WO1996000348A1 - Pointeau de soupape dote d'un element filtrant - Google Patents

Pointeau de soupape dote d'un element filtrant Download PDF

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Publication number
WO1996000348A1
WO1996000348A1 PCT/DE1995/000742 DE9500742W WO9600348A1 WO 1996000348 A1 WO1996000348 A1 WO 1996000348A1 DE 9500742 W DE9500742 W DE 9500742W WO 9600348 A1 WO9600348 A1 WO 9600348A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve needle
filter element
fuel
section
Prior art date
Application number
PCT/DE1995/000742
Other languages
German (de)
English (en)
Inventor
Peter Romann
Ferdinand Reiter
Martin Maier
Manfred Dreyer
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
Publication of WO1996000348A1 publication Critical patent/WO1996000348A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • 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
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0651—One-way valve the fluid passing through the solenoid coil

Definitions

  • the invention is based on a valve needle according to the main claim. It is already known from DE-OS 40 03 228 a valve needle formed from an armature, a valve needle section and a valve closing body as an actuating part for opening and closing a fuel injection valve, in which, among other things, a fuel filter at the inlet end of the fuel injection valve valve is pressed into the fuel inlet connector.
  • the fuel filter ensures that those fuel components are filtered out which, because of their size, could cause blockages or damage in the injection valve.
  • This fuel filter is provided on the circumference, for example with a brass ring, which forms the pairing with the wall of the fuel inlet connection when the fuel filter is pressed in.
  • a disadvantage of this method is the occurrence of abrasion and shavings, which can be detached when pressed in due to the interference fit between the fuel filter and the fuel inlet connector, which simultaneously serves as a core, and then cause contamination in the injection valve.
  • Contamination inside the injection valve can also occur when inserting an adjusting sleeve into the flow bore of the core, due to wear of the abutment surfaces of the core and armature, or due to production-related burrs on various components of the injection valve arise.
  • This built-in or shaken-off dirt inside the injection valve cannot be prevented by the fuel filter at the inlet end of the fuel injection valve. As a result, in the most extreme case, blockages or leaks at the valve seat can occur, so that the injection valve is no longer fully functional.
  • valve needle according to the invention with the characterizing features of the main claim has the advantage that dirt which has been built in or formed in the interior of the injection valve is kept away from the valve seat, so that no effects of these particles on the
  • Leakage of the injection valve occurs in the area of the valve seat and blockages on the valve seat are excluded.
  • This is advantageously achieved in that a filter element integrated in or on the valve needle is provided in the injection valve, which keeps all particles and contaminants upstream of the valve seat in the interior of the injection valve away from the valve seat by being deposited on the filter element and thus the mentioned blockage ⁇ prevents valve seat.
  • FIG. 1 shows a fuel injection valve with a valve needle according to the invention
  • FIG. 2 shows a first exemplary embodiment of this valve needle
  • FIG. 3 4 shows a section along the line IV-IV in FIG. 3
  • FIG. 5 shows a third embodiment of a valve needle
  • FIG. 6 shows a section along the line VI-VI in FIG. 5
  • FIG. 7 shows a plan view of a valve needle according to FIG a fourth
  • FIG. 8 shows a section along the line VIII-VIII in FIG. 7
  • FIG. 9 shows a section along the line IX-IX in FIG. 8
  • FIG. 10 shows a section along the line XX in FIG. 8
  • FIG. 11 shows a fifth exemplary embodiment of a Valve needle.
  • the electromagnetic actuatable valve shown in FIG. 1, for example, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2, which is surrounded by a magnetic coil 1 and serves as a fuel inlet connection and has a constant outer diameter, for example, over its entire length having.
  • a coil body 3 which is stepped in the radial direction, receives a winding of the magnetic coil 1 and, in conjunction with the core 2, enables a compact construction of the injection valve in the area of the magnetic coil 1.
  • a tubular metal intermediate part 12 is tightly connected concentrically to a longitudinal valve axis 10, for example by welding, and thereby partially surrounds the core end 9 axially.
  • the stepped coil body 3 overlaps the core 2 and the intermediate part 12 at least partially axially.
  • a tubular valve seat carrier 16 extends downstream of the coil body 3 and the intermediate part 12 and is, for example, firmly connected to the intermediate part 12.
  • a longitudinal bore 17 runs in the valve seat support 16 and is formed concentrically with the valve longitudinal axis 10.
  • a valve needle 18 according to the invention is arranged with, for example, tubular valve needle section 19, which is designed together with a filter element 20, for example in the form of a sieve stocking.
  • a spherical valve closing body 24 is provided, on the circumference of which, for example, five flats 25 are provided for the fuel to flow past and which is connected, for example by welding, to the tubular valve needle section 19.
  • the injection valve is actuated in a known manner, for example electromagnetically.
  • the electromagnetic circuit with the magnetic coil 1, the core 2 and an armature 27 is used for the axial movement of the valve needle 18 and thus for opening against the spring force of a return spring 26 or closing the injection valve.
  • the armature 27 is at the end facing away from the valve closing body 24 of the valve needle section 19 connected by a weld seam and aligned with the core 2.
  • a cylinder-shaped valve seat body 29, which has a fixed valve seat 30, is tightly mounted by welding.
  • a guide opening 32 of the valve seat body 29 serves to guide the valve closing body 24 during the axial movement of the valve needle 18 with the armature 27 along the valve longitudinal axis 10 together.
  • the valve seat body 29 On its end face remote from the valve closing body 24, the valve seat body 29 is provided with, for example Cup-shaped spray hole disk 34 is connected concentrically and firmly, for example by an all-round tight weld seam, for example formed by a laser. At least one, for example four, spray openings 39 formed by erosion or stamping are provided in the, for example, pot-shaped spray perforated disk 34.
  • a protective cap 43 is arranged on the periphery of the valve seat carrier 16 at its downstream end facing away from the core 2 and is connected to the valve seat carrier 16, for example, by means of a catch.
  • the insertion depth of the valve seat body 29 with the spray orifice plate 34 determines the presetting of the stroke of the valve needle 18.
  • the one end position of the valve needle 18 when the solenoid coil 1 is not excited is due to the contact of the
  • Valve closing body 24 fixed to the valve seat 30 of the valve seat body 29, while the other end position of the valve needle 18 results when the solenoid coil 1 is excited due to the armature 27 resting on the core end 9.
  • the magnet coil 1 is surrounded by at least one guide element 45, for example designed as a bracket and serving as a ferromagnetic element, which at least partially surrounds the magnet coil 1 in the circumferential direction and rests with its one end on the core 2 and its other end on the valve seat support 16 and can be connected to it, for example, by welding, soldering or gluing.
  • at least one guide element 45 for example designed as a bracket and serving as a ferromagnetic element, which at least partially surrounds the magnet coil 1 in the circumferential direction and rests with its one end on the core 2 and its other end on the valve seat support 16 and can be connected to it, for example, by welding, soldering or gluing.
  • An adjusting sleeve 48 inserted into a flow bore 46 of the core 2 concentric to the longitudinal valve axis 10 serves to adjust the spring preload of the return spring 26 resting on the adjusting sleeve 48, which in turn is supported with its opposite side on the valve needle section 19.
  • the injection valve is largely enclosed with a plastic encapsulation 50, which extends from the core 2 in the axial direction via the magnet coil 1 and the at least one guide element 45 to the valve seat support 16, the at least one guide element 45 being completely covered axially and in the circumferential direction .
  • This plastic encapsulation 50 includes, for example, an injection molded electrical connector 52.
  • the injection valve can have a fuel filter 55.
  • the fuel filter 55 then protrudes into the flow bore 46 of the core 2 at its inlet side, the end 56 facing away from the spray orifice plate 34. The one entering the fuel injector
  • the fuel filter 55 ensures that particles carried in the fuel are filtered out which, because of their size or chemical composition, could cause blockages or damage in the injection valve.
  • the fuel filter 55 can be mounted, and in the assembled state it rests, for example, with a retaining ring 58 with a slight radial pressure on the wall of the flow bore 46.
  • the filter fabric of the fuel filter 55 is fastened in a cup-shaped carrier part 60 made of plastic with, for example, three axial webs 61.
  • the filter element 20 is provided on the valve needle 18 designed according to the invention.
  • the filter element 20 In the assembled state of the injection valve, the filter element 20 is integrated in or on the valve needle 18. From a manufacturing point of view, however, it makes sense to to produce element 20 separately from the individual components of valve needle 18. The pushing on, inserting or other options for attaching the filter element 20 in or on the valve needle 18 are explained in more detail below.
  • the filter element 20 arranged in or on the valve needle 18 has the function of keeping all particles and contaminants upstream of the valve seat 30 in the interior of the injection valve away from the valve seat 30 and thus preventing blockages or leaks at the valve seat 30.
  • Contamination in the interior of the injection valve can occur, for example, when inserting the adjusting sleeve 48, when the fuel filter 55 is pressed in, due to wear on the abutment surfaces of the core 2 and armature 27 or as a result of production-related burrs on various components of the injection valve.
  • the filter element 20 for example made of a conventional polyamide fabric as a screen fabric 62, is drawn in the form of a screen stocking without a plastic reinforcement over the valve needle section 19 and completely surrounds it radially over the entire axial extension length.
  • the sieve stocking is, for example, with an axially running seam 63 on the
  • FIGS. 2 to 11 show different exemplary embodiments of filter elements 20 integrated in or on valve needle 18. The representation of the entire injection valve is omitted in these figures, since this is shown in FIG. 1 Fuel injection valve is intended only as an example for possible uses of filter elements 20 and therefore other series of valves, especially injection valves, can also be equipped with the valve needles 18 according to the invention. Compared to the embodiment shown in FIG. Example of the same or equivalent parts of the valve needle 18 are also identified in FIGS. 2 to 11 by the same reference numerals.
  • Filter element 20 according to the exemplary embodiment shown in FIG. 1 is shown again in FIG. 2. Without a plastic reinforcement in the form of a carrier body, the filter element 20 is pulled over the valve needle section 19 and surrounds it completely radially. In addition to the welding (seam 63) already mentioned, slipping of the filter element 20 is also ruled out in that the armature 27, as a part firmly connected to the valve needle section 19, for example by welding, also engages around the screen fabric 62 and between it and the valve needle section 19 clamps.
  • FIGS. 3 and 4 show a second exemplary embodiment of a valve needle 18 with a filter element 20 attached to the outer circumference of the valve needle section 19.
  • the sleeve-shaped filter element 20, which is shown in section in FIG. 3, is now similar to the fuel filter 55 det, ie consisting of a carrier body 64 made, for example, of plastic and the actual screen fabric 62, for example a polyamide fabric.
  • the screen fabric 62 is also molded, for example, during the manufacture of the carrier body 64.
  • the carrier body 64 is surrounded by a circumferential ring section 67, which extends away from the valve closing body 24, and by, for example, three axial webs 65 which run in the axial direction and are offset by 120 ° on the circumference of the filter element 20 and which serve as the sieve fabric 62 minimal cover, formed.
  • the axial webs 65 thus extend from the ring section 67 to directly to the valve closing body 24.
  • FIG. 4 as a sectional illustration of a section along the line IV-IV in FIG. 3 again illustrates the arrangement of the axial webs.
  • ge 65 which have only a small width and thus only cover the fuel outlet openings in the valve needle section 19 to a small extent even in an unfavorable position.
  • the ring section 67 is designed such that it can overlap a collar 70 existing at the downstream end of the armature 27 and thus there is a latching between the carrier body 64 and the armature 27, which prevents the filter element 20 from slipping.
  • the filter element 20 is therefore completely outside of the actual valve needle 18.
  • the filter element 20 is pushed into the tubular valve needle section 19.
  • the filter element 20 has a largely similar shape to the filter element 20 shown in FIGS. 3 and 4. It therefore also consists of a carrier body 64 made of plastic and the sieve fabric 62.
  • the carrier body 64 has a bottom 72 facing the valve closing body 24, a circumferential ring section 67 facing away from the valve closing body 24 and two or three axially extending between the ring section 67 and the bottom 72 and 180 ° or 120 ° on the circumference of the filter element 20 offset axial webs 65.
  • Screen fabric 62 is, for example, also molded on during the manufacture of the carrier body 64. While the bottom 72 completely closes the inner diameter of the valve needle section 19 between the fuel outlet openings and the valve closing body 24 and can thus serve to deposit the particles and impurities, the ring section 67 represents an open cross section so that the fuel is unhindered can flow into the valve needle section 19.
  • the filter element 20 is thus cup-shaped.
  • the ring portion 67 has, for example, such an outer diameter that an interference fit in Valve needle section 19 is present, so that a very simple type of fastening is guaranteed, the force of a human finger being completely sufficient to insert the filter element 20.
  • FIG. 6, which shows a section along the line VI-VI in FIG. 5, illustrates the arrangement of the, for example, three axial webs in the interior of the valve needle section 19.
  • an actuating part consisting of the valve needle section 19 and the armature 27, which is produced in one piece by the so-called metal injection molding method (MIM), is shown in section.
  • the method already known, inter alia, from DE-PS 42 30 376 comprises the production of molded parts from a metal powder with a binder, for example a plastic binder, for example on conventional plastic injection molding machines and the subsequent removal of the binder and sintering remaining metal powder structure.
  • the valve closing body 24 is then firmly and tightly connected to the valve needle section 19, for example by means of a welded connection at the downstream end of the actuating part.
  • a valve needle 18, in which at least the actuating part consisting of valve section 19 and armature 27 is formed in one piece as a MIM part and valve needle section 19 represents a solid part, has already been proposed in German patent application DE-P 44 15 850.5.
  • FIG. 7 shows a plan view of the valve needle 18 or the armature 27 from an upstream end face 74 facing the core 2.
  • a holding shoulder 75 which is axially lower than the end face 74 and has a smaller diameter than the end face 74, for supporting the return spring 26 by, for example, three or four axial grooves running in the direction of the valve longitudinal axis 10 76 is interrupted.
  • the axial grooves 76 extend over the entire remaining length of the armature 27 and serve to allow the fuel coming from the flow bore 46 of the core 2 to flow unhindered in the direction of the valve seat 30.
  • FIG. 8 is an illustration of a section along the line VIII-VIII in FIG. 7, the section being carried out in such a way that it runs both through the solid material from the holding shoulder 30 in the axial direction of the armature 27 and through an axial groove 76 in the armature 27.
  • the valve needle section 19 projects partially into the armature 27, that is to say that an upstream end face 77 of the valve needle section 19 facing the holding shoulder 30 lies further upstream than a shoulder 78 resulting on the outer contour of the actuating part from armature 27 to valve needle section 19, at which the axial grooves 76 end.
  • the axial grooves 76 no longer represent grooves, but instead, due to the complete encapsulation of the material, axial flow channels 80 adjoining one another in alignment.
  • the fuel occurs in the area of the shoulder 78 from the flow channels 80 at least partially as a wall film of the valve needle section 19, since the inner boundary of each flow channel 80 is given by the valve needle section 19.
  • paragraph 78 the
  • the sleeve-shaped filter element 20 is fastened to the valve needle section 19, for example, in a manner similar to the embodiment shown in FIGS. 3 and 4.
  • the valve needle section 19 as a section of the actuating part produced by means of the MIM method has, for example, four latching lugs 82 on its circumference axially close to the shoulder 78, which are each offset on the valve needle section 19 by 90 °.
  • These latches 82 can now encompass a carrier body 64 made of plastic of the filter element 20, with which a secure fixation of the filter element 20 on the valve needle 18 is guaranteed.
  • Flow spaces 83 remain in the circumferential direction between the locking lugs 82 for the fuel flowing in via the flow channels 80, since the carrier body 64 with its upper ring section 85 has a larger inner diameter than the diameter of the valve needle section 19 between the locking lugs 82.
  • a lower ring section 86 also belongs to the carrier body 64, which forms the downstream end of the filter element 20.
  • the screen fabric 62 through which the fuel flows radially outward between the two ring sections 85 and 86, has also been molded on, for example, during the manufacture of the carrier body 64.
  • the two ring sections 85 and 86 can be connected to one another by axial webs or can also be separate from one another if only the screen fabric 62 is to be present between the two ring sections 85 and 86.
  • FIGS. 9 and 10 are representations of sections along lines IX-IX and XX in FIG. 8 through the upper ring section 85 of the carrier body 64 of the filter element 20.
  • the formation of the latching lugs 82 which are in each case, becomes particularly clear Extend radially outwards from the circumference of the valve needle section 19 by 90 ° and thus offer the possibility of locking the carrier body 64.
  • the inner opening of the ring section 85 of the carrier body 64 is not circular, but with different areas of larger and smaller opening width.
  • four recesses 88 are provided in the ring section 85, for example, into which the locking lugs 82 engage.
  • the flow spaces 83 formed between two locking lugs 82 have their greatest width exactly in the middle between two locking lugs 82, since the valve needle section 19 has a circular cross section and the inner opening of the ring section 85 has a largely square cross section.
  • a circle arranged centrally in a square always has the greatest distance from the corner points of the square, which are therefore exactly in the middle between two locking lugs 82.
  • the fuel comes from the axial grooves 76 via the flow channels 80 in the armature 27 directly into the flow spaces 83 and then exits the filter element 20 radially through the screen fabric 62 in the direction of the valve seat 30. Particles entrained in the fuel can be deposited in a wedge opening 89 of the lower ring section 86, which is slightly wedge-shaped toward the valve needle 18.
  • a filter element 20 in the form of a plate spring.
  • the actuating part consisting of armature 27 and valve needle section 19 is, for example, formed in one piece and has at least one flow channel 80 running in armature 27, which ends at armature 27 from armature 27 to valve needle section 19, resulting on the outer contour of the actuating part, with which the fuel can reach valve seat 30 directly.
  • the filter element 20 is therefore located between the end of the flow channel 80 at the shoulder 78 and the valve seat 30.
  • the filter element 20 therefore has only two circumferential retaining rings 90, 91, which have a very small cross-section and are made of plastic or metal, which have a different diameter and clamp the screen fabric 62 between them.
  • the sieve fabric 62 tapers downstream in the shape of a truncated cone, since the retaining ring 91 facing the valve closing body 24 has a smaller one The diameter is that of the retaining ring 90 facing away from the valve closing body 24.
  • the retaining rings 90 and 91 of the filter element 20 are accommodated in ring receiving grooves 92 provided for this purpose on the shoulder 78 of the armature 27 and on the valve needle section 19. By clipping or pressing in the retaining rings 90 in the ring receiving grooves 92 (press fit) a sufficiently secure fit is guaranteed.
  • filter elements 20 can be used on a wide variety of valve needles 18 of valves, especially of injection valves, also on valve needles which are not explained in more detail here.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Dans les soupapes d'injection de type connu, des filtres à carburant sont insérés en force et fixés dans une tubulure d'admission de carburant. Ces filtres permettent de séparer certains constituants contenus dans le carburant amené à la soupape d'injection et qui, par suite de leur taille, peuvent boucher ou endommager ladite soupape. Des impuretés se trouvant à l'intérieur de la soupape d'injection et provenant des composants insérés, de l'usure sur les surfaces de butée ou des ébarbures de fabrication, ne peuvent toutefois pas être séparées par filtration, de sorte qu'on a toujours un risque d'obstruction ou de fuite au niveau du siège de soupape. Le pointeau de soupape (18) selon l'invention, par exemple pour soupape d'injection, présente un élément filtrant (20) intégré dans/ou sur ce pointeau. Cet élément filtrant (20) a pour fonction de retenir toutes les particules et impuretés se trouvant à l'intérieur de la soupape, en amont du siège de soupape (30) et d'éviter ainsi les colmatages ou les fuites au niveau de ce siège. Le pointeau de soupape convient particulièrement pour les soupapes d'injection utilisées dans les systèmes d'injection de carburant pour moteurs à combustion interne à compression du mélange et allumage commandé.
PCT/DE1995/000742 1994-06-23 1995-06-07 Pointeau de soupape dote d'un element filtrant WO1996000348A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944421881 DE4421881A1 (de) 1994-06-23 1994-06-23 Ventilnadel
DEP4421881.8 1994-06-23

Publications (1)

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WO1996000348A1 true WO1996000348A1 (fr) 1996-01-04

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PCT/DE1995/000742 WO1996000348A1 (fr) 1994-06-23 1995-06-07 Pointeau de soupape dote d'un element filtrant

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DE (1) DE4421881A1 (fr)
WO (1) WO1996000348A1 (fr)

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US6645717B1 (en) 1999-03-11 2003-11-11 Whatman, Inc. Solid medium and process for the storage and rapid purification of nucleic acid
US6958392B2 (en) 1998-10-09 2005-10-25 Whatman, Inc. Methods for the isolation of nucleic acids and for quantitative DNA extraction and detection for leukocyte evaluation in blood products
US7638099B2 (en) 2004-04-09 2009-12-29 Vivebio, Llc Devices and methods for collection, storage and transportation of biological specimens
WO2011095370A1 (fr) * 2010-02-04 2011-08-11 Delphi Technologies Holding S.À.R.L. Aiguille pour pointeau
CN107847830A (zh) * 2015-07-16 2018-03-27 卡特彼勒公司 用于燃料喷射器的过滤器适配器
WO2019101473A1 (fr) * 2017-11-23 2019-05-31 Pierburg Gmbh Douille pour une soupape à fluide et soupape à fluide pouvant être traversée axialement

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DE19603383A1 (de) * 1996-01-31 1997-08-07 Teves Gmbh Alfred Elektromagnetventil
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WO2019101473A1 (fr) * 2017-11-23 2019-05-31 Pierburg Gmbh Douille pour une soupape à fluide et soupape à fluide pouvant être traversée axialement

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