EP2013468A1 - Injektor - Google Patents
InjektorInfo
- Publication number
- EP2013468A1 EP2013468A1 EP07726724A EP07726724A EP2013468A1 EP 2013468 A1 EP2013468 A1 EP 2013468A1 EP 07726724 A EP07726724 A EP 07726724A EP 07726724 A EP07726724 A EP 07726724A EP 2013468 A1 EP2013468 A1 EP 2013468A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- injector
- injector body
- contour
- sealing
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 57
- 239000000446 fuel Substances 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 230000003213 activating effect Effects 0.000 claims abstract 2
- 230000000977 initiatory effect Effects 0.000 claims 1
- 230000036316 preload Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 210000002435 tendon Anatomy 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
-
- 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
- F02M55/004—Joints; Sealings
Definitions
- the present invention relates to an injector for supplying fuel to an internal combustion engine, in particular in a motor vehicle, with the features of
- EP 1 174 615 A2 each comprise a piezoelectric actuator for controlling or actuating at least one nozzle needle, by means of which an injection of fuel under high pressure can be controlled by at least one injection hole.
- the piezoelectric actuator has a shaft which expands in its "energization” in its longitudinal direction and which resumes its original, shortened length in a "Entstromung".
- An injector body of the injector contains an actuator space in which the piezoelectric actuator is arranged with its shaft.
- a high-pressure path which leads the high-pressure fuel to the at least one spray hole, is felt through said actuator space. As a result, the piezoelectric actuator is under high pressure
- the piezoelectric actuator is arranged “wet” or “floating".
- a control piston can be driven by energizing and flowing out of the piezoelectric actuator in order to lower the pressure in a control chamber for opening the nozzle needle.
- This is a direct, pressure controlled Needle control.
- an inversely operated piezoelectric actuator it is discharged to open the nozzle needle, while it is energized when the nozzle needle is closed.
- the piezoelectric actuator directly to drive the nozzle needle or a needle assembly comprising the nozzle needle or, for example, to control a servo valve.
- other designs for injectors with piezoelectric actuator are conceivable.
- the injector according to the invention with the features of claim 1 has the advantage that the adjustability of the piezoelectric actuator relative to the injector body during assembly of the injector is improved via the interaction of a sealing contour formed on an actuator body with a sealing seat formed on the injector body. It is of particular importance that the sealing contour of the actuator base of the nozzle needle faces and sits axially in the direction of the nozzle needle in the sealing seat. In particular, this makes it possible to match the sealing contour and the sealing seat to one another such that the actuator foot, with its sealing contour in the sealing seat, forms an actuator space seal closing the actuator space. Depending on which axial force the sealing contour in the sealing seat sits, a more or less effective seal of the actuator space can be achieved to the outside.
- the sealing contour under preload in the sealing seat is present.
- the tightness of the actuator chamber seal can be adjusted to the particular desired pressure value.
- the biasing device can also be designed so that it is designed to initiate a bias that is so great that it leads to plastic deformation of the sealing seat and / or on the sealing contour. In such an embodiment, even the smallest form deviations can be compensated by the deformation in order to improve the effectiveness of the actuator chamber seal.
- FIG. 2 is an enlarged view in half section of a section II of Fig. 1,
- Fig. 3 is a further simplified representation in longitudinal section of an injector, but in another embodiment.
- an injector 1 of an injection device which is used to supply an internal combustion engine, in particular in a motor vehicle, with fuel - A -
- the injector 1 serves, an injector body 2, in which at least one nozzle needle 3 and a nozzle needle 3 comprehensive nozzle body 4 is arranged.
- the nozzle body 4 is fixed by means of an overspent nozzle retaining nut 46 on the rest of the injector body 2.
- the injector 1 comprises a piezoactuator 5 with an actuator foot 6, an actuator shaft 7 and an actuator head 8.
- the injector body 2 contains an actuator chamber 9 in which the piezoactuator 5 is arranged at least with its shaft 7.
- a high-pressure path 10 is also formed, which leads from a trained on the injector body 2 high-pressure port 11 of the injector 1 to at least one also formed on the nozzle body 4 injection hole 12 of the injector 1 and in operation of the injector 1 under high pressure fuel for at least one Spray hole 12 leads.
- the high pressure path 10 is guided through the actuator chamber 9, that is, the actuator chamber 9 forms part of the high pressure path 10 and is flowed through by the high pressure fuel.
- the piezoelectric actuator 5 is used to control or to actuate the nozzle needle 3, such that with the nozzle needle 3, the injection of high-pressure fuel through the at least one injection hole 12 in a respective injector 1 associated injection chamber 13 is controllable.
- the nozzle needle 3 cooperates with a needle seat 14 in a known manner.
- the pressure is lowered in a control chamber 16 by a corresponding actuation of the piezoelectric actuator 5.
- Said control chamber 16 is limited in the radial direction by a control sleeve 17.
- control chamber 16 In the axial direction of the control chamber 16 is limited to the nozzle needle 3 through an intermediate plate 18 and the piezoelectric actuator 5 through a control piston 19.
- the control piston 19 is firmly connected to the actuator head 8 and immersed in the control sleeve 17 a.
- the control sleeve 17 is mounted on the control piston 19 adjustable in stroke and supported by a closing compression spring 20 on the actuator head 8. About the closing pressure spring 20, the control sleeve 17 is axially biased against the intermediate plate 18.
- the piezoelectric actuator 5 may be operated inversely, for example. That is, in the initial state shown, in which the nozzle needle 3 is seated in the needle seat 14 and assumes its closed position, the piezoelectric actuator 5 is energized and is thus axially expanded. To open the nozzle needle 3, the piezoelectric actuator 5 is discharged, causing it to be parallel to the longitudinal axis 15 measured length reduced. Since the actuator foot 6 is fixedly arranged on the injector body 2, the actuator head 8 retracts from the nozzle needle 3 during the shortening of the actuator shaft 7. As a result, the control piston 19 is moved away from the nozzle needle 3, whereby the pressure in the control chamber 16 drops. As a result, the pressure-controlled nozzle needle 3 can lift off the needle seat 14 and the injection process begins.
- the actuator foot 6 has a sealing contour 21 which faces the nozzle needle 3 and bears against a sealing seat 22 which faces away from the nozzle needle 3 and at the injector body 2 is formed. This allows the actuator foot 6 in
- sealing contour 21 and sealing seat 22 are matched to one another such that the actuator foot 6 forms, together with its sealing contour 21 in the sealing seat 22, an actuator space seal 23 which closes the actuator space 9.
- sealing contour 21 and the sealing seat 22 are each designed annularly closed, wherein they rotate with respect to the longitudinal axis 15 in the circumferential direction. Furthermore, sealing contour 21 and sealing seat 22 are preferably concentric with the longitudinal axis
- the sealing contour 21 and the sealing seat 22 can also be utilized to align the piezoactuator 5 as exactly as possible concentrically with the longitudinal central axis 15 during assembly of the injector 1.
- the sealing contour 21 is designed spherical, such that the sealing contour 21 extends spherically along a spherical section.
- the associated virtual sphere is designated 24 in the figures.
- a center 25 of the ball 24 is arranged centrally in the actuator base 6.
- the spherical sealing contour 21 simplifies the axial alignment of the piezoelectric actuator 5 relative to
- the sealing seat 22 preferably has a conical shape, whereby a linear contact between sealing contour 21 and sealing seat 22 is achieved regardless of manufacturing tolerances. As a result, a closed and thus effective Aktorraumdichtung 23 is realized.
- the actuator foot 6 is prestressed in the direction of the nozzle needle 3, as a result of which the sealing contour 21 is seated with axial prestress in the sealing seat 22.
- the selected axial preload can be comparatively large, for example, the set preload can be so large that it comes to tolerated plastic deformation of the sealing seat 22 and / or on the sealing contour 21.
- the above-mentioned linear contact between sealing contour 21 and sealing seat 22 is thereby virtually strip-shaped.
- the injector 1 is equipped with a pretensioning device 26. At the shown
- the biasing means 26 comprises a clamping screw 27 and a clamping member 28, wherein it is also possible in principle, the here separately formed clamping member 28 integrally formed on the clamping screw 27 and to form the clamping member 28 by the clamping screw 27.
- the here separately formed clamping member 28 integrally formed on the clamping screw 27 and to form the clamping member 28 by the clamping screw 27.
- a clamping screw 27 and a clamping nut can be used instead of a clamping screw 27 and a clamping nut.
- the tendon 28 has a support seat 29 which faces the nozzle needle 3.
- a support contour 30 is formed on a side facing away from the nozzle needle 3, which abuts axially in the support seat 29 and is supported.
- the support contour 30 and the support seat 29 closed in an annular manner and preferably to arrange it concentrically with respect to the longitudinal axis 15.
- the support contour 30 then extends spherically in a spherical section.
- the support contour 30 associated ball may have a different radius than the sealing contour 21 associated ball.
- the balls of the two contours 21, 30 are the same size and are preferably identical. That is, in the example shown, the spherical support contour 30 is also on the virtual ball 24 with the center 25th
- the support seat 29 is preferably configured conical, whereby a linear contact is achieved between the support contour 30 and support seat 29. Depending on the biasing force, plastic deformation may also occur on the support seat 29 and / or on the support contour 30.
- the clamping screw 27 has an external thread 31 which cooperates with a complementary internal thread 32 which is formed on the injector body 2. Thus, the clamping screw 27 is axially screwed into the injector 2. The clamping screw 27 presses the clamping member 28 in the axial direction against the actuator base. 6
- the tendon 28 may be secured by means of a rotation lock 33 against a rotational adjustment about the longitudinal axis 15.
- the anti-rotation device 33 is formed by a locking pin 34 which is supported on the injector body 2 and engages radially in a securing slot 35 formed on the outside of the tensioning element 28.
- the tendon 28 is preferably annular, thereby including a central opening 36.
- the clamping screw 27 may be configured as sleeve-shaped here, whereby it has a central passage 37. Opening 36 and passage 37 form a connection channel 38, through which electrical connections 39 of the piezoelectric actuator 5 to the actuator foot 6 and through the actuator foot 6 are led through to the actuator shaft 7 equipped with the piezoelectric elements.
- the injector 1 according to the invention is characterized in particular by being
- Piezo actuator 5 during assembly can be aligned relatively exactly parallel to the axis of the longitudinal axis 15, which is achieved by the targeted shaping and the interaction of sealing contour 21 and sealing seat 22. Furthermore, with the help of the clamping member 28, which is secured against rotation on the injector body 2, the introduction of very high biasing forces on the clamping screw 27 allows, without causing it to a
- the injector 1 can be connected to a high-pressure source which provides the high-pressure fuel.
- the high pressure port 11 is connected to a high pressure line, which in turn is connected to a high pressure pump. If several injectors 1 is connected to a common high pressure line, it is a so-called
- the injector body 2 is made in one piece in the region containing the actuator chamber 9.
- the injector body 2 is at least made in two parts in the region encompassing the actuator chamber 9 or assembled from two parts, namely from a first injector body part 40 and from a second injector body part 41.
- the first injector body part 40 contains the actuator foot 6.
- the second injector body part 41 adjoins the first injector body part 40 in the direction of the nozzle needle 3.
- the second injector body part 41 contains the entire or at least a substantial proportion of the actuator chamber 9.
- the first injector body part 40 may contain a comparatively small proportion of the actuator chamber 9.
- the high-pressure port 11 is formed on the first injector body part 40.
- the two injector body parts 40, 41 are fastened to one another via a connecting element 42, which may be designed in particular sleeve-shaped.
- a connecting element 42 which may be designed in particular sleeve-shaped.
- an annular seal 44 is additionally provided here.
- the second injector body part 41 By means of the multi-part design of the injector body 2 shown in FIG. 3, it is possible, for example, to design the second injector body part 41 as a standard component, which is used identically in different variants of the injector 1.
- the first injector body part 40 can then be designed differently for different variants of the injector 1.
- different variants of the injector 1 can then be realized comparatively inexpensively.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006019308A DE102006019308A1 (de) | 2006-04-26 | 2006-04-26 | Injektor |
PCT/EP2007/052201 WO2007124971A1 (de) | 2006-04-26 | 2007-03-09 | Injektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2013468A1 true EP2013468A1 (de) | 2009-01-14 |
EP2013468B1 EP2013468B1 (de) | 2009-11-11 |
Family
ID=38093129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07726724A Not-in-force EP2013468B1 (de) | 2006-04-26 | 2007-03-09 | Injektor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090050114A1 (de) |
EP (1) | EP2013468B1 (de) |
AT (1) | ATE448401T1 (de) |
DE (2) | DE102006019308A1 (de) |
WO (1) | WO2007124971A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006019309B4 (de) * | 2006-04-26 | 2014-03-06 | Robert Bosch Gmbh | Injektor |
DE602008004091D1 (de) * | 2008-04-03 | 2011-02-03 | Continental Automotive Gmbh | Aktuatoranordnung und Einspritzventil |
JP5195451B2 (ja) * | 2008-04-15 | 2013-05-08 | 株式会社デンソー | 燃料噴射装置、それに用いられる蓄圧式燃料噴射装置システム |
DE102010034411B4 (de) | 2010-08-14 | 2018-10-11 | Audi Ag | Brennkraftmaschine mit Einspritzventil |
DE102011081176A1 (de) | 2011-08-18 | 2013-02-21 | Robert Bosch Gmbh | Ventil zum Zumessen eines strömenden Mediums |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19500706C2 (de) * | 1995-01-12 | 2003-09-25 | Bosch Gmbh Robert | Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen |
DE19519191C2 (de) * | 1995-05-24 | 1997-04-10 | Siemens Ag | Einspritzventil |
DE19742320A1 (de) * | 1997-09-25 | 1999-04-01 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
GB9922408D0 (en) * | 1999-09-23 | 1999-11-24 | Lucas Ind Plc | Fuel injector |
DE10040239B4 (de) * | 2000-08-17 | 2009-04-02 | Continental Automotive Gmbh | Geräuschgedämpfte Aktoreinheit |
DE10140799A1 (de) * | 2001-08-20 | 2003-03-06 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE10158789A1 (de) * | 2001-11-30 | 2003-07-10 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE10232193A1 (de) * | 2002-07-16 | 2004-02-05 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE102004002299A1 (de) * | 2004-01-16 | 2005-08-04 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkt angesteuertem Einspritzventilglied |
DE102004027824A1 (de) * | 2004-06-08 | 2006-01-05 | Robert Bosch Gmbh | Kraftstoffinjektor mit variabler Aktorübersetzung |
DE102004046888A1 (de) * | 2004-09-28 | 2006-03-30 | Robert Bosch Gmbh | Injektor zur Kraftstoffeinspritzung an einer Brennkraftmaschine |
US20070235554A1 (en) * | 2006-03-29 | 2007-10-11 | Williams Arthur R | Dual stroke injector using SMA |
-
2006
- 2006-04-26 DE DE102006019308A patent/DE102006019308A1/de not_active Withdrawn
-
2007
- 2007-03-09 DE DE502007001979T patent/DE502007001979D1/de active Active
- 2007-03-09 WO PCT/EP2007/052201 patent/WO2007124971A1/de active Application Filing
- 2007-03-09 EP EP07726724A patent/EP2013468B1/de not_active Not-in-force
- 2007-03-09 AT AT07726724T patent/ATE448401T1/de active
- 2007-03-09 US US12/295,829 patent/US20090050114A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2007124971A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090050114A1 (en) | 2009-02-26 |
DE102006019308A1 (de) | 2007-10-31 |
WO2007124971A1 (de) | 2007-11-08 |
ATE448401T1 (de) | 2009-11-15 |
EP2013468B1 (de) | 2009-11-11 |
DE502007001979D1 (de) | 2009-12-24 |
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