EP2106500B1 - Injecteur de carburant - Google Patents
Injecteur de carburant Download PDFInfo
- Publication number
- EP2106500B1 EP2106500B1 EP07821687A EP07821687A EP2106500B1 EP 2106500 B1 EP2106500 B1 EP 2106500B1 EP 07821687 A EP07821687 A EP 07821687A EP 07821687 A EP07821687 A EP 07821687A EP 2106500 B1 EP2106500 B1 EP 2106500B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- combustion chamber
- nozzle needle
- chamber
- fuel injector
- 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.)
- Not-in-force
Links
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
- 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
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/161—Means for adjusting injection-valve lift
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
Definitions
- the invention relates to a fuel injector according to the preamble of claim 1.
- the object of the invention is to provide a fuel injector according to the preamble of claim 1, which is inexpensive to produce.
- the injector according to the invention can be operated with a pulling and a pushing working phase.
- This provides the advantage that the size of an actuator used for actuating the injector, in particular a piezoelectric actuator, in comparison to conventional injectors can be reduced.
- Due to the additional low pressure surface which is preferably arranged on the nozzle needle top and directed against the closing direction, the opening force required to open the nozzle needle is reduced.
- a closing force is required in the open state of the nozzle needle to close the nozzle needle.
- the large opening force occurring in conventional injectors is divided between the opening and closing phases of the nozzle needle.
- the nozzle needle may be formed one or more parts.
- the nozzle needle may further be operatively connected to an additional element.
- the further element can be mechanically or hydraulically coupled to the nozzle needle.
- the combustion chamber distal end of the nozzle needle preferably has the shape of a straight circular cylinder on which the shoulder is formed.
- the paragraph, viewed in cross section, has the shape of a step.
- the two guide sections form a double guide for the nozzle needle.
- the nozzle needle has between its combustion chamber near the end and the double guide to another guide section through which the nozzle needle is guided in the injector.
- a preferred embodiment of the fuel injector is characterized in that the low-pressure surface is smaller than a provided at the combustion chamber near the end of the nozzle needle combustion chamber pressure surface.
- the combustion chamber pressure surface is replaced by a Defined at the combustion chamber near the end of the nozzle needle provided sealing seat.
- the combustion chamber facing and limited by the sealing seat pressure surface on the nozzle needle is referred to as the combustion chamber pressure surface.
- Another preferred exemplary embodiment of the fuel injector is characterized in that the low-pressure surface is approximately half the size of the combustion chamber pressure surface.
- Another preferred embodiment of the fuel injector is characterized in that the combustion chamber remote end of the nozzle needle is guided with the two guide portions in a double guide body which is complementary to the guide portions.
- the double guide body is fixed, preferably in one piece, to a part of the injector housing, for example an intermediate plate.
- a further preferred embodiment of the fuel injector is characterized in that the double guide body has a shoulder, in the region of which a low-pressure channel opens.
- the low pressure passage communicates with a low pressure source such as a fuel tank.
- a low pressure source such as a fuel tank.
- About the low pressure channel is the low pressure area with low pressure, for example, ambient pressure, applied.
- a further preferred embodiment of the fuel injector is characterized in that the double guide body is sleeve-shaped and arranged in a high-pressure chamber.
- a further preferred embodiment of the fuel injector is characterized in that the coupling space is limited in the radial direction by the double guide body and in the axial direction to the combustion chamber through the nozzle needle.
- the coupling space is bounded away from the combustion chamber in the axial direction by a coupler piston, which is connected to an actuator, in particular a piezoelectric actuator.
- a further preferred embodiment of the fuel injector is characterized in that the coupling space is subdivided into partial coupling spaces, which communicate with each other via a throttle.
- the vibration behavior of the injector can be optimized.
- the needle opening speed can be adjusted by the throttle.
- FIG. 1 a fuel injector with an injector 1 is shown in longitudinal section.
- the injector housing 1 comprises a nozzle body 2, which projects with its lower free end into a combustion chamber of an internal combustion engine to be supplied with fuel. With its upper end remote from the combustion chamber, the nozzle body 2 is clamped axially against an intermediate body 3 and an injector body 4 by means of a clamping nut (not shown).
- the injector body 4 has substantially the shape of a circular cylinder jacket-shaped sleeve, whose one end face is closed by the intermediate body 3 and the other end face by an injector head 5.
- an axial guide bore 6 is recessed, in which a nozzle needle 8 is guided axially displaceable.
- a sealing edge 10 is formed, which cooperates with a sealing seat or a sealing surface 11 to two injection holes 13 and 14 in dependence on the position of the nozzle needle 8 specifically release or close.
- the nozzle needle 8 has a pressure chamber section 15, followed by a truncated conical widening section 16, which is also referred to as a pressure shoulder.
- the pressure shoulder is arranged in a pressure chamber 17 which is formed between the nozzle needle 8 and the nozzle body 2.
- On the pressure shoulder 16 is followed by a guide portion 18 which is guided in the guide bore 6 movable back and forth.
- a fluid connection between the pressure chamber 17 and a nozzle spring chamber 22 is provided.
- the nozzle spring chamber 22 is connected via a connecting channel 24, which is formed in the intermediate body 3, with an actuator chamber 25 in connection, which in turn is connected via an inlet channel or a supply line 26 with a high-pressure fuel source 28 in conjunction, which is also referred to as common rail.
- the fuel injector is actuated by a piezoactuator 30 having a coupler piston 32 whose end face close to the combustion chamber limits a partial coupling space 34 in the axial direction. In the radial direction of the sub-coupling space 30 is limited by a sealing sleeve 35 which is guided on the coupler piston 32 and biased by a compression spring 36 which bears against a collar 37 of the coupler piston 32 supported.
- the partial coupling space 34 communicates via a connecting channel 38, which is equipped with a throttle 39, with another partial coupling space 40 in connection.
- the guide portion 18 of the nozzle needle 8 is bounded away from the combustion chamber by a collar 44, from which the combustion chamber remote end 45 of the nozzle needle 8 goes out.
- the combustion chamber remote end 45 of the nozzle needle 8 has a first guide portion 46 and a second guide portion 47.
- the first guide portion 46 has a smaller outer diameter than the second guide portion 47, which extends from the collar 44.
- the two guide portions 46 and 47 are interconnected by a shoulder 50 having the low pressure surface, which is therefore also designated 50.
- the combustion chamber remote end 45 of the nozzle needle 8 is guided with its guide portions 46 and 47 in a double guide body 55 which is fixedly connected to the intermediate body 3, which is also referred to as an intermediate plate.
- a pressure connection channel 52 is recessed, which opens in the region of the shoulder 50 in an annular space which is formed between the combustion chamber distal end 45 and the double guide body 55.
- An arrow 53 indicates that the low-pressure connection channel 52 communicates with a low-pressure source, for example a fuel tank.
- the double guide body 55 has the shape of a sleeve extending from the intermediate body 3 to the combustion chamber extends. Between the combustion chamber near end face of the double guide body 55 and the collar 44, a nozzle spring 60 is clamped.
- the nozzle needle 8 is guided through the guide section 18 in the shaft in the nozzle body 2 and through the guide sections 46 and 47 at the combustion chamber distal end 45 in the double guide body 55.
- the design of the low pressure surface 50 depends on the needle seat at the tip 9 of the nozzle needle 8 and is a proportion of a combustion chamber pressure surface 62 below the needle seat.
- the idle state of the fuel injector prevails in the partial coupling spaces 34 and 40 high pressure, which is also referred to as rail pressure.
- the high pressure acts on the combustion chamber remote end face of the nozzle needle 8. This end face is also referred to as the control pressure surface 61.
- the pressurized at its control pressure surface 61 high pressure nozzle needle 8 is closed.
- the piezoelectric actuator 30 is charged in the idle state of the fuel injector and has its maximum longitudinal extent. To actuate the fuel injector, the piezoelectric actuator 30 is discharged and retracts.
- the pressure in the sub-coupling spaces 34 and 40 drops and the nozzle needle opens, that is, lifts off from its nozzle needle seat.
- a needle stop is provided for limiting the stroke.
- the reduced switching force necessary for needle opening preferably halved.
- the piezoelectric actuator 30 in comparison with conventional actuators, only has to have approximately half the cross-sectional area in order to apply the force required for needle opening.
- a higher, for example double, path ratio and a shorter actuator can be used.
- the nozzle needle 8 is not pressure-balanced in the open state, but is acted upon by a force acting in the opening direction. This force must be applied by the piezoelectric actuator 30 for needle closing.
- the piezoelectric actuator 30 can apply the same tensile and compressive force.
- the inventive design of the injector, the working capacity of the actuator can be optimally utilized.
- FIG. 2 In a Cartesian coordinate diagram, the force K is plotted against the stroke H.
- a circle 71 the idle state of the injector is referred to, in which the actuator has its maximum stroke.
- the second position or opening position of the injector is referred to, in which the actuator has its minimum stroke.
- a dashed quadrilateral 74 the working lines of the actuator 30 of in FIG. 1 illustrated fuel injector shown schematically.
- the normal operating range of conventional direct needle control fuel injectors is indicated by a triangle 75.
- a triangle 76 of the extended working range of the fuel injector according to the invention is indicated.
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)
Claims (8)
- Injecteur de carburant pourvu d'un carter d'injecteur (1) comportant un raccordement de haute pression de carburant relié à une source centrale de haute pression de carburant (28) placée à l'extérieur du carter d'injecteur (1) et à une chambre de pression (17) placée à l'intérieur du carter d'injecteur (1), hors duquel, en fonction de la pression régnant dans une chambre de couplage (40), du carburant chargé sous haute pression est injecté dans une chambre de combustion d'un moteur à combustion interne, lorsqu'un pointeau de buse (8) comportant une extrémité (45) éloignée par rapport à la chambre de combustion pourvue d'une surface de pression de commande (61) s'ouvre, ladite surface étant chargée en pression de chambre de couplage régnant dans la chambre de couplage (40), le pointeau de buse (8) ou un élément relié activement au pointeau de buse (8) comportant au moins une surface basse pression opposée à la chambre de combustion (50) alimentée en basse pression, le pointeau de buse (8) comportant au niveau de son extrémité (45) éloignée par rapport à la chambre de combustion un épaulement (50) formant la surface basse pression, l'épaulement (50) étant prévu entre une première section de guidage (46) s'étendant à partir de la chambre de combustion et une deuxième section de guidage (47) s'étendant en direction de la chambre de combustion, caractérisé en ce que la première section de guidage (46) présente un diamètre extérieur plus réduit que celui de la deuxième section de guidage (47).
- Injecteur de carburant selon la revendication 1, caractérisé en ce que la surface basse pression (50) est inférieure à une surface de pression (62) de la chambre de combustion prévue au niveau de l'extrémité, située à proximité de la chambre de combustion, du pointeau de buse.
- Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface basse pression (50) est approximativement moitié moins importante que la surface de pression (62) de la chambre de combustion.
- Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que l'extrémité (45) éloignée par rapport à la chambre de combustion du pointeau de buse (8) est guidée, avec les deux sections de guidage (46, 47), dans un double corps de guidage (55) réalisé de façon complémentaire par rapport aux sections de guidage (46, 47).
- Injecteur de carburant selon la revendication 4, caractérisé en ce que le double corps de guidage (55) comporte un épaulement dans la zone duquel débouche un canal basse pression (52).
- Injecteur de carburant selon la revendication 4 ou 5, caractérisé en ce que le double corps de guidage (55) prend une forme de douille et est disposé dans une chambre haute pression (22).
- Injecteur de carburant selon l'une quelconque des revendications 4 à 6, caractérisé en ce que la chambre de couplage est délimitée par le double corps de guidage (55) dans la direction radiale et par le pointeau de buse (8) dans la direction axiale en direction de la chambre de combustion.
- Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que la chambre de couplage est subdivisée en sous-chambres de couplage (34,40) reliées entre elles par le biais d'un étranglement (39).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006062216A DE102006062216A1 (de) | 2006-12-22 | 2006-12-22 | Kraftstoffinjektor |
PCT/EP2007/061323 WO2008077657A1 (fr) | 2006-12-22 | 2007-10-23 | Injecteur de carburant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2106500A1 EP2106500A1 (fr) | 2009-10-07 |
EP2106500B1 true EP2106500B1 (fr) | 2013-02-27 |
Family
ID=38871583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07821687A Not-in-force EP2106500B1 (fr) | 2006-12-22 | 2007-10-23 | Injecteur de carburant |
Country Status (6)
Country | Link |
---|---|
US (1) | US8226018B2 (fr) |
EP (1) | EP2106500B1 (fr) |
JP (1) | JP4971463B2 (fr) |
CN (1) | CN101568716B (fr) |
DE (1) | DE102006062216A1 (fr) |
WO (1) | WO2008077657A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008002153B4 (de) | 2008-06-02 | 2016-02-18 | Robert Bosch Gmbh | Kraftstoff-Injektor |
DE102008002419A1 (de) | 2008-06-13 | 2009-12-17 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102008002411A1 (de) | 2008-06-13 | 2009-12-17 | Robert Bosch Gmbh | Kraftstoffinjektor |
WO2011014607A1 (fr) | 2009-07-30 | 2011-02-03 | 3M Innovative Properties Company | Buse et procédé de fabrication |
ATE546636T1 (de) * | 2009-08-26 | 2012-03-15 | Delphi Tech Holding Sarl | Kraftstoffeinspritzdüse |
DE102013212269A1 (de) * | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE102013219225A1 (de) * | 2013-09-25 | 2015-03-26 | Continental Automotive Gmbh | Piezo-Injektor zur Kraftstoff-Direkteinspritzung |
US10077748B2 (en) | 2014-12-23 | 2018-09-18 | Cummins Inc. | Fuel injector for common rail |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2242344A1 (de) * | 1972-08-29 | 1974-03-14 | Bosch Gmbh Robert | Kraftstoffeinspritzduese fuer brennkraftmaschinen |
US4576338A (en) * | 1984-08-29 | 1986-03-18 | General Motors Corporation | Fuel injector with hoop nozzle spray tip |
US5779149A (en) * | 1996-07-02 | 1998-07-14 | Siemens Automotive Corporation | Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke |
US5860597A (en) * | 1997-03-24 | 1999-01-19 | Cummins Engine Company, Inc. | Injection rate shaping nozzle assembly for a fuel injector |
JPH1113576A (ja) * | 1997-06-27 | 1999-01-19 | Toyota Motor Corp | 燃料噴射弁 |
DE60014813T2 (de) * | 1999-08-31 | 2006-03-09 | Denso Corp., Kariya | Kraftstoffeinspritzvorrichtung |
WO2001053696A2 (fr) * | 2000-01-20 | 2001-07-26 | Robert Bosch Gmbh | Systeme d'injection et procede pour injecter un fluide |
JP3527214B2 (ja) | 2001-04-26 | 2004-05-17 | 株式会社日本自動車部品総合研究所 | 燃料噴射弁 |
US7100032B2 (en) | 2002-06-28 | 2006-08-29 | Intel Corporation | Method and apparatus for identifying hardware compatibility and enabling stable software images |
US6824081B2 (en) * | 2002-06-28 | 2004-11-30 | Cummins Inc. | Needle controlled fuel injector with two control valves |
DE10229413A1 (de) * | 2002-06-29 | 2004-01-29 | Robert Bosch Gmbh | Druckübersetzersteuerung durch Bewegung eines Einspritzventilgliedes |
WO2006028740A2 (fr) * | 2004-09-01 | 2006-03-16 | Igt | Systeme de jeux a dispositifs de jeu multiples partageant un affichage multi-sortie |
JP2006200478A (ja) | 2005-01-21 | 2006-08-03 | Denso Corp | 燃料噴射装置 |
JP2006242151A (ja) * | 2005-03-07 | 2006-09-14 | Denso Corp | 燃料噴射弁及び燃料噴射装置 |
-
2006
- 2006-12-22 DE DE102006062216A patent/DE102006062216A1/de not_active Withdrawn
-
2007
- 2007-10-23 JP JP2009541931A patent/JP4971463B2/ja not_active Expired - Fee Related
- 2007-10-23 WO PCT/EP2007/061323 patent/WO2008077657A1/fr active Application Filing
- 2007-10-23 EP EP07821687A patent/EP2106500B1/fr not_active Not-in-force
- 2007-10-23 CN CN2007800475992A patent/CN101568716B/zh not_active Expired - Fee Related
- 2007-10-23 US US12/520,279 patent/US8226018B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP2106500A1 (fr) | 2009-10-07 |
JP2010513781A (ja) | 2010-04-30 |
JP4971463B2 (ja) | 2012-07-11 |
WO2008077657A1 (fr) | 2008-07-03 |
US8226018B2 (en) | 2012-07-24 |
CN101568716A (zh) | 2009-10-28 |
US20090308956A1 (en) | 2009-12-17 |
DE102006062216A1 (de) | 2008-06-26 |
CN101568716B (zh) | 2012-05-30 |
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