EP3002447A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
EP3002447A1
EP3002447A1 EP15189295.7A EP15189295A EP3002447A1 EP 3002447 A1 EP3002447 A1 EP 3002447A1 EP 15189295 A EP15189295 A EP 15189295A EP 3002447 A1 EP3002447 A1 EP 3002447A1
Authority
EP
European Patent Office
Prior art keywords
component
face
injection device
fuel injection
clamping nut
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
Application number
EP15189295.7A
Other languages
German (de)
English (en)
Other versions
EP3002447B1 (fr
Inventor
Michael Kurrle
Jens-Peter Nagel
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
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3002447A1 publication Critical patent/EP3002447A1/fr
Application granted granted Critical
Publication of EP3002447B1 publication Critical patent/EP3002447B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/168—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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • 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
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the invention relates to a fuel injection device for injecting fuel into the combustion chamber of an internal combustion engine.
  • a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine which comprises a valve housing and a nozzle body, which are clamped by means of a clamping nut against each other.
  • a fixing pin or locking pin is arranged in facing blind holes of valve housing and nozzle body.
  • the allowable nominal pressure is increased by the maximum allowable torque - without causing a relative rotation of the components to be screwed - is increased for the clamping nut by increasing the coefficient of friction between the components to be screwed; the hold-down force of the assembly tool on the components to be screwed during tightening the nut need not be increased, but can even be lowered.
  • the invention is not limited to a fuel injector, but is generally suitable for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine.
  • the fuel injection device comprises a first component and a second component, which are screwed axially against each other by a clamping nut, wherein the clamping nut is in a threaded engagement with the first component, so that a first component formed on the first end face with a formed on the second component second End face is compressed.
  • At least the first end face is structured in such a way that no twisting of the first component and the second component occurs during tightening of the clamping nut.
  • the structuring increases the coefficient of friction, especially the static coefficient of friction, in contact of the first component with the second component, thereby increasing the maximum transferable tightening torque of the clamping nut - with a constant hold-down force on the first and second component - compared with an unstructured end face, without the first Rotate component and the second component against each other.
  • the structuring extends over the entire first end face.
  • the maximum torque transmission from the first component to the second component or vice versa is thereby distributed over the largest possible area; their increase due to the structuring is therefore particularly large.
  • the structuring extends over annular sector-shaped segments of the first end face.
  • the annular sector shaped segments are in the form of cake pieces with an optional centric one Bore, eg to guide a valve needle, in the "cake center". They are used particularly advantageously when high-pressure bores pass through the first end face.
  • the high-pressure bores are then sealed in contact of the first end face and the second end face via annular sector-shaped sealing surfaces.
  • the sealing surfaces are structured, so that both sealed over these surfaces and a large part of the tightening torque is transmitted.
  • the two functions of sealing and torque transmission are separated: the torque transmission takes place via the structured annular sector-shaped segments and the seal via the segments lying between them, which are also ring sector-shaped.
  • the torque transmission takes place via the structured annular sector-shaped segments and the seal via the segments lying between them, which are also ring sector-shaped.
  • three structured annular sector-shaped segments are formed alternately with three unstructured annular sector-shaped segments, wherein a segment is formed in each case over 60 ° of the end face.
  • the structuring extends over an annular segment of the first end face.
  • High-pressure bores which pass through the first end face can also be well sealed by this design: Analogously to the preceding embodiment, the high-pressure bores are either all in the structured annular segment or all in one or more unstructured annular segments of the first end face. In both embodiments, a particularly effective sealing edge can be formed at the boundary of the structured annular segment to an unstructured annular segment for sealing.
  • structured annular sector-shaped segments can be combined with structured annular segments, either additively as a union of all structured segments, or exclusively as an intersection of the structures of annular sector-shaped segments with annular segments.
  • the first face is structured by R ⁇ Z ⁇ 16 microns has an average surface roughness of 6 microns.
  • This average roughness R z is higher than the usual roughness values of the first end face and the second end face, thereby also the coefficient of friction between the first end face and the second end face being higher in comparison to unstructured end faces.
  • the first end face has grooves as a structure. These can be applied specifically with the processing methods grinding and turning targeted in a simple production machining.
  • the grooves may be both of a microscopic nature to increase the roughness and more macroscopic way to increase the waviness of the first end face. In both cases, the static coefficient of friction between the first end face and the second end face is increased. Ridges which increase the waviness on the first end face are particularly advantageous if corresponding grooves in the negative form are formed on the second end face and vice versa.
  • the grooves of the first and second end surfaces then engage with each other, resulting in a significant increase in the transmittable torque of the first component to second component result.
  • the laser-structuring and embossing processes can then be used particularly advantageously.
  • the grooves run in two different main directions, so that a cross-cut results.
  • the first end surface is heavily roughened, so that a comparatively large mean roughness R Z results, which is also almost independent of direction.
  • the coefficient of friction is almost independent of the direction of rotation or screwing.
  • the cross-cut is used in grooves R of the microscopic type, since a counter-grinding on the second face in negative form manufacturing technology is not implement.
  • the second end face is structured.
  • the averaged roughness depths R Z of the first end face and the second end face are comparatively high, whereby the coefficient of adhesion increases again compared to a tribological system with only one structured end face, since the roughness peaks of the opposite end faces interlock with one another in the case of two structured end faces .
  • the first end face is preferably and the second end face are each patterned negatively relative to each other so that the structures of the two end faces are in engagement with one another. As a result, a kind of positive engagement of the first component to the second component is formed for the torque transmission.
  • a locking pin is arranged as an additional anti-rotation between the first component and the second component. Especially with the use of microscopic structures, this can be necessary with extreme increase of the tightening torque of the clamping nut. This can be done a further increase in the sealed nominal pressures within the fuel injection device. Furthermore, it is entirely possible to dispense with a hold-down force on the first and second component in this embodiment.
  • the locking pin serves as an assembly aid for positioning of the first component and the second component; Of course, several locking pins can be used for this purpose.
  • the first component, the second component and the clamping nut have a substantially axially symmetrical shape.
  • the clamping nut is designed as a kind of union nut, a coaxial alignment of the first component to second component can be designed in a relatively simple form.
  • the clamping nut is applied to a shoulder of the second component and slides when tightening on this.
  • a direct power flow from the clamping nut to the first component and the second component is ensured.
  • the sliding of the clamping nut on the shoulder of the second component takes place to the same extent as the screwing into the thread of the first component, so that there is no relative rotation of the first component to second component.
  • the transmittable torque between the clamping nut and the second component must be smaller than the transmittable torque between the second component and the first component.
  • the surface of the shoulder which cooperates with the clamping nut, unstructured and has a small average surface roughness R Z as the first end face and / or the second end face.
  • a coating can be applied to the shoulder, which has a low sliding friction result.
  • a third component is arranged on the second component opposite the first component.
  • a third end face formed on the third component is pressed together with a further end face formed on the second component, wherein the clamping nut rests against a shoulder of the third component and slides on it when tightened.
  • three components, namely the first, the second and the third component are pressed together by the clamping nut.
  • such an embodiment is used to more advantageously arrange functions of the fuel injector in the additional third component or to integrate additional functions for the fuel injector.
  • the third end face and / or the further end face are structured. This results in an increase in the torque transfer torque-proof both between the first and second as well as between the second and third component.
  • the structuring by sputtering, embossing, etching, sandblasting or laser structuring is applied.
  • preferably microscopic structures are applied by the surface treatments sputtering, etching or sandblasting and macroscopic structuring by the surface treatment processes embossing or laser structuring.
  • the fuel injection device is a fuel injector.
  • a fuel injector an increase in the permissible torque of a clamping nut without simultaneous rotation of the braced components is required because for future applications, the sealed pressures of the fuel within the fuel injector continue to rise.
  • Fig.1 shows a fuel injection device 100 for injecting fuel into the combustion chamber of an internal combustion engine, wherein only the essential parts for the present invention are shown.
  • the fuel injection device 100 may be, for example, a fuel injector, as used in a common rail system.
  • the fuel injection device 100 comprises a first component 1 and a second component 2, which are screwed against one another with a clamping nut 5, so that a first end surface 1a formed on the first component 1 is pressed with a second end surface 2a formed on the second component 2.
  • the clamping nut 5 is in threaded engagement with a thread formed on the first component 1 and abuts against a shoulder 2s of the second component 2. When tightening the nut 5, this slides on the shoulder from 2s.
  • the first component 1 and the second component 2 are to be screwed tightly against each other by the clamping nut 5. During the tightening process twisting of the two components 1, 2 against each other should be prevented. This is done with a pressure force by the clamping nut 5 and / or an external hold down force of a mounting tool on the two components 1, 2.
  • An increase in the transmittable torque between the two components 1, 2 - and thus a higher security against rotation - is increased by an increase the coefficient of friction of the first end face 1a and / or the second end face 2a, or also achieved by positive closures between the first end face 1a and the second end face 2a.
  • the coefficient of friction between them increases such that the transmittable transverse force or the transmittable torque is increased in such a way that a rotation of the first component 1 and the second component 2 during the tightening of the clamping nut 5 is prevented.
  • either the hold-down force can be reduced by a hold-down device, not shown on the first component 1 and second component 2 during tightening of the clamping nut 5 or the tightening torque of the clamping nut 5 can be increased at a constant hold-down force.
  • First component 1 and second component 2 may be, for example, components of a fuel injector, such as injector body and nozzle body.
  • the second component 2 has injection openings 20.
  • other components such as a valve plate or a throttle plate, are screwed on the clamping nut 5, so that there are additional contact surfaces, which also have structuring, so that there is a rotation of the components against each other prevented;
  • such an embodiment is in Figure 5 described in more detail.
  • Fig.2 shows the section AA the Fig.1 , That is, the contact plane from the first end face 1a to the second end face 2a in one embodiment. Shown are the first component 1 and the clamping nut 5.
  • the first component 1 has an exemplary bore 1c, which also cuts through the first end face 1a, as used for example for performing a valve needle.
  • Fig.2 Structuring shown extends over the entire first end face 1a.
  • the structuring can thus be done comparatively simply by a surface treatment which does not require the removal of individual parts of the first end face 1a.
  • the second end face 2 a may also be structured instead of or in addition to the first end face 1 a.
  • Figure 3 shows the section AA the Fig.1 a further embodiment.
  • the first end face 1a is cut through by two bores 1c and 1d, wherein the first bore 1c is arranged centrally.
  • the first end face 1a is divided from outside to inside into three annular segments 1n1, 1r and 1n2, wherein the outer segment 1n1 and the inner segment 1n2 are not structured while the central annular segment 1r is structured.
  • the structured annular segment 1r can either be a sealing surface of the first component 1 to the second component 2, or else a surface which adjoins an unstructured sealing surface; in the second case would be the sealing surface then either the outer segment 1n1 or the inner segment 1n2, in which case, of course, the holes 1c and 1d must be such that they are sealed over the sealing surface in the sectional plane AA.
  • a particularly effective sealing edge can be formed at the boundary of the structured annular segment 1r to form an unstructured annular segment, ie either 1n1 or 1n2. This is achieved, for example, in that the first end face 1a is not made planar but convex, or in that the structured annular segment 1r has a very small angle (approx. 1n) to the unstructured annular segment adjacent to it, ie 1n1 and / or 1n2. 0.5 °).
  • Figure 4 shows the section AA the Fig.1 a further embodiment.
  • the first end face 1a of three holes 1c, 1d and 1e passes through, wherein the first bore 1c is arranged centrally.
  • the first end face 1a is not divided into annular segments, but in segments of an annular sector, that is, in cake-segment-shaped segments which meet in the central bore 1c.
  • three annular sector-shaped segments 1k are structured and three further annular sector-shaped segments 1n are not structured, wherein circumferentially one structured segment 1k follows an unstructured segment 1n and the segments each comprise 60 °.
  • segmentations are conceivable that include a different number of segments and / or other segment angle.
  • Figure 7 shows a section of a structured end face, as for example in the Fig.2 and the Figure 6 is marked.
  • the structuring consists of individual grooves R, as they are applied for example in the surface treatment via a grinding process.
  • the grooves R are roughly in two different main directions R1 and R2, which are largely perpendicular to each other, so that there is essentially a kind of cross-section as a structure.
  • Figure 8a schematically shows a section of another embodiment of the fuel injection device according to the invention, in which the first component 1 with the second component 2; 2 'is braced, wherein the clamping nut is not shown.
  • the feather key elevations 2p act; 2p 'like many small feather keys and are therefore particularly well suited for torque transmission.
  • the tolerance of the assembly is negatively influenced with respect to parallelism, but at smaller heights than 25 ⁇ m, the effect of the positive connection is too low.
  • FIG. 8B shows the section CC the Figure 8a , ie a plan view of the second end face 2a; 2a 'of the second component 2; 2 'in one embodiment.
  • the second component has three holes 2c; 2c ', 2d; 2d 'and 2e; 2e ', which are sketched by way of example as pressure-loaded bores or guide bores.
  • the keyway elevations 2p; 2p ' are advantageously arranged so that they also serve as an assembly aid.
  • the surface processing methods embossing and laser structuring are suitable for applying to the two end faces 1a and 2a; 2a 'receiving grooves 1p and keyway elevations 2p; 2p 'apply.
  • the tolerances should be chosen so that the side surfaces of grooves 1p and keyways 2p; 2p 'get in good contact with each other, so are relatively tight tolerated.
  • In the axial direction of the components is a contact between receiving grooves 1p and keyholes 2p; 2p 'be avoided, so that the axial biasing force between the first component 1 and second component 2; 2 'on the two end faces 1a and 2a; 2a 'outside the receiving grooves 1p and keyway elevations 2p; 2p 'works.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP15189295.7A 2014-02-18 2015-01-07 Dispositif d'injection de carburant Active EP3002447B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014202938.4A DE102014202938B4 (de) 2014-02-18 2014-02-18 Kraftstoffeinspritzvorrichtung
EP15150244.0A EP2921690B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP15150244.0A Division EP2921690B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant
EP15150244.0A Division-Into EP2921690B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP3002447A1 true EP3002447A1 (fr) 2016-04-06
EP3002447B1 EP3002447B1 (fr) 2017-10-18

Family

ID=52302123

Family Applications (3)

Application Number Title Priority Date Filing Date
EP15189295.7A Active EP3002447B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant
EP15189313.8A Active EP3002448B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant
EP15150244.0A Active EP2921690B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP15189313.8A Active EP3002448B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant
EP15150244.0A Active EP2921690B1 (fr) 2014-02-18 2015-01-07 Dispositif d'injection de carburant

Country Status (2)

Country Link
EP (3) EP3002447B1 (fr)
DE (1) DE102014202938B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015216791A1 (de) * 2015-09-02 2017-03-02 Robert Bosch Gmbh Kraftstoffinjektor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236887A2 (fr) * 2001-02-14 2002-09-04 Denso Corporation Buse d'injection de combustible avec un élément pour réduire les forces de frottement se produisant durant l'assemblage
DE102005012682A1 (de) * 2004-03-19 2005-10-13 Denso Corp., Kariya Kraftstoffeinspritzdüse für einen Verbrennungsmotor
EP1820957A2 (fr) * 2006-02-20 2007-08-22 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
EP2187042A1 (fr) * 2008-11-14 2010-05-19 Robert Bosch GmbH Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit
DE102011078353A1 (de) 2011-06-29 2013-01-03 Robert Bosch Gmbh Kraftstoffinjektor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005061408A1 (de) * 2005-12-22 2007-06-28 Robert Bosch Gmbh Kunststoff-Metall-Verbindung und Brennstoffeinspritzventil mit einer Kraftstoff-Metall-Verbindung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236887A2 (fr) * 2001-02-14 2002-09-04 Denso Corporation Buse d'injection de combustible avec un élément pour réduire les forces de frottement se produisant durant l'assemblage
DE102005012682A1 (de) * 2004-03-19 2005-10-13 Denso Corp., Kariya Kraftstoffeinspritzdüse für einen Verbrennungsmotor
EP1820957A2 (fr) * 2006-02-20 2007-08-22 Robert Bosch Gmbh Injecteur de carburant pour moteurs à combustion interne
EP2187042A1 (fr) * 2008-11-14 2010-05-19 Robert Bosch GmbH Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit
DE102011078353A1 (de) 2011-06-29 2013-01-03 Robert Bosch Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
EP3002448B1 (fr) 2017-10-18
EP3002448A1 (fr) 2016-04-06
DE102014202938B4 (de) 2015-12-03
EP2921690A1 (fr) 2015-09-23
DE102014202938A1 (de) 2015-08-20
EP2921690B1 (fr) 2017-10-18
EP3002447B1 (fr) 2017-10-18

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