PA46 FOR DEMANDING TIMING CHAIN TENSIONER APPLICATION ON PORSCHE CAYENNE ENGINE

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PA46 FOR DEMANDING TIMING CHAIN TENSIONER APPLICATION ON PORSCHE CAYENNE ENGINE
20 October 2004 - DSM Engineering Plastics

Iwis, a major European supplier of automotive chain systems as well as chains and components for industrial applications, uses two grades of Stanyl (PA46) from DSM Engineering Plastics for timing chain tensioners on the Porsche Cayenne engine.

One Stanyl grade with outstanding wear resistance, TW341, is used for the top layer that presses on the timing chain.

Stanyl TW241F10, the second grade, exhibits high stiffness, making it ideal for the base of the tensioner.

“By using an innovative, two-part design, IWIS maximises the design and processing advantages of thermoplastics in parts that traditionally were metal,” said Ton Vet, Application Development Manager for Stanyl. “In the IWIS design, the tensioner base can be made as stiff as needed by using high-stiffness materials. At the same time, the top layer can offer a non-abrasive surface to the chain for maximum life with minimum wear and friction.”

Stanyl TW 341 is a PA 46 with excellent wear characteristics combined with good oil resistance at engine operating temperatures (140C).

Stanyl TW 241F10 is a 50% glass-filled PA46 with outstanding oil resistance, high modulus and stiffness, high resistance to fatigue, and low creep at maximum operating temperatures.

As thermoplastics, both Stanyl grades offer design freedom to the timing chain designer, important in applications such as this, where the unusual length of the timing chain requires continuous management of the chain’s shape and tightness.
The stiff tensioner base is moulded in its final shape, complete with the right curvature for chain management. All mounting and pivot points as well as reinforcing ribs are precisely located for rapid assembly. The top layer comes from the mould with a smooth finish, complete with ears to guide the chain.

“The result is an assembly with extraordinary wear resistance in a next-generation engine subjected to high loads,” said Dr Thomas Fink, R and D at IWIS.

IWIS worked with DSM Engineering Plastics during development of the tensioner parts, as DSM Engineering Plastics has more than 12 years experience in designing parts for the automotive industry.

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About: DSM Engineering Plastics
DSM Engineering Plastics is a business group forming part of DSM's Performance Materials cluster. DSM EP is a global supplier of Stanyl PA46 and Akulon 6 and 66 polyamides, Arnitel TPE-E, Arnite PBT and PET polyesters, Xantar polycarbonate, Yparex extrudable adhesive resins, and Stamylan UH Ultra High Molecular Weight PE. These materials are used in technical components for electrical appliances, electronic equipment and cars, in barrier packaging films as well as in many mechanical and extrusion applications. The business group had annual sales of EUR 566 million in 2003. With Stanyl, it is the global market leader in high heat polyamides.

Stanyl is a family of heat-resistant polyamides from DSM Engineering Plastics. Stanyl’s high crystallinity (70% versus 50% for conventional PA66) results in high heat distortion temperatures of 190C for unreinforced grades, up to 290C for reinforced. Stanyl grades are used in automotive clutch plates, charge air coolers, chain tensioners; electrical components including motor frames and end laminates, circuit breakers, controls and connectors; and home and power tool components, including heat shields and heat-resistant utensils.

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