The two new transmissions deliver power to a wide range of vehicles available globally from GM, including the 2008 Chevrolet Malibu, Daewoo Tosca and Buick LaCrosse for the Chinese market.
The integrated baffle and seal lip assembly, made of DuPont™ Hytrel® thermoplastic polyester elastomer, is located in the torque transfer case and is designed to reduce oil aeration, provide a seal that limits fluid from flooding the chain while ultimately enabling transmission fluid fill for life.
The integrated baffle and seal lip assembly, made of DuPont™ Hytrel® thermoplastic polyester elastomer, is located in the torque transfer case and is designed to reduce oil aeration, provide a seal that limits fluid from flooding the chain while ultimately enabling transmission fluid fill for life. The one-piece, flexible component significantly reduces overall cost because it avoids the use of costly multi-step production and assembly processes, which were typically metal stampings or plastic carriers with a rubber bead.
“We started a couple years ago and worked very closely with GM to optimise the material and process for this design so that they could cost-effectively realise the full benefits of the innovation,” said Dino Tres, DuPont Automotive development programs manager. “Hytrel® is key. Even though it’s not typically considered for transmission applications, it proved to offer the right balance of flexibility and stiffness despite temperature extremes to fit the complex geometries of the transfer case while resisting swell when exposed to oils, aliphatics and aromatic solvents.”
Two years in development saw tooling iterations and material upgrades to optimize performance for service temperatures that cycle between -40°C to +140°C. The team extensively used the Troy-based DuPont Automotive Application Development Center to test materials, various processes and tools. Now in production, the part is manufactured by Chunil Engineering in Korea and CWB Group in China.
“The success of this design on the 6T40 program was followed quickly by application of this design on the 6T45 program, which recently went into production,” said Jatin Desai, General Motors Powertrain transmission structural component global team leader. “This generation offers improved performance, yet still packages the 6-speed into the space of a 4-speed.”
The DuPont Engineering Polymers business manufactures and sells Crastin® PBT and Rynite® PET thermoplastic polyester resins, Delrin® acetal resins, Hytrel® thermoplastic polyester elastomers, DuPont™ ETPV engineering thermoplastic vulcanizates, Minlon® mineral reinforced nylon resins, Thermx® PCT polycyclohexylene dimethyl terephthalate, Tynex® filaments, Vespel® parts and shapes, Zenite® LCP liquid crystal polymers, Zytel® nylon resins and Zytel® HTN high-performance polyamides. These products serve global markets in the aerospace, appliance, automotive, consumer, electrical, electronic, healthcare, industrial, sporting goods and many other diversified industries.
DuPont is a science-based products and services company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture and food; building and construction; communications; and transportation.
The DuPont Oval, DuPont™, The miracles of science™, and Hytrel® are registered trademarks or trademarks of E.I. du Pont de Nemours and Company or its affiliates.
Horst Ulrich Reimer | Du Pont
Improvement of the operating range and increasing of the reliability of integrated circuits
09.11.2016 | Technologie Lizenz-Büro (TLB) der Baden-Württembergischen Hochschulen GmbH
New algorithm for optimized stability of planar-rod objects
11.08.2016 | Institute of Science and Technology Austria
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine