German KOMET seals KOMET models KOMET prices

KOMET 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 in transmission systems, and the term also refers to general liquids). They isolate lubricated parts in transmission components from 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 covered by rubber. The term oil seal generally refers to this type of tc skeleton oil seal.

KOMET seal classification

Oil seals are generally divided into monolithic and assembled types. Assembled types allow free combination of the skeleton and lip material, and are generally used for special oil seals. Based on sealing function, characteristics, structural type, operating state, and sealing mechanism, oil seals can be categorized into various forms with different names. However, conventionally, rotary shaft lip seals are called oil seals, while seals used for static and dynamic sealing (generally reciprocating motion) are called 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 covered by rubber. The term oil seal generally refers to this type of tc skeleton oil seal.

KOMET seal materials

Common materials for oil seals include: Nitrile rubber, Fluorocarbon rubber, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat and wear resistance, and is resistant to various lubricating oils, greases, and oil-gas mixtures. Applicable temperature range: -30~120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic oils or gear oils containing extreme pressure additives. It performs stably in gasoline and mineral oils with low aniline points. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, and UV radiation resistance. It is especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic oils containing extreme pressure agents. Suitable for working temperatures in the range of -30~150 degrees Celsius. 3) Fluorocarbon rubber: Resistant to aging, heat, and oil. Suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, it has poor cold resistance and high-temperature wear resistance, and significant permanent compression deformation. Suitable for temperatures from -20~250 degrees Celsius. 4) Silicone rubber: Outstanding high and low-temperature resistance. Can be used long-term at 150 degrees Celsius without performance change; can be used continuously at 200 for 10000h. Maintains its unique elasticity, ozone resistance, and weather resistance in the working temperature range of -70~260. 5) Polytetrafluoroethylene: Outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can work normally in the temperature range of -200~300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluorocarbon rubber are widely used oil seal materials. The former is low-cost, but the latter offers significant improvements in temperature resistance and sealing, though at a higher cost. It still retains some common disadvantages of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena remain relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, one must consider the material's compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft at high speeds. Generally, the lip temperature of an oil seal is 20~50℃ higher than the working medium temperature, which should be noted during material selection. The operating range of an oil seal depends on the material: Nitrile rubber (NBR) is -40~120℃, Acrylic rubber (ACM) is -30~180℃, and Fluorocarbon rubber (FPM) is -25~300℃.

KOMET 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 high-temperature conditions, select polyacrylate, silicone, fluorocarbon, or fluorosilicone rubber. Measures should be taken to reduce the oil temperature in the tank. In low-temperature conditions, select cold-resistant rubber. (3) Pressure: General oil seals have poor pressure resistance and will deform under excessive pressure. Under high-pressure conditions, use pressure-resistant support rings or reinforced pressure-resistant oil seals. 4) Installation eccentricity: Excessive eccentricity between the oil seal and the shaft will degrade sealing performance, especially at high shaft speeds. If eccentricity is excessive, use oil seals with a "W" cross-section. 5) Shaft surface finish directly affects oil seal service life; higher shaft finish results in longer oil seal life. 6) Ensure a certain amount of lubricating oil is present at the oil seal lip. 7) Take special care to prevent dust from entering the oil seal.

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