EP2304219A1 - Kraftstoffinjektor mit hochdruckzulauf - Google Patents
Kraftstoffinjektor mit hochdruckzulaufInfo
- Publication number
- EP2304219A1 EP2304219A1 EP09779486A EP09779486A EP2304219A1 EP 2304219 A1 EP2304219 A1 EP 2304219A1 EP 09779486 A EP09779486 A EP 09779486A EP 09779486 A EP09779486 A EP 09779486A EP 2304219 A1 EP2304219 A1 EP 2304219A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fan
- fuel injector
- inlet bore
- contour
- section
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/008—Arrangement of fuel passages inside of 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
- 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
Definitions
- the invention relates to a KrafStoffinjektor for the operation of an internal combustion engine having an injector body, wherein an inlet bore connects a conical pressure port with a valve chamber for supplying fuel under high pressure, wherein the valve chamber is placed along a longitudinal center axis of the injector body and above a nozzle needle.
- a fuel injector in whose injector body a valve chamber communicates via an inlet bore with a pressure port. Furthermore, in the region of the intersections between the valve space and the inlet bore, bulges in the cross section are provided in order to reduce the notch stresses in this area and thus to achieve an overall higher pressure resistance of the injector body.
- a disadvantage of the known prior art is that in the present systems, the production cost is high and the stresses occurring in the field of intersections an improvement in the geometry of the same can be further reduced.
- the invention comprises the technical teaching that, starting from a pressure connection of the fuel injector, the inlet bore has a fan-like contour with a specific fan angle and a variable cross section in a slot-like shape along its extension.
- an enlarged pressure surface is generated in the axial direction, which leads to a reduction in voltage in the region of the intersection of inlet bore and valve chamber.
- a shift of the maximum stress can be achieved from the range of the Verschneidungslinien in the axial region of the inlet bore, whereby the processing cost in the area of the intersections can be reduced.
- optimal material utilization is achieved by the fan-like design of the inlet bore.
- fan-like in this case means that the bore, starting from the pressure port, widens its cross-section in the direction of the valve space along a defined angle the variable cross-section of the inlet bore has the shape of a slot, wherein due to the processing of the inlet bore edges can protrude into this slot shape and change them accordingly slightly.
- the fan-like contour is formed by at least two holes, wherein the center axes of the respective outer holes, starting from a connection axis pressure connection - valve chamber pivoted by half the fan angle in each case
- the fan-like contour of the inlet bore can be produced with low production costs by two holes are set in the simplest case, which are pivoted to form the fanning of the inlet corresponding to half the fan angle with respect to the lying between the valve chamber and pressure connection axis connection.
- the fan-like contour is formed by a plurality of holes to obtain a slot-shaped cross-section.
- a smooth contour of the inlet bore can be achieved, which improves the flow characteristic via the inlet bore.
- this embodiment of the fan hole can be made by a cutter, which is pivoted about the point of the pressure port starting from a connecting axis to the valve chamber by half the fan angle. It is also conceivable, however, to manufacture the contour by means of electrochemical shaping or roughing eroding.
- the respective outer holes of the fan-like contour of the inlet bore with their central axes are not outside each tangent of the same angle Cross section of the valve chamber. It is advantageous here that the outer regions of the inlet bore are not too far outside of the valve chamber and thus does not have to be too strong deflection of the flowing fuel in the direction of the valve chamber.
- the fan-like contour of the inlet bore has, at its end facing the valve chamber, the shape of a concavely curved ring section.
- the fan angle is in the range of 20 ° -30 °. This value range defines an optimal widening of the inlet bore.
- the fan-like contour of the inlet bore in the direction of the longitudinal central axis of the injector body has an extension in the range of 2 mm - 5 mm. In this size range, a sufficient cross section for supplying fuel through the inlet bore is achieved.
- the valve chamber has an oblong-hole-shaped or elliptical cross-section, wherein outer holes defining the cross-section are offset outwardly by an amount of 0.1 mm to 0.2 mm from the longitudinal central axis of the injector body.
- Fig.l a sectional view of an inventive
- Fuel injector cut in the region of the inlet bore perpendicular to the longitudinal center axis of the Injektorgropers;
- Fig. 2 is a sectional view of the fuel injector taken along the line A-A in Fig.l;
- FIG. 3 is a sectional view of the fuel injector, taken along the line B-B in Fig.l.
- FIG. 1 shows a sectional view of the fuel injector according to the invention, the section being placed perpendicular to a longitudinal center axis of the injector body 1.
- an inlet bore 2 connects a conical pressure port 3 with a valve space 4.
- the valve chamber 4 is designed elliptical. In order to produce an enlarged pressure surface in the axial direction of the inlet bore 2, this is fan-shaped and extends from the conical pressure port 3 at the angle ⁇ in the direction of the valve chamber 4.
- such an inlet bore 2 is generated by three individual holes in the
- Injector body 1 are made.
- the first bore is thereby guided starting from the conical pressure port 3 straight in the direction of the longitudinal central axis of the injector body 1.
- the two outer holes are created by turn starting from the pressure port 3 by half the fan angle ⁇ pivoted in the direction of the valve chamber 4 is drilled.
- the inlet bore 2 also has a rounding 5 with the shape of a concave-shaped ring portion in order to improve the flow characteristics in the valve chamber 4 in this area.
- the inlet bore 2 edges 6a-6d which arise due to the overlap of the individual bores to form the inlet bore 2.
- FIGS. 2 and 3 show further sectional views of the fuel injector according to the invention, from which in particular the geometry of the inlet bore 2 emerges.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008040383A DE102008040383A1 (de) | 2008-07-14 | 2008-07-14 | Hochdruckfester Kraftstoffinjektor |
PCT/EP2009/055891 WO2010006828A1 (de) | 2008-07-14 | 2009-05-15 | Kraftstoffinjektor mit hochdruckzulauf |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2304219A1 true EP2304219A1 (de) | 2011-04-06 |
EP2304219B1 EP2304219B1 (de) | 2012-12-26 |
Family
ID=41064591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09779486A Active EP2304219B1 (de) | 2008-07-14 | 2009-05-15 | Kraftstoffinjektor mit hochdruckzulauf |
Country Status (5)
Country | Link |
---|---|
US (1) | US8608093B2 (de) |
EP (1) | EP2304219B1 (de) |
JP (1) | JP5200166B2 (de) |
DE (1) | DE102008040383A1 (de) |
WO (1) | WO2010006828A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2320084B1 (de) * | 2009-11-06 | 2012-09-12 | Delphi Technologies Holding S.à.r.l. | Gehäuse mit sich überschneidenden Durchgängen für Hochdruck-Flüssigkeitsanwendungen |
AT512893B1 (de) * | 2013-02-05 | 2013-12-15 | Bosch Gmbh Robert | Bauelement mit ineinandermündenden Hochdruckbohrungen |
GB201516152D0 (en) * | 2015-09-11 | 2015-10-28 | Delphi Int Operations Lux Srl | Fuel pump housing |
DE102016203229A1 (de) | 2016-02-29 | 2017-08-31 | Robert Bosch Gmbh | Elektrodenanordnung und Verfahren zur elektrochemischen Bearbeitung eines metallischen Bauteils, insbesondere eines Kraftstoffinjektorgehäuses |
DE102019216166A1 (de) * | 2019-10-21 | 2021-04-22 | Robert Bosch Gmbh | Innendruckbelastetes Bauteil, insbesondere für die Kraftstoffeinspritzung bei einem Verbrennungsmotor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2285096B (en) | 1993-12-27 | 1997-12-03 | Caterpillar Inc | Method of operating a high-pressure apparatus such as a fuel injector |
DE19937946C1 (de) * | 1999-08-11 | 2001-04-19 | Bosch Gmbh Robert | Kraftstoffhochdruckspeicher für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen |
JP2001295723A (ja) * | 2000-04-13 | 2001-10-26 | Denso Corp | 蓄圧式燃料噴射装置 |
DE10132246A1 (de) | 2001-07-04 | 2003-01-23 | Bosch Gmbh Robert | Kraftstoffinjektor mit hochdruckfestem Zulauf |
DE10152230A1 (de) | 2001-10-20 | 2003-04-30 | Bosch Gmbh Robert | Hochdruckfester Injektorkörper |
DE602006005169D1 (de) * | 2006-11-27 | 2009-03-26 | Delphi Tech Inc | Gehäuse mit sich überschneidenden Durchgängen |
-
2008
- 2008-07-14 DE DE102008040383A patent/DE102008040383A1/de not_active Withdrawn
-
2009
- 2009-05-15 WO PCT/EP2009/055891 patent/WO2010006828A1/de active Application Filing
- 2009-05-15 EP EP09779486A patent/EP2304219B1/de active Active
- 2009-05-15 US US13/003,197 patent/US8608093B2/en active Active
- 2009-05-15 JP JP2011517826A patent/JP5200166B2/ja active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010006828A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8608093B2 (en) | 2013-12-17 |
EP2304219B1 (de) | 2012-12-26 |
JP5200166B2 (ja) | 2013-05-15 |
WO2010006828A1 (de) | 2010-01-21 |
DE102008040383A1 (de) | 2010-01-21 |
US20110114762A1 (en) | 2011-05-19 |
JP2011528079A (ja) | 2011-11-10 |
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