EP1309795B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1309795B1
EP1309795B1 EP20010955272 EP01955272A EP1309795B1 EP 1309795 B1 EP1309795 B1 EP 1309795B1 EP 20010955272 EP20010955272 EP 20010955272 EP 01955272 A EP01955272 A EP 01955272A EP 1309795 B1 EP1309795 B1 EP 1309795B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
sealing ring
valve
receiving bore
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.)
Expired - Fee Related
Application number
EP20010955272
Other languages
German (de)
French (fr)
Other versions
EP1309795A1 (en
Inventor
Guenther Hohl
Ferdinand Reiter
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
Priority to DE2000138300 priority Critical patent/DE10038300A1/en
Priority to DE10038300 priority
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE2001/002764 priority patent/WO2002012717A1/en
Publication of EP1309795A1 publication Critical patent/EP1309795A1/en
Application granted granted Critical
Publication of EP1309795B1 publication Critical patent/EP1309795B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M61/14Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M61/165Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M2200/85Mounting of fuel injection apparatus
    • F02M2200/858Mounting of fuel injection apparatus sealing arrangements between injector and engine

Description

State of the art

The invention is based on a fuel injection valve with sealing ring according to the preamble of claim 1.

From DE 197 35 665 A1 is a fuel injection system known, comprising a compensation element consisting of a Support body consists of a dome-shaped support surface Has. A fuel injector rests on this Compensation element in a receiving bore of a Cylinder head off. In the annular gap between the mounting hole and fuel injector is a sealing ring in a groove of the fuel injection valve, the annular gap seals against the combustion chamber. Since that Fuel injection valve on the spherically shaped Kalottenfläche rests with a support surface, the Fuel injector to a certain extent Angular deviation mounted to the axis of the mounting hole be and firmly into the receiving bore by suitable Means, such as a clamping claw pressed. Thus, a simple adaptation to the Fuel supply lines allows. Tolerances in the Manufacturing and assembly of fuel injectors can thus be compensated.

The disadvantage, however, is that this known embodiment Although a larger tolerance angle allows, but that Problem of sealing the annular gap between Receiving bore and fuel injector still reinforced, since at a larger tilt angle the seal only takes place by the elasticity of the sealing ring by this has a large cross-sectional area and elasticity and still dense to a large extent uneven bruising got to.

Advantages of the invention

The fuel injection valve according to the invention with the characterizing features of the main claim has In contrast, the advantage that there is a secure seal of the Annular gaps between receiving bore and fuel injector even with a pivoting of Fuel injection valve to the axis of the receiving bore over a relatively large angular range allows. Furthermore is the solution according to the invention to seal the annular gap, easy and inexpensive to manufacture.

By the measures specified in the dependent claims are advantageous developments and improvements in the Main claim specified fuel injection valve with Sealing ring possible.

In particular, the fuel injection valve a Valve seat carrier or nozzle body as a deep-drawn part have, whose part-spherical surface particularly inexpensive, for example by rolling, made can be.

drawings

A fuel injection valve according to the invention and for illustrative purposes a detail of a corresponding fuel injection valve according to the prior art are shown in simplified form in the drawings and explained in more detail in the following description. Show it:

Fig. 1
a section through a fuel injection valve according to the invention with a sealing ring;
Fig. 2
an enlarged view corresponding to the section III in Figure 1 in an embodiment of a fuel injection valve with a sealing ring according to the prior art.
Fig. 3
an enlarged view of the section III in Fig. 1; and
Fig. 4
in a representation corresponding to section III in Fig. 1, a further embodiment according to the invention of a fuel injection valve with a sealing ring
Description of the embodiments

The invention shown in Fig. 1 Fuel injection valve 1 with a sealing ring 1a is in the shape of a fuel injection valve for Fuel injection systems of mixture compression, spark-ignited internal combustion engines running. The Fuel injector 1 is not closer in here shown receiving bore of the cylinder head 1b used. The cylinder head 1b is only in the range of Sealing ring 1a shown as a sectional area, as this for the invention considerable scope in the following figures will be described in more detail. The fuel injection valve 1 is particularly suitable for direct injection of Fuel in a combustion chamber, not shown a Internal combustion engine.

The fuel injection valve 1 consists of a Nozzle body 2, in which a valve needle 3 is guided. The valve needle 3 is connected to a valve closing body 4 in Operative connection, with a on a valve seat body. 5 arranged valve seat surface 6 to a sealing seat interacts. When the fuel injection valve 1 acts it is in the exemplary embodiment to an inwardly opening Fuel injection valve 1, which via a Spray opening 7 has. The nozzle body 2 is through a Seal 8 against the outer pole 9 of a magnetic coil 10, the serves as an actuator, sealed. The magnet coil 10 is in encapsulated a coil housing 11 and a coil carrier 12 wound, which at an inner pole 13 of the solenoid 10 is present. The inner pole 13 and the outer pole 9 are through a gap 26 separated from each other and based on a connecting member 29 from. The magnetic coil 10 is over a line 19 from one via an electrical Plug contact 17 energized electrical power. Of the Plug contact 17 is of a plastic casing 18th surrounded, which can be molded on the inner pole 13.

The valve needle 3 is in a valve needle guide fourteenth guided, which is designed disk-shaped. to Stroke adjustment is a paired shim 15. An the other side of the dial 15 is a Anchor 20. This is frictionally connected via a flange 21 with the valve needle 3 in conjunction, by a Weld 22 is connected to the flange 21. On the Flange 21 is supported by a return spring 23, which in the present design of the fuel injection valve. 1 is biased by a sleeve 24. In the Valve needle guide 14, the armature 20 and the valve seat body fifth run fuel channels 30a to 30c, the fuel, which fed via a central fuel supply 16 and is filtered by a filter element 25, for Lead spray opening 7. The fuel injection valve 1 is by a seal 28 against a not further sealed fuel supply shown sealed. Of the drawn angle α clarifies the desired Tilting of the fuel injection valve 1 to a Manufacturing tolerance or installation tolerances between the not shown fuel inlet and the receiving bore compensate.

In the idle state of the fuel injection valve 1 is the Anchor 20 of the return spring 23 against its Lifting direction acted upon so that the valve closing body. 4 is held in sealing engagement with the valve seat 6. at Excitation of the magnetic coil 10 builds this a magnetic field, which the armature 20 against the spring force of Return spring 23 moves in the stroke direction, wherein the stroke through one in the rest position between the inner pole 13 and the Anchor 20 working gap 27 is given. Of the Anchor 20 takes the flange 21, which with the valve needle 3rd is welded, also in the stroke direction with. The one with the Valve needle 3 in operative connection valve closing body 4 lifts off the valve seat surface and the over the Fuel channels 30 a to 30 c to the injection opening. 7 supplied fuel is sprayed.

If the coil current is turned off, the armature 20 drops sufficient reduction of the magnetic field by the pressure of the Return spring 23 from the inner pole 13, causing the with the valve needle 3 operatively connected flange 21st moved against the stroke direction. The valve needle 3 is thereby moved in the same direction, causing the Valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.

Fig. 2 shows an illustration only in the area of Section III of Fig. 1 of an inventive Fuel injector 1 different fuel injector 31 according to the prior art with a Sealing ring 33 in a detail that the neckline III of Fig. 1 corresponds. The fuel injection valve 31 has a circumferential groove 32 shown here in cross-section, in which a sealing ring 33 is located. This sealing ring 33 seals the annular gap 34 between the fuel injection valve 31st and a receiving bore 39 of the cylinder head 1b, from a combustion chamber, not shown. A circumferential elevation 36 in the groove 32 supports the Sealing effect of the cross-section substantially rectangular Sealing ring 33.

If now the fuel injector 31 is not accurate aligned with the receiving bore 39, but to tolerances is mounted slightly tilted, is the Surface pressure of the sealing ring 33 uneven. Will the Angle too big, it can lead to leaks.

Fig. 3 shows the detail III of Fig. 1, a Inventive fuel injection valve 1 represents. Corresponding components are the same Provided with reference numerals.

The fuel injection valve 1 has the outer periphery his nozzle body 2, a groove 37 in which the sealing ring 1a lies. This sealing ring 1 a seals the annular gap 38, the between fuel injection valve 1 and receiving bore 39 the cylinder head 1b is not opposite one shown combustion chamber. A part spherical Contact surface 40 of the sealing ring 1a, which is concave in section is, acts with a corresponding part-spherical Counter surface 40a of the fuel injection valve 1 together.

The part-spherical surfaces 40, 40 a have, for example such a radius r on that the center point on a Center axis 41 of the fuel injection valve 1 and the Valve needle 3 is located.

If now the fuel injector 1 is not accurate aligned with the receiving bore 39, but to tolerances compensate is tilted at an angle α is tilted the surface pressure of the sealing ring 1a continues to be uniform. Slip on the part-spherical surfaces 40,40a Fuel injection valve 1 and sealing ring 1a in a adapted position, without causing a squeezing of the Sealing ring 1a comes because the center of rotation of the teilkugelförmnigen surfaces 40,40a exactly on the central axis 41 of the receiving bore 39 and thus at the pivot point of a Tilting by the angle α is. This is up to relative large angles possible. Preferably, the sealing ring 1a made of Teflon®. On the other hand, for the Sealing ring 1a also other known sealing materials, such as Elastomer materials are used.

The part-spherical mating surface 40a of the Fuel injection valve 1 can be particularly inexpensive be prepared by the nozzle body 2 and a Valve seat support is provided as Blechtiefziehteil, at the part-spherical mating surface 40a, for example is formed by rolling.

Fig. 4 shows in an enlarged view accordingly of section III in Fig. 1 another inventive Execution of a fuel injection valve 1 with a Sealing ring 1a, in the formation of the sealing ring 1a differs. Therefore, here are corresponding to each other Components provided with the same reference numerals.

The fuel injection valve 1 has the outer periphery his nozzle body 2, a groove 37 in which the sealing ring 1a lies. This sealing ring 1 a seals the annular gap 38, the between fuel injection valve 1 and receiving bore 39 the cylinder head 1b is not opposite one shown combustion chamber. The sealing ring 1a has in one combustion chamber side in the annular gap 38 between receiving bore 39 and fuel injector 1 lying surface a circumferential lower groove 42. In a brennraumabgewand in the annular gap 38 between receiving bore 39 and Fuel injector 1 lying surface has the Seal 1 a circumferential upper groove 43. Upper groove 43 and lower groove 42 are in the example set forth herein executed in each case about ¼ of the height of the sealing ring 1a. A part-spherical mating surface 40a of the Fuel injection valve 1 acts with a corresponding part spherical contact surface 40 of the sealing ring 1a, which in Section is concave, together. The radius r of both surfaces 40,40a is chosen so that the center on a Center axis 41 of the fuel injection valve 1 and the Valve needle 3 is located.

Therefore, the fuel injector 1 can control tolerances compensate to be mounted tilted at an angle α. Through the lower groove 42, the surface pressure in the lower Section of the part-spherical contact surface 40 and Counter surface 40 a increases when in the lower groove 42 over the Annular gap 38 of the combustion chamber pressure can act. This increases the sealing effect. By lower groove 42 and upper groove 43rd also the risk of deformation of the sealing ring 1a is at the tilting is reduced by the angle α, since by one to produce sufficient sealing effect, not so high Preload by the elastic deformation of the sealing ring 1a is necessary and part spherical contact surface 40 and Counter surface 40a can slide on each other easier. Yet sufficiently high surface pressures can be achieved in order to to prevent a breakthrough of combustion gases.

Claims (9)

  1. Fuel injection valve (1) which can be inserted into a receiving bore (39) in a cylinder head (1b) of an internal combustion engine, having a sealing ring (1a) which is arranged around the circumference of the fuel injection valve (1) in the receiving bore (39), characterized in that the sealing ring (1a) has a hemispherical contact face (40) making contact with the fuel injection valve (1), said contact face (40) bearing against a corresponding hemispherical counter-face (40a) on the fuel injection valve (1).
  2. Fuel injection valve according to Claim 1, characterized in that the hemispherical contact face (40) of the sealing ring (1a) is concave in cross section.
  3. Fuel injection valve according to Claim 1 or 2, characterized in that the sealing ring (1a) has a circumferential lower groove (42) in a face located on the combustion chamber side in an annular gap (38) between the receiving bore (39) and fuel injection valve (1).
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the sealing ring (1a) has a circumferential upper groove (43) in a face located facing away from the combustion chamber in an annular gap (38) between the receiving bore (39) and fuel injection valve (1).
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that the radius (r) of the hemispherical contact face (40) of the sealing ring (1a) and the radius (r) of the hemispherical counter-face (40a) of the fuel injection valve (1) are dimensioned in such a way that the pivot point of these hemispherical faces (40, 40a) lies on a central axis (41) of the fuel injection valve (1).
  6. Fuel injection valve according to one of the preceding claims, characterized in that the sealing ring (1a) is arranged in a circumferential groove (37) on the fuel injection valve (1).
  7. Fuel injection valve according to Claim 6, characterized in that the groove (37) is shaped so as to receive the sealing ring (1a) on a nozzle body (2) or a valve seat carrier.
  8. Fuel injection valve according to Claim 7, characterized in that the nozzle body (2) or valve seat carrier is designed as a deep-drawn part on which the hemispherical counter-face (40a) of the fuel injection valve (1) is formed.
  9. Fuel injection valve according to one of the preceding claims, characterized in that the sealing ring (1a) is composed of Teflon®.
EP20010955272 2000-08-05 2001-07-20 Fuel injection valve Expired - Fee Related EP1309795B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2000138300 DE10038300A1 (en) 2000-08-05 2000-08-05 Fuel injector
DE10038300 2000-08-05
PCT/DE2001/002764 WO2002012717A1 (en) 2000-08-05 2001-07-20 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1309795A1 EP1309795A1 (en) 2003-05-14
EP1309795B1 true EP1309795B1 (en) 2005-11-30

Family

ID=7651457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010955272 Expired - Fee Related EP1309795B1 (en) 2000-08-05 2001-07-20 Fuel injection valve

Country Status (10)

Country Link
US (1) US6615802B2 (en)
EP (1) EP1309795B1 (en)
JP (1) JP5231705B2 (en)
KR (1) KR20020037058A (en)
CN (1) CN1237267C (en)
BR (1) BR0107072A (en)
CZ (1) CZ20021160A3 (en)
DE (2) DE10038300A1 (en)
RU (1) RU2270930C2 (en)
WO (1) WO2002012717A1 (en)

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US7004476B2 (en) 2000-10-13 2006-02-28 Nok Corporation Combustion gas seal for injector
US6938901B2 (en) 2000-12-26 2005-09-06 Toyota Jidosha Kabushiki Kaisha Combustion gas seal for injector and sealing structure with the combustion gas seal
DE10321163B4 (en) * 2003-05-12 2017-01-05 Robert Bosch Gmbh Method for attaching a metallic sealing element to a base body of a fuel injection valve, and fuel injection valve
JP4267433B2 (en) * 2003-11-25 2009-05-27 Nok株式会社 Combustion gas seal for fuel injection valve
AT329149T (en) * 2004-03-11 2006-06-15 Delphi Tech Inc Method for assembling a fuel injection valve
DE102005006818A1 (en) * 2005-02-15 2006-08-17 Volkswagen Mechatronic Gmbh & Co. Kg Sealing device for a fuel injector and method for sealing
DE102006048727A1 (en) * 2006-10-16 2008-04-17 Robert Bosch Gmbh Fuel injector with solenoid valve
BRPI0807545A2 (en) * 2007-05-02 2014-06-17 Bosch Gmbh Robert Internal combustion engine with seal protection for a fuel injection valve
DE602008003515D1 (en) * 2008-01-18 2010-12-30 Continental Automotive Gmbh Valve arrangement for an injection valve and injection valve
US7942132B2 (en) 2008-07-17 2011-05-17 Robert Bosch Gmbh In-line noise filtering device for fuel system
EP2148082B1 (en) * 2008-07-24 2011-10-19 Continental Automotive GmbH Coupling arrangement for an injection valve and injection valve
DE102009045692A1 (en) * 2009-10-14 2011-04-21 Robert Bosch Gmbh Method for mounting a sealing ring
CN103403333B (en) * 2011-02-10 2015-10-21 本田技研工业株式会社 The sealing configuration of fuel tank and possess the vehicle of sealing configuration of this fuel tank
EP2607679B1 (en) * 2011-12-21 2015-02-25 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
JP5867158B2 (en) * 2012-02-24 2016-02-24 Nok株式会社 Sealing structure
DE102012209353B4 (en) 2012-06-04 2018-12-06 Continental Automotive Gmbh Test device for testing a printed circuit board
JP5831510B2 (en) 2012-11-20 2015-12-09 株式会社デンソー Fuel injection valve and fuel injection valve mounting method
WO2014126243A1 (en) * 2013-02-18 2014-08-21 Nok株式会社 Sealing structure
JP5910586B2 (en) * 2013-08-23 2016-04-27 株式会社デンソー Fuel injection valve
KR101686405B1 (en) * 2015-06-19 2016-12-16 주식회사 태하 Dispenser having function of depressing ball up and remained pressure
DE102018221403A1 (en) 2018-12-11 2020-06-18 Robert Bosch Gmbh Fuel injector

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US4938193A (en) * 1987-06-15 1990-07-03 Stanadyne Automotive Corp. Fuel injection nozzle
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Also Published As

Publication number Publication date
EP1309795A1 (en) 2003-05-14
CN1237267C (en) 2006-01-18
JP5231705B2 (en) 2013-07-10
KR20020037058A (en) 2002-05-17
WO2002012717A1 (en) 2002-02-14
US6615802B2 (en) 2003-09-09
CN1386168A (en) 2002-12-18
US20020179057A1 (en) 2002-12-05
DE50108253D1 (en) 2006-01-05
DE10038300A1 (en) 2002-02-14
BR0107072A (en) 2002-06-25
RU2270930C2 (en) 2006-02-27
JP2004506135A (en) 2004-02-26
CZ20021160A3 (en) 2003-09-17

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