EP1692393B1 - Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector - Google Patents

Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector Download PDF

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Publication number
EP1692393B1
EP1692393B1 EP04786749A EP04786749A EP1692393B1 EP 1692393 B1 EP1692393 B1 EP 1692393B1 EP 04786749 A EP04786749 A EP 04786749A EP 04786749 A EP04786749 A EP 04786749A EP 1692393 B1 EP1692393 B1 EP 1692393B1
Authority
EP
European Patent Office
Prior art keywords
injector
nozzle
valve plate
holding
internal combustion
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.)
Active
Application number
EP04786749A
Other languages
German (de)
French (fr)
Other versions
EP1692393A1 (en
Inventor
Friedrich Boecking
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
Priority to DE2003153169 priority Critical patent/DE10353169A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE2004/002028 priority patent/WO2005050003A1/en
Publication of EP1692393A1 publication Critical patent/EP1692393A1/en
Application granted granted Critical
Publication of EP1692393B1 publication Critical patent/EP1692393B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02Fuel-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
    • F02M47/027Electrically actuated valves draining the chamber to release the closing pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other 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
    • F02M63/0012Valves
    • F02M63/0031Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045Three-way valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001Control chambers formed by movable sleeves

Abstract

The invention relates to an injector which is used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector. Said injector comprises control means (17), particularly a piezo actuator (13), which are arranged in an injector body (10) and which actuate a control valve (20), which is disposed in a valve plate (18), by means of at least one multiplying piston (14). The invention also relates to a nozzle body (31) comprising a nozzle outlet which is disposed on the combustion chamber (free) side end thereof, a nozzle needle (33) which is arranged in an axially displaceable manner and/or which can is actuated in a longitudinal recess (32) of the nozzle body (31); a throttle disk (25) which is arranged between the nozzle body (31) and the control valve (20) and which is closed on the rear end (oriented away from the nozzle outlet) of the longitudinal recess (32). Said throttle disk forms an opening stop for the nozzle needle (33) which co-operates with the rear front surface (orientated away from the nozzle outlet) of the nozzle needle (33) and defines the opening stroke of the nozzle needle (33), and a control chamber (45) formed between the rear nozzle needle front surface and the throttle disk (25), said control chamber being hydraulically connected to a pressure connection (29) which is used to supply fuel. The invention is characterised in that a cylindrical retaining body (24) is arranged in the injector body (10), said retaining body receiving the multiplying piston(s) and the valve plate (18) containing the control valve (20).

Description

    State of the art
  • The invention relates to an injector according to the preamble of patent claim 1.
  • A CR injector of the aforementioned kind is by the DE 199 36,668-A1 known. A similar injector shows the DE ... (R.302723). A CR injector, in which the booster piston is actuated by a piezoelectric actuator, goes out of the DE 195 19 191 C2 out.
  • In general, such injectors require a comparatively high design effort on the sealing surfaces, in particular in the high-pressure area.
  • The object of the invention is to reduce the cost of the sealing surfaces.
  • Advantages of the invention
  • According to the invention, the object is achieved in an injector of the type described by the characterizing features of claim 1.
  • Advantageous developments of the basic idea of the invention can be taken from the patent claims 2-10.
  • By the invention, an integration of the valve plate in the booster piston receiving holding body is effected. This advantageously means an omission of a complete sealing level. The entire system is thereby considerably simplified and allows a cheaper production of the injector.
  • drawing
  • For a more detailed illustration of the invention, an embodiment which is illustrated in the drawing and described in detail below. The drawing shows - in partial view - an embodiment of a CR injector, in vertical longitudinal section.
  • Description of the embodiment
  • It designates an injector body of a CR injector, especially for use in diesel engines. In the injector 10, a sleeve-shaped translator housing 11 is arranged with a remote centric axial bore 12 in which a piezoelectric actuator 13 and a booster piston 14 are received axially displaceable. Between the piezoelectric actuator 13 and the booster piston 14, a booster chamber 15 is formed. The piezoelectric actuator 13 (which is connected in a conventional and therefore not shown manner to an electrical power supply) is biased by a translator housing 11 enclosing, designed as a tube spring biasing spring 16 in the direction of arrow 17, ie against the direction of action of the piezoelectric actuator 13.
  • In the axial extension of the booster housing 11 a total of 18 numbered valve plate is formed, which receives a control valve 20 in a stepped axial bore 19.
  • A significant feature is that the valve plate 18 together with the booster housing 11 forms a one-piece component, so that - on a designated 21 level - the need for a seal (compared to the booster housing 11) is eliminated. Translator housing 11 and valve plate 18 are received in a continuous, offset at 22 central axial bore 23 of a cylindrical holder body 24. The cylindrical holding body 24 in turn is fitted in the injector body 10.
  • Below the holding body 24 and valve plate 18 and sealingly connected to these components is a disc-shaped end part 25 - hereinafter referred to as "throttle disc" - arranged. In order to reduce the sealing area of the valve plate 18 with respect to the adjoining throttle plate 25 and thereby correspondingly reduce the required sealing forces, the valve plate 18 has a release 26 on its underside. The resulting reduced sealing surface diameter is designated d. In order to produce the pressure required for an effective sealing of the components 18 and 25 against each other, a translator housing 11 enclosing, designed as a tube spring biasing member 27 is provided, which pressurizes the valve plate 18 at 28 and the back of the shoulder 22 of the axial bore 23 of the holder body 24th supported.
  • As can also be seen from the drawing, a high-pressure channel 29 is incorporated into the holding body 24, which is in hydraulic communication via a high-pressure connection (not shown) with a high-pressure fuel accumulator (also known as common rail). The high-pressure channel 29 opens out at the lower end face of the holding body 24 and is hydraulically connected there to a hole 30 incorporated in the throttle plate 25.
  • A nozzle body 31 with a central longitudinal recess 32, which narrows at its lower end (not shown in the drawing) to a nozzle outlet, adjoins the throttle disk 25 in a sealing manner.
  • In the longitudinal recess 32 a total of 33 numbered nozzle needle is arranged axially movable. A lower, tapered end of the nozzle needle 33 may be conical and cooperates with the valve seat forming the lower end of the longitudinal recess 32 together (not shown).
  • Through the bore 30, the high-pressure fuel passes - via an annular space 34 - in the longitudinal recess 32 of the nozzle body 31 and thus to the nozzle exit.
  • As further apparent from the drawing, the nozzle needle 33 is surrounded at its upper end by a sleeve part 35 - leaving an annular gap 36 - which is supported with its cutting-shaped upper end 37 at the bottom of the throttle plate 25. An inserted into an annular groove 38 of the nozzle needle 33 snap ring 39 carries a retaining washer 40. Between the sleeve member 35 and the retaining washer 40 sits a prestressed helical compression spring 41 which exerts a force on the nozzle needle 33 in the direction of arrow 42, ie in the closed position of the nozzle needle 33 ,
  • The drawing also makes clear that from the annulus 34 under high pressure fuel on the one hand - via a bore 43 - in a valve chamber 44 of the control valve 20, on the other hand - passes through the annular gap 36 - in a control chamber 45. The control chamber 45 reaches its maximum volume at the closed position of the nozzle needle 33, which closes with its end the nozzle outlet (not shown). In the closed position, the nozzle needle 33 is held on the one hand by the pressure prevailing in the control chamber 45 fluid pressure and the other by the compression spring 41.
  • In the throttle plate 25, a further bore 46 is incorporated, which is on the one hand - via bore 30 and annular space 34 - with the high-pressure passage 29 and on the other hand - via a throttle bore 47 - with the control valve 20 in hydraulic operative connection. The throttle bore 47 acts as an inlet and outlet throttle. Between the booster piston 14 and the control valve 20, a space 48 is formed. In this area, a transverse bore 49 is incorporated in the translator housing 11, which serves the leakage return.

Claims (10)

  1. Injector for the injection of fuel into combustion spaces of internal combustion engines, in particular piezoactuator-controlled common-rail injector, with control means (17) primarily a piezoactuator (13), which are arranged in an injector body (10) and which via at least one intensifier piston (14) actuate a control valve (20) received in a valve plate (18), with a nozzle body (31), at whose (free) end located on the combustion-space side a nozzle outlet is formed, with a nozzle needle (33) which is arranged axially movably or actuatably in a longitudinal recess (32) of the nozzle body (31), with a throttle disc (25) which closes off the rear end (facing away from the nozzle outlet) of the longitudinal recess (32) and is arranged between the nozzle body (31) and control valve (20) which forms an opening abutment for the nozzle needle (33), in this case cooperates with the rear end face (facing away from the nozzle outlet) of the nozzle needle (33) and consequently limits the opening stroke of the nozzle needle (33), and with a control space (45) which is formed between the rear nozzle-needle end face and the throttle disc (25) and which is connected hydraulically to a pressure connection (29) serving for the fuel supply, characterized in that the injector body (10) has arranged in it a cylindrical holding body (24) which receives the intensifier piston or intensifier pistons (14) and the valve plate (18) containing the control valve (20).
  2. Injector according to Claim 1, characterized in that the valve plate (18) is fitted into a centric axial bore (23) of the holding body (24).
  3. Injector according to Claim 2, characterized in that, in the axial bore (23) of the holding body (24), above the valve plate (18), an intensifier housing (11) is arranged, which receives the intensifier piston or intensifier pistons (14) and a piezoactuator (13) in a centric axial bore (12).
  4. Injector according to Claim 1, 2 or 3, characterized in that the holding body (24) bears flat and sealingly with its (lower) end face located on the nozzle-body side against a contiguous (upper) end face of the throttle disc (25).
  5. Injector according to one or more of the preceding claims, characterized in that the valve plate (18) is braced sealingly against the upper end face of the throttle disc (25) by a prestressing element (27).
  6. Injector according to Claim 5, characterized in that the prestressing element (27) pressing the valve plate (18) against the throttle disc (25) is supported at the rear on a step (22) of the axial bore (23) of the holding body (24) and consequently on the holding body (24).
  7. Injector according to Claim 6, characterized in that the valve plate (18) has on its (lower) end face located on the throttle-disc side a clearance (26) which serves for reducing the sealing surface of the valve plate (18) with respect to the throttle disc (25).
  8. Injector according to Claim 5, 6 or 7, characterized in that there serves as prestressing element a tubular spring (27) which is arranged in the axial bore (23) of the holding body (24), in this case so as to surround the intensifier housing (11) over part of its length.
  9. Injector according to Claim 5, 6 or 7, with a piezoactuator (13) prestressed in the injector body (10) by a spring (16), characterized in that the prestressing spring (16) of the piezoactuator (13) serves at the same time as prestressing element for the valve plate (18).
  10. Injector according to one or more of the preceding claims, characterized in that the intensifier housing (11) and the valve plate (18) form a one-piece component.
EP04786749A 2003-11-14 2004-09-09 Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector Active EP1692393B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2003153169 DE10353169A1 (en) 2003-11-14 2003-11-14 Injector for injecting fuel into combustion chambers of internal combustion engines, in particular piezo-controlled common rail injector
PCT/DE2004/002028 WO2005050003A1 (en) 2003-11-14 2004-09-09 Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector

Publications (2)

Publication Number Publication Date
EP1692393A1 EP1692393A1 (en) 2006-08-23
EP1692393B1 true EP1692393B1 (en) 2007-07-25

Family

ID=34585079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04786749A Active EP1692393B1 (en) 2003-11-14 2004-09-09 Injector used to inject fuel into internal combustion chambers in internal combustion engines, particularly, a piezo-actuator controlled common-rail-injector

Country Status (9)

Country Link
US (1) US20070170286A1 (en)
EP (1) EP1692393B1 (en)
JP (1) JP2007510849A (en)
KR (1) KR20060120105A (en)
CN (1) CN1878949A (en)
AT (1) AT368177T (en)
BR (1) BRPI0416579A (en)
DE (2) DE10353169A1 (en)
WO (1) WO2005050003A1 (en)

Families Citing this family (26)

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Publication number Priority date Publication date Assignee Title
JP4428357B2 (en) * 2006-04-03 2010-03-10 株式会社デンソー Fuel injection valve
DE102006050163A1 (en) 2006-10-25 2008-04-30 Robert Bosch Gmbh Injector i.e. common rail injector, for injecting fuel into combustion chamber of internal combustion engine, has spring pressing piston on seat and casing on surface, where piston diameter in casing corresponds to piston diameter at seat
DE102006053126A1 (en) * 2006-11-10 2008-05-15 Robert Bosch Gmbh Fuel injector
DE102007020966A1 (en) 2007-05-04 2008-11-06 Robert Bosch Gmbh Automotive common rail fuel injection unit has coupler piston is fixed to the main valve control valve
DE102007047426A1 (en) 2007-05-15 2008-11-20 Robert Bosch Gmbh Injector with piezo actuator
DE102007034318A1 (en) 2007-07-24 2009-01-29 Robert Bosch Gmbh Injector
EP2280161A4 (en) 2008-04-10 2013-07-10 Bosch Corp Injection abnormality detection system and common-rail fuel injection controller
DE102008040170A1 (en) 2008-07-04 2010-01-07 Robert Bosch Gmbh Fuel injection valve, particularly injector for fuel injection system of air-compression, self-igniting internal combustion engine, has actuator and nozzle needle, where nozzle needle is actuated by control valve of actuator
DE102009002835A1 (en) 2009-05-06 2010-11-11 Robert Bosch Gmbh Piezoceramic for a piezo actuator or a piezo actuator module
DE102009026533A1 (en) 2009-05-28 2010-12-02 Robert Bosch Gmbh Piezoelectric actuator module for use in internal combustion engine, has Peltier element connected with module and comprising thermally conductive connection to temporarily flowing medium at side for delivering heat dissipated from module
DE102009029380A1 (en) 2009-09-11 2011-03-24 Robert Bosch Gmbh Method for manufacturing piezoceramic component i.e. piezoactuator module, for motor vehicle, involves discharging air flow through gas outlet pipe after sintering process, and blocking air flow by sealing air flow from inner wall of pipe
DE102009029489A1 (en) 2009-09-16 2011-03-24 Robert Bosch Gmbh Piezo actuator module has piezo actuator which is enclosed in casting compound and overlaid sleeve, where light-transmissive sleeve and jointing compound which is thermoset by ultra violet light
DE102009045486A1 (en) 2009-10-08 2011-04-14 Robert Bosch Gmbh Fuel injector, particularly common rail injector, for injecting fuel into combustion chamber of internal-combustion engine, has injection valve element that is adjusted in axial direction
DE102010001246A1 (en) 2010-01-27 2011-07-28 Robert Bosch GmbH, 70469 Process and materials for producing a piezoceramic for a piezoelectric actuator or a piezoelectric actuator module
DE102010008467A1 (en) 2010-02-18 2011-08-18 Continental Automotive GmbH, 30165 High pressure fuel injector for an internal combustion engine
DE102010038451A1 (en) 2010-07-27 2012-02-02 Robert Bosch Gmbh Fuel injector
DE102010040874A1 (en) 2010-09-16 2012-03-22 Robert Bosch Gmbh Fuel injector
DE102010043360A1 (en) * 2010-11-04 2012-05-10 Robert Bosch Gmbh Fuel injector
DE102010063540A1 (en) 2010-12-20 2012-06-21 Robert Bosch Gmbh Brennstoffeinspitzventil
DE102010064039A1 (en) 2010-12-23 2012-06-28 Robert Bosch Gmbh Fuel injector
CN102602142B (en) * 2011-01-18 2016-03-02 精工爱普生株式会社 Liquid injection apparatus
DE102011002955A1 (en) 2011-01-21 2012-07-26 Robert Bosch Gmbh Fuel injector
WO2013045688A1 (en) 2011-10-01 2013-04-04 Robert Bosch Gmbh An injection valve having wet actuator and simplified hydraulic transmission
EP2602475A1 (en) 2011-10-18 2013-06-12 Robert Bosch Gmbh An injection valve with a new transmission group
DE102013206383A1 (en) * 2013-04-11 2014-10-16 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
JP6365350B2 (en) * 2015-03-04 2018-08-01 株式会社デンソー Fuel injection valve

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DE10158337C1 (en) * 2001-11-28 2003-05-22 Bosch Gmbh Robert Fuel injection device used as an injector for internal combustion engines with direct injection comprises a discharge valve device having a valve component
DE10158588C1 (en) * 2001-11-29 2003-05-22 Bosch Gmbh Robert Fuel injection device comprises a housing, a recess formed in the housing, a valve element arranged in the recess, a sleeve surrounding the end section of the valve element in a fluid-tight manner, and a hydraulic control arm

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Also Published As

Publication number Publication date
BRPI0416579A (en) 2007-01-30
DE10353169A1 (en) 2005-06-16
AT368177T (en) 2007-08-15
US20070170286A1 (en) 2007-07-26
KR20060120105A (en) 2006-11-24
JP2007510849A (en) 2007-04-26
DE502004004465D1 (en) 2007-09-06
EP1692393A1 (en) 2006-08-23
CN1878949A (en) 2006-12-13
WO2005050003A1 (en) 2005-06-02

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