German Trelleborg seals Trelleborg models Trelleborg prices

Trelleborg 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 in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like rebar 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 rotating 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.

Trelleborg 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 categorized into various forms and 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 oil seals 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.

Trelleborg seal materials

Common materials for oil seals include: Nitrile Rubber, Fluoroelastomer, Silicone Rubber, Acrylate Rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile Rubber (NBR): It has good heat 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 containing extreme pressure agents, suitable for working in the range of -30~150 degrees Celsius. 3) Fluoroelastomer: Aging, heat, and oil resistant, suitable for almost all lubricating oils, fuel oils, and gasoline; does not harden easily in oils containing extreme pressure additives, but has poor cold resistance and high-temperature wear resistance, and 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, maintaining 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, with a decomposition temperature 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 fluoroelastomer 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 in 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 at high speeds. Generally, during operation, the lip temperature is 20~50℃ higher than the working medium temperature, which should be noted when selecting oil seal materials. The working range of an oil seal depends on the material used: Nitrile Rubber (NBR) is -40~120℃, Acrylate Rubber (ACM) is -30~180℃, and Fluoroelastomer (FPM) is -25~300℃.

Trelleborg seal installation precautions

1) During installation, pay close attention to avoiding installation deviations; tighten the pressure cover after aligning the coupling, tighten bolts evenly to prevent tilting of the pressure cover end face, check each point with a feeler gauge, ensuring the error is no greater than 0.05 mm. Check the fit clearance (i.e., concentricity) between the pressure cover and the outer diameter of the shaft or shaft sleeve; it must be uniform around the circumference, check each point with a feeler gauge ensuring the tolerance is no greater than 0.01 mm. 2) Spring compression must be performed according to regulations; excessive or insufficient compression is not allowed, requiring an error of 2.00 mm. Excessive compression increases end-face specific pressure, accelerating end-face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the moving ring, pressing it against the spring should allow it to spring back automatically. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, check for abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also check for scratches on the surfaces of the shaft or shaft sleeve contacting the packing and sealing rings (O rings), flanges, and other components. If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than necessary to the site. Thus, if there are remaining parts after installation, it indicates missed installations; if parts are insufficient, it means parts were assembled in unnecessary places, serving as a self-check during installation.

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