US4164913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion chamber for an internal combustion engine of direct injection type
Assignee: Komatsu Ltd
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Filing: 1977-09-02
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Granted: 1979-08-21
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Expires: 1997-09-02
Abstract
Abstract A combustion chamber for an internal combustion engine of the direct injection type formed by a cylinder head, a cylinder liner and a piston head, the piston head having formed therein a cavity in which the air swirl can be produced by known means. A fuel injection nozzle is disposed substantially in the central part of said cavity for injecting jets of fuel radially against the cavity wall. Said cavity comprises an equilateral polygonal cavity formed in the upper part of said piston head and a toroidal cavity formed continuously to said polygonal cavity in the lower part of said piston head.
Inventors
- 👤 Kunihiko Komiyama
- 👤 Seikichi Kanai
- 👤 Masaru Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:12
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0645; F02B23/0648; F02B23/0651; F02B23/0672; F02B23/0678; F02B23/0681; F02B23/0696; F02B2275/00; F02B2275/14; F02B2275/40; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
In an internal combustion engine of the direct injection type including combustion chambers each defined by a cylinder head, a cylinder liner, and a piston head having a wall defining a cavity therein, means for producing air swirl in said cavity and fuel injection means each having a plurality of fuel injection nozzles, said fuel injection means being mounted substantially at the central part of said cavity, said nozzles being arranged to inject jets of fuel into said cavity radially against said cavity wall, the improvement wherein said cavity wall is constructed to define a generally equilateral polygonal cavity formed in the upper part thereof and a generally toroidal cavity formed in the lower part thereof, the ratio of the depth of said equilateral polygonal cavity to that of toroidal cavity being about 0.3 to about 1.2.
Claim 2
Dependent Claim
137 words
In an internal combustion engine of the direct injection type including combustion chambers each defined by a cylinder head, a cylinder liner, and a piston head having a wall defining a cavity therein, means for producing air swirl in said cavity and fuel injection means each having a plurality of fuel injection nozzles, said fuel injection means being mounted substantially at the central part of said cavity, said nozzles being arranged to inject jets of fuel into said cavity radially against said cavity wall, the improvement wherein said cavity wall is constructed to define a generally equilateral polygonal cavity formed in the upper part thereof and a generally toroidal cavity formed in the lower part thereof, the ratio of the depth of said equilateral polygonal cavity to that of toroidal cavity being about 0.3 to about 1.2.
Claim 3
Dependent Claim
54 words
The engine according to claim 1 wherein said fuel injection means is disposed to inject fuel obliquely against said wall at an angle ranging from about -5° to about 14° when measured downwardly relative to the plane extending from the nozzle to the boundary cavity wall connecting said polygonal cavity with said toroidal cavity.
Claim 4
Dependent Claim
17 words
The engine according to claim 2 wherein said fuel injection angle is about 0° to about 4°.
Claim 5
Dependent Claim
26 words
The engine according to claim 1 wherein the outermost radius of said toroidal cavity is larger than that of the circumscribed circle of said polygonal cavity.
Claim 6
Dependent Claim
26 words
The engine according to claim 1 wherein the outermost radius of said toroidal cavity is smaller than that of the inscribed circle of said polygonal cavity.
Claim 7
Dependent Claim
38 words
The engine according to claim 1 wherein the outermost radius of said toroidal cavity is larger than that of the inscribed circle of said polygonal cavity and smaller than that of the circumscribed circle of said polygonal cavity.
Claim 8
Dependent Claim
27 words
The engine according to claim 1 wherein the ratio of the depth of said polygonal cavity to that of toroidal cavity is about 0.5 to about 1.0.
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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |