US3890950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston lubricating
Assignee: Megatech Corp USA
•
Filing: 1973-10-02
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Granted: 1975-06-24
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Expires: 1993-10-02
Abstract
Abstract A self-lubricating piston for an internal combustion engine comprises a composite coating adhered to a grooved piston surface and containing therein a first reinforcing phase of high tensile strength, high modulus of elasticity, reinforcing fibers of graphitic structure and a second reinforcing phase of powdered solid lubricant. The fibers are spooled around the piston and continuous for at least two turns. The fibers are preferably contacted along their lengths with longitudinally discontinuous bands of high thermal conductivity soft material forming multiple radial heat transfer paths throughout the composite layer.
Inventors
- 👤 Charles W Haldeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:18
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/08; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0882
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
Self-lubricating piston apparatus for a combustion engine comprising, means defining a base piston structure having an external wall, means defining a bearing surface layer for said structure bonded to said external wall and comprising a plastic matrix extending longitudinally along and over the full lateral extent of said base surface, means defining a first strengthening reinforcement and lubricating phase distributed in said matrix comprising a plurality of elongated plastic impregnated yarn of ceramic fibers of lamellar crystal structure at an external surface of said layer running the full lateral extent of said bearing surface layer and parallel to each other, means defining a second strengthening reinforcement and lubricating phase distributed throughout the longitudinal and lateral extent of said bearing surface layer comprising a dispersed particulated solid lubricant, and means defining heat transfer paths regularly distributed through said bearing surface layer for conducting heat from said external surface and said fibers through at least a portion of the thickness dimension of said bearing surface layer.
Claim 2
Dependent Claim
164 words
Self-lubricating piston apparatus for a combustion engine comprising, means defining a base piston structure having an external wall, means defining a bearing surface layer for said structure bonded to said external wall and comprising a plastic matrix extending longitudinally along and over the full lateral extent of said base surface, means defining a first strengthening reinforcement and lubricating phase distributed in said matrix comprising a plurality of elongated plastic impregnated yarn of ceramic fibers of lamellar crystal structure at an external surface of said layer running the full lateral extent of said bearing surface layer and parallel to each other, means defining a second strengthening reinforcement and lubricating phase distributed throughout the longitudinal and lateral extent of said bearing surface layer comprising a dispersed particulated solid lubricant, and means defining heat transfer paths regularly distributed through said bearing surface layer for conducting heat from said external surface and said fibers through at least a portion of the thickness dimension of said bearing surface layer.
Claim 3
Dependent Claim
22 words
Piston apparatus in accordance with claim 1 wherein, said piston external wall is cylindrical and said reinforcing fibers are spirally wound thereon.
Claim 4
Dependent Claim
26 words
Piston apparatus in accordance with claim 1 wherein the base pisTon structure comprises a longitudinally elongated recess of its external wall underlaying the bearing surface layer.
Claim 5
Dependent Claim
20 words
Piston apparatus in accordance with claim 1 wherein said external wall has a surface enhancement ratio of at least 2.0.
Claim 6
Dependent Claim
13 words
Piston apparatus in accordance with claim 4 wherein said external wall is grooved.
Claim 7
Dependent Claim
42 words
Piston apparatus in accordance with claim 1 wherein said yarn comprises a metallic coating thereon which is discontinuous along the length of fiber reinforcement but provides multiple parallel heat transfer paths through the matrix from its outer surface to said external wall.
Claim 8
Dependent Claim
93 words
Piston apparatus in accordance with claim 1 wherein said piston external wall is cylindrical and said reinforcing fibers are spirally wound thereon, the base piston structure comprises a longitudinally elongated recess of its external wall underlaying the bearing surface layer, said external wall has a surface enhancement ratio of at least 2.0, said yarn comprises a metallic coating thereon which provides multiple parallel heat transfer paths through the matrix from its outer surface to said external wall, and further comprising means defining an annular gas shield at an axial end of said matrix.
Claim 9
Dependent Claim
39 words
Piston apparatus in accordance with claim 7 and further comprising, means defining an engine cylinder closely surrounding the external wall of said piston and comprising means for expanding a combustion gas mixture to drive the piston within said cylinder.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |