EP2698527A1 - Ensemble de soupape pour soupape dýinjection et soupape dýinjection - Google Patents

Ensemble de soupape pour soupape dýinjection et soupape dýinjection Download PDF

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Publication number
EP2698527A1
EP2698527A1 EP12180630.1A EP12180630A EP2698527A1 EP 2698527 A1 EP2698527 A1 EP 2698527A1 EP 12180630 A EP12180630 A EP 12180630A EP 2698527 A1 EP2698527 A1 EP 2698527A1
Authority
EP
European Patent Office
Prior art keywords
valve
needle
recess
valve needle
resistance element
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.)
Withdrawn
Application number
EP12180630.1A
Other languages
German (de)
English (en)
Inventor
Mauro Grandi
Valerio Polidori
Marco Lunghi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP12180630.1A priority Critical patent/EP2698527A1/fr
Priority to PCT/EP2013/066398 priority patent/WO2014026872A1/fr
Publication of EP2698527A1 publication Critical patent/EP2698527A1/fr
Withdrawn legal-status Critical Current

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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M2200/707—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for avoiding fuel contact with actuators, e.g. isolating actuators by using bellows or diaphragms

Definitions

  • the invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in widespread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter and all the various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range.
  • injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or piezoelectric actuator.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example, in the range of up to 200 bar and in the case of a diesel engine in the range of more than 2000 bar.
  • the object of the invention is to create a valve assembly for an injection valve and an injection valve which is simply to be manufactured and which facilitates a reliable and precise function.
  • the invention is distinguished by a valve assembly of an injection valve, the valve assembly comprising a valve body including a central longitudinal axis, the valve body comprising a cavity with a fluid outlet portion, a valve needle axially movable in the cavity, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions.
  • the valve needle has a guide portion being designed to guide the valve needle in the valve body, a tip portion being designed to act together with the valve body to prevent the fluid flow through the fluid outlet portion, and a lower needle portion being arranged axially between the guide portion and the tip portion and comprising a recess. The recess enables a fluid flow to the fluid outlet portion.
  • a flow resistance element is arranged in the recess radially between the lower needle portion and the valve body.
  • the flow resistance element is shaped in a manner that at least in an axial portion of the recess the recess has a cross-section area with a given axially asymmetric shape.
  • valve assembly has the advantage that a fluid flow in the recess and in the fluid outlet portion is available which is axially asymmetric.
  • the flow resistance element may influence the angle and the structure of the fluid spray outside the valve assembly. Consequently, a fluid spray with an axially asymmetric spray structure may be generated.
  • the flow resistance element is fixedly coupled to the valve needle. This has the advantage that the flow resistance element has a fixed position relative to the valve needle. Consequently, a robust spray with an axially asymmetric spray structure may be generated.
  • valve needle and the flow resistance element are forming a one-piece element. This has the advantage that the valve needle may be manufactured together with the flow resistance element in one manufacturing process. Consequently, the valve needle with the flow resistance element may be manufactured with low costs.
  • the flow resistance element is shaped as a bar extending in axial direction between the guide portion and the tip portion of the valve needle. This has the advantage that the flow resistance element may be manufactured in an easy manner.
  • the invention is distinguished by an injection valve comprising an actuator unit and the valve assembly.
  • the valve needle is actuable by the actuator unit.
  • An injection valve 10 ( figure 1 ) that is used as a fuel injection valve for an internal combustion engine, comprises a housing 12, a valve assembly 14 and an actuator unit 16.
  • the housing 12 has a tubular shape.
  • the actuator unit 16 is arranged in the housing 12.
  • the actuator unit 16 comprises a piezo actuator, which changes its axial length depending on a control signal applied to it.
  • the actuator unit 16 may, however, also comprise another type of actuator, which is known to a person skilled in the art for that purpose. Such an actuator may be, for example, a solenoid.
  • the valve assembly 14 comprises a valve body 20 with a central longitudinal axis A and a cavity 24 which is axially led through the valve body 20.
  • a valve needle 22 which is movable in axial direction is arranged in the cavity 24.
  • the injection valve 10 has a fluid inlet portion 26 which is arranged in the housing 12 and which is hydraulically coupled to the cavity 24 and a not shown fuel connector.
  • the fuel connector is designed to be connected to a high pressure fuel chamber of an internal combustion engine, the fuel is stored under high pressure.
  • a fluid outlet portion 28 is formed, which is closed or open depending on the axial position of the valve needle 22. Outside of the closing position of the valve needle 22 there is a gap between the valve body 20 and the valve needle 22 at an axial end of the injection valve 10 facing away from of the actuator unit 16. The gap forms a valve nozzle 29.
  • a spring 30 is arranged between the valve body 20 and the valve needle 22.
  • the valve needle 22 comprises a spring rest 34.
  • the valve body 20 and the spring rest 34 of the valve needle 22 support the spring 30.
  • the injection valve 10 is of an outward opening type.
  • a bellow 36 is arranged between the valve needle 22 and the valve body 20.
  • the bellow 36 is sealingly coupling the valve body 20 with the valve needle 22. By this a fluid flow between the cavity 24 and a chamber 38 in which the actuator unit 16 is arranged is prevented.
  • the bellow 36 is formed and arranged in a way that the valve needle 22 is actuable by the actuator unit 16.
  • Figures 2 und 3 show an enlarged view of the valve assembly 14 with the valve needle 22.
  • the valve needle 22 has a guide portion 40.
  • the guide portion 40 can guide the valve needle 22 in the valve body 20.
  • the guide portion 40 comprises fluid channels 41 which allow a fluid flow from the fluid inlet portion 26 to the fluid outlet portion 28.
  • the fluid channels 41 may be uniformly distributed around the longitudinal axis A.
  • n may have a value of 20 or less, in particular of 10 or less.
  • a cross-sectional shape is understood to have an n-fold rotational symmetry when a rotation of 360°/n around the longitudinal axis A images the cross-sectional shape onto itself, n being a natural number.
  • the cross-sectional shape may expediently have a non-circular contour.
  • valve needle 22 has a lower needle portion 42.
  • the lower needle portion 42 has a recess 44.
  • the recess 44 has a basically annular shape.
  • the recess 44 allows a fluid flow to the fluid outlet portion 28.
  • the lower needle portion 42 may be formed as a constricted section of the valve needle 22 by means of the recess 44.
  • the valve needle 22 has a tip portion 50.
  • the tip portion 50 is conical. The tip portion 50 cooperates with the valve body 20 to prevent or enable the fluid flow through the fluid outlet portion 28.
  • a flow resistance element 52 is arranged in the recess 44.
  • the flow resistance element 52 is fixedly coupled to the valve needle 22.
  • the valve needle 22 and the flow resistance element 52 are formed in one piece ( Figure 4 ) .
  • the flow resistance element 52 is shaped as a bar. The bar extends in axial direction between the guide portion 40 and the tip portion 50. Due to the flow resistance element 52 the cross-section area of the recess 44 obtains a given axially asymmetric shape. In particular, a geometric center of the cross-section of the lower needle portion 42 including the flow resistance element 52 is radially spaced apart from the central longitudinal axis A.
  • the fluid is led from the fluid inlet portion 26 in the housing 12 to the guide portion 40.
  • the fluid passes through the channels 41 of the guide portion 40 and reaches the lower needle portion 42 to be led through the recess 44 to the fluid outlet portion 28 near the tip portion 50 of the valve needle 22.
  • the valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in the valve body 20 in a closing position of the valve needle 22 ( Figure 2 ). Outside of the closing position of the valve needle 22, the valve needle 22 enables the fluid flow through the fluid outlet portion 28 and the valve nozzle 29.
  • the fluid flow through the valve nozzle 29 results in a spray 60 which has basically a hollow conical shape.
  • the spray 60 propagates away from the valve nozzle 29 with a spray front 62 ( Figure 3 ).
  • the piezoelectric actuator may change its axial length if it gets energized. By changing its length the actuator unit 16 may effect a force on the valve needle 22.
  • the valve needle 22 can move in axial direction out of the closing position to form the gap between the valve body 20 and the valve needle 22 at the axial end of the injection valve 10 facing away from of the actuator unit 16.
  • the spring 30 may force the valve needle 22 towards the actuator unit 16. In the case when the actuator unit 16 is de-energized the actuator unit 16 shortens its length.
  • the spring 30 can force the valve needle 22 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 22 caused by the actuator unit 16 and the force on the valve needle 22 caused by the spring 30 whether the valve needle 22 is in its closing position or not.
  • valve needle 22 with the flow resistance element 52 allows to obtain an injection valve 10 with a restriction of the fluid flow in the recess 44 upstream the tip portion 50 of the valve needle 22.
  • the front 62 of the spray 60 may have a shape which is not perpendicular to the axis A of the valve needle 22 ( Figure 3 ).
  • the front 62 of the spray 60 may be tilted relative to the longitudinal axis A of the valve needle 22.
  • the cross section of the spray 60 is axially asymmetric as shown in Figure 3A .
  • injection valves 10 of the outward opening type with the flow resistance element 52 as shown here allow an application of these injection valves 10 in arrangements where an axially asymmetric shaped spray 60 is favorable. This is, for example, if the injection valve 10 is in a side position of a combustion chamber of the internal combustion engine. Consequently, a low emission and a low number of particles of the exhaust gas may be obtained for those applications.
  • the invention is not limited to specific embodiments by the description on the basis of said exemplary embodiments but comprises any combination of elements of different embodiments. Moreover, the invention comprises any combination of claims and any combination of features disclosed by the claims.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP12180630.1A 2012-08-16 2012-08-16 Ensemble de soupape pour soupape dýinjection et soupape dýinjection Withdrawn EP2698527A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12180630.1A EP2698527A1 (fr) 2012-08-16 2012-08-16 Ensemble de soupape pour soupape dýinjection et soupape dýinjection
PCT/EP2013/066398 WO2014026872A1 (fr) 2012-08-16 2013-08-05 Ensemble de soupape pour une soupape d'injection et soupape d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12180630.1A EP2698527A1 (fr) 2012-08-16 2012-08-16 Ensemble de soupape pour soupape dýinjection et soupape dýinjection

Publications (1)

Publication Number Publication Date
EP2698527A1 true EP2698527A1 (fr) 2014-02-19

Family

ID=46785242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12180630.1A Withdrawn EP2698527A1 (fr) 2012-08-16 2012-08-16 Ensemble de soupape pour soupape dýinjection et soupape dýinjection

Country Status (2)

Country Link
EP (1) EP2698527A1 (fr)
WO (1) WO2014026872A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2927473A1 (fr) * 2014-04-03 2015-10-07 Continental Automotive GmbH Soupape d'injection de carburant pour moteurs à combustion interne
EP3103999A1 (fr) * 2015-06-12 2016-12-14 Continental Automotive GmbH Ensemble de vanne pour vanne d'injection destinée à un moteur à combustion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082224A (en) * 1976-10-07 1978-04-04 Caterpillar Tractor Co. Fuel injection nozzle
EP0891851A1 (fr) * 1997-07-18 1999-01-20 Fisa Corporation Buses à obturateur
DE10254681A1 (de) * 2002-11-22 2004-06-09 Siemens Ag Einspritzdüse und Einspritzverfahren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008008111A1 (de) * 2008-02-08 2009-08-13 Continental Automotive Gmbh Einspritzventil, Verfahren und Vorrichtung zur Steuerung eines Einspritzventils

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082224A (en) * 1976-10-07 1978-04-04 Caterpillar Tractor Co. Fuel injection nozzle
EP0891851A1 (fr) * 1997-07-18 1999-01-20 Fisa Corporation Buses à obturateur
DE10254681A1 (de) * 2002-11-22 2004-06-09 Siemens Ag Einspritzdüse und Einspritzverfahren

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2927473A1 (fr) * 2014-04-03 2015-10-07 Continental Automotive GmbH Soupape d'injection de carburant pour moteurs à combustion interne
EP3103999A1 (fr) * 2015-06-12 2016-12-14 Continental Automotive GmbH Ensemble de vanne pour vanne d'injection destinée à un moteur à combustion

Also Published As

Publication number Publication date
WO2014026872A1 (fr) 2014-02-20

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