EP1856404B1 - Seat-lower guide combination - Google Patents
Seat-lower guide combination Download PDFInfo
- Publication number
- EP1856404B1 EP1856404B1 EP05724908A EP05724908A EP1856404B1 EP 1856404 B1 EP1856404 B1 EP 1856404B1 EP 05724908 A EP05724908 A EP 05724908A EP 05724908 A EP05724908 A EP 05724908A EP 1856404 B1 EP1856404 B1 EP 1856404B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- seat
- fuel
- longitudinal axis
- closure member
- metering
- 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.)
- Expired - Fee Related
Links
Images
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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- 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
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1826—Discharge orifices having different sizes
-
- 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
-
- 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
- F02M61/188—Spherical or partly spherical shaped valve member ends
-
- 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
- F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
-
- 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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
-
- 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
- F02M61/165—Filtering elements specially adapted in fuel inlets to injector
Definitions
- the lower guide member and the seat have been formed as one homogeneous member.
- atomization and precision targeting of fuel can not be altered so as to meet particular requirements for different engine configurations. It would be beneficial to develop a fuel injector having a lower guide member and a seat member in precise alignment, and in which atomization and precision targeting of fuel can be altered so as to meet particular requirements for different engine configurations.
- US617394 describes a valve in which the orifice disk is formed from a multilayer laminate of sheet metal which has been deflected to form a fixed valve seat.
- Fuel inlet tube 50, stator 52, non-magnetic shell 54, and valve body 56 are joined preferably by hermetic laser welds to form a fluid-tight flow path between the fuel injector inlet and the fuel injector outlet.
- the seat-lower guide 110 is coupled at the outlet end of valve body 56 by a suitable coupling technique, such as, crimping, welding, bonding or riveting.
- Fuel After passing through adjustment tube 58, fuel enters a volume 73 that is cooperatively defined by adjustment tube 58, stator 52 and armature 64 and that contains coil spring 62.
- Armature 64 includes a passageway 74 that communicates volume 73 with a passageway 75 in valve body 56.
- fuel may flow from volume 73, through passageways 74, 75, through passage holes 120 in the seat-lower guide 110, to the seat portion 114 of the deep drawn seat-lower guide 110.
Description
- This application claims the benefit of the earlier filing date of
U.S. Provisional Application No. 60/551,304, filed March 8, 2004 - The invention relates generally to a fuel injector for an internal combustion engine, and more particularly to a fuel injector in which atomization and precision targeting of fuel can be altered so as to meet particular requirements for different engine configurations.
- Most modem automotive fuel systems utilize fuel injectors to provide precise metering of fuel for introduction into each combustion chamber of an internal combustion engine. The fuel injectors atomize the fuel during injection, breaking the fuel into a large number of very small particles, increasing the surface area of the fuel being injected, and allowing an oxidizer, typically ambient air, to thoroughly mix with the fuel prior to combustion. The metering and atomization of the fuel reduces combustion emissions and increases the fuel efficiency of the engine. Thus, as a general rule, the greater the precision in metering and targeting of the fuel, and the greater the atomization of the fuel, the lower the emissions and the greater the fuel efficiency.
- The fuel injector is typically mounted upstream of the intake valve in the intake manifold proximate a cylinder head. As the intake valve opens on an intake port of the cylinder, fuel is sprayed towards the intake port. In one situation, it may be desirable to target the fuel spray at the intake valve head or stem while in another situation, it may be desirable to target the fuel spray at the intake port instead of at the intake valve. In both situations, the targeting of the fuel spray can be affected by the spray pattern. Where the spray pattern has a large divergent cone shape, the sprayed fuel may impact on a surface of the intake port rather than towards its intended target. Conversely, where the spray pattern has a narrow divergent cone shape, the fuel may not atomize and may even recombine into a liquid stream. In either case, incomplete combustion may result, leading to an increase in undesirable exhaust emissions.
Complicating the requirements for targeting and spray pattern are cylinder head configuration and intake geometry specific to different engine designs. As a result, a fuel injector designed for a specified cone pattern and targeting of the fuel spray may work extremely well in one type of engine configuration but may present emissions problems upon installation in a different type of engine configuration.
An electro-magnetic fuel injector typically utilizes a solenoid assembly to supply an actuating force to a fuel metering assembly. Typically, the fuel metering assembly is a plunger-style closure member which reciprocates between a closed position, where the closure member is positioned in a seat to prevent fuel from escaping through a metering orifice into the combustion chamber, and an open position, where the closure member is lifted from the seat, allowing fuel to discharge through the metering orifice for introduction into the combustion chamber. In reciprocating between the open and closed position, the closure member is positioned by a lower guide member that facilitates a proper contact with the seat. In known fuel injectors the lower guide member and the seat are two separate parts that need to be properly aligned during assembly of the fuel injector. A misalignment of the two parts may cause leakage of the fuel injector that will adversely affect precision metering and targeting of the fuel. To prevent such misalignment, the lower guide member and the seat have been formed as one homogeneous member. However, in known homogeneous lower guide and seat members, atomization and precision targeting of fuel can not be altered so as to meet particular requirements for different engine configurations.
It would be beneficial to develop a fuel injector having a lower guide member and a seat member in precise alignment, and in which atomization and precision targeting of fuel can be altered so as to meet particular requirements for different engine configurations.
US617394 describes a valve in which the orifice disk is formed from a multilayer laminate of sheet metal which has been deflected to form a fixed valve seat. - A preferred embodiment provides a fuel injector for an internal combustion engine, including a housing, a homogeneous member defining a continuous wall having a seat portion and a guide portion, a closure member, and a metering disk. The housing includes an inlet and an outlet disposed along a longitudinal axis. The homogeneous member is disposed proximate the outlet. The seat portion includes a sealing surface and a seat orifice. The closure member is disposed in the housing and positioned by the guide portion for reciprocal motion along the longitudinal axis between a first position such that the closure member is displaced from the seat, allowing fuel flow past the closure member, and a second position such that the closure member is contiguous the seat, precluding fuel flow past the closure member. The metering disk is proximate the seat orifice.
- Another preferred embodiment provides a method of manufacturing a fuel injector for an internal combustion engine. The fuel injector includes a housing having an inlet and an outlet disposed along a longitudinal axis, and a closure member disposed in the housing. The method includes providing a homogeneous member disposed proximate the outlet and defining a continuous wall having a seat portion and a guide portion. The seat portion includes a sealing surface and a seat orifice. The closure member is positioned by the guide portion and contiguous the seat portion. The method includes providing a metering disk proximate the seat orifice, the metering disk having a plurality of metering orifices configured to form a spray pattern particular to the internal combustion engine.
- The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate the presently preferred embodiments of the invention, and together with the general description given above and the detailed description given below, serve to explain features of the invention.
-
Fig. 1 is a cross-sectional view of a fuel injector including a seat-lower guide combination, according to an embodiment of the invention. -
Fig. 2 is an enlarged view of the seat-lower guide combination ofFig. 1 . -
Fig. 3 is a perspective view of the seat-lower guide combination, according to an embodiment of the invention. -
Fig. 4 is cut-away view of the seat-lower guide combination ofFig. 3 . - A preferred embodiment of a fuel injector having a seat-
lower guide combination 110 is illustrated inFig. 1 .Fig. 2 is an enlarged view of the seat-lower guide combination 110 fixed to an outlet of the fuel injector. The fuel injector includes: afuel inlet tube 50, astator 52, a non-magnetic shell 54, avalve body 56, ametering disc 112, anadjustment tube 58, afilter assembly 60, acoil spring 62, anarmature 64, aclosure member 66, an overmold 68, a coil assembly 70 and a coil assembly housing 72. -
Fuel inlet tube 50,stator 52, non-magnetic shell 54, andvalve body 56 are joined preferably by hermetic laser welds to form a fluid-tight flow path between the fuel injector inlet and the fuel injector outlet. The seat-lower guide 110 is coupled at the outlet end ofvalve body 56 by a suitable coupling technique, such as, crimping, welding, bonding or riveting. - In the calibrated fuel injector,
adjustment tube 58 has been positioned along longitudinal axis A-A withinstator 52 to compresscoil spring 62 to a desired bias force that urges thearmature 64 andclosure member 66 such that the rounded tip end ofclosure member 66 can be seated on aseat portion 114 of the seat-lower guide 110 to close anorifice 118.Filter assembly 60 can be fitted proximate an open upper end ofadjustment tube 58 to filter particulate matter from fuel passing through the fuel injector. - After passing through
adjustment tube 58, fuel enters avolume 73 that is cooperatively defined byadjustment tube 58,stator 52 andarmature 64 and that containscoil spring 62.Armature 64 includes apassageway 74 that communicatesvolume 73 with apassageway 75 invalve body 56. Thus fuel may flow fromvolume 73, throughpassageways passage holes 120 in the seat-lower guide 110, to theseat portion 114 of the deep drawn seat-lower guide 110. - Coil assembly 70 includes a
plastic bobbin 76 on which anelectromagnetic coil 78 is wound. Respective terminations of thecoil 78 connect torespective terminals 80 that are shaped and, in cooperation with asurround 82 formed as an integral part of overmold 68, form an electrical connector for connecting the fuel injector to an electronic control circuit (not shown) that operates the fuel injector. - In operation, the fuel injector is initially at the non-injecting position shown in
Fig. 1 . In this position, a workinggap 84 exists between the annular end face ofstator 52 and the confronting annular end face ofarmature 64. Non-magnetic shell 54 assures that whenelectromagnetic coil 78 is energized, the magnetic flux will follow a path that includesarmature 64. Starting at the lower axial end of housing 72, the magnetic circuit extends throughvalve body 56 toarmature 64, and fromarmature 64 across theworking gap 84 tostator 52, and back to housing 72. Whenelectromagnetic coil 78 is energized, the spring force onarmature 64 is overcome andarmature 64 is attracted towardstator 52 reducing theworking gap 84. Thisunseats closure member 66 fromseat portion 114 to open the fuel injector so that pressurized fuel in thevalve body 56 flows throughpassage holes 120 in the seat-lower guide 110, throughorifice 118, into achamber 126 and through theorifices 128 patterned on ametering disc 112. When thecoil 78 ceases to be energized,coil spring 62 pushes the armature/closure member closed onseat portion 114. -
Fig. 3 illustrates a preferred embodiment of the seat-lower guide combination 110.Fig. 4 is a cut-away view of the seat-lower guide combination 110. In the preferred embodiment, seat-lower guide combination 110 is a homogeneous member formed as a continuous wall. Preferably the continuous wall is formed of metal by a deep drawn manufacturing process. However, the continuous wall may be formed of other materials and by other processes so long as aseat portion 114 and aguide portion 116 of the seat-lower guide combination 110 are properly aligned with respect to each other.Guide portion 116 defines a cylinder disposed along the longitudinal axis A-A.Seat portion 114 generally defines a conic frustum disposed along the longitudinal axis A-A, and having its base integrally formed with one end ofguide portion 116, and its apex forming anorifice 118. Passage holes 120 radially spaced about longitudinal axis A-A by equal intervals penetrate the seat-lower guide combination at a wall portion intermediate the guide portion and seat portion. As illustrated inFig. 2 ,guide portion 116 properly positions theclosure member 66 onseat portion 114 to form a fluid-tight seal betweenclosure member 66 andseat portion 114.Guide portion 116 andseat portion 114 being formed as a homogeneous member precludes misalignment between these portions that could occur if the portions were separate parts that needed to be aligned with respect to each other during assembly of the fuel injector. - In the preferred embodiment, the continuous wall of seat-
lower guide combination 110 may further include a meteringdisk support portion 122 and a retainingportion 124, both being formed integrally with the guide portion and the seat portion. Retainingportion 124 forms a fluid tight connection with an outer surface ofvalve body 56 proximate the outlet of the fuel injector, as illustrated inFig. 2 .Portion 122 defines an annulus extending between the apex ofseat portion 114 and the retainingportion 124, and supports themetering disk 112. As shown inFig. 2 andFig. 4 ,portion 122 extends radially outward at an oblique angle from longitudinal axis A-A and forms achamber 126 withmetering disk 112.Metering disk 112 includes a plurality oforifices 128 to allow fuel to be discharged from the fuel injector.Different metering disks 112 having different size, shape, number and pattern oforifices 128 may be fixed to meteringdisk support portion 122 so that atomization and precision targeting of fuel can be altered to meet particular requirements for different engine configurations. For example, the seat-lower guide 110 can be used with the fuel injector/metering disk arrangements disclosed in co-pending application nos.10/183,406 filed June 28, 2002 10/183,392 filed June 28, 2002 10/753,378 filed January 9, 2004 10/753,481 filed January 9, 2004 10/753,377 filed January 9, 2004 - While the invention has been disclosed with reference to certain preferred embodiments, numerous modifications, alterations, and changes to the described embodiments are possible without departing from the sphere and scope of the invention, as defined in the appended claims. Accordingly, it is intended that the invention not be limited to the described embodiments, but that it have the full scope defined by the language of the following claims.
Claims (2)
- A fuel injector for an internal combustion engine, comprising:a housing having an inlet and an outlet disposed along a longitudinal axis (A-A);a homogeneous member (110) disposed proximate the outlet and defining a continuous wall that is formed of metal by a deep-drawn manufacturing process the continuous wall including:a guide portion (116) defining a cylinder disposed along the longitudinal axis;a seat portion (114) having a sealing surface and a seat orifice, the seat portion defining a conic frustum disposed along the longitudinal axis, the conic frustum having a base and an apex, the base being integrally formed with one end of the cylinder, and the apex forming the seat orifice;a retaining portion (124) that fixes the homogeneous member to the housing outlet;a support portion (122) that attaches a metering disk thereto, the support portion defining an annulus extending radially between the apex of the seat portion and the retaining portion, at an oblique angle from the longitudinal axis; anda plurality of passage holes (120) radially spaced about the longitudinal axis and formed in the continuous wall intermediate the guide portion and the seat portion;a closure member (66) in the housing positioned by the guide portion for reciprocal motion along the longitudinal axis between a first position wherein the closure member is displaced from the seat, allowing fuel flow past the closure member, and a second position wherein the closure member is contiguous the seat, precluding fuel flow past the closure member; anda metering disk (112) fixed to the support portion proximate the seat orifice, the metering disk having a plurality of metering orifices configured to form a spray pattern particular to the internal combustion engine.
- The fuel injector of claim 1, wherein the support portion (122) and the metering disk (112) define a chamber (126).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/072,459 US7334746B2 (en) | 2004-03-08 | 2005-03-07 | Seat-lower guide combination |
PCT/US2005/007470 WO2006096174A1 (en) | 2005-03-07 | 2005-03-08 | Seat-lower guide combination |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1856404A1 EP1856404A1 (en) | 2007-11-21 |
EP1856404B1 true EP1856404B1 (en) | 2008-11-05 |
EP1856404B8 EP1856404B8 (en) | 2009-01-14 |
Family
ID=34962228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05724908A Expired - Fee Related EP1856404B8 (en) | 2005-03-07 | 2005-03-08 | Seat-lower guide combination |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1856404B8 (en) |
JP (1) | JP2008531927A (en) |
DE (1) | DE602005010911D1 (en) |
WO (1) | WO2006096174A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4446241A1 (en) * | 1994-12-23 | 1996-06-27 | Bosch Gmbh Robert | Fuel injector |
DE19653832A1 (en) * | 1996-12-21 | 1998-06-25 | Bosch Gmbh Robert | Valve with combined valve seat body and spray orifice plate |
DE19712922B4 (en) * | 1997-03-27 | 2005-08-11 | Robert Bosch Gmbh | Fuel injector |
JPH10299605A (en) * | 1997-04-18 | 1998-11-10 | Unisia Jecs Corp | Fuel injector |
DE19726991A1 (en) * | 1997-06-25 | 1999-01-07 | Bosch Gmbh Robert | Valve and method for manufacturing a valve seat for a valve |
DE10319694A1 (en) * | 2003-05-02 | 2004-12-02 | Robert Bosch Gmbh | Fuel injector |
-
2005
- 2005-03-08 WO PCT/US2005/007470 patent/WO2006096174A1/en active Application Filing
- 2005-03-08 EP EP05724908A patent/EP1856404B8/en not_active Expired - Fee Related
- 2005-03-08 JP JP2008500684A patent/JP2008531927A/en active Pending
- 2005-03-08 DE DE602005010911T patent/DE602005010911D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1856404A1 (en) | 2007-11-21 |
DE602005010911D1 (en) | 2008-12-18 |
JP2008531927A (en) | 2008-08-14 |
EP1856404B8 (en) | 2009-01-14 |
WO2006096174A1 (en) | 2006-09-14 |
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