EP0750110A1 - Dispositif de redressage d'écoulement pour un injecteur de carburant - Google Patents

Dispositif de redressage d'écoulement pour un injecteur de carburant Download PDF

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Publication number
EP0750110A1
EP0750110A1 EP96109658A EP96109658A EP0750110A1 EP 0750110 A1 EP0750110 A1 EP 0750110A1 EP 96109658 A EP96109658 A EP 96109658A EP 96109658 A EP96109658 A EP 96109658A EP 0750110 A1 EP0750110 A1 EP 0750110A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection valve
fuel injection
insert means
flow
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.)
Withdrawn
Application number
EP96109658A
Other languages
German (de)
English (en)
Inventor
Jeff B. Pace
Vernon R. Warner
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.)
Siemens Automotive Corp
Original Assignee
Siemens Automotive 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 Siemens Automotive Corp filed Critical Siemens Automotive Corp
Publication of EP0750110A1 publication Critical patent/EP0750110A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates

Definitions

  • This invention relates generally to fuel injectors of the type that are used to inject liquid fuel into the induction system of an internal combustion engine, and particularly to a flow straightener for straightening the flow of fuel as it leaves the injector.
  • valves such as certain fuel injectors
  • the movement of certain electrically-operated valves comprises a needle that is reciprocated axially within the interior of the valve's body in response to electrical energization and de-energization of an electro-mechanical actuator to thereby selectively open and close a flow path through the valve.
  • the fuel injector meters fuel and sprays and atomizes fuel.
  • the valve is in communication with an engine intake tube.
  • the valve has a movable valve element associated with a fixed valve seat body, so fuel under pressure flows out of the injector nozzle.
  • pressure surges, disturbed flow and flow obstructions can occur.
  • a flow straightener in the form of a porous element is placed in the passageway between the fuel injector valve seat and the usual orifice disk, or fuel metering device.
  • the insert element decouples the turbulence above the orifice disk from the metering orifice. This provides the advantage of allowing for improved direction and targeting of the fuel spray from the metering orifice.
  • FIG. 1 there is illustrated in cross section, a typical fuel injector 10 having a tubular housing 12.
  • the inside of the tubular housing 12 contains an armature 14 and a plurality of different diameters to form typical various shoulders for a variety of different functions.
  • sealing means 18 and 20 Positioned along the outside of the housing 12 are sealing means 18 and 20 to seal the injector 10 in a bore of an engine or manifold where it is located.
  • the housing 12 has an open end 22, and an outlet end 24.
  • the outlet end 24 is counterbored to form a shoulder 26 for locating a seat assembly 28, which may be comprised of a valve seat 30.
  • Figs. 2 and 3 illustrate in cross section, a representative lower portion of the fuel injector 10 of Fig. 1, such as a DEKATM injector of the type manufactured by Siemens Automotive Corporation.
  • the outlet end 24 encloses the seat assembly 28, including the valve seat 30 which contains an orifice or metering device 34.
  • the valve seat 30 can operate as a stop means for the armature 14 located within the housing 12 and movable against the valve seat 30 in response to a magnetic force, typically generated by a coil and a return spring.
  • a spherical radius at one end of the needle valve 38 mates with the valve seat 30 to close the injector 10 when the armature moves in a first, or closing, direction. If the needle valve 38 is not biased against the valve seat 30, as when the armature 14 is moving in a second, or opening, direction, turbulence can occur. Fuel is allowed to seep through crevice volumes created between the needle valve 38 and the valve seat 30. The motion of the needle valve 38, therefore, must be accompanied by the flow of fuel in and out of these crevice volumes while controlling fuel seepage past the valve seat 30 into the engine by means of the O-ring seal 32.
  • the fuel metering device 34 operates as the final metering or targeting device for controlling the fuel flow.
  • the present invention therefore, introduces an insert means or flow straightener means 40 which decouples the seat assembly, and associated turbulence, from the metering device 34.
  • the flow straightner 40 straightens fuel flow, thereby providing an improved flow pattern.
  • the flow straightener 40 is located in the passageway between the fuel injector valve seat 30 and the metering orifice 34. With the flow straightner 40, when the needle 38 is opened, turbulence is essentially eliminated, allowing the metering orifice 34 to provide a more targeted fuel spray.
  • the flow straightner 40 may be of a variety of constructions.
  • the flow straightner 40 is preferably a porous material such as sintered metal, ceramic, porous plastic, screen or other mesh; and may be any suitable shape including, but not limited to, approximately flat, tubular, square, round or oval.
  • Fig. 2 illustrates one embodiment for controlled disbursement of fuel, wherein the flow straightner 40 is essentially a flat section of material, such as a screen.
  • Fig. 3 illustrates an embodiment for controlled disbursement of fuel, wherein the flow straightner 40 comprises an approximately flat section 40a and a tubular plug section 42, such as a ceramic or plastic material.
  • the embodiment of Fig. 3 has the desirable advantage of decreasing the volume between the needle 38 and the orifice disk 34, an area without metered fuel.
  • the fuel flow and fuel spray performance can be maximized by controlling the porosity and size of the flow straightner 40. For example, a less porous material will result in less of a fuel flow drop; whereas a more porous material will introduce more obstructions, resulting in more flow straightening. Additionally, as the flow straightner 40 element comprises more length, less porosity is required to achieve flow straightness, since the additional length positively affects flow straightness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP96109658A 1995-06-21 1996-06-17 Dispositif de redressage d'écoulement pour un injecteur de carburant Withdrawn EP0750110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49315195A 1995-06-21 1995-06-21
US493151 1995-06-21

Publications (1)

Publication Number Publication Date
EP0750110A1 true EP0750110A1 (fr) 1996-12-27

Family

ID=23959120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96109658A Withdrawn EP0750110A1 (fr) 1995-06-21 1996-06-17 Dispositif de redressage d'écoulement pour un injecteur de carburant

Country Status (2)

Country Link
EP (1) EP0750110A1 (fr)
JP (1) JPH0914080A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004828A1 (fr) 1996-07-26 1998-02-05 Siemens Automotive Corporation Procede et appareil pour une atomisation regulee dans un injecteur de carburant destine a un moteur a combustion interne
WO2000052328A1 (fr) * 1999-03-01 2000-09-08 Siemens Automotive Corporation Injecteur de carburant a generateur de turbulence pour orifice de carburant

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1153605A (en) * 1965-11-22 1969-05-29 John Adwin Ii Cupler Improvements relating to Composite Fluid Nozzles
US4421278A (en) * 1980-06-25 1983-12-20 Robert Bosch Gmbh Injection valve
JPS60111057A (ja) * 1983-11-21 1985-06-17 Hitachi Ltd 電磁式燃料噴射弁
JPS61104156A (ja) * 1984-10-26 1986-05-22 Nippon Denso Co Ltd 電磁式燃料噴射弁
JPS6213773A (ja) * 1985-07-12 1987-01-22 Tech Res Assoc Highly Reliab Marine Propul Plant 蒸気式噴射弁
US4981266A (en) * 1981-05-30 1991-01-01 Robert Bosch Gmbh Injection valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1153605A (en) * 1965-11-22 1969-05-29 John Adwin Ii Cupler Improvements relating to Composite Fluid Nozzles
US4421278A (en) * 1980-06-25 1983-12-20 Robert Bosch Gmbh Injection valve
US4981266A (en) * 1981-05-30 1991-01-01 Robert Bosch Gmbh Injection valve
JPS60111057A (ja) * 1983-11-21 1985-06-17 Hitachi Ltd 電磁式燃料噴射弁
JPS61104156A (ja) * 1984-10-26 1986-05-22 Nippon Denso Co Ltd 電磁式燃料噴射弁
JPS6213773A (ja) * 1985-07-12 1987-01-22 Tech Res Assoc Highly Reliab Marine Propul Plant 蒸気式噴射弁

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 286 (M - 521) 27 September 1986 (1986-09-27) *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 188 (M - 599) 17 June 1987 (1987-06-17) *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 264 (M - 423) 22 October 1985 (1985-10-22) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004828A1 (fr) 1996-07-26 1998-02-05 Siemens Automotive Corporation Procede et appareil pour une atomisation regulee dans un injecteur de carburant destine a un moteur a combustion interne
WO2000052328A1 (fr) * 1999-03-01 2000-09-08 Siemens Automotive Corporation Injecteur de carburant a generateur de turbulence pour orifice de carburant
US6330981B1 (en) 1999-03-01 2001-12-18 Siemens Automotive Corporation Fuel injector with turbulence generator for fuel orifice

Also Published As

Publication number Publication date
JPH0914080A (ja) 1997-01-14

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