US3919982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion chamber of a spark ignition engine
Assignee: Toyota Motor Corp
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Filing: 1973-07-23
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Granted: 1975-11-18
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Expires: 1993-07-23
Abstract
Abstract An improved combustion chamber of a direct cylinder fuel injection type spark-ignition internal combustion engine, wherein a plurality of holes are provided in at least one of the upper face of a piston and the lower face of a cylinder head in a uniformly scattered fashion, and wherein a fuel injector is positioned to inject fuel into that portion of the combustion chamber which is remote from said holes, to thereby form a layer of a rich air-fuel mixture in that portion, while a contiguous layer of a lean air-fuel mixture is formed adjacent to said holes. The combustion chamber is so constructed as to ensure the minimized formation of nitrogen oxide and the complete combustion of uncombusted hydrocarbon and carbon monoxide during the operation of the engine.
Inventors
- 👤 Kenji Goto
- 👤 Takao Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:16
CPC Classifications
F; F02; F02B; F02B3/00; F02B3/02; F02B3/04; F02B17/00; F02B17/005; F02B21/00; F02B23/00; F02B23/08; F02B23/10; F02B23/104; F02B23/105; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/12; F02B2075/125; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S123/00; Y10S123/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
174 words
In the combustion chamber, of a direct fuel injection type spark-ignition internal combustion engine, defined by and between the face of a piston facing a cylinder head and the face of the cylinder head facing the piston, the improvement comprising: a plurality of uniformly scattered holes in at least one of said piston and cylinder head, each of said holes opening at one end thereof into said chamber and the other end thereof being closed, said holes being adapted to receive air therein upon introduction of air into said chamber, the cross-sectional area of the open end of said holes being no smaller than that of the closed end thereof to let out the air therefrom without causing turbulence in said chamber upon movement of said piston away from said cylinder head; a fuel injector for injecting fuel into a portion of said chamber relatively remote from said holes whereby fuel is prevented from entering said holes; and a spark plug, the spark gap of which is located in said portion of said chamber.
Claim 2
Dependent Claim
174 words
In the combustion chamber, of a direct fuel injection type spark-ignition internal combustion engine, defined by and between the face of a piston facing a cylinder head and the face of the cylinder head facing the piston, the improvement comprising: a plurality of uniformly scattered holes in at least one of said piston and cylinder head, each of said holes opening at one end thereof into said chamber and the other end thereof being closed, said holes being adapted to receive air therein upon introduction of air into said chamber, the cross-sectional area of the open end of said holes being no smaller than that of the closed end thereof to let out the air therefrom without causing turbulence in said chamber upon movement of said piston away from said cylinder head; a fuel injector for injecting fuel into a portion of said chamber relatively remote from said holes whereby fuel is prevented from entering said holes; and a spark plug, the spark gap of which is located in said portion of said chamber.
Claim 3
Dependent Claim
185 words
A direct fuel injection spark-ignition internal combustion engine comprising: a cylinder, a cylinder head for said cylinder, a piston in said cylinder, a combustion chamber defined by and between the face of said piston facing said cylinger head and the face of said cylinder head facing said piston, a plurality of uniformly scattered holes in at least one of said piston and said cylinder head, each of said holes opening at one end thereof into said chamber and the other end thereof being closed, said holes being adapted to receive air therein upon introduction of air into said chamber, the cross-sectional area of the open end of each of said holes being no smaller than that of the closed end thereof to let out the air therefrom without causing turbulence in said chamber upon movement of said piston away from said cylinder head, a fuel injector for injecting fuel into a portion of said chamber relatively remote from said holes whereby fuel is prevented from entering said holes, and a spark plug, the spark gap of which is located in said portion of said chamber.
Claim 4
Dependent Claim
185 words
A direct fuel injection spark-ignition internal combustion engine comprising: a cylinder, a cylinder head for said cylinder, a piston in said cylinder, a combustion chamber defined by and between the face of said piston facing said cylinger head and the face of said cylinder head facing said piston, a plurality of uniformly scattered holes in at least one of said piston and said cylinder head, each of said holes opening at one end thereof into said chamber and the other end thereof being closed, said holes being adapted to receive air therein upon introduction of air into said chamber, the cross-sectional area of the open end of each of said holes being no smaller than that of the closed end thereof to let out the air therefrom without causing turbulence in said chamber upon movement of said piston away from said cylinder head, a fuel injector for injecting fuel into a portion of said chamber relatively remote from said holes whereby fuel is prevented from entering said holes, and a spark plug, the spark gap of which is located in said portion of said chamber.
Claim 5
Dependent Claim
21 words
The internal combustion engine as claimed in claim 2 wherein: said holes are of constant depth and of the same diameter.
Claim 6
Dependent Claim
30 words
The internal combustion engine as claimed in claim 2 wherein: said holes are in said piston and are scattered over substantially the entire area of said face of said piston.
Claim 7
Dependent Claim
56 words
The internal combustion engine as claimed in claim 2 wherein: said holes are in said cylinder head, an inlet valve opening in said cylinder head, an exhaust valve opening in said cylinder head, and said holes are scattered over substantially the entire area of said face of cylinder head other than the area containing said openings.
Claim 8
Dependent Claim
27 words
The internal combustion engine as claimed in claim 5 wherein: each opening is of a diameter substantially larger than the cross-sectional area of each of said holes.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |