EP1880100A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1880100A1 EP1880100A1 EP06708697A EP06708697A EP1880100A1 EP 1880100 A1 EP1880100 A1 EP 1880100A1 EP 06708697 A EP06708697 A EP 06708697A EP 06708697 A EP06708697 A EP 06708697A EP 1880100 A1 EP1880100 A1 EP 1880100A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fuel injection
- valve body
- cylindrical portion
- undercut
- 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 41
- 239000007924 injection Substances 0.000 title claims abstract description 41
- 239000000446 fuel Substances 0.000 title claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 title description 7
- 230000007704 transition Effects 0.000 claims description 23
- 230000000694 effects Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003313 weakening effect Effects 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
- 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
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
Definitions
- the invention is based on a fuel injection valve, as is known for example from the published patent application DE 100 24 703 A1.
- fuel injection valves have a housing which consists of several parts.
- the part which has the injection openings, through which the fuel is ultimately injected into the corresponding combustion chamber of the internal combustion engine, is usually referred to as a valve body or nozzle body, which is formed substantially rotationally symmetrical. Since the valve body must be connected to an associated holding body, which also
- a clamping nut which surrounds the valve body over part of its length and which comes to rest on a valve shoulder.
- the valve shoulder is formed by at least two different cylindrical portions of the valve body, wherein the first cylindrical portion, which faces the holding body, has a larger diameter than the second cylindrical portion.
- Clamping nut is screwed onto an external thread of the holding body and thereby acts on this valve shoulder, so that an axial force is exerted on the valve body in the direction of the holding body.
- Claim 1 has the advantage that the mechanical stability of the valve body is given even at high axial stress forces and high internal pressures.
- the notch stresses are minimized at the transition from the first cylindrical portion to the second cylindrical portion. This can be achieved by providing an undercut at the transition, which preferably has a flowing, rounded transition to the valve shoulder and to the second cylindrical section. This leads at this point of the valve body to a higher flexibility and thus to a compensation of the mechanical stresses, which reduces the notch stresses occurring. Even with the necessary high axial forces, the notch stresses thus remain below a critical value, so that they are not sufficient for the formation of a crack and a mechanical failure can be safely excluded at this point.
- the undercut is formed with a circular segment-shaped cross section, so that a smooth transition from the valve shoulder to the annular groove and from the annular groove to the second cylindrical portion is achieved. This minimizes remaining notch stresses and further increases strength.
- the undercut may in this case be an axial undercut, in which a rear engagement with respect to the longitudinal axis of the valve body is formed. It is also possible to design the undercut so that a rear engagement is also present in the radial direction, ie in the direction of the valve shoulder. Which of the variants in the individual case is the better, must be determined by experiments or with simulation calculations.
- a circumferential annular groove is provided, which makes the valve body specifically flexibilized in this area and thus makes it more elastically deformable.
- This annular groove can be provided either on the inside or on the outside of the second cylindrical section, whereby a flowing, rounded transition to the adjacent inside or outside of the second cylindrical section is also provided here.
- the valve body has a bore in which the valve needle is guided. Between the valve needle and the wall of the bore, a pressure chamber is formed, which is radially expanded in the region of the valve shoulder.
- the valve needle is guided in a guide section of the bore, wherein the guide section is located in the first cylindrical section of the valve body.
- the annular groove in the second cylindrical portion is spaced from this pressure chamber, so that further fuel can be introduced freely into the pressure chamber.
- the annular groove in the second cylindrical portion may in this case also be formed in addition to the undercut at the transition from the first to the second cylindrical portion. The effects overlie themselves in this case, so that the effects essentially add up.
- FIG. 1 shows a longitudinal section through an inventive fuel injection valve, wherein in the left and right half of Figure 1, two different embodiments are shown,
- Figure 2 shows an enlarged view of the designated II section of the
- FIG. 3 is an enlarged view of the detail of FIG. 1, that is to say of the second exemplary embodiment, designated III.
- Figure 4 shows another exemplary embodiment of a fuel injection valve according to the invention, in which case only the valve body is shown, the left and right half show different configurations and
- Figure 5 shows another exemplary embodiment, in which case the annular groove is formed on the inside of the valve body.
- the fuel injection valve has a housing 1 which, inter alia, comprises a valve body 3 and a holding body 5.
- the valve body 3 has a longitudinal axis 6 and is formed on its outer surface substantially rotationally symmetrical. The outer circumferential surface of the valve body 3 is thereby of a first cylindrical
- Section 103 and an adjoining second cylindrical portion 203 wherein the second cylindrical portion 203 has a smaller diameter than the first cylindrical portion 103.
- the second cylindrical portion is followed by a third cylindrical portion 303, which in turn is opposite to the second cylindrical portion 203 has slightly reduced outer diameter.
- a valve shoulder 30 is formed on the outside of the valve body 3, which is oriented in a radial plane to the longitudinal axis 6 of the valve body 3.
- the valve body 3 is surrounded in the region of the first cylindrical portion 103 and in the region of the second cylindrical portion 203 by a clamping nut 7 having an inner shoulder 8, with the clamping nut 7 on the valve shoulder 30 comes to the plant.
- the clamping nut 7 engages in a formed on the holding body 5 and not shown in the drawing external thread, so that by screwing the clamping nut 7, an axial clamping force on the valve body 3 is formed, with which this is pressed against the holding body 5.
- the valve body 3 has a bore 9 which is delimited at its combustion-chamber-side end by a substantially conical valve seat 16, in the region of which a plurality of injection ports 18 are formed, which open into a combustion chamber of the internal combustion engine in the installation position of the fuel injection valve ,
- the valve needle 12 is sealingly guided with a guide portion 112 in a guide portion 11 of the bore 3, tapers the valve seat 16 to form a pressure shoulder 21, and eventually merges into a shaft portion 212.
- a valve sealing surface 14 is formed, with which the valve needle 12 cooperates with the valve seat 16.
- a pressure chamber 20 is formed which expands radially at the level of the pressure shoulder 21 and thus forms a pressure chamber 22.
- the pressure chamber 22 can be filled with fuel under high pressure via an inlet channel 25 extending in the valve body 3 and in the holding body 5.
- a control chamber 17 is formed on its side remote from the valve seat in the valve body 3, which is bounded on the one hand by the bore 3 and on the other hand by the valve seat facing away from the end face of the valve needle 12. Facing away from the valve needle 12, the control chamber 17 is bounded by the holding body 5, wherein in the holding body 5 at least one inlet throttle 19 is formed, via which the
- Control chamber 17 can be filled with fuel.
- a high fuel pressure is always maintained in the pressure chamber 20, which corresponds to the injection pressure.
- the valve needle 12 is pressed against the valve seat 16 and closes the injection ports 18. If injection take place, the pressure in the control chamber 17 is reduced, and the valve needle 12 lifts from the valve seat 16 and thus releases the injection openings 18. As a result, fuel flows out of the pressure chamber 20, which corresponds to the injection pressure.
- FIG. 2 shows an enlarged view of the section of FIG. 1 designated by II.
- the undercut 35 has a tangential transition to the valve shoulder 30, so that the undercut 35, as shown in FIG. 2, is cut into a concave area 40 and a longitudinal section Subdivide it to subsequent convex 42. This results in respect to the longitudinal axis 6 of the valve body 3, an undercut, which leads to a minimization of the stresses in the region of the undercut 35 when an axial force is exerted on the valve body 3 via the clamping nut 7.
- Figure 3 shows an enlarged view of the designated III section of FIG
- the alternative embodiment of the undercut 35 shown here surrounds the valve body 3 over its entire circumference.
- the undercut 35 shown in FIG. 3 has an undercut both in the direction of the longitudinal axis 6 of the valve body 3 and in the direction of the valve shoulder 30. Starting from the valve shoulder 30, the undercut 35 shows a first convex portion 45, a concave portion 46 adjoining thereto, and a second convex portion 47 adjoining thereon.
- such a shape of the undercut 35 may be cheaper than the undercut 35 of Figure 2 in order to minimize the stresses in this area.
- FIG 4 shows another embodiment of the fuel injection valve according to the invention, in which case only the valve body 3 is shown.
- the structure of the valve body 3 is substantially identical to that shown in Figure 1, wherein the valve needle here for the sake of clarity was omitted.
- an annular groove 50 is formed on the inside of the bore 9 in the region of the second cylindrical portion 203 here.
- the annular groove 50 is spaced from the pressure chamber 22 and causes greater elastic deformability in this area. As a result, the notch stresses on
- the correct positioning with respect to the undercut 35 is important. That is, the appropriate axial distance must be found. This can easily be achieved by experiments or calculations, for example with the finite element method.
- the transition from the inside of the bore 9 in the region of the second cylindrical section to the annular groove 50 should also be rounded here so that the notch stresses in the annular groove 50 are not too great.
- Figure 5 shows another embodiment, wherein only the right half of the valve body 3 is shown.
- the second cylindrical portion 203 is here also an annular groove 50 'is formed, but on the outside of the valve body 3.
- the effect with respect to the voltage reduction is comparable to those in a formed on the inside of the valve body 3 annular groove 50, but the outer annular groove 50' easier to manufacture than an annular groove 50 on the hard to reach inside of the valve body 3.
- the outer annular groove 50 ' can be with an undercut 35th combine, which is shown in dashed lines in Figure 5. In this case, the effects of the undercut 35 and the annular groove 50 'are superimposed and reinforced.
- the depth of the undercut 35 is determined depending on the requirement for the voltage reduction and is in the range of preferably 0.1 to 1 mm, with a range of 0.4 to 0.6 mm has been found to be particularly advantageous.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005020364 | 2005-05-02 | ||
| DE102005038444A DE102005038444A1 (de) | 2005-05-02 | 2005-08-16 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| PCT/EP2006/060577 WO2006117259A1 (de) | 2005-05-02 | 2006-03-09 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1880100A1 true EP1880100A1 (de) | 2008-01-23 |
| EP1880100B1 EP1880100B1 (de) | 2017-06-07 |
Family
ID=36237973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06708697.5A Expired - Lifetime EP1880100B1 (de) | 2005-05-02 | 2006-03-09 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1880100B1 (de) |
| DE (1) | DE102005038444A1 (de) |
| WO (1) | WO2006117259A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU194380U1 (ru) * | 2019-08-19 | 2019-12-09 | Общество с ограниченной ответственностью Управляющая компания "Алтайский завод прецизионных изделий" | Топливная форсунка |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2120108A1 (de) * | 1971-04-24 | 1972-11-09 | LOrange KG, 7000 Stuttgart | Kraftstoffeinspritzdüse |
| JPS6326770U (de) * | 1986-08-04 | 1988-02-22 | ||
| JPH08189439A (ja) * | 1994-12-28 | 1996-07-23 | Zexel Corp | 電磁式燃料噴射弁およびそのノズルアッシィ組付け方法 |
| DE10024703A1 (de) | 2000-05-18 | 2001-11-22 | Bosch Gmbh Robert | Einspritzanordnung für ein Kraftstoff-Speichereinspritzsystem einer Verbrennungsmaschine |
| DE10149961A1 (de) * | 2001-10-10 | 2003-04-30 | Bosch Gmbh Robert | Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine |
| DE10245573A1 (de) * | 2002-09-27 | 2004-04-08 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| DE10260724A1 (de) * | 2002-12-23 | 2004-07-01 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| JP4029729B2 (ja) * | 2003-01-15 | 2008-01-09 | トヨタ自動車株式会社 | 燃料噴射弁 |
| DE20320869U1 (de) * | 2003-08-11 | 2005-05-19 | Siemens Ag | Einspritzventil mit Ventilhaltekörper mit optimierter Anlagefläche |
-
2005
- 2005-08-16 DE DE102005038444A patent/DE102005038444A1/de not_active Withdrawn
-
2006
- 2006-03-09 EP EP06708697.5A patent/EP1880100B1/de not_active Expired - Lifetime
- 2006-03-09 WO PCT/EP2006/060577 patent/WO2006117259A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006117259A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006117259A1 (de) | 2006-11-09 |
| EP1880100B1 (de) | 2017-06-07 |
| DE102005038444A1 (de) | 2006-11-09 |
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