Patent US4671234A successfully refreshed from Google Patents.
US4671234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection system of an internal combustion engine
Assignee: Daimler Benz AG
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Filing: 1986-03-12
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Granted: 1987-06-09
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Expires: 2006-03-12
Abstract
Abstract An injection system for an internal-combustion engine has a plurality of separate inlet ports provided for each cylinder of the engine, and an intake pipe encompassing the inlet ports for each cylinder. The intake pipe has a subdividing web wall in the region of the cylinder head having a mixing chamber into which fuel is injected by an injection nozzle. The subdividing web wall subdivides the intake pipe into separate intake pipe sections and includes shot channels for communicating fuel from the mixing chamber to each of the separate intake pipe sections. By this arrangement, a constant, thorough mixing of the fuel/air mixture is achieved even at lower load and upper speed ranges of the engine.
Inventors
- 👤 Dietrich Tegtmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:48
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/104; F02M35/108; F02M35/10006; F02M35/10072; F02M35/10209; F02M35/10216; F02M35/10242; F02M35/10262; F02M35/1085; F02M69/00; F02M69/04; F02M69/042; F02M69/044; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
Apparatus for an injection system for an internal-combustion engine with a plurality of separate inlet ports provided for each cylinder of the engine, intake pipe means encompassing said plurality of inlet ports, and at least one downstream injection nozzle in said intake pipe means said intake pipe arrangement comprising: subdividing means in the region of a cylinder head, for subdividing said intake pipe means into separate intake pipe sections; said subdividing means having a mixing chamber into which fuel is injected by said at least one downstream injection nozzle means, and shot channel means for communicating fuel from said mixing chamber to each of said separate intake pipe sections.
Claim 2
Dependent Claim
109 words
Apparatus for an injection system for an internal-combustion engine with a plurality of separate inlet ports provided for each cylinder of the engine, intake pipe means encompassing said plurality of inlet ports, and at least one downstream injection nozzle in said intake pipe means said intake pipe arrangement comprising: subdividing means in the region of a cylinder head, for subdividing said intake pipe means into separate intake pipe sections; said subdividing means having a mixing chamber into which fuel is injected by said at least one downstream injection nozzle means, and shot channel means for communicating fuel from said mixing chamber to each of said separate intake pipe sections.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1, wherein said fuel is injected into said mixing chamber when said engine is idling and operating at a partial load.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1, further comprising at least one upstream injection nozzle means disposed upstream of said subdividing means.
Claim 5
Dependent Claim
32 words
The apparatus of claim 3, wherein said upstream injection nozzle means injects fuel into said intake pipe means when said engine is operating at an upper partial load and at full load.
Claim 6
Dependent Claim
21 words
The apparatus of claim 3, further comprising at least one downstream injection nozzle means for injecting fuel into said mixing chamber.
Claim 7
Dependent Claim
19 words
The apparatus of claim 1, further comprising an idle air port means for communicating air to said mixing chamber.
Claim 8
Dependent Claim
32 words
The apparatus of claim 6, wherein said idle air port means is a bore through said subdividing means, with openings at said mixing chamber and an underside of said intake pipe means.
Claim 9
Dependent Claim
13 words
The apparatus of claim 1, wherein said subdividing means is a web wall.
Claim 10
Dependent Claim
32 words
The apparatus of claim 1, wherein a central longitudinal axis of one said shot channel means forms an acute angle α with a central longitudinal axis of another said shot channel means.
Claim 11
Dependent Claim
28 words
The apparatus of claim 9, wherein a central longitudinal axis of said at least one downstream injection nozzle lies in a plane formed by said acute angle α.
Claim 12
Dependent Claim
21 words
The apparatus of claim 1, further comprising at least one downstream injection nozzle means for injecting fuel into said mixing chamber.
References Cited (Backward Citations)
US4313410A
Cited
US4614174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |