Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


DuPont™ Hytrel® thermoplastic elastomer helps resolve “baffling” design challenge

A unique approach to integrating a sealing and baffle function in General Motors’ new 6T40 and 6T45 transversely mounted 6-speed automatic transmissions helps condense packaging space and enable better clutch and transmission durability.

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.

Photo: DuPont
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
Further information:

More articles from Automotive Engineering:

nachricht New algorithm for optimized stability of planar-rod objects
11.08.2016 | Institute of Science and Technology Austria

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

All articles from Automotive Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Light-driven atomic rotations excite magnetic waves

Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion

Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...

Im Focus: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

First-time reconstruction of infectious bat influenza viruses

25.10.2016 | Life Sciences

Novel method to benchmark and improve the performance of protein measumeasurement techniques

25.10.2016 | Life Sciences

Amazon rain helps make more rain

25.10.2016 | Life Sciences

More VideoLinks >>>