EP0267199A1 - Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine. - Google Patents
Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine.Info
- Publication number
- EP0267199A1 EP0267199A1 EP87900647A EP87900647A EP0267199A1 EP 0267199 A1 EP0267199 A1 EP 0267199A1 EP 87900647 A EP87900647 A EP 87900647A EP 87900647 A EP87900647 A EP 87900647A EP 0267199 A1 EP0267199 A1 EP 0267199A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- incandescent
- glow
- combustion chamber
- incandescent body
- 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
- 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
-
- 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
Definitions
- the invention relates to a device for injecting fuel according to the type of the main claim.
- a device of this type P 35 02 110.1
- the annular shoulder which holds and contacts the combustion chamber end of the incandescent body, on the sleeve of the injection nozzle is turned, that is to say opposed to the fuel flow , so that the incandescent body must be inserted into the sleeve from the end of the sleeve assigned to the injection nozzle.
- the contact ring disk which holds and contacts the end of the incandescent body remote from the combustion chamber can only be attached after the incandescent body has been inserted, which may be the case. the assembly of the Tei ⁇ le difficult.
- the arrangement according to the invention with the characterizing features of the main claim has the advantage that the incandescent body can be inserted into the sleeve from the end of the sleeve facing the combustion chamber, so that the contact ring washer is attached to the sleeve before the incandescent body is inserted and with this can be prefabricated into a structural unit.
- the measures contained in the subclaims allow advantageous developments of the arrangement according to the main claim.
- the incandescent body has an outer diameter which is continuously reduced towards the injection nozzle.
- the end of the incandescent body on the combustion chamber side can be connected to the sleeve and contacted if the sleeve is designed according to claim 7.
- the sheet metal body can be arranged together with ceramic bodies arranged on both sides of the contact ring disk, for the insulated fastening thereof, which makes the sleeve easier, cheaper and can also take better account of the limited space available than when using a machined sleeve .
- the incandescent body is wound from a flat strip according to claims 8 and 9, which is separated from a flat sheet metal body (plate, strip) in the form of a spiral and is then axially pulled apart to form a conical coil.
- the two contact rings at the end are lent workload.
- This design of the incandescent body has the advantage that the filament can consist of a special material that is only available in sheet or strip form, and that flat, extending surfaces that extend over a closed circular circumference are available on the filament, which ensure a secure Easily facilitate attachment and contacting.
- the overall height of the assembly formed from the sleeve, the contact ring disk and the two insulating bodies can be further reduced.
- FIG. 1 shows an enlarged longitudinal section through the end of an injection nozzle with integrated glow insert as the first embodiment
- FIG. 2 shows a plan view of the glow plug of the glow insert according to FIG. 1 in an intermediate stage of manufacture
- FIG. 3 shows one of FIG. 1 corresponding section through the second embodiment
- Figure 4 is a partial view of the contact washer according to Figure 3 in the direction of arrow A. shown there
- 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 delimiting the stroke of the valve needle are clamped by a union nut 12 to a nozzle holder in which, among other things, a closing spring pressing the valve needle 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 holder 10 and is provided downstream of its end wall 16 with an inner support shoulder 18 against which an annealing insert, designated as a whole by the reference number 20, bears.
- this has a filament 22 designed as a filament, 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, but do produce an injector effect, through which air is sucked in from the combustion chamber into the interior of the incandescent body 22 and the edge zones of the spray jets passing through the incandescent body.
- the incandescent body 22 is surrounded by a metallic sleeve 30 which has a flange 32 which rests on the support shoulder 18 of the union nut 12.
- the sleeve 30 is provided with an inwardly directed annular collar 34 on which the incandescent body 22 is supported in a centered manner and e.g. is soldered on.
- the union nut 12 Downstream of the support shoulder 18, the union nut 12 has an enlarged bore section 36 in an annular collar 38, which surrounds the end face of the sleeve 30 and the incandescent body 22 in a protective manner.
- the sleeve 30 is provided with a plurality of uniformly distributed bores 40 in the jacket wall, which open into the enlarged bore section 36 of the union nut 12.
- a first ring-shaped insulating body 44, a metallic contact ring disk 46, a second ring-shaped insulating body 48 and a metallic support disk 50 are superimposed on the sleeve 30. These parts are connected together and dc "r sleeve 30 fixed ver ⁇ connected, for example by soldering, when using on the flat end sides metallized ceramic bodies as an insulating body 44, 48.
- the upstream end of the incandescent zone 22 is on an inner Ring ⁇ 52 of the contact ring disk 46 soldered, with several uniformly distributed openings 54 are seen in the central ring area.
- the contact ring disk 46 is provided with three raised contact lugs 56 which are offset by 120 ° to one another and are conductively connected to a power supply sleeve 58 which is insulated through the annular gap between the nozzle body 10 and the union nut 12 to a higher connection point one outer lead extends.
- a deformed metallic heat protection ring 60 is clamped between the support disk 50 and the nozzle body 10 and presses with an inner ring edge 62 against the end wall 16 of the nozzle body 10.
- a central ring region 64 of the heat protection ring 60 which is offset axially to the inner ring edge 62, bears against the support disk 50 and an outer ring edge 66 bears against the conical wall section 14 of the nozzle body 10.
- the heat protection ring 60 is centered on the nozzle body 10 and the passage 24 is properly sealed against the chamber 68 surrounding the glow insert 20 above the support shoulder 18.
- annular space 70 is formed, which is connected to the combustion chamber via the bores 40 in the sleeve 30 and the expanded bore section 36 of the union nut 12.
- the spray jets 26 suck in air from the combustion chamber by the action of an injector, which, heated on the heating body 22, reaches the edge zones of the spray jets and forms an easily flammable fuel-air mixture there.
- the injector effect of the spray jets 26 is improved by the design of the incandescent body 22 which is well adapted to the beam shape.
- the air entry into the spray jets is made uniform over the entire length of the incandescent body 22 and the insulating bodies 44, 48 or their connection points with the adjacent metallic parts are thermally relieved.
- the conical design also improves the dynamic behavior of the filament and reduces the risk of breakage.
- the prefabricated structural unit formed from the parts 22, 30 and 44 to 50 is inserted into the union nut 12 from the upstream side and pushed forward until it rests on the support shoulder 18.
- the sleeve 30 can then be glued or soldered or welded to the union nut 12 at a suitable point.
- the injection nozzle is then expediently installed in such a way that the nozzle holder, the intermediate disk and the nozzle body 10 are placed on top of one another, the heat protection ring 60 is placed on the nozzle body 10 and then the union nut 12 together with the glow insert 20 is put on the parts and screwed onto the nozzle holder , wherein the tensing heat protection ring 60 is held centered on the nozzle holder 10.
- the incandescent body 22 is wound from a flat strip 72 (FIG. 2), so that the individual turns have a rectangular cross section.
- the flat strip 72 is cut out in the form of a spiral from a flat sheet metal body and then pulled apart in the axial direction of the incandescent body 22 to form the conical coil.
- the spiral can be separated from the flat sheet metal body, for example by etching or, as shown in FIG. 2, by laser cutting.
- the flat starting part is a sheet metal strip 74, from which the spiral flat strip 72 is separated by a cutting line 76, which begins at 78 and ends at 80.
- an inner circular cutting line 82 and an outer circular cutting line 84 are provided, by means of which the spiral is separated from the sheet metal strip 74.
- the glow body 22 receives at its ends an inner closed contact ring 86 and an outer closed contact ring 88, with which the glow body 22 on the contact ring disk 46 and the sleeve 30 is contacted.
- the described design of the incandescent body 22 results in flat contact surfaces between the parts to be contacted, which also extend over an entire circumference and therefore enable an excellent contacting and fastening.
- the inwardly directed annular collar 34 of the sleeve 30 has an annular shoulder 90 which is turned away from the nozzle body 10 and surrounds a through-opening 91, the inside diameter of which is smaller than the outer diameter of the contact ring 88 of the incandescent body 22.
- the outer diameter of all other turns of the incandescent body 22 are smaller than the inside diameter of the push-through opening 91, so that the incandescent body 22 can be inserted into the sleeve 30 from the end toward the combustion chamber until its contact rings 86, 88 on the already attached contact ring disk 46 and the ring shoulder 90 of the sleeve 30 come to rest. Thereafter, the incandescent body 22 can be removed using suitable methods, e.g. can be connected and contacted with the contact ring disk 46 and the sleeve 30 by laser welding.
- the device according to FIGS. 3 and 4 which is basically the same as that according to FIGS. 1 and 2, has a glow body 92 wound from round wire, the two end windings 93, 94 of which are as large as possible in a direction perpendicular to the axis of the incandescent body 22 are arranged level. With regard to the end turn 94, which is smaller in diameter, this is supported by the fact that the adjacent turn 95 has a greater helical pitch than the other turns.
- the sleeve surrounding the glow body 92 is L here formed by a cup-shaped sheet metal body 96, which 'rests with a flange 97 on the shoulder 18a of the union nut 12a.
- two ceramic insulating bodies 44, 48 and a contact ring disk 98 are connected to the flange 97 and hold and contact the upper end turn 94 of the glow body 92 in a centered manner.
- the inner ring edge 99 of the contact ring disk 98 is provided with an axial collar 100 which has a cylindrical shape before the glow body 92 is inserted and which is adapted to the inner diameter of the end turn 94.
- the contact ring disk 98 is provided with eight recesses 101, which are evenly distributed over the circumference, through which the sucked-in air can also enter the ring roughness lying between the incandescent body 92 and the nozzle body 10 during operation.
- a tongue 102 extending from the inner ring edge 99 projects into each recess 101 and, after the incandescent body 92 has been inserted, is placed around its end turn 94, as the arrow B in FIG. 3 indicates.
- the tongue 102 is brought into the final shape 102b via the intermediate stage 102a, with or after which the edge of the collar 100 is pressed slightly outwards, where the end turn 94 holds it captively and without play.
- the end turn 93 of the incandescent body 22 on the combustion chamber side has an inside diameter which is larger than the outside diameter of the adjacent and all other turns.
- the sheet metal body 96 has a bottom 104 with ventilation openings 105 and a central push-through opening 106, the clear diameter of which is smaller than the outer diameter of the end turn 93 but larger than the diameter of all other turns of the glow body 22.
- the end turn 93 of the incandescent body 22 lies on an annular shoulder 107 surrounding the push-through opening 106 and, according to the invention, faces away from the nozzle body 10 and is also held in place by tongues 108 formed on the ring edge 104 which, after the incandescent body 92 is inserted, around its end turn 93 be bent around.
- the glow body 92 can also be inserted after the contact ring disk 98 has already been fastened to the sheet metal body 96 via the insulating body 44.
- the glow body 92 is connected to the contact ring disk 98 and the sheet metal body 96, e.g. held by laser welding, centered in a production-oriented manner by the tongues 102 and 108.
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 |
---|---|---|---|
DE19863615636 DE3615636A1 (de) | 1986-05-09 | 1986-05-09 | Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine |
DE3615636 | 1986-05-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0267199A1 true EP0267199A1 (de) | 1988-05-18 |
EP0267199B1 EP0267199B1 (de) | 1989-10-11 |
Family
ID=6300455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87900647A Expired EP0267199B1 (de) | 1986-05-09 | 1987-01-14 | Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US4821696A (de) |
EP (1) | EP0267199B1 (de) |
JP (1) | JPS63503316A (de) |
DE (2) | DE3615636A1 (de) |
WO (1) | WO1987006978A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3609749A1 (de) * | 1986-03-22 | 1987-09-24 | Bosch Gmbh Robert | Einrichtung zum einspritzen von kraftstoff in brennraeume von brennkraftmaschinen |
DE3615634A1 (de) * | 1986-05-09 | 1987-11-12 | Bosch Gmbh Robert | Einrichtung zum einspritzen von kraftstoff in einen brennraum einer brennkraftmaschine |
US5401935A (en) * | 1993-05-28 | 1995-03-28 | Heaters Engineering, Inc. | Fuel heating assembly |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1693966A (en) * | 1928-12-04 | sperry | ||
US1935171A (en) * | 1929-09-14 | 1933-11-14 | Packard Motor Car Co | Internal combustion engine |
US1927562A (en) * | 1930-01-31 | 1933-09-19 | Packard Motor Car Co | Glow plug |
DE1256942B (de) * | 1965-09-04 | 1967-12-21 | Cav Ltd | Vorrichtung zum Erleichtern des Anlassens von Brennkraftmaschinen |
US3648669A (en) * | 1970-05-28 | 1972-03-14 | William J Rank | Fuel injector and igniter |
GB1453835A (en) * | 1973-03-02 | 1976-10-27 | Cav Ltd | Starting aids |
DE3224048A1 (de) * | 1982-06-28 | 1983-12-29 | Robert Bosch Gmbh, 7000 Stuttgart | Gluehzuendvorrichtung fuer eine brennkraftmaschine |
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 |
DE3318459A1 (de) * | 1983-05-20 | 1984-11-22 | Robert Bosch Gmbh, 7000 Stuttgart | Einrichtung zum einspritzen von kraftstoff 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
- 1986-05-09 DE DE19863615636 patent/DE3615636A1/de not_active Withdrawn
-
1987
- 1987-01-14 DE DE8787900647T patent/DE3760753D1/de not_active Expired
- 1987-01-14 US US07/159,521 patent/US4821696A/en not_active Expired - Fee Related
- 1987-01-14 WO PCT/DE1987/000012 patent/WO1987006978A1/de active IP Right Grant
- 1987-01-14 JP JP62500577A patent/JPS63503316A/ja active Pending
- 1987-01-14 EP EP87900647A patent/EP0267199B1/de not_active Expired
Non-Patent Citations (1)
Title |
---|
See references of WO8706978A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1987006978A1 (en) | 1987-11-19 |
EP0267199B1 (de) | 1989-10-11 |
US4821696A (en) | 1989-04-18 |
DE3760753D1 (en) | 1989-11-16 |
DE3615636A1 (de) | 1987-11-12 |
JPS63503316A (ja) | 1988-12-02 |
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