US3677558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil stripping piston ring
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1971-02-11
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Granted: 1972-07-18
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Expires: 1991-02-11
Abstract
Abstract An oil stripping piston employed on an internal combustion engine, especially aimed at elevated contact pressure and drastic reduction of lubrication oil consumption, on which a hardened surface is provided either on the top or bottom rubbing surface of the oil stripping piston ring and on the back of said oil stripping piston ring. An expander is mounted in the position selected for even distribution of rubbing wear of the hardened surface and the base material of the piston ring for maintaining a constant wear step between the said two rubbing surfaces.
Inventors
- 👤 Eisuke Sugahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:20
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/203; F16J9/06; F16J9/061; F16J9/062
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
An oil stripping piston ring member for a piston member wherein the inner front end surface of said ring member contacts said piston member in which a hardened surface is provided at least at one of the top or bottom rubbing surfaces of one of said members, and, on the outer back surface of said oil stripping piston ring an expander is mounted in a position selected fro even distribution of rubbing wear of both the hardened surface and the basic material of the piston ring so as to maintain a constant wear step between said two rubbing surfaces.
Claim 2
Dependent Claim
99 words
An oil stripping piston ring member for a piston member wherein the inner front end surface of said ring member contacts said piston member in which a hardened surface is provided at least at one of the top or bottom rubbing surfaces of one of said members, and, on the outer back surface of said oil stripping piston ring an expander is mounted in a position selected fro even distribution of rubbing wear of both the hardened surface and the basic material of the piston ring so as to maintain a constant wear step between said two rubbing surfaces.
Claim 3
Dependent Claim
15 words
A piston ring as claimed in claim 1, wherein said expander is a coil expander.
Claim 4
Dependent Claim
30 words
A piston ring as claimed in claim 1, wherein said hardened surface is selected from the group consisting of chromium plating, a molybdenum film layer or a nitrided hardened surface.
Claim 5
Dependent Claim
87 words
In combination, a piston member with a piston cylinder (7), an oil stripping ring with an inner window (6) for oil passage, and to (1) and bottom (2) rubbing surfaces above and below said window, an outer semi-circular groove (5) on the outer side of said ring, a hard component (3) at one of said top or bottom rubbing surfaces, and, an expander (4) in said groove biased to urge said rubbing surfaces in constant contact with said piston cylinder (7) compensating for wear and tear thereon.
Claim 6
Dependent Claim
87 words
In combination, a piston member with a piston cylinder (7), an oil stripping ring with an inner window (6) for oil passage, and to (1) and bottom (2) rubbing surfaces above and below said window, an outer semi-circular groove (5) on the outer side of said ring, a hard component (3) at one of said top or bottom rubbing surfaces, and, an expander (4) in said groove biased to urge said rubbing surfaces in constant contact with said piston cylinder (7) compensating for wear and tear thereon.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |