EP2670970A1 - Kraftstoffinjektor - Google Patents
KraftstoffinjektorInfo
- Publication number
- EP2670970A1 EP2670970A1 EP11807956.5A EP11807956A EP2670970A1 EP 2670970 A1 EP2670970 A1 EP 2670970A1 EP 11807956 A EP11807956 A EP 11807956A EP 2670970 A1 EP2670970 A1 EP 2670970A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupler
- nozzle needle
- fuel
- piston
- space
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
- F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions
Definitions
- the invention relates to a fuel injector according to the preamble of claim 1.
- a fuel injector is known from DE 10 2008 054 421 A1 of the Applicant.
- the well-known fuel
- the injector comprises a master piston connected to a piezo actuator which exchanges into a bore of a slave piston.
- the slave piston in turn is axially slidably movable in an injector.
- the unit formed from the master piston and the slave piston represents a first hydraulic coupler, which causes an opening of a voltage applied to a valve seat nozzle needle when energizing the piezoelectric actuator.
- the invention is based on the object, a fuel! Njektor according to the preamble of claim 1 such that both opening and closing forces are transmitted from the actuator to the nozzle needle and thus a fuel injector with a relatively simple or small-sized piezoelectric actuator can be achieved.
- a low pressure drop and thus the highest possible efficiency should be achieved.
- the invention is based on the idea, the fuel! njek- tor with two hydraulic couplers, of which one hydraulic coupler is responsible for opening the nozzle needle, while the other hydraulic coupler supports the closing process.
- the two hydraulic couplers have the same path ratio. This will be the same with respect to the opening stroke and the closing stroke
- the nozzle needle is connected to a Kopplerkolbenan instructs the nozzle needle to a Kopplerkolbenan instructs the nozzle needle.
- the coupler piston arrangement encompasses two coupler pistons abutting one another at a contact surface and that the two end faces of the coupler pistons facing away from the contact surface delimit the two coupler spaces is particularly preferred.
- Such a design or arrangement of the coupler pistons has the advantage that in the (simultaneous) loading Movement of the coupler piston no tension can occur in the coupler piston assembly, as they otherwise appear very easily due to positional tolerances of the components.
- such an arrangement allows the use of two coupler bodies, so that a constructively relatively simple structure can be realized.
- a connecting bore between two coupler spaces is designed as a throttle for influencing the movement of the nozzle needle.
- a preferred constructive development of the invention provides that a third coupler space is closed by a closure plate which is pressed by the spring force of a biasing spring against an end face of the coupler body.
- the nozzle needle formed in the high-pressure chamber a throttle device for influencing the movement of the nozzle needle.
- a throttle device for influencing the movement of the nozzle needle.
- an inventive injector 10 is shown, as it serves in particular as part of a so-called common-rail injection system for injecting fuel into a combustion chamber, not shown, of an internal combustion engine.
- the injector 10 has a multi-part design tes Injektorgepuruse 1 1 on.
- the injector housing 11 comprises by way of example on the side facing away from the combustion chamber of the internal combustion engine a housing cover 12 which is connected to a sleeve-shaped housing middle part 13.
- a first, plate-like coupler body 14 and a second, likewise plate-shaped coupler body 15 adjoin the housing middle part 13 in the axial direction of the injector housing 11.
- An injector base part 16 in turn adjoins the second coupler body 15 on the side opposite the first coupler body 14.
- a recess 17 is formed, which limits a high-pressure chamber 18 of the injector 10.
- the high-pressure chamber 18 is connected to a pressure source 20, in particular the so-called rail, by means of an inflow channel 19 formed by the two coupler bodies 14, 15, the middle section 13 and the housing cover 12.
- a sealing seat 23 which preferably closes a plurality of through-openings 24 in a closed position of the nozzle needle 22, is injected through the open nozzle needle 22 at high pressure fuel into the combustion chamber of the internal combustion engine.
- the nozzle needle 22 is guided in the recess 17 in a bearing body 25, wherein between the bearing body 25 and the nozzle needle 22, a flow connection is formed.
- the nozzle needle 22 has a throttle point 27 in the form of a throttle plate 28. By means of the throttle point 27 and the throttle plate 28, the movement of the nozzle needle 22 can additionally influence or control.
- the nozzle needle 22 also has a collar 30, on which a nozzle closing spring 31 is supported.
- the other side of the nozzle closing spring 31 is supported on the underside of the second coupler body 15.
- the nozzle needle 22 is connected to the shaft 32 of a connecting piston 33.
- the shaft 32 is slidably guided in a sealing sleeve 35, which bears tightly against the underside of the second coupling body 15 and thus the second coupler body 15 seals against the high pressure chamber 18 and separates from this.
- the sealing sleeve 35 At the end face of the second coupler body 15 facing the sealing sleeve 35, the latter has an annular space 36 in the region of the shank 32, which is connected via a drainage bore 37 to a recess 39 of the housing middle part 13. About the annular space 36 can on the sealing sleeve 35 einaddder, under
- the recess 39 forms a low-pressure region 40 of the injector 10, which is connected via a return bore 41 with a fuel return of the fuel injection system.
- an actuator for actuating the nozzle needle 22 in the form of a piezoelectric actuator 44 is arranged in the recess 39 of the injector 1 1, i. in the low-pressure region 40.
- the piezoelectric actuator 44 has connection cables 45, via which the piezoelectric actuator 44 can be electrically actuated.
- the design of the piezoactuator 44 is such that, when de-energized, it has its smallest length considered in the longitudinal direction of the injector 10 and expands when energized in the axial direction of the injector 10.
- first coupler body 14 is on the recess 39 side facing a cylindrically shaped guide bore 46 for a master piston
- the master piston 47 formed, which is part of a first hydraulic coupler.
- the master piston 47 is connected via a connecting rod 48 with a support plate 49 on which the piezoelectric actuator 44 is arranged.
- the guide bore 46 is sealed with a closure plate 52, wherein the end plate 52 has a passage bore 53 for the connecting rod 48.
- a biasing spring 55 is supported, on the one hand the end plate 52 against the associated end face of the first coupler body 14, and on the other hand, the support plate 48 together with the piezoelectric actuator 44 against the housing cover 12 with compressive force.
- the shaft 32 of the connecting piston 33 is operatively connected on the opposite side of the nozzle needle 22 with a slave piston 57.
- the slave piston 57 is slidably guided in a guide bore 58, which in the second Coupler body 15 is formed on the first body of the body 14 facing side.
- the first coupler body 14 in turn has a guide bore 59 with respect to the guide bore 58 of reduced diameter, wherein the two guide bores 58, 59 are aligned coaxially with each other.
- the guide bore 58 forms a first coupler space 61 on the side facing the nozzle needle 22 below the slave piston 57.
- the slave piston 57 is part of a coupler piston arrangement 62 of a second hydraulic coupler which, in addition to the slave piston 57, comprises a further coupler piston 63, which is slidably guided in the guide bore 59 and abuts against the end face of the slave piston 57 with its end face facing the slave piston 57.
- the further coupler piston 63 delimits on the side facing away from the slave piston 57 a second coupler space 65 formed by the guide bore 59.
- the second coupler space 65 is connected via a connecting channel 66 to a third coupler space 67, which is bounded by the guide bore 46, the end plate 52 and the top of the master piston 47.
- a fourth coupler space 69 is formed, which communicates with the first one via a connecting channel 71
- Coupler space 61 is coupled.
- the connecting channel 71 may in this case be designed to influence the speed of movement of the nozzle needle 22 as a throttle.
- a geometric configuration is preferred in which the area ratio between the fourth coupler space 69 and the first coupler space 61 is the same as the ratio between the third coupler space 67 and the second coupler space 65.
- the mode of operation of the injector 10 described so far is as follows: In the In the closed position of the nozzle needle 22 shown in FIG. 1, the piezoelectric actuator 44 is de-energized. For injecting fuel into the combustion chamber of the internal combustion engine, the nozzle needle 22 must lift off from its sealing seat 23 in order to release the passage openings 24. For this purpose, the piezoelectric actuator 44 is energized or charged.
- the energization of the piezoelectric actuator 44 has the consequence that this expands in the axial direction.
- the piezoelectric actuator 44 via the connecting rod 48 with the master piston 47 this is inserted against the spring force of the biasing spring 55 in the guide bore 46.
- fuel located in the fourth coupler space 69 is displaced via the connecting channel 71 into the first coupler space 61, so that an opening force is generated against the force of the nozzle closing spring 31 on the slave piston 57.
- fuel is displaced from the second coupler space 65 via the connecting channel 61 into the third coupler space 67.
- the piezoelectric actuator 44 is discharged. This reduces the length of the piezoelectric actuator 44, so that it is moved under spring force of the biasing spring 55 together with the support plate 49 in the direction of the housing cover 12.
- the support plate 49 takes on the connecting rod 48 with the master piston 47, so that from the third coupler space 67 fuel is displaced via the connecting channel 66 into the second coupler space 65.
- the rising in the second coupler space 65 fuel pressure causes movement of the coupler piston assembly 62 in the closing direction of the nozzle needle 22. In this case, 61 fuel is displaced from the first coupler space via the connecting channel 71 in the fourth coupler 69.
- the diameter of the piston 32 and the diameter of the sealing seat 23 are matched to one another such that the valve needle 22 is at least approximately force-balanced in its closed position. This means that the hydraulic forces on the valve needle 22 as seen in the direction of movement of the valve needle 22 cancel out completely or at least approximately and the valve needle 22 can be moved with relatively low forces and thus rapidly in the high-pressure chamber 18.
- the injector 10 described so far can be modified or modified in many ways without deviating from the idea of the invention.
- the second coupler body 15 and the sealing sleeve 35 can also be continuous, i. can be formed as a one-piece component. It can also be provided that only one of the coupler pistons 57, 63 is provided or that both coupler pistons 57, 63 form an integral component.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110003443 DE102011003443A1 (de) | 2011-02-01 | 2011-02-01 | Kraftstoffinjektor |
PCT/EP2011/074322 WO2012104000A1 (de) | 2011-02-01 | 2011-12-30 | Kraftstoffinjektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2670970A1 true EP2670970A1 (de) | 2013-12-11 |
EP2670970B1 EP2670970B1 (de) | 2017-05-31 |
Family
ID=45476503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11807956.5A Not-in-force EP2670970B1 (de) | 2011-02-01 | 2011-12-30 | Kraftstoffinjektor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2670970B1 (de) |
CN (1) | CN103339366B (de) |
DE (1) | DE102011003443A1 (de) |
WO (1) | WO2012104000A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012212614A1 (de) * | 2012-07-18 | 2014-01-23 | Continental Automotive Gmbh | Piezoinjektor mit hydraulisch gekoppelter Düsennadelbewegung |
DE102012222509A1 (de) | 2012-12-07 | 2014-06-12 | Continental Automotive Gmbh | Piezoinjektor |
DE102012223934B4 (de) | 2012-12-20 | 2015-10-15 | Continental Automotive Gmbh | Piezoinjektor |
DE102014206975A1 (de) | 2014-04-10 | 2015-10-15 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102014206969A1 (de) | 2014-04-10 | 2015-10-15 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102014206971A1 (de) | 2014-04-10 | 2015-10-15 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102014210101A1 (de) | 2014-05-27 | 2015-12-03 | Robert Bosch Gmbh | Kraftstoffinjektor |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004176656A (ja) * | 2002-11-28 | 2004-06-24 | Denso Corp | 燃料噴射弁 |
DE10333573B3 (de) * | 2003-07-24 | 2004-11-18 | Robert Bosch Gmbh | Kraftstoffeinspritzvorrichtung |
DE10333698A1 (de) * | 2003-07-24 | 2005-02-24 | Robert Bosch Gmbh | Kraftstoffeinspritzvorrichtung |
DE102006026400A1 (de) * | 2006-06-07 | 2007-12-13 | Robert Bosch Gmbh | Kraftstoffinjektor mit Servounterstützung |
EP1970556B1 (de) * | 2007-03-15 | 2009-12-30 | Ford Global Technologies, LLC | Injektor |
JP2009019565A (ja) * | 2007-07-11 | 2009-01-29 | Toyota Motor Corp | 燃料噴射装置 |
DE102007032741A1 (de) * | 2007-07-13 | 2009-01-15 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE102008054421A1 (de) | 2008-12-09 | 2010-06-10 | Robert Bosch Gmbh | Kraftstoffinjektor |
-
2011
- 2011-02-01 DE DE201110003443 patent/DE102011003443A1/de not_active Withdrawn
- 2011-12-30 CN CN201180066228.5A patent/CN103339366B/zh not_active Expired - Fee Related
- 2011-12-30 WO PCT/EP2011/074322 patent/WO2012104000A1/de active Application Filing
- 2011-12-30 EP EP11807956.5A patent/EP2670970B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2012104000A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN103339366B (zh) | 2016-11-09 |
WO2012104000A1 (de) | 2012-08-09 |
CN103339366A (zh) | 2013-10-02 |
DE102011003443A1 (de) | 2012-08-02 |
EP2670970B1 (de) | 2017-05-31 |
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