US4522412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil ring with coil expander
Assignee: KEIKOKU PISTON RING CO Ltd
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Filing: 1984-06-11
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Granted: 1985-06-11
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Expires: 2004-06-11
Abstract
Abstract A piston ring comprising a generally I shaped oil-scraping oil ring which has upper and lower side rails and a considerably thin web connecting the side rails, and which has an outer peripheral channel for receiving scraped oil and an inner peripheral groove for receiving coil expander, and an annular coil expander which is located in the inner peripheral groove so that the coil expander bears against the upper and lower side rails substantially at two points, the coil expander being spaced from the web of the oil ring with a slight gap therebetween.
Inventors
- 👤 Yukihiko Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:08
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/203; F16J9/06; F16J9/061; F16J9/062; F16J9/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
166 words
A piston ring comprising: an oil-scraping oil ring, made of steel, having a generally I-shaped cross-section consisting of upper and lower side rails which are mass of rigidity and a thin web for connecting the upper and lower side rails, the thickness of said web being not more than 0.8 mm, said web having a large number of oil vent holes punched along a periphery thereof, said upper and lower side rails and web defining an outer peripheral channel for receiving oil scraped and an inner peripheral groove for receiving a coil expander, said side rails having inclined flat surfaces, in the cross-section, converging to a peripherally extending center line of the web, so as to define the trapezoidal inner peripheral groove, said annular coil expander located in said inner peripheral groove and bearing against the upper and lower side rails substantially at two points, in the cross-section, said coil expander being spaced from the web of the oil ring to provide a slight gap therebetween.
Claim 2
Dependent Claim
166 words
A piston ring comprising: an oil-scraping oil ring, made of steel, having a generally I-shaped cross-section consisting of upper and lower side rails which are mass of rigidity and a thin web for connecting the upper and lower side rails, the thickness of said web being not more than 0.8 mm, said web having a large number of oil vent holes punched along a periphery thereof, said upper and lower side rails and web defining an outer peripheral channel for receiving oil scraped and an inner peripheral groove for receiving a coil expander, said side rails having inclined flat surfaces, in the cross-section, converging to a peripherally extending center line of the web, so as to define the trapezoidal inner peripheral groove, said annular coil expander located in said inner peripheral groove and bearing against the upper and lower side rails substantially at two points, in the cross-section, said coil expander being spaced from the web of the oil ring to provide a slight gap therebetween.
Claim 3
Dependent Claim
18 words
A piston ring according to claim 1, wherein said web has a thickness t wherein 0.3 mm≦t≦0.8 mm.
Claim 4
Dependent Claim
45 words
A piston ring according to claim 2, wherein each of said upper and lower side rails has a peripheral outer end, in the cross-section, having a substantially trapezoidal section, having a narrow flat outer peripheral bearing surface and presenting sharp edges for effective oil scraping.
Claim 5
Dependent Claim
23 words
A piston ring according to claim 1 wherein extensions of said inclined flat surfaces intersect at an angle of at 60° to 120°.
Claim 6
Dependent Claim
20 words
A piston ring according to claim 4, wherein extensions of said inclined flat surfaces intersect at an angle of 90°.
Claim 7
Dependent Claim
20 words
A piston ring according to claim 3, wherein said peripheral outer ends of the side rails are treated for wear-resistance.
Claim 8
Dependent Claim
27 words
A piston ring according to claim 3 wherein said peripheral outer ends of the side rails are provided with grooves which are filled with a wear-resistant material.
Claim 9
Dependent Claim
37 words
A piston ring according to claim 1 wherein said inclined flat surfaces of the side rails are treated for wear-resistance at least the portion of the inclined flat surface that comes into contact with the coil expander.
Claim 10
Dependent Claim
32 words
A piston ring according to claim 1, wherein said coil expander comprises a wound coil having a flat surface which comes into contact with the inclined flat surfaces of the oil ring.
Claim 11
Dependent Claim
16 words
A piston ring according to claim 9, wherein said coil expander is treated for wear resistance.
Claim 12
Dependent Claim
33 words
A piston ring according to claim 1 wherein said web of the oil ring has a recess which provides a slight gap between the coil expander and the web of the oil ring.
Claim 13
Dependent Claim
66 words
A piston ring according to claim 3, wherein said side rails have an outer most bearing surface width b, said coil expander comprising a wound coil having a flat surface which comes into contact with the inclined flat surface of said oil ring, said side rails having a bottom length of trapezoid x and said inclined surfaces having a bottom length y, wherein 2.5≦x/b≦8.0 and 2.0≦y/t≦5.5.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |