Freudenberg-NOK's Low Load Seal Design Improves Sealing Performance in General Motors Engines

Freudenberg-NOK's Low Load Seal Design Improves Sealing Performance in General
                                Motors Engines

Customizable offset seals offer simple assembly and component stress reduction

PR Newswire

PLYMOUTH, Mich., Aug. 12, 2014

PLYMOUTH, Mich., Aug. 12, 2014 /PRNewswire/ -- Freudenberg-NOK Sealing
Technologies (Freudenberg-NOK) is a global leader in material innovations and
custom-engineered sealing solutions.

So it was only natural that when General Motors Corp. (GM) was searching for a
static radial seal for several engine applications, the auto company
ultimately selected Freudenberg-NOK's ergonomically engineered, low load seal
technology. Today that partnership has grown into additional applications
across GM's highest volume four-cylinder and V-6 engines.

Freudenberg-NOK's low load seal, a type of offset seal that can be easily
installed and removed by hand, reduces installation force by more than 70
percent. GM adopted the design for several engine applications including a
spark plug tube, vacuum pump seal and two solenoid-to-cam cover seals.

"Offset seals control independent loading on mated components and can be
easily assembled or removed, allowing options for serviceability," said David
Pehlman, engineering manager, Freudenberg-NOK. "The design allows for the use
of dissimilar mated materials and reduces stress on components, which
contributes to increased durability."

The basic premise of low load sealing is that instead of squeezing an O-ring
bonded to a metal case, rubber is trapped in various shapes and allowed to
move a little more, which creates a lower assembly force and more improved

After validation tests were completed, GM adopted the design for both the
spark plug tube seal and mechanical vacuum pump seal. Freudenberg-NOK
engineered the seals to GM material specifications and they now appear on some
of the auto manufacturer's latest 2014 model offerings including the Cadillac
CTS Sedan, GMC Acadia and Chevrolet Malibu. While the design is ideal for
engine applications, it is not limited to engine alone.

"The seal's lip design can be applied to other static radial offset
applications. It reduces contact pressure, which consequently increases the
life cycle of the seal and the components," said John Wagner, staff design
engineer, Freudenberg-NOK and inventor of the low lead seal technology. "It's
a practical, user-friendly solution, particularly when both improved
ergonomics and sealing are desired."

Wagner's patent pending innovation took him through various design renderings
before arriving at the solution. His work continues to generate new
applications and sealing approaches for GM and Freudenberg-NOK alike.

About Freudenberg-NOK Sealing Technologies
Freudenberg-NOK Sealing Technologies is the Americas joint venture between
Freudenberg and Co. in Germany and NOK Corp. in Japan. Freudenberg-NOK is a
leading producer of advanced sealing technologies for a variety of markets
including: aerospace; agriculture; appliance; automotive; construction; diesel
engine; energy; food and beverage; heavy industry; and pharmaceutical. Founded
in 1989 under the legal name Freudenberg-NOK General Partnership,
Freudenberg-NOK is headquartered in Plymouth, Mich. and operates more than 20
facilities across the Americas. For additional information, please visit

SOURCE Freudenberg-NOK Sealing Technologies

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