EP1001863A1 - Method for producing a valve seat body for a fuel injection valve, and corresponding fuel injection valve - Google Patents

Method for producing a valve seat body for a fuel injection valve, and corresponding fuel injection valve

Info

Publication number
EP1001863A1
EP1001863A1 EP98959704A EP98959704A EP1001863A1 EP 1001863 A1 EP1001863 A1 EP 1001863A1 EP 98959704 A EP98959704 A EP 98959704A EP 98959704 A EP98959704 A EP 98959704A EP 1001863 A1 EP1001863 A1 EP 1001863A1
Authority
EP
European Patent Office
Prior art keywords
valve seat
valve
area
guide
opening
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
Application number
EP98959704A
Other languages
German (de)
French (fr)
Other versions
EP1001863B1 (en
Inventor
Hubert Stier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1001863A1 publication Critical patent/EP1001863A1/en
Application granted granted Critical
Publication of EP1001863B1 publication Critical patent/EP1001863B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
    • B24B15/02—Machines or devices designed for grinding seat surfaces; Accessories therefor in valve housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49306—Valve seat making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49409—Valve seat forming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49426—Valve or choke making including metal shaping and diverse operation

Definitions

  • valve seat body for a fuel injector and fuel injector
  • the invention is based on a method for producing a valve seat body with a valve seat for a fuel injector according to the preamble of claim 1 or a fuel injector according to the preamble of claim 9.
  • a fuel injector with a valve seat body which has, inter alia, a guide bore and a valve seat.
  • the guide bore serves to guide an axially movable valve needle, on which a valve closing body designed as a ball is provided. This ball interacts with the valve seat tapering in the downstream direction and forms a sealing seat valve with it.
  • guide sections and fuel channels alternate over their circumference.
  • both the guide sections and the valve seat are reworked by means of grinding after forming (massive forming, turning). The time and tools separate from the processing
  • the machining of the guide sections of the valve seat takes place by means of relatively imprecise internal cylindrical grinding. With internal cylindrical grinding, a grinding pin is inserted into the guide bore, with which the guide sections are machined while rotating.
  • the valve seat is also finely machined by grinding, with additional finishing by honing depending on the requirements. In order to achieve a high concentricity with optimal sealing behavior, several processing tools as well as successive finishing steps are necessary.
  • a fuel injector is already known from DE-OS 195 37 382, which has a valve seat body and a disk-shaped guide body located upstream thereof.
  • the guide body has an at least partially domed inner guide opening for a spherical valve member.
  • the valve seat body and the guide body are each machined separately from one another at their inner openings which are to be produced exactly. This is also done with different processing tools in different setups.
  • the method according to the invention for producing a valve seat body with a valve seat for a fuel injector with the characterizing features of claim 1 has the advantage that both guide sections and a valve seat area in a valve seat body are extremely exact in a simple manner with little material, time and tool expenditure be finished. It is particularly advantageous that only a single processing tool, namely a very precisely shaped so-called master ball, is required for the fine machining of the various areas, which is also carried out in an ideal manner at the same time.
  • the fuel injector according to the invention with the characterizing features of claim 9 has the advantage that a valve seat body with a valve seat area and a guide area can be machined particularly easily and inexpensively, and this with an extremely high quality in terms of concentricity and tightness.
  • guide sections in the guide area are narrow from the outset in the axial direction and in the circumferential direction and are therefore small-area, so that they can be machined optimally with a master ball as a machining tool.
  • FIG. 1 shows a fuel injector with a specially shaped valve seat body produced according to the invention in section
  • 2 shows the valve seat body with a so-called master ball
  • FIG. 3 shows a top view of the valve seat body with a spherical valve closing body located therein and cooperating with the valve seat
  • FIG. 4 shows a top view only of the valve seat body with the scale points of the valve closing body in the valve seat body not being shown to scale.
  • valve 1 shows, as an exemplary embodiment, an electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines.
  • the valve has a tubular valve seat support 1, in which a longitudinal bore 3 is formed concentrically with a longitudinal valve axis 2.
  • An axially movable valve needle 6 is arranged in the longitudinal bore 3.
  • the valve is actuated electromagnetically in a known manner.
  • an only partially illustrated electromagnetic circuit with a magnet coil 10, a core 11 and an armature 12 is used.
  • the valve needle 6 is held by the armature 12, a spherical valve closing body 13 and a connecting part 14 connecting these two individual parts, the
  • Connecting part 14 has a tubular shape.
  • the return spring 8 is supported with its lower end on the upper end face of the connecting part 14.
  • the anchor 12 is connected to the end of the connecting part 14 facing away from the valve closing body 13 by a weld seam 15 and is aligned with the core 11.
  • the valve closing body 13 is also firmly connected to the end of the connecting part 14 facing away from the armature 12, for example with a weld seam 16.
  • the magnet coil 10 surrounds the core 11, which represents the end of a fuel inlet connection piece which is enclosed by the magnet coil 10 and which serves to supply the medium to be metered by means of the valve, here fuel.
  • a tubular, metal intermediate part 19 is connected, for example by welding, concentrically to the longitudinal axis 2 of the valve.
  • a cylindrical valve seat body 25 is tightly mounted by welding in the longitudinal bore 3 running concentrically to the longitudinal axis 2 of the valve.
  • the valve seat body 25 shaped according to the invention has a fixed valve seat region 26 facing the core 11.
  • the magnetic coil 10 is at least partially surrounded in the circumferential direction by at least one guide element 30, which is designed, for example, as a bracket and serves as a ferromagnetic element, one end of which rests on the core 11 and the other end of which rests on the valve seat support 1 and with these, for example by welding, Soldering or an adhesive connection is connected.
  • a guide region 31 of a through opening 32 of the valve seat body 25 serves to guide the valve closing body 13 during the axial movement.
  • the valve seat region 26 likewise represents a region of the through opening 32 which, for example, directly adjoins the guide region 31 in the downstream direction.
  • valve seat body 25 On its one lower end face 33, which faces away from the valve closing body 13, the valve seat body 25 is connected concentrically and firmly to an injection cup disk 34, for example in the form of a pot.
  • the valve seat body 25 and the spray orifice plate 34 are connected, for example, by a circumferential and tight weld 45, for example formed by a laser.
  • This type of assembly increases the risk of undesired deformation of the spray orifice plate 34 in the region of at least one, for example four, by eroding or stamping molded spray openings 46 avoided.
  • the attachment of the spray orifice plate 34 to the valve seat body 25 should take place before the fine machining of the valve seat body 25 is carried out, which is described in more detail below.
  • valve seat part consisting of valve seat body 25 and spray orifice plate 34 into the longitudinal bore 3 determines, among other things. the adjustment of the stroke of the
  • Valve needle 6 since the one end position of the valve needle 6 is fixed when the solenoid 10 is not energized by the valve closing body 13 bearing against the valve seat area 26.
  • the other end position of the valve needle 6 is determined when the magnet coil 10 is excited, for example by the abutment of an upper end face 22 of the armature 12 on a lower end face 35 of the core 11. The way between these two end positions of the valve needle 6 represents the stroke.
  • the spherical valve closing body 13 interacts with the surface of the valve seat region 26 of the valve seat body 25 that tapers in the shape of a truncated cone in the direction of flow.
  • the immediate valve seat can also be formed by a slightly raised and narrow ring seat region 26 'compared to the frustoconical surface. In such a case, the ring seat region 26 ′ projects approximately 50 to 100 ⁇ m beyond the valve seat region 26.
  • the guide area 31 has several
  • valve seat body 25 is shown as an individual component together with a so-called master ball 130 which, when the manufacturing method according to the invention is used, for fine machining
  • the master ball 130 is fastened, for example, to a rod-shaped, rotating tool holder body 129, which is known in a comparable form, for example from DE-OS 196 02 068.
  • the through opening 32 in the valve seat body 25 has a plurality of differently designed sections or regions which adjoin one another axially.
  • the essential areas of the passage opening 32 are, for example, an inflow area 47 which tapers in the downstream direction, a central opening area 48 which has a larger inner diameter than the diameter of the spherical valve closing body 13 or Master ball 130, the guide area 31, the valve seat area 26 or ring seat area 26 'and an exit area 49.
  • the guide area 31 is formed by one over its Extent alternating sequence of web-like guide sections 51 and channel-like flow passages 27 characterized.
  • This previously described contour of the inner through opening 32 and the otherwise largely cylindrical outer contour are produced in a known manner by corresponding primary shaping and massive shaping (for example cold forming, cold pressing; optionally hardening).
  • the final fine machining of the valve seat area 26 and of the guide sections 51 in the guide area 31 is carried out according to the invention simultaneously with the master ball 130.
  • the very precisely producible and very hard master ball 130 with an ideal spherical shape has a slightly larger diameter than the valve closing body 13 which later interacts with the valve seat 26, 26 '.
  • the fine machining of the valve seat body 25 with the master ball 130 is honing (ball honing ) or fine grinding or lapping, using very fine-grained honing oils, lapping pastes or grinding pastes with which minimal material removal can be achieved at the desired locations in the valve seat body 25.
  • desired minimal curvatures are generated on the guide sections 51, which have a radius that corresponds to the radius of the master ball 130.
  • the guide sections 51 are very a priori in the axial direction and in the circumferential direction short and narrow, so that they can be optimally processed with the master ball 130.
  • the guide sections 51 are ideally viewed in the axial direction in the area of the ball equator 52, 52 'of the master ball 130 or the valve closing body 13 arranged there later, the guide sections 51, for example, viewed in the downstream direction minimally in front of the ball equator 52, 52' Start opening area 48 as follows.
  • the spherical equator 52 'of the valve closing body 13 is indicated in Figure 1.
  • the guide sections 51 extend in the axial direction away from the valve seat area 26, 26 'so far that they protrude only a maximum of 150 ⁇ m over the ball equator 52' of the valve closing body 13 when the valve closing body 13 is in contact with the valve seat area 26, 26 '.
  • Flow passages 27 extend between the individual guide sections 51 and have a respective radially outer passage base 54, for example with the radius of the opening area 48 as a continuation thereof.
  • FIGS. 3 and 4 illustrate as top views of the valve seat body 25, it makes sense to provide five guide sections 51 and five flow passages 27 in the guide area 31 alternately over the circumference.
  • different designs are also conceivable, with three guide sections 51 being provided in any case.
  • the plan view of the valve seat body 25 in FIG. 4 is intended above all to clarify the points of contact of the valve closing body 13, not shown here, in the region of the valve seat 26, 26 'or on the guide sections 51 in the valve seat body 25, the blackening used not indicating the scale .
  • the simultaneous finishing of the areas 26, 26 ', 51 of the valve seat body 25 performing the sealing and guiding functions takes place.
  • the immediate sealing surface in the exemplary embodiment shown in FIG. 2, the slightly raised ring seat region 26 ', and the guide sections 51 are exactly adapted to the shape of the master ball 130 or the minimally smaller valve closing body 13.
  • the curvature is transmitted with the master ball 130, so that ultimately slightly curved guide sections 51 are present at the end of the guide area 31 facing away from the valve seat area 26.
  • Machining technology advantageously achieves concentricity that cannot be achieved with known cone / ball sealing seat arrangements with comparatively little effort. This machining process ensures almost ideal roundness in the valve seat area 26 with deviations (roundness tolerances) of only 0.5 ⁇ m or less.

Abstract

Conventional valve seat bodies for fuel injection valves are precision-worked using different tools for working on the guiding sections for guiding an axially movable valve element, and the valve seat at separate times. The inventive method for producing a valve seat for a fuel injection valve comprises not only the known steps for producing a valve seat body (25), for creating a through opening (32) inside said valve seat body (25), for shaping out a valve seat area (26) in the form of a truncated cone-shaped section of the through opening (32) and for shaping out a guiding area (31), but also the simultaneous precision-working of all of the guiding sections (51) in the guiding area (31) and the valve seat area (26, 26') using a master sphere (130).

Description

Verfahren zur Herstellung eines Ventilsitzkörpers für ein Brennstoffeinspritzventil und BrennstoffeinspritzventilMethod of manufacturing a valve seat body for a fuel injector and fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zur Herstellung eines Ventilsitzkörpers mit einem Ventilsitz für ein Brennstoffeinspritzventil nach der Gattung des Anspruchs 1 bzw. von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 9.The invention is based on a method for producing a valve seat body with a valve seat for a fuel injector according to the preamble of claim 1 or a fuel injector according to the preamble of claim 9.
Aus der DE-OS 40 37 952 ist bereits ein Brennstoffeinspritzventil mit einem Ventilsitzkörper bekannt, der u.a. eine Führungsbohrung und einen Ventilsitz aufweist. Die Führungsbohrung dient der Führung einer axial beweglichen Ventilnadel, an der ein als Kugel ausgebildeter Ventilschließkörper vorgesehen ist. Diese Kugel wirkt mit dem sich in stromabwärtiger Richtung kegelstumpfförmig verjüngenden Ventilsitz zusammen und bildet mit diesem ein Dichtsitzventil. In der stromaufwärts des Ventilsitzes liegenden Führungsbohrung wechseln sich über ihren Umfang Führungsabschnitte und Brennstoffkanäle ab. Bei einem solchen bekannten Ventilsitzkörper werden sowohl die Führungsabschnitte als auch der Ventilsitz mittels Schleifen nach dem Umformen (Massivumformen, Drehen) nachbearbeitet. Die zeitlich und werkzeugmäßig getrennt von der Bearbeitung des Ventilsitzes ablaufende Bearbeitung der Führungsabschnitte erfolgt dabei mittels relativ ungenauen Innenrundschleifen. Bei dem Innenrundschleifen wird ein Schleifstift in die Führungsbohrung eingebracht, mit dem unter Rotation die Führungsabschnitte bearbeitet werden.From DE-OS 40 37 952 a fuel injector with a valve seat body is already known, which has, inter alia, a guide bore and a valve seat. The guide bore serves to guide an axially movable valve needle, on which a valve closing body designed as a ball is provided. This ball interacts with the valve seat tapering in the downstream direction and forms a sealing seat valve with it. In the guide bore located upstream of the valve seat, guide sections and fuel channels alternate over their circumference. In such a known valve seat body, both the guide sections and the valve seat are reworked by means of grinding after forming (massive forming, turning). The time and tools separate from the processing The machining of the guide sections of the valve seat takes place by means of relatively imprecise internal cylindrical grinding. With internal cylindrical grinding, a grinding pin is inserted into the guide bore, with which the guide sections are machined while rotating.
Auch der Ventilsitz wird mittels Schleifen feinbearbeitet, wobei je nach den Anforderungen noch eine zusätzliche Nachbearbeitung durch Honen erfolgen muß. Um eine hohe Rundlaufgenauigkeit bei optimalem Dichtverhalten zu erreichen, sind mehrere Bearbeitungswerkzeuge sowie zeitlich aufeinanderfolgende Feinbearbeitungsschritte nötig.The valve seat is also finely machined by grinding, with additional finishing by honing depending on the requirements. In order to achieve a high concentricity with optimal sealing behavior, several processing tools as well as successive finishing steps are necessary.
Bekannt ist z.B. aus der DE-OS 196 02 068 ein Verfahren zur Herstellung von rotationssymmetrischen Ventilsitzflächen mit hoher Oberflächengüte an Ventilen, bei dem eine oben beschriebene Nachbearbeitung des Ventilsitzes mittels eines kugelförmigen Werkzeugkörpers vorgenommen wird. Dabei ist der kugelförmige Werkzeugkörper mit einem Durchmesser ausgebildet, der kleiner als der Querschnitt der Führungsöffnung im zu bearbeitenden Ventilsitzkörper ist, so daß nur die unmittelbare Ventilsitzfläche feinbearbeitet wird. Die Öffnungsweite der Führungsöffnung muß zwangsläufig größer sein als der Durchmesser des kugelförmigen Werkzeugs, da ansonsten das Werkzeug überhaupt nicht durch die axial recht lange Führungsöffnung bis zur Ventilsitzfläche in den Ventilsi zkörper eintauchen könnte. In einer solchen zylindrischen Führungsöffnung liegt außerdem für die Feinbearbeitung ein so großes Zerspanungsvolumen vor, daß ein kugelförmiger Werkzeugkörper für den Führungsbereich nicht einsetzbar ist.It is known e.g. from DE-OS 196 02 068 a process for the production of rotationally symmetrical valve seat surfaces with high surface quality on valves, in which the above-described reworking of the valve seat is carried out by means of a spherical tool body. The spherical tool body is designed with a diameter which is smaller than the cross section of the guide opening in the valve seat body to be machined, so that only the immediate valve seat surface is machined. The opening width of the guide opening must inevitably be larger than the diameter of the spherical tool, since otherwise the tool could not dip into the valve body through the axially quite long guide opening up to the valve seat in the valve body. In such a cylindrical guide opening there is also such a large machining volume for fine machining that a spherical tool body cannot be used for the guide area.
Des weiteren ist bereits aus der DE-OS 195 37 382 ein Brennstoffeinspritzventil bekannt, das einen Ventilsitzkörper sowie einen davon stromaufwärts liegenden scheibenförmigen Führungskörper aufweist. Der Führungskörper besitzt dabei eine wenigstens teilweise kalottenförmig gewölbte innere Führungsöffnung für ein kugelförmiges Ventilglied. Der Ventilsitzkörper und der Führungskörper werden jeweils getrennt voneinander an ihren exakt herzustellenden inneren Öffnungen feinbearbeitet. Dies erfolgt ebenfalls mit verschiedenen Bearbeitungswerkzeugen in unterschiedlichen Aufspannungen.Furthermore, a fuel injector is already known from DE-OS 195 37 382, which has a valve seat body and a disk-shaped guide body located upstream thereof. The guide body has an at least partially domed inner guide opening for a spherical valve member. The valve seat body and the guide body are each machined separately from one another at their inner openings which are to be produced exactly. This is also done with different processing tools in different setups.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Verfahren zur Herstellung eines Ventilsitzkörpers mit einem Ventilsitz für ein Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß in einfacher Art und Weise mit geringem Material-, Zeit- und Werkzeugaufwand äußerst exakt sowohl Führungsabschnitte als auch ein Ventilsitzbereich in einem Ventilsitzkörper feinbearbeitet werden. Von besonderem Vorteil ist dabei, daß nur ein einziges Bearbeitungswerkzeug, nämlich eine sehr genau ausgeformte sogenannte Masterkugel, für die Feinbearbeitung der verschiedenen Bereiche benötigt wird, die zudem in idealer Weise zeitgleich erfolgt.The method according to the invention for producing a valve seat body with a valve seat for a fuel injector with the characterizing features of claim 1 has the advantage that both guide sections and a valve seat area in a valve seat body are extremely exact in a simple manner with little material, time and tool expenditure be finished. It is particularly advantageous that only a single processing tool, namely a very precisely shaped so-called master ball, is required for the fine machining of the various areas, which is also carried out in an ideal manner at the same time.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Herstellverfahrens möglich.Advantageous further developments and improvements of the manufacturing method specified in claim 1 are possible through the measures listed in the subclaims.
Besonders vorteilhaft ist es, zur Feinbearbeitung der Führungsabschnitte und des Ventilsitzes ein Kugelhonen bzw. Kugelfeinschleifen oder Kugelläppen anzuwenden. Mit diesenIt is particularly advantageous to use ball honing or ball fine grinding or ball lapping for fine machining of the guide sections and the valve seat. With these
Verfahren sind minimale Materialabträge an den gewünschten Stellen im Ventilsitzkörper erzielbar, so daß verglichen mit bekannten Schleifverfahren nur sehr geringe Zerspanungsvolumina vorliegen, die sich durch die flächenmäßig sehr kleinen Führungsabschnitte ergeben.Processes minimal material removal can be achieved at the desired locations in the valve seat body, so that only very small compared to known grinding processes Machining volumes are present, which result from the very small guide sections in terms of area.
Mit dieser Bearbeitungstechnologie werden gewünschte minimale Wölbungen an den Führungsabschnitten erzeugt, die einen Radius aufweisen, der dem Radius der Masterkugel entspricht. In vorteilhafter Weise sind dieWith this processing technology, desired minimal curvatures are generated on the guide sections, which have a radius that corresponds to the radius of the master ball. Advantageously, the
Führungsabschnitte von vornherein in axialer Richtung und in Umfangsrichtung schmal und damit kleinflächig ausgeführt, so daß diese optimal exakt mit der Masterkugel bearbeitet werden können. So werden in vorteilhafter Weise Rundlaufgenauigkeiten erreicht, wie sie bei bekannten Kegel/Kugel -Dichtsitzanordnungen mit vergleichbar geringem Aufwand nicht erzielbar sind.Guide sections from the outset in the axial direction and in the circumferential direction narrow and thus small area, so that they can be optimally machined with the master ball. In this way, concentricity is achieved in an advantageous manner, which cannot be achieved with known cone / ball sealing seat arrangements with comparatively little effort.
Das erfindungsgemäße Brennstoffeinspritzventil mir den kennzeichnenden Merkmalen des Anspruchs 9 hat den Vorteil, daß ein Ventilsitzkörper mit einem Ventilsitzbereich und einem Führungsbereich besonders einfach und kostengünstig feinbearbeitet werden kann, und dies mit einer extrem hohen Qualität bezüglich Rundlaufgenauigkeit und Dichtheit. In vorteilhafter Weise sind dazu Führungsabschnitte im Führungsbereich von vornherein in axialer Richtung und in Umfangsrichtung schmal und damit kleinflächig ausgeführt, so daß diese optimal exakt mit einer Masterkugel als Bearbeitungswerkzeug bearbeitet werden können.The fuel injector according to the invention with the characterizing features of claim 9 has the advantage that a valve seat body with a valve seat area and a guide area can be machined particularly easily and inexpensively, and this with an extremely high quality in terms of concentricity and tightness. Advantageously, guide sections in the guide area are narrow from the outset in the axial direction and in the circumferential direction and are therefore small-area, so that they can be machined optimally with a master ball as a machining tool.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Brennstoffeinspritzventil mit einem speziell ausgeformten, erfindungsgemäß hergestellten Ventilsitzkörper im Schnitt, Figur 2 den Ventilsitzkörper mit einer sogenannten Masterkugel, Figur 3 eine Draufsicht auf den Ventilsitzkörper mit einem darin befindlichen und mit dem Ventilsitz zusammenwirkenden kugelförmigen Ventilschließkörper und Figur 4 eine Draufsicht nur auf den Ventilsitzkörper mit nicht maßstäblicher Kenntlichmachung der Berührungsstellen des Ventilschließkörpers im Ventilsitzkörper.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a fuel injector with a specially shaped valve seat body produced according to the invention in section, 2 shows the valve seat body with a so-called master ball, FIG. 3 shows a top view of the valve seat body with a spherical valve closing body located therein and cooperating with the valve seat, and FIG. 4 shows a top view only of the valve seat body with the scale points of the valve closing body in the valve seat body not being shown to scale.
Beschreibung der AusführungsbeispieleDescription of the embodiments
In der Figur 1 ist als ein Ausführungsbeispiel ein elektromagnetisch betätigbares Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Das Ventil hat einen rohrförmigen Ventilsitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsbohrung 3 ausgebildet ist. In der Längsbohrung 3 ist eine axial bewegliche Ventilnadel 6 angeordnet.1 shows, as an exemplary embodiment, an electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines. The valve has a tubular valve seat support 1, in which a longitudinal bore 3 is formed concentrically with a longitudinal valve axis 2. An axially movable valve needle 6 is arranged in the longitudinal bore 3.
Die elektromagnetische Betätigung des Ventils erfolgt in bekannter Weise. Zur axialen Bewegung der Ventilnadel 6 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 8 bzw. Schließen des Ventils dient ein nur teilweise dargestellter elektromagnetischer Kreis mit einer Magnetspule 10, einem Kern 11 und einem Anker 12. Die Ventilnadel 6 wird von dem Anker 12, einem kugelförmigen Ventilschließkörper 13 und einem diese beiden Einzelteile verbindenden Verbindungsteil 14 gebildet, wobei dasThe valve is actuated electromagnetically in a known manner. For the axial movement of the valve needle 6 and thus for opening against the spring force of a return spring 8 or closing the valve, an only partially illustrated electromagnetic circuit with a magnet coil 10, a core 11 and an armature 12 is used. The valve needle 6 is held by the armature 12, a spherical valve closing body 13 and a connecting part 14 connecting these two individual parts, the
Verbindungsteil 14 eine rohrförmige Gestalt aufweist. Die Rückstellfeder 8 stützt sich mit ihrem unteren Ende an der oberen Stirnfläche des Verbindungsteils 14 ab. Der Anker 12 ist mit dem dem Ventilschließkörper 13 abgewandten Ende des Verbindungsteils 14 durch eine Schweißnaht 15 verbunden und auf den Kern 11 ausgerichtet. Andererseits ist auch der Ventilschließkörper 13 mit dem dem Anker 12 abgewandten Ende des Verbindungsteils 14 z.B. mit einer Schweißnaht 16 fest verbunden. Die Magnetspule 10 umgibt den Kern 11, der das sich durch die Magnetspule 10 umschließende Ende eines nicht näher gekennzeichneten Brennstoffeinlaßstutzens, der der Zufuhr des mittels des Ventils zuzumessenden Mediums, hier Brennstoff, dient, darstellt.Connecting part 14 has a tubular shape. The return spring 8 is supported with its lower end on the upper end face of the connecting part 14. The anchor 12 is connected to the end of the connecting part 14 facing away from the valve closing body 13 by a weld seam 15 and is aligned with the core 11. On the other hand, the valve closing body 13 is also firmly connected to the end of the connecting part 14 facing away from the armature 12, for example with a weld seam 16. The magnet coil 10 surrounds the core 11, which represents the end of a fuel inlet connection piece which is enclosed by the magnet coil 10 and which serves to supply the medium to be metered by means of the valve, here fuel.
Mit dem unteren Ende des Kerns 11 sowie mit dem Ventilsitzträger 1 ist konzentrisch zur Ventillängsachse 2 dicht ein rohrförmiges , metallenes Zwischenteil 19 beispielsweise durch Schweißen verbunden. In das stromabwärts liegende, dem Kern 11 abgewandte Ende des Ventilsitzträgers 1 ist in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsbohrung 3 ein zylinderförmiger Ventilsitzkörper 25 durch Schweißen dicht montiert. Der erfindungsgemäß ausgeformte Ventilsitzkörper 25 weist dem Kern 11 zugewandt einen festen Ventilsitzbereich 26 auf.With the lower end of the core 11 and with the valve seat support 1, a tubular, metal intermediate part 19 is connected, for example by welding, concentrically to the longitudinal axis 2 of the valve. In the downstream end of the valve seat carrier 1 facing away from the core 11, a cylindrical valve seat body 25 is tightly mounted by welding in the longitudinal bore 3 running concentrically to the longitudinal axis 2 of the valve. The valve seat body 25 shaped according to the invention has a fixed valve seat region 26 facing the core 11.
Die Magnetspule 10 ist von wenigstens einem beispielsweise als Bügel ausgebildeten, als ferromagnetisches Element dienenden Leitelement 30 in Umfangsrichtung wenigstens teilweise umgeben, das mit seinem einen Ende an dem Kern 11 und mit seinem anderen Ende an dem Ventilsitzträger 1 anliegt und mit diesen z.B. durch Schweißen, Löten oder eine Klebeverbindung verbunden ist. Zur Führung des Ventilschließkörpers 13 während der Axialbewegung dient ein Führungsbereich 31 einer Durchgangsöffnung 32 des Ventilsitzkörpers 25. Der Ventilsitzbereich 26 stellt ebenfalls einen Bereich der Durchgangsδffnung 32 dar, der sich beispielsweise in stromabwärtiger Richtung unmittelbar an den Führungsbereich 31 anschließt. An seiner einen, dem Ventilschließkörper 13 abgewandten unteren Stirnseite 33 ist der Ventilsitzkörper 25 mit einer z.B. topfförmig ausgebildeten Spritzlochscheibe 34 konzentrisch und fest verbunden. Die Verbindung von Ventilsitzkörper 25 und Spritzlochscheibe 34 erfolgt beispielsweise durch eine umlaufende und dichte, z.B. mittels eines Lasers ausgebildete Schweißnaht 45. Durch diese Art der Montage ist die Gefahr einer unerwünschten Verformung der Spritzlochscheibe 34 im Bereich seiner wenigstens einen, beispielsweise vier durch Erodieren oder Stanzen ausgeformten Abspritzöffnungen 46 vermieden. In vorteilhafter Weise sollte die Befestigung der Spritzlochscheibe 34 am Ventilsitzkörper 25 erfolgen bevor die Feinbearbeitung des Ventilsitzkörpers 25 vorgenommen wird, die im folgenden noch näher beschrieben ist.The magnetic coil 10 is at least partially surrounded in the circumferential direction by at least one guide element 30, which is designed, for example, as a bracket and serves as a ferromagnetic element, one end of which rests on the core 11 and the other end of which rests on the valve seat support 1 and with these, for example by welding, Soldering or an adhesive connection is connected. A guide region 31 of a through opening 32 of the valve seat body 25 serves to guide the valve closing body 13 during the axial movement. The valve seat region 26 likewise represents a region of the through opening 32 which, for example, directly adjoins the guide region 31 in the downstream direction. On its one lower end face 33, which faces away from the valve closing body 13, the valve seat body 25 is connected concentrically and firmly to an injection cup disk 34, for example in the form of a pot. The valve seat body 25 and the spray orifice plate 34 are connected, for example, by a circumferential and tight weld 45, for example formed by a laser. This type of assembly increases the risk of undesired deformation of the spray orifice plate 34 in the region of at least one, for example four, by eroding or stamping molded spray openings 46 avoided. Advantageously, the attachment of the spray orifice plate 34 to the valve seat body 25 should take place before the fine machining of the valve seat body 25 is carried out, which is described in more detail below.
Die Einschubtiefe des aus Ventilsitzkörper 25 und Spritzlochscheibe 34 bestehenden Ventilsitzteils in die Längsbohrung 3 bestimmt u.a. die Einstellung des Hubs derThe insertion depth of the valve seat part consisting of valve seat body 25 and spray orifice plate 34 into the longitudinal bore 3 determines, among other things. the adjustment of the stroke of the
Ventilnadel 6, da die eine Endstellung der Ventilnadel 6 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 13 am Ventilsitzbereich 26 festgelegt ist. Die andere Endstellung der Ventilnadel 6 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage einer oberen Stirnseite 22 des Ankers 12 an einer unteren Stirnseite 35 des Kerns 11 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 6 stellt den Hub dar.Valve needle 6, since the one end position of the valve needle 6 is fixed when the solenoid 10 is not energized by the valve closing body 13 bearing against the valve seat area 26. The other end position of the valve needle 6 is determined when the magnet coil 10 is excited, for example by the abutment of an upper end face 22 of the armature 12 on a lower end face 35 of the core 11. The way between these two end positions of the valve needle 6 represents the stroke.
Der kugelförmige Ventilschließkörper 13 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Fläche des Ventilsitzbereiches 26 des Ventilsitzkörpers 25 zusammen. Der unmittelbare Ventilsitz kann auch durch einen gegenüber der kegelstumpfförmig ausgebildeten Fläche geringfügig erhabenen und schmalen Ringsitzbereich 26' gebildet werden. Der Ringsitzbereich 26' ragt in einem solchen Falle ca. 50 bis lOOμm über den Ventilsitzbereich 26 hinaus. Der Führungsbereich 31 weist mehrereThe spherical valve closing body 13 interacts with the surface of the valve seat region 26 of the valve seat body 25 that tapers in the shape of a truncated cone in the direction of flow. The immediate valve seat can also be formed by a slightly raised and narrow ring seat region 26 'compared to the frustoconical surface. In such a case, the ring seat region 26 ′ projects approximately 50 to 100 μm beyond the valve seat region 26. The guide area 31 has several
Strömungsdurchlässe 27 auf, die eine Strömung des Mediums in Richtung zum Ventilsitz 26, 26' des Ventilsitzkörpers 25 ermöglichen.Flow passages 27, which allow a flow of the medium in the direction of the valve seat 26, 26 'of the valve seat body 25.
In der Figur 2 ist der Ventilsitzkörper 25 als Einzelbauteil zusammen mit einer sogenannten Masterkugel 130 dargestellt, die bei der Anwendung des erfindungsgemäßen Herstellverfahrens zur Feinbearbeitung alsIn FIG. 2, the valve seat body 25 is shown as an individual component together with a so-called master ball 130 which, when the manufacturing method according to the invention is used, for fine machining
Bearbeitungswerkzeug zum Einsatz kommt. Die Masterkugel 130 ist dabei beispielsweise an einem stangenförmigen, rotierenden Werkzeugaufnahmekörper 129 befestigt, der in vergleichbarer Form z.B. aus der DE-OS 196 02 068 bekannt ist. Die Durchgangsöffnung 32 im Ventilsitzkörper 25 weist mehrere verschiedenartig ausgebildete Abschnitte oder Bereiche auf, die sich axial aneinander anschließen. Die wesentlichen Bereiche der Durchgangsöffnung 32 sind dabei ein sich z.B. in stromabwärtiger Richtung verjüngender Einströmbereich 47, ein mittlerer Öffnungsbereich 48, der einen größeren Innendurchmesser besitzt als der Durchmesser des kugelförmigen Ventilschließkörpers 13 bzw. der Masterkugel 130, der Führungsbereich 31, der Ventilsitzbereich 26 bzw. Ringsitzbereich 26' sowie ein Austrittsbereich 49. Während die Bereiche 47, 48, 26 bzw. 26' und 49 über ihren Umfang gleichförmig umlaufend ausgebildet sind, ist der Führungsbereich 31 durch eine über seinen Umfang alternierende Abfolge von stegartigen Führungsabschnitten 51 und kanalartigen Strömungsdurchlässen 27 gekennzeichnet. Diese zuvor beschriebene Kontur der inneren Durchgangsöffnung 32 sowie die ansonsten weitgehend zylinderförmige Außenkontur werden in bekannter Weise durch entsprechendes Urformen und Massivumformen (z.B. Kaltverformung, Kaltpressen; optional Härten) erzeugt.Machining tool is used. The master ball 130 is fastened, for example, to a rod-shaped, rotating tool holder body 129, which is known in a comparable form, for example from DE-OS 196 02 068. The through opening 32 in the valve seat body 25 has a plurality of differently designed sections or regions which adjoin one another axially. The essential areas of the passage opening 32 are, for example, an inflow area 47 which tapers in the downstream direction, a central opening area 48 which has a larger inner diameter than the diameter of the spherical valve closing body 13 or Master ball 130, the guide area 31, the valve seat area 26 or ring seat area 26 'and an exit area 49. While the areas 47, 48, 26 or 26' and 49 are formed to be uniformly circumferential over their circumference, the guide area 31 is formed by one over its Extent alternating sequence of web-like guide sections 51 and channel-like flow passages 27 characterized. This previously described contour of the inner through opening 32 and the otherwise largely cylindrical outer contour are produced in a known manner by corresponding primary shaping and massive shaping (for example cold forming, cold pressing; optionally hardening).
Die abschließende Feinbearbeitung des Ventilsitzbereiches 26 sowie der Führungsabschnitte 51 im Führungsbereich 31 wird erfindungsgemäß mit der Masterkugel 130 gleichzeitig vorgenommen. Die sehr exakt fertigbare und sehr harte Masterkugel 130 mit einer idealen Kugelform hat dabei einen geringfügig größeren Durchmesser als der später mit dem Ventilsitz 26, 26' zusammenwirkende Ventilschließkörper 13. Bei der Feinbearbeitung des Ventilsitzkörpers 25 mit der Masterkugel 130 handelt es sich um Honen (Kugelhonen) bzw. Feinschleifen oder Läppen, wobei feinstkörnige Honöle, Läppasten oder Schleifpasten zum Einsatz kommen, mit denen minimale Materialabträge an den gewünschten Stellen im Ventilsitzkörper 25 erzielbar sind. Mit dieser Bearbeitungstechnologie werden gewünschte minimale Wölbungen an den Führungsabschnitten 51 erzeugt, die einen Radius aufweisen, der dem Radius der Masterkugel 130 entspricht. In vorteilhafter Weise sind die Führungsabschnitte 51 von vornherein in axialer Richtung und in Umfangsrichtung sehr kurz und schmal ausgeführt, so daß diese optimal exakt mit der Masterkugel 130 bearbeitet werden können.The final fine machining of the valve seat area 26 and of the guide sections 51 in the guide area 31 is carried out according to the invention simultaneously with the master ball 130. The very precisely producible and very hard master ball 130 with an ideal spherical shape has a slightly larger diameter than the valve closing body 13 which later interacts with the valve seat 26, 26 '. The fine machining of the valve seat body 25 with the master ball 130 is honing (ball honing ) or fine grinding or lapping, using very fine-grained honing oils, lapping pastes or grinding pastes with which minimal material removal can be achieved at the desired locations in the valve seat body 25. With this processing technology, desired minimal curvatures are generated on the guide sections 51, which have a radius that corresponds to the radius of the master ball 130. Advantageously, the guide sections 51 are very a priori in the axial direction and in the circumferential direction short and narrow, so that they can be optimally processed with the master ball 130.
Die Führungsabschnitte 51 liegen dabei in idealer Weise in axialer Richtung betrachtet im Bereich des Kugeläquators 52, 52' der Masterkugel 130 bzw. des später dort angeordneten Ventilschließkörpers 13, wobei die Führungsabschnitte 51 beispielsweise in stromabwärtiger Richtung gesehen minimal vor dem Kugeläquator 52, 52' dem Öffnungsbereich 48 folgend beginnen. Der Kugeläquator 52' des Ventilschließkörpers 13 ist in Figur 1 angegeben. Die Führungsabschnitte 51 erstrecken sich in axialer Richtung dem Ventilsitzbereich 26, 26' abgewandt so weit, daß sie nur maximal 150μm über den Kugeläquator 52' des Ventilschließkörpers 13 bei an dem Ventilsitzbereich 26, 26' anliegendem Ventilschließkörper 13 ragen. Zwischen den einzelnen Führungsabschnitten 51 erstrecken sich Strömungsdurchlässe 27, die einen jeweiligen radial äußeren Durchlaßgrund 54 z.B. mit dem Radius des Öffnungsbereichs 48 als Fortsetzung dessen haben. Wie die Figuren 3 und 4 als Draufsichten auf den Ventilsitzkörper 25 verdeutlichen, ist es sinnvoll, fünf Führungsabschnitte 51 und fünf Strömungsdurchlässe 27 im Führungsbereich 31 abwechselnd über den Umfang vorzusehen. Jedoch sind auch anderszahlige Ausführungen denkbar, wobei drei Führungsabschnitte 51 auf jeden Fall vorhanden sein sollen. Die Draufsicht auf den Ventilsitzkörper 25 in der Figur 4 soll vor allen Dingen die Berührungsstellen des hier nicht gezeigten Ventilschließkörpers 13 im Bereich des Ventilsitzes 26, 26' bzw. an den Führungsabschnitten 51 im Ventilsitzkörper 25 verdeutlichen, wobei mit den verwendeten Schwärzungen keine maßstäbliche Kenntlichmachung vorliegt. Mit Hilfe der sehr exakt geformten Masterkugel 130 erfolgt also die gleichzeitige Feinbearbeitung der Dicht- und Führungsfunktionen ausübenden Bereiche 26, 26', 51 des Ventilsitzkörpers 25. Bei der Anwendung des Kugelhonens bzw. des Feinschleifens oder des Läppens mit der Masterkugel 130 werden die unmittelbare Dichtfläche, im in Figur 2 dargestellten Ausführungsbeispiel also der geringfügig erhabene Ringsitzbereich 26', sowie die Führungsabschnitte 51 exakt der Form der Masterkugel 130 bzw. des minimal kleineren Ventilschließkörpers 13 angepaßt. In die axial sehr kurzen Führungsabschnitte 51 wird dabei mit der Masterkugel 130 deren Wölbung übertragen, so daß letztlich geringfügig gewölbte Führungsabschnitte 51 am dem Ventilsitzbereich 26 abgewandten Ende des Führungsbereichs 31 vorliegen. Mit der oben beschriebenenThe guide sections 51 are ideally viewed in the axial direction in the area of the ball equator 52, 52 'of the master ball 130 or the valve closing body 13 arranged there later, the guide sections 51, for example, viewed in the downstream direction minimally in front of the ball equator 52, 52' Start opening area 48 as follows. The spherical equator 52 'of the valve closing body 13 is indicated in Figure 1. The guide sections 51 extend in the axial direction away from the valve seat area 26, 26 'so far that they protrude only a maximum of 150 μm over the ball equator 52' of the valve closing body 13 when the valve closing body 13 is in contact with the valve seat area 26, 26 '. Flow passages 27 extend between the individual guide sections 51 and have a respective radially outer passage base 54, for example with the radius of the opening area 48 as a continuation thereof. As FIGS. 3 and 4 illustrate as top views of the valve seat body 25, it makes sense to provide five guide sections 51 and five flow passages 27 in the guide area 31 alternately over the circumference. However, different designs are also conceivable, with three guide sections 51 being provided in any case. The plan view of the valve seat body 25 in FIG. 4 is intended above all to clarify the points of contact of the valve closing body 13, not shown here, in the region of the valve seat 26, 26 'or on the guide sections 51 in the valve seat body 25, the blackening used not indicating the scale . With the help of the very precisely shaped master ball 130, the simultaneous finishing of the areas 26, 26 ', 51 of the valve seat body 25 performing the sealing and guiding functions takes place. When ball honing or fine grinding or lapping with the master ball 130 is used, the immediate sealing surface , in the exemplary embodiment shown in FIG. 2, the slightly raised ring seat region 26 ', and the guide sections 51 are exactly adapted to the shape of the master ball 130 or the minimally smaller valve closing body 13. In the axially very short guide sections 51, the curvature is transmitted with the master ball 130, so that ultimately slightly curved guide sections 51 are present at the end of the guide area 31 facing away from the valve seat area 26. With the one described above
Bearbeitungstechnologie werden in vorteilhafter Weise Rundlaufgenauigkeiten erreicht, wie sie bei bekannten Kegel/Kugel-Dichtsitzanordnungen mit vergleichbar geringem Aufwand nicht erzielbar sind. Dieses Bearbeitungsverfahren gewährleistet fast ideale Rundheiten im Ventilsitzbereich 26 mit Abweichungen (Rundheitstoleranzen) von nur 0,5μm oder weniger . Machining technology advantageously achieves concentricity that cannot be achieved with known cone / ball sealing seat arrangements with comparatively little effort. This machining process ensures almost ideal roundness in the valve seat area 26 with deviations (roundness tolerances) of only 0.5 μm or less.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Ventilsitzkörpers mit einem Ventilsitz für ein Brennstoffeinspritzventil mit den Verfahrensschritten1. A method for producing a valve seat body with a valve seat for a fuel injector with the method steps
- Herstellen eines eine zylinderförmige Außenkontur aufweisenden Ventilsitzkörpers (25) ,Producing a valve seat body (25) having a cylindrical outer contour,
- Einbringen einer Durchgangsöffnung (32) im Inneren des Ventilsitzkörpers (25) wenigstens mit einem Einström- oder Öffnungsbereich (47, 48), einem Führungsbereich (31) und einem Ventilsitzbereich (26, 26'),Introducing a through opening (32) inside the valve seat body (25) with at least one inflow or opening area (47, 48), a guide area (31) and a valve seat area (26, 26 '),
- Ausformen des Ventilsitzbereichs (26) als kegelstumpfförmigen Abschnitt der Durchgangsöffnung (32) ,Shaping the valve seat area (26) as a frustoconical section of the through opening (32),
- Ausformen des Führungsbereichs (31) mit über dessen Umfang abwechselnd angeordneten stegartigen Führungsabschnitten- Forming the guide area (31) with web-like guide sections arranged alternately over its circumference
(51) und kanalartigen Strömungsdurchlässen (27),(51) and channel-like flow passages (27),
- gleichzeitige Feinbearbeitung aller Führungsabschnitte (51) und des Ventilsitzbereichs (26, 26') mittels einer ein- Simultaneous finishing of all guide sections (51) and the valve seat area (26, 26 ') by means of one
Bearbeitungswerkzeug darstellenden Masterkugel (130) .Machining tool representing master ball (130).
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Feinbearbeitung mit Hilfe der Masterkugel (130) mittels Kugelhonen erfolgt . 2. The method according to claim 1, characterized in that the fine machining with the aid of the master ball (130) is carried out by means of ball honing.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Feinbearbeitung mit Hilfe der Masterkugel (130) mittels Feinschleifen erfolgt.3. The method according to claim 1, characterized in that the fine machining using the master ball (130) is carried out by means of fine grinding.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Feinbearbeitung mit Hilfe der Masterkugel (130) mittels Läppen erfolgt .4. The method according to claim 1, characterized in that the finishing with the help of the master ball (130) is carried out by lapping.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Masterkugel (130) einen Durchmesser hat, der geringfügig größer ist als der Durchmesser eines später mit dem Ventilsitzbereich (26, 26') zusammenwirkenden kugelförmigen Ventilschließkörpers (13) .5. The method according to any one of the preceding claims, characterized in that the master ball (130) has a diameter which is slightly larger than the diameter of a later with the valve seat region (26, 26 ') interacting spherical valve closing body (13).
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an dem kegelstumpfförmigen Ventilsitzbereich (26) ein erhabener Ringsitzbereich (26') angeformt wird.6. The method according to any one of the preceding claims, characterized in that a raised ring seat region (26 ') is formed on the frustoconical valve seat region (26).
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß der Ringsitzbereich (26') zwischen 50 und lOOμm erhaben gegenüber dem Ventilsitzbereich (26) ausgebildet ist.7. The method according to claim 6, characterized in that the ring seat region (26 ') between 50 and lOOμm raised compared to the valve seat region (26).
8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in die Führungsabschnitte (51) mit der Masterkugel (130) deren Wölbung übertragen wird, so daß letztlich geringfügig gewölbte Führungsabschnitte (51) am dem Ventilsitzbereich (26) abgewandten Ende des Führungsbereichs (31) vorliegen.8. The method according to any one of the preceding claims, characterized in that in the guide sections (51) with the master ball (130) whose curvature is transmitted, so that ultimately slightly curved guide sections (51) on the valve seat area (26) facing away from the end of the guide area ( 31) are available.
9. Brennstoffeinspritzventil mit einer Ventillängsachse (2), mit einem Aktor (10, 11, 12), mit dem eine Ventilnadel (6) axial bewegbar ist, wobei die Ventilnadel (6) wenigstens einen kugelförmigen Ventilschließkörper (13) umfaßt, und mit einem Ventilsitzkörper (25) , der eine Durchgangsöffnung (32) im Inneren besitzt, wobei die Durchgangsöffnung (32) in stromabwärtiger Richtung wenigstens einen Einström- oder Öffnungsbereich (47, 48), einen Führungsbereich (31) und einen Ventilsitzbereich (26, 26') aufweist, und der Ventilschließkörper (13) mit dem Ventilsitzbereich (26, 26') zusammenwirkt, dadurch gekennzeichnet, daß der Führungsbereich (31) mehrere in Umfangsrichtung durch Strömungsdurchlässe (27) unterbrochene Führungsabschnitte (51) besitzt, die sich in axialer Richtung dem Ventilsitzbereich (26, 26') abgewandt so weit erstrecken, daß sie nur maximal 150μm über den Kugeläquator (52') des Ventilschließkörpers (13) bei an dem Ventilsitzbereich (26, 26') anliegendem Ventilschließkörper (13) ragen.9. Fuel injection valve with a valve longitudinal axis (2), with an actuator (10, 11, 12) with which a valve needle (6) is axially movable, the valve needle (6) comprising at least one spherical valve closing body (13), and with a Valve seat body (25), which has a through opening (32) has in the interior, the through opening (32) having at least one inflow or opening area (47, 48), a guide area (31) and a valve seat area (26, 26 ') in the downstream direction, and the valve closing body (13) with the valve seat area (26, 26 ') cooperates, characterized in that the guide area (31) has a plurality of guide sections (51) which are interrupted in the circumferential direction by flow passages (27) and which extend so far away from the valve seat area (26, 26') in the axial direction, that they protrude a maximum of 150 μm over the spherical equator (52 ') of the valve closing body (13) when the valve closing body (13) is in contact with the valve seat area (26, 26').
10. Brennstoffeinspritzventil nach Anspruch 9, dadurch gekennzeichnet, daß die Führungsabschnitte (51) eine geringe Wölbung mit einem Radius aufweisen, der weitgehend dem Radius des Ventilschließkörpers (13) entspricht. 10. Fuel injection valve according to claim 9, characterized in that the guide sections (51) have a slight curvature with a radius which largely corresponds to the radius of the valve closing body (13).
EP98959704A 1997-12-20 1998-10-02 Method for producing a valve seat body for a fuel injection valve, and corresponding fuel injection valve Expired - Lifetime EP1001863B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19757117A DE19757117A1 (en) 1997-12-20 1997-12-20 Valve seat body fabrication method for fuel injection valve
DE19757117 1997-12-20
PCT/DE1998/002928 WO1999032259A1 (en) 1997-12-20 1998-10-02 Method for producing a valve seat body for a fuel injection valve, and corresponding fuel injection valve

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EP1001863A1 true EP1001863A1 (en) 2000-05-24
EP1001863B1 EP1001863B1 (en) 2002-05-15

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EP98959704A Expired - Lifetime EP1001863B1 (en) 1997-12-20 1998-10-02 Method for producing a valve seat body for a fuel injection valve, and corresponding fuel injection valve

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US (1) US6189816B1 (en)
EP (1) EP1001863B1 (en)
JP (1) JP2001513165A (en)
KR (1) KR20000071199A (en)
BR (1) BR9807436A (en)
DE (2) DE19757117A1 (en)
ES (1) ES2177104T3 (en)
WO (1) WO1999032259A1 (en)

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Also Published As

Publication number Publication date
BR9807436A (en) 2000-04-18
WO1999032259A1 (en) 1999-07-01
DE19757117A1 (en) 1999-06-24
ES2177104T3 (en) 2002-12-01
EP1001863B1 (en) 2002-05-15
KR20000071199A (en) 2000-11-25
US6189816B1 (en) 2001-02-20
DE59804149D1 (en) 2002-06-20
JP2001513165A (en) 2001-08-28

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