US4643078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced lightweight alloy piston for an internal-combustion engine and associated method
Assignee: Honda Motor Co Ltd
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Filing: 1984-05-08
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Granted: 1987-02-17
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Expires: 2004-05-08
Abstract
Abstract A fiber-reinforced lighweight alloy piston for an internal-combustion engine, comprising a piston body having a compression ring groove whose bounding surface is reinforced with alumina fibers. At least those alumina fibers positioned in the region of the annular opening of the groove has a crystalline structure of θ/α-Al 2 O 3 type and a specific gravity limited to a value between 3.7 and 3.9.
Inventors
- 👤 Keisuki Ban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:15
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22; F02; F02F; F02F3/00; F02F3/0015; F02F3/003; F02F7/00; F02F7/0085; F02F7/0087; F16J1/00; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2203/00; F05C2203/06; F05C2253/00; F05C2253/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A fiber reinforced lightweight alloy piston for an internal-combustion engine comprising a piston body of lightweight alloy provided with a compression ring groove having an inner surface, and a reinforcement means at said inner surface consisting of alumina fibers having a θ/α-Al 2 O 3 crystalline structure with a specific gravity between 3.7 and 3.9, said alumina fibers further having a crystallization ratio of 92-97% and and an α-Al 2 O 3 content of 20-30 weight %.
Claim 2
Dependent Claim
77 words
A fiber reinforced lightweight alloy piston for an internal-combustion engine comprising a piston body of lightweight alloy provided with a compression ring groove having an inner surface, and a reinforcement means at said inner surface consisting of alumina fibers having a θ/α-Al 2 O 3 crystalline structure with a specific gravity between 3.7 and 3.9, said alumina fibers further having a crystallization ratio of 92-97% and and an α-Al 2 O 3 content of 20-30 weight %.
Claim 3
Dependent Claim
33 words
A piston as claimed in claim 1 wherein said groove is annular and has an annular opening, said alumina fibers being disposed at least in the region of said opening of said groove.
Claim 4
Dependent Claim
38 words
A piston as claimed in claim 2 wherein said piston body includes a land bounding said groove, said land including an outer peripheral region, said alumina fibers being disposed in said land in said outer peripheral region thereof.
Claim 5
Dependent Claim
20 words
A piston as claimed in claim 3 wherein said alumina fibers are arranged in said land as an annular body.
Claim 6
Dependent Claim
84 words
In a fiber reinforced lightweight alloy piston for an internal-combustion engine comprising a piston body of lightweight alloy provided with a compression ring groove having an inner surface, and a reinforcement means at said inner surface constituted by alumina fibers, the improvement wherein said alumina fibers have a θ/α-Al 2 O 3 crystalline structure and a specific gravity limited to 3.7 to 3.9, said alumina fibers further having a crystallization ratio of 92-97% and an α-Al 2 O 3 content of 20-30 weight %.
Claim 7
Dependent Claim
84 words
In a fiber reinforced lightweight alloy piston for an internal-combustion engine comprising a piston body of lightweight alloy provided with a compression ring groove having an inner surface, and a reinforcement means at said inner surface constituted by alumina fibers, the improvement wherein said alumina fibers have a θ/α-Al 2 O 3 crystalline structure and a specific gravity limited to 3.7 to 3.9, said alumina fibers further having a crystallization ratio of 92-97% and an α-Al 2 O 3 content of 20-30 weight %.
Claim 8
Dependent Claim
38 words
The improvement as claimed in claim 5 wherein said piston body includes a land bounding said groove, said land including an outer peripheral region, said alumina fibers being disposed in said land in said outer peripheral region thereof.
Claim 9
Dependent Claim
20 words
The improvement as claimed in claim 5 wherein said alumina fibers are arranged in said land as an annular body.
Claim 10
Dependent Claim
93 words
In a method of reinforcing a lightweight alloy piston for an internal combustion engine wherein alumina fibers are disposed in the piston at the bounding surface of an annular compression groove of the piston, the improvement comprising selecting the fibers at least in the region of the piston at the annular opening of the groove to have a θ/α-Al 2 O 3 crystalline structure with a specific gravity limited to a value between 3.7 and 3.9 and a crystallization ratio of 92-97% and an α-Al 2 O 3 content of 20-30 weight %.
Claim 11
Dependent Claim
93 words
In a method of reinforcing a lightweight alloy piston for an internal combustion engine wherein alumina fibers are disposed in the piston at the bounding surface of an annular compression groove of the piston, the improvement comprising selecting the fibers at least in the region of the piston at the annular opening of the groove to have a θ/α-Al 2 O 3 crystalline structure with a specific gravity limited to a value between 3.7 and 3.9 and a crystallization ratio of 92-97% and an α-Al 2 O 3 content of 20-30 weight %.
Claim 12
Dependent Claim
26 words
The method as claimed in claim 8 wherein the alumina fibers are formed as an annular body and integrated with the lightweight alloy of the piston.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |