US5201907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1992-06-25
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Granted: 1993-04-13
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Expires: 2012-06-25
Abstract
Abstract The engine is provided with an auxiliary chamber having an auxiliary chamber port with an opening communicated with the combustion chamber. The auxiliary chamber port is arranged to be opened or closed with an auxiliary chamber valve. The timing of closing the auxiliary chamber valve is in between a final stage of compression stroke in which the temperature within the cylinder becomes higher and an initial stage of explosion stroke. On the other hand, the timing of opening the auxiliary chamber valve is in a middle stage of the compression stroke, thereby allowing the mixed fuel cooled in the auxiliary chamber to be replaced with a portion of the mixed fuel in the combustion chamber, thereby lowering the temperature within the cylinder.
Inventors
- 👤 Mitsuo Hitomi
- 👤 Shunji Masuda
- 👤 Toshihiko Hattori
- 👤 Kenji Kashiyama
- 👤 Junsou Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:39
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/02; F02B29/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
101 words
An internal combustion engine, comprising: an auxiliary chamber having an opening communicated to a combustion chamber of the internal combustion engine; and an auxiliary chamber valve for opening or closing the opening of said auxiliary chamber to the combustion chamber; wherein a timing of opening or closing said auxiliary chamber valve is set in such a manner that said auxiliary chamber valve is opened in a middle stage of a compression stroke and closed in a final stage of the compression stroke or in an initial stage of explosion stroke so as to cool a charge accepted by said auxiliary chamber.
Claim 2
Dependent Claim
101 words
An internal combustion engine, comprising: an auxiliary chamber having an opening communicated to a combustion chamber of the internal combustion engine; and an auxiliary chamber valve for opening or closing the opening of said auxiliary chamber to the combustion chamber; wherein a timing of opening or closing said auxiliary chamber valve is set in such a manner that said auxiliary chamber valve is opened in a middle stage of a compression stroke and closed in a final stage of the compression stroke or in an initial stage of explosion stroke so as to cool a charge accepted by said auxiliary chamber.
Claim 3
Dependent Claim
19 words
An internal combustion engine as claimed in claim 1, wherein said engine is a 4-cycle engine of Otto type.
Claim 4
Dependent Claim
16 words
An internal combustion engine as claimed in claim 1, wherein said engine is a diesel engine.
Claim 5
Dependent Claim
19 words
An internal combustion engine as claimed in claim 1, wherein said engine is an engine of natural intake type.
Claim 6
Dependent Claim
22 words
An internal combustion engine as claimed in claim 1, wherein said engine is an engine of a type of charging intake air.
Claim 7
Dependent Claim
29 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber valve is adapted to be opened or closed at least at the time of high load.
Claim 8
Dependent Claim
38 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber valve is adapted to be opened or closed at the time of high load only and to be closed at the time of low load.
Claim 9
Dependent Claim
25 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber valve is adapted to be opened or closed in all load region.
Claim 10
Dependent Claim
26 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber valve is driven to be opened or closed with an engine output axle.
Claim 11
Dependent Claim
30 words
An internal combustion engine as claimed in claim 9, wherein said auxiliary chamber valve is driven to be opened or closed with the engine output axle through a cam shaft.
Claim 12
Dependent Claim
29 words
An internal combustion engine as claimed in claim 10, wherein a clutch is disposed in a passage for transmitting power between said engine output axle and said cam shaft.
Claim 13
Dependent Claim
25 words
An internal combustion engine as claimed in claim 11, wherein said clutch is coupled or decoupled in accordance with a running state of said engine.
Claim 14
Dependent Claim
58 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber valve is shifted between its operating state in which said auxiliary chamber valve is operated to be opened or closed and its rest state in which said auxiliary chamber valve is held in its closed state, in accordance with a running state of the engine.
Claim 15
Dependent Claim
22 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber is formed in a cylinder head of the engine.
Claim 16
Dependent Claim
27 words
An internal combustion engine as claimed in claim 1, wherein said auxiliary chamber is disposed through an outside casing mounted to a cylinder head of the engine.
Claim 17
Dependent Claim
55 words
An internal combustion engine as claimed in claim 15, wherein: said auxiliary chamber formed in the outside casing is communicated with the combustion chamber through a connecting passage formed in the cylinder head; and said auxiliary chamber valve is adapted to open or close an opening of said connecting passage communicated with the combustion chamber.
Claim 18
Dependent Claim
27 words
An internal combustion engine as claimed in claim 1, wherein a timing of closing said auxiliary chamber valve is in a final stage of a compression stroke.
Claim 19
Dependent Claim
72 words
An internal combustion engine as claimed in claim 1, wherein: the engine is of a 4-cycle Otto type; and an air-fuel ratio of a mixed fuel to be supplied to the combustion chamber is set to be leaner than a stoichiometric air-fuel ratio at the time of low load and the air-fuel ratio thereof is set to be richer in accordance with an increase in load at the time of high load.
Claim 20
Dependent Claim
32 words
An internal combustion engine as claimed in claim 18, wherein said auxiliary chamber valve is operated to be opened or closed in (all load) region other than the time of high load.
Claim 21
Dependent Claim
29 words
An internal combustion engine as claimed in claim 18, wherein said auxiliary chamber valve is operated to be opened or closed at least at the time of high load.
Claim 22
Dependent Claim
40 words
An internal combustion engine as claimed in claim 18, wherein said auxiliary chamber valve is operated to be opened or closed at the time of high load only and held in its closed state at the time of low load.
Claim 23
Dependent Claim
48 words
An internal combustion engine as claimed in claim 18, wherein the air-fuel ratio of the mixed fuel to be supplied to the combustion chamber is leaner than the stoichiometric air-fuel ratio at the time of high load when the load becomes higher than a predetermined magnitude of load.
Claim 24
Dependent Claim
61 words
An internal combustion engine as claimed in claim 18, wherein said auxiliary chamber valve is operated to be opened or closed only at the time of high load where a pressure of intake air becomes approximately atmospheric pressure or higher and said auxiliary chamber valve is held in its closed state when the pressure of intake air is outside said pressure.
Claim 25
Dependent Claim
22 words
An internal combustion engine as claimed in claim 18, wherein means for supplying fuel to the engine is a fuel injection valve.
Claim 26
Dependent Claim
28 words
An internal combustion engine as claimed in claim 18, wherein said air-fuel ratio is adapted so as to be continuously variable in accordance with a variation in load.
Claim 27
Dependent Claim
44 words
An internal combustion engine as claimed in claim 25, wherein said air-fuel ratio is set at the time of low load to become gradually leaner as the load increases and at the time of high load to become gradually richer as the load increases.
Claim 28
Dependent Claim
27 words
An internal combustion engine as claimed in claim 18, wherein the timing of closing said auxiliary chamber valve is in a final stage of a compression stroke.
Claim 29
Dependent Claim
28 words
An internal combustion engine as claimed in claim 27, wherein the timing of closing said auxiliary chamber valve is set to comply approximately with a timing of ignition.
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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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |