US4214762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolled metal piston ring
Assignee: Sanford Acquisition Co
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Filing: 1978-08-03
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Granted: 1980-07-29
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Expires: 1998-08-03
Abstract
Abstract A rolled steel oil control piston ring for internal combustion engines is of generally U-shaped cross section with a pair of opposed rigid sidewalls projecting inwardly of the ring from a central peripheral wall thereof. A pair of flat-faced solid scraper rims formed by closed pleats rolled from the peripheral wall extend outwardly of the ring. The ring is made by rolling flat strip steel stock through a series of profiled rollers. Pleats are formed in the central portion by the profiled rollers and the pleats are closed on themselves to provide the solid scraper rims. The finished strip is then punched to provide the vent openings in the peripheral wall, and coiled and cut to form individual piston rings.
Inventors
- 👤 Harold E. McCormick
- 👤 Herbert F. Prasse
- 👤 William F. Ott
- 👤 Donald J. Mayhew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:49
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/08; F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/063; F16J9/12; F16J9/20; F16J9/203; Y; Y10; Y10S; Y10S277/00; Y10S277/924
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
223 words
An oil control piston ring for location in a groove of a piston which moves in a bore in a cylinder of an internal combustion engine, said oil control ring comprising a steel strip having a split annular shape, said strip including a pair of sidewall portions and an intermediate wall portion defining a radially inwardly opening channel, said ring having at its outer periphery a pair of axially spaced cylindrical surfaces for oil scraping engagement with said cylinder bore, said cylindrical surfaces each being located at the juncture of respective radially outwardly extending portions of said strip, said respective radially outwardly extending portions extending radially outwardly with respect to said intermediate wall portion and forming a pair of axially spaced oil scraping rims, said portions having an inner apex and having confronting inner surfaces which abut, said confronting inner surfaces being in abutting relation at the inner apex and abutting continuously as they extend from said inner apex toward said intermediate wall, said abutting relation existing for at least part of the distance between said inner apex and the intermediate wall, said sidewall portions extending radially inwardly relative to said intermediate wall in a direction opposite from that of said radially outwardly extending portions, and said intermediate wall, said oil scraping rims, and said sidewalls being formed from a single steel strip.
Claim 2
Dependent Claim
223 words
An oil control piston ring for location in a groove of a piston which moves in a bore in a cylinder of an internal combustion engine, said oil control ring comprising a steel strip having a split annular shape, said strip including a pair of sidewall portions and an intermediate wall portion defining a radially inwardly opening channel, said ring having at its outer periphery a pair of axially spaced cylindrical surfaces for oil scraping engagement with said cylinder bore, said cylindrical surfaces each being located at the juncture of respective radially outwardly extending portions of said strip, said respective radially outwardly extending portions extending radially outwardly with respect to said intermediate wall portion and forming a pair of axially spaced oil scraping rims, said portions having an inner apex and having confronting inner surfaces which abut, said confronting inner surfaces being in abutting relation at the inner apex and abutting continuously as they extend from said inner apex toward said intermediate wall, said abutting relation existing for at least part of the distance between said inner apex and the intermediate wall, said sidewall portions extending radially inwardly relative to said intermediate wall in a direction opposite from that of said radially outwardly extending portions, and said intermediate wall, said oil scraping rims, and said sidewalls being formed from a single steel strip.
Claim 3
Dependent Claim
45 words
The piston ring of claim 1 wherein said radially outwardly extending portions have outer surfaces which converge as they extend radially outwardly from said intermediate wall and said cylindrical surfaces comprise a wear resistant material coated on said juncture of said radially outwardly extending portions.
Claim 4
Dependent Claim
13 words
The piston ring of claim 2 wherein said wear resistant material is chromium.
Claim 5
Dependent Claim
15 words
The piston ring of claim 1 wherein said steel is a carbon-containing chromium alloy steel.
Claim 6
Dependent Claim
55 words
An oil control piston ring in accordance with claim 1 in which the inner surface of the sidewalls intersect the intermediate wall at substantially a right angle with an inward or outward flare not exceeding 0.00015" measured over 0.050" of the sidewalls from a point 0.020" from the radially innermost extent of said sidewall portions.
Claim 7
Dependent Claim
121 words
The oil control ring of claim 1 in combination with an expander ring having leg portions and a base portion forming an outwardly opening channel and dimensioned to fit with said inwardly opening channel of said oil control piston ring with the leg portions extending radially outwardly and the base portion forming the innermost portion of the expander ring, the outer extremities of the leg portions being positioned to engage the inner surface of the intermediate wall of said oil control piston ring next to the intersection of the sidewall portions with said intermediate wall to exert a radially outwardly directed expanding force on said oil control ring and maintain said cylindrical surfaces in oil scraping relation with said cylindrical bore.
Claim 8
Dependent Claim
36 words
The oil control piston ring of claim 1 wherein said confronting inner surfaces of said portions forming said oil scraping rims extend radially from said channel and abut for substantially all of the radial extent thereof.
Claim 9
Dependent Claim
23 words
An oil control piston ring in accordance with claim 1, 2 or 3 wherein each of said cylindrical surfaces has the same diameter.
Claim 10
Dependent Claim
29 words
An oil control piston ring in accordance with claim 1 further including circumferentially spaced vent openings in the intermediate wall, said openings being disposed between said oil scraping rims.
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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) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |