Patent US4297976A successfully refreshed from Google Patents.
US4297976A
Expired / Lapsed
US
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Piston and cylinder assemblies
Assignee: Associated Engineering Italy SpA
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Filing: 1979-05-31
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Granted: 1981-11-03
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Expires: 1999-05-31
Abstract
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.
Inventors
- 👤 Ludovico Bruni
- 👤 Pierantonio Iguera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:37
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/02; F; F02; F02F; F02F7/00; F02F7/0085; F02F2007/009; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
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.
Claim 2
Dependent Claim
91 words
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.
Claim 3
Dependent Claim
51 words
A piston and cylinder assembly according to claim 1 characterised in that the composition of said silicon aluminium alloy is silicon 14.5-18%; copper 2-3.5%; magnesium 1-1.5%; nickel 1.5-2.5%; manganese 0.01-3%; cobalt 0.01-3%; chromium 0.01-3%; tin 0.01-2%; titanium 0.01-0.25%; and optionally lead and molybdenum each up to 5%, the remainder being aluminium.
Claim 4
Dependent Claim
33 words
A piston and cylinder assembly according to claim 2 characterised in that said silicon aluminium alloy contains manganese in the range 0.01-1.5%; cobalt in the range 0.01-1.5%; and chromium in the range 0.01-1%.
Claim 5
Dependent Claim
52 words
A piston and cylinder assembly according to claim 1 characterised in that said silicon aluminium alloy consists essentially of silicon 14.5-18%; copper 2-3.5%; iron 2-4%; magnesium 1-1.5%; nickel 1.5-2.5%; manganese 0.4-2%; cobalt 0.4-1.5%; chromium 0.01-1%; tin 1.5-3%; titanium 0.01-0.25%; and optionally lead and molybdenum each up to 5%, the remainder being aluminium.
Claim 6
Dependent Claim
36 words
A piston and cylinder assembly according to claim 1 characterised in that said silicon aluminium alloy consists essentially of silicon 16%; copper 3%; iron 3%; magnesium 1.3%; nickel 2%; and tin 2%, the remainder being aluminium.
Claim 7
Dependent Claim
41 words
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.
Claim 8
Dependent Claim
45 words
A piston and cylinder assembly according to any one of claims 1 or 2 to 5 characterised in that the composition of the alloy of the piston comprises 12.6% silicon; 2.1% nickel; 1% copper; 1.2% magnesium; 0.15% titanium and 0.4% iron, the remainder being aluminium.
Claim 9
Dependent Claim
47 words
A piston and cylinder assembly according to any one of claims 1 or 2 to 5 characterised in that the composition of the alloy of the piston comprises 21% silicon, 1.4% copper; 1.5% nickel; 1.2% cobalt; 0.9% magnesium; 0.6% manganese and 0.5% iron, the remainder being aluminium.
Claim 10
Dependent Claim
45 words
A piston and cylinder assembly according to claim 1 characterised in that the said silicon aluminium alloy consists essentially of silicon 16%; copper 3%; iron 3%; magnesium 1.3%; nickel 2%; manganese 0.8%; cobalt 0.4%: chromium 0.4%; tin 2%; and titanium 0.2%, the remainder being aluminium.
Claim 11
Dependent Claim
44 words
A piston and cylinder assembly according to claim 1 characterised in that the said silicon aluminium alloy consists essentially of silicon 17%; copper 3.5%; iron 4.0%; magnesium 1.2%; nickel 2.3%; manganese 0.05%; cobalt 0.8%; chromium 1%; tin 4%; titanium 0.3%, the remainder being aluminium.
Claim 12
Dependent Claim
47 words
A piston and cylinder assembly according to claim 1 characterised in that the said silicon aluminium alloy consists essentially of silicon 17.5%; copper 3.5%; iron 5%; magnesium 1.2%; nickel 2%; manganese 1%; cobalt 1%; chromium 0.01%; tin 0.3%; titanium 0.3%; and lead 2%, the remainder being aluminium.
References Cited (Backward Citations)
US2357450A
Cited
US2357451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |