Patent US6221029B1 successfully refreshed from Google Patents.
US3814447A
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US
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Sealing element for use in internal combustion engines
Assignee: Sealed Power Technologies LP
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Filing: 1972-11-02
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Granted: 1974-06-04
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Expires: 1992-11-02
Abstract
Abstract Sealing elements for use in internal combustion engines, such as piston rings for reciprocating pistons, seals for rotary pistons in engines of the type generally referred to as the Wankel engine, and similar structures in which a sealing element having a hard, wear-resistant bearing surface provides a seal between relatively movable slidable surfaces to prevent or substantially reduce flow therebetween of fluids such as combustion gases, oil films and the like. Such hard, wear and scuff-resistant facings, coatings and the like are preferably provided by the plasma jet application to the peripheral bearing surfaces of the sealing elements of alloy-forming compositions comprising effective proportions of a tungsten carbide-cobalt aggregate; molybdenum; and a nickel-chrome-boron-silicon alloy. For best results the plasma-applied final coating is substantially free from such detrimental components as nickel in its free state and aluminum oxide. If the nickel is present only in a combined form, as it is in nicrome (a nickel-chrome alloy containing about 60% Ni), the nickel has no detrimental effect.
Inventors
- 👤 H Prasse
- 👤 Cormick H Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:12
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; C; C22; C22C; C22C27/00; C22C27/04; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/067; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; F16J9/12; F16J9/20; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/937; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12861; Y10T428/12951
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
32 words
A sealing element as defined by claim 1 wherein said molybdenum phase is substantially 100 percent molybdenum and constitutes about 42 percent by volume of said alloy coating by electron probe analysis.
Claim 2
Dependent Claim
27 words
A sealing element as defined by claim 1 wherein said nickel-chromium alloy phase constitutes about 45 percent by volume of said alloy coating by electron probe analysis.
Claim 3
Dependent Claim
25 words
A sealing element as defined by claim 1 wherein said tungsten-cobalt phase by spectrophotometric analysis constitutes about 26 percent by weight of said alloy coating.
Claim 4
Dependent Claim
25 words
A sealing element as defined by claim 1 wherein said molybdenum phase by spectrophotometric analysis constitutes about 45 percent by weight of said alloy coating.
Claim 5
Dependent Claim
23 words
A sealing element as defined by claim 1 wherein said nickel-chromium alloy phase constitutes about 29 percent by weight of said alloy coating.
Claim 6
Dependent Claim
89 words
A sealing element as defined by claim 1 wherein said tungsten-cobalt phase constitutes by electron probe analysis about 13 percent by volume and by spectrophotometric analysis about 26 percent by weight of said alloy coating; said molybdenum phase constitutes by electron probe analysis about 42 percent by volume and by spectrophotometric analysis about 45 percent by weight of said alloy coating; and said nickel-chromium alloy phase constitutes by electron probe analysis about 45 percent by volume and by spectrophotometric analysis about 29 percent by weight of said alloy coating.
Claim 7
Dependent Claim
86 words
A sealing element having a relatively rigid ferrous substrate and an alloy coating forming a bearing facing bonded thereto, said alloy coating having the following phases constituting the respective approximate volume and weight percentages as shown: Alloy Coating Volume % Weight % (Phases) (electron probe (spectraphotometric analysis) analysis) W, Co 13.3 26 Mo 42.1 45 Ni-Cr 44.6 29 said alloy coating having the following approximate percentages by weight of individual elements: Mo-45% W-18% Ni-15% Co-8% Cr-4% Fe-4.5% Si-3% Al-1% B-NoT determined but calculated by difference 2%
Claim 8
Dependent Claim
112 words
A sealing element for use in restricting the flow of fluids between superfically contacting relatively sliding surfaces, said sealing element having a relatively rigid body and a coating on a bearing face of said body for bearing contact with one of said surfaces to effect a seal between said surfaces, said sealing element coating being that resulting from an oxidizing plasma flame applied powder mixture of starting ingredients consisting essentially of: from about 38 percent to about 42 percent by weight of a tungsten carbide-cobalt aggregate, from about 30 percent to about 40 percent by weight of molybdenum and from about 18 to about 32 percent by weight of a nickel-chromium-boron-silicon alloy.
Claim 9
Dependent Claim
48 words
A sealing element as defined in claim 9 in which the tungsten carbide-cobalt aggregate has the following analysis expressed in percentages by weight: tungsten 79.5 to 83.5% cobalt 11 to 13% carbon 5.15 to 9.5% iron 1.5% maximum and the balance by difference being non-essential components including impurities.
Claim 10
Dependent Claim
60 words
A sealing element as defined by claim 9 in which the nickel-chromium-boron-silicon alloy has the following analysis expressed in percentages by weight: nickel 60 to 75% chromium 13 to 20% silicon 3 to 5% boron 2.75 to 4.7% iron 3 to 5% carbon 0.6 to 1.3% cobalt 0.1 % maximum and the balance by difference being non-essential components including impurities.
Claim 11
Dependent Claim
22 words
A sealing element as defined by claim 10 wherein said nickel-chromium-boron-silicon alloy is within the weight percentage ranges defined by claim 11.
Claim 12
Dependent Claim
95 words
A sealing element as defined by claim 9 wherein the elements of said powder mixture are present within the following range percentages by weight: tungsten from about 30 to about 35% cobalt from about 4 to about 6% carbon from about 1.9 to about 4% molybdenum from about 30 to about 40% nickel from about 10 to about 24%chromium from about 2.3 to about 6.4%silicon from about 0.5 to about 1.6% boron from about 0.4 to about 1.5% iron from about 0.5 to about 0.6% and the balance by difference being non-essential ingredients including impurities.
Claim 13
Dependent Claim
28 words
A sealing element as defined by claim 9 wherein said sealing element is a piston ring and said bearing face coating is a hard wear-resistant and scuff-resistant coating.
Claim 14
Dependent Claim
31 words
A sealing element as defined by claim 9 wherein said sealing element is a rotary combustion engine piston seal and said bearing face coating is a hard wear-resistant and scuff-resistant coating.
Claim 15
Dependent Claim
48 words
A sealing element having a relatively rigid body and an alloy coating formed in situ thereon composed of a tungsten-cobalt phase, a molybdenum phase and a nickel-chromium-boron-silicon alloy phase, said tungsten-cobalt phase being substantially free from carbon and constituting about 13 percent of said alloy coating by volume.
Claim 16
Dependent Claim
22 words
A sealing element as defined by claim 16 in which the starting ingredients are substantially the same as specified in claim 9.
Claim 17
Dependent Claim
28 words
A sealing element as defined by claim 6 wherein said molybdenum phase is substantially 100 percent molybdenum and constitutes about 42 percent by volume of said alloy coating.
Claim 18
Dependent Claim
21 words
A sealing element as defined by claim 18 wherein the starting ingredients are substantially the same as specified in claim 9.
Claim 19
Dependent Claim
23 words
A sealing element as defined by claim 16 wherein said nickel-chromium-boron-silicon alloy phase constitutes about 45 percent by volume of said alloy coating.
Claim 20
Dependent Claim
25 words
A sealiNg element as defined by claim 16 wherein said tungsten-cobalt phase by microprobe analysis constitutes about 26 percent by weight of said alloy coating.
Claim 21
Dependent Claim
25 words
A sealing element as defined by claim 16 wherein said molybdenum phase by microprobe analysis constitutes about 45 percent by weight of said alloy coating.
Claim 22
Dependent Claim
26 words
A sealing element as defined by claim 16 wherein said nickel-chromium-boron-silicon alloy phase by microprobe analysis constitutes about 29 percent by weight of said alloy coating.
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |