Page 31 - Catalog spare parts GLYCO for cars

Auto Parts / To avoid any impact on driveability, the engine is cranked very
quickly as soon as the driver engages the clutch, potentially
allowing metal-to-metal contact of the bearings before the
protective hydrodynamic oil film is re-established. This was not

an issue when engines were typically started only a few times a
day, but with a start-stop system these conditions may happen
many hundreds of times a day. The problem is compounded
by the use of modern, less viscous oils with a thinner oil

film, necessary to improve engine efficiency and further
cut emissions. To solve this challenge, Federal-Mogul has
developed an innovative, polymer-coated bearing shell that can
withstand momentary operation without lubrication and is also
ideal for the very high loads imposed by highly boosted engines.
As well as increased impact absorption and wear resistance,
Glyco IROX provides good thermal conductivity to keep the
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bearing cool and good embedability to trap any hard particles
so they don’t damage the bearing journals.
The Glyco IRoX bearing overlay can help increase Federal-Mogul bearing technologies allow engine
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the life of crankshafts and bearing shells by more designers to continue to innovate so that co emis-
2
than five times in the most demanding applications sions can be further reduced and fuel consumption

and drive cycles such as start-stop. Glyco IRoX improved.
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is so effective that it is possible to use aluminium-
based linings instead of the more expensive copper, As perfect examples of Enabling Technologies, they remove
helping to make this Enabling Technology highly barriers to progress. They also show why it is so important to
affordable. replace like-with-like if emissions performance and durability

are to be maintained. Federal-Mogul is one of the first

WITHOUT IROX COATING WITH IROX COATING companies to develop a new range of materials specifically for
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this very demanding application. Using sintering techniques, in
which components are manufactured by squeezing and heating
a blend of metal powders, allows the composition and porosity
of the metals to be precisely tailored to match the performance
characteristics required for the component. The result is
substantially improved durability that enables another step in
CO reduction.
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The majority of diesel engines in service today
will have exhaust gas temperatures around
500-600˚C, but driving up efficiency means

Bearing shells lined with the A-650 Al alloy substrate higher pressure turbocharging and higher com-
after endurance testing on a rig with 80 MPa for 250 h bustion temperatures. Oil oxidises at these
ultra high temperatures, which is a particular
The pictures on the left show the ‘smart’ behaviour of G-488. problem for turbo charger bushings as they
Starting with a soft overlay (left picture), the diffusion process must not only withstand this intense heat, they
in the higher loaded centre of the bearing shell creates an must also manage the loads imposed by the very
extremely durable and wear resistant Tin-Nickel layer, which high rotational speeds of the turbine.
gives the bearing an extended lifetime.

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