EP1296054A1 - Injecteur pour un moteur à combustion - Google Patents

Injecteur pour un moteur à combustion Download PDF

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Publication number
EP1296054A1
EP1296054A1 EP02017581A EP02017581A EP1296054A1 EP 1296054 A1 EP1296054 A1 EP 1296054A1 EP 02017581 A EP02017581 A EP 02017581A EP 02017581 A EP02017581 A EP 02017581A EP 1296054 A1 EP1296054 A1 EP 1296054A1
Authority
EP
European Patent Office
Prior art keywords
valve
inner recess
housing part
injection
valve housing
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
EP02017581A
Other languages
German (de)
English (en)
Other versions
EP1296054B1 (fr
Inventor
Martin Grieb
Stefan Haug
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 EP1296054A1 publication Critical patent/EP1296054A1/fr
Application granted granted Critical
Publication of EP1296054B1 publication Critical patent/EP1296054B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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

Definitions

  • the invention relates to an injection valve with the features the preamble of claim 1.
  • Such an injection valve is from DE 198 32 826 A1 known.
  • the injector shown there is an injector trained and is in a common rail injection system used for internal combustion engines, which have a high-pressure fuel reservoir has that with a high pressure pump in Connection is established.
  • the injector has one with the High-pressure fuel reservoir connected high-pressure fuel connection, a fuel low pressure port for connection to a fuel return device and an electrical Connection on which for the electrical control of a electrically actuated control valve of the injection valve, for example a solenoid valve.
  • the injection valve becomes a valve needle via a valve piston of fuel pressure prevailing in a control pressure chamber loaded in the closing direction.
  • the control pressure room is arranged in a valve piece inserted into the valve housing and via an inlet duct provided with an inlet throttle and an outlet duct provided with an outlet throttle with the high pressure fuel connection respectively connected to the fuel low pressure connection.
  • a Valve member of a control valve which, for example, as a drive has a magnetic actuator or a piezo actuator, the drain channel can be closed and opened and the fuel pressure in the control pressure chamber for the individual Actuating processes of the valve needle can be controlled.
  • the opening speed of the valve needle is opened Drain channel through the flow difference between inlet throttle and outlet throttle and thus ultimately through the fixed Set size ratio of inlet and outlet throttle certainly.
  • the inlet channel is for High-pressure fuel formed in several parts and includes one introduced into a valve housing part of the injection valve Inlet bore, which in a surrounding the valve piece Annulus in an inner recess of the valve housing part opens.
  • the inlet bore opens out with all of it Inner cross section in the inner recess.
  • the injection valve according to the invention with the characteristic Features of claim 1 has the advantage that the notch stresses in the intersection area between the inner recess and the access hole can be significantly reduced and thereby the strength of the injection valve is greatly increased.
  • the inner recess of the valve housing part of the injection valve only with part of their internal cross section. Reduce by changing the shape of the transition edge the advantage of high pressure material stresses acting in the circumferential direction. Without major ones The lifespan can be increased in manufacturing and reliability of the injection valves can be increased.
  • the inner recess extending part of the inlet bore with a Connect supply hole, which with the injection opening of the injector is connected.
  • About the Inlet bore is thus advantageous to both the valve piece surrounding inner recess of the valve housing part as also the supply hole connected to the injection opening supplied with high pressure fuel, so that the structure of the Injector can be simplified. Since no more Bores from the high pressure connection can start from High-pressure fuel accumulator incoming connection line directly be screwed onto the valve housing part and for example the fuel filter is integrated in the valve housing part become.
  • transition edge between the at least one inlet bore and the inner recess is particularly advantageous to define the transition edge between the at least one inlet bore and the inner recess to round off the valve housing part.
  • the rounding of the edge structure caused by the changed shape of the Transition edge an improved high pressure resistance in the intersection area. It is also advantageous that the transition edge during electrochemical or other processes, where a material processing tool in the Inner recess of the valve body part is inserted in Shaped differently and better than the state of the art is accessible.
  • Fig. 1a and Fig. 1b show a known from the prior art Fuel injector 1, which is for use in a fuel injection system is determined with a High-pressure fuel storage is equipped by a High pressure feed pump continuously with high pressure fuel is supplied.
  • the fuel injector 1 shown has a valve housing part 4 with an inner recess 20 which forms a longitudinal bore 5 over part of its length, in which a valve piston 6 is arranged, with its one end to one arranged in a nozzle body 65 Valve needle 60 acts.
  • the valve needle 60 is in one Pressure chamber 61 arranged via a supply bore 8 is supplied with fuel under high pressure.
  • valve piston 6 At a Opening stroke movement of the valve piston 6 becomes the valve needle 60 through the constantly on a pressure shoulder 68 of the valve needle attacking high fuel pressure in the pressure chamber the closing force of a spring 63 is raised. Then with one the injection opening 7 connected to the pressure chamber is injected of the fuel in the combustion chamber of the internal combustion engine. By lowering the valve piston 6, the valve needle in the closing direction in the valve seat 62 of the injection valve pressed and the injection process ends.
  • valve piston 6 is on its end facing away from the valve needle in a cylinder bore 11 out, which is introduced into a valve piece 12 is, which in a continuing the longitudinal bore 5 coaxial Hole 15 is used with a wider diameter.
  • the Valve piece 12 is fixed in a flange region 22 Screw member 23 clamped to the valve housing part 4.
  • the Inner recess 20 of the valve housing part 4 also has a further bore adjoining the bore 15 with an even wider diameter so that between the outer jacket of the valve piece 12 and the cylindrical Inner wall 35 of the further bore an annular space in the inner recess 20 arises.
  • a control pressure chamber 14 with a via an inlet channel a high-pressure fuel connection 3 is connected.
  • the inlet channel is essentially made up of three parts. A Radially through the wall of the valve member 12 leading bore 26, the inner walls of an inlet throttle over part of their length train with which the valve piece 12 is circumferential surrounding annulus constantly connected, which annulus sealed to the longitudinal bore 5 via a sealing ring 39 is and via an inlet bore 16 and a fuel filter 42 in constant connection with the high-pressure fuel connection 3 one screwable into the valve housing part 4 Connection piece 9 stands.
  • the inlet bore 16 opens the injection valves known in the prior art with their entire inner cross section in the inner recess 20 of the Valve housing part 4 a.
  • Via the inlet channel with inlet throttle is the control pressure chamber 14 that in the high-pressure fuel accumulator exposed to high fuel pressure.
  • the control pressure chamber 14 Coaxial with the valve piston 6 branches out of the control pressure chamber 14 continue from a bore in the valve piece 12, the a fuel drain channel provided with an outlet throttle 18 17 forms, which opens into a relief space 19, which is connected to a fuel low pressure connection 10 is, which in turn in a manner not shown is connected to a fuel return.
  • a valve seat 24 is formed with the a control valve member 25 which controls the injection valve Solenoid valve 30 cooperates.
  • the control valve member 25 is coupled to an anchor 27, which anchor with a Electromagnet of the solenoid valve 30 cooperates.
  • the anchor 27 and the control valve member 25 coupled to the armature are constantly supported by a housing-fixed Closing spring 31 acted in the closing direction, so that Control valve member 25 normally in the closed position on Valve seat 24 is present.
  • the opening and closing of the injection valve is as follows described controlled by the solenoid valve 30.
  • the Armature 27 is constantly in the closing direction by the closing spring 31 acts so that the control valve member 25 at electromagnet not energized in the closed position on the valve seat 24 is present and the control pressure chamber 14 to the discharge side 19 is closed so that there is over the inlet channel the high pressure builds up very quickly, which High-pressure fuel accumulator pending.
  • About the area of the The end face 13 generates the pressure in the control pressure chamber 14 Closing force on the valve piston 6 and in connection therewith standing valve needle 60, which is larger than that on the other hand in the opening direction as a result of the high pressure acting forces.
  • the control pressure chamber 14 through Opening the solenoid valve to the relief side 19, the pressure builds up in the small volume of the control pressure chamber 14 very quickly, since this is via the inlet throttle is decoupled from the high pressure side. Consequently predominates on the valve needle in the opening direction acting force from the high fuel pressure applied to the valve needle, so that the valve needle 60 moves upward and the at least one injection opening 7 for injection is opened.
  • solenoid valve 30 closes the fuel drain channel 17, the pressure in the control pressure chamber 14 by the fuel flowing in via the inlet channel be rebuilt so that the original Closing force is applied and the valve needle of the fuel injector closes.
  • Fig. 2 and Fig. 3 each show a cross section through the Injection valve according to the invention. Same reference numbers as 1a and 1b mean the same parts.
  • 2 is the Upper part of the valve housing part 4 shown, the continuous Inner recess 20 through the longitudinal bore 5 and bores 15 and 35 formed coaxially thereto becomes.
  • the holes 15 and 35 serve to accommodate the Valve piece 12, wherein the outer jacket of the valve piece with the inner wall of the bore 35 forms an annular space.
  • the High-pressure connection 3 is formed on a nozzle 9, which For example, in one piece with forging the valve housing part 4 is connected.
  • the high pressure connection 3 has a receiving bore 33 for a fuel filter from which location hole an access hole is located 16 extends into the valve housing part 4.
  • the access hole 16 cuts the inner recess 20 of the valve housing part 4 only with part of its internal cross section 44, as can best be seen in FIGS. 3 and 4.
  • the Access bore 16 cuts the inner recess 20 in the area the cylinder jacket-shaped wall 35 only with part 45 of its inner cross section 44, but not with part 46 of the Inner cross section 44. This changes the shape of the Transition edge 38 between the inlet bore 16 and the inner wall 35 of the inner recess 20 to form an elongated, narrow contour.
  • the distance is d the central axis 50 of the access bore 16 from the The central axis 51 of the inner recess 20 is equal to the radius R. the inner recess 20 in the region of the cylindrical shell Inner wall 35.
  • the distance d can also be larger or smaller than the radius R of the inner recess 20.
  • the access hole only the inner recess cuts with part of its inner cross section 44.
  • the access hole is 16 from the receptacle 33 of the high-pressure connection 3 so far introduced into the tubular base body 1 that they are a portion 36 a little way over the inner recess 20 out into the high-pressure connection 3 facing portion of the valve body part 4 extends where it is connected to the supply bore 8.
  • the embodiment shown is the end of the access hole connected to the supply bore.
  • the supply well 8 can also be T-shaped from section 36 of FIG Branch off access hole 16. The from the high pressure fuel connection 3 outgoing access bore 16 thus supplied advantageously the inner recess 20 and the supply bore 8 with high pressure fuel.
  • central axis 50 of the access bore 16 in the here shown preferred embodiment perpendicular to the central axis 51 of the inner recess 20 of the valve body part 4 runs, it is also possible that the central axis 50 of the Access hole 16 at an angle other than 90 ° runs to the central axis 51 of the inner recess.
  • transition edge 38 in the intersection area to increase the inner wall 35 and the access bore 16
  • the invention shown here is in no way based on injection valves limited and can for common rail systems applied to all injectors for internal combustion engines be where an access hole for high pressure fuel with an inner recess of the valve body part communicates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02017581A 2001-09-22 2002-08-07 Injecteur pour un moteur à combustion Expired - Lifetime EP1296054B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10146743A DE10146743A1 (de) 2001-09-22 2001-09-22 Einspritzventil für eine Brennkraftmaschine
DE10146743 2001-09-22

Publications (2)

Publication Number Publication Date
EP1296054A1 true EP1296054A1 (fr) 2003-03-26
EP1296054B1 EP1296054B1 (fr) 2005-07-27

Family

ID=7699908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017581A Expired - Lifetime EP1296054B1 (fr) 2001-09-22 2002-08-07 Injecteur pour un moteur à combustion

Country Status (3)

Country Link
EP (1) EP1296054B1 (fr)
JP (1) JP4184741B2 (fr)
DE (2) DE10146743A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005035970A1 (fr) * 2003-10-06 2005-04-21 Robert Bosch Gmbh Injecteur
WO2008128881A1 (fr) * 2007-04-19 2008-10-30 Robert Bosch Gmbh Zone d'intersection entre une chambre haute pression et un canal haute pression
DE102007050993A1 (de) 2007-10-25 2009-04-30 Robert Bosch Gmbh Kraftstoffinjektor für eine Brennkraftmaschine
CN106181236A (zh) * 2016-07-13 2016-12-07 无锡派乐科技有限公司 高压共轨式垫片及其制造方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005008466A1 (de) * 2005-02-24 2006-08-31 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005016010A1 (de) 2005-04-07 2006-10-12 Robert Bosch Gmbh Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE102005020360A1 (de) * 2005-05-02 2006-11-09 Robert Bosch Gmbh Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE102007044357A1 (de) * 2007-06-21 2008-12-24 Robert Bosch Gmbh Steuerventil für ein Kraftstoffeinspritzventil
DE102007043540A1 (de) 2007-09-12 2009-05-07 Robert Bosch Gmbh Leckagefreier Kraftstoffinjektor mit langer Düsennadel
CN104564472A (zh) * 2014-12-31 2015-04-29 无锡威孚马山油泵油嘴有限公司 高压共轨式垫片

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844385A1 (fr) * 1996-11-21 1998-05-27 Denso Corporation Dispositif d'injection de combustible à accumulation pour moteur à combustion interne
US5890471A (en) * 1996-08-31 1999-04-06 Isuzu Motors Limited Fuel injection device for engines
DE19827267A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr
DE19832826A1 (de) 1998-07-21 2000-01-27 Bosch Gmbh Robert Kraftstoff-Einspritzventil, Vorsteuerventil dafür und Verfahren zu dessen Zusammenbau
DE19859592C1 (de) * 1998-12-22 2000-05-04 Bosch Gmbh Robert Kraftstoffeinspritzventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890471A (en) * 1996-08-31 1999-04-06 Isuzu Motors Limited Fuel injection device for engines
EP0844385A1 (fr) * 1996-11-21 1998-05-27 Denso Corporation Dispositif d'injection de combustible à accumulation pour moteur à combustion interne
DE19827267A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr
DE19832826A1 (de) 1998-07-21 2000-01-27 Bosch Gmbh Robert Kraftstoff-Einspritzventil, Vorsteuerventil dafür und Verfahren zu dessen Zusammenbau
DE19859592C1 (de) * 1998-12-22 2000-05-04 Bosch Gmbh Robert Kraftstoffeinspritzventil

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005035970A1 (fr) * 2003-10-06 2005-04-21 Robert Bosch Gmbh Injecteur
WO2008128881A1 (fr) * 2007-04-19 2008-10-30 Robert Bosch Gmbh Zone d'intersection entre une chambre haute pression et un canal haute pression
US8245696B2 (en) 2007-04-19 2012-08-21 Robert Bosch Gmbh Area of intersection between a high-pressure chamber and a high-pressure duct
DE102007050993A1 (de) 2007-10-25 2009-04-30 Robert Bosch Gmbh Kraftstoffinjektor für eine Brennkraftmaschine
CN106181236A (zh) * 2016-07-13 2016-12-07 无锡派乐科技有限公司 高压共轨式垫片及其制造方法

Also Published As

Publication number Publication date
JP4184741B2 (ja) 2008-11-19
JP2003120459A (ja) 2003-04-23
EP1296054B1 (fr) 2005-07-27
DE10146743A1 (de) 2003-04-17
DE50203729D1 (de) 2005-09-01

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