EP2106500A1 - Injecteur de carburant - Google Patents

Injecteur de carburant

Info

Publication number
EP2106500A1
EP2106500A1 EP07821687A EP07821687A EP2106500A1 EP 2106500 A1 EP2106500 A1 EP 2106500A1 EP 07821687 A EP07821687 A EP 07821687A EP 07821687 A EP07821687 A EP 07821687A EP 2106500 A1 EP2106500 A1 EP 2106500A1
Authority
EP
European Patent Office
Prior art keywords
pressure
combustion chamber
nozzle needle
fuel injector
fuel
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
Application number
EP07821687A
Other languages
German (de)
English (en)
Other versions
EP2106500B1 (fr
Inventor
Hans-Christoph Magel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2106500A1 publication Critical patent/EP2106500A1/fr
Application granted granted Critical
Publication of EP2106500B1 publication Critical patent/EP2106500B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 object is with a fuel injector with an injector housing, which has a high-pressure fuel connection, which with a central High-pressure fuel source outside of the injector and is in communication with a pressure space within the injector, from which, depending on the pressure in a coupling space, high-pressure fuel is injected into a combustion chamber of an internal combustion engine when a nozzle needle opens, which is a brennraumfer- nes end having a control pressure surface which is acted upon in the coupling space with coupling space pressure, achieved in that the nozzle needle or an element operatively connected to the nozzle needle at least one low pressure surface facing away from the combustion chamber, which is acted upon by low pressure.
  • the injector according to the invention can be operated with a pulling and a pushing working phase.
  • 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. Depending on the ratio of the size of the control pressure surface and / or the Brennraumdurckflache to the size of the low pressure surface, a closing force is required in the open state of the nozzle needle to close the nozzle needle. According to the invention, the large opening force occurring in conventional injectors is divided between the opening and closing phases of the nozzle needle. Particularly advantageous is a distribution in the range 50 to 50.
  • 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.
  • a preferred exemplary embodiment of the fuel injector is characterized in that the low-pressure surface is smaller than a combustion chamber pressure surface provided at the combustion chamber near end of the nozzle needle.
  • the combustion chamber pressure surface is defined by a sealing seat provided at the end of the nozzle needle close to the combustion chamber.
  • the combustion chamber facing and limited by the sealing seat pressure surface on the nozzle needle is referred to as Brennraumdruck- flat.
  • 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.
  • nozzle needle has a shoulder at its end remote from the combustion chamber which forms the low-pressure surface.
  • the end of the nozzle needle remote from the combustion chamber preferably has the shape of a straight circular cylinder.
  • the paragraph viewed in cross section, has the shape of a step.
  • Another preferred embodiment of the fuel injector is characterized in that the shoulder is provided between a first guide portion extending away from the combustion chamber and a second guide portion extending toward the combustion chamber.
  • 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 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.
  • Figure 1 is a simplified representation of a fuel injector according to the invention in longitudinal section and
  • FIG. 1 shows a longitudinal section of a fuel injector with an injector housing 1.
  • 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, in communication with an actuator chamber 25, which in turn is connected via an inlet channel or an inlet line 26 to a high-pressure fuel source 28, which is also referred to as a common rail ,
  • the fuel injector is actuated by a piezoactuator 30 with a coupler piston 32 whose end face close to the combustion chamber limits a partial coupling space 34 in the axial direction.
  • a sealing sleeve 35 which is guided on the coupler piston 32 and biased by a compression spring 36 which bears on a collar 37 of the coupler piston 32 is 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 sections 46 and 47 are connected to one another by a shoulder 50, which has the low-pressure surface, which is therefore also designated by 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 which extends from the intermediate body 3 to the combustion chamber. room 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 spring 60 is, like the Doppel Operationsskör- per 55, arranged in the high-pressure chamber 22, which is therefore also referred to as a nozzle spring chamber.
  • 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 when the fuel injector is at rest and has its maximum longitudinal extent. To control the Kraftstoffinj ector of the piezoelectric actuator 30 is discharged and retracts it.
  • the pressure in the partial coupling chambers 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 only has to have approximately half the cross-sectional area in order to apply the force required to open the needle.
  • a higher, for example double, path ratio and a shorter actuator can be used.
  • the nozzle needle 8 is not pressure-balanced in the opened state, but 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.
  • the force K is plotted against the stroke H in a Cartesian coordinate diagram.
  • 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 the fuel injector shown in Figure 1 are 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)

Abstract

L'invention concerne un injecteur de carburant comprenant un boîtier d'injecteur (1), qui présente un raccord haute pression pour carburant, qui est relié à une source haute pression centrale de carburant (28) à l'extérieur du boîtier d'injecteur (1) et à un espace de pression (17) à l'intérieur du boîtier d'injecteur (1), injecteur depuis lequel, en fonction de la pression dans un espace de couplage, du carburant à haute pression est injecté dans une chambre de combustion d'un moteur à combustion interne, lorsqu'un pointeau (8) s'ouvre, présentant une extrémité (45) éloignée de la chambre de combustion avec une surface de pression de commande (61), qui est sollicitée par une pression d'espace de couplage dans l'espace de couplage. L'invention vise à créer un injecteur de carburant qui puisse être réalisé de manière économique. A cet effet, le pointeau (8) présente au moins une surface basse pression (50) opposée à la chambre de combustion, qui est soumise à basse pression.
EP07821687A 2006-12-22 2007-10-23 Injecteur de carburant Not-in-force EP2106500B1 (fr)

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 true EP2106500A1 (fr) 2009-10-07
EP2106500B1 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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002153B4 (de) 2008-06-02 2016-02-18 Robert Bosch Gmbh Kraftstoff-Injektor
DE102008002411A1 (de) 2008-06-13 2009-12-17 Robert Bosch Gmbh Kraftstoffinjektor
DE102008002419A1 (de) 2008-06-13 2009-12-17 Robert Bosch Gmbh Kraftstoffinjektor
PL2459867T3 (pl) 2009-07-30 2014-08-29 3M Innovative Properties Co Dysza i sposób jej wytwarzania
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)

* Cited by examiner, † Cited by third party
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
EP1081372B1 (fr) 1999-08-31 2004-10-13 Denso Corporation Dispositif d'injection de carburant
EP1252436B1 (fr) * 2000-01-20 2006-05-17 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
US6824081B2 (en) * 2002-06-28 2004-11-30 Cummins Inc. Needle controlled fuel injector with two control valves
US7100032B2 (en) 2002-06-28 2006-08-29 Intel Corporation Method and apparatus for identifying hardware compatibility and enabling stable software images
DE10229413A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Druckübersetzersteuerung durch Bewegung eines Einspritzventilgliedes
AU2005282887B2 (en) * 2004-09-01 2012-03-01 Igt Gaming system having multiple gaming devices that share a multi-outcome display
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008077657A1 *

Also Published As

Publication number Publication date
WO2008077657A1 (fr) 2008-07-03
EP2106500B1 (fr) 2013-02-27
CN101568716B (zh) 2012-05-30
JP4971463B2 (ja) 2012-07-11
CN101568716A (zh) 2009-10-28
US8226018B2 (en) 2012-07-24
US20090308956A1 (en) 2009-12-17
JP2010513781A (ja) 2010-04-30
DE102006062216A1 (de) 2008-06-26

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