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RMG seals are a typical representative 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 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 as a dust shield, preventing external dust, impurities, etc., from entering the machine interior. Based on skeleton type, they can be divided into internally enclosed skeleton oil seals, externally 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 for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

RMG seal principle

A mechanical seal is a shaft sealing device that achieves leak prevention by maintaining contact between one or several pairs of end faces sliding relative to each other perpendicular to the axis, under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, supplemented by auxiliary seals. Common mechanical seal structures consist of components such as a stationary ring (static ring), rotating ring (dynamic ring), elastic element spring seat, set screws, rotating ring auxiliary O-ring, and stationary ring auxiliary O-ring. Anti-rotation pins are fixed to the gland to prevent the stationary ring from rotating. The rotating ring and stationary ring may also be referred to as compensation rings or non-compensation rings, depending on whether they possess axial compensation capability.

RMG seal system composition

1) Seal chamber: In the past, seal chambers housing mechanical seals were stuffing boxes designed for soft packing seals. They are unsuitable for housing mechanical seals, not only because the dimensions are too small and the clearances too narrow, but also because the simple cylindrical shape is inappropriate. Standards for enlarged mechanical seal chambers have been established abroad. Additionally, companies such as Durametallic in the United States and the Fluid Engineering Study Group in the United Kingdom are researching rational mechanical seal chambers. Their shapes should not only facilitate fluid flow and heat dissipation but also aid in the removal of solid particles, creating a favorable environment for the seal. 2) Volatile organic compound (VOC) emission control system: In the past, attention was focused only on eliminating visible fluid leaks, neglecting the control of invisible volatile emissions, resulting in environmental pollution and hazards to equipment and personnel. Abroad, organizations such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States have established guidelines for controlling volatile emissions from rotating machinery, compressors, and screw systems with mechanical seals, including SP-30 (1994), SP-32 (1990), and SP-33 (1991). SP-30 is implemented in three stages. It clearly defines blocking fluids and buffer fluids, clarifying erroneous and confused concepts. A blocking fluid is introduced between dual seals to completely block process fluid from leaking into the surrounding environment. The pressure of the blocking fluid is always higher than the pressure of the sealed process fluid. A buffer fluid is used between dual seals as a lubricant or buffer; the buffer fluid pressure is always lower than the pressure of the sealed process fluid. 3) Auxiliary system integration: Mechanical seal auxiliary systems require integration of cooling, heating, flushing, and other systems; pump circulation needs optimization, and issues such as condition monitoring systems are being studied and resolved. Integration of auxiliary systems is specified in the API-682 standard. 4) Gas blocking seal system: In the past, liquid-blocking-liquid or liquid-blocking-gas configurations were commonly used in blocking seal systems. To simplify bulky blocking liquid systems, blocking gas is now used to block liquids or gases. Gas blocking seal systems may employ spiral groove gas seals with blocking gas, floating bushings with blocking gas, etc., to block gases and liquids.

RMG seal functions and applications

Engine: Crankshaft - front and rear crankshaft oil seals; Valve - valve stem 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 rotating housings contain liquid lubricants and connect to the external environment. 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, final drive front oil seals, and air compressor crankshaft oil seals.

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