US3697090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics filled piston ring
Assignee: Sealed Power Technologies LP
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Filing: 1970-06-29
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Granted: 1972-10-10
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Expires: 1990-06-29
Abstract
Abstract A compression piston ring composed of a segmented circumferentially expansible metal ring and an elastomeric plastic ring, preferably a fluorocarbon plastic ring, anchored to and supported by the metal ring and providing a peripheral sealing surface conforming with and riding on the cylinder in which the piston operates. The elastomeric plastic material is oil resistant, has a low coefficient of friction, and retains its integrity under the operating conditions existing in an internal combustion engine. The plastics material is preferably injected into the segmented metal ring to fill all voids of the metal ring, eliminating all gap leakage, and insuring low blowby, minimized air pollution, and oil oxidation.
Inventors
- 👤 Arthur M Brenneke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:12
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066; F16J9/069; F16J9/12; F16J9/20; F16J9/203; F16J9/206; F16J9/28; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
The piston ring of claim 1 wherein the elastomeric plastic is selected from the group consisting of fluorocarbon, aromatic polyimide and silicone resins retaining their integrity under conditions obtaining in an engine piston and cylinder assembly.
Claim 2
Dependent Claim
13 words
The piston ring of claim 1 wherein the elastomeric plastics material is polytetrafluoroethylene.
Claim 3
Dependent Claim
76 words
A piston ring adapted for the second ring groove of an internal combustion engine piston and cylinder assembly which comprises a one-piece, radially opening channel shaped, circumferentially expansible metal ring having circumferentially separated segments and an elastomeric plastics material ring receiving said segments in embedded relation and integrally anchored to the metal ring and providing a peripheral cylinder wall sealing surface resiliently loaded by the metal ring to conform with and ride on the cylinder wall.
Claim 4
Dependent Claim
42 words
The piston ring of claim 4 wherein the metal ring has circumferentially spaced radially extending segments connected by circumferentially spaced legs on the inner periphery of the ring and the plastics material fills all of the voids between the legs and segments.
Claim 5
Dependent Claim
95 words
An integrated metal and plastics compression ring for internal combustion engIne pistons which comprises a one-piece, radially opening channel shaped, circumferentially expansible metal ring having circumferentially separated radially extending segments, and an elastomeric plastics ring integrally anchored to said metal ring and extending between the segments to seal the gaps therebetween with the segments of the metal ring forming at least one lateral side face of the plastics ring and bridging the gap between the piston and the cylinder in an internal combustion engine piston and cylinder assembly to protect the plastic ring against deformation.
Claim 6
Dependent Claim
95 words
A second compression ring for an internal combustion engine piston which comprises a metal one-piece, radially opening channel shaped, circumferentially expansible outwardly opening channel ring composed of circumferentially separated radially extending segments having gaps therebetween providing axially spaced cylinder wall confronting peripheral edges, and an elastomeric plastics ring filling the channel of the metal ring and the gaps between the segments in firmly anchored relation to the metal ring and providing a peripheral sealing surface between the peripheral edges of the metal ring for riding on the cylinder wall of a piston and cylinder assembly.
Claim 7
Dependent Claim
19 words
The piston ring of claim 7 wherein the plastics ring extends beyond the inner periphery of the metal ring.
Claim 8
Dependent Claim
86 words
A piston ring comprising a metal circumferentially expansible ring component and an elastomeric plastics ring component anchored to the metal component and providing a peripheral surface for riding on a cylinder wall in a piston and cylinder assembly, said metal ring component being a channel ring with top and bottom rows of circumferentially spaced radial segments connected by upstanding spring legs spaced circumferentially around the inner periphery of the ring and said plastics ring component filling the channel and the gaps between the segments and legs.
Claim 9
Dependent Claim
21 words
The ring of claim 9 wherein the plastics ring component is flush with the outer surfaces of the metal ring component.
Claim 10
Dependent Claim
66 words
A piston ring comprising a metal circumferentially expansible ring component and an elastomeric plastics ring component anchored to the metal ring component and providing a peripheral sealing surface for riding on a cylinder wall in a piston and cylinder assembly, said metal ring component having circumferentially spaced radial segments underlying the plastics ring component and said segments having upstanding tabs embedded in the plastics ring component.
Claim 11
Dependent Claim
74 words
A piston ring comprising a metal ring component and an elastomeric plastics ring component anchored to the metal ring component and providing a peripheral sealing surface for riding on a cylinder wall in a piston and cylinder assembly, said metal ring component being comprised of two axially spaced one-piece circumferentially expansible rings forming the top and bottom of the piston ring and tabs on each axially spaced ring embedded in the plastics ring component.
References Cited (Backward Citations)
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US2296334A
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US2807511A
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |