EP1537326A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1537326A1 EP1537326A1 EP03761365A EP03761365A EP1537326A1 EP 1537326 A1 EP1537326 A1 EP 1537326A1 EP 03761365 A EP03761365 A EP 03761365A EP 03761365 A EP03761365 A EP 03761365A EP 1537326 A1 EP1537326 A1 EP 1537326A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fuel injection
- injection valve
- fuel
- recesses
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 35
- 239000007924 injection Substances 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 title claims description 15
- 239000000446 fuel Substances 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims description 33
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000013532 laser treatment Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000737 periodic effect Effects 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
- 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
- F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
-
- 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
- F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
-
- 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
- F02M61/16—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
- F02M61/1866—Valve seats or member ends having multiple cones
Definitions
- the invention is based on a fuel valve for internal combustion engines, as is known from DE 190 31 264 AI.
- the fuel injection valve comprises a valve body, in which a piston-shaped valve needle is arranged so that it can be moved slowly in a bore.
- the valve needle has a valve sealing surface on its combustion chamber end, which also includes a conical surface. With its valve sealing surface, the valve needle interacts with a conical valve seat in such a way that, when the valve needle is lifted off the valve seat, fuel flows through from a pressure space between the valve sealing surface and the valve seat to at least one clamping opening. If the valve needle is in contact with the valve seat, this flow of fuel to the injection openings is interrupted.
- the known fuel injection valve has the particular disadvantage that excessive friction and thus high wear can occur between the valve sealing surface and the valve seat, which considerably affects the service life of the fuel injection valve.
- the valve needle closes, i.e. when it moves in contact with the valve seat, the fuel located between the valve sealing surface and the valve seat must first be displaced. Since both the valve seat and the valve sealing surface due to their smooth upper flat favor easy drainage of the displaced fuel, the valve needle hits the valve seat relatively hard, which can result in excessive wear in this area during the life of the fuel injector.
- Another mechanism for increased wear between the valve seat and valve sealing surface, which occurs when the fuel injection valve is closed, is based on pressure fluctuations of the valve body in the region of the valve seat. This is due to the fact that the fuel that flows between the valve sealing surface and the valve seat to the injection openings is stopped abruptly by closing the valve needle. The kinetic energy of the fuel is converted into compression work, so that a pressure surge is generated, which triggers a gradually decaying pressure wave. The pressure wave causes a periodic widening of the valve body in the area of the valve seat and thus a slight relative movement of the valve seat and valve needle, which leads to increased wear in the valve seat area over time.
- the valve sealing surface comprises at least one conical surface, on which a plurality of depressions are formed which are distributed over the circumference and which have a non-constant depth. It can also be provided that such depressions are formed on the valve seat or both on the conical surface of the valve sealing surface and on the valve seat.
- the damage caused by the closing movement of the valve needle Urged fuel can no longer drain through the depressions as quickly as this causes the flow to swirl.
- a fuel cushion remains between the valve sealing surface and the valve seat, which dampens the impact of the valve needle on the valve seat.
- This turbulence can be optimized by a non-constant depth of the depressions, so that a relatively small absolute depth of the depressions is sufficient to achieve the desired effect.
- the recesses do more
- Fuel remains between the valve sealing surface and the valve seat and so there is always a sufficient lubricating film which significantly reduces the wear between the valve sealing surface and the valve seat in the event of pressure fluctuations in the region of the valve seat.
- At least some of the depressions are triangular.
- the formation of isosceles triangles is particularly advantageous here, the depth of the depressions being the lowest at the tip of the isosceles triangle and highest on the base side.
- the tip of the triangle advantageously points either in the direction of flow of the fuel or counter to the direction of flow, depending on where the depression is located on the valve sealing surface.
- At least some of the depressions are designed as trapezoids or have the shape of an elongated hole. Both forms have proven to be advantageous in terms of the desired degree of swirling to reach in the area of the valve seat or the valve sealing surface.
- the bottom of the depressions is flat and points opposite the
- the bottom of the depressions can also be advantageous to design the bottom of the depressions to be arched, which is readily possible using modern manufacturing techniques, in particular machining with a laser.
- the swirling can also be optimized by shaping the floor accordingly.
- FIG. 1 shows a longitudinal section of a fuel injection valve in its essential region
- FIG. 2 shows an enlargement of the section from FIG. 1 designated by II, various recesses being formed on the valve sealing surface by way of example,
- FIG. 3 shows an enlargement of a triangular depression
- FIG. 3b shows a cross section through the depression
- Figure 4d and FIG. 4e show further exemplary embodiments of depressions, in particular further configurations of the floor area.
- a fuel injector is shown in essential section in longitudinal section.
- the fuel injection valve has a valve body 1, in which a bore 3 is formed.
- the bore 3 is delimited at its end on the combustion chamber side by a conical valve seat 9, from which a plurality of injection openings 11 extend and connect the valve seat 9 to the combustion chamber of the internal combustion engine.
- a piston-shaped valve needle 5 is arranged in the bore 3 in a slowly displaceable manner and is guided with a guided section 15 in a sealing manner in the section of the bore 3 facing away from the combustion chamber. Starting from the guided section 15, the valve needle 5 tapers towards the combustion chamber to form a pressure shoulder 13 and merges into an essentially conical valve sealing surface 7 at its end on the combustion chamber side.
- an annular channel-shaped pressure chamber 19 which is radially expanded at the height of the pressure shoulder 13.
- an inlet channel 25 runs in the valve body 1, via which the pressure chamber 19 can be filled with fuel under high pressure.
- the valve needle 5 is acted upon at its end on the combustion chamber side by a closing force which presses the valve needle 5 in the direction of the valve seat 7.
- the closing force can be generated, for example, by a spring or a hydraulic device and can be variable over time or also constant.
- the valve needle 5 is moved by the ratio of two forces, namely the closing force on the end of the valve needle 5 facing away from the combustion chamber and hydraulic forces on the pressure shoulder 13 and on parts of the valve sealing surface 7 which are opposite to the closing force. If the hydraulic forces predominate, the valve needle 5 moves with its valve sealing surface 7 away from the valve seat 9 and fuel can flow from the pressure chamber 19 between the valve sealing surface 7 and the valve seat 9 to the injection openings 11, from where the fuel enters the combustion chamber the internal combustion engine is injected, on the other hand, the closing force on the valve needle 5 predominates, be it that the closing force is increased or that the hydraulic force drops due to a throttling of the fuel supply in the pressure chamber 19, the valve needle 5 moves back into contact with the valve seat 9 , so that a further injection of fuel is interrupted by the injection openings 11.
- FIG. 2 shows an enlargement of the section from FIG. 1 designated II.
- the valve sealing surface 7 comprises a first conical surface 30 and a second conical surface 32, which are separated from one another by an annular groove 21.
- the opening angle of the first cone surface 30 is smaller than the opening angle of the conical valve seat 9, while the second cone surface 32 has an opening angle that is larger than the opening angle of the valve seat 9.
- a first sealing edge 23 is formed at the transition from the first cone surface 30 to the annular groove 21 and a second sealing edge 24 is formed at the transition from the annular groove 21 to the second cone surface 32 the first sealing edge 23 and also the second sealing edge 24 due to a slight elastic deformation of valve needle 5 or valve body 1 against the valve seat 9, the surface pressure in the area of the first sealing edge 23 being higher than in the area of the second sealing edge 24. Therefore, it lifts in the opening stroke movement of the valve needle 5 first the second sealing edge 24 from the valve seat 9 and only then the first sealing edge 23.
- a plurality of depressions 40 are formed on the first cone surface 30 and on the second cone surface 32, which are embodied here in various forms by way of example. Which shapes of the depressions 40 are selected and how many depressions 40 are arranged in which orientation on the conical surfaces 30, 32 depends on the flow conditions in the individual fuel injection valve.
- a triangular depression 140 is formed on the first conical surface 30 and has the shape of an isosceles triangle. The tip of the triangular depression 140 points in the direction of the injection openings 11, that is to say in the direction of flow of the fuel. However, the orientation of the triangular depression 140 can also be rotated, as in the triangular depression 240, in which the tip of the isosceles triangle points away from the injection openings 11.
- two triangular depressions 40 are shown on the second conical surface 32, the tips of which point away from the injection openings 11.
- a trapezoidal depression 340 is also shown as a further exemplary embodiment, the short side of the sides parallel to one another
- Injection openings 11 is facing.
- the first conical surface 30 shows a slot-shaped depression 440, the ends of which are rounded and the sides of which are parallel to one another.
- Corresponding depressions 40 are also shown on the second cone surface 32 in different orientations, with orientations other than those shown here being possible with all depressions 140, 240, 340, 440.
- Figure 3a shows a triangular depression 40, which is an isosceles triangle with a base 44 and one Tip 46 is formed.
- the length of the base 44 is denoted by b and the height of the isosceles triangle, ie the distance of the tip 46 from the base 44, is denoted by a.
- FIG. 3b shows the same depression 40 in a longitudinal section, so that the high profile becomes clear.
- the depression 40 has a bottom 42, which is flat and has its maximum depth t on the base side 44, while the depth 46 is 0 mm at the tip 46. At different points, the depression 40 therefore has a different depth t.
- This height profile of the depression 40 results in a maximum swirling at a very small depth t, so that the valve needle 5 is only insignificantly mechanically weakened by the depressions 40.
- the maximum depth of the depressions 40 is less than 0.2 mm, preferably less than 0.05 mm.
- FIG. 4a once again shows the course of the bottom surface 42 shown in FIG. 3b, in which a wedge results in the longitudinal section of the triangular depression 140.
- FIG. 4b shows a different course of the floor surface 42, in which no steep drop is provided on the base side 44, but also a bevel, so that the floor surface 42 consists of two part planes with different inclinations.
- FIG. 4c shows a further exemplary embodiment, in which the bottom surface 42 consists of two inclined sections with different inclinations and a flat base surface.
- FIG. 4d shows a course similar to FIG. 4a, but here the bottom surface 42 is curved concavely and is not flat.
- the floor surface 42 is also curved in the exemplary embodiment in FIG. 4e, but the curvature here is concave.
- the depressions 40 can be introduced using various methods.
- laser treatment is particularly suitable, in which indentations of various shapes can be produced.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10240827 | 2002-09-04 | ||
| DE10240827A DE10240827A1 (de) | 2002-09-04 | 2002-09-04 | Kraftstoffeinspritzventil für Brennkraftmaschine |
| PCT/DE2003/001333 WO2004027255A1 (de) | 2002-09-04 | 2003-04-24 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1537326A1 true EP1537326A1 (de) | 2005-06-08 |
| EP1537326B1 EP1537326B1 (de) | 2009-07-08 |
Family
ID=31724318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03761365A Expired - Lifetime EP1537326B1 (de) | 2002-09-04 | 2003-04-24 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1537326B1 (de) |
| AT (1) | ATE435972T1 (de) |
| DE (2) | DE10240827A1 (de) |
| WO (1) | WO2004027255A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2613396A (en) * | 2021-12-02 | 2023-06-07 | Delphi Tech Ip Ltd | Fuel injector suitable for gaseous fuel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010000754A1 (de) * | 2010-01-08 | 2011-07-14 | Robert Bosch GmbH, 70469 | Brennstoffeinspritzventil |
| FR3052192B1 (fr) * | 2016-06-03 | 2021-02-26 | Continental Automotive France | Dispositif pour injecter un fluide sous pression |
| GB2551169B (en) * | 2016-06-08 | 2019-12-25 | Delphi Tech Ip Ltd | Fuel injector nozzle |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60142051A (ja) * | 1983-12-28 | 1985-07-27 | Toyota Motor Corp | 内燃機関の燃料噴射弁 |
| JPH10184495A (ja) * | 1996-12-24 | 1998-07-14 | Zexel Corp | 可変噴孔型燃料噴射ノズルによる燃料噴射制御方法 |
| JPH11280610A (ja) * | 1998-03-30 | 1999-10-15 | Isuzu Motors Ltd | 燃料噴射ノズル |
| JP3817959B2 (ja) * | 1999-03-16 | 2006-09-06 | トヨタ自動車株式会社 | 燃料噴射ノズル |
| DE10005009A1 (de) * | 2000-02-04 | 2001-08-09 | Daimler Chrysler Ag | Beeinflussung des Einspritzverlaufs und -druckes bei Common-Rail-Systemen |
| DE10031264A1 (de) | 2000-06-27 | 2002-01-17 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| JP2002250259A (ja) * | 2001-02-23 | 2002-09-06 | Toyota Motor Corp | 燃料噴射ノズル及び同ノズルの製造方法 |
| DE10149277A1 (de) * | 2001-10-05 | 2003-04-24 | Siemens Ag | Kraftstoffeinspritzventil |
-
2002
- 2002-09-04 DE DE10240827A patent/DE10240827A1/de not_active Withdrawn
-
2003
- 2003-04-24 AT AT03761365T patent/ATE435972T1/de not_active IP Right Cessation
- 2003-04-24 WO PCT/DE2003/001333 patent/WO2004027255A1/de not_active Ceased
- 2003-04-24 EP EP03761365A patent/EP1537326B1/de not_active Expired - Lifetime
- 2003-04-24 DE DE50311689T patent/DE50311689D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004027255A1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2613396A (en) * | 2021-12-02 | 2023-06-07 | Delphi Tech Ip Ltd | Fuel injector suitable for gaseous fuel |
| GB2613396B (en) * | 2021-12-02 | 2024-03-20 | Delphi Tech Ip Ltd | Fuel injector suitable for gaseous fuel |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE435972T1 (de) | 2009-07-15 |
| EP1537326B1 (de) | 2009-07-08 |
| DE50311689D1 (de) | 2009-08-20 |
| DE10240827A1 (de) | 2004-03-18 |
| WO2004027255A1 (de) | 2004-04-01 |
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