US4676207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary combustion chamber
Assignee: Niterra Co Ltd
•
Filing: 1985-04-05
•
Granted: 1987-06-30
•
Expires: 2005-04-05
Abstract
Abstract An auxiliary combustion chamber for an internal combustion engine having a semi-spherical insulating ceramic liner and a heat resistant ceramic nozzle portion. The chamber has an outer metal member that is cast around the ceramic liner to impart significant compressive stress thereto. The metal member extends past the ceramic liner to form a cylindrical portion. The ceramic nozzle portion is affixed in this cylindrical portion by a shrinkage-fit.
Inventors
- 👤 Mitsuyoshi Kawamura
- 👤 Masato Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:44
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/16; F02B19/165; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
An auxiliary combustion chamber for an internal combustion engine, said chamber comprising: (a) a chamber liner formed of a ceramic material that is an effective thermal insulator, said chamber liner having substantially hemispherical internal and external surfaces; (b) an outer metal member cast around said chamber liner, said outer member including a substantially hemispherical portion contacting said outer surface of said chamber liner and imparting a compressive stress to said chamber liner, said metal member further including a substantially cylindrical portion contiguous with the open end of said hemispherical portion and extending beyond said chamber liner, said cylindrical portion having an inner surface of a predetermined inside diameter at ambient temperature; and (c) a substantially cup-shaped nozzle portion formed of a heat-resistant ceramic material and having an orifice disposed in the bottom thereof to provide flow communication from a main combustion chamber to the interior of said auxiliary combustion chamber, said nozzle portion including a substantially cylindrical outer surface having a diameter greater than said predetermined inside diameter of said cylindrical portion of said metal member, said nozzle portion being shrink-fit within said cylindrical portion of said outer metal member with said cylindrical outer surface of said ceramic nozzle contacting said inner surface of said cylindrical portion of said metal member and said bottom of said nozzle portion being disposed away from said hemispherical portion of said metal member.
Claim 2
Dependent Claim
229 words
An auxiliary combustion chamber for an internal combustion engine, said chamber comprising: (a) a chamber liner formed of a ceramic material that is an effective thermal insulator, said chamber liner having substantially hemispherical internal and external surfaces; (b) an outer metal member cast around said chamber liner, said outer member including a substantially hemispherical portion contacting said outer surface of said chamber liner and imparting a compressive stress to said chamber liner, said metal member further including a substantially cylindrical portion contiguous with the open end of said hemispherical portion and extending beyond said chamber liner, said cylindrical portion having an inner surface of a predetermined inside diameter at ambient temperature; and (c) a substantially cup-shaped nozzle portion formed of a heat-resistant ceramic material and having an orifice disposed in the bottom thereof to provide flow communication from a main combustion chamber to the interior of said auxiliary combustion chamber, said nozzle portion including a substantially cylindrical outer surface having a diameter greater than said predetermined inside diameter of said cylindrical portion of said metal member, said nozzle portion being shrink-fit within said cylindrical portion of said outer metal member with said cylindrical outer surface of said ceramic nozzle contacting said inner surface of said cylindrical portion of said metal member and said bottom of said nozzle portion being disposed away from said hemispherical portion of said metal member.
Claim 3
Dependent Claim
18 words
The device of claim 1, wherein said ceramic material comprising said chamber liner is sintered, partially stabilized zirconia.
Claim 4
Dependent Claim
20 words
The device of claim 1, wherein said ceramic material comprising said nozzle portion is sintered Si 3 N 4 .
Claim 5
Dependent Claim
46 words
The device of claim 1 wherein said ceramic nozzle portion includes an annular recess in a portion of said outer surface thereof to provide an annular gap between said nozzle portion and a portion of said inner surface of said cylindrical portion of said metal member.
Claim 6
Dependent Claim
19 words
The device of claim 1, further comprising heat insulating means disposed between said nozzle portion and said metal member.
Claim 7
Dependent Claim
29 words
The device of claim 1 wherein said metal member includes means for engaging the edge of said ceramic liner at the open end of said substantially hemispherical ceramic liner.
Claim 8
Dependent Claim
21 words
The device of claim 6 wherein said engaging means comprises an annular flange on the inner surface of said metal member.
References Cited (Backward Citations)
US2006613A
Cited
US2739578A
Cited
US2865346A
Cited
US2932289A
Cited
US3738333A
Cited
US4040393A
Cited
US4325334A
Cited
US4511612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |