EP0404342A1 - Einspritzventil für Kraftstoffeinspritzsystem - Google Patents

Einspritzventil für Kraftstoffeinspritzsystem Download PDF

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Publication number
EP0404342A1
EP0404342A1 EP90305384A EP90305384A EP0404342A1 EP 0404342 A1 EP0404342 A1 EP 0404342A1 EP 90305384 A EP90305384 A EP 90305384A EP 90305384 A EP90305384 A EP 90305384A EP 0404342 A1 EP0404342 A1 EP 0404342A1
Authority
EP
European Patent Office
Prior art keywords
valve
orifices
injector
seats
passages
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.)
Granted
Application number
EP90305384A
Other languages
English (en)
French (fr)
Other versions
EP0404342B1 (de
Inventor
Ernest Richmond Stettner
Roland Stuart Taylor
Donald Dibble Stoltman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
General Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Motors Corp filed Critical General Motors Corp
Publication of EP0404342A1 publication Critical patent/EP0404342A1/de
Application granted granted Critical
Publication of EP0404342B1 publication Critical patent/EP0404342B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/50—Arrangement of fuel distributors, e.g. with means for supplying equal portion of metered fuel to injectors
    • 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
    • F02M51/02—Fuel-injection apparatus characterised by being operated electrically specially for low-pressure fuel-injection

Definitions

  • This invention relates to a fuel-injection system for a multi-cylinder internal combustion engine in which a plurality of injection nozzles discharge fuel adjacent the engine inlet ports and a single injector meters the fuel to all of the injection nozzles as specified in the preamble of claim 1, for example as disclosed in EP-A-0 249 313.
  • An injector according to the present invention is characterised by the features specified in the characterising portion of claim 1.
  • an injector 10 has a body 12 that receives fuel through a plurality of radial inlet passages 14 surrounded by a filter 16.
  • a distributor 18 threaded into the lower end of body 12 delivers fuel through six outlet passages 20, each of which directs fuel to an associated injection nozzle.
  • valve 22 controls the delivery of fuel through passages 20. As shown in Figure 2, valve 22 is biased by a spring 24 to engage a planar surface 26 formed by raised valve seat lands 28, each one surrounding a respective one of the passages 20, and thereby to interrupt fuel delivery through passages 20.
  • Injector 10 includes a solenoid having a coil 30, a centre pole 32 surrounding spring 24, a spacer ring 34 surrounding valve 22 and sandwiched with a shim 36 between body 12 and distributor 18, and an armature formed by valve 22.
  • Valve 22 is tapered from its thickest portion on the left as viewed in Figures 2-3 to its thinnest portion on the right.
  • coil 30 When coil 30 is energized as shown in Figure 3 to actuate valve 22, the thickest portion of valve 22 engages shim 36 and causes the valve to pivot about its left edge, thereby lifting the valve 22 from lands 28 to allow fuel delivery through passages 20.
  • Each land 28 is separated from the other lands by a recessed space 38 between the lands.
  • the recessed space 38 assures that each land 28 is isolated from the other lands to minimize the effect or interaction of fuel delivery through any one passage 20 on fuel delivery through the other passages.
  • valve 22 pivots as it lifts from lands 28, the clearance between valve 22 and lands 28a and 28b is less than the clearance between valve 22 and lands 28c and 28d which in turn is less than the clearance between valve 22 and lands 28e and 28f. Unless otherwise compensated, the differences in clearance would create undesirable inequalities in fuel delivery through passages 20.
  • passages 20 are clustered beneath the right, free end of armature valve 22, and pins 40 hold valve 22 in alignment with passages 20.
  • Pins 40 are imbedded in distributor 18 and constrain the movement of valve 22 to the pivotal motion described above, preventing valve 22 from rotating on distributor 18.
  • an orifice formed at the entrance to each passage 20 is sized to assure equal fuel delivery through passages 20.
  • Orifices 42a and 42b associated with lands 28a and 28b are larger than orifices 42c and 42d associated with lands 28c and 28d, and orifices 42c and 42d in turn are larger than orifices 42e and 42f associated with lands 28e and 28f.
  • the clearance between valve 22 and lands 28a and 28b is about 0.0056 and the diameter of orifices 42a and 42b is about 0.041
  • the clearance between valve 22 and lands 28c and 28d is about 0.0060 and the diameter of orifices 42c and 42d is about 0.0395
  • the clearance between valve 22 and lands 28e and 28f is about 0.0065 and the diameter of orifices 42e and 42f is about 0.038.
  • the dimensional relationships between the respective clearances and the diameters of the orifices in this embodiment are such that the clearance between valve 22 and lands 28a and 28b is 86.15% of the clearance between valve 22 and lands 28e and 28f, and the clearance between valve 22 and lands 28c and 28d is 92.30% of the clearance between valve 22 and lands 28e and 28f; whilst the diameter of the orifices 42a and 42b is 108% of the diameter of orifices 42e and 42f, and the diameter of the orifices 42c and 42d is 104% of the diameter of orifices 42e and 42f.
  • Injector 10 also includes an invention as set forth in European patent application No. filed concurrently herewith.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19900305384 1989-06-21 1990-05-18 Einspritzventil für Kraftstoffeinspritzsystem Expired - Lifetime EP0404342B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36950589A 1989-06-21 1989-06-21
US369505 1989-06-21

Publications (2)

Publication Number Publication Date
EP0404342A1 true EP0404342A1 (de) 1990-12-27
EP0404342B1 EP0404342B1 (de) 1993-01-20

Family

ID=23455765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900305384 Expired - Lifetime EP0404342B1 (de) 1989-06-21 1990-05-18 Einspritzventil für Kraftstoffeinspritzsystem

Country Status (6)

Country Link
EP (1) EP0404342B1 (de)
JP (1) JPH0333471A (de)
BR (1) BR9002929A (de)
CA (1) CA2018608C (de)
DE (1) DE69000794T2 (de)
MX (1) MX172612B (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4572436A (en) * 1984-12-24 1986-02-25 General Motors Corporation Electromagnetic fuel injector with tapered armature/valve
US4787418A (en) * 1987-09-15 1988-11-29 Colt Industries Inc. Valve assembly and fuel metering apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4572436A (en) * 1984-12-24 1986-02-25 General Motors Corporation Electromagnetic fuel injector with tapered armature/valve
US4787418A (en) * 1987-09-15 1988-11-29 Colt Industries Inc. Valve assembly and fuel metering apparatus

Also Published As

Publication number Publication date
DE69000794T2 (de) 1993-05-13
EP0404342B1 (de) 1993-01-20
CA2018608A1 (en) 1990-12-21
DE69000794D1 (de) 1993-03-04
JPH0333471A (ja) 1991-02-13
MX172612B (es) 1994-01-03
CA2018608C (en) 1994-10-18
BR9002929A (pt) 1991-08-20

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