EP3334923A1 - A fuel injector with a new shim - Google Patents

A fuel injector with a new shim

Info

Publication number
EP3334923A1
EP3334923A1 EP16756630.6A EP16756630A EP3334923A1 EP 3334923 A1 EP3334923 A1 EP 3334923A1 EP 16756630 A EP16756630 A EP 16756630A EP 3334923 A1 EP3334923 A1 EP 3334923A1
Authority
EP
European Patent Office
Prior art keywords
shim
magnetic element
fuel injector
casing
armature
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Withdrawn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
EP16756630.6A
Other languages
German (de)
French (fr)
Inventor
Gurkan GUNC
Ali Murat ALEMDAG
Barkin ARAK
Yesim YALNIZCAN AYDIN
Veyzat GAZI
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.)
Robert Bosch GmbH
Original Assignee
Bosch Sanayi ve Ticaret AS
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 Bosch Sanayi ve Ticaret AS filed Critical Bosch Sanayi ve Ticaret AS
Publication of EP3334923A1 publication Critical patent/EP3334923A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • 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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/07—Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts
    • 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
    • F02M2200/9069—Non-magnetic metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1661—Electromagnets or actuators with anti-stick disc

Definitions

  • the present invention relates to fuel injectors used for spraying fuel into the combustion chamber in internal combustion engines.
  • Fuel injectors in general provide spraying fuel with desired intervals into the combustion chamber in internal combustion engines.
  • a magnetic element triggers the movement of an armature element. Accordingly, the fuel injector realizes spraying process by means of the movement of the magnetic element.
  • the magnetic element draws the armature element towards itself.
  • the armature element is pushed with the help of a spring provided in the fuel injector, and it is diverged from the magnetic element.
  • an amount of electrical charge remains thereon. There is a shim positioned between the magnetic element and the armature element due to said electrical charge.
  • Said shim is made of a non-magnetized material.
  • the armature element is drawn thanks to the magnetic field formed.
  • the thickness of the shim becomes very important. If the shim becomes thicker than desired, the power of the magnetic field is not sufficient for drawing the armature element, and thus, the fuel injector does not operate. Since the shim slides and its form changes as a result of the impacts during operation, thickness differences may occur, and malfunction problem may occur.
  • the present invention relates to a fuel injector, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.
  • the main object of the present invention is to provide a fuel injector having an improved shim embodiment.
  • the present invention is a fuel injector in order to be used in internal combustion engines and comprising a magnetic element positioned inside a casing, at least one armature element which displaces as a result of the effect of said magnetic element, and at least one shim provided between the armature element and the magnetic element.
  • the shim comprises at least one fixation section remaining between the magnetic element and the holder wall provided on the side of the casing facing the armature element.
  • the shim is tightened and fixed between the holder wall and the magnetic element.
  • the fixation section extends along the outer periphery of the shim.
  • the shim is fixed along the outer periphery.
  • the shim comprises at least one outer flow gap in order to permit fuel flow through the shim.
  • said outer flow gap is provided at the vicinity of the outer periphery of the shim.
  • At least one inner flow gap is provided in the vicinity of the center of the shim.
  • the shim outer diameter is greater than the holder inner diameter defined at the holder wall of the casing.
  • FIG. 1 a in the subject matter fuel injector, there is at least one magnetic element (20) positioned inside a casing (10), and at least one armature element (30) provided in the vicinity of said magnetic element (20), and at least one shim (40) provided between the armature element (30) and the magnetic element (20).
  • Said casing (10) has a cylindrical body.
  • Said holder wall (1 1 ) extends radially inwardly on the side of the casing (10) facing the armature element (30).
  • the holder inner diameter (d1 ) of the holder wall (1 1 ) is smaller than the outer diameter (d2) of the magnetic element (20).
  • the shim (40) has at least one inner flow gap (41 ) in order to permit fuel passage through the shim (40).
  • Said fixation section (43) can extend along the outer periphery (44) of the shim (40), and pluralities of fixation sections (43) can be provided such that there is a specific distance in between.
  • the shim outer diameter (d3) defined by the outer periphery (44) of the shim (40) is provided to be greater than the holder inner diameter (d1 ) of the holder wall (1 1 ).
  • the fixation section (43) defined in the vicinity of the outer periphery (44) of the shim (40) is tightened between the magnetic element (20) and the holder wall (1 1 ).
  • the shim (40) is fixed.
  • the deformation of the shim (40) during operation due to the impacts of the armature element (30) is prevented.
  • the shim (40) remains in the original thickness, and the distance between the magnetic element (20) and the armature element (30) remains as desired.
  • Fuel passes through the inner flow gap (41 ) and the outer flow gap (42) provided on the shim (40) and fuel displaced as desired during the operation of the fuel injector. Moreover, since the position of the shim (40) is fixed, the inner flow gaps (41 ) and the outer flow gaps (42) are fixed in the predetermined positions. Thus, the flow path of the fuel is not closed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The present invention relates to a fuel injector in order to be used in internal combustion engines and comprising a magnetic element (20) positioned inside a casing (10), at least one armature element (30) which displaces as a result of the effect of said magnetic element (20), and at least one shim (40) provided between the armature element (30) and the magnetic element (20), characterized in that the shim (40) comprises at least one fixation section (43) remaining between the magnetic element (20) and the holder wall (11) provided on the side of the casing (10) facing the armature element (30).

Description

SPECIFICATION
A FUEL INJECTOR WITH A NEW SHIM TECHNICAL FIELD
The present invention relates to fuel injectors used for spraying fuel into the combustion chamber in internal combustion engines. PRIOR ART
Fuel injectors in general provide spraying fuel with desired intervals into the combustion chamber in internal combustion engines. In the magnetic type injectors provided among the fuel injectors, a magnetic element triggers the movement of an armature element. Accordingly, the fuel injector realizes spraying process by means of the movement of the magnetic element. In said embodiment, when current is applied on the magnetic element, the magnetic element draws the armature element towards itself. Afterwards, when the current provided on the magnetic element is eliminated, the armature element is pushed with the help of a spring provided in the fuel injector, and it is diverged from the magnetic element. When the current applied on the magnetic element is removed, an amount of electrical charge remains thereon. There is a shim positioned between the magnetic element and the armature element due to said electrical charge. Said shim is made of a non-magnetized material. Thus, when current is applied only onto the magnetic element, the armature element is drawn thanks to the magnetic field formed. However, in this case, the thickness of the shim becomes very important. If the shim becomes thicker than desired, the power of the magnetic field is not sufficient for drawing the armature element, and thus, the fuel injector does not operate. Since the shim slides and its form changes as a result of the impacts during operation, thickness differences may occur, and malfunction problem may occur.
As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.
BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a fuel injector, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.
The main object of the present invention is to provide a fuel injector having an improved shim embodiment.
In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a fuel injector in order to be used in internal combustion engines and comprising a magnetic element positioned inside a casing, at least one armature element which displaces as a result of the effect of said magnetic element, and at least one shim provided between the armature element and the magnetic element. Accordingly, the shim comprises at least one fixation section remaining between the magnetic element and the holder wall provided on the side of the casing facing the armature element. Thus, the shim is tightened and fixed between the holder wall and the magnetic element.
In a preferred embodiment of the subject matter invention, the fixation section extends along the outer periphery of the shim. Thus, the shim is fixed along the outer periphery. In another preferred embodiment of the subject matter invention, the shim comprises at least one outer flow gap in order to permit fuel flow through the shim.
In another preferred embodiment of the subject matter invention, said outer flow gap is provided at the vicinity of the outer periphery of the shim.
In another preferred embodiment of the subject matter invention, at least one inner flow gap is provided in the vicinity of the center of the shim.
In another preferred embodiment of the subject matter invention, the shim outer diameter is greater than the holder inner diameter defined at the holder wall of the casing.
BRIEF DESCRIPTION OF THE FIGURES
In Figure 1 a, a representative cross sectional view of the subject matter fuel injector is given.
In Figure 1 b, a representative detailed view of the subject matter fuel injector is given. In Figure 2 and 3, the representative alternative views of the shim of the subject matter fuel injector are given.
REFERENCE NUMBERS
10 Casing
1 1 Holder wall
20 Magnetic element
30 Armature element
40 Shim
41 Inner flow gap
42 Outer flow gap
43 Fixation section
44 Outer periphery d1 Holder inner diameter
d2 Outer diameter
d3 Shim outer diameter THE DETAILED DESCRIPTION OF THE INVENTION
In this detailed description, the subject matter fuel injector is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.
As can be seen in Figure 1 a, in the subject matter fuel injector, there is at least one magnetic element (20) positioned inside a casing (10), and at least one armature element (30) provided in the vicinity of said magnetic element (20), and at least one shim (40) provided between the armature element (30) and the magnetic element (20). Said casing (10) has a cylindrical body. There is at least one holder wall (1 1 ) provided on the side of the casing (10) facing the armature element (30). Said holder wall (1 1 ) extends radially inwardly on the side of the casing (10) facing the armature element (30). Accordingly, the holder inner diameter (d1 ) of the holder wall (1 1 ) is smaller than the outer diameter (d2) of the magnetic element (20). Thus, when the magnetic element (20) is placed into the casing (10), it is fixed to the holder wall (1 1 ). By means of this, the magnetic element (20) is prevented from removing from the casing (10). As can be seen in Figure 2 and 3, the shim (40) has at least one inner flow gap (41 ) in order to permit fuel passage through the shim (40). Moreover, there is at least one fixation section (43) defined in the vicinity of the outer periphery (44). Said fixation section (43) can extend along the outer periphery (44) of the shim (40), and pluralities of fixation sections (43) can be provided such that there is a specific distance in between. There is at least one outer flow gap (42) provided in the vicinity of said fixation section (43). Pluralities of outer flow gaps (42) are provided such that there is a specific distance in between. Moreover, the shim outer diameter (d3) defined by the outer periphery (44) of the shim (40) is provided to be greater than the holder inner diameter (d1 ) of the holder wall (1 1 ).
As can be seen in Figure 1 a and 1 b, while the magnetic element (20) is placed into the casing (10), the shim (40) is placed into the casing (10). Thus, the shim (40) leans onto the inner side of the holder wall (1 1 ). Afterwards, the magnetic element (20) is placed into the casing (10). By means of this, the shim (40) remains between the magnetic element (20) and the holder wall (1 1 ). In more details, when the shim (40) is placed into the casing (10), the shim (40) leans onto the holder wall (1 1 ) since the shim outer diameter (d3) is greater than the holder inner diameter (d1 ). Afterwards, when the magnetic element (20) is placed into the casing (10), the fixation section (43) defined in the vicinity of the outer periphery (44) of the shim (40) is tightened between the magnetic element (20) and the holder wall (1 1 ). Thus, the shim (40) is fixed.
In the light of all of these structural details, in the subject matter fuel injector, when electrical current is applied to the magnetic element (20), a magnetic field is formed, and the spraying process is realized by drawing the armature element (30) towards itself as a result of the effect of this magnetic field. When the electrical current applied to the magnetic element (20) is removed, the magnetic field effect is removed and the armature element (30) is released. Since the shim (40) is made of a non-magnetizing material, the armature element (30) is not attracted to the shim (40) and thereby it is not fixed. Since the shim (40) is fixed between the magnetic element (20) and the holder wall (1 1 ) of the casing (10), it is prevented from moving and changing position. Thanks to this, the deformation of the shim (40) during operation due to the impacts of the armature element (30) is prevented. Thus, the shim (40) remains in the original thickness, and the distance between the magnetic element (20) and the armature element (30) remains as desired.
Fuel passes through the inner flow gap (41 ) and the outer flow gap (42) provided on the shim (40) and fuel displaced as desired during the operation of the fuel injector. Moreover, since the position of the shim (40) is fixed, the inner flow gaps (41 ) and the outer flow gaps (42) are fixed in the predetermined positions. Thus, the flow path of the fuel is not closed.
The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

Claims

1 . A fuel injector in order to be used in internal combustion engines and comprising a magnetic element (20) positioned inside a casing (10), at least one armature element (30) which displaces as a result of the effect of said magnetic element (20), and at least one shim (40) provided between the armature element (30) and the magnetic element (20), characterized in that the shim (40) comprises at least one fixation section (43) remaining between the magnetic element (20) and the holder wall (1 1 ) provided on the side of the casing (10) facing the armature element (30).
2. A fuel injector according to Claim 1 , characterized in that the fixation section (43) extends along the outer periphery (44) of the shim (40).
3. A fuel injector according to Claim 1 , characterized in that the shim (40) comprises at least one outer flow gap (42) in order to permit fuel flow through the shim (40).
4. A fuel injector according to Claim 3, characterized in that said outer flow gap (42) is provided at the vicinity of the outer periphery (44) of the shim (40).
5. A fuel injector according to Claim 1 , characterized in that at least one inner flow gap (41 ) is provided in the vicinity of the center of the shim (40).
6. A fuel injector according to any one of the preceding claims, characterized in that the shim (40) outer diameter (d3) is greater than the holder inner diameter (d1 ) defined at the holder wall (1 1 ) of the casing (10).
EP16756630.6A 2015-08-11 2016-08-09 A fuel injector with a new shim Withdrawn EP3334923A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2015/09949A TR201509949A2 (en) 2015-08-11 2015-08-11 A fuel injector with a new shim
PCT/EP2016/068937 WO2017025529A1 (en) 2015-08-11 2016-08-09 A fuel injector with a new shim

Publications (1)

Publication Number Publication Date
EP3334923A1 true EP3334923A1 (en) 2018-06-20

Family

ID=56799424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16756630.6A Withdrawn EP3334923A1 (en) 2015-08-11 2016-08-09 A fuel injector with a new shim

Country Status (3)

Country Link
EP (1) EP3334923A1 (en)
TR (1) TR201509949A2 (en)
WO (1) WO2017025529A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5312050A (en) * 1993-05-03 1994-05-17 General Motors Corporation Electromagnetic fuel injector
DE102009001706A1 (en) * 2009-03-20 2010-09-23 Robert Bosch Gmbh Residual air gap disc
DE102011086284A1 (en) * 2011-11-14 2013-05-16 Robert Bosch Gmbh Solenoid valve with a magnet assembly

Also Published As

Publication number Publication date
TR201509949A2 (en) 2017-02-21
WO2017025529A1 (en) 2017-02-16

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