US3690686A
Expired / Lapsed
US
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Piston with seal having high strength molybdenum alloy facing
Assignee: Sealed Power Technologies LP
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Filing: 1969-08-11
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Granted: 1972-09-12
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Expires: 1989-08-11
Abstract
Abstract Piston rings, including compression and oil control rings, for internal combustion engine pistons, having a bearing face of an alloy formed in situ on the ring from a plasma jet stream. The alloy is a high strength molybdenum alloy composed of molybdenum and a metal such as nickel, chromium, boron, and silicon. The coating has exceptionally high bond strength and possesses a higher tensile strength than present in heretofore used piston ring facings comprising molybdenum as the facing material. The piston rings are particularly useful in operation of heavy duty engines.
Inventors
- 👤 Herbert F Prasse
- 👤 Harold E Mccormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:09
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12479; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A piston ring having a bearing face coated with a plasma jet applied high strength alloy having the following percentages by weight: 65-90 percent by weight of molybdenum 6.5-25 percent by weight of nickel 1.3-7 percent by weight of chromium 0.3-1.7 percent by weight of silicon 0.2-1.7 percent by weight of boron 0.3-1.7 percent by weight of iron 0.1-0.4 percent by weight of cobalt Balance - carbon and manganese.
Claim 2
Dependent Claim
90 words
A piston ring having a bearing face of a high strength molybdenum alloy, said alloy having a tensile strength of at least 10,000 psi and a bond strength (in shear) of at least 10, 000 psi wherein said alloy is formed in situ on said bearing face and wherein the ingredients forming said alloy consist essentially of the following in the specified percentages by weight: 65 - 90 percent molybdenum 7 - 25 percent nickel 1 - 6 percent chromium 0.3 - 1.5 percent boron 0.2 - 1.5 percent silicon.
Claim 3
Dependent Claim
58 words
The piston ring of claim 3, wherein the molybdenum is present in the amount of 75 percent, the nickel is present in the amount of 17.5 percent, the chromium is present in the amount of 4.12 percent, the boron is present in the amount of 0.95 percent, and the silicon is present in the amount of 1.00 percent.
Claim 4
Dependent Claim
34 words
The piston ring of claim 3, wherein said bearing face has a porosity of less than about 15 percent but a sufficient porosity to carry a lubricant in the surface for good scuff resistance.
Claim 5
Dependent Claim
101 words
In combination with an internal combustion engine piston, a piston seal having a ferrous metal body and a high strength molybdenum alloy bonded thereto and providing the sealing face for the body, said alloy having a tensile strength of at least 10,000 psi and bond strength (in shear) of at least 10,000 psi, said alloy being formed in situ on said sealing face from ingredients consisting essentially of the following in the specified percentages by weight: 65 - 90 percent molybdenum 7 - 25 percent nickel 1 - 6 percent chromium 0.3 - 1.5 percent boron 0.2 - 1.5 percent silicon.
Claim 6
Dependent Claim
79 words
A piston ring having a bearing face of a high strength molybdenum alloy wherein said alloy is formed in situ on said bearing face and wherein the ingredients forming said alloy consist of the following in the specified percentages by weight: 65 - 90 percent molybdenum 7 - 25 percent nickel 1 - 6 percent chromium 0.3 - 1.5 percent boron 0.2 - 1.5 percent silicon any balance being from the group consisting of iron, cobalt, carbon and manganese.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |