CN104769269A - Fuel injector comprising a piezoactuator - Google Patents
Fuel injector comprising a piezoactuator Download PDFInfo
- Publication number
- CN104769269A CN104769269A CN201380056149.5A CN201380056149A CN104769269A CN 104769269 A CN104769269 A CN 104769269A CN 201380056149 A CN201380056149 A CN 201380056149A CN 104769269 A CN104769269 A CN 104769269A
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- Prior art keywords
- coupler
- fuel injector
- cavity volume
- valve needle
- piston
- Prior art date
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- 239000000446 fuel Substances 0.000 title claims abstract description 56
- 230000008878 coupling Effects 0.000 claims abstract description 48
- 238000010168 coupling process Methods 0.000 claims abstract description 48
- 238000005859 coupling reaction Methods 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 42
- 238000003825 pressing Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 description 11
- 238000007493 shaping process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
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- 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
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- 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
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- 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
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- 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
- F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
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- 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
-
- 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
- F02M2200/708—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with hydraulic chambers formed by a movable sleeve
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a fuel injector for a fuel injection system, in particular a common rail injection system, comprising a nozzle needle (3) that is guided in a high-pressure bore (1) of the nozzle body (2) so as to be able to carry out a stroke movement, by means of which at least one injection opening can be released or closed, a piezoactuator (6), received in a low-pressure zone (5), for directly controlling the stroke movement of the nozzle needle (3), and a coupling mechanism (7) via which the piezoactuator (6) is hydraulically coupled to the nozzle needle (3). According to the invention, the coupling mechanism (7) comprises a coupling volume (8) which is formed inside a sleeve-shaped coupling piston (9), said coupling piston (9) being guided via an inner pin (10) that delimits the coupling volume (9) in an axial direction so as to be able to carry out a stroke movement, an end section (12) of the nozzle needle (3) extending into the coupling volume (8) or into a fuel volume connected to the coupling volume (8).
Description
Technical field
The present invention relates to a kind of fuel injector for fuel injection system, particularly common-rail injection system, it has the feature as described in the preamble of claim 1.
This fuel injector be included in the ground of stroke motion in the pressure hole of nozzle body directed for opening and closing at least one valve needle spraying opening, the piezoelectric actuator of the stroke motion for direct Control Nozzle pin received in area of low pressure and coupling device, described piezoelectric actuator hydraulically can be coupled with valve needle by described coupling device.
Background technique
A kind of fuel injector is learnt by DE 10 2,009 001 131 A1, it has the piezoelectric actuator of the stroke motion for direct Control Nozzle pin be arranged in the area of low pressure of sparger, in described fuel injector, valve needle is arranged on upper pressure balance ground to a great extent.For this reason, the end of the nozzle side of valve needle is arranged the protuberance of plunger type, described protuberance axially may move at the pilot hole be connected with firing chamber and directed hermetically.Piezoelectric actuator hydraulically may be coupled with valve needle by Coupler space.Realize described coupling in the following manner, namely when piezoelectric actuator galvanization, valve needle occupies its closed position, and in order to open the electric current that must interrupt piezoelectric actuator.That is, actuator is charged at relatively long injection interval, and only in relatively short injection period electric discharge (so-called multi channel).Therefore, actuator piezoelectric constant with its when non-multi channel compared with operationally between period for longer periods stand strong electrical field.Therefore the working life of actuator may be shortened significantly.
Summary of the invention
Therefore, the object of the invention is to, provide a kind of fuel injector, it has the piezoelectric actuator for the directly stroke motion of Control Nozzle pin, and described fuel injector is durable.Particularly will provide a kind of fuel injector with piezoelectric actuator, described piezoelectric actuator does not drive controlled nozzle pin inversely.
This object is realized by the fuel injector with feature according to claim 1.Favourable further scheme of the present invention can draw by dependent claims.
Described fuel injector to be included in the pressure hole of nozzle body can stroke motion ground directed for opening and closing at least one valve needle spraying opening, the piezoelectric actuator of the stroke motion for direct Control Nozzle pin received in area of low pressure and coupling device, described piezoelectric actuator hydraulically can be coupled with valve needle by described coupling device.According to the present invention, coupling device comprises Coupler cavity volume, and described Coupler cavity volume is configured in the inside of sleeve-shaped Coupler piston.At this, Coupler piston can be guided by the inner pin axially limiting the border of Coupler cavity volume stroke motion.In addition, during the end portion section of valve needle is inserted in Coupler cavity volume or inserted the fuel cavity volume that is hydraulically connected with Coupler cavity volume, thus the axial force along closing direction effect is applied to the end face of the described end portion section of valve needle by the pressure in Coupler cavity volume.Achieved by the guide portion with little gap and hydraulically separate between the part be connected with Coupler cavity volume of valve needle and the part of being surrounded by the fuel be under high pressure of the bottom of valve needle.Described guide portion is directly arranged in the base member of Coupler piston or is arranged in seal sleeve, and described seal sleeve is arranged in below Coupler piston.Coupling device achieves directly Control Nozzle pin, and in described direct control, the elongation of actuator impels valve needle to open.In order to make valve needle lift from its sealing seat, sleeve-shaped Coupler piston moves relative to the direction of inner pin towards the sealing seat of valve needle, thus Coupler cavity volume increases.The pressure in Coupler cavity volume thereupon occurred reduces to cause, and valve needle enters in Coupler cavity volume or enters the fuel cavity volume above end portion section that be connected with Coupler cavity volume, that be arranged in valve needle.At this, valve needle lifts from its sealing seat.Therefore, commutation is caused by coupling device.That is, only when spraying, then piezoelectric actuator must be charged.At injection interval, piezoelectric actuator discharges.Therefore, so reduce the load of piezoelectric actuator, improve to make the working life of actuator.In addition, contribute to this, piezoelectric actuator is arranged in the area of low pressure of fuel injector, and that is, described piezoelectric actuator is without undergoing the loading by high pressure.This additionally achieves, and actuator is encapsulated in the actuator module of being surrounded by metal sleeve, and therefore reliably and fully avoids the contact between fuel and actuator.If use this possibility, so must substitute actuator in the correct way and actuator module is discussed.But, because described difference is unessential within the scope of the invention, so below term " actuator " is also used as the synonym for " actuator module ".In addition, described coupling device is constructed simply and is only needed little structure space.
Preferably, Coupler piston is loaded by the elastic force of pressure spring, and described pressure spring to be supported on the one hand on Coupler piston and to be supported in case side on the other hand.When terminating to piezoelectric actuator energising and described piezoelectric actuator shrinks, the elastic force of pressure spring towards piezoelectric actuator direction extruding Coupler piston and impel the reposition of Coupler piston by this way.In addition, the elastic force of pressure spring in state of rest for making actuator pretension with the compressive stress of machinery.Therefore avoid, at least the part of actuator pottery is operationally subjected to tensile stress, and this can cause damaging actuator.Especially, there is described danger when the beginning of discharge process after mainly the direct charging process at actuator terminates and directly.
In addition, in order to transmitting force, preferably between piezoelectric actuator and coupling device, power transmission part is furnished with.Described power transmission part preferably includes the pin shape portion's section through pressing plate and the plate-like portion section for axially supporting sleeve tubular Coupler piston.The pressing plate passed by the pin shape portion section of power transmission part is preferably used for the area of low pressure of fuel injector and high-pressure area to separate.Therefore preferably, the diameter of the pin shape portion section of power transmission part is chosen as little as far as possible and/or is arranged in pressing plate and is chosen as narrow as far as possible for the guiding clearance in the hole receiving pin shape portion section.Alternatively or addedly, the pin shape portion section of power transmission part can be surrounded by seal sleeve in high-pressure area, and described seal sleeve is supported on pressing plate preferably by undercut.Meanwhile, if the guiding clearance in pressing plate is designed to large, so described configuration achieves the power transmission part comprising seal sleeve and radially moves and therefore achieve the possible journal offset of compensation in direction.In addition, area of low pressure is produced relative to the extraordinary sealing in high-pressure area by seal sleeve.
According to of the present invention one preferred embodiment, inner pin and coupler board construct integratedly.
Interchangeablely preferred embodiment to arrange according to one of the present invention, inner pin can swingingly and/or can radially be bearing in the hole of coupler board in direction movably.At this, coupler board is used as other housing parts and can be such as axially connected with aforesaid pressing plate.Move to realize radially direction, the hole of coupler board must be provided with enough gaps, and inner pin is received in the hole.In addition, preferably formation level in inner pin or spherical shaping supporting surface, inner pin is supported in coupler board by described supporting surface.Such as there is in inner pin plane or spherical shaping supporting surface the lug area in side, inner pin can movably and/or can swingingly be supported by described supporting surface.
Radially move to realize inner pin, the supporting surface be configured in inner pin be preferably configured to plane and on the supporting surface constructed with being supported on the inversion symmetry of coupler board.In order to swingingly support inner pin, the supporting surface of described inner pin preferably has spherical shaping supporting surface, and inner pin is supported on the plane earth of Coupler, conical ground or supporting surface shaping spherically by described supporting surface.But alternatively or additionally, also central ring can be inserted between inner pin and coupler board, described central ring advantageously achieves inner pin and not only swings relative to coupler board but also radially move.
Preferably, coupler board has at least one other dead slot being used as input hole and/or break-through opening.Dead slot as input hole preferably laterally arrange and continue to extend in construct in holder and the input hole laterally arranged.Input hole can be configured to extend internally slightly obliquely, is connected with the pressure hole in nozzle body to make the input hole of holder.In addition, at least one other dead slot is set to for sleeve-shaped Coupler piston or the break-through opening of force transmission element for being connected integratedly with Coupler piston.This force transmission element such as can be configured to pin shape, and is relative to each other arranged in equal angular distance in the extending portion of the axis of Coupler piston.Substitute the element of pin shape, the wall segment of the part circular of Coupler piston also can be used as force transmission element.The dead slot of coupler board preferably matches with the cross section of force transmission element.But, must guarantee that Coupler piston keeps moving in the axial direction at this.
In addition propose, inner pin is loaded by the elastic force of pressure spring, and described pressure spring to be supported in coupler board and on the convex shoulder that extends of the radial direction being supported on inner pin on the other hand on the one hand.When inner pin can swingingly and/or when can arrange with moving radially, this is particularly suitable for.If in order to supported spring, the radial convex shoulder extended is to inner radial orientation in inner pin, and so spring can be configured to conical and act on the end that it narrows in the groove for this reason constructed in inner pin.But this outer spring also can be configured to columniform and be supported on the radial convex shoulder extended, and described convex shoulder radius vector extends outward.For this reason, such as a sleeve can be pressed in inner pin.Even if when the dynamic overpressure peak occurred in Coupler cavity volume in closing process makes to extrude inner pin towards the direction of piezoelectric actuator, the elastic force of spring also keeps inner pin to contact with coupler board.
In addition, valve needle is preferably also loaded by the elastic force of pressure spring, and wherein, described pressure spring to be directly bearing on the one hand on Coupler piston or to be supported on Coupler piston indirectly by seal sleeve and to be supported on valve needle on the other hand.
In addition, valve needle end portion section can in the hole directly in the region of the base member of Coupler piston stroke motion ground directed.
Of the present invention another preferred embodiment in, end portion section stroke motion ground in seal sleeve of valve needle is directed, described seal sleeve is loaded towards the direction of Coupler piston by the elastic force of pressure spring, and is preferably arranged in the below of Coupler piston.In addition, seal sleeve is preferably arranged between Coupler piston and pressure spring, thus seal sleeve keeps the end contact with the bottom of Coupler piston by the elastic force of pressure spring.Preferably, the end portion section of seal sleeve, valve needle and Coupler piston limit the border of fuel cavity volume, and described fuel cavity volume is connected with Coupler cavity volume.Described connection can realize in the following manner, namely insert in Coupler cavity volume through the hole in the base member of Coupler piston above the guide portion of the end portion Duan Qi of valve needle in seal sleeve, and there is large diametric clearance between hole in the base member of Coupler piston and the end portion section of valve needle.Another possibility that the fuel cavity volume surrounded by seal sleeve is connected with Coupler cavity volume is, valve needle is only configured to so long, with the region making the upper-end surface of its end portion section be arranged in the seal sleeve below the lower end surface of Coupler piston, and be connected with that surrounded by Coupler piston and inner pin, initial Coupler cavity volume by the passage in the base member of Coupler piston with the cavity volume of the lower end surface limited boundary of Coupler piston by the end portion section of seal sleeve, valve needle.At this, described passage is preferably configured to hole, and wherein, its diameter now can be less than the diameter of the end portion section of valve needle.In the further scheme of described mode of execution, described channels configuration is throttle position.Passage overcomes as the described structure of throttle position and inspire hydraulic vibration and/or mechanical vibration in the region of valve needle.
Valve needle can be directed in seal sleeve described mode of execution can compensate journal offset tolerance between Coupler piston and valve needle, wherein, simultaneously by the guiding clearance between seal sleeve and valve needle relative to high-pressure area sealed coupler cavity volume.
In these supplementary notes, coupling device is essential safe type.Because in case of a fault, such as when cursorily long-time charge to actuator, Coupler cavity volume is little by little full of, and therefore causes shut-off nozzle pin.The high pressure cavity volume surrounding coupling device can be used as additional pressure reservoir (so-called " Minirail (miniature rail) ") equally.
In addition preferably, the throttle position determined is arranged in the flow area between valve needle and pressure hole, thus the power of closing under the state of opening acts on valve needle all the time.Because when nozzle is opened, then the pressure on nozzle carrier is always slightly less than the pressure in the region of coupling device due to throttle position.In addition, described throttle position overcomes or the hydraulic vibration of damping in the region of valve needle and mechanical vibration.In addition, the pressure increase exceeding system pressure in Coupler cavity volume is overcome in this way.
Advantageously, power transmission part is loaded by the elastic force of pressure spring, and described pressure spring directly or indirectly by seal sleeve is supported on pressing plate on the one hand, and is supported in the plate-like portion section of power transmission part on the other hand.In the layout of seal sleeve around the pin shape portion section of power transmission part, pressure spring keeps seal sleeve to contact with pressing plate.Realize optimum sealing in this way.In addition, between power transmission part and pressing plate, formation is measured as enough large guiding clearance simultaneously, the layout of seal sleeve achieves power transmission part and radially can move relative to pressing plate.Therefore possible journal offset can be compensated equally by described layout.
Propose as further step, between power transmission part and piezoelectric actuator, arrange adjusting element.The height of Coupler cavity volume can be affected by the height of adjusting element.In addition, by adjusting element, actuator force is delivered evenly on power transmission part.Alternatively, described adjusting element also can be arranged between power transmission part and Coupler piston.
In addition propose, be furnished with sleeve-shaped housing parts between coupler board and nozzle body, described housing parts receives coupling device at least in part.Therefore, sleeve-shaped housing parts is loaded by high pressure, and described high pressure surrounds coupling device.According to the size of pressure chamber being configured in sleeve-shaped housing parts inside, described pressure chamber can be used as so-called " miniature rail ".
Fuel injector according to the present invention has the advantage in high working life.Because piezoelectric actuator is arranged in area of low pressure on the one hand, the Coupler that can be reversed by direction is on the other hand coupled with valve needle, thus when spraying, only charges to piezoelectric actuator.In contrast to this, at injection interval, piezoelectric actuator discharges.In order to realize the coupling device that setting direction reverses, constructing simply and only needing few structure space.Because coupling device is arranged in high-pressure area, wherein, the fuel be under high pressure surrounds coupling device, and the guiding clearance overcome in the guiding area of coupling device expands.Therefore, decrease Coupler in addition to leak with pressure and temperature about the impact of ground on function.In addition, can realize compensating possible journal offset by means of simple measure.
Manufacture prerequisite in other words as required, can select between the structure of the one of all parts, such as valve needle, Coupler piston, power transmission part and the structure of modular type.That is, when such as having advantage for manufacture or installation, these components can be divided into multiple component on arbitrary position.Force transmission element such as through coupler board can construct integratedly with Coupler piston or construct integratedly with power transmission part.In addition, described force transmission element can exist as independent component.
Piezoelectric actuator received in the area of low pressure of holder can as packed as shown in following accompanying drawing, or alternatively sealed relative to the fuel be under low pressure filling up actuator chamber by means of diaphragm, wherein preferably, described diaphragm seal ground embeds between actuator head and the inwall of holder.In addition, preferably intermediate space between actuator and holder can be filled up, to make heat radiation reach optimum degree with the filler of heat conduction.
Accompanying drawing explanation
Explain preferred embodiment of the present invention with reference to the accompanying drawings below.In accompanying drawing:
Fig. 1 illustrates the partial longitudinal section figure dissected according to fuel injector of the present invention,
Fig. 2 illustrates the Local map of the amplification in the region of coupling device of Fig. 1,
Fig. 3 illustrates the cross-sectional view of the fuel injector of the Fig. 1 that to dissect in the region of coupler board,
Fig. 4 illustrates the fuel injector in enable possition, namely when piezoelectric actuator charges of Fig. 1,
Fig. 5 illustrates another longitudinal section according to the power transmission part of fuel injector of the present invention of dissecting,
Fig. 6 a illustrates another partial longitudinal section figure according to the coupling device of fuel injector of the present invention that dissects,
Fig. 6 b illustrates the partial longitudinal section figure of coupling device of dissecting, and described coupling device is for according to the interchangeable mode of execution of the coupling device of Fig. 6 a,
Fig. 7 a-c illustrates and to dissect according to the corresponding longitudinal section of the coupling device of fuel injector of the present invention in the region of inner pin, and
Fig. 8 a-c illustrates and to dissect according to the corresponding longitudinal section of the coupling device of fuel injector of the present invention in the region of inner pin.
Embodiment
The longitudinal section of Fig. 1 show in a closed position according to fuel injector of the present invention.Show piezoelectric actuator 6 received in the holder 4 of fuel injector, described piezoelectric actuator is supported on power transmission part 14 by adjusting element 30.Power transmission part 14 has pin shape portion section 16, and described power transmission part, contacts with adjusting element 30 to reach through pressing plate 15 with described pin shape portion section.Power transmission part 14 has plate-like portion section 17 on the end that it is other, and described portion section and coupling device 7 interact.The diameter of pin shape portion section 16 is chosen as the diameter being significantly less than plate-like portion section, and meanwhile, the hole of the reception pin shape portion section 16 of pressing plate 15 has narrow guiding clearance.Therefore achieve the sealing between the area of low pressure 5 receiving piezoelectric actuator 6 and the high-pressure area 18 receiving coupling device 7, and protect piezoelectric actuator 6 from affected by high.Coupling device 7 comprises sleeve-shaped Coupler piston 9, at the Inner Constitution Coupler cavity volume 8 of described Coupler piston.Coupler piston 9 can be axially movably directed by inner pin 10, thus can change Coupler cavity volume 8 by axially moving Coupler piston 9.In the base member 11 opposed with inner pin 10 of Coupler piston 9, construct a hole, the end portion section 12 of valve needle 3 can axially movably be received in the hole.If be energized to piezoelectric actuator 6 and extend at this, so described piezoelectric actuator is towards the direction squeeze adjustments part 30 of the sealing seat (not shown) of valve needle 3 and the power transmission part 14 that reclines thereon.At this, power transmission part 14 makes the elastic force of sleeve-shaped Coupler piston 9 renitency spring 13 move towards the direction of sealing seat.At this, Coupler cavity volume 8 increases, and this causes the pressure in Coupler cavity volume 8 to reduce and the elastic force of valve needle 3 renitency spring 25 is unlocked.If terminated to the energising of piezoelectric actuator 6, so described piezoelectric actuator shrinks again, and wherein, pressure spring 13 makes Coupler piston 9 and power transmission part 14 be returned in corresponding initial position.Coupler cavity volume 8 diminishes and pressure in Coupler cavity volume 8 raises, and the elastic force of pressure spring 25 causes valve needle 3 to be returned in its sealing seat.For this reason, be arranged in the pressure hole 1 of nozzle body 2 valve needle 3 stroke motion.Figure 4 illustrates the fuel injector in enable possition.
The partial illustration of the amplification of Fig. 2 goes out the fuel injector in the region of coupling device 7 of Fig. 1.Show the end portion section 12 of sleeve-shaped Coupler piston 9, inner pin 10 and valve needle 3, described end portion section is directed in the base member 11 of Coupler piston 9.Valve needle 3 is hydraulically coupled with piezoelectric actuator 6 by Coupler cavity volume 8.For this reason, the pressure that can change Coupler cavity volume 8 by axially moving Coupler piston 9 and produce in Coupler cavity volume 8, wherein, realizes axially moving Coupler piston 9 by piezoelectric actuator 6.The power (black arrow see in Fig. 2) of piezoelectric actuator 6 is towards the direction extruding Coupler piston 9 of the sealing seat of valve needle 3, and therefore, the pressure in Coupler cavity volume 8 reduces and the force direction that valve needle 3 is in reverse to piezoelectric actuator 6 is opened.Therefore, realize direction by the coupling device 7 shown in Fig. 2 and reverse, described direction is reversed and is caused the valve needle 3 when piezoelectric actuator 6 elongates to move to piezoelectric actuator 6.
Fig. 3 illustrates the cross section of the sparger of the Fig. 1 that dissects, and wherein, is provided with the cross section of coupler board 20 of dissecting.The diameter region of inner pin 10 is shown in figure 3 respectively, and described inner pin here constructs integratedly with coupler board 20.The described diameter region of inner pin 10 is surrounded by dead slot, and wherein, the dead slot 22 of two kidney shapes is used as the break-through opening of the force transmission element 33 of Coupler piston 9, and the dead slot laterally arranged is used as input hole 21.In interchangeable mode of execution of the present invention, inner pin 10 also can be configured to independent component and be received in the hole 19 of coupler board.At this, the supporting of inner pin 10 in the hole 19 of coupler board 20 can differently construct.For this reason, specific embodiment can draw from Fig. 7 a-c and 8a-c.
Fig. 7 a-c illustrates following mode of execution, can compensate possible journal offset by means of described mode of execution.For this reason, inner pin 10 can move radially (see Fig. 7 a) or can swingingly (see Fig. 7 b) be bearing in the hole 19 of coupler board 20.Achieve radial mobility by the supporting surface of the plane in inner pin 10 and coupler board 20, and spherical shaping supporting surface (see Fig. 7 b) ensure that the swingable property of inner pin 10.The combination of two kinds of degrees of freedom can by realizing according to the mode of execution of Fig. 7 c, and in said embodiment, central ring 32 is arranged between inner pin 10 and coupler board 20.Central ring 32 not only achieves inner pin 10 to central ring 32 and radially moves relative to coupling plate 20 thus, and achieves central ring 32 and inner pin 10 swings relative to coupling plate 20 thus.
In addition corresponding to Fig. 8 a-c, inner pin 10 is loaded by the elastic force of pressure spring 23, and the convex shoulder 24 that described pressure spring is supported on the radial direction of inner pin 10 is on the one hand supported in coupler board 20 on the other hand.Because the convex shoulder of radial direction 24 radius vector extends inward, pressure spring 23 is shaped conically.But this is not that pressure is required, because the radial convex shoulder 24 extended also can radius vector extend outward, thus columniform spring 23 also can be used.
Fig. 5 illustrates an interchangeable mode of execution according to fuel injector of the present invention, and in described fuel injector, power transmission part 14 is surrounded by seal sleeve 29 in its pin shape portion section 16.Seal sleeve 29 is supported on pressing plate 15 and by the elastic force of pressure spring 28 and keeps contacting with pressing plate 15.For this reason, pressure spring 28 1 aspect is supported on seal sleeve 29, and is supported in the plate-like portion section 17 of power transmission part 14 on the other hand.And the hole of the pin shape portion section 16 of the reception transferring member 14 of pressing plate 15 has larger guiding clearance, thus for compensating the object of possible journal offset, power transmission part 14 can radially move.Meanwhile, the sealing of area of low pressure 5 relative to high-pressure area 18 is achieved by seal sleeve 29.Except carrying out except possible compensation to journal offset, other advantages that described mode of execution has are, the pressure produced in high-pressure area 18 achieves the guiding clearance reduced between seal sleeve 29 and power transmission part 14.Overcome the inevitable increase of the leakage usually when high pressure raises on the guide portion of power transmission part 14 in pressing plate 15 in this way.
In addition, a kind of comparable layout can arrange as shown in FIG. 6 a and be used for Coupler cavity volume 8 is sealed relative to high-pressure area 18, and wherein, seal sleeve 26 surrounds the end portion section 12 of valve needle 3.In hole, at this, the described hole of end portion section 12 of fanging noz(zle) pin 3 can also be provided with enough guiding clearances, thus by radially moving nozzle pin 3 and seal sleeve 26 can compensate possible journal offset.Seal sleeve 26 again by pressure spring 25 relative to Coupler piston 9 by axially pretension, wherein, the convex shoulder 27 that the radial direction that pressure spring 25 1 aspect is supported on valve needle 3 extends is supported on seal sleeve 26 on the other hand.
Fig. 6 b illustrates the further scheme of the mode of execution shown in Fig. 6 a.At this, so the end portion section 12 directed in seal sleeve 26 of structure valve needle 3, has been arranged in seal sleeve 26 to make its upper-end surface, has namely been arranged in the below of the lower end surface of Coupler piston 9.Therefore the diameter in the hole in the base member 11 of Coupler piston 9 can be reduced significantly.That is, described hole now need not fanging noz(zle) pin 3 again, but only also must in the Coupler cavity volume 8 of reality or the connection of setting up hydraulic pressure between coupler section cavity volume A and coupler section cavity volume B, described Coupler cavity volume 8 in other words coupler section cavity volume A is formed between Coupler piston 9 and inner pin 10, and described coupler section cavity volume B is formed in the inside of seal sleeve 26.Particularly advantageously, the hole in the base member 11 of Coupler piston 9 is configured to throttle position.In the described situation, when Coupler piston 9 and/or valve needle 3 move at every turn, described hole produces Pressure Drop, described Pressure Drop is applicable to hydraulic vibration in the region of damping valve needle 3 and/or mechanical vibration.
In addition, the hole in the base member 11 of Coupler piston 9 independently can also be configured to the passage with non-circular cross section with the end portion section 12 of its whether fanging noz(zle) pin 3.
The high pressure surrounding coupling device 7 can be used as additional pressure reservoir or be used as so-called " Minirail (miniature rail) ".In order to construct pressure reservoir, as previously mentioned, coupling device 7 is surrounded by sleeve-shaped housing parts 21, and described housing parts is arranged between coupler board 20 and nozzle body 2.All housing parts, particularly holder 4, pressing plate 15, coupler board 20, housing parts 31 and nozzle body 2 axially can be fixed by locking nut (not shown) relative to each other.Therefore, achieve described housing parts to seal relative to each other.
Claims (12)
1. one kind for fuel injection system, the particularly fuel injector of common-rail injection system, it comprises the valve needle (3) for opening and closing at least one injection opening that can be directed on stroke motion ground in the pressure hole of nozzle body (2) (1), be received in the piezoelectric actuator (6) of the stroke motion for directly controlling described valve needle (3) in area of low pressure (5), and coupling device (7), described piezoelectric actuator (6) hydraulically can be coupled with described valve needle (3) by described coupling device, it is characterized in that, described coupling device (7) comprises Coupler cavity volume (8), described Coupler cavity volume is configured in the inside of sleeve-shaped Coupler piston (9), wherein, described Coupler piston (9) by axially to limit the border of described Coupler cavity volume (8) inner pin (10) can stroke motion ground directed, during the end portion section (12) of described valve needle (3) extend in described Coupler cavity volume (8) or extend into the fuel cavity volume that is connected with described Coupler cavity volume (8).
2. fuel injector according to claim 1, it is characterized in that, described Coupler piston (9) is loaded by the elastic force of pressure spring (13), and described pressure spring is supported on described Coupler piston (9) on the one hand and goes up and supported in case side on the other hand.
3. fuel injector according to claim 1 and 2, it is characterized in that, power transmission part (14) is furnished with between described piezoelectric actuator (6) and described coupling device (7), described power transmission part preferably includes through pin shape portion section (16) of pressing plate (15) and plate-like portion section (17) for axially supporting described sleeve-shaped Coupler piston (9), preferably, the area of low pressure (5) of described fuel injector and high-pressure area (18) are separated by described pressing plate (14).
4. according to fuel injector in any one of the preceding claims wherein, it is characterized in that, described inner pin (10) and coupler board (20) construct integratedly.
5. fuel injector according to any one of claim 1 to 3, is characterized in that, described inner pin (10) can swingingly and/or can radially be bearing in the hole (19) of coupler board (20) in direction movably.
6. fuel injector according to claim 5, is characterized in that, described coupler board (20) has at least one other dead slot being used as input hole (21) and/or being used as break-through opening (22).
7. the fuel injector according to claim 5 or 6, it is characterized in that, described inner pin (10) is loaded by the elastic force of pressure spring (23), and described pressure spring is supported on described coupler board (20) on the one hand and goes up and be supported on the other hand on the convex shoulder (24) of radial direction extension of described inner pin (10).
8. according to fuel injector in any one of the preceding claims wherein, it is characterized in that, the Kong Zhongke stroke motion ground of end portion section (12) in base member (11) region of described Coupler piston (9) of described valve needle (3) is directed.
9. fuel injector according to any one of claim 1 to 7, it is characterized in that, the end portion section (12) of described valve needle (3) in seal sleeve (26) can stroke motion ground directed, described seal sleeve is loaded towards the direction of described Coupler piston (9) by the elastic force of pressure spring (25), preferably, the border of fuel cavity volume that is connected with described Coupler cavity volume (8) with the restriction of described Coupler piston (9) of the described end portion section (12) of described seal sleeve (26), described valve needle (3).
10. the fuel injector according to any one of claim 3 to 9, it is characterized in that, described power transmission part (14) is loaded by the elastic force of pressure spring (28), and described pressure spring is directly or indirectly supported on described pressing plate (15) by seal sleeve (29) on the one hand and goes up and be supported in plate-like portion section (17) of described power transmission part (14) on the other hand.
11. fuel injectors according to any one of claim 3 to 10, it is characterized in that, between described power transmission part (14) and described piezoelectric actuator (6) or between described power transmission part (14) and described Coupler piston (9), be furnished with adjusting element (30).
12. fuel injectors according to any one of claim 4 to 11, it is characterized in that, between described coupler board (20) and described nozzle body (2), be furnished with sleeve-shaped housing parts (31), described sleeve-shaped housing parts receives described coupling device (7) at least in part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012219867.9A DE102012219867A1 (en) | 2012-10-30 | 2012-10-30 | Fuel injector with piezo actuator |
| DE102012219867.9 | 2012-10-30 | ||
| PCT/EP2013/070073 WO2014067720A1 (en) | 2012-10-30 | 2013-09-26 | Fuel injector comprising a piezoactuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104769269A true CN104769269A (en) | 2015-07-08 |
| CN104769269B CN104769269B (en) | 2018-01-19 |
Family
ID=49274632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380056149.5A Active CN104769269B (en) | 2012-10-30 | 2013-09-26 | Fuel injector with piezoelectric actuator |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2914838B1 (en) |
| CN (1) | CN104769269B (en) |
| DE (1) | DE102012219867A1 (en) |
| WO (1) | WO2014067720A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106870230A (en) * | 2017-01-06 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of common-rail injector |
| CN108138716A (en) * | 2015-10-14 | 2018-06-08 | 大陆汽车有限公司 | For the piezoelectric injector of fuel injection |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201415539D0 (en) * | 2014-09-03 | 2014-10-15 | Delphi International Operations Luxembourg S.�.R.L. | Fuel injector |
| DE102015224554A1 (en) | 2015-12-08 | 2017-06-08 | Robert Bosch Gmbh | Dosing device for an electrically insulating medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1854991A1 (en) * | 2006-05-09 | 2007-11-14 | Robert Bosch Gmbh | Fuel injector with directly actuated injection needle |
| JP2010019147A (en) * | 2008-07-09 | 2010-01-28 | Nippon Soken Inc | Fuel injection valve |
| JP2010223195A (en) * | 2009-03-25 | 2010-10-07 | Denso Corp | Fuel injection valve |
| CN102251894A (en) * | 2010-05-19 | 2011-11-23 | 罗伯特·博世有限公司 | Fuel injector with hydraulic coupling unit |
| CN102782302A (en) * | 2010-02-24 | 2012-11-14 | 罗伯特·博世有限公司 | Fuel injector and method for the manufacture and/or assembly of a nozzle needle assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009001131A1 (en) | 2008-12-09 | 2010-06-10 | Robert Bosch Gmbh | fuel injector |
-
2012
- 2012-10-30 DE DE102012219867.9A patent/DE102012219867A1/en not_active Withdrawn
-
2013
- 2013-09-26 CN CN201380056149.5A patent/CN104769269B/en active Active
- 2013-09-26 EP EP13770891.3A patent/EP2914838B1/en not_active Not-in-force
- 2013-09-26 WO PCT/EP2013/070073 patent/WO2014067720A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1854991A1 (en) * | 2006-05-09 | 2007-11-14 | Robert Bosch Gmbh | Fuel injector with directly actuated injection needle |
| JP2010019147A (en) * | 2008-07-09 | 2010-01-28 | Nippon Soken Inc | Fuel injection valve |
| JP2010223195A (en) * | 2009-03-25 | 2010-10-07 | Denso Corp | Fuel injection valve |
| CN102782302A (en) * | 2010-02-24 | 2012-11-14 | 罗伯特·博世有限公司 | Fuel injector and method for the manufacture and/or assembly of a nozzle needle assembly |
| CN102251894A (en) * | 2010-05-19 | 2011-11-23 | 罗伯特·博世有限公司 | Fuel injector with hydraulic coupling unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108138716A (en) * | 2015-10-14 | 2018-06-08 | 大陆汽车有限公司 | For the piezoelectric injector of fuel injection |
| CN106870230A (en) * | 2017-01-06 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of common-rail injector |
| CN106870230B (en) * | 2017-01-06 | 2019-09-24 | 中国第一汽车股份有限公司 | A kind of common-rail injector |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2914838A1 (en) | 2015-09-09 |
| WO2014067720A1 (en) | 2014-05-08 |
| EP2914838B1 (en) | 2019-08-28 |
| DE102012219867A1 (en) | 2014-04-30 |
| CN104769269B (en) | 2018-01-19 |
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