EP2519730A1 - Einspritzventil für eine fluid - Google Patents
Einspritzventil für eine fluidInfo
- Publication number
- EP2519730A1 EP2519730A1 EP10779003A EP10779003A EP2519730A1 EP 2519730 A1 EP2519730 A1 EP 2519730A1 EP 10779003 A EP10779003 A EP 10779003A EP 10779003 A EP10779003 A EP 10779003A EP 2519730 A1 EP2519730 A1 EP 2519730A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blind hole
- valve
- fluid
- housing
- connecting piece
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 239000012530 fluid Substances 0.000 title claims abstract description 18
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 37
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 11
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 11
- 239000004033 plastic Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000005476 soldering Methods 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 230000004323 axial length Effects 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- 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
-
- 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
- F02M61/08—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 the valves opening in direction of fuel flow
-
- 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
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
Definitions
- the invention is based on an injection valve for a fluid, in particular for fuel, according to the preamble of claim 1.
- valve housing encloses a circular cylindrical in cross-section cavity in which a
- piezoelectric or magnetostrictive actuator is arranged for valve actuation.
- the annular in cross-section housing wall is longitudinally radially thickened on one side and is provided in the thickening region with an axial bore in which the tube is guided.
- the tube is bent at the lower end by about 90 ° and inserted into an opening in the valve chamber radial opening in the nozzle body and with the
- Nozzle body welded or soldered. At the end facing away from the nozzle body, the pipe is attached to the inlet nozzle and firmly connected to the inlet nozzle.
- the injection valve according to the invention with the features of claim 1 has the advantage that by the threaded connection between the fluid-carrying tube and the valve chamber containing nozzle body and by the at least one sealing element integrated in the threaded connection a connection between the nozzle body and tube, which is highly resilient and the increasingly required high
- the fluid connection between the blind hole having the internal thread and the valve chamber is formed by a transverse bore extending in the nozzle body, which is below the
- Valve chamber manufacturing technology realize very low.
- the at least one sealing element is a sealing ring made of polytetrafluoroethylene (PTFE), which rests in an annular groove within the external thread.
- PTFE polytetrafluoroethylene
- Sealing element arranged, which may for example also be formed as a PTFE sealing ring. With the leakage hole can possibly over the first
- Seal element occurring leaks to the outside, e.g. in the crankcase of the internal combustion engine, are passed. Since a pressure of about 5 bar usually prevails in the crankcase, it is ensured by the second sealing element that no leakage enters the interior of the valve housing, in which the non-fuel-resistant actuator for actuating the injection valve is arranged. In addition, via the leakage bore, a check of the tightness of the first sealing element
- the external thread is formed on a hollow-cylindrical connecting piece separated from the tube and connected to the tube Pipe end attached, preferably partially inserted into this, and is firmly connected to the tube.
- the connection is made by soldering or welding.
- the tube is guided in a coaxial to the blind hole in the nozzle body passage opening, which is formed in a valve housing at its remote from the nozzle body housing end connecting piece.
- the axial length of the tube is dimensioned so that it protrudes axially when fully screwed into the internal thread in the blind hole connector over the connector.
- a prefabricatable assembly of inlet nozzle, pipe and connector is achieved in manufacturing technology advantageously advantageous that can be easily mounted by being inserted into the valve housing through the through hole in the connector and screwed into the blind hole in the nozzle body.
- the previously used in the external thread of the connector is achieved in manufacturing technology advantageously advantageous that can be easily mounted by being inserted into the valve housing through the through hole in the connector and screwed into the blind hole in the nozzle body.
- the connecting piece carries an external thread and is held in the through hole in the connecting piece an internal thread for screwing the connecting piece.
- Inlet nozzle in the connection piece increases the robustness of the injection valve against rough operation. Both with only passed through the connector pipe and screwed inlet nozzle, the interface between the connector and pipe or inlet nozzle is sealed, which is preferably by a on the
- Inlet nozzle is realized. In such an additional seal can be omitted if, according to an advantageous embodiment of the invention on the
- FIG. 1 shows a longitudinal section of an injection valve for a fluid
- Figure 2 is an enlarged view of the section II in Figure 1
- Figure 3 is a same view as in Figure 1 of a modified injection valve
- Figure 4 is an enlarged view of the section IV in Figure 3.
- the injection valve shown in longitudinal section in FIG. 1, for a fluid, e.g. for fuel in a fuel supply system for internal combustion engines, has e.g. sleeve-like valve housing 1 1, whose one end of a housing of a nozzle body 12th
- Nozzle body 12 and fitting 13 are fixedly connected to the valve housing 1 1, e.g. in each case by a circumferential weld seam 14, 15.
- a spray opening 17 enclosed by a valve seat 16 is formed.
- the valve seat 16 is preceded by a valve chamber 18.
- Valve chamber 18 immersed in a nozzle body 12 slidably guided valve needle 19 therethrough, with a closing head 191 of a nozzle body 12 and on the valve needle 19 is supported valve closing spring 20 closing the
- valve needle 19 For actuating the outwardly against the restoring force of the valve closing spring 20 opening valve needle 19 is a piezoelectric actuator 21 which is received in series with a hydraulic coupler 22 in the valve housing 1 1 and clamped between the valve needle 19 and connector 13 axially frictionally. Structure and function of actuator 21 and coupler 22 are known and described for example in DE 103 19 599 A1 or DE 10 2007 028 490 A1.
- an inlet nozzle 23 is arranged for attaching a fuel supply line.
- a guided through the valve housing 1 1 tube 30 provides a fluid connection between the
- axial blind hole 24 formed with internal thread and screwed the tube 30 at its end remote from the inlet pipe end 23 by means of an external thread in the internal thread.
- the threaded connection of inner and outer threads is designated 25 in FIG.
- the external thread is not directly on the pipe end of the cut thin-walled tube 30, but on a thick-walled, hollow cylindrical connector 26 which is used with a reduced diameter pin 261 in the pipe end and welded or soldered thereto, as illustrated in Figure 2 weld 27 illustrates.
- a fluid connection to the valve chamber 18 is made below the threaded connection 25.
- This fluid connection is realized by means of a transverse bore 28, which opens in the blind hole 24, here in the blind hole bottom. As Figure 1 shows, the transverse bore 28 is radially in the
- Nozzle body 12 introduced and sealed at the end remote from the blind hole 24 by means of a pressed ball 29 pressure-tight.
- a sealing element 31 is arranged, which is a fluid leakage from the
- non-fuel resistant actuator 21 rests reliably prevented.
- the sealing element 31 is a
- Sealing ring 32 made of polytetrafluoroethylene (PTFE), which rests in an inserted in the connecting piece 26 within the external thread into the connecting piece 26 into the annular groove 33.
- PTFE polytetrafluoroethylene
- the sealing ring 32 by means of a conical expanding mandrel, which covers the external thread up to the annular groove 33, expanded and snapped into the annular groove 33.
- the sealing ring 32 seals the threads reliably even at high pressures.
- the internal or external thread of the threaded connection 25 may also be provided with a sealing layer of an elastomer, e.g. Teflon, coated, which also produces a reliable seal between the threads when screwed.
- the through the interior of the valve housing 1 1 between the housing wall and actuator 21 extending, fluid-carrying tube 30 is passed in a coaxial with the blind hole 24 inserted through hole 34 in the connector 13, wherein the length of the tube 30 is dimensioned so that it is completely into the internal thread in the blind hole 24 screwed connector 26 projects axially beyond the connector 13.
- the inlet nozzle 23 is placed on the protruding pipe end and pressed with the pipe end and welded (weld seam 35 in Figure 1).
- the tube 30, the connecting piece 26 and the inlet nozzle 23 are joined to form a structural unit. This unit is by the Through hole 34 in the connector 13 and passed through the connector 26 in the blind hole 24 of the nozzle body 12 is screwed.
- the inlet nozzle 23 is provided with two diametrical flattened portions 231. After complete screwing of the connecting piece 26 in the blind hole 24, a plastic body 36 is sprayed onto the connecting piece 13, which is the
- Inlet piece 23 hermetically encloses in its lower portion facing the connection piece 13. As a result, on the one hand, the through hole 34 in
- Connector 13 is made.
- in the nozzle body 12 is still a
- Leakage bore 37 introduced, which opens in the blind hole 24 in the threaded connection 25.
- a second sealing element 38 is disposed within the threaded connection 25.
- Sealing element 38 is identical to the first sealing element 31 is formed, so in turn has a sealing ring made of PTFE, which in an annular groove 33 in
- Connector 26 rests. Again, a coating of one of the threads of the threaded connection 25 with a sealing layer is possible.
- Seal member 38 seals the leakage bore 37 against the interior of the
- the leakage bore 37 has the task, possibly occurring
- the leakage bore 38 allows leakage testing of the first seal member 31.
- a bellows 39 is pushed onto the valve needle 19, wherein one end of the bellows on the valve needle 19 and the other end of the bellows on the nozzle body 12 is fixed fluid-tight.
- the injector shown in longitudinal section in Figure 3 is modified in comparison with the injection valve described above in that the first seal member 31 is not designed as a radial seal, but as an axial seal.
- the Sacklochgrund formed with a relative to the blind hole diameter smaller diameter, so that at the transition from the blind hole 24 to the blind hole bottom of the mouth of the transverse bore 28 upstream annular shoulder 40 ( Figure 4) is present.
- an annular sealing washer 41 made of PTFE.
- inlet nozzle 23 carries an external thread, which is screwed into a cut into the through hole 34 in the connector 13 internal thread.
- the threaded connection between inlet connection 23 and connection piece 13 is marked 42 in FIG.
- Inlet nozzle 23 connected via a peripheral weld 43 with the connector 13.
- the weld 43 may be omitted if - as is done in the injection valve in Figure 1 - on the connector body 13 a the inlet nozzle 23 partially enclosing plastic body 36 is sprayed, as indicated in phantom in Figure 3. Otherwise, the injection valve according to FIG. 3 coincides with the injection valve shown in FIG. 1, so that identical components are provided with the same reference numerals.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009055362A DE102009055362A1 (de) | 2009-12-29 | 2009-12-29 | Einspritzventil für ein Fluid |
PCT/EP2010/067405 WO2011080002A1 (de) | 2009-12-29 | 2010-11-12 | Einspritzventil für eine fluid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2519730A1 true EP2519730A1 (de) | 2012-11-07 |
EP2519730B1 EP2519730B1 (de) | 2015-09-16 |
Family
ID=43569254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10779003.2A Not-in-force EP2519730B1 (de) | 2009-12-29 | 2010-11-12 | Einspritzventil für ein fluid |
Country Status (5)
Country | Link |
---|---|
US (1) | US8757512B2 (de) |
EP (1) | EP2519730B1 (de) |
CN (1) | CN102713237B (de) |
DE (1) | DE102009055362A1 (de) |
WO (1) | WO2011080002A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012204659A1 (de) * | 2012-03-22 | 2013-09-26 | Man Diesel & Turbo Se | Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage |
DE202012007128U1 (de) * | 2012-07-23 | 2012-08-02 | Robert Bosch Gmbh | Ventil zum Zumessen von Fluid |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19540155C2 (de) * | 1995-10-27 | 2000-07-13 | Daimler Chrysler Ag | Servoventil für eine Einspritzdüse |
DE19941930A1 (de) * | 1999-09-03 | 2001-03-15 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
JP4158338B2 (ja) * | 2000-06-06 | 2008-10-01 | 株式会社デンソー | インジェクタ用圧電体素子 |
DE10110678A1 (de) * | 2001-03-06 | 2002-10-02 | Siemens Ag | Dosiervorrichtung |
US6499471B2 (en) * | 2001-06-01 | 2002-12-31 | Siemens Automotive Corporation | Hydraulic compensator for a piezoelectrical fuel injector |
US6749127B2 (en) * | 2002-02-11 | 2004-06-15 | Siemens Vdo Automotive Corporation | Method of filling fluid in a thermal compensator |
DE10257895A1 (de) | 2002-12-11 | 2004-06-24 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE10319599A1 (de) | 2003-05-02 | 2004-11-18 | Robert Bosch Gmbh | Aktoreinheit für ein piezogesteuertes Kraftstoffeinspritzventil |
EP1561942B1 (de) * | 2004-01-29 | 2006-12-27 | Siemens VDO Automotive S.p.A. | Flüssigkeitseinspritzventil und sein Herstellungverfahren |
DE102007028490A1 (de) | 2007-06-21 | 2008-12-24 | Robert Bosch Gmbh | Koppler zur Hubübertragung mittels Scherkraft, Injektor, sowie Verfahren zur Hubübertragung |
-
2009
- 2009-12-29 DE DE102009055362A patent/DE102009055362A1/de not_active Withdrawn
-
2010
- 2010-11-12 WO PCT/EP2010/067405 patent/WO2011080002A1/de active Application Filing
- 2010-11-12 CN CN201080059938.0A patent/CN102713237B/zh not_active Expired - Fee Related
- 2010-11-12 EP EP10779003.2A patent/EP2519730B1/de not_active Not-in-force
- 2010-11-12 US US13/254,259 patent/US8757512B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011080002A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102713237A (zh) | 2012-10-03 |
EP2519730B1 (de) | 2015-09-16 |
US8757512B2 (en) | 2014-06-24 |
CN102713237B (zh) | 2015-05-20 |
DE102009055362A1 (de) | 2011-06-30 |
US20110309164A1 (en) | 2011-12-22 |
WO2011080002A1 (de) | 2011-07-07 |
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