EP0269641A1 - Kraftstoff-einspritzdüse für brennkraftmaschinen. - Google Patents
Kraftstoff-einspritzdüse für brennkraftmaschinen.Info
- Publication number
- EP0269641A1 EP0269641A1 EP87900650A EP87900650A EP0269641A1 EP 0269641 A1 EP0269641 A1 EP 0269641A1 EP 87900650 A EP87900650 A EP 87900650A EP 87900650 A EP87900650 A EP 87900650A EP 0269641 A1 EP0269641 A1 EP 0269641A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- heating conductor
- contact element
- injection nozzle
- jacket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
Definitions
- the invention relates to a fuel injection nozzle according to the preamble of the main claim.
- Injection nozzles of this type are easy to install because the incandescent body, together with the sleeve and the contact element as a prefabricated structural unit, can be inserted into the union nut from the open end thereof and pushed up to the support shoulder.
- the incandescent body is formed by a wire coil which is supported and contacted on the sleeve at its end remote from the contact element. This design requires a sleeve with internal projections, which make the manufacture more difficult and also hinder the flow of the air sucked in by the action of the injector.
- the arrangement according to the invention with the characterizing features of the main claim has the advantage that the sucked air can pass largely unhindered from the combustion chamber into the annular space formed between the sleeve and the incandescent body and that the sleeve does not have to have any internal projections.
- the sheathed heating conductor provided to form the incandescent body is a tried and tested component which can implement high electrical heating outputs.
- the assembly of the glow element consisting of the glow body, sleeve and contact element is further simplified if the outer ring jacket of the jacket heating conductor contacts the end of the inner resistance wire facing away from the contact element and is soldered to the sleeve at least at one point.
- a sharp kinking of the end section of the jacket heating conductor connected to the contact element with respect to the associated end area of the filament is avoided if this end area is arranged on the combustion chamber side and the filament extends towards the nozzle body against the direction of flow of the fuel.
- the end section of the sheathed heating conductor facing the contact element is designed as a so-called cold end, which opposes the heating current to a lower electrical resistance than the rest of the sheathed heating conductor.
- the sleeve, the connection end of the sheathed heating conductor, in particular the seal provided there, and the contact element are subjected to less thermal stress than when using a sheathed heating conductor without a cold end.
- One possible way of realizing a cold end of the jacket heating conductor is to use a material in the area of the jacket heating conductor with a lower electrical resistance than in the rest of the area, for example copper, and a transition zone that is as short as possible (connection point copper / heating conductor) to accomplish.
- Another preferred possibility is to produce different cross-sectional areas of the ring jacket and the inner resistance wire, in particular by hammering or pulling the corresponding part of the jacket heating conductor before winding. In the end, this results in a thickened end section compared to a design without a cold end, the larger surface of which is also effective in the sense of thermally relieving the seal on the jacket heating conductor and the contact element.
- the contact element in the measures described above for reducing the thermal load can also be formed directly by a thickened or inwardly directed edge of the sleeve.
- the assembly of the injection nozzle is simplified if the sheathed heating conductor, the sleeve carrying and contacting it, an insulating ceramic body resting on its upper end face and the contact element are prefabricated into an installation unit by soldering or gluing.
- FIG. 1 shows the part on the combustion chamber side of the first embodiment enlarged and in section
- FIG. 2 shows the incandescent body of the injection nozzle according to FIG. 1
- FIG. 3 shows the second embodiment using a section corresponding to FIG. 1. Description of the embodiments
- the injection nozzle according to FIGS. 1 and 2 has a nozzle body 10, in which, as is known, a valve seat is formed and a valve needle is displaceably mounted.
- the nozzle body 10 and an intermediate disk limiting the stroke of the valve needle are clamped by a union nut 1 to a nozzle holder, in which, among other things, a closing spring which presses the valve flange against the valve seat is accommodated.
- the nozzle body 10 is provided with a conical wall section 14 which merges into a flat end wall 16.
- the union nut 12 is extended on the combustion chamber side beyond the nozzle body 10 and is provided downstream of its end wall 16 with an inner support shoulder 18, against which an annealing attachment, designated as a whole by the reference number 20, bears.
- an annealing attachment designated as a whole by the reference number 20, bears.
- the latter has a filament 22 designed as a helix, which forms a passage 24 for the spray jets 26.
- the incandescent body 22 is dimensioned such that the spray jets do not wet the incandescent body 22, but do produce an injector effect, through which air is sucked from the combustion chamber into the interior of the incandescent body 22.
- the incandescent body 22 is surrounded by a metallic sleeve 30, which has a cylindrical section 32 of larger diameter and a cylindrical section 34 of smaller diameter. At the transition between sections 32 and 34, an annular shoulder 36 is formed, which rests on the support shoulder 18 of the union nut 1. Downstream of the support shoulder 18, the union nut 12 is provided with a bore section 38, which fits around the section 34 of the sleeve in a suitable and sealing manner.
- a metallic heat protection ring 40 is clamped deformed between the sleeve 30 and the nozzle body 10 and has an inner ring edge 42 presses sealingly against the end wall 16 of the nozzle body 10.
- the axially offset to the inner ring edge 42 of the outer ring edge 44 of the heat protection ring 40 is sealingly supported on an annular shoulder 46 in the interior of the sleeve 30 and presses this against the support shoulder 18 with the union nut 12 screwed on.
- the heat protection ring 40 protects the end wall 16 of the nozzle body 10 from the heat radiation of the incandescent body 22 and dissipates heat from the end wall 16 to the sleeve 30, from where it is dissipated to the motor housing via the union nut 12.
- the incandescent body 22 is formed by a jacket heating conductor of a known type, the central region of which is wound into a coil 50 (FIG. 2).
- the coil 50 is provided with two elongated connection ends 52, 54, both of which extend tangentially from the winding diameter.
- the connection end 52 is assigned to the end section 56 of the coil 50 on the combustion chamber side and is provided with an angled section 58, which is guided through a bore 60 in the sleeve 30 running parallel to the nozzle axis and is soldered in there in a sealing manner. Resistance wire and sheath are sealed to high temperature after the section 58 has been pushed through and soldered into the bore 60.
- the inner resistance wire 62 of the jacket heating conductor 22 is a bit free and its outer ring jacket 64 is led out.
- the end of the inner resistance wire 62 which is led out of the outer ring jacket 64 is soldered to a contact ring 66 which is fastened with the interposition of a ceramic insulating ring 68 on the upper end face of the sleeve 30.
- the attachment can be done by gluing or soldering.
- the insulating ring 68 and the contact ring 66 are arranged in the wedge-shaped annular space 70 between the conical wall section 14 of the nozzle body 10 and the union nut 12.
- the contact ring 66 is connected to a power supply sleeve 74, the design of which is not of interest here in detail and is described, for example, in DE-A 35 02 098.
- the coil 50 extends from its input-side end region 56 counter to the direction of flow of the fuel to the nozzle body 10, the winding diameter continuously becoming smaller.
- the second connection end 54 of the coil 50 is supported in a wall notch 72 inside the sleeve 30.
- the outer ring sheath 64 of the sheathed heating conductor 22 is contacted at the connection end 54 with the inner resistance wire 62 and itself serves as a ground conductor, which connects the end of the resistance wire 62 remote from the contact ring 66 to the sleeve 30 and via this to ground.
- the outer ring jacket 64 is soldered to the sleeve 30 at both ends.
- the jacket heating conductor 22 can be constructed in a cost-saving manner without cold ends, without the contact ring 66 being heated to an unacceptably high degree.
- the assembly of the injection nozzle takes place in such a way that first the sleeve 30 with the glow body 22, the insulating ring 68 and the contact ring 66 are closed. be prefabricated in one unit.
- the current supply sleeve 74 is then connected in an electrically conductive manner to the contact ring 66.
- This assembly is then inserted with the heat protection ring 40 plugged into the union nut 12 from above and pushed forward until the sleeve 30 strikes the support shoulder 18 of the union nut 12.
- the heat protection ring 40 is also clamped, as a result of which the entire glow plug assembly is held on the nozzle body 10 without play.
- the sleeve 30 could also be firmly connected to the union nut 12 by soldering or pressed into it.
- the injection nozzle according to FIG. 3 corresponds to the embodiment according to FIGS. 1 and 2 except for two deviations.
- One deviation is that in section 58a of the formed incandescent body 22a, both the outer ring jacket and the inner resistance wire 62a have a larger cross-sectional area than in the remaining part of the jacket heating conductor and that therefore the so-called cold end section 58a is less heated by the heating current than section 58 according to FIGS and 2.
- the second deviation of the injection nozzle according to FIG. 3 compared to the first exemplary embodiment consists in the fact that a separate contact ring 66 (FIG. 1) is completely dispensed with and that the inner resistance wire 62a of the jacket heating conductor 22a is directly connected to an edge 76 facing inwards Power supply sleeve 78 is soldered, which can be designed like the power supply sleeve 74 of Figure 1 otherwise.
- the elimination of a separate contact ring 66 is made possible by the lower thermal load which results from the formation of section 58a of the jacket heating conductor 22a of the cold end.
- the sleeve 30a, the incandescent body 22a, the insulating ring 68 expediently made of ceramic and the power supply sleeve 78 can also be prefabricated into a structural unit by soldering.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863617353 DE3617353A1 (de) | 1986-05-23 | 1986-05-23 | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
DE3617353 | 1986-05-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0269641A1 true EP0269641A1 (de) | 1988-06-08 |
EP0269641B1 EP0269641B1 (de) | 1989-10-11 |
Family
ID=6301456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87900650A Expired EP0269641B1 (de) | 1986-05-23 | 1987-01-15 | Kraftstoff-einspritzdüse für brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US4834043A (de) |
EP (1) | EP0269641B1 (de) |
JP (1) | JPS63503398A (de) |
DE (2) | DE3617353A1 (de) |
WO (1) | WO1987007335A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0855899B2 (de) † | 1996-07-17 | 2005-06-15 | L'oreal | Verdichtetes kosmetisches präparat und resultierender schaum |
US10950874B2 (en) | 2016-06-10 | 2021-03-16 | Nok Corporation | Gasket manufacturing method |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3731231A1 (de) * | 1987-09-17 | 1989-03-30 | Bosch Gmbh Robert | Einrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine |
US4932374A (en) * | 1989-06-21 | 1990-06-12 | General Motors Corporation | Fuel injector nozzle for internal combustion engine |
US5400969A (en) * | 1993-09-20 | 1995-03-28 | Keene; Christopher M. | Liquid vaporizer and diffuser |
US6102303A (en) * | 1996-03-29 | 2000-08-15 | Siemens Automotive Corporation | Fuel injector with internal heater |
US6109543A (en) * | 1996-03-29 | 2000-08-29 | Siemens Automotive Corporation | Method of preheating fuel with an internal heater |
US5758826A (en) * | 1996-03-29 | 1998-06-02 | Siemens Automotive Corporation | Fuel injector with internal heater |
US6289869B1 (en) | 1997-09-12 | 2001-09-18 | George D. Elliott | Electromagnetic fuel ram-injector and improved ignitor |
US6135360A (en) * | 1998-06-01 | 2000-10-24 | Siemens Automotive Corporation | Heated tip fuel injector with enhanced heat transfer |
US6422481B2 (en) | 1998-06-01 | 2002-07-23 | Siemens Automotive Corporation | Method of enhancing heat transfer in a heated tip fuel injector |
US6439191B1 (en) | 1999-11-12 | 2002-08-27 | George D. Elliott | Fuel ram-injector and igniter improvements |
US8499739B2 (en) * | 2006-08-31 | 2013-08-06 | Caterpillar Inc. | Injector having tangentially oriented purge line |
US8215100B2 (en) * | 2007-03-02 | 2012-07-10 | Caterpillar Inc. | Regeneration device having external check valve |
US8006482B2 (en) | 2007-03-02 | 2011-08-30 | Caterpillar Inc. | Method of purging fluid injector by heating |
US8484947B2 (en) | 2007-03-02 | 2013-07-16 | Caterpillar Inc. | Fluid injector having purge heater |
US7797932B2 (en) * | 2007-04-30 | 2010-09-21 | Cummins, Inc | Apparatus and system for enhancing aftertreatment regeneration |
US7958721B2 (en) | 2007-06-29 | 2011-06-14 | Caterpillar Inc. | Regeneration system having integral purge and ignition device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1641421A (en) * | 1925-07-24 | 1927-09-06 | Louis O French | Ignition device |
US2130365A (en) * | 1936-06-23 | 1938-09-20 | George M Paulson | Igniter for internal combustion engines |
CH233939A (de) * | 1942-03-12 | 1944-08-31 | Bosch Gmbh Robert | Glühdrahtkerze. |
GB964715A (en) * | 1961-04-15 | 1964-07-22 | Lodge Plugs Ltd | Improvements in or relating to heater plugs adapted to be fitted into the induction pipes of diesel engines for starting purposes |
DE3404708A1 (de) * | 1982-08-14 | 1985-08-14 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen |
DE3327773A1 (de) * | 1983-05-13 | 1984-11-15 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zur kraftstoffeinspritzung in brennraeume |
DE3335920A1 (de) * | 1983-10-03 | 1985-04-18 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen |
DE3404710A1 (de) * | 1984-02-10 | 1985-08-14 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen |
DE3414201A1 (de) * | 1984-04-14 | 1985-10-17 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zum einspritzen von kraftstoff in brennraeumen |
DE3502109A1 (de) * | 1985-01-23 | 1986-07-24 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
-
1986
- 1986-05-23 DE DE19863617353 patent/DE3617353A1/de not_active Ceased
-
1987
- 1987-01-15 US US07/156,863 patent/US4834043A/en not_active Expired - Fee Related
- 1987-01-15 JP JP62500586A patent/JPS63503398A/ja active Pending
- 1987-01-15 EP EP87900650A patent/EP0269641B1/de not_active Expired
- 1987-01-15 WO PCT/DE1987/000015 patent/WO1987007335A1/de active IP Right Grant
- 1987-01-15 DE DE8787900650T patent/DE3760754D1/de not_active Expired
Non-Patent Citations (1)
Title |
---|
See references of WO8707335A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0855899B2 (de) † | 1996-07-17 | 2005-06-15 | L'oreal | Verdichtetes kosmetisches präparat und resultierender schaum |
US10950874B2 (en) | 2016-06-10 | 2021-03-16 | Nok Corporation | Gasket manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
JPS63503398A (ja) | 1988-12-08 |
WO1987007335A1 (en) | 1987-12-03 |
DE3760754D1 (en) | 1989-11-16 |
US4834043A (en) | 1989-05-30 |
EP0269641B1 (de) | 1989-10-11 |
DE3617353A1 (de) | 1987-11-26 |
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Legal Events
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