WO1999027246A1 - Brennstoffeinspritzventil und verfahren zur herstellung einer ventilnadel eines brennstoffeinspritzventils - Google Patents
Brennstoffeinspritzventil und verfahren zur herstellung einer ventilnadel eines brennstoffeinspritzventils Download PDFInfo
- Publication number
- WO1999027246A1 WO1999027246A1 PCT/DE1998/002434 DE9802434W WO9927246A1 WO 1999027246 A1 WO1999027246 A1 WO 1999027246A1 DE 9802434 W DE9802434 W DE 9802434W WO 9927246 A1 WO9927246 A1 WO 9927246A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- closing body
- valve
- carrier
- valve closing
- body carrier
- Prior art date
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors 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
- F02M51/0667—Injectors 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 acting as a valve or having a short valve body attached thereto
-
- 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
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors 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
- F02M51/0671—Injectors 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
- F02M51/0682—Injectors 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 the body being hollow and its interior communicating with the 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
- 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
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
Definitions
- the invention relates to a fuel injector according to the preamble of claim 1 and a method for producing a valve needle of a fuel injector according to the preamble of claim 12.
- a valve needle is formed from an armature, a tubular connecting part and a spherical valve closing body.
- the armature and the valve closing body are connected to one another via the tubular connecting part, the connecting part, with which the valve closing body is firmly connected by means of a weld seam, serving as the direct closing body carrier.
- the connecting part has a multiplicity of transverse flow openings through which fuel can emerge from an inner through opening and can flow outside the connecting part to the valve closing body or to a valve seat surface which interacts with the valve closing body.
- the connecting tube has a running over the entire length Longitudinal slot through which fuel can flow very quickly coming from the inner through opening due to its large hydraulic flow cross-section. Most of the fuel to be sprayed already flows out of the connecting part over the length thereof. The remaining amount only emerges from the connecting part directly on the ball surface, so that, seen over the 360 ° connecting area of the connecting part and valve closing body, there is a clear fuel uneven distribution.
- the fuel injector according to the invention with the characterizing features of claim 1 and the method according to claim 12 has the advantage that in a particularly simple manner inexpensive and reliable
- the valve needle comprises at least one closing body carrier and one valve closing body.
- Closing body support is formed at its end facing the valve closing body so deviating from an annular profile that at least two flow openings are formed between the closing body support and the surface of the valve closing body, through which fuel can flow unhindered coming from an inner longitudinal bore towards a valve seat surface.
- the downstream end of the closing body carrier is plastically deformed from a circular ring profile into a polygonal profile by means of deformation tools. Optimal inflow to the metering area of the valve is achieved with little manufacturing effort.
- the fuel advantageously flows up to the surface of the valve closing body in the interior of the closing body carrier.
- valve closing body is spherical, so that the valve closing body can be centered particularly easily on the closing body carrier.
- the polygonal profile of the closing body support has the same number of corner areas and edge areas, which corresponds to the number of flow openings. With a triangular profile, the best compromise results from the largest possible free cross section of the sum of the flow openings and good centering of the valve closing body on
- Striker body By using different deformation tools, individual profiles of the striker beams can be manufactured very variably.
- the armature can itself serve directly as a closing body carrier, so that a two-part valve needle is present together with the valve closing body.
- a valve needle is particularly simple and inexpensive to manufacture and has the reduced Number of parts only the connection to be achieved between valve closing body and closing body carrier.
- FIG. 1 shows a fuel injector according to the invention
- FIG. 2 shows an armature as a closing body support with a deformation tool
- FIG. 3 shows a two-part valve needle
- FIG. 4 shows a section through a closing body support with a triangular profile along the line IV-IV in FIG. 3
- FIG. 5 shows a section through a closing body support with a pentagonal profile
- FIG. 6 shows a three-part valve needle
- FIGS. 7, 8 and 9 can be fastened to a closing body carrier and deviate from a spherical valve closing body.
- the valve according to the invention shown in FIG. 1 by way of example and partly in simplified form, in the form of an electromagnetically actuated fuel injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a largely tubular core 2 surrounded by a magnetic coil 1, serving as an inner pole and partly as a fuel flow Upper, disc-shaped cover element 3, the core 2 enables a particularly compact structure of the injection valve in the area of the
- the magnetic coil 1 is surrounded by an outer, ferromagnetic valve jacket 5 as the outer pole, which completely surrounds the magnetic coil 1 in the circumferential direction and at its upper end firmly with the cover element 3 z. B. is connected by a weld 6.
- the valve jacket 5 is designed stepped at its lower end, so that a guide section 8 is formed which axially encloses the magnet coil 1 similar to the cover element 3 and which represents the boundary of the magnet coil region 1 downwards or in the downstream direction.
- the guide section 8 of the valve jacket 5, the magnet coil 1 and the cover element 3 form an inner opening 11 or 58, which extends concentrically to a longitudinal valve axis 10 and in which an elongated sleeve 12 extends.
- An inner longitudinal opening 9 of the ferritic sleeve 12 serves in part as a guide opening for a valve needle 13 that is axially movable along the longitudinal valve axis 10.
- the sleeve 12 is therefore made to size with respect to the inner diameter of the inner opening 9.
- the sleeve 12 ends viewed in the downstream direction, for example in the region of the guide section 8 of the valve jacket 5, with which it is fixedly connected, for example, with a weld seam 54.
- the fixed core 2 is also arranged in the longitudinal opening 9 of the sleeve 12.
- the sleeve 12 also fulfills a sealing function, so that a dry magnet coil 1 is present in the injection valve. This is also achieved in that the disc-shaped cover 3
- Solenoid 1 completely covered on its upper side.
- the inner opening 58 in the cover element 3 allows the sleeve 12 and thus also the core 2 to be elongated, so that both components protrude through the opening 58 beyond the cover element 3.
- a valve seat body 14 adjoins the lower guide section 8 of the valve jacket 5 and has a fixed valve seat surface 15 as the valve seat.
- the valve seat body 14 is, for example, with a of a laser generated second weld 16 is firmly connected to the valve jacket 5.
- the valve needle 13 is formed by a tubular armature 17 and a, for example spherical valve closing body 18 firmly connected thereto, the armature 17 directly as
- Closing body carrier serves.
- the valve closing body 18 has, for example, five flats 23 on its circumference, by which a fuel flow past the valve closing body 18 to the valve seat surface 15 is permitted.
- On the downstream end face of the valve seat body 14 is, for. B. in a recess 19 a flat spray plate 20, the fixed connection of valve seat body 14 and spray plate 20 z. B. is realized by a circumferential dense weld 21.
- the injection valve is actuated electromagnetically in a known manner.
- the electromagnetic circuit with the solenoid 1, the inner core 2, the outer valve jacket 5 and the armature 17 is used.
- the armature 17 is connected to the the valve closing body 18 facing away from the core 2.
- the spherical valve closing body 18 interacts with the valve seat surface 15 of the valve seat body 14 which tapers in the shape of a truncated cone in the flow direction and is formed in the axial direction downstream of a guide opening 26 in the valve seat body 14.
- the spray plate 20 has at least one, for example four through
- the insertion depth of the core 2 in the injection valve is, among other things, decisive for the stroke of the valve needle 13.
- the one end position of the valve needle 13 is not at excited solenoid 1 by the contact of the valve closing body 18 on the valve seat 15 of the valve seat body 14, while the other end position of the valve needle 13 when the solenoid 1 is excited by the contact of the armature 17 at the downstream end of the
- Kerns 2 results.
- the stroke is adjusted by axially displacing the core 2 in the sleeve 12, which is subsequently firmly connected to the sleeve 12 in accordance with the desired position, laser welding being useful for achieving a weld seam 22.
- an adjusting sleeve 29 is inserted into a flow bore 28 of the core 2, which runs concentrically with the valve longitudinal axis 10 and serves to supply the fuel in the direction of the valve seat surface 15.
- the adjusting sleeve 29 is used to adjust the spring preload of the return spring 25 abutting the adjusting sleeve 29, which in turn is supported with its opposite side on a shoulder 28 of the armature 17, the dynamic injection quantity also being adjusted using the adjusting sleeve 29.
- Such an injection valve is distinguished by its particularly compact construction, so that a very small, handy injection valve is produced, the valve jacket 5 of which has an outer diameter of only about 11 mm, for example.
- the components described so far form a preassembled independent assembly, which can be referred to as functional part 30.
- the fully set and assembled functional part 30 has z. B. on an upper end face 32, for example, two contact pins 33 protrude.
- the electrical contacting of the magnetic coil 1 and thus its excitation takes place via the electrical contact pins 33, which serve as electrical connecting elements.
- a connection part (not shown) can be connected, which is characterized above all by the fact that it ate the electrical and hydraulic connection of the injection valve.
- connection part (not shown) and the functional part 30 is achieved in the fully assembled injection valve in that flow bores of both assemblies are brought together so that an unimpeded flow of fuel is ensured. It is then z. B. the end face 32 of the functional part 30 directly to a lower end face of the connecting part and is firmly connected to this.
- the connection part is mounted on the functional part 30, the part of the core 2 and the sleeve 12 projecting beyond the end face 32 can protrude into a flow bore of the connection part in order to increase the connection stability.
- a sealing ring 36 is provided, which rests on the end face 32 of the cover 3, the sleeve 12.
- the contact pins 33 serving as electrical connecting elements enter into a secure electrical connection in the completely assembled valve with corresponding electrical connecting elements of the connecting part.
- FIG. 2 shows the armature or closing body support 17 on a larger scale than in FIG. 1 with a deformation tool 40 or 41 has stepped outer contour.
- the closing body carrier 17, which is made, for example, of a ferritic material (for example 13% chromium steel), has an upper stop surface 42 facing the core 2, which also has a wear protection layer is provided, e.g. B. is chrome-plated.
- Valve needle 13 in the sleeve 12 is used. Similar to the step 28 in the inner longitudinal bore 45, a step 46 is provided on the outer contour, which results in a reduction in cross-section in a second section 48 when viewed in the downstream direction. Sections 47 and 48 of larger and smaller outer diameters each initially have a circular cross section.
- the circular cross section of the end of the closing body support 17 facing the spherical valve closing body 18, that is to say section 48 in the exemplary embodiment according to FIG. 2 is changed to a cross section which has at least two corners 60 and edges 61 (FIG. 4).
- the corners 60 or the edges 61 do not have to be sharp-edged or straight. Rather, the corners 60 can be rounded and the edges 61 curved, that is to say bulbous.
- a plastic deformation of the connection area, to which the valve closing body 18 to be fastened later is attached is carried out in section 48.
- the second deformation option provides a deformation tool 41 on the outer circumference of section 48 to act to achieve a desired deformation of the section 48.
- a form stamp can be inserted both into the inner longitudinal bore 45 and a deformation tool 41 can be attached to the outer circumference, with which the contour of the form stamp is reproduced in section 48.
- the spherical valve closing body 18 is firmly attached to this deformed section 48, as a result of which the axially movable valve needle 13 is completed, as can be seen in FIG. 3.
- the valve closing body 18 is attached to the respective edge regions 61 'of the deformed profile, with no fixed ones in the corner regions 60' in the desired manner
- the fixed connections between the closing body support 17 and the valve closing body 18 are realized, for example, by weld seams 63 generated by means of laser, the number of weld seams 63 corresponding exactly to the number of edge regions 61 ′.
- the formation of the corner regions 60 ′ creates regions at the downstream end of the section 48 which do not lie against the surface of the valve closing body 18.
- the plastic deformation of section 48 has therefore resulted in flow openings 65 being formed at the corner regions 60 ′, through which fuel coming from the longitudinal bore 45 flows in a particularly favorable manner in the direction of the valve seat surface 15.
- This design of the valve needle 13 enables a very simple inflow of the fuel to the metering area of the injection valve.
- Figure 4 is a sectional view of a section along the line IV-IV in Figure 3, which is particularly vivid Corners 60 and the edges 61 of the closing body support 17 and the flow openings 65 after the valve closing body 18 has been attached are illustrated. It is particularly advantageous to use deformation tools 40, 41 with shaping dies with which a triangular profile can be produced.
- FIG. 6 shows a second exemplary embodiment of a valve needle 13, in which the parts that are the same or have the same effect as the exemplary embodiment shown in FIG. 3 are identified by the same reference numerals.
- the valve needle 13 according to FIG. 6 is distinguished from the valve needle 13 shown in FIG. 3 by its three parts.
- the armature 17 and the valve closing body 18 are connected to one another via a sleeve-shaped connecting part 50.
- valve closing body 18 is also, as described above, fixed by means of weld seams 63
- Valve needle 13 is provided, but here not with the armature 17, but with the connecting part 50 which now serves as the closing body carrier. All statements regarding the deformation of the section 48 on the closing body carrier 17 of the example according to FIG. 2 are completely related to the connecting part 50 of the example according to FIG. 6, since there is a comparable geometry and function.
- valve closing body 18 is particularly preferred due to the simple centering, but is not exclusive. Rather, it is also possible to use a cylindrical shape with a spherical grind (FIG. 7), a cylindrical shape with a cone tip (FIG. 8), a cylindrical shape with two opposite cone tips (FIG. 9), hemispherical and others.
- Valve closing body 18 are attached to the closing body support 17, 50.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/355,121 US6199776B1 (en) | 1997-11-22 | 1998-08-20 | Fuel injection valve and method for the production of a valve needle for a fuel injection valve |
EP98949924A EP0954696B1 (de) | 1997-11-22 | 1998-08-20 | Brennstoffeinspritzventil und verfahren zur herstellung einer ventilnadel eines brennstoffeinspritzventils |
DE59808457T DE59808457D1 (de) | 1997-11-22 | 1998-08-20 | Brennstoffeinspritzventil und verfahren zur herstellung einer ventilnadel eines brennstoffeinspritzventils |
JP52729699A JP2001509855A (ja) | 1997-11-22 | 1998-08-20 | 燃料噴射弁及び燃料噴射弁の弁ニードルを製造する方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19751847A DE19751847A1 (de) | 1997-11-22 | 1997-11-22 | Brennstoffeinspritzventil und Verfahren zur Herstellung einer Ventilnadel eines Brennstofeinspritzventils |
DE19751847.8 | 1997-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999027246A1 true WO1999027246A1 (de) | 1999-06-03 |
Family
ID=7849551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/002434 WO1999027246A1 (de) | 1997-11-22 | 1998-08-20 | Brennstoffeinspritzventil und verfahren zur herstellung einer ventilnadel eines brennstoffeinspritzventils |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0954696B1 (de) |
JP (1) | JP2001509855A (de) |
DE (2) | DE19751847A1 (de) |
WO (1) | WO1999027246A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006020689A1 (de) * | 2006-05-04 | 2007-11-08 | Robert Bosch Gmbh | Magnetventil mit stoffschlüssiger Ankerverbindung |
DE102010040910A1 (de) * | 2010-09-16 | 2012-03-22 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE102010040898A1 (de) | 2010-09-16 | 2012-03-22 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4483485A (en) * | 1981-12-11 | 1984-11-20 | Aisan Kogyo kabuskiki Kaisha | Electromagnetic fuel injector |
JPS6287661A (ja) * | 1985-10-15 | 1987-04-22 | Diesel Kiki Co Ltd | 電磁式燃料噴射弁 |
DE3831196A1 (de) | 1988-09-14 | 1990-03-22 | Bosch Gmbh Robert | Elektromagnetisch betaetigbares ventil |
US4967966A (en) * | 1988-07-23 | 1990-11-06 | Robert Bosch Gmbh | Electromagnetically actuatable valve |
DE4008675A1 (de) | 1990-03-17 | 1991-09-19 | Bosch Gmbh Robert | Elektromagnetisch betaetigbares ventil |
-
1997
- 1997-11-22 DE DE19751847A patent/DE19751847A1/de not_active Withdrawn
-
1998
- 1998-08-20 EP EP98949924A patent/EP0954696B1/de not_active Expired - Lifetime
- 1998-08-20 WO PCT/DE1998/002434 patent/WO1999027246A1/de active IP Right Grant
- 1998-08-20 JP JP52729699A patent/JP2001509855A/ja active Pending
- 1998-08-20 DE DE59808457T patent/DE59808457D1/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4483485A (en) * | 1981-12-11 | 1984-11-20 | Aisan Kogyo kabuskiki Kaisha | Electromagnetic fuel injector |
JPS6287661A (ja) * | 1985-10-15 | 1987-04-22 | Diesel Kiki Co Ltd | 電磁式燃料噴射弁 |
US4967966A (en) * | 1988-07-23 | 1990-11-06 | Robert Bosch Gmbh | Electromagnetically actuatable valve |
DE3831196A1 (de) | 1988-09-14 | 1990-03-22 | Bosch Gmbh Robert | Elektromagnetisch betaetigbares ventil |
DE4008675A1 (de) | 1990-03-17 | 1991-09-19 | Bosch Gmbh Robert | Elektromagnetisch betaetigbares ventil |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 11, no. 295 (M - 626) 24 September 1987 (1987-09-24) * |
Also Published As
Publication number | Publication date |
---|---|
DE19751847A1 (de) | 1999-05-27 |
DE59808457D1 (de) | 2003-06-26 |
EP0954696B1 (de) | 2003-05-21 |
JP2001509855A (ja) | 2001-07-24 |
EP0954696A1 (de) | 1999-11-10 |
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