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
• • 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
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/02—Fuel-injection apparatus having means for reducing wear
• • 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
  • F02M2200/90—Selection of particular materials
  • F02M2200/9053—Metals
• • 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
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
• • 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
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/0043—Two-way valves

Definitions

• DE 196 50 865 A1 relates to a solenoid valve whose armature is designed in several parts and has an armature disk and an anchor bolt.
• the anchor bolt is guided in a slider.
• a damping device is provided on the armature. With such a device exactly the required short switching times of the solenoid valve can be maintained.
• the solenoid valve is intended for use in injection systems with a high-pressure accumulator injection system (common rail).
• the anchor plate is guided on the anchor bolt.
• the anchor plate is on the one hand acted upon by a return spring and on the other hand secured by a shim, which is inserted in a recess on the circumference of the anchor bolt.
• an anchor assembly is proposed in which an anchor plate is fastened via a guide pin on the anchor bolt.
• the guide bolt is guided in a slot formed on the guide section of the anchor plate on the anchor bolt, so that the anchor plate is received with play in relation to the circumferential surface of the anchor bolt.
• Solenoid valves are used as actuators for cost and space reasons for high-pressure accumulator injection systems (common rail).
• the magnetic circuit of a solenoid valve consists of a magnetic coil received within a magnetic core and an armature which is connected to the switching element to be moved. There are several possibilities for the connection between the armature and the switching element.
• the anchor bolt of the anchor plate can be mounted via the previously mentioned securing disk. Due to the inevitable play between the lock washer, a recess in the end face of the anchor plate and the recess made on the circumference of the anchor bolt for receiving the lock washer, there are adverse effects on the dynamics of the solenoid valve.
• a possibility of connecting a two-part armature assembly between anchor plate and anchor bolt is also given by a cohesive joining method such as welding or gluing.
• the disadvantages of these connection options are on the one hand the cumbersome assembly, on the other hand in the low achievable strength and finally in the limited accuracy in which such a connection can be made.
• the formation of the anchor assemblies from two separate assemblies, namely anchor plate and anchor bolt is generally the advantage that the materials for the magnetic circuit, d. H. the material of the anchor plate and the material of the sealing function, which takes over the anchor bolt, can be optimally selected to the particular requirement. Therefore, it is desirable, taking into account the above-described boundary conditions, to use two-piece anchor assemblies that are selected according to the respective functions, optimally with regard to the material.
• an armature plate belonging to the magnetic circuit of the solenoid valve is formed by means of the MIM technique (Metal Injection Molding).
• MIM technique Metal Injection Molding
• at least one recess in the form of a groove or groove are attached to the circumference of an anchor bolt, for example, or on the circumference of a hydraulic switching element in the region of the connection point with the anchor plate.
• the recesses can be made in the region of the opening of the anchor plate, which are penetrated by the anchor bolt or by the hydraulic switching element, complementary to the outer geometry of the circumference of the anchor bolt or the hydraulic switching element.
• the geometry on the outer peripheral surface of the anchor bolt or the hydraulic switching element can be easily manufactured in the output part with low tolerances.
• the residual air gap required for solenoid valves can be set in the MIM tool and is created during metal injection molding, ie during the injection of a melt of a metallic material, without the need for reworking such as regrinding to adjust the residual air gap the end face of the anchor plate are required when it is joined to the anchor bolt or the hydraulic switching element via the MIM method.
• the armature plate is formed as part of the magnetic circuit with respect to the end face, which is usually designed plan, the anchor bolt or the hydraulic switching element reset, so that a step between the end face of the anchor plate passing through the anchor bolt and the hydraulic switching element results, which defines the residual air gap between the end face of the armature plate opposite the magnetic core and the front of the magnetic core opposite the armature plate.
• the material of the anchor bolt or the hydraulic switching element can be optimally selected according to the wear point.
• a magnetic material is preferably selected in order to apply high magnetic forces and to avoid eddy current losses.
• openings or recesses can be formed in arbitrary geometry to reduce the mass and for flow optimization, which can be formed without reworking the anchor plate.
• About such openings or recesses in a fuel injector from a pressure-relieved control chamber diverted control volume flow to a low-pressure side return without major flow resistance, in the event that the inventively proposed solenoid valve is used on a fuel injector whose receiving the solenoid valve cavity as a low-pressure return to the Abêtung used from the control room diverted fuel tax amount.
• connection between the anchor bolt or a hydraulic switching element and the integrally formed armature plate produced by means of the MIM method absorbs the acceleration forces which occur when the hydraulic switching element or the anchor bolt engages with the closing element received upon impact with the seat.
• acceleration forces occurring can have a plurality of recesses, grooves or a collar or multiple frets or a geometry with undercut on the anchor bolt or on the hydraulic switching element and complementary thereto on the inner circumferential surface of the anchor plate passing through opening or Be formed bore so that the acceleration forces are reliably absorbed.
• the use of the MIM method advantageously allows the formation of a metallic component made of a metallic material, on a component which is made of a different material, so that the individual components to be joined together, taking into account each optimized, adapted to the application branch material properties can be selected.
• FIGS. 2.1, 2.2, 2.3 and 2.4 show different variants of the MIM connection of the armature assembly
• FIG. 3 shows the use of the armature assembly proposed according to the invention on an outwardly opening valve (A-valve),
• FIG. 4 shows the use of the inventively proposed MIM connection within an armature assembly on a sleeve valve.
• FIG. 1 shows a pressure balanced 2/2 valve with which a fuel injector can be actuated and whose armature assembly has an armature plate and an armature bolt or a hydraulic shifting element and the armature plate is formed on the armature bolt by means of an MIM connection.
• a fuel injector 10 shown here only partially has an injector body 12.
• the fuel injector 10 includes a solenoid valve 14.
• the solenoid valve 14 includes a magnet pot 16 in which a solenoid coil 22 is received.
• the magnet pot 16 is traversed by a passage opening 18, which serves to receive a closing spring 20.
• Below the magnet pot 16 is an armature assembly 24 which includes an anchor plate 26.
• the anchor plate 26 may either be integrally formed on an anchor bolt or formed on a hydraulic switching element 28. The attachment between the anchor plate 26 and the anchor bolt 28 and the hydraulic switching element 28 takes place by way of a MIM connection 30 (Metal-Injected Molding).
• the anchor bolt 28 or the hydraulic switching element 28 of the armature assembly 24 is received in a bore 32 of the injector body 12.
• the anchor plate 26 of the armature assembly 24 is connected to a hydraulic switching element 28
• the lower end face of the hydraulic switching element 26 cooperates with a seat 36 formed in the injector body 12.
• a hydraulic chamber 40 into which, for example, a pressure relief line 38 is provided for pressure relief of an injection valve of the fuel injector 10 actuated control chamber.
• the anchor plate 26 which is integrally formed on the circumference of the anchor bolt 28 or a hydraulic switching element 28, attracted by the magnetic coil 22 and the seat 36 on the lower end face of the anchor bolt 28 and der Hydraulikschaltimplantations 28 open. This results in a pressure relief of the hydraulic chamber 40, so that a control amount via the discharge line 38, the hydraulic chamber 40 and the open seat 36 in a low-pressure side return 34 of the injector 12 can flow.
• the armature assembly 24 is pressed into the seat 36 by the closing spring 20 enclosed by the magnet pot 16, so that the flow connection between the relief chamber discharging the control chamber 38 and the low-pressure side return 34 through the closed seat 36 is interrupted in the injector 12.
• FIGS. 2.1, 2.2, 2.3 and 2.4 show variants of the MIM connection within an armature assembly.
• FIG. 2.1 shows that the anchor bolt 28 or the hydraulic shift element 28 has a circumference 52.
• the armature disk 36 of the anchor hole 24 is formed on the periphery 52 of the anchor bolt 28 and the hydraulic switching element 28.
• there is an outer contour 44 In the area in which the armature disk 36 of the anchor hole 24 is formed on the periphery 52 of the anchor bolt 28 and the hydraulic switching element 28, there is an outer contour 44.
• a positive connection 46 of the anchor plate 26 with the anchor bolt 28 or the hydraulic switching element 28 results in a positive connection 46 of the anchor plate 26 with the anchor bolt 28 or the hydraulic switching element 28.
• a positive connection 46 is produced by the formation of the anchor plate 26 on the anchor bolt 28 or the hydraulic switching element 28 when forming the anchor plate 26.
• the armature plate 26 of the armature assembly 24 is formed on the periphery 52 of the anchor bolt 28 and the hydraulic switching element 28, that between the end face 50 of the armature disk 26 and the end face of the anchor bolt 28 and the hydraulic switching element 28, a supernatant 48 results the residual air gap between the end face 50 of the armature disk 26 and the lower end face of the magnet coil 22 enclosed by the magnetic core 16 is defined.
• the anchor plate 26 is formed by means of the MIM method to form a MIM connection 30 on the anchor bolt 28, wherein the Nachbearbeitungsaufwand takes a minimum.
• FIG. 2.2 shows an alternative embodiment variant of the MIM connection of an armature assembly 24.
• a circumferential groove 54 runs on the circumference 52 of the anchor bolt 28 or of the hydraulic shift element 28.
• a projection 56 is formed during the formation of the anchor plate 26, a projection 56.
• a projection 48 which in the installed state of the armature assembly 24 forms the residual air gap between the end face 50 of FIG Anchor plate 26 and the end face of the magnetic cup 16 enclosed magnetic coil 22 defined.
• FIG. 2.3 shows a further embodiment variant of an armature assembly having an MIM connection.
• a collar 58 is embodied on the circumference 52 of the anchor bolt 28 or of the hydraulic shift element 28.
• the raised collar 58 protruding beyond the circumference 52 of the anchor bolt 28 or the hydraulic shift element 28 forms a correspondingly configured recess on the inside of the anchor plate 26 when the anchor plate 26 is formed.
• FIG. 2.4 shows a variant embodiment of the armature assembly proposed according to the invention, in which at least one undercut 60 is made on the circumference 52 of the armature bolt 28 or of the hydraulic shifting element 28.
• the undercut 60 on the periphery 52 of the anchor bolt 28 and the hydraulic switching element 28 is in the molding of the anchor plate 26 by means of the MIM method of the material from which the anchor plate 26 is made, surrounded.
• a form-fitting connection 46 is formed between the anchor plate 26 and the anchor bolt 28 or the hydraulic shift element 28, which also withstands high acceleration forces.
• the embodiment variants of the armature assembly 24 shown in FIGS. 2.1 to 2.4 are all characterized by an MIM connection 30 between the armature plate 26 and the armature bolt 28 or the hydraulic shifting element 28.
• the outer contouring 44 of the circumference 52 of the anchor bolt 28 or of the hydraulic shift element 28 can be easily manufactured in the output part of the low demands on the tolerances.
• the formation of the residual air gap is adjusted by appropriate dimensioning of the supernatant 48 between the end face 50 of the anchor plate 26 and the end face of the anchor bolt 28 and the hydraulic switching element 28 in the MIM tool and the MIM process, ie the injection or the introduction of a liquid metallic Material, produced during the manufacture of the MIM connection 30 during the molding of the anchor plate 26.
• the armature plate 26 to be formed on the anchor bolt 28 or of the hydraulic shift element 28 is optimally selected with regard to the magnetic properties of the material.
• these can be provided with passage openings, through holes or recesses with which, on the one hand, a reduction in the mass of the anchor plate 26 can be achieved. bar and with which on the other hand, a flow of taxed from the control room tax amount can be optimized.
• FIG. 3 shows the armature assembly proposed according to the invention on an outwardly opening valve (A-valve).
• the fuel injector 10 in the injector head 12 comprises, in which the solenoid valve 14 is accommodated.
• the armature assembly 24 as shown in FIG. 3 comprises the armature plate 26, which is positively connected to the armature bolt 28 or the hydraulic shifting element 28 via an MIM connection 30.
• a seat surface is formed, which cooperates with the seat 36 of the injector 12.
• the armature assembly 24 as shown in Figure 3 opens when energized, the magnetic coil 22, which is surrounded by the magnet pot 16, to the outside.
• a circumferential taper 66 is formed on the circumference 52 of the anchor bolt 28 or of the hydraulic shift element 28, in the region of which the relief line 38 opens for pressure relief of a control chamber, not shown in FIG. 3 but formed in the injector body 12.
• the control volume flows via the relief line 38, the cavity formed by the circumferential taper 66 on the circumference of the anchor bolt 28 and the hydraulic switching element 28 and the opened seat 36, respectively low-pressure return 34 from.
• Another return over the guide leakage is located at the lower end of the bore 32 in the injector body 12, in which the anchor bolt 28 and the hydraulic switching element 28 is guided narrow tolerances.
• FIG. 3 also shows that the upper end face of the anchor bolt 28 or of the hydraulic shift element 28 cooperates with a stop 62 which limits the opening stroke of the armature assembly 24.
• the stroke stop 62 is formed on the lower end side of the magnet pot 16.
• FIG. 4 shows a further embodiment variant of the armature assembly proposed according to the invention on a sleeve valve.
• the illustration according to FIG. 4 shows the fuel injector 10, which has a sleeve valve for depressurizing a relief line 38 of a control chamber in the injector body 12.
• the armature assembly 24 includes in this embodiment, a valve sleeve 68 which is joined to the anchor plate 26 via a MIM connection 30. Within the valve sleeve 38 is acted upon by the closing spring 20 cylindrical valve body 70th added. About the closing spring 20 of the cylindrically shaped valve body 70 is acted upon.
• the end face 50 of the armature plate 26 is tightened, so that the valve sleeve 68 lifts off from the seat 36 on the upper side of the injector body 12.
• an orifice 74 of the discharge line 38 of the control chamber formed in the injector body 12 is depressurized, since a biting edge 76, which is formed on the lower end face of the valve sleeve 68, is lifted off the plan side of the injector body 12.
• the discharge point 74 of the discharge channel 38 may, for example, open into a dome-shaped elevation 72 on the plan side of the injector body 12 of the fuel injector 10 according to the embodiment in FIG.

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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)
• Magnetically Actuated Valves (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=38197996

Family Applications (1)

Country Status (6)

Families Citing this family (8)

Family Cites Families (14)

• 2006
  • 2006-05-04 DE DE102006020689A patent/DE102006020689A1/de not_active Withdrawn
• 2007
  • 2007-03-09 AT AT07726734T patent/ATE445097T1/de active
  • 2007-03-09 JP JP2009508270A patent/JP5748405B2/ja not_active Expired - Fee Related
  • 2007-03-09 EP EP07726734A patent/EP2016277B1/fr not_active Not-in-force
  • 2007-03-09 CN CN2007800162220A patent/CN101438050B/zh not_active Expired - Fee Related
  • 2007-03-09 DE DE502007001689T patent/DE502007001689D1/de active Active
  • 2007-03-09 WO PCT/EP2007/052211 patent/WO2007128605A1/fr not_active Ceased

Non-Patent Citations (1)

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