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News

Harry S.P.A. exploits strength, quietness of Stanyl PA46 for self-propelled lawnmowler transmission gears

DSM Coating Resins : 13 April, 2005  (New Product)
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.
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, 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.
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