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
• • 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
  • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B75/00—Other engines
  • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
  • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
  • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

• the invention relates to a Kraf fuel injection valve according to the preamble of claim 1.
• a generic fuel injector is already known.
• a part called a nozzle and a separate guide ring are joined together.
• the guide ring with valve seat and with a hollow cylindrical guide track guides the valve closing body during its axial movement.
• the nozzle is provided with an outlet opening for the fuel to be injected and receives the guide ring in a press fit.
• Fuel injection valves are also known in which the nozzle and the valve seat are formed into a one-piece valve seat body - without a hollow cylindrical guideway.
• the manufacturing effort for the guide ring with valve seat is high due to the high accuracy requirements for the concentricity of the hollow cylindrical guide track to the valve seat.
• the nozzle must be machined very precisely in the area where the guide ring is received. work. This increases the cost of the individual parts and the assembly effort when assembling them. Slightly exceeding the dimensional tolerances of these individual parts can lead to a deformation of the valve seat when the fuel injector is installed. Quality defects of this type result in higher kinetic friction between the valve closing member, the guideways and the valve seat, with far-reaching consequences.
• the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that the guide ring and the nozzle with the valve seat and the at least one outlet opening can be produced and assembled in a simple manner and separately, so that the hollow cylindrical guideway of the Guide ring concentrically comprehensively guides the valve closing body with a particularly narrow clearance so that its position is precisely determined, in particular when the valve closing body opens and the fuel flows around it.
• the guide ring is held on the nozzle axially spaced from the valve seat and the fuel outlet opening by means of a welded connection.
• the guideway of the guide ring and the valve seat are aligned with high precision.
• This exact position is particularly easy to adjust due to the large radial play with which the outer circumference of the guide ring sits in the central longitudinal bore of the nozzle before the ideal position is secured by welding.
• the guideway is adjusted individually to the valve seat.
• the friction between the valve seat and the valve closing body is reduced because eccentricities of the valve closing body to the valve seat are reduced by the narrow guidance. This results in a more precise response of the fuel injector, more precise metering of the fuel and an improved fuel spray pattern. Due to the radial distance from the central longitudinal bore, the guide ring is hardly deformable due to temperature fluctuations.
• the guide ring consists of sheet metal and that the sheet is a spring steel sheet which is perforated many times. It is also advantageous that the fuel swirl openings are designed as swirl grooves penetrating the guide track of the guide ring and inclined to the axis of the longitudinal bore, or that the fuel swirl openings are designed as swirl holes penetrating the guide ring. A further advantage arises from the fact that the fuel swirl openings are supplemented by flow surfaces in the form of swirl flaps formed in the region of the guideway and bends. An additional advantage is obtained if the guide ring consists of spiral, ring-shaped wire, sponge-like, large-pored material or if the guide ring is covered with bristles, the free ends of which form the hollow cylindrical guide track.
• FIG. 1 shows the sectional view of the valve seat area of a fuel injection valve
• FIG. 2 shows the cross section of a valve seat body with a welded-in guide ring
• FIG. 3 shows a plan view of a valve seat body
• FIG. 4 shows the cross section of a valve seat body with sheet metal guide ring
• FIG. 5 shows the cross section ⁇ Nes valve seat body with spiral guide ring.
• the fuel injection valve 1 shown in FIG. 1 for a fuel injection system of compression-ignition, spark-ignition internal combustion engines has a valve housing 3 with a central through opening 4, in which a nozzle 5 is fastened by means of a welded connection 6.
• a guide ring 7 with a central, hollow cylindrical guide track 14 is held in the nozzle 5 in a central longitudinal bore 13 by means of a further weld connection 2.
• the diameter of the longitudinal bore 13 is larger than the outer diameter of the guide ring 7, so that it is joined before welding radial play in the longitudinal bore 13 sits. This play is dimensioned such that the welded joint 2 can, after adjusting the guide ring 7, fill the space between its outer peripheral surfaces and the wall of the longitudinal bore 13.
• the nozzle 5 Downstream of the guide ring 7, the nozzle 5 also has a valve seat 8 and subsequently at least one outlet opening 9 for fuel injection into an intake manifold of an internal combustion engine.
• a tubular valve closing member 10 with radial openings 11 projects through the passage opening 4.
• the valve closing member 10 On the side facing the valve seat 8, the valve closing member 10 carries a valve closing body 12, for example in the form of a hardened ball.
• the valve closing member 10 On the side facing away from the valve seat 8, the valve closing member 10 carries an armature 15 made of soft magnetic material.
• the valve closing body 12 projects into the guide ring 7, which engages around it with little play with its hollow cylindrical guide track 14.
• the valve In the closed state of the fuel injection valve 1, the closing body 12 lies sealingly on the valve seat 8.
• the fuel can flow via fuel swirl openings formed on the guide ring 7, for example in the form of swirl grooves 16, from upstream of the guide ring 7 to the valve seat 8 downstream.
• the swirl grooves 16 can extend obliquely to the axis of the valve closing member 10 in the guideway 14.
• a compression spring 17 acts on the valve closing member 10 in the direction of flow.
• a magnet coil 18 is arranged adjacent to the armature 15 in such a way that, as soon as it is excited, the armature 15 lifts against the force of the compression spring 17.
• an electrical circuit (not shown) of the magnet coil 18 is closed. The magnetic forces then effective attract armature 15.
• the valve closing body 12 of the valve closing member 10 is moved away from the valve seat 8 against the pressurizing compression spring 17, so that the fuel passes through the valve closing member 10 and its radial openings 11 via the swirl grooves 16 to the valve seat 8 and downstream to the at least one outlet opening 9 and can be hosed down.
• the nozzle 5 shows the nozzle 5 with the guide ring 7 as an assembly.
• the weld connection 2 which can be designed as a seam or spot weld between the nozzle 5 and the guide ring 7, and the swirl grooves 16 in the hollow cylindrical guide track 14, which run inclined to the axis of the nozzle 5, are clearly shown here.
• the valve seat 8 and the outlet opening 9 can be seen.
• the guide ring 7 is located in the longitudinal bore 13 axially spaced from the valve seat 8.
• the guide ring 7, as also according to the prior art can be machined with great accuracy inside, ie in the region of the guide track 14.
• the outer circumference of the guide ring 7 can be machined with little accuracy because it sits with play in the longitudinal bore 13 before the weld connection 2 is established.
• the valve seat 8 must be concentric with the guideway 14 so that the valve closing body 12 can lift off or seal quickly from the valve seat 8 when opening and closing and so that the friction path between valve closing body 12 and valve seat 8 is as short as possible.
• the guide ring 7 shown here is a stamped or embossed, internally ground steel ring with a rectangular cross section in radial section.
• An outer lateral surface 20 of the nozzle 5 may be slightly eccentric to the guide cylinder 7. This has no adverse effect due to the length of the valve closing member 10 and the spherical shape of the valve closing body 12.
• the valve closing member 10 may be tilted relative to the valve seat, but not axially offset.
• the swirl grooves 16 not only allow a fuel flow past the valve closing body 10, but they also cause the injected fuel to swirl and improve the fuel spray pattern.
• the guide ring 7 can be produced in sheet metal stamping in a particularly cost-effective manner.
• FIG. 3 shows a further exemplary embodiment of the invention with a nozzle 35 which carries a guide ring 37 made of stamped sheet steel in a longitudinal bore 43 with an axial distance from the valve seat 38 by means of a welded connection 32. Viewed on the left in radial section, this has an elongated S-shaped or rune-like profile. The region of the larger diameter, that is to say the upper part of the guide ring 37, is seated at a radial distance in the longitudinal bore 43, held by the welded connection 32.
• the fuel swirl openings 37 in the lower part of the guide ring 37 are flow-guiding, swirling swirl flaps 46 made of one hollow cylindrical guide track 44 of the guide ring 37 is formed.
• a nozzle 55 carries, by means of a welded connection 52, a guide ring 57 axially spaced apart from the valve seat 58 and the outlet opening 59.
• swirl bores 66 are formed in the guide ring 57 obliquely to the axis of the valve seat body 55.
• the guide ring 57 can consist of both solid steel and sheet metal.
• a nozzle 75 carries a guide ring 77 by means of a welded connection 72 in the form of several weld spots. This is made, for example, of spirally wound wire. The spaces between the wire turns serve as a fuel swirl opening.
• a hollow cylindrical guide track 84 is described by the winding of the guide ring 77 projecting like a rib and marked by a dash-dot line. Due to an elongated design of the area of the winding pointing inside the guide ring 77, the guide track 84 assumes a flat, cylindrical shape, so that, as in the other exemplary embodiments, the valve closing body 12 is tightly enclosed over its entire stroke.
• the guide ring 77 is seated in the longitudinal bore 83 at an axial distance from the valve seat 78.
• An exemplary embodiment of the invention relates to a valve seat body which, via a welded connection, carries a guide ring which is covered with bristles pointing inwards.
• the guide ring can also consist of porous, sponge-like or lattice or sieve-like material.
• the assembly in all three exemplary embodiments takes place in the following, basically the same way: an adjusting ball, the diameter of which is slightly larger than that of the valve closing body 12, is pushed through the guide ring and pushed onto the valve seat presses. In this position, the guide ring in the longitudinal bore is welded to the nozzle under slight axial, position-securing pressure. A high-precision concentricity t of the respective guideway to the corresponding valve seat is thus established and secured.

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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)
• Fuel-Injection Apparatus (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6395063

Family Applications (1)

Country Status (9)

Cited By (2)

Families Citing this family (5)

Citations (5)

• 1989
  • 1989-12-08 DE DE3940585A patent/DE3940585A1/de not_active Withdrawn
• 1990
  • 1990-10-25 KR KR1019920701334A patent/KR0172132B1/ko not_active IP Right Cessation
  • 1990-10-25 EP EP90915088A patent/EP0504147B1/de not_active Expired - Lifetime
  • 1990-10-25 DE DE59007083T patent/DE59007083D1/de not_active Expired - Fee Related
  • 1990-10-25 HU HU9201893A patent/HUT65264A/hu unknown
  • 1990-10-25 JP JP2514116A patent/JP2839708B2/ja not_active Expired - Fee Related
  • 1990-10-25 WO PCT/DE1990/000814 patent/WO1991009222A1/de active IP Right Grant
  • 1990-10-25 ES ES90915088T patent/ES2060200T3/es not_active Expired - Lifetime
  • 1990-12-07 CZ CS906101A patent/CZ279377B6/cs not_active IP Right Cessation
• 1992
  • 1992-06-05 RU SU925052598A patent/RU2059867C1/ru active

Patent Citations (5)

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