DE19843578A1 - Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle - Google Patents

Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle

Info

Publication number
DE19843578A1
DE19843578A1 DE1998143578 DE19843578A DE19843578A1 DE 19843578 A1 DE19843578 A1 DE 19843578A1 DE 1998143578 DE1998143578 DE 1998143578 DE 19843578 A DE19843578 A DE 19843578A DE 19843578 A1 DE19843578 A1 DE 19843578A1
Authority
DE
Germany
Prior art keywords
valve
fuel injection
valve needle
actuator
longitudinal axis
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.)
Ceased
Application number
DE1998143578
Other languages
German (de)
Inventor
Friedrich Boecking
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE1998143578 priority Critical patent/DE19843578A1/en
Publication of DE19843578A1 publication Critical patent/DE19843578A1/en
Ceased legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/04Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure using fluid, other than fuel, for injection-valve actuation
    • F02M47/046Fluid pressure acting on injection-valve in the period of injection to open it
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603Injectors peculiar thereto with means directly operating the valve needle using piezo-electric or magnetostrictive operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F02M61/163Means being injection-valves with helically or spirally shaped grooves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704Linkage 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

Abstract

A fuel injection valve (1), in particular an injection valve for fuel injection systems of internal combustion engines, has a piezoelectric or magnetostrictive actuator (3) and a valve closing body (15) which can be actuated by the actuator (3) via a valve needle (14). The valve closing body (15) interacts with a valve seat surface (18) to form a sealing seat. A longitudinal axis (32) of the actuator (3), along which the actuator (3) exerts an actuating force, is opposite a longitudinal axis (33) of the valve needle (14) along which the valve needle (14) can be moved by a predetermined distance ( a) arranged parallel offset.

Description

State of the art

The invention is based on a fuel injector according to the genus of the main claim.

DE 195 00 706 A1 already describes a fuel Spray valve known according to the genus of the main claim. With the resulting from this document Fuel injector is a piezoelectric actuator for actuating one with a valve closing body connected valve needle provided. The valve closing body acts with a valve seat surface to a sealing seat together. It is both the design as a after externally opening fuel injection valve as well as a inward opening fuel injector possible. The of several stacked, piezoelectric Layered piezoelectric actuator does indeed produce relatively large lifting forces, but relatively short lifting distances. In the known document is therefore proposed to Enlargement of the stroke distance transferred to the valve needle between the valve needle and the piezoelectric actuator to provide a hydraulic translation device.

The disadvantage of this known design is that due to the serial, axially offset arrangement of the piezoelectric actuator, the hydraulic translation device with the booster piston and the valve needle  results in a relatively elongated design. The known Fuel injector therefore protrudes relatively far from the Cylinder head of an internal combustion engine out what for Assembly is unfavorable.

Another disadvantage is that for the translation device a special hydraulic medium is used that escape due to leakage losses over time can. This can be how the translation facility works tion and the service life of the fuel injector affect.

DE 43 06 073 C1 describes a fuel injector with a piezoelectric actuator in a different design known. With this fuel injector there is a Transformation of the movement of the piezoelectric actuator the movement of the valve needle also by means of a hydrauli translation device. Even with that from this Known fuel injector are the piezoelectric actuator, one with the translation device interacting reciprocating piston and the valve needle in series arranged one behind the other, axially offset from each other, so that there is a relatively long design. Furthermore, here too the possible loss of leakage of the hydraulic medium part.

Advantages of the invention

The fuel injector according to the invention with the Merk Painting the main claim has the advantage that due to the parallel offset arrangement of the longitudinal axis of the actuator with respect to the longitudinal axis of the valve needle a significantly smaller length of the fuel injector according to the invention results. The The fuel injector according to the invention therefore projects in the Comparison to those known from the prior art Fuel injectors less far from that Cylinder head in front, so that the installation space for one Camshaft, for intake and exhaust valves, for one  Spark plug and for other components of the internal combustion engine is not affected.

By the measures listed in the subclaims advantageous further developments and improvements of the Main claim specified fuel injector possible.

One is advantageous between the actuator and the valve needle hydraulic translation device provided, the Actuator with a first booster piston and the valve needle interact with a second booster piston. It is advantageously the first booster piston along the Longitudinal axis of the actuator and the second booster piston aligned along the longitudinal axis of the valve needle so that the actuator on the first booster piston and the second An axial translator piston on the valve needle Force component transferred.

One can be axially offset to the second booster piston Return spring can be provided, advantageously the actuator is arranged laterally next to the return spring. this has the advantage that the first booster piston and the second The translator piston is also arranged side by side can be, with a relative in the axial direction flat-shaped translation chamber on the translation pistons can connect.

The hydraulic medium with which the Translator chamber is filled, which in the fuel Fuel valve led to the sealing seat. this has the advantage that no for filling the translation chamber special hydraulic medium, for example a special one Hydraulic oil, which is required due to leakage ver lusts could contaminate the fuel. about The fuel column can be guided into the booster chamber quasi-statically automatic as a hydraulic medium be refilled continuously.  

A biasing element preferably encloses the actuator sleeve-like. Compared to a serial, axially offset Arrangement of the biasing element and the actuator increases this the compactness of the fuel injection according to the invention valve.

The valve needle is preferably made of two valve needles sections assembled, with a first valve needle section in one piece with one of the booster pistons and one other valve needle section in one piece with the Valve closing body is formed. The two valve needles Sections can be easily connected via a coupling piece get connected. This simplifies the assembly of the erfin fuel injector according to the invention considerably.

drawing

An embodiment of the invention is in the drawing shown in simplified form and in the following description exercise explained in more detail. Show it:

Figure 1 shows an axial section through an embodiment of the fuel injector according to the invention. and

Fig. 2 shows the detail II in FIG. 1.

Description of the embodiment

Fig. 1 shows an axial sectional view of an embodiment of the fuel injector 1 according to the invention. The fuel injection valve 1 is particularly suitable for the direct injection of fuel, in particular special gasoline, into the combustion chamber of a preferably mixture-compressing, spark-ignition internal combustion engine.

A piezoelectric actuator 3 is integrated in a housing body 2 and is surrounded by a biasing element 4 in the manner of a sleeve. The piezoelectric actuator 3 is clamped between a first actuator flange 5 and a second actuator flange 6 by means of the prestressing element 4 connected to the actuator flanges 5 and 6 . The actuator 3 , the actuator flanges 5 and 6 and the prestressing element 4 are inserted into a first cylindrical recess 8 of the housing body 2 . The actuator 3 is supported via the first actuator flange 5 on a locking element 7 screwed to the housing body 2 . The closure element 7 has an engagement trough 9 for a suitable tool.

At the second actuator flange 6 , a first booster piston 10 follows, which is part of a device 11 . In addition to the first booster piston 10, the translation device 11 consists of a second booster piston 12 and a booster chamber 13 filled with a hydraulic medium. Here, the standing to the actuator 3 in conjunction first booster piston 10 is adjacent to a first area A1 to the booster chamber 13, while the second booster piston 12 is adjacent to the booster chamber 13 through a opposite the first surface smaller A1 second area A2.

The second booster piston 12 serves to actuate a valve needle 14 . The valve needle 14 in the illustrated embodiment consists of a first valve needle section 14 a formed integrally with the second booster piston 12 and a second valve needle section 14 b formed integrally with a valve closing body 15 b. The two valve needle sections 14 a and 14 b are connected to one another by means of a coupling piece 16 . The connection of the two valve needle sections 14 a and 14 b can be seen better from FIG. 2, which shows the region II in FIG. 1 in an enlarged view, and is described in detail below.

A conical section 19 of the valve closing body 15 interacts with a valve seat surface 18 formed on a valve seat carrier 17 to form a sealing seat. An injection opening 20 formed in the valve seat carrier 17 adjoins the sealing seat. A cylindrical section 21 of the valve needle 14 has at least one swirl groove 22 for better distribution of the fuel. The valve seat carrier 17 is held on the housing body 2 by means of a clamping nut 24 which is screwed via a thread 23 with the housing body. 2

A return spring 25 adjoins the second booster piston 12 axially at the end opposite the valve closing body 15 and abuts the second booster piston 12 via a contact element 26 . The return spring 25 is supported via a ring 27 on a fuel inlet connector 28 screwed into the housing body 2 . The return spring 25 is located in a second cylindrical recess 29 in the housing body 2 .

The fuel flows through the fuel inlet connector 28 into the second recess 29 of the housing body 2 and from there via a longitudinal bore 30 through the first valve needle section 14 a into a recess 31 of the valve seat carrier 17th From there, the fuel flows via the swirl groove 22 to the sealing seat and is sprayed off via the spray opening 20 .

According to the invention, the longitudinal axis 32 of the actuator 3 , along which the actuator 3 exerts an actuating force, is arranged offset in parallel with respect to the longitudinal axis 33 of the valve needle 14 , along which the valve needle 14 is axially movable, by a predetermined distance a. This parallel arrangement of the actuator and the first booster piston 10 on the one hand and the valve needle 14 with the second booster piston 12 on the other hand, that the axial length of the fuel injection valve 1 according to the invention is significantly reduced as compared to a serial arrangement the advantage. The cylinder head of an internal combustion engine at which the inventive fuel injection valve 1 is mounted, is therefore less dominated by the fuel injection valve 1 upward far, so that less installation space is required above the cylinder head. There is therefore more installation space for other elements of the internal combustion engine, for example the camshaft, the spark plug, the intake and exhaust valves and the like.

The method of operation of the fuel injector 1 according to the invention is as follows:
When an electric betae is applied actuation voltage to the piezoelectric actuator 3, 1 extends therefrom along the longitudinal axis 32 of the actuator 3, and shifts on the second actuator flange 6 the first booster piston 10 in Fig. Downwardly, so that in the booster chamber 13, the hydraulic Medium is displaced. Correspondingly, the second booster piston 12 and thus the valve needle 14 and the valve closing body 15 in FIG. 1 are raised upward, so that the valve closing body 15 lifts off the valve seat surface 18 and releases the sealing seat. Since the area A2, with which the second booster piston adjacent to the translator chamber 12, 13 is smaller than the area A1 with which the first booster piston 10 is adjacent to the Übersetzerkam mer 13, the stroke generated the valve needle 14 is greater than that of the Actuator 3 actuation stroke.

When the electrical actuation voltage of the actuator 3 is switched off, the return spring 25, the valve needle 14 and the valve closing body 15 again in the closed position, in which the valve closing body 15 rests on the valve seat surface 18 .

Preferably, as the hydraulic medium, with which the booster chamber 13 is filled, the fuel injector 1 used in the fuel to the sealing seat is used. This has the advantage that a guide gap between the first valve needle section 14 a and the housing body 2 can continuously, quasi-statically fuel flow to the translation chamber 13 and any leakage losses can be compensated for. Furthermore, there is no danger that a special hydraulic medium, for example a special hydraulic oil, located in the booster chamber 13 could contaminate the fuel.

Fig. 2 shows the detail II in Fig. 1 in an enlarged view. The first valve needle section 14 a, the second valve needle section 14 b, the axial longitudinal bore 30 in the first valve needle section 14 a and the coupling piece 16 connecting the two valve needle sections 14 a and 14 b can be seen. The axial longitudinal bore 30 is followed by a radial transverse bore 40 , which open out into the recess 31 of the valve seat carrier 17 via radial bores 41 and 42 in the coupling piece 16 . The coupling piece 16 is sleeve-shaped and encloses both the first valve needle section 14 a and the second valve needle section 14 b. The first valve needle section 14 a has a first annular groove 43 and the second valve needle section 14 b has a second annular groove 44 . In the first annular groove 43 of the first valve needle section 14 a, a first inside projection 45 of the coupling piece engages, while in the second annular groove 44 of the second valve needle section 14 b, a second inside projection 46 of the coupling piece 16 engages. The coupling piece 16 can therefore be latched to the two valve needle sections 14 a and 14 b.

The two-part design of the valve needle 14 considerably facilitates the assembly of the fuel injector 1 according to the invention. During assembly, the components integrated in the housing body 2 are first assembled and assembled. Subsequently, the second valve needle section 14 b and the valve closing body 15 formed integrally therewith are attached to the first valve needle section 14 a projecting out of the housing body 2 and locked by means of the coupling piece 16 . Finally, the valve seat carrier 17 is slipped over the valve needle 14 and locked to the housing body 2 by means of the clamping nut 24 .

The invention is not restricted to the exemplary embodiment shown. For example, instead of a piezoelectric actuator 3 , a magnetostrictive actuator can also be used in the same way. Furthermore, the invention is also suitable for fuel injection valves which open outwards, in which case it is advantageous for the translation device 13 to transmit no outward-pointing but rather an outward-lifting movement to the valve needle 14 .

Claims (8)

1. Fuel injection valve ( 1 ), in particular injection valve for fuel injection systems of internal combustion engines, with
a piezoelectric or magnetostrictive actuator ( 3 ), and
a valve closing body ( 15 ) which can be actuated by the actuator ( 3 ) via a valve needle ( 14 ) and which cooperates with a valve seat surface ( 18 ) to form a sealing seat, characterized in that
that a longitudinal axis ( 32 ) of the actuator ( 3 ), along which the actuator ( 3 ) exerts an actuating force, relative to a longitudinal axis ( 33 ) of the valve needle ( 14 ), along which the valve needle ( 14 ) can be moved, by a predetermined distance ( a) is arranged offset in parallel.
2. Fuel injection valve according to claim 1, characterized in that a hydraulic translation device ( 11 ) is provided between the actuator ( 3 ) and the valve needle ( 14 ), the actuator ( 3 ) via a first booster piston ( 10 ) and the valve needle ( 14 ) is connected via a second booster piston ( 12 ) to a booster chamber ( 13 ) of the booster device ( 11 ) filled with a hydraulic medium.
3. Fuel injection valve according to claim 2, characterized in that the first booster piston ( 10 ) along the longitudinal axis ( 32 ) of the actuator ( 3 ) and the second booster piston ( 12 ) along the longitudinal axis ( 33 ) of the valve needle ( 14 ) is aligned.
4. Fuel injection valve according to claim 3, characterized in that on a valve closing body ( 15 ) facing away from the second booster piston ( 12 ) engages a return spring ( 25 ) which is arranged axially offset to the second booster piston ( 12 ).
5. Fuel injection valve according to claim 4, characterized in that the actuator ( 3 ) with respect to the return spring ( 25 ) laterally offset, but is arranged approximately at the same axial distance from the valve closing body ( 15 ).
6. Fuel injection valve according to one of claims 2 to characterized in that the hydraulic medium, with which the translation chamber ( 13 ) is filled, in the fuel injection valve ( 1 ) is led to the sealing seat fuel.
7. Fuel injection valve according to one of claims 1 to 6, characterized in that a biasing element ( 4 ) surrounds the actuator ( 3 ) like a sleeve.
8. Fuel injection valve according to one of claims 1 to characterized in that the valve needle ( 14 ) from a with the second booster piston ( 12 ) integrally formed first valve needle section ( 14 a) and with the valve closing body ( 15 ) integrally formed second valve needle section ( 14 b), the first valve needle section ( 14 a) being connected to the second valve needle section ( 14 b) via a coupling piece ( 16 ).
DE1998143578 1998-09-23 1998-09-23 Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle Ceased DE19843578A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1998143578 DE19843578A1 (en) 1998-09-23 1998-09-23 Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998143578 DE19843578A1 (en) 1998-09-23 1998-09-23 Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle
PCT/DE1999/000863 WO2000017508A1 (en) 1998-09-23 1999-03-24 Fuel injection valve

Publications (1)

Publication Number Publication Date
DE19843578A1 true DE19843578A1 (en) 2000-03-30

Family

ID=7881937

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1998143578 Ceased DE19843578A1 (en) 1998-09-23 1998-09-23 Fuel injection valve especially for fuel injection installations of IC engines has longitudinal axis along which actuator exerts operating force displaced but parallel with respect to longitudinal axis of valve needle

Country Status (2)

Country Link
DE (1) DE19843578A1 (en)
WO (1) WO2000017508A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174615A2 (en) * 2000-07-18 2002-01-23 Delphi Technologies, Inc. Fuel injector
WO2002084106A1 (en) * 2001-04-11 2002-10-24 Robert Bosch Gmbh Valve for controlling liquids
WO2005026531A1 (en) * 2003-09-10 2005-03-24 Siemens Aktiengesellschaft Injection valve for injecting fuel into an internal combustion engine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59008025D1 (en) * 1990-03-09 1995-01-26 Siemens Ag Valve with a piezoelectric actuator.
DE4306073C1 (en) 1993-02-26 1994-06-01 Siemens Ag Metering system for dosing of fluids with injection valve for IC engine - has piston acting on closing unit, and spring with actuator acting on large dia. piston moving in cylinder
JPH0861181A (en) * 1994-08-25 1996-03-05 Mitsubishi Electric Corp Fuel injection device
DE19500706C2 (en) 1995-01-12 2003-09-25 Bosch Gmbh Robert Metering valve for dosing liquids or gases
DE19519191C2 (en) * 1995-05-24 1997-04-10 Siemens Ag Injector
JP3740733B2 (en) * 1996-02-13 2006-02-01 いすゞ自動車株式会社 Fuel injection device for internal combustion engine
DE19650900A1 (en) * 1996-12-07 1998-06-10 Bosch Gmbh Robert Piezoelectric actuator
DE19709795A1 (en) * 1997-03-10 1998-09-17 Bosch Gmbh Robert Fuel injection valve for internal combustion engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174615A2 (en) * 2000-07-18 2002-01-23 Delphi Technologies, Inc. Fuel injector
EP1174615A3 (en) * 2000-07-18 2002-08-28 Delphi Technologies, Inc. Fuel injector
US7451938B2 (en) 2000-07-18 2008-11-18 Delphi Technologies, Inc. Fuel injector
WO2002084106A1 (en) * 2001-04-11 2002-10-24 Robert Bosch Gmbh Valve for controlling liquids
US6843464B2 (en) * 2001-04-11 2005-01-18 Robert Bosch Gmbh Valve for controlling liquids
WO2005026531A1 (en) * 2003-09-10 2005-03-24 Siemens Aktiengesellschaft Injection valve for injecting fuel into an internal combustion engine

Also Published As

Publication number Publication date
WO2000017508A1 (en) 2000-03-30

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