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WO2003031797A1 - Systeme d'injection - Google Patents

Systeme d'injection Download PDF

Info

Publication number
WO2003031797A1
WO2003031797A1 PCT/DE2002/003728 DE0203728W WO03031797A1 WO 2003031797 A1 WO2003031797 A1 WO 2003031797A1 DE 0203728 W DE0203728 W DE 0203728W WO 03031797 A1 WO03031797 A1 WO 03031797A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
chamber
spring
nozzle device
control piston
Prior art date
Application number
PCT/DE2002/003728
Other languages
German (de)
English (en)
Inventor
Martin Neumaier
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2003031797A1 publication Critical patent/WO2003031797A1/fr

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
    • 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
    • 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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention relates to a nozzle device with a housing, a nozzle arrangement located in the housing, which can be acted upon from a nozzle chamber arranged in the housing, and a nozzle needle which is arranged along an axis between a first position and a second position by means of an along the axis is displaceable, which projects into the nozzle chamber, wherein it closes the nozzle arrangement in the first position and releases it in the second position, and is biased by a spring in a direction pointing from the second to the first position.
  • Such a nozzle device which is intended for use in a fuel injection device for an internal combustion engine, is apparent from DE 199 38 999 AI. With regard to the relevant technological background, reference is made to this document in its entirety.
  • the nozzle needle which determines a desired injection process by its movement from the first to the second position, during operation, i.e. while the nozzle device is pressurized with fluid under high pressure, except by the control piston by an additional spring along it Axis biased in one direction from the second to the first position. If the pressure of the fluid in the nozzle device from any for a reason, the pre-tensioning of the nozzle needle given by the control piston is reduced. A certain pre-tensioning of the nozzle needle is always necessary, even if the pressure inside the nozzle device is relatively low.
  • the nozzle needle must be prevented from moving away from the first position due to a negative pressure difference between the nozzle chamber and the internal combustion engine to which the nozzle device is connected due to a pressure drop in the nozzle device. If this was not done, hot gas from the internal combustion engine could penetrate into the nozzle chamber and oxidize the fluid present there, namely the fuel for the internal combustion engine, or attack components of the nozzle device.
  • the invention is based on the task of a different arrangement for the spring in the nozzle device find to avoid the disadvantage described.
  • a nozzle device is specified with a housing, a nozzle arrangement located in the housing, which can be acted upon from a nozzle chamber arranged in the housing, and a nozzle needle, which is arranged along an axis between a first position and a second position by means of a Control piston displaceable along the axis and protrudes into the nozzle chamber, wherein it closes the nozzle arrangement in the first position and releases it in the second position, and is biased by a spring in a direction pointing from the second to the first position, the spring according to the invention preloads the nozzle needle against the control piston.
  • the known bias of the nozzle needle against the housing is replaced by a bias of the nozzle needle against the control piston.
  • control piston is always in frictional engagement with the nozzle needle.
  • the pre-tensioned spring counteracts this adhesion, but this is completely compensated for by a suitable geometric design of the control piston and the nozzle needle.
  • the influence of the spring on the regular function of the nozzle device is thus eliminated. Only in the case in which the pressure applied to the nozzle device is no longer sufficient to maintain the frictional connection between the control piston and the nozzle needle, does the control piston and the nozzle needle move due to an effect of
  • the control piston can only correspond to the second position of the nozzle needle the position are pushed away, but the spring, provided there is sufficient preload, continues to exert a force on the nozzle needle. This force is sufficient to keep the nozzle needle in the first position and thus the nozzle arrangement more closed.
  • a preferred embodiment of the nozzle device consists in the control piston projecting into a control chamber which can be acted upon by a pressurized fluid from a high-pressure reservoir with the nozzle chamber, the control piston and the nozzle needle being set up in such a way that the control piston pushes the nozzle needle into pushes the first position. It is further preferred that there is a throttle between the control chamber and the high-pressure reservoir, and that a controllable valve is connected to the control chamber, which can be used to relieve the pressure in the control chamber, through which the nozzle needle reaches the second position.
  • this configuration enables the use of the nozzle device in a fuel injection device of an internal combustion engine, since in its intended operation it is functionally identical to the nozzle device known from the document cited at the beginning.
  • the nozzle device according to the two configurations described above is particularly advantageously connected to the high-pressure reservoir with another nozzle device. This opens up the function of the "common rail" known from automotive technology for the reservoir.
  • the spring in the nozzle device is preferably one
  • the nozzle device is also preferably used in a fuel injection device for an internal combustion engine, in particular a fuel injection according to the “common rail” principle for a diesel engine with several working units.
  • a fuel injection device for an internal combustion engine in particular a fuel injection according to the “common rail” principle for a diesel engine with several working units.
  • Figure 1 shows a schematic representation of a fuel injection device.
  • Figure 2 shows the area of the nozzle device, in which the spring is arranged, in section.
  • the nozzle device comprises a housing 1 with a nozzle arrangement 2 located therein. This can be acted upon from a nozzle chamber 3 arranged in the housing 1 and is closed by a nozzle needle 4 when it is in a first position (as shown) and released, if it is in a second position to the left of the first position.
  • the movement of the nozzle needle 4 takes place along an axis 5, which is also an axis of symmetry of the housing 1 and the nozzle needle 4.
  • the nozzle needle 4 is controlled by one
  • Control piston 6 In normal operation, the nozzle needle 4 and the control piston 6 are in the immediate frictional connection, which is conveyed in the exemplary embodiment via a plunger 15, which is firmly connected to one of the two components of the nozzle needle 4 and control piston 6 and the other component only touched. If the nozzle device is pressurized with a fluid under high pressure, then in the static case prevail in the nozzle chamber 3 and in the control chamber 8, which is arranged behind the nozzle chamber 3 with respect to the axis 5 and whose housing is rigidly and non-positively connected to the housing 1 , as indicated by dashed lines, identical pressure conditions.
  • the control piston 6 has a larger end face perpendicular to the axis 5 than the nozzle needle 4, and therefore the arrangement comprising the control piston 6 and the nozzle needle 4 is pressed to the right due to the corresponding force difference. In this way, the nozzle needle 4 reaches its first position and accordingly closes chend the nozzle assembly 2. If the pressure in the control chamber 8 and the nozzle chamber 3 drops below a certain threshold, then the force difference is no longer sufficient to push the control piston 6 to the right and to hold the nozzle needle 4 in the first position. Then the spring 7, which prestresses the nozzle needle 4 against the control piston 6, presses the control piston 6 to the left until it hits a stop 16, by means of which a second position of the nozzle needle 4 is intended for regular operation.
  • the prestressed spring 7 continues to exert a force on the nozzle needle 4 and holds it securely in its first position. With the pressure of the nozzle device dropping overall, it is avoided that the nozzle needle 4 is moved away from the first position and gases from the internal combustion engine 14, to which the nozzle device is connected, reach the nozzle device 2 through the nozzle arrangement 2.
  • the nozzle chamber 3 and the control chamber 8 are connected to a high-pressure reservoir 9 for the fluid which is under high pressure and is to be injected into the internal combustion engine 14 and are supplied from there with it.
  • a throttle 10 between the reservoir 9 and the control chamber 8.
  • the control chamber 8 is depressurized via a controllable valve 11, with part of the fluid flowing back from the control chamber 8 to the low-pressure reservoir 17. This reduces the force on the control piston 6, whereupon the latter moves to the left until it hits the stop 16.
  • the nozzle needle 4, on which the unchanged pressure of the high-pressure reservoir 9 still acts, follows the movement of the control piston 6 and thus reaches its second position, where it releases the nozzle arrangement 2 and causes the fluid to be injected into the internal combustion engine 14.
  • the injection process is ended by the controllable valve 11 being closed again, whereupon the original pressure is restored via the throttle 10 in the control chamber 8.
  • the nozzle device is connected with a further nozzle device 12 to one and the same high-pressure reservoir 9, with which it takes over the function of the known “common rail”.
  • the high-pressure reservoir 9 is supplied with fluid under high pressure via a pump 18; the pump 18 removes this Fluid to the low-pressure reservoir 17, which is under normal pressure. Both nozzle devices are controlled by the electronic control unit 19.
  • the nozzle device is also characterized by high operational reliability and uncomplicated manufacture; in particular, it is not necessary to ensure that all the springs installed are functionally the same as part of series production, because the operational parameters of these springs are not included in the regular operation of the nozzle devices.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un dispositif injecteur comprenant un boîtier (1), un dispositif d'injection (2) logé dans le boîtier et alimenté par une chambre d'injection (3) logée dans le boîtier (1) ainsi qu'une aiguille de gicleur (4) qui est mobile entre une première position et une deuxième position le long d'un axe (5) à l'aide d'un piston de commande (6) se déplaçant aussi le long de l'axe (5) et qui pénètre dans la chambre d'injection (3). Dans la première position, l'aiguille ferme le dispositif d'injection (2) et, dans la deuxième position, elle l'ouvre. L'aiguille passe de la deuxième à la première position sous l'action de la précontrainte d'un ressort (7). Par sa précontrainte,le ressort (7) plaque l'aiguille contre le piston de commande. Une application préférée du dispositif d'injection et son utilisation dans le système d'injection de carburant d'un moteur à combustion interne.
PCT/DE2002/003728 2001-10-05 2002-10-01 Systeme d'injection WO2003031797A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10149286.3 2001-10-05
DE2001149286 DE10149286C2 (de) 2001-10-05 2001-10-05 Düseneinrichtung, insbesondere zur Kraftstoffeinspritzung

Publications (1)

Publication Number Publication Date
WO2003031797A1 true WO2003031797A1 (fr) 2003-04-17

Family

ID=7701593

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/003728 WO2003031797A1 (fr) 2001-10-05 2002-10-01 Systeme d'injection

Country Status (2)

Country Link
DE (1) DE10149286C2 (fr)
WO (1) WO2003031797A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006050065A1 (de) * 2006-10-24 2008-04-30 Siemens Ag Fluiddosiervorrichtung

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779149A (en) 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
US5806766A (en) 1996-05-08 1998-09-15 Siemens Aktiengesellschaft Injection valve
US5857662A (en) 1994-04-14 1999-01-12 Siemens Aktiengesellschaft Electrohydraulic stop device
US5875632A (en) 1994-11-30 1999-03-02 Siemens Aktiengesellschaft Electrohydraulic drive
EP0937891A2 (fr) * 1998-02-19 1999-08-25 LUCAS INDUSTRIES public limited company Injecteur de combustible
US6062533A (en) 1998-05-14 2000-05-16 Siemens Aktiengesellschaft Apparatus and method for valve control
US6066912A (en) 1997-04-08 2000-05-23 Siemens Aktiengesellschaft Device for transmitting a deflection of an actuator
US6119952A (en) 1998-08-27 2000-09-19 Siemens Aktiengesellschaft Device and method for dosing fluid
US6145492A (en) 1998-05-19 2000-11-14 Siemens Aktiengesellschaft Control valve for a fuel injection valve
US6148842A (en) 1997-07-01 2000-11-21 Siemens Aktiengesellschaft Compensation element for the compensation of temperature-conditioned length changes of an object
US6168132B1 (en) 1997-12-23 2001-01-02 Siemens Aktiengesellschaft Injection valve with control valve
US6186474B1 (en) 1997-12-23 2001-02-13 Siemens Aktiengesellschaft Injection valve with a compensating surface
US6194812B1 (en) 1996-09-30 2001-02-27 Siemens Aktiengesellschaft Controller with an actuator of controllable length and device for transmitting the deflection of an actuator
EP1079095A2 (fr) * 1999-08-20 2001-02-28 Delphi Technologies, Inc. Injecteur de combustible
DE19938999A1 (de) 1999-08-17 2001-03-01 Siemens Ag Einspritzventil mit einem geschmierten Übertragungselement
US20010017324A1 (en) * 1999-02-26 2001-08-30 Dana R. Coldren Two piece guided nozzle assembly for a fuel injector
WO2002040854A1 (fr) * 2000-11-17 2002-05-23 Isuzu Motors Limited Dispositif amortisseur de levee de pointeau pour injecteur de carburant et procede d'amortissement de levee de pointeau
US20020073973A1 (en) * 2000-12-19 2002-06-20 Desai Chetan J. Fuel injection system with common actuation device and engine using same

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5857662A (en) 1994-04-14 1999-01-12 Siemens Aktiengesellschaft Electrohydraulic stop device
US5875632A (en) 1994-11-30 1999-03-02 Siemens Aktiengesellschaft Electrohydraulic drive
US5806766A (en) 1996-05-08 1998-09-15 Siemens Aktiengesellschaft Injection valve
US5779149A (en) 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
US6194812B1 (en) 1996-09-30 2001-02-27 Siemens Aktiengesellschaft Controller with an actuator of controllable length and device for transmitting the deflection of an actuator
US6066912A (en) 1997-04-08 2000-05-23 Siemens Aktiengesellschaft Device for transmitting a deflection of an actuator
US6148842A (en) 1997-07-01 2000-11-21 Siemens Aktiengesellschaft Compensation element for the compensation of temperature-conditioned length changes of an object
US6186474B1 (en) 1997-12-23 2001-02-13 Siemens Aktiengesellschaft Injection valve with a compensating surface
US6168132B1 (en) 1997-12-23 2001-01-02 Siemens Aktiengesellschaft Injection valve with control valve
EP0937891A2 (fr) * 1998-02-19 1999-08-25 LUCAS INDUSTRIES public limited company Injecteur de combustible
US6062533A (en) 1998-05-14 2000-05-16 Siemens Aktiengesellschaft Apparatus and method for valve control
US6145492A (en) 1998-05-19 2000-11-14 Siemens Aktiengesellschaft Control valve for a fuel injection valve
US6119952A (en) 1998-08-27 2000-09-19 Siemens Aktiengesellschaft Device and method for dosing fluid
US20010017324A1 (en) * 1999-02-26 2001-08-30 Dana R. Coldren Two piece guided nozzle assembly for a fuel injector
DE19938999A1 (de) 1999-08-17 2001-03-01 Siemens Ag Einspritzventil mit einem geschmierten Übertragungselement
EP1079095A2 (fr) * 1999-08-20 2001-02-28 Delphi Technologies, Inc. Injecteur de combustible
WO2002040854A1 (fr) * 2000-11-17 2002-05-23 Isuzu Motors Limited Dispositif amortisseur de levee de pointeau pour injecteur de carburant et procede d'amortissement de levee de pointeau
US20020073973A1 (en) * 2000-12-19 2002-06-20 Desai Chetan J. Fuel injection system with common actuation device and engine using same

Also Published As

Publication number Publication date
DE10149286A1 (de) 2003-05-08
DE10149286C2 (de) 2003-12-11

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