EP1034369A1 - Brennstoffeinspritzventil - Google Patents
BrennstoffeinspritzventilInfo
- Publication number
- EP1034369A1 EP1034369A1 EP99923396A EP99923396A EP1034369A1 EP 1034369 A1 EP1034369 A1 EP 1034369A1 EP 99923396 A EP99923396 A EP 99923396A EP 99923396 A EP99923396 A EP 99923396A EP 1034369 A1 EP1034369 A1 EP 1034369A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- closing body
- valve
- valve seat
- areas
- fuel injection
- 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
- 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
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
Definitions
- the invention relates to a fuel injector according to the preamble of the main claim.
- a fuel injector in the form of an electromagnetically actuated valve is already known from DE-PS 38 31 196, in which 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.
- the connecting part has a multiplicity of flow openings, through which fuel can emerge from an inner through opening and can flow outside the connecting part as far as the valve closing body or to a valve seat surface which interacts with the valve closing body.
- the connecting pipe has a longitudinal slot running over the entire length, 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 flows out of the connecting part over the length of the connecting part, while a small remaining amount only emerges from the connecting part at the spherical surface.
- the fuel injector according to the invention with the characterizing features of the main claim has the advantage that it is inexpensive to manufacture in a particularly simple manner. It is particularly advantageous that very precise guidance of the valve needle is achieved with little effort.
- valve closing body Since the spherical valve closing body, which is easy to produce with regard to its roundness, serves the lower guide of the axially movable valve needle and a guide opening on the material areas of the valve seat body together with the valve seat surface can be produced very precisely with little effort, precise guidance of the valve needle is relatively simple. high so-called concentricity of the ball as valve closing body).
- the valve closing body itself serves for the axial guidance of the valve needle and not, as in known valve needles, the closing body carrier. In such known valve needles, complex guide surfaces have to be formed on the closing body carrier.
- the material sections of the end region of the closing body carrier and the material regions of the valve seat body are shaped in such a way that they fit into one another with dimensional accuracy at least in a horizontal plane.
- the flow areas are advantageously formed by chamfering the side flanks of the material sections of the end area and / or the material areas.
- the closing body carrier can advantageously be designed as a cold-pressed part.
- FIG. 1 shows a fuel injector according to the invention
- FIG. 2 shows a section along the line II-II in FIG. 1
- FIG. 3 shows a section along the line III-III in FIG. 1.
- Injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a largely tubular core 2, which is surrounded by a magnet coil 1, serves as an inner pole and partially serves as fuel flow. Together with an upper, disk-shaped cover element 3, the core 2 enables a particularly compact structure of the injection valve in the area of the magnet coil 1.
- the solenoid 1 is surrounded by an outer, ferromagnetic valve jacket 5 as an outer pole, which completely surrounds the solenoid 1 in the circumferential direction and at its upper end with the cover 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, similar to the cover element 3
- Magnetic coil 1 axially encloses and which represents the boundary of the magnetic 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, for example, an elongated sleeve 12 extends.
- An inner longitudinal opening 9 of the ferritic sleeve 12 partially serves as a guide opening for one along the Longitudinal valve axis 10 axially movable valve needle 13.
- 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 one
- valve seat body 14 designed according to the invention, which has a fixed valve seat surface 15 as the valve seat.
- the valve seat body 14 is fixedly connected to the valve jacket 5 by means of a second weld 16, for example generated by a laser.
- the valve needle 13 is formed by a tubular armature 17 and a spherical valve closing body 18, the armature 17 serving directly as a closing body carrier.
- On the downstream end face of the valve seat body 14 is, for. B. in a recess 19 a flat spray plate 20 is arranged, the fixed connection of valve seat body 14 and spray plate 20 z. B. is realized by a circumferential dense weld 21.
- the tubular armature 17 is spherical at its downstream end facing the spray orifice plate 20 Valve closing body 18, for example, firmly connected by flanging.
- the injection valve is actuated electromagnetically in a known manner. For the axial movement of the
- Valve needle 13 and thus for opening against the spring force of a return spring 25 or closing the injection valve, the electromagnetic circuit with the magnet coil 1, the inner core 2, the outer valve jacket 5 and the armature 17 is used.
- the armature 17 is facing away from the valve closing body 18 End aligned to core 2.
- the spherical valve closing body 18 acts with the e.g. together frusto-conical valve seat surface 15 of the valve seat body 14, which is formed in the axial direction downstream of a guide opening 26 in the valve seat body 14 for guiding the valve closing body 18.
- the spray orifice plate 20 has at least one, for example four, spray openings 27 formed by eroding or stamping.
- 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 when the magnet coil 1 is not excited is due to the system of the
- Valve closing body 18 fixed to the valve seat surface 15 of the valve seat body 14, while the other end position of the valve needle 13 results when the solenoid coil 1 is excited due to the contact of the armature 17 at the downstream end of the core 2.
- 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 24 of an inner longitudinal bore 23 of the armature 17, the dynamic injection quantity also being adjusted using the adjusting sleeve 29.
- Such an injection valve is characterized by its particularly compact structure.
- 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.
- connection part not shown
- connection part (not shown) and the functional part 30 is achieved in the case of the fully assembled injection valve in that
- connection part Flow bores of both assemblies are brought together so that an unimpeded flow of fuel is guaranteed. It is then z. B. the end face 32 of the functional part 30 directly on a lower end face of the connecting part and is fixed to it connected.
- 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 fully assembled valve with corresponding electrical connecting elements of the connection part.
- the inner longitudinal bore 23 in the armature 17, which is stepped due to the shoulder 24, has a largely circular cross section.
- the inner longitudinal bore 23 has a conical shoulder 45, through which the longitudinal bore 23 widens in the downstream direction and which serves as a stop for the valve closing body 18.
- an end region 46 of the armature 17 extends along the outer circumference of the spherical valve closing body 18, both the shoulder
- the spherical valve closing body 18 has a spherical equator 48 running perpendicular to the longitudinal axis 10 of the valve, up to or over which the end region 46 extends as seen in the downstream direction. In other words, at least one hemisphere and thus the radius of the spherical valve closing body 18 are encompassed by the armature 17 as the closing body carrier.
- valve closing body 46 has a larger outer diameter than the valve closing body 18.
- the fixed connection of, for example, as Cold-pressed part present closing body carrier 17 and valve closing body 18 is achieved, for example, by flanging or pressing or by pressing in and subsequent flanging, the encompassing region downstream of the ball equator 48, above all, ensuring a secure connection.
- At least three opening areas 49 are formed in the end area 46 over the circumference thereof, which, starting from the longitudinal bore 23, have an axial extension component and are partially flowed through by the fuel in the direction of the valve seat surface 15, the fuel supplied in the longitudinal bore 23 largely flows along the surface of the sphere.
- An equal number of material areas 51 of the valve seat body 14 protrude into the opening areas 49 of the closing body carrier 17 at its end area 46 in accordance with the number of opening areas 49.
- Closing body carrier 17 with three material sections 50 for example. Since the spherical valve closing body 18, which can be easily produced with regard to its roundness, serves for the lower guide of the valve needle 13 and the guide opening 26 on the material areas 51 together with the valve seat surface 15 can be produced very precisely with little effort, very precise guidance of the Valve needle 13 (high so-called concentricity of the ball 18) reached. At acquaintances Valve needles, on the other hand, have to be formed on complex guide surfaces on the closing body carrier.
- FIGS. 2 and 3 which show sections along lines II-II and III-III in FIG. 1, the circumferentially alternating intermeshing of the material sections 50 of the end region 46 of the closing body carrier 17 and the material regions 51 of the valve seat body 14 is particularly clear. It can be seen from Figure 2 that in the plane of the spherical equator 48, the material sections 50 of the
- End region 46 and the material regions 51 are spaced apart from one another, so that slot-shaped throughflow regions 55 are formed, through which the fuel can flow in a streaked manner to the valve seat surface 15.
- the variant shown, each with three alternating material sections 50 of the end area 46 and material areas 51, represents only one possible embodiment; it is also e.g. four, five or six successive regions 46, 51 can be formed in the circumferential direction.
- Material sections 50 of the end region 46 and / or the material regions 51 arise, keep a constant size and do not vary in the circumferential direction. It is sufficient if a material section 50 of the closing body carrier 17 is dimensionally accurate in a material recess 52 of the Valve seat body 14 fits in, with which the desired anti-rotation is already achieved. A beam geometry change over the life of the valve is effectively excluded.
- the curvature of the spherical valve closing body 1E provides an annular flow area 56 from which the flow through the flow-through areas 55, which widen in the axial direction, takes place.
- the closing body support 17 In addition to the design of the closing body support 17 as a cold pressed part, designs as a turned part, sintered part or MIM (metal injection molding) part are also possible.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19829422 | 1998-07-01 | ||
DE19829422A DE19829422A1 (de) | 1998-07-01 | 1998-07-01 | Brennstoffeinspritzventil |
PCT/DE1999/000879 WO2000001942A1 (de) | 1998-07-01 | 1999-03-25 | Brennstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1034369A1 true EP1034369A1 (de) | 2000-09-13 |
EP1034369B1 EP1034369B1 (de) | 2003-06-04 |
Family
ID=7872652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99923396A Expired - Lifetime EP1034369B1 (de) | 1998-07-01 | 1999-03-25 | Brennstoffeinspritzventil |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1034369B1 (de) |
JP (1) | JP2002519586A (de) |
BR (1) | BR9906570A (de) |
DE (2) | DE19829422A1 (de) |
ES (1) | ES2201717T3 (de) |
WO (1) | WO2000001942A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4082929B2 (ja) * | 2002-05-21 | 2008-04-30 | 株式会社日立製作所 | 燃料噴射弁 |
DE102006025343A1 (de) * | 2006-03-22 | 2007-09-27 | Robert Bosch Gmbh | Magnetspule |
JP6216208B2 (ja) | 2013-10-22 | 2017-10-18 | 日本パーカライジング株式会社 | 塑性加工用非りん化成処理剤、処理液、化成皮膜及び化成皮膜を有する金属材料 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56107956A (en) * | 1980-01-30 | 1981-08-27 | Hitachi Ltd | Solenoid fuel injection valve |
DE3831196A1 (de) | 1988-09-14 | 1990-03-22 | Bosch Gmbh Robert | Elektromagnetisch betaetigbares ventil |
DE3939093A1 (de) * | 1989-11-25 | 1991-05-29 | Bosch Gmbh Robert | Elektromagnetisch betaetigbares kraftstoffeinspritzventil |
DE19503224A1 (de) * | 1995-02-02 | 1996-08-08 | Bosch Gmbh Robert | Elektromagnetisch betätigbares Einspritzventil für Kraftstoffeinspritzanlagen von Verbrennungsmotoren |
DE19712589C1 (de) * | 1997-03-26 | 1998-06-04 | Bosch Gmbh Robert | Brennstoffeinspritzventil und Verfahren zur Herstellung einer Ventilnadel eines Brennstoffeinspritzventils |
-
1998
- 1998-07-01 DE DE19829422A patent/DE19829422A1/de not_active Withdrawn
-
1999
- 1999-03-25 DE DE59905828T patent/DE59905828D1/de not_active Expired - Lifetime
- 1999-03-25 WO PCT/DE1999/000879 patent/WO2000001942A1/de active IP Right Grant
- 1999-03-25 ES ES99923396T patent/ES2201717T3/es not_active Expired - Lifetime
- 1999-03-25 EP EP99923396A patent/EP1034369B1/de not_active Expired - Lifetime
- 1999-03-25 BR BR9906570-3A patent/BR9906570A/pt active Search and Examination
- 1999-03-25 JP JP2000558308A patent/JP2002519586A/ja not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0001942A1 * |
Also Published As
Publication number | Publication date |
---|---|
BR9906570A (pt) | 2000-09-19 |
DE19829422A1 (de) | 2000-01-05 |
WO2000001942A1 (de) | 2000-01-13 |
DE59905828D1 (de) | 2003-07-10 |
JP2002519586A (ja) | 2002-07-02 |
EP1034369B1 (de) | 2003-06-04 |
ES2201717T3 (es) | 2004-03-16 |
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