EP1373710A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1373710A1 EP1373710A1 EP02727267A EP02727267A EP1373710A1 EP 1373710 A1 EP1373710 A1 EP 1373710A1 EP 02727267 A EP02727267 A EP 02727267A EP 02727267 A EP02727267 A EP 02727267A EP 1373710 A1 EP1373710 A1 EP 1373710A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bore
- needle
- combustion chamber
- nozzle needle
- inner needle
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
Definitions
- the invention is based on a fuel injection valve for internal combustion engines, as is known, for example, from the published patent application DE 43 03 813 AI.
- a fuel injection valve has a valve body in which a bore is formed, on the combustion chamber end of which a valve seat surface and at least one injection opening are formed.
- a piston-shaped nozzle needle is arranged in the bore in a longitudinally displaceable manner and is sealingly guided in the bore in a section facing away from the combustion chamber.
- the nozzle needle tapers towards the combustion chamber to form a pressure shoulder and, at its end on the combustion chamber side, merges into a valve sealing surface which interacts with the valve seat surface and thus opens and closes the at least one injection opening by longitudinal movement of the nozzle needle.
- a radial expansion of the bore forms a pressure chamber which, surrounding the nozzle needle, continues as an annular channel up to the valve seat surface.
- the nozzle needle is acted upon by a closing force which acts in the direction of the valve seat.
- a hydraulic force acts on the nozzle needle against this closing force, which is exerted on the pressure shoulder by the fuel pressure in the pressure chamber and the hydraulic force associated therewith.
- a plurality of injection openings are generally arranged distributed uniformly over the circumference of the valve body.
- the nozzle needle and thus also the substantially conical valve sealing surface remain exactly centered on the bore and thus the valve sealing surface during the opening stroke movement of the nozzle needle, so that a uniform fuel flow from the pressure chamber to the injection openings takes place can. Since the nozzle needle is now guided in the bore on the section facing away from the combustion chamber, after the valve sealing surface has been lifted from the valve seat surface between the guided section and the valve sealing surface, there is a very long free length of the nozzle needle, so that it is easy for the nozzle needle to be decoupled the bore can come and thus correspondingly to an uneven inflow of fuel to the injection openings. At the beginning of the opening stroke movement with only a very small gap between the valve sealing surface and the valve seat surface, such a roofing has a great influence on the injection pattern and thus on the quality of the combustion.
- the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that the nozzle needle is guided by an inner needle, so that an exact centering in the bore is ensured over the entire stroke range of the nozzle needle.
- the nozzle needle has a central longitudinal bore in which the inner needle is arranged, which is fixed with respect to the valve body.
- the nozzle section, in particular in its end section facing the valve seat, is guided on the inner needle, so that no dislodging of the nozzle needle can result in the region of the valve seat.
- the inner needle has at least two radially outwardly projecting fixing webs which bear against the inner wall of the bore and thus caulk the inner needle in the bore. This ensures simple assembly of the inner needle without having to carry out structural changes or preparations for receiving the inner needle on the valve body. It can also be provided that more than two fixing webs are formed, which are then preferably distributed uniformly over the circumference of the inner needle.
- the inner needle has an undercut in its central region, so that the nozzle needle is guided on the inner needle only in an end section facing the combustion chamber and an end section facing away from the combustion chamber. This results in less friction losses between the inner needle and the outer needle and the risk of the outer needle seizing on the inner needle is reduced.
- FIG. 1 shows a longitudinal section through a fuel injection valve
- FIG. 2 shows an enlargement of FIG. 1 in the area of the valve body
- Figure 3 shows a cross section through Figure 2 along the line III-III and
- Figure 4 is an enlargement of Figure 1 in the region of the valve body of a further embodiment. Description of the embodiments
- a valve holding body 1 is clamped against a valve body 3 in the axial direction by means of a clamping nut 4.
- a bore 7 is formed in the valve body 3, at the end of the combustion chamber on which a valve seat surface 10 is formed, which is essentially conical and in which at least one injection opening 9 is arranged.
- a nozzle needle 12 is arranged, which is piston-shaped and which has a substantially frustoconical valve sealing surface 17 at its combustion chamber end, which cooperates with the valve seat surface 10, so that when the valve sealing surface 17 rests on the valve seat surface 10, the injection openings 9 are closed.
- the nozzle needle 12 is sealingly guided in a section facing away from the combustion chamber in the bore 7, the section of the nozzle needle 12 guided in a sealing manner having a larger diameter than the section of the nozzle needle 12 facing the combustion chamber, so that a pressure shoulder 22 is formed at the transition.
- a radial expansion of the bore 7 forms a pressure space 16 at the level of the pressure shoulder 22, which extends to the combustion chamber as an annular channel surrounding the nozzle needle 12 as far as the valve seat surface 10.
- the pressure chamber 16 is connected via an inlet channel 30 running in the valve body 3 and in the valve holding body 1 to a high-pressure connection 49, via which fuel can be conveyed into the pressure chamber from a high-pressure fuel source, not shown in the drawing.
- FIG. 2 shows an enlarged illustration of FIG. 1 in the area of the valve body 3 and FIG. 3 shows a cross section of FIG. 2 along the line III-III.
- the nozzle needle 12 has a central longitudinal bore 19, which serves here as a guide bore and in which an inner needle 14 is arranged.
- the inner needle 14 has at its end facing the combustion chamber a contact surface 11 which is conical and bears against the likewise conical valve seat surface 10. Due to the conical shape of both surfaces, the contact surface 11 is fixed centrally so that the side of the inner needle 14 facing the combustion chamber is exactly aligned in the direction of the longitudinal axis 6 of the bore 7.
- the inner needle 14 has three fixing webs 20 which extend in the radial direction from the inner needle 14 to the outside, where they are caulked in the bore 7 in a force-locking manner.
- the three fixing webs 20 are arranged evenly distributed over the circumference of the inner needle 14, so that the inner needle 14 is fixed in place in the valve body 3 by the fixing webs 20 exactly in the direction of the longitudinal axis 6 of the bore 7. Provision can also be made for more or fewer than three fixing webs 20 to be formed on the nozzle needle 12, which are then likewise preferably distributed uniformly over the circumference of the inner needle 14.
- the nozzle needle 12 has corresponding recesses 15 which receive the fixing webs 20 and thus ensure the longitudinal displacement of the nozzle needle 12 on the inner needle 14.
- a gap 36 remains between the side of the fixing web 20 facing the combustion chamber and the recess 15, which, even in the open position of the nozzle needle 12, ensures that the nozzle needle 12 does not come into contact with the fixing webs 20 of the inner needle 14, so that the inner needle 14 does not pass through the constant striking of the nozzle needle 12 is misaligned from its centrally fixed position.
- the nozzle needle 12 abuts at its end remote from the combustion chamber against a cylindrical pressure piece 37 which is arranged in a spring chamber 32 formed in the valve holding body 1. Between the end of the spring chamber 32 facing away from the combustion chamber and the pressure piece 37, a closing spring 34 is arranged under pressure prestress, which is applied via the pressure piece 37 the nozzle needle 12 acts and thus presses the nozzle needle 12 in the closed position - this is when the valve sealing surface 17 bears against the valve seat surface 10.
- a piston bore 38 which opens into the spring chamber 32, is formed coaxially to the bore 7 in the valve holding body 1.
- a pressure piston 39 is arranged so as to be longitudinally displaceable, which projects at its end facing the combustion chamber into the spring chamber 32 and rests there against the pressure piece 37 and delimits a control chamber 40 with its end surface 41 facing away from the combustion chamber.
- the opening stroke of the nozzle needle 12 is stopped by the stop of the pressure piston 39 at the end of the piston bore 38 facing away from the combustion chamber.
- the control chamber 40 is connected via an inlet throttle 42 to the inlet channel 30 and via an outlet throttle 43 to a leakage oil space 48 formed in the valve holding body 1.
- This leakage oil space 48 is connected to a leakage oil system (not shown in the drawing) and is therefore continuously depressurized.
- a magnet armature 45 is arranged in the leak oil chamber 48, on the end of which facing the control chamber 40 a sealing ball 47 is arranged.
- the magnet armature 45 is acted upon by a spring 53 in the direction of the control chamber 40, so that the sealing ball 47 is pressed onto the outlet throttle 43 and closes the outlet throttle 43.
- a spring 53 surrounding the electromagnet 51 is arranged, which exerts an attractive force on the magnet armature 45 when the current is supplied with it, so that it is pulled against the force of the spring 53 in the direction of the electromagnet 51, so that the sealing ball 47 is the discharge throttle 43 releases. If the electromagnet 51 is not energized, the spring 53 presses the magnet armature 45 and thus the sealing ball 47 back onto the outlet throttle 43 and thus closes the control chamber 40 against the leak oil chamber 48.
- the operation of the fuel injection valve is as follows: Via the high-pressure connection 49, fuel is constantly conducted under high pressure into the pressure chamber 16, so that there is a constant predetermined high fuel pressure in the pressure chamber 16. This results in a hydraulic force on the pressure shoulder 22 of the nozzle needle 12, which is directed in the opening direction of the nozzle needle 12. If no injection is to take place, the electromagnet 51 is not energized and the outlet throttle 43 is thus closed by the sealing ball 47. As a result, the same pressure prevails in the control chamber 40 due to the inlet throttle 42 as in the inlet duct 30 or in the pressure chamber 16, so that a corresponding hydraulic force is exerted on the end face 41 of the pressure piston 39 facing away from the combustion chamber.
- the pressure piston 39 Since the pressure piston 39 has a larger diameter, and thus a larger hydraulically effective area than the nozzle needle 12, the force exerted by the pressure piston 39 via the pressure piece 37 on the nozzle needle 12 prevails, so that the nozzle needle 12 remains in the closed position and closes the injection openings 9 , If an injection is to take place, the electromagnet 51 is energized and the magnet armature 45 moves in the direction of the electromagnet 51. As a result, the sealing ball 47 releases the discharge throttle 43 and the control chamber 40 is connected to the leakage chamber 48. As a result, the pressure in the control chamber 40 drops, so that now the hydraulic force on the pressure shoulder 22 of the nozzle needle 12 predominates and the nozzle needle lifts off the valve seat surface 10 and opens the injection openings 9.
- the closing spring 34 only plays a subordinate role here and serves mainly to keep the nozzle needle 12 in the closed position when the fuel injection system is switched off. If the injection is to be ended, the electromagnet 51 is de-energized and the high fuel pressure of the inlet channel 30 builds up again in the control chamber 40.
- the inner needle 14 is inserted into the nozzle needle 12 and then both are inserted together into the bore 7.
- the annular webs 20 of the inner needle 14 are designed such that they must be pressed into the bore 7, so that the inner needle 14 is fixed in position in the bore 7 along its longitudinal axis 6.
- the nozzle needle 12 does not need to be further fixed, since it is clearly arranged in the bore 7 by the fixing of the inner needle 14.
- the valve holding body 1 with the pressure piston 39 already arranged therein, the closing spring 34 and the pressure piece 37 is clamped against the valve body 3 by means of the clamping nut 4.
- FIG. 1 A further exemplary embodiment of the fuel injection valve according to the invention is shown in FIG.
- the inner needle 14 has no constant outer diameter, but has an undercut 25 between a first guide section 114 facing the combustion chamber and a second guide section 214 facing away from the combustion chamber, in the area of which the inner needle 14 is reduced in outer diameter.
- the nozzle needle 12 is guided only on the first guide section 114 and the second guide section 214, which reduces the risk of the nozzle needle 12 seizing on the inner needle 14, and both the wear and the friction of the nozzle needle 12 on the inner needle 14 are reduced , It can also be provided that the second guide section 214 is also omitted and the nozzle needle 12 is guided on the inner needle 14 only on the first guide section 114.
- the nozzle needle 12 is in any case sealingly guided on its outer lateral surface in the section of the bore 7 facing away from the combustion chamber, so that guiding the nozzle needle 12 in this area on the inner needle 14 for stabilization is not absolutely necessary, depending on the requirements of the fuel injection valve.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10115215 | 2001-03-28 | ||
DE10115215A DE10115215A1 (de) | 2001-03-28 | 2001-03-28 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
PCT/DE2002/001094 WO2002077442A1 (de) | 2001-03-28 | 2002-03-26 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1373710A1 true EP1373710A1 (de) | 2004-01-02 |
EP1373710B1 EP1373710B1 (de) | 2006-07-26 |
Family
ID=7679339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02727267A Expired - Lifetime EP1373710B1 (de) | 2001-03-28 | 2002-03-26 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (6)
Country | Link |
---|---|
US (1) | US6874704B2 (de) |
EP (1) | EP1373710B1 (de) |
JP (1) | JP2004526895A (de) |
CN (1) | CN1298991C (de) |
DE (2) | DE10115215A1 (de) |
WO (1) | WO2002077442A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10222196A1 (de) * | 2002-05-18 | 2003-11-27 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
JP4013912B2 (ja) * | 2004-03-29 | 2007-11-28 | トヨタ自動車株式会社 | 燃料噴射弁 |
US7900604B2 (en) * | 2005-06-16 | 2011-03-08 | Siemens Diesel Systems Technology | Dampening stop pin |
JP4552890B2 (ja) * | 2006-05-11 | 2010-09-29 | 株式会社デンソー | インジェクタ |
DE102006040645A1 (de) * | 2006-08-30 | 2008-03-13 | Robert Bosch Gmbh | Injektor für Brennkraftmaschinen |
DE102006047935A1 (de) | 2006-10-10 | 2008-04-17 | Robert Bosch Gmbh | Kraftstoffinjektor für eine Brennkraftmaschine |
DE102008061400A1 (de) * | 2008-12-10 | 2010-06-17 | Man Diesel Se | Kraftstoff-Einspritzventil für eine Brennkraftmaschine |
DE102009054441A1 (de) * | 2009-11-25 | 2011-06-30 | L'Orange GmbH, 70435 | Kraftstoff-Einspritzdüse für Brennkraftmaschinen |
DE102016209249A1 (de) * | 2016-05-27 | 2017-11-30 | Robert Bosch Gmbh | Gasventil zum Dosieren von gasförmigen Kraftstoffen |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2030445A1 (de) * | 1970-06-20 | 1972-01-27 | Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg | Einspritzdüse |
DE2710216A1 (de) * | 1977-03-09 | 1978-09-14 | Bosch Gmbh Robert | Kraftstoffeinspritzduese |
DE4303813C1 (de) | 1993-02-10 | 1994-06-30 | Bosch Gmbh Robert | Kraftstoffeinspritzdüse für Brennkraftmaschinen |
DE19744518A1 (de) * | 1997-10-09 | 1999-04-15 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
AU4627797A (en) | 1997-10-09 | 1999-05-03 | Renault | Method for producing a synchronising signal for controlling an internal combustion engine electronic injection system |
JPH11280588A (ja) * | 1998-03-31 | 1999-10-12 | Denso Corp | 燃料噴射ノズル |
JPH11294301A (ja) * | 1998-04-08 | 1999-10-26 | Denso Corp | 燃料噴射ノズル |
GB9914644D0 (en) * | 1999-06-24 | 1999-08-25 | Lucas Ind Plc | Fuel injector |
EP1380750B1 (de) * | 1999-06-25 | 2005-11-23 | Delphi Technologies, Inc. | Brennstoffeinspritzventil |
-
2001
- 2001-03-28 DE DE10115215A patent/DE10115215A1/de not_active Withdrawn
-
2002
- 2002-03-26 US US10/296,584 patent/US6874704B2/en not_active Expired - Fee Related
- 2002-03-26 CN CNB02800907XA patent/CN1298991C/zh not_active Expired - Fee Related
- 2002-03-26 WO PCT/DE2002/001094 patent/WO2002077442A1/de active IP Right Grant
- 2002-03-26 EP EP02727267A patent/EP1373710B1/de not_active Expired - Lifetime
- 2002-03-26 JP JP2002575464A patent/JP2004526895A/ja active Pending
- 2002-03-26 DE DE50207640T patent/DE50207640D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO02077442A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1460151A (zh) | 2003-12-03 |
DE10115215A1 (de) | 2002-10-10 |
CN1298991C (zh) | 2007-02-07 |
JP2004526895A (ja) | 2004-09-02 |
DE50207640D1 (de) | 2006-09-07 |
WO2002077442A1 (de) | 2002-10-03 |
EP1373710B1 (de) | 2006-07-26 |
US20030155441A1 (en) | 2003-08-21 |
US6874704B2 (en) | 2005-04-05 |
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