EP0099991A1 - Buse d'injection de carburant pour moteurs à combustion interne - Google Patents
Buse d'injection de carburant pour moteurs à combustion interne Download PDFInfo
- Publication number
- EP0099991A1 EP0099991A1 EP83106279A EP83106279A EP0099991A1 EP 0099991 A1 EP0099991 A1 EP 0099991A1 EP 83106279 A EP83106279 A EP 83106279A EP 83106279 A EP83106279 A EP 83106279A EP 0099991 A1 EP0099991 A1 EP 0099991A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- armature
- coil core
- coil
- injection nozzle
- nozzle according
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 4
- 230000006698 induction Effects 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 230000011664 signaling Effects 0.000 claims abstract description 3
- 230000001419 dependent effect Effects 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
Definitions
- the invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim.
- These injection nozzles are characterized in that only one induction coil is required for signaling and that relatively large percentage changes in the air gap or the pole faces delimiting the air gap can be achieved, so that only a relatively small amount of effort is required for signal amplification in the measuring circuit .
- the coil core cannot be adjusted in the axial direction, so that the initial air gap between the armature and the coil core when the valve is closed or the initial size of the pole faces on these parts are influenced by a relatively large number of dimensional tolerances of the individual components. This means an increased manufacturing effort if the prescribed size of the initial air gap or the pole faces is to be adhered to as precisely as possible.
- the arrangement according to the invention with the characterizing features of the main claim has the advantage that the size of the initial air gap or the pole faces can be set exactly to the desired value regardless of the dimensional tolerances of the individual components, so that the tolerances can be refined and / or the storage of different lengths of coil cores or anchors.
- the initial air gap or the initial size of the pole faces can be determined, for example, by electronic measurement of the initial inductance of the induction coil or mechanically by the distance between the relevant surfaces on the armature and on the coil core relative to a reference plane, for example the separation plane between the nozzle holder, before the injection nozzle is assembled and washer or nozzle body, determined, then an adjusting element determining the position of the coil core is correspondingly readjusted and the coil core is then fixed in the set position.
- the nozzle holder for receiving the adjusting member is provided with a bore which opens at an acute angle into the bore receiving the coil core or the bobbin.
- the coil core be displaceably guided in an extension of the coil body and provided on the side facing away from the armature with a pin which fits into a narrowed bore section in the nozzle holder.
- the armature influenced by the valve needle or a rod part connecting the armature to the valve needle can be made particularly short if the coil core passes axially through the induction coil and is displaceably guided therein.
- the arrangement can also be such that both the coil core and the armature are immersed in the induction coil and the magnetic air gap is arranged between these parts within the induction coil.
- a sudden change in the magnetic resistance in the air gap can be achieved if the coil core or the armature has a blind hole facing the armature or the coil core, into which the armature or the coil core at the latest at the end of the opening stroke of the valve needle with a small residual air gap immersed radial play.
- the armature or the coil core can already be immersed in the blind hole or can be a little further away from the mouth of the blind hole.
- the part immersed in the blind bore can also be of conical design, so that with increasing valve needle lift both the air gap is reduced and the pole faces delimiting the air gap on the armature and coil core are enlarged.
- the pole faces on the armature and on the coil core can be conical.
- the blind bore be preceded by a bore leading the armature in a body made of non-magnetic material.
- the holes for receiving the induction coil and the coil core in the nozzle holder can be sealed against leakage oil leakage in a simple manner by the Coil body and / or the coil core on the outer circumference carries a sealing ring.
- FIG. 1 shows the first exemplary embodiment partly in longitudinal section and partly in side view
- FIG. 2 shows a partial longitudinal section through the second exemplary embodiment that is enlarged compared to FIG.
- the injection nozzle according to FIG. 1 has a nozzle holder 10, against which an intermediate plate 11 and a nozzle body 12 are clamped by a union nut 13.
- a valve needle 14 is displaceably mounted in the nozzle body 12, on which a closing spring 16 acts via a pressure piece 15 and is accommodated in a spring chamber 17 of the nozzle holder 10.
- the valve needle 14 cooperates with an inward-facing valve seat in the nozzle body 12 and executes its opening stroke against the direction of flow of the fuel.
- the guide bore of the valve needle 14 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 14 has a pressure shoulder which faces the valve seat and which has channels 18, 19, 20 and 21 in the intermediate disk 11 or the nozzle holder 10 with a Fuel connector 22 of the nozzle holder 10 is connected.
- the fuel pressure acting on the pressure shoulder of the valve needle 14 pushes the valve needle 14 upward against the force of the closing spring 16 until an invisible shoulder on the valve needle 14 against the lower end face of the Intermediate disc 11 abuts and limits the further upward stroke of the valve needle 14.
- the closing spring 16 is supported by a washer 24 on a flange part 25 made of magnetically conductive material, which abuts a shoulder 26 of the nozzle housing 10, which is formed at the transition from the spring chamber 17 to a multi-step blind bore 28.
- An induction coil designated as a whole by the reference number 30, is inserted into the latter, the winding 31 of which is applied to a coil former 32.
- Flange part 25 and coil body 32 are firmly connected to one another by means of a suitable method (glued, overmoulded).
- an anchor bolt 34 made of magnetically conductive material is slidably guided, which is firmly connected to the pressure piece 15 via an extension 35 and thereby moves with the valve needle 14 in both directions.
- the extension 35 is advantageously designed as a plastic part which is firmly connected to the anchor bolt 34 and the pressure piece 15 by a suitable method. This design of the extension 35 ensures that the anchor bolt 34 can move without jamming in the flange part 25 and the coil body 32.
- the coil former 32 is provided on the end face remote from the flange part 25 with a hub-shaped extension 38, in which a coil core 40, which cooperates with the anchor bolt 34 and is made of magnetically conductive material, is slidably mounted.
- This has a blind bore 41 in its front end facing the anchor bolt 34, the diameter of which is larger than the diameter of the anchor bolt 34 by twice the residual air gap between the anchor bolt 34 and the coil former 40.
- the coil core 40 is provided with a pin 42 which, with a metallic contact, fits into the stepped inner section 43 of the blind bore 28.
- the pin 42 lies with its end face against the front end of a stud 44 which is screwed into a threaded bore 45 which extends at an acute angle a to the longitudinal axis of the injection nozzle.
- a lateral recess 48 is provided in the nozzle holder 10, which cuts the bore 28 in the region of its central section 49 receiving the attachment 38.
- Means 50 are provided in the recess 48 for sealingly leading out the winding ends of the induction coil 30 and connecting them to a further cable 51, via which an evaluation circuit can be connected to the injection nozzle.
- a sealing ring 52 is also provided on the circumference of the coil former 32 and a sealing ring 53 on the circumference of the coil core 40.
- a longitudinal bore 54 and a transverse bore 55 are provided in the anchor bolt 34 to relieve the pressure in the blind bore 41 against the spring chamber 17.
- the magnetic field of the induction coil 30 leads via the armature bolt 34, the flange part 25, the inner region of the nozzle holder 10, the coil core 40 and the air gap which is formed between the coil core 40 and the armature bolt 34.
- the arrangement is such that even when the valve is closed, the anchor bolt 34 dips a very small amount into the blind bore 41.
- the smallest air gap between the armature bolt 34 and the coil core 40, which results from the radial play between these parts, is already present in the starting position.
- the signal-generating change in the magnetic field resistance is caused by the fact that, during the opening stroke of the valve needle 14, the anchor bolt 34 dips deeper into the blind bore 41, thereby increasing the pole faces of the parts which delimit the air gap.
- the initial size of the pole faces when the valve is closed can be set to any desired value by means of the stud screw 44.
- the value set in each case can be determined, for example, by detecting the inductance of the coil by means of an electronic circuit. However, adjustment by purely mechanical measurement is also possible.
- the coil core 40 is fixed at the point 58 in the nozzle holder 10 by caulking by means of a tool inserted into the recess 48.
- the arrangement according to the invention is not restricted to the construction shown and described.
- the air gap could, for example, also be formed between plane pole faces oriented perpendicular to the longitudinal axis of the injection nozzle, the signal being generated solely by changing the length of the air gap.
- An arrangement is particularly advantageous in which, when the valve needle 14 is in the closed position, the anchor bolt 34 is not yet immersed in the blind bore 41, because particularly large changes in the magnetic resistance can be achieved via the valve needle stroke.
- the adjustability of the coil core according to the invention is also not limited to the fact that the coil core on the side of the winding facing away from the valve needle 14 Induction coil is arranged and the anchor bolt passes through the coil body.
- the arrangement is such that a coil core 60 is passed through the winding 61 of an induction coil, designated as a whole by the reference number 62, and has a thickened end face 63 protruding from the winding 61, in which the end cooperating with the armature bolt 34 Blind bore 41 is arranged.
- the anchor bolt 34 is here much shorter than in the embodiment according to FIG. 1 and, moreover, is shaped conically tapering at its free end, so that both air gap reductions and an increase in the pole area result in the valve needle lifts.
- a flange part 65 consisting of magnetically conductive material is also provided here, which lies against the end face 63 of the coil core 60 via a magnetically insulating molded part 66 and, for example, is connected by adhesive.
- the molded part 66 is also used to guide the anchor bolt 34.
- a sealing ring 67 is stretched between the nozzle holder and the front end 63 of the coil core 60.
- the coil core 60 is fixed in the nozzle holder by caulking.
- the blind bore 41 could also be formed in the armature bolt 34 instead of in the coil core 60, which would be provided with a thickened head part for this purpose.
- both the coil core and the anchor bolt are immersed in the induction coil, the magnetic air gap being formed within the induction coil.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3227989 | 1982-07-27 | ||
| DE19823227989 DE3227989A1 (de) | 1982-07-27 | 1982-07-27 | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0099991A1 true EP0099991A1 (fr) | 1984-02-08 |
| EP0099991B1 EP0099991B1 (fr) | 1987-03-04 |
Family
ID=6169430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83106279A Expired EP0099991B1 (fr) | 1982-07-27 | 1983-06-28 | Buse d'injection de carburant pour moteurs à combustion interne |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4502326A (fr) |
| EP (1) | EP0099991B1 (fr) |
| JP (1) | JPS5934476A (fr) |
| DE (2) | DE3227989A1 (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0314666A3 (fr) * | 1987-10-26 | 1990-02-28 | Automotive Diesel Gesellschaft m.b.H. | Injecteur de combustible pour moteurs à combustion interne |
| WO1990006439A1 (fr) * | 1988-11-30 | 1990-06-14 | Robert Bosch Gmbh | Injecteur pour moteurs a combustion interne |
| US5271270A (en) * | 1991-03-15 | 1993-12-21 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines |
| EP0656475A1 (fr) * | 1993-12-02 | 1995-06-07 | Robert Bosch Gmbh | Injecteur de combustible avec détecteur de position de l'aiguille |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3343269C1 (de) * | 1983-11-30 | 1985-04-04 | Daimler-Benz Ag, 7000 Stuttgart | Vorrichtung zum indirekten beruehrungslosen elektrischen Messen kleiner Wege |
| US4573349A (en) * | 1984-06-28 | 1986-03-04 | International Harvester Company | Needle position indicator for a fuel injection nozzle holder |
| DE3515264A1 (de) * | 1985-04-27 | 1986-11-27 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
| GB8516127D0 (en) * | 1985-06-26 | 1985-07-31 | Lucas Ind Plc | Fuel injection nozzle |
| DE3864772D1 (de) * | 1987-07-21 | 1991-10-17 | Nippon Denso Co | Verfahren zum einstellen der brennstoffeinspritzmenge eines elektromagnetischen brennstoffeinspritzventils. |
| US5895844A (en) * | 1997-05-29 | 1999-04-20 | Outboard Marine Corporation | Precise fuel flow measurement with modified fluid control valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB729431A (en) * | 1951-09-25 | 1955-05-04 | Leslie Hartridge | Apparatus and devices for testing fuel injection pumps and nozzles for internal combustion compression ignition engines |
| GB754917A (en) * | 1953-11-04 | 1956-08-15 | Daimler Benz Ag | Apparatus for measuring the movement of valve needles, particularly for fuel injection nozzles of internal combustion engines |
| FR2320557A1 (fr) * | 1975-08-02 | 1977-03-04 | Lucas Industries Ltd | Perfectionnements aux transducteurs detectant le moment ou se produit un mouvement relatif entre deux organes |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2365592A (en) * | 1940-05-30 | 1944-12-19 | Kapella Ltd | Electrical measuring apparatus |
| DE2120465C3 (de) * | 1971-04-27 | 1973-10-11 | Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg | Brennstoffeinspritzventil |
| DE3004424A1 (de) * | 1980-02-07 | 1981-08-13 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoff-einspritzduesenhalter |
-
1982
- 1982-07-27 DE DE19823227989 patent/DE3227989A1/de not_active Withdrawn
-
1983
- 1983-04-11 US US06/483,994 patent/US4502326A/en not_active Expired - Lifetime
- 1983-06-28 DE DE8383106279T patent/DE3370055D1/de not_active Expired
- 1983-06-28 EP EP83106279A patent/EP0099991B1/fr not_active Expired
- 1983-07-21 JP JP58132022A patent/JPS5934476A/ja active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB729431A (en) * | 1951-09-25 | 1955-05-04 | Leslie Hartridge | Apparatus and devices for testing fuel injection pumps and nozzles for internal combustion compression ignition engines |
| GB754917A (en) * | 1953-11-04 | 1956-08-15 | Daimler Benz Ag | Apparatus for measuring the movement of valve needles, particularly for fuel injection nozzles of internal combustion engines |
| FR2320557A1 (fr) * | 1975-08-02 | 1977-03-04 | Lucas Industries Ltd | Perfectionnements aux transducteurs detectant le moment ou se produit un mouvement relatif entre deux organes |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0314666A3 (fr) * | 1987-10-26 | 1990-02-28 | Automotive Diesel Gesellschaft m.b.H. | Injecteur de combustible pour moteurs à combustion interne |
| WO1990006439A1 (fr) * | 1988-11-30 | 1990-06-14 | Robert Bosch Gmbh | Injecteur pour moteurs a combustion interne |
| US5271270A (en) * | 1991-03-15 | 1993-12-21 | Robert Bosch Gmbh | Fuel injection nozzle for internal combustion engines |
| DE4108416C2 (de) * | 1991-03-15 | 2000-05-18 | Bosch Gmbh Robert | Kraftstoff-Einspritzdüse für Brennkraftmaschinen |
| EP0656475A1 (fr) * | 1993-12-02 | 1995-06-07 | Robert Bosch Gmbh | Injecteur de combustible avec détecteur de position de l'aiguille |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3227989A1 (de) | 1984-02-02 |
| JPH0425433B2 (fr) | 1992-04-30 |
| EP0099991B1 (fr) | 1987-03-04 |
| DE3370055D1 (en) | 1987-04-09 |
| JPS5934476A (ja) | 1984-02-24 |
| US4502326A (en) | 1985-03-05 |
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