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Bonded Seal

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Sealing under high pressure is best achieved with a so-called bonded seal - a polymer bonded to the inside of a metal ring. The metal ensures the dimensional stability of the sealing surface, the polymer lip provides the sealing function. Now add aggressive chemicals or extreme temperatures to the mix and your sealing application calls for 3M™ Dyneon™ Fluoropolymers. We'll introduce you to a choice of applications for bonded fluoropolymer seals below.

Shaft Seal

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) especially require ultimate durability for a car‘s lifetime under harsh conditions. 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 Dyneon Product Portfolio includes products which enable design engineers to develop state-of-the-art sealing solutions for today‘s demanding applications. Dyneon products for shaft seal application provide good processability and superior metal bonding properties.

You'll find information about the product generally recommended for use in this application here:

 

Valve Stem Seal

In contrary to the seals for rotating shafts, e.g. crankshaft seals, valve stem seals need to do their job around oscillating parts.

While ensuring adequate lubrification of the valve, the seal has to ensure that the proper amount of oil stays on the valve without negatively influencing the engine‘s emissions.

3M™ Dyneon™ Fluoropolymers offer a well-balanced performance profile regarding resistance to high temperatures and today‘s engine oils. Additionally the optimised sealing and wear behaviour makes them the first choice for valve stem seal applications.

You'll find information about the product generally recommended for use in this application here:

 

Shock Absorber Seal

Depending on the concept of the shock absorbers, the design of the seals can differ. In traditional oil-filled systems shaft seals completely made of rubber prevail. In modern systems, where a mixture of oil and pressurised gas are used, metal bonded seals with check valves to control the pressure can be found.

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

You'll find information about the product generally recommended for use in this application here:

 

Power Steering Seal

The power steering system provides mechanical or electronic assistance to the driver for turning the steering wheel.

Often an electric motor operates the steering pump which provides hydraulic pressure and supports the steering system. This is converted into mechanical force which helps the driver to push the car´s wheels in the needed direction.

Power steering seals protect the car components from any kind of contamination with oil, grease or other liquids.

You'll find information about the products generally recommended for seals which provide the needed protection here:

 

Gear Shift Seal

With their complex combination of mechanical, hydraulic, electrical, and computerised systems, automatic transmissions pose considerable challenges to seal designers. These inherent complexities in combination with increasing warranty demands, higher shaft speeds, and higher temperatures make the design of shaft seals for use as transmission seals no easy feat.

Generally speaking, 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 (otherwise known as the rear seal) to prevent leakage past the output shaft (where the transmission connects to the drive shaft).

You'll find information about the product generally recommended for seals which provide the needed protection here:

 

 

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