DSM Engineering Materials

HARRY S.P.A. EXPLOITS STRENGTH, QUIETNESS OF STANYL® PA46 FOR SELF-PROPELLED LAWNMOWER TRANSMISSION GEARS

With a dual objective of quiet, dependable operation and manufacturing cost reduction, Italian lawn and garden equipment maker Harry S.P.A. is using a self-propelled lawnmower transmission gear set made of Stanyl® TW200F6, a 30% glass-fibre reinforced polyamide 4,6 (PA46) from DSM Engineering Plastics.

Stanyl provides the superior wear and friction characteristics, mechanical and heat endurance required to handle the engagement forces and the transfer of energy from the engine to the mower’s driven wheel. At the same time, Stanyl helps reduce noise, especially important for environmentally friendly and extra-quiet designs from Harry. Because gear surfaces and other complex geometry are cost effectively produced by injection moulding, the Stanyl gear set does not require the machining, polishing, or fitting required by metal counterparts.

The design incorporates three Stanyl parts: a driven gear, a mechanical clutch, and a shifting fork that actuates the clutch. The transmission itself is a positive drive to one rear wheel and is engaged by the user while the engine is running. The forces generated during rapid engagement are high, and Stanyl’s strength and relatively low coefficient of friction provide long life for the assembly. “We were able to realise a design that’s both long-lasting and economical with DSM's materials,” said Mr. Figini, Technical Manager at Harry. “Metal gearing proved to be too noisy and involve too many manufacturing steps.”

“Stanyl’s strengths were a good fit for the Harry application,” said Marco Vincre, Account Manager, Stanyl, DSM Italy. “The strength of Stanyl especially made it a good fit for this mechanically demanding use.”

Stanyl grade TW200F6 is one of the Stanyl family of heat-resistant polyamide moulding compounds, produced and marketed exclusively by DSM and available worldwide. Stanyl is used in demanding applications in the automotive and electrical and electronics industries, as well as many other applications. Stanyl is offered in a wide variety of grades including high- flow, abrasion-resistant, and unfilled (non-reinforced), as well as grades containing glass and other fibers, minerals, lubricants, impact modifiers and/or flame retardants.

The higher crystallinity and a faster rate of crystallization give Stanyl a technical edge over such engineering plastics as PA6, PA66, polyesters, and other high heat-resistant resins such as semi-aromatic polyamides (PPAs), PPS and LCPs. Compared to these, Stanyl grades show better heat resistance, mechanical properties at elevated temperatures, wear and friction behaviour and, with faster cycle time and increased flowability, improved processing economics. A dedicated staff of DSM specialists provides technical support in design, moulding, and material selection of Stanyl.

Akulon®, Arnite®, Arnitel®, Stanyl®, Stamylan® UH, Xantar® and Yparex® are registered trademarks of DSM Engineering Plastics.

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Notes for editors


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 624 million in 2004. With Stanyl, it is the global market leader in high-heat polyamides.

Related images

A self-propelled lawnmower transmission gear set made of Stanyl® TW200F6, a 30% glass-fibre reinforced polyamide 4,6 (PA46) from DSM Engineering Plastics.

 

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Thea Trilsbeek
DSM Engineering Materials

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thea.trilsbeek@​dsm.com

Cora Zaaijer
EMG

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czaaijer@​emg.nl

 

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