450300 seals Germany schnorr model 450300 price

450300 seals are a typical representative of oil seals; generally, the term "oil seal" 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 locations.

450300 seal principle

Due to the oil film controlled by the oil seal lip edge existing 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 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 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 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, which will also lead 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.

450300 seal function

The function of a skeleton oil seal is generally to isolate components requiring lubrication in transmission parts from output components, preventing lubricating oil leakage; it is typically used on rotating shafts and is a type of rotating shaft lip seal. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to skeleton type, they can be divided into inner skeleton oil seals, outer skeleton oil seals, and inner/outer exposed skeleton oil seals. Skeleton oil seals are made from high-quality nitrile rubber and steel plates, offering stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other locations. 1) Prevent sand, dust, water vapor, etc., from invading bearings from the outside; 2) Restrict lubricating oil in bearings from leaking out. Requirements for oil seals include that dimensions (inner diameter, outer diameter, and thickness) must comply with regulations; appropriate elasticity is required to properly grip the shaft and achieve a sealing effect; they must be heat-resistant, wear-resistant, have good strength, be resistant to media (oil or water, etc.), and have a long service life.

450300 seal precautions

1) Shaft speed: Due to design and structural reasons, high-speed shafts should use high-speed oil seals, and low-speed shafts should use low-speed oil seals; low-speed oil seals must not be used on high-speed shafts, and vice versa. 2) Ambient temperature: In cases of higher operating temperatures, polyacrylate or silicone, fluorine, or silicone-fluorine rubber should be selected. Measures should be taken to reduce the oil temperature in the oil tank. In cases of lower operating temperatures, cold-resistant rubber should be selected. (3) Pressure: General oil seals have poor pressure-bearing capacity; excessive pressure will cause the oil seal to deform. Under conditions of excessive pressure, pressure-resistant support rings or reinforced pressure-resistant oil seals should be used. 4) Degree of eccentricity in installation: If the eccentricity is too large when the oil seal mates with the shaft, its sealing performance will deteriorate, which is particularly severe at high shaft speeds. If the eccentricity is too large, oil seals with a "W" shaped cross-section can be used. 5) Shaft surface finish directly affects the service life of the oil seal; i.e., higher shaft surface finish results in longer oil seal service life. 6) Note that a certain amount of lubricating oil should be present at the lip of the oil seal. 7) Special attention should be paid to preventing dust from entering the oil seal.

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