German compact seals compact models compact prices

compact seals are typical representatives 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 within 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. Based on 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. Based on skeleton type, they can be divided into inner-covered skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used in locations such as gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, and axles.

compact seal classification

Oil seals are generally divided into monolithic types and assembled types; assembled types allow free combination of the skeleton and lip material, generally used for special oil seals. Based on sealing function, characteristics, structural type, operating state, and sealing mechanism, oil seals can be divided into various forms with different names, but conventionally, rotating shaft lip seals are called oil seals, while static seals and dynamic seals (generally reciprocating motion) are called sealing elements. The representative form of an oil seal is the TC oil seal, which is a rubber-fully covered double-lip oil seal with a self-tightening spring; the term "oil seal" commonly refers to this type of tc skeleton oil seal.

compact seal materials

Common materials for oil seals include: nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat resistance and wear resistance, resists various lubricating oils, greases, oil-gas mixtures, etc., applicable temperature range -30~120 degrees Celsius, but cannot be used in phosphate ester hydraulic oils and gear oils containing extreme pressure additives; it performs stably in gasoline and low-aniline-point mineral oils. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, UV radiation resistance, especially resistant to lubricating oils, gear oils, motor oils, engine oils, petroleum-based hydraulic oils, etc., containing extreme pressure agents, suitable for operation in the -30~150 degrees Celsius range. 3) Fluororubber: Aging resistance, heat resistance, oil resistance, suitable for almost all lubricating oils, fuel oils, gasoline, does not harden easily in oils containing extreme pressure additives, but has poor cold resistance and high-temperature wear resistance, significant permanent compression set, suitable for temperatures -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 within the working temperature range of -70~260. 5) Polytetrafluoroethylene: Outstanding chemical stability, thermal stability, friction reduction, and self-lubrication, with a decomposition temperature above 400. Therefore, it can operate normally within 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 fluororubber are widely used oil seal materials; the former is low-cost, while the latter offers significant improvements in temperature resistance and sealing, but is higher cost and still retains some negative commonalities 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 during high-speed rotation. Generally, when an oil seal is operating, the lip temperature is 20~50℃ higher than the working medium temperature, which should be noted when selecting oil seal materials. The operating range of an oil seal depends on the material used: for nitrile rubber (NBR), it is -40~120℃; for acrylic rubber (ACM), -30~180℃; for fluororubber (FPM), -25~300℃.

compact seal functions and applications

Engine: Crankshaft -- front and rear crankshaft oil seals; Valve -- valve oil seals (engine repair kit o O-rings) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); Camshaft -- camshaft oil seal; Transmission: Transmission -- front and rear transmission oil seals; Shift lever oil seal (transmission repair kit o O-rings) (Transfer case -- front and rear transfer case oil seals); Rear Axle: Half-shaft -- rear half-shaft oil seal; Differential -- (front/rear) pinion oil seal; Rear wheel oil seal; Front wheel oil seal; Steering gear oil seal (steering gear repair kit o O-rings); Power steering booster oil seal (front half-shaft oil seal). Oil seals are required wherever there is liquid lubricating oil inside a rotating housing that connects to the exterior. Some are made of rubber, some of metal, but most are steel-reinforced rubber, such as rear crankshaft oil seals, front and rear transmission oil seals, left and right half-shaft oil seals, front main reducer oil seals, and air compressor crankshaft oil seals.

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