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WO2003038266A1 - Soupape de commande de debit de liquides - Google Patents

Soupape de commande de debit de liquides Download PDF

Info

Publication number
WO2003038266A1
WO2003038266A1 PCT/DE2002/003701 DE0203701W WO03038266A1 WO 2003038266 A1 WO2003038266 A1 WO 2003038266A1 DE 0203701 W DE0203701 W DE 0203701W WO 03038266 A1 WO03038266 A1 WO 03038266A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
inlet
nozzle
nozzle needle
control chamber
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.)
Ceased
Application number
PCT/DE2002/003701
Other languages
German (de)
English (en)
Inventor
Werner Hassel
Christian Postler
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 WO2003038266A1 publication Critical patent/WO2003038266A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the present invention relates to a valve for controlling liquids, in particular for a fuel storage injection system of an internal combustion engine according to the preamble of claim 1.
  • Valves for controlling liquids are known, for example, as fuel injection valves in different configurations.
  • the known valves have a nozzle needle which is arranged in a nozzle body.
  • the nozzle needle is controlled via a control valve which is connected to an actuator, for example a piezo actuator.
  • the nozzle needle is arranged in a control chamber, which is formed by a control chamber sleeve arranged at the end of the nozzle needle and an intermediate disk.
  • a flow restrictor goes from the control room to the control valve.
  • an inlet throttle is provided in the control chamber sleeve in order to provide a connection between the control chamber and the high-pressure region of the valve.
  • a nozzle closing spring which is connected to the nozzle needle, acts on the control chamber sleeve by a closing force for the nozzle needle provide. If fuel is to be injected, the control valve is opened so that the control chamber is connected to a low-pressure region of the valve via the outlet throttle, so that the nozzle needle lifts off its seat. The nozzle needle moves against the force of the nozzle closing spring. When the injection is to be ended, the control valve is closed again, so that the original pressure can build up again in the control chamber, so that the nozzle needle closes the injection nozzles of the valve again.
  • the valve according to the invention with the features of claim 1 has the advantage that it has a simple and compact structure and is particularly inexpensive to manufacture. ' The valve closing time can be reduced further. There According to the invention, a smaller number of sealing points are present, a safe and reliable sealing between the high-pressure and low-pressure areas of the valve can also be ensured.
  • the valve comprises a piezo actuator, a translator, a control valve, an intermediate disk and a nozzle needle arranged in a nozzle body. One end of the nozzle needle closes an injection opening and the other end of the nozzle needle is arranged in a control room. A first inlet, an outlet, a second inlet and a high-pressure bore are arranged in the intermediate disk.
  • the first inlet connects a high pressure area with the control room.
  • the drain connects the control room with the control valve.
  • the second inlet connects the high pressure area with the control valve.
  • a faster closing of the nozzle needle is achieved in particular via the second inlet of the intermediate disk, since during the closing process, fluid can flow into the control chamber via the first inlet on the one hand, and via the second inlet and outlet to the other Control room flows.
  • the flow direction in the drain is reversed compared to an open valve.
  • the control chamber is particularly preferably formed by a recess in the nozzle body. This makes it possible to provide a particularly compact valve with small axial dimensions.
  • control space is formed by a cutout in the intermediate disk. This allows even smaller axial dimensions of the valve to be achieved. It should be noted that the control chamber can also be formed in such a way that it is partially formed both in the nozzle body and in the intermediate disk and thus arises when the valve is mounted on the transition region between the intermediate disk and the nozzle body.
  • a spring seat is formed in the washer to receive a nozzle closing spring.
  • the nozzle closing spring is used to close the nozzle spring, the spring force having to be overcome when the nozzle needle is opened.
  • the nozzle closing spring is supported on the end face of the intermediate piece directed towards the nozzle needle.
  • a spring seat is preferably formed at the end of the nozzle needle facing the control chamber.
  • the second inlet is connected to the high-pressure region of the valve via a separate bore in the nozzle body.
  • the second inlet is arranged in the washer in such a way that it branches off directly from the high-pressure bore of the washer. This eliminates the need for a second separate hole in the nozzle body.
  • the nozzle needle is closed exclusively by the fluid pressure from the high-pressure region of the valve, which is fed into the control chamber via the first and the second inlet.
  • a chamfer is preferably provided on the end of the nozzle needle facing the control chamber.
  • valve according to the invention for controlling liquids is used in particular as a fuel injection valve in storage injection systems.
  • Both a mechanical and a hydraulic translator can be used as the translator for the stroke of the piezo actuator.
  • FIG. 1 shows a schematic sectional view of a fuel injection valve according to a first exemplary embodiment of the present invention
  • FIG. 2 shows an enlarged detailed view of the valve shown in FIG. 1,
  • FIG. 3 shows a schematic partial cross-sectional view of a fuel injection valve according to a second exemplary embodiment of the present invention
  • FIG. 4 shows a schematic partial cross-sectional view of a fuel injection valve according to a third exemplary embodiment of the present invention.
  • FIG. 5 shows a schematic partial cross-sectional view of a fuel injection valve according to a fourth exemplary embodiment of the present invention.
  • a fuel injection valve 1 according to a first exemplary embodiment of the present invention is described below with reference to FIGS. 1 and 2. As shown in Figure 1, this includes
  • Fuel injection valve a piezo actuator 2, which is connected to a hydraulic booster 4 via an actuating piston 3.
  • the hydraulic intensifier 4 consists of a first piston 5, a second piston 6 and a pressure chamber 7 arranged between the two pistons.
  • the second piston 6 is connected to a control valve 8 via an actuating element.
  • the control valve 8 comprises a valve member 9, which bears against a valve seat 10 when the piezo actuator is not actuated.
  • the fuel injection valve comprises an intermediate piece 12 and a nozzle body 13, in which a nozzle needle 14 is arranged.
  • the nozzle needle 14 opens or closes a plurality of injection openings 20 through which fuel can be injected into a combustion chamber (not shown) of an engine.
  • the lifting height of the nozzle needle 14 is designated by H in FIGS. 1 and 2.
  • the intermediate piece 12 is shown in detail in FIG.
  • a high-pressure bore 21, an inlet throttle 22, an outlet throttle 23 and a second inlet 24 are formed in the intermediate piece 12.
  • the high-pressure bore 21 connects a high-pressure line 19, via which a fuel under high pressure is fed from a high-pressure pump, not shown, to a bore 17 in the nozzle body 13.
  • the bore 17 leads to a high-pressure region 16 of the valve.
  • the inlet throttle 22 connects the high-pressure bore 21 to a control chamber 25.
  • the control chamber 25 is connected to the control valve 8 via the outlet throttle 23.
  • the control valve 8 is connected to the high-pressure region 16 of the valve via the second inlet 24 and a bore 18 (cf. FIG. 2).
  • One end of the nozzle needle 14 is also arranged in the control chamber 25, a wide chamfer 29 being formed on the nozzle needle 14.
  • a nozzle closing spring 26 is arranged in a recess 27, which is also formed in the intermediate piece 12. The nozzle closing spring 26 is thus supported on the one hand on the intermediate piece 12 and on the other hand on the nozzle needle 14.
  • the individual components of the valve are held together in a known manner via a nozzle clamping nut 15 (cf. FIG. 1).
  • the nozzle needle 14 is further guided into the nozzle body 13 via a needle guide 30.
  • a shoulder 31 is formed on the nozzle needle 14 and is positioned in the high-pressure region 16 of the valve.
  • the pressure in the control chamber 25 drops, as a result of which the nozzle needle 14 is moved upward into the control chamber 25 by the pressure on the shoulder 31 in the high-pressure region 16, so that the nozzle needle 14 lifts off its seat.
  • fuel is injected at the injection openings 20.
  • the nozzle needle 14 is moved against the force of the nozzle closing spring 26.
  • the piezo actuator 2 is activated again, so that it shortens again to its original length.
  • the valve member 9 moves back onto its valve seat 10, so that the connection to the low-pressure region 11 is interrupted again.
  • a higher pressure can build up in the control chamber 25, which leads to the closing of the nozzle needle 14.
  • This higher pressure in the control chamber 25 is provided on the one hand via the connection to the high-pressure bore 21 provided by the inlet throttle 22 and also via the connection from the high-pressure region 16 via the bore 18 and the second inlet 24 and the outlet throttle 23.
  • the flow direction reverses in the Flow restrictor 23 um. This makes it possible according to the invention that the nozzle needle 14 closes more quickly.
  • the formation of the intermediate disks 12 with the high-pressure bore 21, the inlet throttle 22, the outlet throttle 23, the second inlet 24 and the recess 27 for receiving the nozzle closing spring 26 thus enables a particularly compact valve according to the invention.
  • the control chamber 25 is formed in the nozzle body 13.
  • the control chamber sleeves used in the prior art can be dispensed with according to the invention, which on the one hand significantly increase the manufacturing costs and on the other hand lead to sealing problems in the area of the sleeves.
  • the valve 1 according to the invention the high pressure area and the low pressure area are safely separated from one another via the control valve 8.
  • the symmetrical arrangement of the two bores 17 and 18 achieves a symmetrical pressure distribution in the nozzle body 13.
  • a fuel injection valve according to a second exemplary embodiment of the present invention is described below with reference to FIG. 3.
  • the same or functionally identical parts are designated with the same reference numerals as in the first embodiment.
  • the nozzle closing spring 26 is arranged in the second exemplary embodiment in such a way that it is supported on the one hand on an end face of the intermediate piece 12 directed towards the nozzle needle 14 and on the other hand on a spring seat 28 formed on the nozzle needle 14.
  • an enlarged cutout it would also be possible for an enlarged cutout to be arranged in the intermediate piece 12.
  • Nozzle body 13 and extends into the intermediate piece 12.
  • the second exemplary embodiment essentially corresponds to the first exemplary embodiment, so that reference can be made to the description given there.
  • a third exemplary embodiment according to the present invention is described below with reference to FIG. Identical or functionally identical parts are designated with the same reference symbols as in the previous exemplary embodiments.
  • the valve 1 according to the third exemplary embodiment has no nozzle closing spring.
  • the nozzle needle 14 is closed in such a way that the closing operation is carried out exclusively by the hydraulic pressure.
  • the surfaces on the shoulder 31 of the nozzle needle 14 on the one hand and the surface of the nozzle needle 14 facing the control chamber 25 are different, so that a resultant force is generated in the direction of the closing direction of the nozzle needle 14 when the control valve 8 is closed.
  • the third exemplary embodiment corresponds to the two previous exemplary embodiments, so that reference can be made to the description there.
  • FIG. 5 shows a fuel valve 1 according to a fourth exemplary embodiment of the present invention. Identical or functionally identical parts are again identified by the same reference numerals as in the previous exemplary embodiments.
  • Embodiment also no closing spring. Furthermore, the second high-pressure inlet 24 is arranged in the intermediate piece 12 such that the second inlet establishes a direct connection between the high-pressure bore 21 and the control valve 8 (cf. FIG. 5). This makes it possible to dispense with the second bore in the nozzle body 13. As a result, the valve according to the invention can be manufactured even more cost-effectively.
  • the function of the valve again corresponds to the function of the exemplary embodiments described above, the second inlet 24 also being used for faster closing of the nozzle needle 14. It should be noted that the arrangement of the second inlet 24 according to the fourth exemplary embodiment can also be used in the other exemplary embodiments.
  • the present invention thus relates to a valve for controlling liquids with a piezo actuator 2, a translator 3, a control valve 8, an intermediate disk 12 and a nozzle needle 14 arranged in a nozzle body 13.
  • a first inlet 22 is connected to the intermediate disk 12 a high-pressure line 19 with a control chamber 25 is provided.
  • an outlet 23 for connecting the control chamber 25 to the control valve 8, a second inlet 24 for connecting the high pressure region to the control valve 8 and a high pressure bore 21 are arranged in the intermediate disk 12.

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

La présente invention concerne une soupape de commande de débit de liquides, qui comprend un actionneur piézo (2), un dispositif de transmission (3), une soupape de commande (13), un disque intermédiaire (12) et un pointeau d'injecteur (14) disposé dans un corps d'injecteur (13). Dans le disque intermédiaire (12) est ménagé un premier orifice d'entrée (22) qui sert à la communication entre une conduite haute pression (19) et une chambre de commande (25). Le disque intermédiaire (12) comporte également un orifice de sortie (23) qui sert à la communication entre la chambre de commande (25) et la soupape de commande (8) et un second orifice d'entrée (24) qui sert à la communication entre la zone haute pression et la soupape de commande (8), ainsi qu'un alésage haute pression (21). Selon l'invention, on obtient une soupape bon marché et sans fuite.
PCT/DE2002/003701 2001-10-20 2002-09-30 Soupape de commande de debit de liquides Ceased WO2003038266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001152253 DE10152253B4 (de) 2001-10-20 2001-10-20 Ventil zum Steuern von Flüssigkeiten
DE10152253.3 2001-10-20

Publications (1)

Publication Number Publication Date
WO2003038266A1 true WO2003038266A1 (fr) 2003-05-08

Family

ID=7703423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/003701 Ceased WO2003038266A1 (fr) 2001-10-20 2002-09-30 Soupape de commande de debit de liquides

Country Status (2)

Country Link
DE (1) DE10152253B4 (fr)
WO (1) WO2003038266A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743299A1 (de) * 1997-09-30 1999-04-22 Siemens Ag Vorrichtung zum Steuern eines Stellgliedes
GB2335000A (en) * 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve
EP0957262A2 (fr) * 1998-05-13 1999-11-17 LUCAS INDUSTRIES public limited company Injecteur de combustible
EP1026393A2 (fr) * 1999-02-05 2000-08-09 Siemens Aktiengesellschaft Injecteur pour système d'injection de moteur à combustion interne
DE10030119A1 (de) * 1999-06-21 2000-12-28 Toyota Motor Co Ltd Kraftstoffeinspritzgerät
DE10037527A1 (de) * 1999-08-02 2001-02-15 Denso Corp Piezoelektrische Einspritzeinrichtung
DE19936668A1 (de) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common-Rail-Injektor
US20020050535A1 (en) * 2000-10-30 2002-05-02 Toshihiko Igashira Valve actuating device and fuel injector using same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2336627A (en) * 1998-04-24 1999-10-27 Lucas Ind Plc Fuel injector with biassing spring in blind bore in valve needle
GB9813476D0 (en) * 1998-06-24 1998-08-19 Lucas Ind Plc Fuel injector

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743299A1 (de) * 1997-09-30 1999-04-22 Siemens Ag Vorrichtung zum Steuern eines Stellgliedes
GB2335000A (en) * 1998-03-05 1999-09-08 Lucas Ind Plc Fuel injector having a restricted fuel flow path provided by a needle valve
EP0957262A2 (fr) * 1998-05-13 1999-11-17 LUCAS INDUSTRIES public limited company Injecteur de combustible
EP1026393A2 (fr) * 1999-02-05 2000-08-09 Siemens Aktiengesellschaft Injecteur pour système d'injection de moteur à combustion interne
DE10030119A1 (de) * 1999-06-21 2000-12-28 Toyota Motor Co Ltd Kraftstoffeinspritzgerät
DE10037527A1 (de) * 1999-08-02 2001-02-15 Denso Corp Piezoelektrische Einspritzeinrichtung
DE19936668A1 (de) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common-Rail-Injektor
US20020050535A1 (en) * 2000-10-30 2002-05-02 Toshihiko Igashira Valve actuating device and fuel injector using same

Also Published As

Publication number Publication date
DE10152253B4 (de) 2014-10-09
DE10152253A1 (de) 2003-04-30

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