Shaft Seals

Radial shaft seals are used to seal rotary engine or transmission components. Different shaft seal designs exist based on fluoroelastomer or PTFE lips. Some seal designs include an additional sealing lip in order to protect the primary sealing area from dust etc.

Automotive shaft seals (e.g. crankshaft and camshaft seals) in particular require ultimate durability under harsh conditions to last a car‘s lifetime. Aggressive lubricants from the engine side plus the protection of the system from outside dirt and dust result in one of the most demanding sealing applications.

The 3M™ Dyneon™ portfolio includes products which enable design engineers to develop state-of-the-art sealing solutions for today‘s demanding applications. Our products for shaft seals provide good processability and superior metal bonding properties.

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Valve Stem Seals

Valve stem seals need to do their job around oscillating parts, ensuring adequate lubrication of the valve without negatively impacting the engine's emissions.

3M™ Dyneon™ Fluoropolymers offer resistance to high temperatures and today's aggressive engine oils & blow-by gases. Optimised sealing and wear behaviour makes them the first choice for valve stem seal applications.

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Shock Absorber Seals

The design of shock absorber seals depends on the system. In traditional oil-filled systems shaft seals completely made of rubber are standard. In modern systems, where a mixture of oil and pressurized gas is used, metal-bonded seals with check valves to control the pressure are the norm.

3M™ Dyneon™ PTFE grades provide optimal sealing capability to prevent leakages of oil and gas used in the shock absorber.

3M™ Dyneon™ Fluoroelastomers are used in high performance shaft seals for e.g. trucks.

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Power Steering Seals

Power steering seals protect the car components from contamination by oil, grease or other liquids while the power steering system does the job of providing assistance to the driver in turning the steering wheel.

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Gear Shift Seals

With their complex combination of mechanical, hydraulic, electrical, and computerized systems, automatic transmissions pose considerable challenges to seal designers. Added to these are increasing warranty demands, higher shaft speeds, higher temperatures and automatic transmissions fluids (ATF)which make the design of shaft seals for use as transmission seals no easy feat.

There are two main types of transmission designs: rear wheel drive and front wheel drive. Rear drive designs typically employ an input seal (also known as the front seal) to prevent leakage of transmission fluid at the interface between the torque converter and the transmission case. Rear drive designs also use an output seal (or rear seal) to prevent leakage past the output shaft, where the transmission connects to the drive shaft.