Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Spring element made of low-emission DuPont™ Delrin® acts as buffer during steering column adjustment

08.05.2012
Buffer-stops made of the low-emission grade DuPont™ Delrin® 100PE acetal resin cushion the impact when mechanically-adjustable steering columns, from ThyssenKrupp Presta of Eschen, Liechtenstein, reach full horizontal adjustment.
Decisive factors in its specification were the material's compliance with stringent emission levels demanded by some of Germany's automotive OEMs for interior applications and its steel-like springiness. The material is also characterized by its vibration damping effect, its high notched impact strength and very good sliding properties.

The buffer-stop, injection-molded in Delrin® 100PE, takes up very little installation space with its 14 mm ´ 9 mm ´ 6 mm dimensions. Held by a rivet, it slides during adjustment of the steering column on metal guide rails until they reach their limit at the end of the adjustment range. Although the associated jolt may in some cases be hard, two small springs on either side of the buffer-stop are enough - thanks to the high stiffness and elasticity of the material - to cushion the impact both mechanically and acoustically. Moreover, as a direct benefit of the excellent sliding properties of Delrin® acetal resin, the buffer-stop will continue to move easily, softly and virtually inaudibly on the guide rails for the entire lifetime of the vehicle.

According to Ingo Weise, project buyer at ThyssenKrupp Presta: "Acetal is an established material for damping elements used in steering columns. At ThyssenKrupp Presta we have often used Delrin® 100P for similar parts in earlier designs where it met our requirements. In this particular case, however, we needed to meet especially strict emission levels. We therefore worked with DuPont on finding an alternative, including carrying out required testing. This ultimately resulted in us specifying Delrin® 100PE".

Martin Elmer, marketing manager for injection molding at Huber+Suhner, the Swiss-based supplier of the buffer-stops, adds: "We produce these high-precision parts, that are characterized by their variable wall thicknesses, in 16-cavity hot runner molds and keep within a tolerance of just ±0.05mm. Because the processing requirements of the new, low-emission Delrin® 100PE are almost identical to those of the 100P grade, we were able to adapt our production in the shortest of time and without compromising quality, all with the help of the experienced application technicians from DuPont".

Based on the direct and simple changeover in production, as well as the very positive experience to date during serial production, ThyssenKrupp Presta is planning to use Delrin® 100PE for further automotive applications of a similar nature.

The combination of high elasticity and stiffness as well as excellent sliding properties make Delrin® acetal homopolymers a material of choice for applications requiring low weight and where elements are required to absorb high forces, levels of deformation and impact, as well as to continuously move both smoothly and quietly. According to Hans-Hermann Kirner, material development leader for vehicle interiors at DuPont: "Gears and adjustment mechanisms are ideal applications for Delrin®. In view of the strict limits with regard to the emission of volatile particles, Delrin® 100PE is very suitable applications located within the vehicle’s interior. It is able to meet the demands of the global automotive industry with regard to emissions of volatile substances during both processing and use. The same applies to the higher flow grades Delrin® 300PE und 500PE. Tests conducted by SGS Institut Fresenius of Taunusstein, Germany, in accordance with VDA 275, revealed emissions of below 2 mg/kg for all three grades, whereas their strength, stiffness, impact resistance and resistance to creep and fatigue are the same as standard grades". DuPont has also recently introduced Delrin® 127UVE, 327UVE and 527UVE, which are all UV-stabilized versions of its low-emission acetal resin for automotive interior applications.

ThyssenKrupp Presta, Steering Division, is one of the world's largest producers of steering columns and steering systems, ranging from non-adjustable models to manually-operated height- and distance-adjustment systems for mid-class vehicles in Europe, America and Asia and electronically-adjustable models for top-range vehicles. At the end of 2007, the company gained a series production order for the supply of steering columns for the BMW 1, 3 and X3 series, as well as the development order for the steering control of other model ranges.

HUBER+SUHNER Gruppe, headquartered in Switzerland and with 24 companies and numerous authorised agents in over 60 countries around the world, is an internationally-leading supplier of components and systems for electrical and optical connectivity for the telecommunications, industrial applications and transportation industries.

DuPont Performance Polymers is committed to working with customers throughout the world to develop new products, components and systems that help reduce dependence on fossil fuels and protect people and the environment. With more than 40 manufacturing, development and research centers throughout the world, DuPont Performance Polymers uses the industry’s broadest portfolio of plastics, elastomers, renewably sourced polymers, filaments and high-performance parts and shapes to deliver cost-effective solutions to customers in aerospace, automotive, consumer, electrical, electronic, industrial, sporting goods and other diversified industries.

DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802. The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment. For additional information about DuPont and its commitment to inclusive innovation, please visit www.dupont.com.

The DuPont Oval, DuPontÔ, The miracles of scienceÔ and Delrin® are trademarks or registered trademarks of E.I. Du Pont de Nemours and Company or its affiliates.

PP-EU-2012-01

This press release is based on information provided by:
ThyssenKrupp Presta, Steering Division
FL-9492 Eschen, Liechtenstein

Contact: Ingo Weise
ingo.weise@thyssenkrupp.com

and

Huber+Suhner AG
CH-9100 Herisau, Schweiz
Contact: Martin Elmer
martin.elmer@hubersuhner.com

Contact:
Rémi Daneyrole
Tel.: +41 (0)22 717 54 19
Fax: +41 (0)22 580 22 45
Remi.daneyrole@dupont.com

Rémi Daneyrole | DuPont
Further information:
http://www.dupont.com
http://www.thyssenkrupp-presta.com
http://www.hubersuhner.com

More articles from Automotive Engineering:

nachricht Automated driving: Steering without limits
05.02.2016 | FZI Forschungszentrum Informatik am Karlsruher Institut für Technologie

nachricht Pioneering joining technology for high performance hybrid automotive parts
18.12.2015 | Fraunhofer-Institut für Lasertechnik ILT

All articles from Automotive Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The most accurate optical single-ion clock worldwide

Atomic clock experts from the Physikalisch-Technische Bundesanstalt (PTB) are the first research group in the world to have built an optical single-ion clock which attains an accuracy which had only been predicted theoretically so far. Their optical ytterbium clock achieved a relative systematic measurement uncertainty of 3 E-18. The results have been published in the current issue of the scientific journal "Physical Review Letters".

Atomic clock experts from the Physikalisch-Technische Bundesanstalt (PTB) are the first research group in the world to have built an optical single-ion clock...

Im Focus: Goodbye ground control: autonomous nanosatellites

The University of Würzburg has two new space projects in the pipeline which are concerned with the observation of planets and autonomous fault correction aboard satellites. The German Federal Ministry of Economic Affairs and Energy funds the projects with around 1.6 million euros.

Detecting tornadoes that sweep across Mars. Discovering meteors that fall to Earth. Investigating strange lightning that flashes from Earth's atmosphere into...

Im Focus: Flow phenomena on solid surfaces: Physicists highlight key role played by boundary layer velocity

Physicists from Saarland University and the ESPCI in Paris have shown how liquids on solid surfaces can be made to slide over the surface a bit like a bobsleigh on ice. The key is to apply a coating at the boundary between the liquid and the surface that induces the liquid to slip. This results in an increase in the average flow velocity of the liquid and its throughput. This was demonstrated by studying the behaviour of droplets on surfaces with different coatings as they evolved into the equilibrium state. The results could prove useful in optimizing industrial processes, such as the extrusion of plastics.

The study has been published in the respected academic journal PNAS (Proceedings of the National Academy of Sciences of the United States of America).

Im Focus: New study: How stable is the West Antarctic Ice Sheet?

Exceeding critical temperature limits in the Southern Ocean may cause the collapse of ice sheets and a sharp rise in sea levels

A future warming of the Southern Ocean caused by rising greenhouse gas concentrations in the atmosphere may severely disrupt the stability of the West...

Im Focus: Superconductivity: footballs with no resistance

Indications of light-induced lossless electricity transmission in fullerenes contribute to the search for superconducting materials for practical applications.

Superconductors have long been confined to niche applications, due to the fact that the highest temperature at which even the best of these materials becomes...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Travel grants available: Meet the world’s most proficient mathematicians and computer scientists

09.02.2016 | Event News

AKL’16: Experience Laser Technology Live in Europe´s Largest Laser Application Center!

02.02.2016 | Event News

From intelligent knee braces to anti-theft backpacks

26.01.2016 | Event News

 
Latest News

About injured hearts that grow back - Heart regeneration mechanism in zebrafish revealed

10.02.2016 | Life Sciences

The most accurate optical single-ion clock worldwide

10.02.2016 | Earth Sciences

Absorbing acoustics with soundless spirals

10.02.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>