EP2218903B1 - Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils - Google Patents

Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils Download PDF

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Publication number
EP2218903B1
EP2218903B1 EP09425061A EP09425061A EP2218903B1 EP 2218903 B1 EP2218903 B1 EP 2218903B1 EP 09425061 A EP09425061 A EP 09425061A EP 09425061 A EP09425061 A EP 09425061A EP 2218903 B1 EP2218903 B1 EP 2218903B1
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EP
European Patent Office
Prior art keywords
armature
bushing
ring
axial
terminal portion
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.)
Active
Application number
EP09425061A
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English (en)
French (fr)
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EP2218903A1 (de
Inventor
Mario Ricco
Raffaele Ricco
Sergio Stucchi
Onofrio De Michele
Antonio Gravina
Chiara Altamura
Marcello Gargano
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.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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Priority to DE602009001183T priority Critical patent/DE602009001183D1/de
Priority to AT09425061T priority patent/ATE507389T1/de
Priority to EP09425061A priority patent/EP2218903B1/de
Publication of EP2218903A1 publication Critical patent/EP2218903A1/de
Application granted granted Critical
Publication of EP2218903B1 publication Critical patent/EP2218903B1/de
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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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration

Definitions

  • the present invention relates to a method for manufacturing a fuel injector servo valve, wherein the servo valve comprises a bushing designed to move for a certain axial travel along a fixed stem between an opening position and a closing position.
  • the invention moreover relates to a servo valve produced applying the aforesaid method.
  • Servo valves of the type just described have a discharge duct that exits on a lateral surface of the stem in such a way that, in the closing position, the bushing is subjected to a substantially zero axial thrust exerted by the pressure of the fuel. Consequently, the servo valve is of a balanced type and requires relatively small forces for opening and closing it.
  • the bushing is brought into the closing position by a corresponding spring and is controlled so as to be brought into the opening position, against the action of the spring, by a disk-shaped armature, actuated by an electric actuator.
  • DE 10 2006 021741 A1 corresponds to the preamble of claim 1 and discloses a control valve, which opens or closes a connection from a control chamber into a fuel return line by positioning a closing element in a seat or by opening the seat.
  • a bore is embodied in the closing element, and a pin is received in the bore.
  • the diameter of the bore essentially corresponds to the diameter of the seat.
  • US-A-5299776 discloses a small axial lost motion connection between an armature disk and a needle valve.
  • the armature disk is axially captured on needle valve between a flange and a spring guide retainer.
  • the latter is a ring that has a press fit on the needle valve.
  • the spring guide retainer is pushed onto the needle valve a distance that creates a desired amount of axial lost motion between the armature disk and the needle valve. Once that the desired amount of axial lost motion has been attained, the spring guide retainer is joined to needle valve, such as by welding.
  • the aim of the invention is to provide a method for manufacturing a servo valve of the type described above that will solve the problems referred to above and present a high reliability and a limited cost.
  • the above purpose is achieved by a method for manufacturing a fuel injector servo valve, as defined in Claim 1.
  • a hollow body or casing of a fuel injector for an internal-combustion engine in particular a diesel engine.
  • the casing 2 extends along a longitudinal axis and terminates with a nozzle or nebulizer (not visible in the figure) for injection of the fuel at a high pressure.
  • the casing 2 has an axial cavity 34, which houses a dosage servo valve 5, comprising a valve body 7 having an axial hole, in which a rod for control of fuel injection is able to slide
  • Said rod and said axial hole are not visible in Figure 1 ).
  • Said rod is controlled by the pressure of the fuel in a control chamber, which is contained in the valve body 7 and is not visible in Figure 1 either.
  • An electric actuator 15 is housed in a portion of the cavity 34 and comprises an electromagnet 16, designed to control an armature 17 having the shape of a notched disk.
  • the electromagnet 16 comprises a magnetic core 19, which has a polar surface 20 perpendicular to the axis of the casing 2 and is held in position by a support or jacket 21.
  • the electric actuator 15 has an axial cavity 22 in communication with the discharge of the servo valve 5 for recirculation of the fuel towards the usual tank.
  • a helical compression spring 23 housed in the cavity 22 is a helical compression spring 23, pre-loaded so as to exert an action of thrust on the armature 17 in a direction opposite to the attraction exerted by the electromagnet 16.
  • the spring 23 acts on an intermediate body, designated as a whole by 12a, which comprises a pin 12 defining a centring element for one end of the spring 23.
  • the body 12a further comprises an external annular portion defining a flange 24 made of a single piece with the pin 12.
  • a thin lamina 13 made of non-magnetic material in order to guarantee a certain gap between the armature 17 and the core 19.
  • the valve body 7 comprises a flange 33, housed in the cavity 34 and kept fixed, in a fluid-tight way, against a shoulder (not visible in the figure) by a threaded ring nut 36, screwed on an internal thread 37 of the cavity 34.
  • the armature 17 is associated to a bushing 41, guided axially by a stem 38, which is made of a single piece with the flange 33 of the valve body 7 and extends in cantilever fashion from the flange 33 itself towards the cavity 22.
  • the stem 38 has a cylindrical lateral surface 39, which guides axial sliding of the bushing 41.
  • the bushing 41 has a cylindrical internal surface 40, coupled to the lateral surface 39 of the stem 38 substantially in a fluid-tight way, for example with a diametral play of less than 4 ⁇ m, or else by means of interposition of annular seal elements (not illustrated).
  • the fuel comes out of the control chamber of the body 7 through an outlet duct 43, made axially inside the flange 33 and the stem 38.
  • the duct 43 is in communication with at least one substantially radial stretch of duct 44.
  • two or more radial stretches 44 can be provided, set at constant angular distances apart, which give out into an annular chamber 46, formed by a groove of the lateral surface 39 of the stem 38.
  • two stretches 44 are provided, inclined in the direction of the armature 17.
  • the annular chamber 46 is obtained in an axial position adjacent to the flange 33 and is opened/closed by a terminal portion of the bushing 41: said terminal portion defines an open/close element 47 for said annular chamber 46 and hence also for the radial stretches of duct 44.
  • the open/close element 47 is made of a single piece with the remaining part of the bushing 41 and co-operates with a corresponding stop for closing the servo valve 5.
  • the open/close element 47 has an internal surface 45 shaped like a truncated cone that is flared towards the end edge and is designed to stop against a connector 49 shaped like a truncated cone set between the flange 33 and the stem 38.
  • the connector 49 comprises two surface portions shaped like a truncated cone 49a and 49b, separated by an annular groove 50, which has a cross section shaped substantially like a right angle; i.e., it comprises an internal cylindrical stretch and an external stretch orthogonal to the axis of the casing 2.
  • the surface shaped like a truncated cone 45 of the open/close element 47 engages in a fluid-tight way the portion of surface shaped like a truncated cone 49a, against which it stops in the closing position.
  • the armature 17 is at least in part made of a magnetic material and is formed by a distinct piece, i.e., a piece separate from the bushing 41. It comprises a central portion 56 having a plane bottom surface 57, and a notched external portion 58, with section tapered outwards.
  • the central portion 56 defines an axial hole 59, by means of which the armature 17 engages with a certain radial play along a guide portion 61 forming part of the bushing 41.
  • the portion 61 projects axially with respect to a flange 60 of the bushing 41 and has a smaller external diameter than the open/close element 47 and than the flange 60.
  • the bushing 41 has, in a fixed position, a first element for axial stop of the armature 17.
  • Said first element is a shoulder 62 that is located at the bottom of the guide portion 61 and, in the particular examples illustrated, is made of a single piece with the bushing 17, being defined by the flange 60.
  • the body 12a comprises an axial pin 63 for connection with the bushing 41: the pin 63 is made of a single piece with the flange 24, projects axially from the flange 24 in a direction opposite to the pin 12, and is inserted in an axial seat 40a of the bushing 41.
  • the seat 40a has a diameter slightly greater than the internal surface 40 of the bushing 41 in order to reduce the portion to be ground so as to ensure fluid tightness with the surface 39 of the stem 38.
  • the body 12a is provided with an axial hole 64.
  • the shoulder 62 constitutes the first of two elements provided for axial stop of the armature 17 and is located in a position such as to allow the armature 17 to perform a pre-set travel greater than the travel of the open/close element 47, i.e., a relative axial displacement between the armature 17 and the bushing 41.
  • the bushing 41 comprises a terminal portion 71, which is an axial extension or prolongation of the guide portion 61, defines the seat 40a, and has an external diameter and an internal diameter substantially equal to those of the guide portion 61.
  • the terminal portion 71 is preferably made of a single piece with the guide portion 61, which is in turn made of a single piece with the remaining part of the bushing 41 in the embodiment shown in Figure 1 and 2 .
  • the terminal portion 71 carries a ring 73 in a fixed position and has a portion of lateral surface 79, which projects axially with respect to the ring 73 and is welded to the ring 73, as will be explained more fully in what follows.
  • the internal lateral surface 78 of the ring 73 is fitted on the terminal portion 71 in a slidable way, i.e., without resting on axial shoulders, and is kept in a fixed position exclusively by weld material applied along a circumference and defined in particular by a weld bead 77.
  • weld spots could be envisaged.
  • the flange 24 has a plane surface 65, which is kept in axial contact against the terminal portion 71 by the thrust of the spring 23 and does not come into contact against the weld bead 77 and/or against the ring 73.
  • the ring 73 is delimited axially by two opposite surfaces, which are designated by the reference numbers 75 and 76 and are plane.
  • the surface 76 faces axially the surface 17a and constitutes the second of the two elements provided for axial stop of the travel of the armature 17, with respect to the bushing 41.
  • the axial distance between the surface 76 and the shoulder 62 is greater than the axial thickness of the portion 56 of the armature 17: the difference between said axial distance and said axial thickness constitutes the maximum play or relative displacement in the axial direction between the armature 17 and the bushing 41.
  • the open/close element 47 When the electromagnet 16 is not energized, the open/close element 47 is kept resting with its surface shaped like a truncated cone 45 against the portion shaped like a truncated cone 49a of the connector 49 by the thrust of the spring 23, which acts through the flange 24 and the ring 73 so that the servo valve 5 is closed.
  • the annular chamber 46 In the annular chamber 46 there is set up a fuel pressure, the value of which is substantially equal to the supply pressure of the injector. In this condition, normally the armature 17 rests against the shoulder 62, and the lamina 13 rests by gravity on the surface 17a of the armature 17.
  • the travel, or lift, of the open/close element 47 is defined by the axial distance between the surface 76 of the ring 73 and the lamina 13.
  • the core 19 attracts the armature 17, which at the start performs a loadless travel, or pre-travel, without affecting the displacement of the bushing 41, until its surface 17a comes into contact with the surface 76 of the ring 73.
  • the armature 17 performs a travel greater than that of the bushing 41; i.e., in opening, it performs a pre-travel along the collar 61 equal to the play G between the surface 17a of the armature 17 and the surface 76 of the ring 73.
  • the surface 76 remains in contact with the surface 17a of the armature 17, which moves away from the polar surface 20, moving substantially together with the bushing 41.
  • the open/close element 47 strikes, with its conical surface 45, against the portion of surface shaped like a truncated cone 49a of the connector 49 of the valve body 7.
  • the open/close element 47 rebounds, overcoming the action of the spring 23.
  • the armature 17 continues its travel towards the valve body 7, i.e., towards the shoulder 62, recovering precisely the play that had formed between the plane surface 57 of the portion 56 of the armature 17 and the shoulder 62 of the flange 60.
  • the impact of the armature 17 against the bushing 41 occurs during the first rebound, immediately following upon de-energization of the electromagnet 16 so that both said first rebound and the possible subsequent rebounds are attenuated.
  • the impact between the armature 17 and the shoulder 62 of the bushing 61 can in particular occur upon return of the open/close element 47 into the closing position, i.e., at the end of the first rebound. In this case, the rebounds of the open/close element 47 subsequent to the first are blocked.
  • the body 12a is removably connected to the bushing 41 by simply inserting the pin 63 into the seat 40a in so far as the external diameter of the pin 63 approximates by defect the diameter of the seat 40a.
  • the pin 63 can be sized in such a way as to be connected to the bushing 41 in a fixed position, for example by means of forced interference fit into the seat 40a; or else by welding between a terminal edge 80 of the pin 63 and the seat 40a using a welding device appropriately shaped so as to enter axially into the bushing 41 as far as the compartment 48; or else via an external welding between the surfaces 79 and 65.
  • This welding does not require any phasing; i.e., it does not require any particular angular positioning between the bushing 41 and the welding device.
  • the ring 73 is fixed to the terminal portion 71 by means of a welding device 72, preferably of the laser type, shown schematically in Figure 3 .
  • Said welding operation is performed by forming weld material along a circumference between the surfaces 79 and 75. Consequently, a sight welding is carried out, without any need for phasing between the device 72 and the bushing 41, i.e., without locating the device 72 in a particular predefined angular position with respect to the bushing 41.
  • Figure 4 shows a variant of the servo valve 5, the components of which are designated, where possible, by the same reference numbers as the ones used in Figure 2 .
  • the terminal portion 71 does not project axially with respect to the ring 73, but is located underneath the surface 75 so that the welding of the ring 73 is performed via the weld bead 77 between the internal lateral surface 78 of the ring 73 and an axial edge 70 of the terminal portion 71.
  • the pin 63 engages the axial hole of the ring 73, and the flange 24 is in contact against the surface 75.
  • the body 12a can be placed simply resting on the ring 73, or else be welded on the ring 73 along a circumference between the surface 75 and the lateral surface of the flange 24 in a way not illustrated.
  • the terminal portion 71 and the guide portion 61 form part of an axially perforated pin, i.e., a sleeve 81, fixed to the remaining part of the bushing 41, preferably via welding.
  • the external diameter of the sleeve 81 approximates by defect the diameter of the seat 40a so as to obtain a fit without interference.
  • the sleeve 81 comprises a terminal portion 63a, which is coaxial and opposed to the terminal portion 71 and engages the seat 40a or else the surface 40 in a position corresponding to the flange 60.
  • the shoulder 62 reaches the seat 40a or else the surface 40, forming a circular edge.
  • welding of the sleeve 81 is made by forming weld material 77a precisely along said circular edge, i.e., along a circumference between the shoulder 62 and the external lateral surface of the sleeve 81.
  • a chamfered portion or recess 83 is provided on the armature 17 in a position corresponding to the edge between the surface 57 and the internal surface of the hole 59 in order to prevent interference, between the armature 17 and the weld material 77a.
  • weld material 77b (represented with a dashed line) is formed between an end edge 80a of the terminal portion 63a and the internal surface 40 of the compartment 48, using a welding device appropriately shaped for entering axially into the bushing 41 as far as the compartment 48.
  • connection of the sleeve 81 does not require any phasing, i.e., any particular angular positioning between the bushing 41 and the welding device, since the welding operation is performed along a circumference forming the weld beads 77a or 77b.
  • a process of spot welding could be adopted.
  • the body 12a is absent, the spring 23 acts directly on the surface 75 of the ring 73, and the lateral surface 79 of the terminal portion 71 projects axially with respect to the ring 73 for a relatively large height so as to define a centring for mounting the end of the spring 23.
  • the method for manufacturing the servo valve 5 is performed in the following way.
  • a bushing is provided in such a way that it has the guide portion 61, for coupling the armature 17, and the terminal portion 71 that extends as axial prolongation of the guide portion 61.
  • the stop element defined by the shoulder 62 is provided in a fixed position on the bushing 41 on one side of the guide portion 61.
  • the armature 17 and the ring 73 are fitted one after another on the guide portion 61 and, respectively, on the terminal portion 71 downwards, i.e., towards the shoulder 62, maintaining the axis of the bushing 41 vertical. During these operations, the ring 73 is rested on the surface 17a of the armature 17.
  • the armature 17, with the ring 73 set onto it is raised with respect to the shoulder 62 by an amount G equal to the desired play to be obtained for the travel of the armature 17 between the shoulder 62 and the surface 76 so as to position the ring 73 in an axial reference position.
  • the ring 73 is welded to the terminal portion 71 via the device 72, forming weld material, i.e., the weld bead 77, along a circumference.
  • the servo valve 5 is mounted by fixing the valve body 7 in the cavity 34 and fitting the bushing 41 on the stem 38. Finally, the spring 23 is fitted on the pin 12 (or else around the lateral surface 79 if the body 12a is not envisaged) until the spring 23 itself rests on the flange 24 (or else on the surface 75 of the ring 73).
  • the weld bead 77 does not modify the external profile of the bushing 41 and of the body 12a, nor does it alter the surfaces 39, 40 of the stem 38 or of the bushing 41, nor again does it vary the distance between the shoulder 62 and the surface 76.
  • weld material is at sight in order to facilitate not only execution of the weld, but also quality control.
  • weld material defined by the beads 77, 77a, 77b does not create interference during the movement of the armature 17 in the space provided between the shoulder 62 and the surface 76.
  • the play that defines the axial travel of the armature 17 is regulated in a fine way directly during the production cycle by the lift of the push rods with respect to the bushing 41, when the ring 73 is located in its axial reference position under the thrust of the armature 17. Consequently, to obtain the desired play, it is not necessary to choose an armature 17 with a very precise axial thickness and/or calibrated spacers to be added beneath or above the armature 17.
  • the armature 17 can be defined by a disk of constant thickness.
  • the flange 60 can be eliminated so that the shoulder 62 is obtained in the thickness of the bushing 41.
  • the shoulder 62 can also be replaced by an additional stop element fixed on the remaining part of the bushing 41.
  • the stop element defined by the surface 76 could be an additional element fixed to the ring 73.
  • welds described may be made by spot welding rather than by continuous-bead welding.
  • a spring could be set between the surface 57 of the armature 17 and the flange 33 so as to keep the surface 17a of the armature 17 in contact with the surface 76 of the ring 73 when the electric actuator is not energized.
  • Said possible spring must have a stiffness and a pre-loading much lower than those of the spring 23 so as not to affect the dynamics of impact of the armature 17 against the bushing 41 during the phases of rebound described above.
  • the open/close element 47 could be a separate piece fixed to the remaining part of the bushing 41, and/or the sleeve 81 could have dimensions different from those shown.
  • the sizing of the weld bead or the weld spots will have to be made by taking into account the operation of the servo valve in conditions of fatigue for a sufficient number of cycles.

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

Claims (17)

  1. Verfahren zum Herstellen eines Kraftstoffeinspritz-Servoventils (5), wobei das Servoventil ein bezüglich einer Buchse (41) fixiertes Öffnungs-/SchließElement (47) aufweist, das dazu ausgelegt ist, sich über eine bestimmte axiale Strecke längs eines fixierten Schaftes (38) zu bewegen, um eine Auslassleitung (43, 44) zu öffnen bzw. zu schließen, sowie eine Feder (23) aufweist, die dazu vorgesehen ist, die Buchse (41) in der Schließstellung zu halten, wobei die Buchse (41) von dem Kraftstoff einem Druck von im wesentlichen Null ausgesetzt ist; wobei die Buchse (41) unter der Steuerung eines axial perforierten Ankers (17) bewegbar ist, welcher von einem elektrischen Betätigungsorgan (15) gegen die Wirkung der Feder (23) betätigt wird;
    wobei das Verfahren folgende Schritte aufweist:
    - Vorsehen der Buchse (41) in der Weise, dass sie folgendes aufweist:
    a) einen Führungsbereich (61) zur Kopplung des Ankers (17), und
    b) einen Endbereich (71), der an den Führungsbereich (61) angrenzt;
    - Vorsehen eines ersten Elementes (62) in einer festen Position an der Buchse (41) an der einen Seite des Führungsbereiches (61) als axialen Anschlag für den Anker (17);
    - Anbringen des Ankers (17) auf dem Führungsbereich (61) axial zu dem ersten Element (62) hin;
    - Vorsehen eines zweiten Elementes (76) auf der gegenüberliegenden Seite des Führungsbereiches (61) als axialen Anschlag für den Anker (17);
    dadurch gekennzeichnet,
    dass die Auslassleitung (43, 44) von einer seitlichen Oberfläche (39) des Schaftes (38) austritt und das zweite Element in einer festen Position von einem Ring (73) getragen ist;
    wobei das Verfahren ferner folgende Schritte aufweist:
    - Anbringen des Ringes (73) an dem Endbereich (71) axial zu dem Anker (17) hin;
    - Abstützen des Ringes (73) an dem Anker (17), wenn er an dem Endbereich (71) angebracht ist;
    - Anbringen des Ringes (73) in einer axialen Bezugsstellung, um ein gewünschtes axiales Spiel für den Anker (17) zwischen dem ersten und dem zweiten Element (62, 76) zu erhalten; wobei das Anbringen des Ringes (73) in der axialen Bezugsstellung durchgeführt wird, indem der Anker (17) bezüglich des ersten Elementes (62) um einen Betrag angehoben wird, der gleich dem gewünschten axialen Spiel ist, wobei der Ring (73) auf dem Anker (17) abgestützt ist;
    - Anschweißen des Ringes (73) an dem Endbereich (71) mit einem Schweißmaterial, wobei der Ring (73) in der axialen Bezugsstellung gehalten wird, wobei das Schweißmaterial längs des Umfanges aufbracht wird.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet,
    dass der Ring (73) während des Schweißens von dem Druck des Ankers (17) in der axialen Bezugsstellung gehalten wird.
  3. Verfahren nach Anspruch 2,
    dadurch gekennzeichnet,
    dass der Anker (17) mit Schubstangen angehoben wird.
  4. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    dass das erste Element (62) von einer ersten Schulter gebildet wird, die einstückig mit der Buchse (41) ausgebildet ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    dass das zweite Element von einer zweiten Schulter (76) gebildet wird, die einstückig mit dem Ring (73) ausgebildet ist.
  6. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    dass der Führungsbereich und der Endbereich (61, 71) Außendurchmesser besitzen, die im wesentlichen gleich sind.
  7. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    dass der Führungsbereich und der Endbereich (61, 71) Teile eines einziges Stückes (81) sind, das perforiert ist und an dem übrigen Teil der Buchse (41) mittels einer Schweißung längs des Umfanges befestigt ist.
  8. Verfahren nach Anspruch 7,
    dadurch gekennzeichnet,
    dass das perforierte Stück (81) einen weiteren Endbereich (63a) aufweist, der koaxial mit dem Endbereich (71) angeordnet ist und dem Endbereich (71) gegenüberliegt sowie mit der Innenoberfläche (40) eines axialen Loches der Buchse (41) in Eingriff steht.
  9. Verfahren nach Anspruch 8,
    dadurch gekennzeichnet,
    dass das perforierte Stück (81) geschweißt ist durch Anbringen von Schweißmaterial (77a) längs eines Umfanges zwischen dem ersten Element (62) und der äußeren seitlichen Oberfläche des perforierten Stückes (81); wobei eine Aussparung (83) an dem Anker (17) in einer Position vorgesehen ist, welche dem Rand zwischen einer axialen Oberfläche (57) und einer Innenoberfläche (59) des Ankers (17) entspricht, um das Schweißmaterial (77a) unterzubringen.
  10. Verfahren nach Anspruch 8,
    dadurch gekennzeichnet,
    dass das perforierte Stück (81) geschweißt ist durch Anbringen von Schweißmaterial (77b) längs eines Umfanges zwischen einer Endkante (80a) des weiteren Endbereiches (63a) und der Innenoberfläche (40).
  11. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    dass der Endbereich (71) eine seitliche Oberfläche (79) aufweist, welche axial bezüglich des Ringes (73) vorsteht, wenn der Ring (73) sich in seiner Bezugsstellung befindet; wobei das Schweißen des Ringes (73) längs eines Umfanges zwischen der seitlichen Oberfläche (79) des Endbereiches (71) und einer oberen Oberfläche (75) des Ringes (73) durchgeführt wird.
  12. Verfahren nach Anspruch 11,
    dadurch gekennzeichnet,
    dass die seitliche Oberfläche (79) des Endbereiches (71) eine Zentrierung zum Montieren von dem einen Ende der Feder (23) bildet,
    und dass die obere Oberfläche (75) eine axiale Abstützung für die Feder (23) bildet.
  13. Verfahren nach einem der Ansprüche 1 bis 11,
    dadurch gekennzeichnet,
    dass es ferner folgende Schritte aufweist:
    - Vorsehen eines dazwischenliegenden Körpers (12a), der folgendes aufweist:
    a) einen Flansch (24), der eine Abstützung für die Feder (23) bildet;
    b) einen Verbindungsstift (63); und
    c) einen Zentrierstift (12) für die Feder (23), wobei der Zentrierstift (12) koaxial zu dem Verbindungsstift (63) angeordnet ist und dem Verbindungsstift (63) gegenüberliegt; und
    - Einsetzen des Verbindungsstiftes (63) in einen axialen Sitz (40a).
  14. Verfahren nach Anspruch 13,
    dadurch gekennzeichnet,
    dass der axiale Sitz (40a) von dem Endbereich (71) gebildet wird.
  15. Verfahren nach Anspruch 14,
    dadurch gekennzeichnet,
    dass der dazwischenliegende Körper (12a) mit Schweißmaterial längs eines Umfanges zwischen einer Endkante (80) des Verbindungsstiftes (63) und dem axialen Sitz (40a) angeschweißt wird.
  16. Verfahren nach Anspruch 13 oder 14,
    dadurch gekennzeichnet,
    dass der dazwischenliegende Körper (12a) befestigt wird, indem man den Verbindungsstift (63) mit einer Presspassung in den axialen Sitz (40a) zwingt.
  17. Kraftstoffeinspritz-Servoventil, hergestellt durch Verwenden des Verfahrens nach einem der vorgehenden Ansprüche.
EP09425061A 2009-02-16 2009-02-16 Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils Active EP2218903B1 (de)

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Application Number Priority Date Filing Date Title
DE602009001183T DE602009001183D1 (de) 2009-02-16 2009-02-16 Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils
AT09425061T ATE507389T1 (de) 2009-02-16 2009-02-16 Verfahren zur herstellung eines kraftstoffeinspritzservoventils
EP09425061A EP2218903B1 (de) 2009-02-16 2009-02-16 Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils

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Application Number Priority Date Filing Date Title
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DE102018206504A1 (de) * 2018-04-26 2019-10-31 Robert Bosch Gmbh Kraftstoffinjektor

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US5299776A (en) * 1993-03-26 1994-04-05 Siemens Automotive L.P. Impact dampened armature and needle valve assembly
DE10063193A1 (de) * 2000-12-19 2002-06-27 Bosch Gmbh Robert Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE10100422A1 (de) * 2001-01-08 2002-07-11 Bosch Gmbh Robert Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE102006021741A1 (de) * 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE602007002813D1 (de) * 2007-07-30 2009-11-26 Fiat Ricerche Einspritzdüse mit ausgeglichenem Messservoventil für einen Verbrennungsmotor

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