Patent US3750403A successfully refreshed from Google Patents.
US3750403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line and/or space for receiving or conducting hot gases
Assignee: Daimler Benz AG
•
Filing: 1970-07-29
•
Granted: 1973-08-07
•
Expires: 1990-07-29
Abstract
Abstract A structure forming lines and/or spaces that are preferably provided with a cooling water jacket and serve for the accommodation and/or conduction of hot gases, and which may be utilized as exhaust gas lines and/or combustion spaces of internal combustion engines, particularly of Diesel engines with exhaust gas turbochargers; the lines and/or the spaces are provided with a heat insulation on the side of their wall in contact with the gas; the heat insulation is formed by a sheet metal liner and/or a ceramic layer.
Inventors
- 👤 H Deutschmann
- 👤 W Kruczek
- 👤 Lazzer K De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:46
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N13/10; F01N13/102; F01N3/00; F01N3/02; F01N3/04; F01N3/043; F01N3/046; F16; F16L; F16L59/00; F16L59/14; F16L59/147; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
260 words
An exhaust gas manifold construction for an internal combustion engine comprising: at least one exhaust duct, an external casing surrounding said duct, said external casing and said duct including portions forming a cooling water jacket therebetween, and a heat resistant sheet metal liner arranged inside of said exhaust duct for preventing hot exhaust gases passing through said duct from directly engaging the inner walls of said duct, wherein said duct and at least part of said external casing are formed as a one-piece cast article, wherein said cooling water jacket is configured for maintaining the temperature of the casting forming the duct lower than the temperature of the liner during engine operation, wherein at least parts of both the inner walls of said duct and the outer surfaces of said liner are constructed tubularly shaped with the inner walls of said duct facing generally inwardly toward the center of the duct and the outer surfaces of the liner generally facing said inner walls, wherein said liner is provided with predetermined folds and is positioned in said duct prior to casting of said duct, the outer surfaces of said liner and said folds being so arranged with respect to the inner walls of said duct that portions of the liner outer surfaces are lifted off from the inner walls of the duct by shrinkage of the duct causing bending of said liner along said folds during coolIng of the casting, insulating air spaces being formed between those portions of the liner lifted off from the inner walls and said inner walls.
Claim 2
Dependent Claim
260 words
An exhaust gas manifold construction for an internal combustion engine comprising: at least one exhaust duct, an external casing surrounding said duct, said external casing and said duct including portions forming a cooling water jacket therebetween, and a heat resistant sheet metal liner arranged inside of said exhaust duct for preventing hot exhaust gases passing through said duct from directly engaging the inner walls of said duct, wherein said duct and at least part of said external casing are formed as a one-piece cast article, wherein said cooling water jacket is configured for maintaining the temperature of the casting forming the duct lower than the temperature of the liner during engine operation, wherein at least parts of both the inner walls of said duct and the outer surfaces of said liner are constructed tubularly shaped with the inner walls of said duct facing generally inwardly toward the center of the duct and the outer surfaces of the liner generally facing said inner walls, wherein said liner is provided with predetermined folds and is positioned in said duct prior to casting of said duct, the outer surfaces of said liner and said folds being so arranged with respect to the inner walls of said duct that portions of the liner outer surfaces are lifted off from the inner walls of the duct by shrinkage of the duct causing bending of said liner along said folds during coolIng of the casting, insulating air spaces being formed between those portions of the liner lifted off from the inner walls and said inner walls.
Claim 3
Dependent Claim
38 words
A construction according to claim 1, wherein the folds extend in the longitudinal direction of the duct, and wherein the folds are uniformly distributed around at least a part of the circumference of the inside of the duct.
Claim 4
Dependent Claim
32 words
A construction according to claim 1, wherein the inside walls of said duct includes raised portions for pressing the sheet metal lining inwardly to aid in the fold and air space formation.
Claim 5
Dependent Claim
25 words
A construction according to claim 1, wherein said duct and external casing are constructed of aluminum and wherein said liner is constructed of heat-resistant steel.
Claim 6
Dependent Claim
249 words
An exhaust gas manifold construction for an internal combustion engine comprising: at least one exhaust duct, an external casing surrounding said duct, said external casing and said duct including portions forming a cooling water jacket therebetween, and a heat resistant sheet metal liner arranged inside of said exhaust duct for preventing hot exhaust gases passing through said duct from directly engaging the inner walls of said duct, wherein said duct and at least part of said external casing are formed as a one-piece cast article, wherein said cooling water jacket is configured for maintaining the temperature of the casting forming the duct lower than the temperature of the liner during engine operation, wherein at least parts of both the inner walls of said duct and the outer surfaces of said liner are constructed tubularly shaped with the inner walls of said duct facing generally inwardly toward the center of the duct and the outer surfaces of the liner generally facing said inner walls, and wherein said liner is provided with predetermined folds, the outer surfaces of said liner and said folds being so arranged with respect to the inner walls of said duct that portions of the liner outer surfaces are lifted off from the inner walls of the duct by shrinkage of the duct causing bending of said liner along said folds during cooling of the casting, insulating air spaces being formed between those portions of the liner lifted off from the inner walls and said inner walls.
Claim 7
Dependent Claim
249 words
An exhaust gas manifold construction for an internal combustion engine comprising: at least one exhaust duct, an external casing surrounding said duct, said external casing and said duct including portions forming a cooling water jacket therebetween, and a heat resistant sheet metal liner arranged inside of said exhaust duct for preventing hot exhaust gases passing through said duct from directly engaging the inner walls of said duct, wherein said duct and at least part of said external casing are formed as a one-piece cast article, wherein said cooling water jacket is configured for maintaining the temperature of the casting forming the duct lower than the temperature of the liner during engine operation, wherein at least parts of both the inner walls of said duct and the outer surfaces of said liner are constructed tubularly shaped with the inner walls of said duct facing generally inwardly toward the center of the duct and the outer surfaces of the liner generally facing said inner walls, and wherein said liner is provided with predetermined folds, the outer surfaces of said liner and said folds being so arranged with respect to the inner walls of said duct that portions of the liner outer surfaces are lifted off from the inner walls of the duct by shrinkage of the duct causing bending of said liner along said folds during cooling of the casting, insulating air spaces being formed between those portions of the liner lifted off from the inner walls and said inner walls.
Claim 8
Dependent Claim
38 words
A construction according to claim 5, wherein the folds extend in the longitudinal direction of the duct, and wherein the folds are uniformly distributed around at least a part of the circumference of the inside of the duct.
Claim 9
Dependent Claim
32 words
A construction according to claim 5, wherein the inside walls of said duct includes raised portions for pressing the sheet metal lining inwardly to aid in the fold and air space formation.
Claim 10
Dependent Claim
25 words
A construction according to claim 5, wherein said duct and external casing are constructed of aluminum and wherein said liner is constructed of heat-resistant steel.
Claim 11
Dependent Claim
87 words
A construction according to claim 5, wherein said folds are formed by planar sections of said liner angled with respect to one another, each planar section having a straight edge portion spaced maximally from said inside surface and another opposite straight edge portion in contact with said inside surface, each of the air spaces being bounded by two adjacent planar sections and the inside surface of the duct with the midpoint of the air space being disposed adjacent the maximally spaced edge portions of the planar sections.
Claim 12
Dependent Claim
34 words
A construction according to claim 9, wherein any contact between said liner and said duct is exclusively along lines forming the edges of adjacent air spaces and at circumferential connecting places on the liner.
References Cited (Backward Citations)
US1926499A
Cited
US2075388A
Cited
US2204294A
Cited
US2600529A
Cited
US2858667A
Cited
US2886945A
Cited
US3043094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |