US4747384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system
Assignee: Robert Bosch GmbH
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Filing: 1986-11-24
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Granted: 1988-05-31
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Expires: 2006-11-24
Abstract
Abstract A fuel injection system for internal combustion systems is proposed, which serves to inject fuel into the intake tube of the engine. The fuel injection system includes at least one fuel injection valve which is disposed in the interior of a holder and communicates with both a fuel supply line and a fuel drainage line. The inflow of fuel into the fuel injection valve takes place radially via an inflow region. An orifice body is secured in the holder, forming a reservoir preceding the inflow region. In the first few seconds after hot starting of the engine, only the fuel stored in the reservoir reaches the inflow region and hence is injected. Because readily volatile fuel components have evaporated beforehand, the fuel stored in the reservoir enables especially good fuel preparation.
Inventors
- 👤 Udo Hafner
- 👤 Heinrich Knapp
- 👤 Rudolf Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:29
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/14; F02M61/145; F02M69/00; F02M69/04; F02M69/042; F02M69/044; F02M69/46
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
193 words
A fuel injection system for internal combustion engines comprising an air intake tube and at least one fuel injection valve having at least one wall disposed in a guide bore, a nozzle body that serves to inject fuel into said air intake tube, said fuel injection valve and guide bore arranged to define an interior which is supplied with fuel through a fuel supply inlet opening, an orifice body (30) arranged to surround a portion of said fuel injection valve (1) in a spaced-apart manner, said orifice body, (30) including a terminal end in a direction extending upwardly away from said nozzle body (2) in the vicinity of said at least one wall of said fuel injection valve (1), thereby forming an annular flow-through region (33, 47) with the fuel injection valve (1), a filter (24) upstream from said nozzle having a portion thereof that extends into an area surrounded by a portion of said orifice body, and said terminal end of said orifice body and flowthrough region is located in an axial direction above said fuel supply inlet opening whereby fuel must flow upward from said inlet opening into said orifice body.
Claim 2
Dependent Claim
193 words
A fuel injection system for internal combustion engines comprising an air intake tube and at least one fuel injection valve having at least one wall disposed in a guide bore, a nozzle body that serves to inject fuel into said air intake tube, said fuel injection valve and guide bore arranged to define an interior which is supplied with fuel through a fuel supply inlet opening, an orifice body (30) arranged to surround a portion of said fuel injection valve (1) in a spaced-apart manner, said orifice body, (30) including a terminal end in a direction extending upwardly away from said nozzle body (2) in the vicinity of said at least one wall of said fuel injection valve (1), thereby forming an annular flow-through region (33, 47) with the fuel injection valve (1), a filter (24) upstream from said nozzle having a portion thereof that extends into an area surrounded by a portion of said orifice body, and said terminal end of said orifice body and flowthrough region is located in an axial direction above said fuel supply inlet opening whereby fuel must flow upward from said inlet opening into said orifice body.
Claim 3
Dependent Claim
19 words
A fuel injection system as defined by claim 1, in which said orifice body (30) comprises a follow cylinder.
Claim 4
Dependent Claim
23 words
A fuel injection system as defined by claim 2, in which said orifice body (30) further includes a portion which is slit longitudinally.
Claim 5
Dependent Claim
30 words
A fuel injection system as defined by claim 1, in which said orifice body (30) is disposed in a bore (27) which is contiguous with the guide bore (4, 6).
Claim 6
Dependent Claim
30 words
A fuel injection system as defined by claim 1, in which said guide bore (4, 6) is embodied in a holder means (5) that protrudes into said air intake tube.
Claim 7
Dependent Claim
30 words
A fuel injection system as defined by claim 4, in which said guide bore (4, 6) is embodied in a holder means (5) that protrudes into said air intake tube.
Claim 8
Dependent Claim
26 words
A fuel injection system as defined by claim 1, in which said guide bore (4, 6) is embodied in a wall of the air intake tube.
Claim 9
Dependent Claim
26 words
A fuel injection system as defined by claim 4, in which said guide bore (4, 6) is embodied in a wall of the air intake tube.
Claim 10
Dependent Claim
164 words
A fuel injection system for internal combustion engines comprising an air intake tube and at least one fuel injection valve having at least one wall disposed in a guide bore, a nozzle body that serves to inject fuel into said air intake tube, said fuel injection valve and guide bore arranged to define an interior which is supplied with fuel through a fuel supply opening, an insert (38) which is positioned between a portion of the fuel injection valve (1) and a bore (37) contiguous with the guide bore (4, 6), an orifice body (30) formed by a portion of said insert and arranged to partly surround said fuel injection valve (1) in a spaced-apart manner, said orifice body (30) arranged to terminate in a direction extending upwardly away from said nozzle body (2) in the vicinity of said at least one wall of said fuel injection valve (1), thereby forming at least one flowthrough region (33, 47) with the fuel injection valve (1).
Claim 11
Dependent Claim
164 words
A fuel injection system for internal combustion engines comprising an air intake tube and at least one fuel injection valve having at least one wall disposed in a guide bore, a nozzle body that serves to inject fuel into said air intake tube, said fuel injection valve and guide bore arranged to define an interior which is supplied with fuel through a fuel supply opening, an insert (38) which is positioned between a portion of the fuel injection valve (1) and a bore (37) contiguous with the guide bore (4, 6), an orifice body (30) formed by a portion of said insert and arranged to partly surround said fuel injection valve (1) in a spaced-apart manner, said orifice body (30) arranged to terminate in a direction extending upwardly away from said nozzle body (2) in the vicinity of said at least one wall of said fuel injection valve (1), thereby forming at least one flowthrough region (33, 47) with the fuel injection valve (1).
Claim 12
Dependent Claim
44 words
A fuel injection system as defined by claim 9 in which said orifice body further includes a plurality of detents (43) said detents being provided with inwardly directed protrusions (44), which snap into a retaining groove (45) machined into said fuel injection valve (1).
Claim 13
Dependent Claim
30 words
A fuel injection system as defined by claim 9 in which said guide bore (4, 6) is embodied in a holder means (5) that protrudes into said air intake tube.
Claim 14
Dependent Claim
26 words
A fuel injection system as defined by claim 9, in which said guide bore (4, 6) is embodied in a wall of the air intake tube.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |