German BIO seals BIO models BIO prices

BIO seals are typical representatives 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 inner-covered skeleton oil seals, 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 for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other parts.

BIO seal principle

Since there is an oil film controlled by the oil seal lip edge 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 of the oil film 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 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 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, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the state of forming an oil film at the sealing surface.

BIO seal applications

Skeleton oil seals are widely used in aviation, automotive, motorcycle, railway, vehicle, ship, home appliance, construction machinery, and other industries. Suitable for sealing rotary motion and reciprocating motion. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Mainly prevents penetration 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.

BIO seal precautions

1) Before designing the groove, please carefully read the instructions for each product series to distinguish whether the product uses an integral groove or a split groove; during the installation of the seal, avoid sharp edges; bore seals installed into integral grooves must use installation tools; designers must consider parameters such as groove dimensional accuracy, surface roughness, and extrusion gap; for details, please refer to the product instructions, diagrams, and dimension tables. 2) Before installing the seal, ensure that there are no impurities or cracks in the sealing groove; apply operating oil to the sealing groove and the seal surface respectively; install the seals gradually in order; avoid sharp edges during installation, align the seal, and avoid twisting and skewing; if it is a split groove, tighten the pressure cover last.

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