EP1159526A1 - Stellantrieb für einen kraftstoffinjektor - Google Patents
Stellantrieb für einen kraftstoffinjektorInfo
- Publication number
- EP1159526A1 EP1159526A1 EP00920356A EP00920356A EP1159526A1 EP 1159526 A1 EP1159526 A1 EP 1159526A1 EP 00920356 A EP00920356 A EP 00920356A EP 00920356 A EP00920356 A EP 00920356A EP 1159526 A1 EP1159526 A1 EP 1159526A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- transmission element
- nozzle needle
- deflection
- fuel
- 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
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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
-
- 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
Definitions
- the invention oetr fft an actuator for one
- a solcner actuator is known from US-4 101 076.
- US Pat. No. 4,101,076 describes a fuel projector which has a piezoelectric actuator, or which uses a mechanical transmission element to generate a nozzle needle in the fuel. e gate controlled.
- the transmission element has two lever arms of different lengths, which are connected to each other at various angles, the transmission element being supported on the housing of the fuel projector in this heating region.
- the shorter arm of the transmission element rests on the piezoelectric actuator, with a return spring supported on the housing of the fuel projector ensuring constant contact.
- the longer lever arm ⁇ es transmission element is in connection with the back of the nozzle needle, wherein a return spring arranged around the nozzle needle holds the nozzle needle on the lever arm.
- the transmission element When the piezoelectric actuator is deflected, the transmission element is rotated around a thrust point at its winding area lying on the housing of the fuel projector, so that the longer lever arm is moved away from the top of the back of the nozzle needle. At the same time, however, the force of the return spring guides the nozzle needle, which opens the fuel injector and fuel is injected into a combustion chamber of an internal combustion engine. Due to the lever arms of the transmission element of different lengths, the deflection of the piezoelectric actuator is also implemented as a larger deflection of the nozzle needle.
- Fuel injector causes inaccuracies in the transmission of the deflection of the piezoelectric actuator.
- the aforementioned transmission element requires a large amount of space and in particular requires the two return springs mentioned in order to make constant contact between the lever arms and the piezoelectric actuator DZW. to hold the back of the nozzle needle.
- the pressure forces occurring during the switching processes can furthermore lead to deformations and tensions at the support points of the transmission element on the piezoelectric actuator, on the back of the nozzle needle or at the exact location of the fuel injector, which cause wear and tear of the transmission elements and thus immediately cause a stroke loss can.
- the actuator according to the invention for a fuel injector is characterized by a flexible transmission element which is arranged between an actuator and a nozzle needle and has a plate-like cross section.
- the oiegeelastic transmission element stent on its underside in a central region in an active connection with the nozzle needle and on its top in an outer region in an active connection with the actuator, with the flexible transmission element being additionally supported on its underside on a housing of the fuel projector.
- the outer area of the flexurally elastic transmission element is printed downwards via the operative connection between the actuator and the flexible transmission element.
- This movement of the outer region of the flexible transmission element n in the direction of the deflection of the actuator is determined by the bearing region of the elastic-elastic transmission element on the housing of the fuel injector into a movement of the elastic-elastic transmission element in its central region in the direction of the actuator.
- this nozzle needle is also moved, so that the nozzle needle opens and the fuel injection process is triggered.
- the transmission element Through the design of the transmission element according to the invention, its roughness is reduced to a M nim ⁇ . Furthermore, the "onne that a restoring spring is necessary oertragungseiement be easilyoildet emstuckig. Moreover ermoglicnt a NaCN outwardly opening operatively connected to the nozzle needle by the Wegumledge the deflection of the actuator, so that a simple configuration let reach the active compound. Finally, characterized the transmission element from yours a high wear resistance and thus good functional reliability.
- the invention is illustrated by the drawing.
- the drawing shows an embodiment of a measurement according to the invention. Actuator for a fuel in cross section.
- a fuel injector has an injector se 1 with a multi-stage inner bore 11, m a piezoelectric actuator 2 and a piston-shaped actuator 3 are arranged.
- the piston-shaped actuator 3 is oaoei preferably directly coupled to a nozzle needle (not shown) in the fuel injector.
- the piezoelectric actuator 2 is constructed from a plurality of upper stacked piezoelectric actuator elements 21 which are arranged in a spring-elastic hollow body 22. This hollow body 22 is connected to a head plate 23 and a base plate 24, the piezoelectric ones stacked on top of one another
- Actuator elements 21 are biased with a defined force of preferably 800 to 1000 N.
- the actuator elements 21 are conductively connected to contact pins (not shown) protruding from the top plate 23, to which a voltage is applied to an actuator connection 4 placed on the actuator, thereby causing elongation in the piezoelectric actuator 2 .
- the piezoelectric actuator 2 is further arranged in an actuator housing 25, which is firmly clamped at the upper end of the inner ring 11 formed in the injector housing 1.
- the actuator home 25 is printed on a shim 26 which rests on a first bore step 12.
- the actuator housing 25 is held in place by a hollow screw 29, which engages on a clamping ring 28 surrounding the actuator housing 25 and is screwed to the actuator housing 1.
- the base plate 24 of the piezoelectric actuator is provided with a preferably circular attachment 241 in the center.
- a disk-shaped sealing membrane 26 is arranged around this attachment 241, firmly connected to the base plate 24, and extends from the base plate 24 to the inner wall of the injector housing 1.
- the sealing membrane 26 is fixed in its outer area between the adjusting disk 27 and the actuator housing 25 and serves to protect the piezoelectric actuator 2 from a leakage of fuel from the fuel injector.
- a transmission element 5 is also arranged in the inner bore 11 on a second bore step 13.
- This transmission element 5 is composed of an oastic-elastic base part 51, preferably made of spring steel, a highly rigid cover plate 52 arranged on the base part 51 and a valve ball 53 arranged underneath the base part 51.
- the flexurally elastic base part 51 of the transmission element 5 is essentially disc-shaped and has a plate-like cross-section, its underside being in an annular shape
- the base part 51 is also highly external from the support area 511 to an outer area 512, on an edge 514 of this outer area 512, the cover plate 52 is fastened with its underside. The rear side of this cover plate 52 is still firmly connected to the attachment 241 on the base plate 24 of the actuator.
- the valve ball 53 is also fixedly attached to the bottom part 51 of the transmission element 5 in a center opening 513 on the underside.
- a valve seat 14 is assigned to the valve ball 53 in the second bore stage 13. This valve seat 14 is vercun ⁇ en via a Durcngangsbonrung 15 with a control chamber 16, which is the inner cone 11 devisnalo ees actuator 3 vercun ⁇ en.
- the control chamber 16 also has, via a throttling device 17, a deformation to a fuel supply 18 in the injector area 1, m the fuel is under a high pressure.
- valve ball 53 is pressed through the base part 51 of the transmission element 5 onto the valve seat 14, so that the control chamber 16 is tightly connected to the second bore step 13.
- the fuel pressure which then arises in the control chamber 16 ensures that the actuator 3 is pressed downward against a restoring force and that the nozzle needle in the fuel injector, which is connected to the actuator 3, remains closed.
- the attachment 241 on the base plate 24 uses the cover plate 52 of the transmission element 5 to print the outer region 512 or the base part 51 downward by means of the actuator deflection.
- This movement of the outer area 512 on the bobo part 51 of the transmission element 5 in the direction against the second bore step 13 is deflected by the contact area 511 of the bottom part 51 on the second boring step 13 into a counter-movement of the center area 513 on the bottom part 51 and causes them on the ttenoereicn 513 Fixed valve lobe ..
- the transmission ratio of the actuator deflection to the deflection of the center region 513 of the bottom part 51 and thus to the deflection of the valve ball 53 depends on the ratio between the effective distance from the edge 514 to the support area 512 and the effective distance from the support area 511 to the center area 513. If - as shown in the drawing - the effective distance from the central area 513 to the support area 511 of the base part 51 is greater than the effective distance from the support area 511 to the edge 514 of the base part 51, the deflection of a piezoelectric actuator 2 into one is increased Deflection of the valve ball 53 translated. Such a translation is particularly advantageous in the case of the piezoelectric actuator 2 used in the embodiment, since its deflection moves in the ⁇ m range, so that an increase in this deflection is helpful for a reliable actuating process.
- the valve ball 52 is then removed from the valve seat 14, the through hole 15 to the control chamber 16 is opened and fuel can then flow from this control chamber into the second bore stage 13 and from here via a leakage drain (not shown). be led to the outside.
- the force exerted on the actuator 3 by the fuel in the control chamber 16 drops Holding force, so that the actuator 3 is moved upward in the direction of the through bore 15 by the restoring force acting on it, which can be generated, for example, by a nozzle spring or also by the fuel pressure in the fuel supply 18.
- the nozzle needle connected to the actuator is opened in the fuel injector and fuel can be injected into a combustion chamber of an internal combustion engine.
- the piezoelectric actuator 2 contracts again and returns to its position shown in the drawing.
- the base plate 24 of the piezoelectric actuator 2 and thus the cover plate 52 of the transmission element 5 firmly connected to the attachment 241 of the base plate 24 also returns to the starting position. Because of their elastic
- the base plate 51 then also takes on its original shape again, the center region 513 pressing the valve ball 53 onto the valve seat 14 and thus closing the through-bore 15.
- the fuel pressure in the control chamber 16 rises again and the actuator will move downward as a result of the resulting fuel pressure, so that the nozzle needle in the fuel injector closes and the injection process is ended.
- Essential to the design of the transmission element 5 according to the invention is the flexurally elastic design of the base part 51, which ensures that the inward movement of the piezoelectric actuator 2 during the deflection is reversed into an outward movement of the central region 513 on the transmission element 51, which is used via the active connection with the actuator 3 to control the nozzle needle.
- This reversal of the path enables a simplified design of the operative connection between the transmission element 5 and the actuator or the Düsseldorf needle, since the operative connection can open outwards in a simple manner.
- the flexurally elastic design of the base part 51 of the transmission element 5 ensures that this base part 51 automatically after the deflection of the actuator 2 into its returns to the original position so that no additional return spring is necessary.
- the exact positioning of the actuator 2 with respect to the transmission element 5 can be achieved by choosing a suitable adjusting disc 2 ′′ between the actuator housing 25 and the first bore step 12 m in the injector housing 1.
- a different actuator principle can also be used instead of a piezoelectric actuator.
- the hydraulic control of the actuator 3 shown in the drawing can also be replaced by a direct action of the bottom part 51 of the transmission element 5 on the actuator.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19909539A DE19909539C2 (de) | 1999-03-04 | 1999-03-04 | Stellantrieb für einen Kraftstoffinjektor |
DE19909539 | 1999-03-04 | ||
PCT/DE2000/000629 WO2000052322A1 (de) | 1999-03-04 | 2000-03-01 | Stellantrieb für einen kraftstoffinjektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1159526A1 true EP1159526A1 (de) | 2001-12-05 |
EP1159526B1 EP1159526B1 (de) | 2005-05-18 |
Family
ID=7899714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00920356A Expired - Lifetime EP1159526B1 (de) | 1999-03-04 | 2000-03-01 | Stellantrieb für einen kraftstoffinjektor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1159526B1 (de) |
DE (2) | DE19909539C2 (de) |
WO (1) | WO2000052322A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19939476C2 (de) * | 1999-08-20 | 2003-02-20 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE10029067B4 (de) * | 2000-06-13 | 2006-03-16 | Siemens Ag | Einspritzventil mit vorgespanntem Schließglied |
DE10118563A1 (de) * | 2001-04-14 | 2002-11-07 | Bosch Gmbh Robert | Piezoelektrisches Aktormodul |
DE10216154A1 (de) | 2002-04-12 | 2003-10-23 | Hydraulik Ring Gmbh | Druckbegrenzungsventil, insbesondere für Diesel-Hochdruckpumpen von Einspritzvorrichtungen in Kraftfahrzeugen |
DE10216153A1 (de) | 2002-04-12 | 2003-10-23 | Hydraulik Ring Gmbh | Drosselventil,insbesondere für Diesel-Hochdruckpumpen von Einspritzvorrichtung in Kraftfahrzeugen |
US6739575B2 (en) | 2002-06-06 | 2004-05-25 | Caterpillar Inc | Piezoelectric valve system |
DE102011056096B4 (de) * | 2011-12-06 | 2014-06-26 | Pierburg Gmbh | Elektromagnetventil |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022166A (en) * | 1975-04-03 | 1977-05-10 | Teledyne Industries, Inc. | Piezoelectric fuel injector valve |
JPS62157274A (ja) * | 1985-12-28 | 1987-07-13 | Aisan Ind Co Ltd | 燃料噴射弁 |
DE4101076A1 (de) | 1990-01-18 | 1991-08-08 | Heinz Doevenspeck | Verfahren und vorrichtung zur behandlung mehrphasiger stoffe |
DE59010904D1 (de) * | 1990-09-25 | 2000-05-31 | Siemens Ag | Anordnung für einen in Hubrichtung wirkenden adaptiven, mechanischen Toleranzausgleich für den Wegtransformator eines piezoelektrischen Aktors |
JP3740733B2 (ja) * | 1996-02-13 | 2006-02-01 | いすゞ自動車株式会社 | 内燃機関の燃料噴射装置 |
DE19714486C2 (de) * | 1997-04-08 | 1999-12-30 | Siemens Ag | Vorrichtung zum Übertragen einer Auslenkung eines Aktors |
DE19802495A1 (de) * | 1997-06-19 | 1998-12-24 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
-
1999
- 1999-03-04 DE DE19909539A patent/DE19909539C2/de not_active Expired - Fee Related
-
2000
- 2000-03-01 DE DE50010351T patent/DE50010351D1/de not_active Expired - Lifetime
- 2000-03-01 EP EP00920356A patent/EP1159526B1/de not_active Expired - Lifetime
- 2000-03-01 WO PCT/DE2000/000629 patent/WO2000052322A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0052322A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000052322A1 (de) | 2000-09-08 |
EP1159526B1 (de) | 2005-05-18 |
DE19909539C2 (de) | 2001-02-08 |
DE19909539A1 (de) | 2000-10-05 |
DE50010351D1 (de) | 2005-06-23 |
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