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
  • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
  • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
  • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
  • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
  • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
  • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
  • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • 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
  • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
  • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
  • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
  • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
  • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
• • 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
  • F02M61/166—Selection of particular materials
• • 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
  • 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
  • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
  • F02M2200/505—Adjusting spring tension by sliding spring seats
• • 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
  • F02M2200/9038—Coatings

Definitions

• the invention is based on an electromagnetically actuated valve according to the preamble of the main claim.
• Various electromagnetically actuated valves in particular fuel injection valves, are already known, in which components subject to wear are provided with wear-resistant layers.
• DE-OS 38 10 826 describes a fuel injection valve in which at least one stop surface is designed in the form of a spherical cap in order to achieve an extremely precise air gap, a round-body insert made of non-magnetic, high-strength material being formed in the center of the stop surface.
• a fuel injection valve is also known from EP-OS 0 536 773, in which a hard metal layer is applied to the armature on its cylindrical circumferential surface and annular stop surface by electroplating.
• This layer of chrome or nickel has a thickness of 15 to 25 ⁇ m, for example.
• a slightly wedge-shaped layer thickness distribution occurs, a minimally thicker layer being achieved on the outer edges. Due to the galvanically deposited layers, the layer thickness distribution is physically predetermined and can hardly be influenced. After a certain operating time, the abutment surface widens undesirably due to wear, which results in changes in the armature's pull-in and fall-out times.
• the electromagnetically actuated valve according to the invention with the characterizing features of the main claim has the advantage that at least one of the abutting components is designed in such a way that after the creation of a wear-resistant surface it is ensured that the abutment surface even after a long period of operation is not undesirably increased by wear, so that the pulling and falling times of the movable component remain almost constant. That will achieved by at least one of the abutting components already having a stepped surface prior to the generation of the wear resistance. This stepped surface can be precisely adapted to different conditions to achieve a magnetic and hydraulic optimum.
• the stepped surface shape of the at least one component, eg. B. the armature, also allows that non-galvanic and magnetic wear-resistant layers can be applied without the requirement for a very small stop area remains unfulfilled.
• a particular advantage is that the surface of the stop area of at least one of the abutting components is made wear-resistant by using a method known per se, e.g. B. a nitriding process such as plasma nitriding or gas nitriding or the like is hardened.
• a nitriding process such as plasma nitriding or gas nitriding or the like is hardened.
• a small, ring-shaped and precisely defined stop area is provided if a step is advantageously introduced on at least one component surface serving as a stop.
• the ring-shaped stop region with a defined stop surface width which corresponds to the contact width, remains constant over the entire service life, since wear of the stop surface during continuous operation by the step does not lead to an increase in the contact width.
• the impact security is fully guaranteed. Hydraulic gluing is impossible due to the small stop surface. Since a constant contact width is guaranteed over the entire service life, the hydraulic conditions in the gap between the striking parts, e.g. B. between core and anchor, constant.
• FIG. 1 shows a fuel injection valve
• FIG. 2 shows an enlarged stop of the injection valve in the region of the core and armature
• FIG. 3 shows a first exemplary embodiment of an armature graded according to the invention
• FIG. 4 shows a second exemplary embodiment of a stepped armature
• FIG. 5 shows a third embodiment Example of a stepped anchor. Description of the embodiments
• the electromagnetically actuated valve shown in FIG. 1, for example, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a core 2, which is surrounded by a magnetic coil 1 and serves as a fuel inlet connection and is, for example, tubular here and has a constant outer diameter over its entire length.
• a tubular metal intermediate part 12 is tightly connected concentrically to a longitudinal valve axis 10, for example by welding, and thereby partially axially surrounds the core end 9.
• the stepped coil body 3 partially overlaps the core 2 and, with a step 15 of larger diameter, the intermediate part 12 at least partially axially.
• a tubular valve seat carrier 16 extends downstream of the bobbin 3 and the intermediate part 12 and is, for example, firmly connected to the intermediate part 12.
• a longitudinal bore 17 runs in the valve seat support 16 and is formed concentrically to the valve longitudinal axis 10.
• a tubular valve needle 19 Arranged in the longitudinal bore 17 is, for example, a tubular valve needle 19 which, at its downstream end 20, has a spherical valve closing body 21, on the circumference of which, for example, five flats 22 are provided for the fuel to flow past, for example is connected by welding.
• the injection valve is actuated electromagnetically in a known manner.
• the electromagnetic circuit with the magnet coil 1, the core 2 and an armature 27 is used for the axial movement of the valve needle 19 and thus for opening against the spring force of a return spring 25 or closing the injection valve.
• the armature 27 is with the valve closing body 21 facing away from the end of the valve needle 19 by a first weld 28 and aligned to the core 2.
• a cylindrical valve seat body 29 which has a fixed valve seat, is tightly mounted in the longitudinal bore 17 by welding.
• a guide opening 32 of the valve seat body 29 is used to guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 27 along the valve longitudinal axis 10.
• the spherical valve closing body 21 interacts with the valve seat of the valve seat body 29 which tapers in the direction of a truncated cone in the direction of flow.
• the valve seat body 29 On its end facing away from the valve closing body 21, the valve seat body 29 is connected concentrically and firmly to a spray-perforated disk 34, for example in the form of a pot. At least one runs in the base part of the spray perforated disk 34, for example four spray openings 39 formed by eroding or stamping.
• the insertion depth of the valve seat body 29 with the cup-shaped spray perforated disk 34 determines the presetting of the stroke of the valve needle 19.
• Position of the valve needle 19 when the magnet coil 1 is not excited is determined by the contact of the valve closing body 21 on the valve seat of the valve seat body 29, while the other end position of the valve needle 19 when the magnet coil 1 is excited results from the contact of the armature 27 at the core end 9 , that is to say exactly in the area which is formed according to the invention and is characterized in more detail by a circle.
• An adjusting sleeve 48 which is pushed into a flow bore 46 of the core 2 concentrically to the longitudinal axis 10 of the valve and which is formed, for example, from rolled spring steel sheet, serves to adjust the spring preload of the return spring 25 resting on the adjusting sleeve 48, which in turn is with its opposite side supported on the valve needle 19.
• the injection valve is largely enclosed in a plastic encapsulation 50, which extends from the core 2 in the axial direction via the solenoid coil 1 to the valve seat carrier 16. About this plastic encapsulation
• molded-on electrical connector 52 includes, for example, a molded-on electrical connector 52.
• a fuel filter 61 projects into the flow bore 46 of the core 2 at its inlet end 55 and provides for the filtering out of those fuel components which, because of their size, could cause blockages or damage in the injection valve.
• FIG. 2 shows the area of the one end position of the valve needle 19 marked with a circle in FIG. 1, in which the armature 27 strikes the core end 9 of the core 2, on a different scale.
• metallic layers 65 to the core end 9 of the core 2 and to the armature 27, for example chrome or nickel layers, by means of electroplating.
• the layers 65 are applied both to an end face 67 running perpendicular to the longitudinal valve axis 10 and at least partially to a peripheral face 66 of the armature 27.
• These layers 65 are particularly wear-resistant and, with their small surface area, reduce hydraulic sticking of the abutting surfaces, but without being able to reliably prevent it.
• Layer thickness of these layers 65 is generally between 10 and 25 microns.
• part of the anchor 27 according to the invention is shown in the area of its upper end face 67 in FIG. 3, which already before the coating or the production. has a step section 70 due to the wear resistance of the surface.
• the step of the anchor 27 before the coating or the generation of the wear resistance can be predetermined and manufactured in accordance with the required values so that a magnetic and hydraulic optimum is achieved in each case.
• the step section 70 of the end face 67 also allows non-galvanic, wear-resistant layers, which may also be magnetic, to be applied without the requirement for a very small stop area remaining unfulfilled.
• the end face 67 at least in the area of its stop section 69, can be made wear-resistant by treating the surface by means of a hardening process.
• a hardening process e.g. the known nitriding processes such as plasma nitriding or gas nitriding are suitable.
• the step section 70 has the consequence that the precisely defined annular stop section 69 is formed on the end face 67.
• the stop section 69 of the upper end face 67 of the armature 27, which serves as a stop now clearly protrudes over a step bottom 71.
• the protruding, ring-shaped stop section 69 with a width b between 20 and 500 ⁇ m thus serves as a stop, which in the embodiment according to FIG. 3 lies between the peripheral surface 66 and the step section 70, which is formed inwardly offset.
• This stop section 69 maintains a constant width b over the entire operating time. The abovementioned wear therefore no longer has any influence on the stop surface width or contact width.
• Hydraulic gluing is excluded due to the small stop surface. Since a constant contact width is guaranteed over the entire service life, the hydraulic conditions in the gap between the striking parts, here between core 2 and armature 27, remain a great advantage. Compared to the flat stop surface of the stop section 69, the advantages of the invention are obtained at an axial distance of 5 ⁇ m from the step floor 71.
• the hydraulic and magnetic optimum is achieved by a suitable choice of the width b and the depth of the step base 71, which is between 5 and 15 ⁇ m, for example.
• both the armature 27 and the core 2 can be coated with a corresponding step before coating or generating a wear-resistant surface.
• section 70 are provided, so that very precisely defined annular stop sections 69 are formed on both abutting sides, as shown in FIG.
• this step section 70 it is possible to provide this step section 70 only on the core 2, while the armature 27 is given a flat end face, for example.
• FIGS. 4 and 5 show further exemplary embodiments of anchors 27 designed according to the invention. It is conceivable that the stop section 69 is formed on the end face 67 towards the longitudinal axis 10 of the valve, while the step section 70 is offset axially outward toward the peripheral face 66 lies ( Figure 4).
• FIG. 5 shows an exemplary embodiment of the armature 27, in which the stop section 69 is surrounded on the inside and outside, that is to say to the peripheral surface 66 and to the valve longitudinal axis 10, by step sections 70.
• step section 70 is already present on at least one end face 67 of the armature 27 and / or core 2, as already mentioned, the application of
• Processes deviating from chromium or nickel layers are used to increase the quality by improving the wear resistance of the end face 67.
• hardening processes e.g. Plasma nitriding, gas nitriding or carburizing, by means of which the surface structure on the anchor 27 and / or core 2 is changed, can even be completely dispensed with methods for direct coating.

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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)
• Electromagnetism (AREA)
• Manufacturing & Machinery (AREA)
• Fuel-Injection Apparatus (AREA)
• Magnetically Actuated Valves (AREA)

Priority Applications (5)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25931898

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (19)

Citations (3)

Family Cites Families (5)

• 1994
  • 1994-11-24 CZ CZ951980A patent/CZ284430B6/cs not_active IP Right Cessation
  • 1994-11-24 CN CN 94190985 patent/CN1055524C/zh not_active Expired - Lifetime
  • 1994-11-24 BR BR9406081A patent/BR9406081A/pt not_active IP Right Cessation
  • 1994-11-24 JP JP7515871A patent/JPH08506876A/ja active Pending
  • 1994-11-24 ES ES95900659T patent/ES2113722T3/es not_active Expired - Lifetime
  • 1994-11-24 EP EP95900659A patent/EP0683861B1/de not_active Expired - Lifetime
  • 1994-11-24 RU RU95120217A patent/RU2131992C1/ru not_active IP Right Cessation
  • 1994-11-24 WO PCT/DE1994/001389 patent/WO1995016125A1/de active IP Right Grant
• 2007
  • 2007-03-14 JP JP2007065577A patent/JP4755619B2/ja not_active Expired - Lifetime

Patent Citations (3)

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