EP3798441A1 - High pressure fuel pump - Google Patents
High pressure fuel pump Download PDFInfo
- Publication number
- EP3798441A1 EP3798441A1 EP20193577.2A EP20193577A EP3798441A1 EP 3798441 A1 EP3798441 A1 EP 3798441A1 EP 20193577 A EP20193577 A EP 20193577A EP 3798441 A1 EP3798441 A1 EP 3798441A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact surface
- pressure fuel
- fuel pump
- fastening
- hole
- 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 37
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 230000000295 complement effect Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Classifications
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- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/48—Assembling; Disassembling; Replacing
Definitions
- the invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the preamble of claim 1.
- the DE 10 2008 042 626 A1 discloses a high-pressure fuel pump with a fastening flange which has two diametrically opposed tab-like or wing-like fastening sections, in each of which there is a through hole for a fastening screw to pass through.
- the high-pressure fuel pump can be attached to an engine block of an internal combustion engine.
- material is displaced on the outer edge of a fastening section by a punching process, whereby a first contact surface for contacting the engine block is provided on a first side and a second contact surface for contacting a screw head is provided on a second side of the fastening flange.
- the high-pressure fuel pump can also be fastened to those engine blocks on which only a small surface is available for fastening the fastening flange.
- the first contact surface which is provided for contacting and supporting the fastening flange on the engine block, can be moved closer than before to the through hole, which is used to pass the fastening screw.
- care can be taken to leave a certain, small gap between the Through hole and the first contact surface remains so that the through hole is not damaged by the material displacement and the fastening screw remains straight after tightening.
- the interruption or recess section is provided on the first side, which leads to the formation of an additional section of the second contact surface that is complementary to the interruption or recess section on the second side (It goes without saying that here and below the term "screw head" also includes a possible washer or the like).
- a high-pressure fuel pump with a fastening flange for fastening the high-pressure fuel pump to an engine block of an internal combustion engine is proposed.
- the fastening flange is usually a flat, plate-like part with two wing-like fastening sections arranged diametrically opposite one another.
- the fastening flange has at least one through hole (preferably two through holes, namely one in each fastening section) for passing a fastening screw through in each case.
- the generally flat plate-like fastening flange In the installed position, has a first side pointing towards the engine block and a second side pointing away from the engine block in the installed position.
- a slightly protruding first contact surface is formed on the first side of the fastening flange, which is used for defined contact with and support on the engine block.
- a second contact surface that is complementary to this in regions is also formed on the second side, which serves for contacting a screw head of the fastening screw so that the screw head is supported on the fastening flange.
- the first contact surface is seen in the circumferential direction around the through hole through at least one interruption or recess section interrupted or left out.
- this interruption or recess section no (this also includes only a comparatively small) material displacement has taken place.
- the interruption or recess section with no or only slight material displacement is at least partially surrounded by a section in which the said (greater) material displacement has taken place.
- the at least one interruption or recess section referred to here is not present in the area of the fastening flange facing a housing of the high pressure fuel pump, as seen from the through hole, but in an outer area, seen from the through hole, rather remote from the housing of the high pressure fuel pump Viewed in the circumferential direction, a maximum sector extending over approximately 270 ° around the through hole. This forms an additional section of the second contact surface on the second side, on which the screw head of the fastening screw can be supported.
- the first contact surface is essentially immediately adjacent to the through hole, at least in regions. This enables the high-pressure fuel pump to be attached to a very small engine block.
- “essentially” means that just such a large distance can remain between the first contact surface and the edge of the through hole that the through hole is not deformed when the material is displaced.
- the additional section of the second contact surface be immediately adjacent to the through hole, at least in some areas. This ensures reliable support for the screw head, in particular also when the screw head has a comparatively small diameter.
- the first contact surface has a first edge region and a second edge region towards the through hole, the first edge region being closer to the through hole than the second edge region. This is the case that corresponds more to a recess section than to an interruption section.
- At least one interruption or recess section lie on a longitudinal axis of the fastening flange.
- the fastening flange usually has an elongated shape by which a longitudinal axis is defined, with two fastening sections protruding in the manner of a wing or tab, each with a through hole. Because the interruption or recess section lies on this longitudinal axis, a symmetrical configuration of the first contact surface and the second contact surface is made possible. This measure prevents the fastening flange from twisting when it is fastened to the engine block (i.e. when the fastening screws are tightened) and the high-pressure fuel pump is not misaligned as a result.
- the first contact surface is delimited radially outward from the edge of the fastening flange. This has the effect of maximizing the first contact area, since the first contact area extends all the way to the outer edge of the fastening flange.
- the material displacement is at least also brought about by a punching process.
- a punching process can be carried out with high precision and at low cost.
- a high pressure fuel pump carries in Figure 1 generally the reference numeral 10. It comprises a pump housing 12 with a polygonal cross section and overall approximately rotationally symmetrical.
- the high-pressure fuel pump 10 is a so-called “plug-in pump”. She will be with an in Figure 1 lower region 14 inserted into an opening in a cylinder head of an engine block of an internal combustion engine (not shown).
- the lower region 14 includes, inter alia, a piston 16 and a piston spring 18.
- the piston 16 is set in a reciprocating motion by an eccentric section of an eccentric shaft or a cam section of a camshaft.
- a fastening flange 20 is used to fasten the high-pressure fuel pump 10 to the engine block of the internal combustion engine and will be discussed in greater detail below.
- the high-pressure fuel pump 10 comprises an inlet 22 and an outlet 24.
- the inlet 22 is connected to a fuel line (not shown) via which the high-pressure fuel pump 10 receives precompressed fuel.
- the outlet 24 of the high-pressure fuel pump 10 is connected to a high-pressure fuel reservoir (not shown), which is usually also referred to as a “rail”.
- Several injectors are in turn connected to these, which inject the fuel directly into the combustion chambers of the internal combustion engine. Both petrol and diesel can be used as fuel.
- the mounting flange 20 is shown in greater detail in FIGS Figures 2 and 3 drawn.
- the mounting flange 20 has an overall oval-appearing shape of an elongated diamond with rounded corners and a longitudinal axis 26.
- a central area 28 is defined from which two diametrically opposed and protruding wing-like mounting sections 30a and 30b are defined extend.
- the middle area 28 is penetrated by a central fastening opening 32, which is designed in a step-like manner.
- the pump housing 12 is inserted into this fastening opening 32. An area of contact between the The fastening opening 32 and the pump housing 12 are welded, as a result of which the fastening flange 20 is rigidly and integrally connected to the pump housing 12.
- Each fastening section 30a and 30b has a through hole 34a and 34b lying on the longitudinal axis 26.
- the fastening sections 30a and 30b are identical and constructed and configured symmetrically to one another. For the sake of simplicity, only the fastening section 30a will be discussed below.
- the fastening flange 20 is designed as an overall flat and overall essentially flat plate-like part which has a thickness D.
- the Figure 2 shows the mounting flange from the side that points towards the engine block in the installation position. This page is referred to as the "first page” and bears the reference numeral 36.
- the Figure 3 shows the mounting flange 20 from the side that is facing away from the engine block in the installed position. This side is referred to as the “second side” and bears the reference number 38.
- the fastening section 30a of the fastening flange 20 has on the first side 36 a first contact surface 40 for contacting the engine block, which is formed by a material displacement, for example a stamping process or an embossing process.
- the fastening section 30a of the fastening flange 20 has a second contact surface 42 which is complementary to the first contact surface 40 and also formed by the displacement of material and which is used for contacting a screw head 44 (or an associated washer) of a fastening screw 46.
- the first contact surface 40 viewed in the circumferential direction around the through hole 34a, is interrupted by at least one interruption section 48 in which no or at least a substantial material displacement has taken place.
- an additional section 50 of the second contact surface 42 is formed on the second side 38, on which the screw head 44 of the fastening screw 46 can be supported.
- the first contact surface 40 in the circumferential direction around the Through hole 34a seen, divided into two annular segment-shaped segments or sectors 40a and 40b.
- the interruption section 48 is not present in a region 52 of the fastening flange 20 facing the pump housing 12 of the high-pressure fuel pump 10, but in an outer region 52 of the fastening flange 20, seen from the through hole 34a, from the fastening opening 32 and from
- the pump housing 12 of the high-pressure fuel pump 10 is more remote and, viewed in the circumferential direction, extends over approximately 220 ° (maximum approximately 270 °) around the through hole 34a.
- the first contact surface 40 is delimited radially outward from the edge (without reference number) of the fastening flange 20.
- FIG 4 a modified embodiment of a fastening flange 20 is shown. This differs from that of the Figures 1-3 in that, instead of an interruption section, only a recess section 54 is provided, through which the first contact surface 40 is not divided into two separate segments or sectors 40a and 40b. Rather, the two sectors 40a and 40b remain connected to one another by a radially outer web 56.
- the first contact surface 40 has a first edge region 58 and a second edge region 60 towards the through hole 34a, the first edge region 58 being closer to the through hole 34a than the second edge region 60 Screw head 44 of the fastening screw 46 provides a sufficiently large second contact surface 42.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Eine Kraftstoff-Hochdruckpumpe (10) umfasst einen Befestigungsflansch (20) zur Befestigung der Kraftstoff-Hochdruckpumpe (10) an einem Motorblock einer Brennkraftmaschine mit mindestens einem Durchgangsloch (34) zum Hindurchführen einer Befestigungsschraube (46) und mit einer in Einbaulage zum Motorblock hin weisenden ersten Seite (36) und einer in Einbaulage vom Motorblock weg weisenden zweiten Seite (38), wobei der Befestigungsflansch (20) auf der ersten Seite (36) eine durch eine Materialverlagerung gebildete erste Kontaktfläche (40) zur Kontaktierung mit dem Motorblock und auf der zweiten Seite (38) eine hierzu bereichsweise komplementäre zweite Kontaktfläche (42) zur Kontaktierung mit einem Schraubenkopf (44) der Befestigungsschraube (46) aufweist. Es wird vorgeschlagen, dass die erste Kontaktfläche (40) in Umfangsrichtung um das Durchgangsloch (34) herum gesehen durch mindestens einen Unterbrechungs- oder Aussparungsabschnitt (48, 54) unterbrochen oder ausgespart ist, in dem keine Materialverlagerung stattgefunden hat, wodurch auf der zweiten Seite (38) ein zusätzlicher Abschnitt (50) der zweiten Kontaktfläche (42) gebildet ist.A high-pressure fuel pump (10) comprises a fastening flange (20) for fastening the high-pressure fuel pump (10) to an engine block of an internal combustion engine, with at least one through hole (34) for passing through a fastening screw (46) and with one pointing towards the engine block in the installed position first side (36) and a second side (38) pointing away from the engine block in the installed position, the fastening flange (20) on the first side (36) having a first contact surface (40) formed by a material shift for contacting with the engine block and on the second side (38) has a second contact surface (42) complementary thereto in some areas for contacting with a screw head (44) of the fastening screw (46). It is proposed that the first contact surface (40), seen in the circumferential direction around the through hole (34), is interrupted or recessed by at least one interruption or recess section (48, 54) in which no material displacement has taken place, whereby on the second side (38) an additional section (50) of the second contact surface (42) is formed.
Description
Die Erfindung betrifft eine Kraftstoff-Hochdruckpumpe für ein Kraftstoff-Einspritzsystem einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the preamble of claim 1.
Die
Das der Erfindung zu Grunde liegende Problem wird durch eine Kraftstoff-Hochdruckpumpe mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.The problem on which the invention is based is solved by a high-pressure fuel pump having the features of claim 1. Advantageous further developments of the invention are specified in the subclaims.
Durch die Erfindung kann die Kraftstoff-Hochdruckpumpe auch an solchen Motorblöcken befestigt werden, an denen nur eine kleine Oberfläche für die Befestigung des Befestigungsflansches zur Verfügung steht. Bei solchen Motorblöcken steht nämlich oft nur eine vergleichsweise geringe Aufstandsfläche für den Befestigungsflansch zur Verfügung. Durch die erfindungsgemäße Maßnahme kann die erste Kontaktfläche, die für die Kontaktierung mit und die Abstützung des Befestigungsflansches an dem Motorblock vorgesehen ist, näher als bisher an das Durchgangsloch, welches zum Hindurchführen der Befestigungsschraube dient, herangerückt werden. Dabei kann jedoch darauf geachtet werden, dass noch ein gewisser, geringer Spalt zwischen dem Durchgangsloch und der ersten Kontaktfläche verbleibt, damit das Durchgangsloch durch die Materialverlagerung nicht beschädigt wird und die Befestigungsschraube nach dem Anziehen gerade bleibt.As a result of the invention, the high-pressure fuel pump can also be fastened to those engine blocks on which only a small surface is available for fastening the fastening flange. In such engine blocks, there is often only a comparatively small contact area available for the fastening flange. As a result of the measure according to the invention, the first contact surface, which is provided for contacting and supporting the fastening flange on the engine block, can be moved closer than before to the through hole, which is used to pass the fastening screw. However, care can be taken to leave a certain, small gap between the Through hole and the first contact surface remains so that the through hole is not damaged by the material displacement and the fastening screw remains straight after tightening.
Indem die erste Kontaktfläche nach radial einwärts näher als bisher an das Durchgangsloch herangeführt werden kann, würde, ohne Gegenmaßnahmen, die auf der entgegengesetzten zweiten Seite für die Lagerung und Abstützung des Schraubenkopfes erforderliche zweite Kontaktfläche entsprechend kleiner werden. Damit dennoch auf der zweiten Seite des Befestigungsflansches eine ausreichend große zweite Kontaktfläche für den Schraubenkopf verbleibt, ist auf der ersten Seite der Unterbrechungs- oder Aussparungsabschnitt vorgesehen, der auf der zweiten Seite zur Bildung eines zum Unterbrechungs- oder Aussparungsabschnitt komplementären zusätzlichen Abschnittes der zweiten Kontaktfläche führt (es versteht sich, dass hier und nachfolgend der Begriff "Schraubenkopf" auch eine eventuelle Unterlegscheibe o.ä. beinhaltet).Since the first contact surface can be brought radially inward closer than before to the through hole, the second contact surface required on the opposite second side for mounting and supporting the screw head would become correspondingly smaller without countermeasures. So that a sufficiently large second contact surface for the screw head still remains on the second side of the fastening flange, the interruption or recess section is provided on the first side, which leads to the formation of an additional section of the second contact surface that is complementary to the interruption or recess section on the second side (It goes without saying that here and below the term "screw head" also includes a possible washer or the like).
Konkret wird eine Kraftstoff-Hochdruckpumpe mit einem Befestigungsflansch zur Befestigung der Kraftstoff-Hochdruckpumpe an einem Motorblock einer Brennkraftmaschine vorgeschlagen. Bei dem Befestigungsflansch handelt es sich üblicherweise um ein flaches, plattenartiges Teil mit zwei diametral entgegengesetzt angeordneten flügelartigen Befestigungsabschnitten. Der Befestigungsflansch hat mindestens ein Durchgangsloch (vorzugsweise zwei Durchgangslöcher, nämlich eines in jedem Befestigungsabschnitt) zum Hindurchführen jeweils einer Befestigungsschraube. In Einbaulage hat der insgesamt flache plattenartige Befestigungsflansch eine zum Motorblock hin weisende erste Seite sowie eine in Einbaulage vom Motorblock weg weisende zweite Seite.Specifically, a high-pressure fuel pump with a fastening flange for fastening the high-pressure fuel pump to an engine block of an internal combustion engine is proposed. The fastening flange is usually a flat, plate-like part with two wing-like fastening sections arranged diametrically opposite one another. The fastening flange has at least one through hole (preferably two through holes, namely one in each fastening section) for passing a fastening screw through in each case. In the installed position, the generally flat plate-like fastening flange has a first side pointing towards the engine block and a second side pointing away from the engine block in the installed position.
Durch eine Materialverlagerung in einer Richtung senkrecht zu einer Ebene des Befestigungsflansches wird auf der ersten Seite des Befestigungsflansches eine geringfügig abragende erste Kontaktfläche gebildet, die zur definierten Kontaktierung mit und Abstützung an dem Motorblock dient. Durch diese Materialverlagerung wird ferner auf der zweiten Seite eine hierzu bereichsweise komplementäre zweite Kontaktfläche gebildet, die zur Kontaktierung mit einem Schraubenkopf der Befestigungsschraube dient, so dass der Schraubenkopf am Befestigungsflansch abgestützt wird.By shifting material in a direction perpendicular to a plane of the fastening flange, a slightly protruding first contact surface is formed on the first side of the fastening flange, which is used for defined contact with and support on the engine block. As a result of this material displacement, a second contact surface that is complementary to this in regions is also formed on the second side, which serves for contacting a screw head of the fastening screw so that the screw head is supported on the fastening flange.
Die erste Kontaktfläche ist in Umfangsrichtung um das Durchgangsloch herum gesehen durch mindestens einen Unterbrechungs- oder Aussparungsabschnitt unterbrochen oder ausgespart. In diesem Unterbrechungs- oder Aussparungsabschnitt hat also keine (dies beinhaltet auch eine vergleichsweise nur geringe) Materialverlagerung stattgefunden. Anders ausgedrückt: der Unterbrechungs- oder Aussparungsabschnitt ohne oder nur mit geringer Materialverlagerung ist zumindest bereichsweise von einem Abschnitt umgeben, in dem die besagte (stärkere) Materialverlagerung stattgefunden hat.The first contact surface is seen in the circumferential direction around the through hole through at least one interruption or recess section interrupted or left out. In this interruption or recess section, no (this also includes only a comparatively small) material displacement has taken place. In other words: the interruption or recess section with no or only slight material displacement is at least partially surrounded by a section in which the said (greater) material displacement has taken place.
Der hier gemeinte mindestens eine Unterbrechungs- oder Aussparungsabschnitt ist, vom Durchgangsloch ausgesehen, nicht in dem zu einem Gehäuse der Kraftstoff-Hochdruckpumpe weisenden Bereich des Befestigungsflansches vorhanden, sondern in einem vom Durchgangsloch aus gesehen äußeren, vom Gehäuse der Kraftstoff-Hochdruckpumpe eher fernliegenden und sich in Umfangsrichtung gesehen maximal etwa über 270° um das Durchgangsloch herum erstreckenden Sektor. Hierdurch wird auf der zweiten Seite ein zusätzlicher Abschnitt der zweiten Kontaktfläche gebildet, an dem sich der Schraubenkopf der Befestigungsschraube abstützen kann.The at least one interruption or recess section referred to here is not present in the area of the fastening flange facing a housing of the high pressure fuel pump, as seen from the through hole, but in an outer area, seen from the through hole, rather remote from the housing of the high pressure fuel pump Viewed in the circumferential direction, a maximum sector extending over approximately 270 ° around the through hole. This forms an additional section of the second contact surface on the second side, on which the screw head of the fastening screw can be supported.
Bei einer Weiterbildung wird vorgeschlagen, dass die erste Kontaktfläche mindestens bereichsweise zu dem Durchgangsloch im Wesentlichen unmittelbar benachbart ist. Hierdurch wird die Befestigung der Kraftstoff-Hochdruckpumpe auch an einem sehr kleinen Motorblock ermöglicht. Hierbei bedeutet "im wesentlichen", dass gerade noch ein so großer Abstand zwischen der ersten Kontaktfläche und dem Rand des Durchgangslochs verbleiben kann, dass das Durchgangsloch bei der Materialverlagerung nicht verformt wird.In a further development, it is proposed that the first contact surface is essentially immediately adjacent to the through hole, at least in regions. This enables the high-pressure fuel pump to be attached to a very small engine block. In this context, “essentially” means that just such a large distance can remain between the first contact surface and the edge of the through hole that the through hole is not deformed when the material is displaced.
Bei einer Weiterbildung wird vorgeschlagen, dass der zusätzliche Abschnitt der zweiten Kontaktfläche mindestens bereichsweise zu dem Durchgangsloch unmittelbar benachbart ist. Dies sorgt für eine zuverlässige Abstützung des Schraubenkopfes, insbesondere auch dann, wenn der Schraubenkopf einen vergleichsweise kleinen Durchmesser aufweist.In a further development, it is proposed that the additional section of the second contact surface be immediately adjacent to the through hole, at least in some areas. This ensures reliable support for the screw head, in particular also when the screw head has a comparatively small diameter.
Bei einer Weiterbildung wird vorgeschlagen, dass die erste Kontaktfläche zum Durchgangsloch hin einen ersten Randbereich und einen zweiten Randbereich aufweist, wobei der erste Randbereich näher zum Durchgangsloch liegt als der zweite Randbereich. Dies ist also jener Fall, der eher einem Aussparungsabschnitt als einem Unterbrechungsabschnitt entspricht. Durch einen solchen Aussparungsabschnitt wird, vom Durchgangsloch aus gesehen, ein entfernt liegender Bereich als erster Kontaktabschnitt zur Kontaktierung zwischen Befestigungsflansch und Motorblock geschaffen, und dennoch bleibt unmittelbar benachbart zum Durchgangsloch ein zweiter Kontaktabschnitt erhalten, an dem sich der Schraubenkopf der Befestigungsschraube abstützen kann.In a further development, it is proposed that the first contact surface has a first edge region and a second edge region towards the through hole, the first edge region being closer to the through hole than the second edge region. This is the case that corresponds more to a recess section than to an interruption section. By means of such a recess section, as seen from the through hole, a remote area is used as a first contact section for contacting between Mounting flange and engine block created, and yet a second contact section is retained immediately adjacent to the through hole, on which the screw head of the mounting screw can be supported.
Bei einer Weiterbildung wird vorgeschlagen, dass mindestens ein Unterbrechungs- oder Aussparungsabschnitt auf einer Längsachse des Befestigungsflansches liegt. Dem liegt die Überlegung zugrunde, dass der Befestigungsflansch üblicherweise eine längliche Form hat, durch die eine Längsachse definiert wird, mit zwei flügel- oder laschenartig abragenden Befestigungsabschnitten mit jeweils einem Durchgangsloch. Indem der Unterbrechungs- oder Aussparungsabschnitt auf dieser Längsachse liegt, wird eine symmetrische Ausgestaltung der ersten Kontaktfläche und der zweiten Kontaktfläche ermöglicht. Ein Verwinden des Befestigungsflansches bei der Befestigung am Motorblock (also dem Anziehen der Befestigungsschrauben) und eine hierdurch verursachte Schiefstellung der Kraftstoff-Hochdruckpumpe wird durch diese Maßnahme vermieden.In a further development, it is proposed that at least one interruption or recess section lie on a longitudinal axis of the fastening flange. This is based on the consideration that the fastening flange usually has an elongated shape by which a longitudinal axis is defined, with two fastening sections protruding in the manner of a wing or tab, each with a through hole. Because the interruption or recess section lies on this longitudinal axis, a symmetrical configuration of the first contact surface and the second contact surface is made possible. This measure prevents the fastening flange from twisting when it is fastened to the engine block (i.e. when the fastening screws are tightened) and the high-pressure fuel pump is not misaligned as a result.
Bei einer Weiterbildung wird vorgeschlagen, dass die erste Kontaktfläche nach radial außen vom Rand des Befestigungsflansches begrenzt wird. Dies bewirkt eine Maximierung der ersten Kontaktfläche, da die erste Kontaktfläche bis ganz an den äußeren Rand des Befestigungsflansches reicht.In a further development, it is proposed that the first contact surface is delimited radially outward from the edge of the fastening flange. This has the effect of maximizing the first contact area, since the first contact area extends all the way to the outer edge of the fastening flange.
Bei einer Weiterbildung wird vorgeschlagen, dass die Materialverlagerung mindestens auch durch einen Stanzvorgang herbeigeführt ist. Ein solcher Stanzvorgang ist mit hoher Präzision und zu geringen Kosten durchführbar.In a further development, it is proposed that the material displacement is at least also brought about by a punching process. Such a punching process can be carried out with high precision and at low cost.
Nachfolgend werden Ausführungsformen der Erfindung unter Bezugnahme auf die beigefügte Zeichnung erläutert. In der Zeichnung zeigen:
- Figur 1
- eine perspektivische Darstellung einer Kraftstoff-Hochdruckpumpe mit einer ersten Ausführungsform eines Befestigungsflansches;
- Figur 2
- eine perspektivische Darstellung von seitlich unten des Befestigungsflansches von
Figur 1 ; - Figur 3
- eine perspektivische Darstellung von seitlich oben des Befestigungsflansches von
Figur 1 ; und - Figur 4
- eine perspektivische Darstellung von seitlich unten einer zweiten Ausführungsform eines Befestigungsflansches.
- Figure 1
- a perspective view of a high-pressure fuel pump with a first embodiment of a fastening flange;
- Figure 2
- a perspective view from the side below of the mounting flange of FIG
Figure 1 ; - Figure 3
- a perspective view from the side above of the mounting flange of
Figure 1 ; and - Figure 4
- a perspective illustration from the side below of a second embodiment of a fastening flange.
Funktionsäquivalente Elemente und Bereiche tragen nachfolgend in unterschiedlichen Ausführungsformen die gleichen Bezugszeichen.Functionally equivalent elements and areas in the following have the same reference symbols in different embodiments.
Eine Kraftstoff-Hochdruckpumpe trägt in
Die Kraftstoff-Hochdruckpumpe 10 umfasst einen Einlass 22 und einen Auslass 24. Im Betrieb ist der Einlass 22 mit einer Kraftstoffleitung (nicht dargestellt) verbunden, über die die Kraftstoff-Hochdruckpumpe 10 vorverdichteten Kraftstoff erhält. Der Auslass 24 der Kraftstoff-Hochdruckpumpe 10 ist mit einem Hochdruck-Kraftstoffspeicher (nicht dargestellt) verbunden, der üblicherweise auch als "Rail" bezeichnet wird. An diesen sind wiederum mehrere Injektoren angeschlossen, die den Kraftstoff direkt in Brennräume der Brennkraftmaschine einspritzen. Als Kraftstoff kommt sowohl Benzin als auch Diesel infrage.The high-
Der Befestigungsflansch 20 ist stärker im Detail in den
Jeder Befestigungsabschnitt 30a und 30b weist ein auf der Längsachse 26 liegendes Durchgangsloch 34a und 34b auf. Die Befestigungsabschnitte 30a und 30b sind identisch und zueinander symmetrisch aufgebaut und ausgestaltet. Der Einfachheit halber wird nachfolgend nur noch auf den Befestigungsabschnitt 30a eingegangen.Each
Der Befestigungsflansch 20 ist als insgesamt flaches und insgesamt im wesentlichen ebenes plattenartiges Teil ausgebildet, welches eine Dicke D aufweist. Die
Der Befestigungsabschnitt 30a des Befestigungsflansches 20 weist auf der ersten Seite 36 eine durch eine Materialverlagerung, beispielsweise einen Stanzvorgang oder einen Prägevorgang, gebildete erste Kontaktfläche 40 zur Kontaktierung mit dem Motorblock auf. Auf der zweiten Seite 38 weist der der Befestigungsabschnitt 30a des Befestigungsflansches 20 eine zu der ersten Kontaktfläche 40 komplementäre und ebenfalls durch die Materialverlagerung gebildete zweite Kontaktfläche 42 auf, die zur Kontaktierung mit einem Schraubenkopf 44 (bzw. einer zugehörigen Unterlegscheibe) einer Befestigungsschraube 46 dient.The
Man erkennt aus
Man erkennt aus den
Aus
In
Claims (7)
Applications Claiming Priority (1)
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---|---|---|---|
DE102019214661.9A DE102019214661A1 (en) | 2019-09-25 | 2019-09-25 | High pressure fuel pump |
Publications (2)
Publication Number | Publication Date |
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EP3798441A1 true EP3798441A1 (en) | 2021-03-31 |
EP3798441B1 EP3798441B1 (en) | 2022-08-17 |
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Family Applications (1)
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EP20193577.2A Active EP3798441B1 (en) | 2019-09-25 | 2020-08-31 | High pressure fuel pump |
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EP (1) | EP3798441B1 (en) |
DE (1) | DE102019214661A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230036743A (en) | 2021-09-08 | 2023-03-15 | 주식회사 현대케피코 | Multi-Face Contact type High Pressure Pump Mounting Sevice |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008042626A1 (en) | 2008-05-29 | 2009-12-03 | Robert Bosch Gmbh | High-pressure fuel pump |
DE102015210795A1 (en) * | 2015-06-12 | 2016-12-15 | Continental Automotive Gmbh | High-pressure fuel pump |
-
2019
- 2019-09-25 DE DE102019214661.9A patent/DE102019214661A1/en not_active Withdrawn
-
2020
- 2020-08-31 EP EP20193577.2A patent/EP3798441B1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008042626A1 (en) | 2008-05-29 | 2009-12-03 | Robert Bosch Gmbh | High-pressure fuel pump |
DE102015210795A1 (en) * | 2015-06-12 | 2016-12-15 | Continental Automotive Gmbh | High-pressure fuel pump |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230036743A (en) | 2021-09-08 | 2023-03-15 | 주식회사 현대케피코 | Multi-Face Contact type High Pressure Pump Mounting Sevice |
KR102604769B1 (en) | 2021-09-08 | 2023-11-21 | 주식회사 현대케피코 | Multi-Face Contact type High Pressure Pump Mounting Sevice |
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Publication number | Publication date |
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DE102019214661A1 (en) | 2021-03-25 |
EP3798441B1 (en) | 2022-08-17 |
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