Piston and cylinder assemblies
AssigneeAssociated Engineering Italy S.p.A.
InventorsLudovico Bruni, Pierantonio Iguera
Life of this patent
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Abstract
In a piston and cylinder assembly in which the piston is made of an aluminium alloy, the wall of the cylinder contacted by the piston is formed of a hyper-eutectic silicon aluminium alloy having the composition by weight percentages of silicon (Si) 12-20%; copper (Cu) 0.5-5%; iron (Fe) 1.0-6%; magnesium (Mg) 0.2-2%; nickel (Ni) 0.5-4%; and optionally manganese (Mn) 0-5%; cobalt (Co) 0-3%; chromium (Cr) 0-3%; tin (Sn) 0-8%; titanium (Ti) 0-0.3%; lead (Pb) 0-5%; and molybdenum (Mo) 0-5%, the remainder being aluminium.
Claims11
A piston and cylinder assembly in which the piston is made of an aluminium alloy characterised in that after any temporary running-in coating on the wall of the cylinder has been worn away, the piston is in direct running contact with a cylinder wall formed of a hypereutectic silicon aluminium alloy consisting essentially of the following in percentages by weight:
- silicon 12-20%;
- copper 0.5-5%;
- iron 1.0-6%;
- magnesium 0.2-2%;
- nickel 0.5-4%;
- and optionally manganese 0-5%;
- cobalt 0-3%;
- chromium 0-3%;
- tin 0-8%;
- titanium 0-0.3%;
- lead 0-5%;
- and molybdenum 0-5%, the remainder being aluminium.
A piston and cylinder assembly according to any preceding claim characterised in that the composition of the aluminium alloy of the piston consists essentially of 11.46% of silicon;
- 1% nickel;
- 1-1.13% copper;
- 0.91% magnesium and 0.17% iron, the remainder being aluminium.
Dependencies are inferred from the claim text.