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World's First Plastic Engine Support in the New Mercedes GL Class - On the occasion of the VDI-K Conference “Plastics in Automotive Engineering”, Mannheim, Germany - Ultramid.de / Ultrasim.net
World's First Plastic Engine Support in the New Mercedes GL Class

 

NewswireToday - /newswire/ - Mannheim, Germany, 2013/03/06 - On the occasion of the VDI-K Conference “Plastics in Automotive Engineering”, Mannheim, Germany - Ultramid.de / Ultrasim.net. DE000BASF111

   
 
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Daimler is installing the world's first plastic engine support for the six-cylinder diesel engine used in the new GL Class. Compared to the previous aluminum support, the plastic part offers improved acoustical properties, better thermal insulating characteristics and a definite weight advantage, while being able to withstand the same load. The part, which supports the engine with the aid of the engine mounts, is molded from Ultramid® A3WG10 CR, a highly reinforced specialty polyamide from BASF that has been optimized for high mechanical loads. Joma-Polytec in Bodelshausen assumed responsibility for designing the injection mold and producing the plastic engine support.

Engine support functions and requirements: Static load, continuous load, crash
The torque supports that are already used by various automakers in versions of Ultramid transmit only the tilting moment of the engine. In contrast, engine supports are subject to a permanent load the engine's weight while absorbing in addition the entire engine torque. To date, they have always been made from aluminum.

Acoustics, heat transmission, weight
To replace aluminum in this challenging and also crash-relevant application, the plastic must fulfill demanding mechanical requirements: while Ultramid® A3WG10 CR is very rigid; it was also necessary to demonstrate that it exhibited sufficiently low tendency to creep in the confined space of the engine compartment when subjected to a continuous load. Furthermore, depending on the installation conditions in the engine compartment, the plastic engine support must also withstand high bending moments. The good acoustic characteristics are the primary benefit of the Ultramid engine support over its aluminum counterpart. Thanks to the damping behavior specific to plastic, the new engine support contributes to a more balanced sound.

An additional benefit is that the heat conduction of the plastic is considerably less than that of aluminum. As a consequence, the Ultramid engine support provides better protection from the engine's heat for the natural rubber engine mounts connected to it, increasing their service life. In the context of the CO2 discussion, a weight savings of over 30% for the plastic part versus the aluminum version is an additional plus.

Simulation for optimization of crash and acoustic behavior
The multitude of tests that the plastic part must pass successfully includes the so-called repair crash, which replicates smaller crashes, and the massive offset crash (offset head-on crash). In the first case, the support must remain undamaged; in the second case, it must fail quickly and in a specific manner to prevent the engine's entering the passenger compartment.

In addition to checking these requirements in crash tests, BASF already incorporated both cases into the very early development phase of the complex-shaped engine support through use of its Ultrasim® universal simulation tool and predicted the part's behavior: Ultimate (breaking) loads, strength values under dynamic pulsed loads and crash loads agreed very well with the results of testing and achieved the values required for the aluminum predecessor. It was thus possible to incorporate ribbing to withstand the high loads and satisfy acoustic requirements early on and reduce the number of prototypes.

More information on Ultramid and Ultrasim can be found on ultramid.de | ultrasim.net/.
Information on Ultramid® from BASF: ultraplaste.infopoint[.]basf.com - P: +49 (0) 621 60 78780.

About BASF
BASF (basf.com) is the world’s leading chemical company: The Chemical Company. Its portfolio ranges from chemicals, plastics, performance products and crop protection products to oil and gas. We combine economic success with environmental protection and social responsibility. Through science and innovation, we enable our customers in nearly every industry to meet the current and future needs of society. Our products and solutions contribute to conserving resources, ensuring nutrition and improving quality of life. We have summed up this contribution in our corporate purpose: We create chemistry for a sustainable future. BASF posted sales of €78.7 billion in 2012 and had more than 113,000 employees as of the end of the year. BASF shares are traded on the stock exchanges in Frankfurt (BAS), London (BFA) and Zurich (AN).

 
 
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Written by / Agency / Source: BASF

 
 

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World's First Plastic Engine Support in the New Mercedes GL Class

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BASF |
Publisher Contact: Dr. Sabine Philipp - BASF.com 
+49 621 60-43348 sabine.philipp[.]basf.com
 
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