensure dimensions match the shaft and housing. Before installing the cased oil seal, clearly compare the shaft diameter with the oil seal's inner diameter; they must match. The internal dimensions of the housing must suit the oil seal's outer diameter width. Check the cased oil seal lip for damage or deformation, and check the spring for detachment or rust. Prevent the oil seal from being stored flat during transport, subjected to external squeezing or impact, which could compromise its roundness. 4) Perform machining inspection procedures before assembly. Measure housing and shaft dimensions for correctness, especially the inner chamfer, which must not have a slope. The shaft and housing end faces must be smoothly machined, with chamfers free of damage and burrs. Clean the assembly area. There must be no burrs, sand, iron filings, or other debris at the shaft insertion point (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use a r angle for the chamfer. 5) Regarding operational technique, use your hand to feel whether the surface 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 seal surface and entering the system. 7) Before machine assembly, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the cased oil seal. This prevents dry grinding of the lip during instantaneous shaft startup, which affects the lip's interference fit, and assembly should be completed promptly. If the oil seal housing with the installed seal is not immediately assembled into the machine, cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying the lithium grease must be clean. 8) Install the cased oil seal flat; do not tilt it. It is recommended to use hydraulic equipment or a sleeve tool for installation. Do not apply excessive pressure; the speed should be uniform and slow. 9) Mark the machine where this cased oil seal is installed for tracking purposes, and carefully monitor the entire process.

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