EP2221470B1 - Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils - Google Patents

Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils Download PDF

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Publication number
EP2221470B1
EP2221470B1 EP09425059A EP09425059A EP2221470B1 EP 2221470 B1 EP2221470 B1 EP 2221470B1 EP 09425059 A EP09425059 A EP 09425059A EP 09425059 A EP09425059 A EP 09425059A EP 2221470 B1 EP2221470 B1 EP 2221470B1
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EP
European Patent Office
Prior art keywords
bushing
axial
anchor
ring
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
EP09425059A
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English (en)
French (fr)
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EP2221470A1 (de
Inventor
Mario Ricco
Sergio Stucchi
Raffaele Ricco
Onofrio De Michele
Antonio Gravina
Domenico Lepore
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Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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Publication date
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Priority to AT09425059T priority Critical patent/ATE507390T1/de
Priority to DE602009001184T priority patent/DE602009001184D1/de
Priority to EP09425059A priority patent/EP2221470B1/de
Publication of EP2221470A1 publication Critical patent/EP2221470A1/de
Application granted granted Critical
Publication of EP2221470B1 publication Critical patent/EP2221470B1/de
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    • 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
    • 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
    • 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
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other

Definitions

  • the present invention relates to a method for manufacturing a fuel injector servo valve, in which 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 using the aforesaid method.
  • Servo valves of the type just described see for example DE 102006021741 , have a discharge duct, which exits on a lateral surface of the stem, in such a way that, in the closing position, the bushing will be subject 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 anchor, actuated by an electric actuator.
  • the aim of the invention is to provide a method for manufacturing a servo valve of the type described above, which will solve the problems indicated above and will present 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, slidable in which is a rod for control of the injection (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 anchor 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 anchor 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 outer annular portion defining a flange 24 made of a single piece with the pin 12.
  • Set between a plane top surface 17a of the anchor 17 and the polar surface 20 of the core 19, is a thin lamina 13 made of non-magnetic material in order to guarantee a certain gap between the anchor 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 ringnut 36, screwed on an internal thread 37 of the cavity 34.
  • the anchor 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 radical stretch of duct 44.
  • two or more radial stretches 44 can be provided, set at a constant angular distance 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 towards the anchor 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 element 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 closing position of the open/close element 47 requires a greater travel of the bushing 41 towards the connector 49, but the diameter of the sealing surface at the most remains defined by the diameter of the cylindrical stretch of the annular groove 50.
  • the anchor 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 outer portion 58, with cross section tapered towards the outside.
  • the central portion 56 defines an axial hole 59, by means of which the anchor 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, is referred to hereinafter also as "intermediate collar", and has an outer diameter smaller than that of the open/close element 47 and than that of the flange 60.
  • the bushing 41 carries, in a fixed position, a first element for axial stop of the anchor 17: said first element is a shoulder 62 that is set at the bottom of the intermediate collar 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 with respect to the internal surface 40 of the bushing 41 in order to reduce the portion to be ground so as to provide 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 anchor 17 and is set in a position such as to allow the anchor 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 anchor 17 and the bushing 41.
  • the bushing 41 is provided with a ring-shaped terminal portion 71, which is referred to also hereinafter as "end collar", is adjacent to the intermediate collar 61 and has an outer diameter smaller than that of the intermediate collar 61 so as to form an axial step or shoulder 72.
  • the end collar 71 is made of a single piece with the remaining part of the bushing 41, defines the seat 40a, and terminates axially with an end edge 70.
  • the end collar 71 carries a ring 73 defining a spacer between the flange 24 and the shoulder 72.
  • the ring 73 has an axial height greater than that of the end collar 71, i.e., greater than the axial distance between the end edge 70 and the shoulder 72: consequently, the ring 73 has an internal lateral surface 78, which is fitted on the end collar 71 and comprises a portion 79, which projects axially with respect to the end edge 70.
  • the ring 73 has a base surface 74, which is in contact with the shoulder 72 and is plane.
  • the ring 73 moreover has a plane surface 75, opposite and parallel to the surface 74.
  • the flange 24 has a plane surface 65 that is set in contact with the surface 75 of the ring 73, in particular by the thrust of the spring 23.
  • the ring 73 has an outer diameter greater than that of the intermediate collar 61, so that an annular portion 76 of the surface 74 projects radially outwards with respect to the intermediate collar 61 and faces axially the surface 17a.
  • the annular portion 76 constitutes the second of the two elements provided for axial stop of the travel of the anchor 17, with respect to the bushing 41.
  • the axial distance between the annular portion 76 and the shoulder 62 is greater than the axial thickness of the portion 56 of the anchor 17: the difference between said axial distance and said axial thickness constitutes the maximum play or relative displacement in the axial direction between the anchor 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.
  • the travel, or lift, of the open/close element 47 is defined by the axial distance between the annular portion 76 of the surface 74 of the ring 73 and the lamina 13.
  • the core 19 attracts the anchor 17, which at the start performs a loadless travel, or pre-travel, without affecting the displacement of the bushing 41, until it brings its surface 17a into contact with the annular portion 76 of the surface 74 of the ring 73.
  • the action of the electromagnet 16 on the anchor 17 overcomes the force of the spring 23, via the interposition of the ring 73 and of the flange 24, and the anchor 17 draws the bushing 41 axially towards the core 19, to enable the open/close element 47 to perform its opening travel: consequently, also by the pressure of the fuel in the chamber 46, the open/close element 47 lifts up and the servo valve 5 opens.
  • the anchor 17 performs a travel greater than that of the bushing 41; i.e., in opening it performs along the collar 61 a pre-travel equal to the play between the surface 17a of the anchor 17 and the annular portion 76 of the surface 74 of the ring 73.
  • the annular portion 76 of the surface 74 remains in contact with the surface 17a of the anchor 17, which moves away from the polar surface 20, moving substantially together with the bushing 41.
  • the open/close element 47 impacts 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 anchor 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 anchor 17 and the shoulder 62 of the flange 60.
  • the impact of the anchor 17 against the bushing 41 is obtained 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 anchor 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 ring 73 is fixed to the end collar 71 by means of a welding device, preferably of the laser type, not shown in the attached figures, after the surface 74 of the ring 73 has been brought into contact against the shoulder 72, which defines an axial reference position for the ring 73 during welding.
  • Said welding is carried out by forming weld material along a circumference between the end edge 70 and the portion 79.
  • the weld material defines a continuous bead 77 along the aforesaid circumference, which has an internal diameter greater than the diameter of the seat 40a.
  • welding is carried out so that it is in view, without any need for phasing between the welding device and the bushing 41, i.e., without having to set the welding device in a pre-defined angular position with respect to the bushing 41.
  • spot welding could be sufficient.
  • 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 outer 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 slide axially into the bushing 41 as far as the compartment 48.
  • the body 12a can be fixed to the ring 73 by means of a continuous bead, or else by spot welding, with a weld between the surface 75 of the ring 73 and the lateral surface of the flange 24. These two types of welding do not require any phasing either.
  • Figures 3 and 4 show respective variants 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 body 12a is absent, the spring 23 acts directly on the surface 75 of the ring 73, and the ring 73 has an axial height lower than that of the terminal portion 71, so that the terminal portion 71 comprises one end 70a, which projects axially with respect to the surface 75 and defines a centring for mounting the spring 23.
  • bead 77 is provided along a circumference between the surface 75 and the cylindrical lateral surface of the end 70a, still remaining in view; as an alternative to the continuous bead, it may be understood that once again a spot-welding operation is possible, provided that the resistance to the action of thrust of the anchor 17 is guaranteed even so.
  • the terminal portion 71 is made of a single piece with the intermediate collar 61, as in the solution of Figure 2 , so that the compartment 48 communicates directly with the cavity 22.
  • the terminal portion 71 forms part of an axially perforated pin, i.e., a sleeve 81, fixed to the remaining part of the bushing 41, preferably via welding.
  • the outer 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, in a position corresponding to the intermediate collar 61.
  • welding of the sleeve 81 is carried out by forming weld material 77a along a circumference between the shoulder 72 and the external lateral surface of the sleeve 81, after the sleeve 81 has been positioned axially with respect to the remaining part of the bushing 41, for example, by being rested on a projecting element (not illustrated) set in the central hole of the open/close element 47.
  • a chamfered portion or recess 83 is provided on the ring 73 in a position corresponding to the edge between the surfaces 74 and 78 so as to prevent any interference between the ring 73 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 lateral surface of the seat 40a, using a welding device appropriately shaped so as to slide axially into the bushing 41 as far as the compartment 48. Also these welds of the sleeve 81 to the intermediate collar 61 do not require any phasing, i.e., any particular angular positioning between the bushing 41 and the welding device, given that welding is carried out along a circumference, preferably with a continuous bead.
  • 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 of the anchor 17, and the terminal portion 71, the latter set in a position adjacent to the guide portion 61 and with an outer diameter smaller than that of the guide portion 61 so as to define the shoulder 72.
  • 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 ring 73 is fitted on the terminal portion 71 until it is brought to bear upon the shoulder 72 so as to provide an axial reference position for the stop element defined by the annular portion 76.
  • the ring 73 is mounted after the anchor 17 has been fitted on the guide portion 61 and the anchor 17 has been left to rest on the shoulder 62.
  • the ring 73 is welded with weld material via an appropriate welding device, forming weld material, i.e., the bead 77, along a circumference between the ring 73 and the terminal portion 71.
  • the anchor 17, the axial position of the shoulder 62, and the axial position of the annular portion 76 have been previously chosen so as to allow for a pre-defined freedom of axial movement of the anchor 17 equal to the axial play established in the design stage.
  • the anchor 17 is chosen from among a plurality of anchors that are divided into classes on the basis of their axial thickness.
  • the body 12a is provided, with the flange 24 for supporting the spring 23, and with the pins 12 and 63.
  • the pin 63 of the body 12a is inserted in the seat 40a of the bushing 41.
  • 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 on the end 70a, until the spring 23 itself comes to rest on the flange 24 or else, respectively, on the surface 75 of the ring 73.
  • the bead 77 does not modify the outer profile of the bushing 41 and of the body 12a, nor does it alter the surfaces 39, 40 of the stem 38 and of the bushing 41, nor does it vary the distance between the shoulder 62 and the annular portion 76 of the surface 74.
  • weld material remains in view in order to facilitate not only carrying out thereof, but also quality control.
  • weld material defined by the beads 77, 77a, 77b does not create any interference during the movement of the anchor 17 in the space provided between the shoulder 62 and the annular portion 76.
  • the shoulder 72 defines a precise reference position for the ring 73 and enables transfer of the loads from the spring 23 to the bushing 41 without affecting the welding areas. Also the transfer of the loads between the spring 23 and the anchor 17 occurs through the ring 73 without affecting the welding areas.
  • the anchor 17 can be defined by a disk with 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 applied stop element fixed on the remaining part of the bushing 41.
  • the anchor 17 could be fitted on the guide portion 61 before application and fixing of said stop element; possibly, if the radial dimensions of the remaining part of the bushing 41 so allow, the anchor 17 could be fitted on the side of the open/close element 47 (instead of on the side of the terminal portion 71), until they reach the guide portion 61, even after the ring 73 has been welded.
  • stop element defined by the annular portion 76 of the surface 74 could be an applied element fixed to the ring 73 and/or could be set at an axial distance apart from the shoulder 72.
  • the ring 73 can also be welded to the bushing 41 by means of weld material along a circumference between the annular portion 76 of the surface 74 and the lateral surface of the collar 61.
  • the anchor 17 is provided with an appropriate chamfered portion or recess in a position corresponding to the edge that corresponds to the weld material, for housing said material and preventing interference with the axial travel of the anchor 17.
  • the pin 63 could engage the portion 79 of the internal lateral surface 78, instead of engaging the terminal portion 71.
  • the open/close element 47 could be a separate piece fixed to the remaining part of the bushing 41.
  • the perforated pin 81 could have dimensions different from the ones shown: for example, it could have an internal diameter substantially equal to that of the surface 40 and/or could be set so that it rests axially on the guide portion 61.
  • a spring could be set between the surface 57 of the anchor 17 and the flange 33 so as to bring the surface 17a of the anchor 17 into 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-load much lower than those of the spring 23 so as not to affect the dynamics of impact of the anchor 17 against the bushing 41 during the phases of rebound described above.
  • the sizing of the bead, or of the weld spots will have to be chosen taking into account operation of the servo valve in fatigue conditions, 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)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (20)

  1. Verfahren zur Herstellung eines Servoventils (5) für eine Kraftstoffeinspritzvorrichtung, wobei das Servoventil ein Öffnungs-/Schließelement (47) umfasst, das im Hinblick auf eine Hülse (41) feststehend ist, die dazu konstruiert ist, sich um eine bestimmte axiale Strecke entlang eines feststehenden Schafts (38) zu bewegen, um einen Ableitungskanal (43, 44) zu öffnen/schließen, der von einer Seitenfläche (39) des Schafts (38) ausgeht, wobei eine Feder (23) vorgesehen ist, um die Hülse (41) in die Schließposition zu bringen, wobei die Hülse (41) einem im Wesentlichen null betragenden axialen Druck durch den Kraftstoff ausgesetzt ist; wobei die Hülse (41) unter der Steuerung eines axial gelochten Ankers (17) beweglich ist, der von einem elektrischen Stellglied (15) entgegen der Wirkung der Feder (23) betätigt wird;
    wobei das Verfahren die folgenden Schritte umfasst:
    - Bereitstellen der Hülse (41) auf eine solche Weise, dass sie aufweist:
    a) einen Führungsabschnitt (61) zum Anschließen des Ankers (17), und
    b) einen Endabschnitt (71) angrenzend an den Führungsabschnitt (61) und mit einem Außendurchmesser, der kleiner ist als derjenige des Führungsabschnitts (61), um eine axiale Schulter (72) zwischen dem Führungsabschnitt (61) und dem Endabschnitt (71) zu bilden;
    - Anbringen des Ankers (17) am Führungsabschnitt (61);
    - Bereitstellen eines ersten Elements (62) in einer feststehenden Position an der Hülse (41) auf einer Seite des Führungsabschnitts (61) für einen axialen Anschlag des Ankers (17);
    - Bereitstellen eines zweiten Elements (76) auf der anderen Seite des Führungsabschnitts (61) für einen axialen Anschlag des Ankers (17); wobei das zweite Element (76) durch einen Ring (73) in eine feststehende Position gebracht wird, der am Endabschnitt (71) angebracht wird, bis er in Anlage auf der axialen Schulter (72) in eine axiale Bezugsposition gebracht ist;
    - derartiges Wählen der Dicke des Ankers (17) und der axialen Positionen des ersten und zweiten Elements (62, 76), dass dem Anker (17) am Führungsabschnitt (61) eine vorbestimmte axiale Bewegungsfreiheit ermöglicht ist; und
    - Anschweißen des Rings (73) in der axialen Bezugsposition mittels Schweißmaterial entlang eines Umfangs zwischen dem Ring (73) und dem Endabschnitt (71).
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Anker (17) am Führungsabschnitt (61) angebracht wird, bevor der Ring (73) am Endabschnitt (71) angebracht wird.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das erste Element (62) an der Hülse (41) bereitgestellt wird, bevor der Anker (17) angebracht wird.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anker (17) aus mehreren Ankern ausgewählt wird, die auf Grundlage des Werts ihrer axialen Dicke in Klassen unterteilt sind.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das erste Element (62) durch eine Schulter definiert ist, die einstückig mit der Hülse (41) hergestellt ist.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das zweite Element durch einen äußeren ringförmigen Abschnitt (76) definiert ist, der einstückig mit dem Ring (73) hergestellt ist.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der äußere ringförmige Abschnitt (76) an eine außenliegende Seitenfläche des Führungsabschnitts (61) geschweißt wird, und dass eine Ausnehmung am Anker (17) an einer dem Schweißmaterial entsprechenden Stelle vorgesehen ist.
  8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Endabschnitt (71) einstückig mit dem übrigen Teil der Hülse (41) hergestellt ist.
  9. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Endabschnitt (71) bereitgestellt wird, indem ein gelochtes Teil (81) am übrigen Teil der Hülse (41) angelegt und befestigt wird.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass das gelochte Teil (81) mittels Schweißen entlang eines Umfangs befestigt wird.
  11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass die axiale Schulter (72) an eine außenliegende Seitenfläche des gelochten Teils (81) geschweißt wird; und dass eine Ausnehmung zwischen einer Grundfläche (74) und einer innenliegenden Seitenfläche (78) des Rings (73) zur Aufnahme des Schweißmaterials vorgesehen wird.
  12. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass das gelochte Teil einen weiteren Endabschnitt (63a) umfasst, der koaxial zum Endabschnitt (71) und diesem entgegengesetzt ist, in einen axialen Raum (48) der Hülse (41) eingesetzt ist, und an die innenliegende Fläche des axialen Raums (48) geschweißt ist.
  13. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Endabschnitt (71) eine axiale Höhe hat, die größer ist als diejenige des Rings (73), um ein Ende (70a) aufzuweisen, das im Hinblick auf den Ring (73) axial vorsteht.
  14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass das Ende (70a) eine Zentrierung zur Anbringung der Feder (23) bildet, und dass der Ring (73) eine axiale Sitzfläche für die Feder (23) bildet.
  15. Verfahren nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass es darüber hinaus die folgenden Schritte umfasst:
    - Bereitstellen eines Zwischenkörpers (12a), der Folgendes aufweist:
    a) einen Flansch (24), der eine Sitzfläche für die Feder (23) bildet,
    b) einen Verbindungsstift (63), und
    c) einen Zentrierstift (12) für die Feder (23), wobei der Zentrierstift (12) koaxial zum Verbindungsstift (63) und diesem entgegengesetzt ist;
    - Einstecken des Verbindungsstifts (63) in einen axialen Sitz (40a).
  16. Verfahren nach Anspruch 15, dadurch gekennzeichnet, dass der Ring (73) eine axiale Höhe hat, die größer ist als diejenige des Endabschnitts (71) und eine innenliegende Seitenfläche mit einem ringförmigen Abschnitt (79) hat, der im Hinblick auf den Endabschnitt (71) axial vorsteht; wobei der Flansch (24) axial auf dem Ring (73) aufliegt.
  17. Verfahren nach Anspruch 16, dadurch gekennzeichnet, dass das Anschweißen des Rings (73) entlang eines Umfangs zwischen einem axialen Endrand (70) des Endabschnitts (71) und dem ringförmigen Abschnitt (79) erfolgt.
  18. Verfahren nach einem der Ansprüche 15 bis 17, dadurch gekennzeichnet, dass der Zwischenkörper (12a) mittels Schweißmaterial entlang eines Umfangs an den Endabschnitt (71) oder den Ring (73) geschweißt wird.
  19. Verfahren nach einem der Ansprüche 15 bis 17, dadurch gekennzeichnet, dass der Zwischenkörper (12a) durch kraftschlüssiges Einsetzen des Verbindungsstifts (63) in den axialen Sitz (40a) befestigt wird.
  20. Servoventil für eine Kraftstoffeinspritzvorrichtung, das mit dem Verfahren nach einem der vorhergehenden Ansprüche erhalten wird.
EP09425059A 2009-02-16 2009-02-16 Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils Active EP2221470B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT09425059T ATE507390T1 (de) 2009-02-16 2009-02-16 Verfahren zur herstellung eines kraftstoffeinspritzservoventils
DE602009001184T DE602009001184D1 (de) 2009-02-16 2009-02-16 Verfahren zur Herstellung eines Kraftstoffeinspritzservoventils
EP09425059A EP2221470B1 (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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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ATE507390T1 (de) 2011-05-15
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