Patent US3797466A successfully refreshed from Google Patents.
US3797466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection internal combustion engine
Assignee: Nissan Motor Co Ltd
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Filing: 1971-07-21
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Granted: 1974-03-19
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Expires: 1991-07-21
Abstract
Abstract To make available a fuel internal combustion engine which can be driven with a relatively lean combustible mixture to reduce concentrations of toxic hydrocarbons, carbon-monoxides and nitrogen oxides in engine exhaust gases without impairing combustion efficiency of the engine, the engine is provided with an improved combustion chamber which consists of a usual space usually used as the combustion chamber and an additional space formed in an end wall of a piston. A fuel injection valve and a spark plug spaced from the valve are located in alignment with this additional space so that a major portion of the supplied fuel is distributed to the additional space so as to produce therein a relatively rich combustible mixture which can be readily ignited by the spark plug whereby a relatively lean mixture produced in the usual space of the combustion chamber is ignited by the aid of the flames resulting from the combustion of the rich mixture.
Inventors
- 👤 S Nambu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:49
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/26; F02B; F02B23/00; F02B23/08; F02B23/10; F02B2023/102; F02B2023/108; F02B75/00; F02B75/12; F02B2075/125; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
212 words
A fuel injection internal combustion engine for motor vehicles in which each cylinder arrangement comprises: a cylinder; a cylinder head mounted on said cylinder, said cylinder head defining a flat plane which defines the upper limits of the cylinder; an air intake passage having a downstream end portion curved and opening into said cylinder at said cylinder head to provide a curved flow of air in said cylinder; a piston within said cylinder to provide a space between said cylinder head and said piston, said piston having formed in its end wall facing said cylinder head a groove which is immediately contiguous to said space to provide a combustion chamber, said groove extending along said flow of air and having an upstream portion and a downstream portion with respect to said flow of air; a fuel injection nozzle mounted in said cylinder head and disposed above said upstream portion; a spark plug mounted in said cylinder head and having a central electrode projecting into said groove at said downstream portion when said piston is at top dead center; an exhaust port leading from said combustion chamber and opened to the open air; and wherein said groove is curved about an axis of said piston to form a curved groove having closed end.
Claim 2
Dependent Claim
212 words
A fuel injection internal combustion engine for motor vehicles in which each cylinder arrangement comprises: a cylinder; a cylinder head mounted on said cylinder, said cylinder head defining a flat plane which defines the upper limits of the cylinder; an air intake passage having a downstream end portion curved and opening into said cylinder at said cylinder head to provide a curved flow of air in said cylinder; a piston within said cylinder to provide a space between said cylinder head and said piston, said piston having formed in its end wall facing said cylinder head a groove which is immediately contiguous to said space to provide a combustion chamber, said groove extending along said flow of air and having an upstream portion and a downstream portion with respect to said flow of air; a fuel injection nozzle mounted in said cylinder head and disposed above said upstream portion; a spark plug mounted in said cylinder head and having a central electrode projecting into said groove at said downstream portion when said piston is at top dead center; an exhaust port leading from said combustion chamber and opened to the open air; and wherein said groove is curved about an axis of said piston to form a curved groove having closed end.
Claim 3
Dependent Claim
21 words
A fuel injection internal combustion engine as claimed in claim 1, wherein said groove extends annularly to form an annular groove.
Claim 4
Dependent Claim
43 words
A fuel injection internal combustion engine as claimed in claim 1, wherein said fuel injection valve is angled to admit fuel into said combustion chamber in a direction substantially in line with the direction in which said groove extends toward said central electrode.
References Cited (Backward Citations)
GB397840A
Cited
US3079901A
Cited
US3102521A
Cited
FR1283739A
Cited
US3400701A
Cited
US3658046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |