US4369980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire ring for cylinder head gasket
Assignee: Deutz Allis Corp
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Filing: 1981-10-07
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Granted: 1983-01-25
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Expires: 2001-10-07
Abstract
Abstract A cylinder head gasket for an internal combustion engine having double metal wrapped hoops providing a reinforced fire ring around the combustion chamber. The inner hoop is the larger hoop to carry the clamping load and form a positive seal while the outer hoop reinforces the inner hoop.
Inventors
- 👤 Robert R. Backlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:22
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/12; F16J15/121; F16J15/122; F16J15/123; F02; F02F; F02F7/00; F02F7/006; F02F2007/0063
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
An internal combustion engine having a cylinder head gasket comprising, a cylinder block defining at least one bore, a cylinder sleeve received in said bore, a cylinder head, a cylinder head gasket compressively positioned between said cylinder head and said block and sleeve to form a seal, said gasket including a body defining a cylinder opening, a fire ring received in said opening including a radially inner sealing hoop compressively deformed to form a seal between said cylinder head and said cylinder sleeve, a radially outer and reinforcing hoop disposed between said sealing hoop and the body of said gasket pressing radially inward against said inner sealing hoop, a metal wrap enclosing said hoops and fastened to the body of said gasket and compressively sealed with said cylinder head and cylinder block to thereby provide a sealing gasket assembly.
Claim 2
Dependent Claim
139 words
An internal combustion engine having a cylinder head gasket comprising, a cylinder block defining at least one bore, a cylinder sleeve received in said bore, a cylinder head, a cylinder head gasket compressively positioned between said cylinder head and said block and sleeve to form a seal, said gasket including a body defining a cylinder opening, a fire ring received in said opening including a radially inner sealing hoop compressively deformed to form a seal between said cylinder head and said cylinder sleeve, a radially outer and reinforcing hoop disposed between said sealing hoop and the body of said gasket pressing radially inward against said inner sealing hoop, a metal wrap enclosing said hoops and fastened to the body of said gasket and compressively sealed with said cylinder head and cylinder block to thereby provide a sealing gasket assembly.
Claim 3
Dependent Claim
28 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein the sealing hoop defines a slightly greater thickness than the reinforcing hoop.
Claim 4
Dependent Claim
36 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein said block defines the bore and a counterbore, said sleeve defines a flange received in the counterbore of said block.
Claim 5
Dependent Claim
35 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein said sealing hoop compressively seals between said block and said sleeve to form a fluid-tight seal in said engine.
Claim 6
Dependent Claim
40 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein said reinforcing hoop defines a lesser thickness than said sealing hoop to reinforce said sealing hoop and provide structural integrity of the fire ring.
Claim 7
Dependent Claim
21 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein said hoops define steel hoops.
Claim 8
Dependent Claim
28 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein said sleeve defines a fire shield extending radially inward of said gasket.
Claim 9
Dependent Claim
27 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein at least one of said hoops defines a round cross-sectional configuration.
Claim 10
Dependent Claim
27 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein at least one of said hoops defines a rectangular cross-sectional configuration.
Claim 11
Dependent Claim
42 words
An internal combustion engine having a cylinder head gasket as set forth in claim 1 wherein said metal wrap encloses said hoops and overlays a portion of the body of said gasket and engages the upper and lower surfaces of said gasket.
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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |