EP2536948A1 - Cylinder head for a high-pressure fuel pump - Google Patents

Cylinder head for a high-pressure fuel pump

Info

Publication number
EP2536948A1
EP2536948A1 EP11701393A EP11701393A EP2536948A1 EP 2536948 A1 EP2536948 A1 EP 2536948A1 EP 11701393 A EP11701393 A EP 11701393A EP 11701393 A EP11701393 A EP 11701393A EP 2536948 A1 EP2536948 A1 EP 2536948A1
Authority
EP
European Patent Office
Prior art keywords
pressure
bore
cylinder head
receiving
valve
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
EP11701393A
Other languages
German (de)
French (fr)
Other versions
EP2536948B1 (en
Inventor
Friedrich Boecking
Helmut Haberer
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 EP2536948A1 publication Critical patent/EP2536948A1/en
Application granted granted Critical
Publication of EP2536948B1 publication Critical patent/EP2536948B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • 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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention relates to a cylinder head for a high-pressure fuel pump in a fuel injection system, in particular in a common-rail injection system having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel-h och d jerk pump with at least one such cylinder head.
  • a cylinder head of the aforementioned type has a high-pressure bore for forming a pump working space and for receiving a pump piston and at least one further bore for receiving a suction valve and / or a high-pressure valve.
  • Such a cylinder head is disclosed for example in the published patent application DE 10 2008 000 705 A1.
  • the cylinder head described herein has a pumping chamber in which fuel is periodically compressed and relieved via a reciprocating piston. Further, the pump working space communicates with a respective bore for receiving an intake valve and an exhaust valve via which the fuel supply and the fuel discharge is controlled. About the exhaust valve and a fuel line, the compressed fuel is supplied to a fuel rail.
  • the cylinder head has a boundary surface towards the pump housing, which is provided with a threaded bore or a threaded connection for connecting pipes in which the delivered fuel volume is collected and transferred together into a high-pressure collector. leads. The transfer can also be made via a separate connection, with which the high-pressure fuel line is connected in parallel to the pipes.
  • the cylinder head having fuel injection pump should be easier, more space-saving and complacent mountable.
  • the present invention seeks to provide a compact cylinder head ready to combine in addition to the function of high pressure compression at least one other function, in particular the function of the high pressure distribution and / or the pressure measurement in itself.
  • a cylinder head with the features of claim 1 is proposed.
  • Advantageous developments of the invention are specified in the subclaims.
  • the object is further achieved by a high-pressure fuel pump with at least one such cylinder head according to claim 9.
  • the cylinder head is formed in one piece and includes several high-pressure outlets each in the form of a lug with a bore that the
  • connection of an injector and / or the inclusion of a pressure sensor serve, wherein at least one bore of a lug is arranged coaxially with respect to the high pressure bore, in which the high pressure valve is received.
  • the proposed arrangement is a compact design of the cylinder head, in addition to the function of high-pressure compression and the
  • a pressure sensor may be integrated into a bore of a neck of the cylinder head, which is usually on the rail, i. the high-pressure manifold, is arranged.
  • the at least one bore of a lug which is arranged coaxially with respect to the bore provided for receiving the high-pressure valve, serves to receive a pressure sensor.
  • the cylinder head also combines the function of pressure measurement.
  • this is carried out in a neck of the cylinder head, a stepped bore, which forms the two coaxial bores for receiving the high pressure valve and the pressure sensor.
  • the bores formed in the high-pressure outlets can be connected to one another such that the arrangement of a pressure sensor in one
  • High pressure outlet for pressure measurement is sufficient.
  • At least one bore of a lug is at the same time designed as a bore for receiving the high-pressure valve.
  • at least one bore of a high-pressure outlet designed as a projection coincides with the bore for receiving the high-pressure valve.
  • each bore of a lug is at the same time designed as a bore for receiving a high-pressure valve.
  • a high pressure valve which is preferably designed as a check valve, is arranged. This embodiment also only requires the arrangement of a pressure sensor in one of these outlets, since deviations between the various outlets are negligible.
  • all the above-mentioned holes are connected to one another. That is, the bores formed in the high-pressure outlets formed as the approach, the bores for receiving the suction valve and the high-pressure valve, if the latter does not coincide with another bore, and the high-pressure bore are connected to one another, so that a coherent cavity volume is formed.
  • the bore for receiving the suction valve is arranged coaxially to the high-pressure bore.
  • the suction valve inserted into the bore thus limits the high-pressure bore or the pump working space in the axial direction and Can be used to seal the pump working space from the low pressure area.
  • the bore for receiving the high-pressure valve is arranged radially with respect to the high-pressure bore. Since at least one bore of a high-pressure outlet designed as a projection is formed coaxially with the bore for the high-pressure valve or at the same time as a bore for receiving the high-pressure valve, the same applies to this bore. In this way, a compact design and short connection paths are guaranteed.
  • the number of trained in the form of an approach high-pressure outlets can be 1, 2, 3 or 4. In appropriate numbers connections can be provided for injectors. Even with 4 trained as approach high-pressure outlets is still a compact design feasible.
  • the cylinder head is a casting. That is, the production of the cylinder head is preferably carried out in a casting process. Such a method allows the formation of even complex designs, so that the interconnected holes are easy to produce in one operation. It is also proposed that the preferably integrally cast cylinder head consists of a high-pressure-resistant material in order to give the cylinder head sufficient strength.
  • the additionally claimed fuel lift pump has at least one cylinder head according to the invention.
  • the number of cylinder heads determined by the number of arranged in the high-pressure fuel pump pump elements.
  • FIG. 1 shows a longitudinal section through a first embodiment of a cylinder head according to the invention
  • 2 shows a cross section through the cylinder head of FIG. 1 along the section line AA
  • FIG. 3 is a plan view of the cylinder head of Fig. 1,
  • Fig. 4 is a longitudinal section through a second embodiment of a cylinder head according to the invention.
  • FIG. 5 shows a cross section through the cylinder head of Fig. 4th
  • a first bore forms a high pressure bore 1 for receiving a pump piston (not shown) of a pump element of the high pressure pump.
  • a pump working space 2 is formed, in which the fuel is compressed via the movement of the pump piston.
  • a suction valve for its inclusion in the cylinder head coaxial with the high-pressure bore 1 arranged bore 4 is formed. The suction valve thus limits the pump working space 2 or the high-pressure bore 1 in the axial direction.
  • the fuel passes through a further bore 5 arranged radially to the high-pressure bore 1 and a high-pressure valve (not shown) arranged therein into a first high-pressure outlet formed as a projection 8.
  • the high-pressure outlet formed as a projection 8 has a bore 10 which is arranged coaxially to the bore 5 for receiving the high-pressure valve, wherein the bore 10 has a larger diameter than the bore 5 for receiving a pressure sensor 17.
  • the holes 5, 10 thus result in a radially outwardly widening stepped bore. If a pressure sensor 17 is inserted into the bore 10, the cylinder head can also assume the function of pressure measurement in addition to the function of fuel compression.
  • the cylinder head also has two further high-pressure outlets, each formed as a projection 9, with bores 11 for the injector connection. These holes are essentially radially to the High-pressure bore 1 arranged so that a compact design is achieved. Via connection channels 12, the holes 1 1 are connected to the injector connection with the bore 10 for receiving the pressure sensor 17. A recorded in the bore 10 pressure sensor 17 can thus also be used to measure the pressure of the fuel pressure in the other high-pressure outlets.
  • FIG. 3 The plan view of FIG. 3, the trained as an approach 8, 9 high pressure outlets and other perpendicular thereto arranged injector 13 can be seen. Furthermore, bores 14 for receiving fastening screws on the upper side of the cylinder head are indicated, by means of which the cylinder head can be fastened to the housing of the high-pressure fuel pump. In addition, the coaxial with the high-pressure bore 1 arranged bore 4 can be seen, in which the suction valve can be used.
  • a modification of the cylinder head shown in Figs. 1 to 3 represents the
  • a separate bore 5 can therefore be omitted, so that this embodiment is particularly compact. This applies, however, in each bore 1 1, a high-pressure valve 7 is arranged. In addition, the high-pressure outlets formed as lugs 9 provide an interface to the injector ports. FIG. 5 also shows a further bore 15, which serves as an inlet (see also FIG. 4).
  • the holes 1 1 of the lugs 9 are arranged radially with respect to the high-pressure bore 1 of the cylinder head. This arrangement allows the design of up to four high-pressure outlets.
  • the arranged in the holes 1 1 high-pressure valves 7 limit the formed in the high-pressure hole 1 pump working space 2 thus in the radial direction.
  • the bore 4 for receiving the suction valve 6 is arranged coaxially to the high-pressure bore 1, which limits the pump working space 2 in the axial direction. Another limitation in the axial direction undergoes the pump working space 2 a pump piston 3 received in the high-pressure bore 1 (see FIG. 4).
  • Fig. 4 is a of the bore 1 1 and 5 for receiving the high-pressure valve 7 branched bore 16 visible, which leads to a pressure sensor 17 for pressure measurement.
  • the bore 16 may be formed as a connecting bore or as a receiving bore, so that the pressure sensor 17 is optionally integrated into the cylinder head.
  • the arrangement of a pressure sensor 17 in the region of a high-pressure outlet is sufficient for pressure measurement in the high-pressure region.
  • the cylinder head according to the invention is suitable for a number of high-pressure pumps.
  • a designed as a radial piston pump fuel high-pressure pump which may also have several, for example, three pump elements, each pump element is associated with a corresponding cylinder head.

Abstract

The invention relates to a cylinder head for a high-pressure fuel pump in a fuel injection system, in particular in a common rail injection system, wherein a high-pressure bore (1) for forming a pump working chamber (2) and for receiving a pump piston (3) and at least one additional bore (4, 5) for receiving an intake valve (6) and/or a high-pressure valve (7) are designed in the cylinder head. According to the invention, the cylinder head has an integral design and comprises a plurality of high-pressure outlets, each in the form of a shoulder (8, 9) having a bore (10, 11), which are used to connect an injector and/or receive a pressure sensor (17), wherein at least one bore (10, 11) of a shoulder (8, 9) is arranged coaxially in relation to the high-pressure bore (5) in which the high-pressure valve (7) is received. The invention further relates to a high-pressure fuel pump comprising at least one such cylinder head.

Description

Beschreibung Titel  Description title
Zylinderkopf für eine Kraftstoffhochdruckpumpe  Cylinder head for a high-pressure fuel pump
Die Erfindung betrifft einen Zylinderkopf für eine Kraftstoffhochdruckpumpe in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail- Einspritzsystem mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung eine Kraftstoffh och d ruckpumpe mit wenigstens einem solchen Zylinderkopf. The invention relates to a cylinder head for a high-pressure fuel pump in a fuel injection system, in particular in a common-rail injection system having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel-h och d jerk pump with at least one such cylinder head.
Stand der Technik State of the art
Ein Zylinderkopf der vorstehend genannten Art weist eine Hochdruckbohrung zur Ausbildung eines Pumpenarbeitsraumes und zur Aufnahme eines Pumpenkolbens sowie wenigstens eine weitere Bohrung zur Aufnahme eines Saugventils und/oder eines Hochdruckventils auf. A cylinder head of the aforementioned type has a high-pressure bore for forming a pump working space and for receiving a pump piston and at least one further bore for receiving a suction valve and / or a high-pressure valve.
Ein derartiger Zylinderkopf ist beispielsweise in der Offenlegungsschrift DE 10 2008 000 705 A1 offenbart. Der hierin beschriebene Zylinderkopf weist einen Pumpenarbeitsraum auf, in dem Brennstoff über einen sich hin- und herbewegenden Kolben periodisch komprimiert und entlastet wird. Ferner steht der Pumpenarbeitsraum mit jeweils einer Bohrung zur Aufnahme eines Einlassventils und eines Auslassventils in Verbindung, über welche der Brennstoffzufluss und der Brennstoffabfluss gesteuert wird. Über das Auslassventil und eine Brennstoffleitung wird der komprimierte Brennstoff einer Brennstoffverteilerleiste zugeführt. Such a cylinder head is disclosed for example in the published patent application DE 10 2008 000 705 A1. The cylinder head described herein has a pumping chamber in which fuel is periodically compressed and relieved via a reciprocating piston. Further, the pump working space communicates with a respective bore for receiving an intake valve and an exhaust valve via which the fuel supply and the fuel discharge is controlled. About the exhaust valve and a fuel line, the compressed fuel is supplied to a fuel rail.
Ein weiterer gattungsgemäßer Zylinderkopf ist in der Offenlegungsschrift DE 10 2008 010 240 A1 offenbart. Der Zylinderkopf besitzt zum Pumpengehäuse hin eine Begrenzungsfläche, die mit einer Gewindebohrung oder einem Gewindestutzen zum Anschluss von Rohrleitungen versehen ist, in denen das geförderte Kraftstoffvolumina gesammelt und gemeinsam in einen Hochdrucksammler über- führt wird. Die Überführung kann auch über einen separaten Anschluss erfolgen, mit welchem die Kraftstoffhochdruckleitung parallel zu den Rohrleitungen verbunden ist. Die den Zylinderkopf aufweisende Kraftstoffeinspritzpumpe soll dadurch leichter, platzsparender und gefälliger montierbar sein. Another generic cylinder head is disclosed in the published patent application DE 10 2008 010 240 A1. The cylinder head has a boundary surface towards the pump housing, which is provided with a threaded bore or a threaded connection for connecting pipes in which the delivered fuel volume is collected and transferred together into a high-pressure collector. leads. The transfer can also be made via a separate connection, with which the high-pressure fuel line is connected in parallel to the pipes. The cylinder head having fuel injection pump should be easier, more space-saving and complacent mountable.
Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen kompaktbauenden Zylinderkopf bereit zustellen, der neben der Funktion der Hochdruckverdichtung wenigstens eine weitere Funktion, insbesondere die Funktion der Hochdruckverteilung und/oder der Druckmessung, in sich vereint. Based on the above-mentioned prior art, the present invention seeks to provide a compact cylinder head ready to combine in addition to the function of high pressure compression at least one other function, in particular the function of the high pressure distribution and / or the pressure measurement in itself.
Zur Lösung der Aufgabe wird ein Zylinderkopf mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung werden in den Unteransprüchen angegeben. Die Aufgabe wird ferner gelöst durch eine Kraftstoff- hochdruckpumpe mit wenigstens einem solchen Zylinderkopf gemäß Anspruch 9. To solve the problem, a cylinder head with the features of claim 1 is proposed. Advantageous developments of the invention are specified in the subclaims. The object is further achieved by a high-pressure fuel pump with at least one such cylinder head according to claim 9.
Offenbarung der Erfindung Disclosure of the invention
Erfindungsgemäß ist der Zylinderkopf einteilig ausgebildet und umfasst mehrere Hochdruckabgänge jeweils in Form eines Ansatzes mit einer Bohrung, die demAccording to the cylinder head is formed in one piece and includes several high-pressure outlets each in the form of a lug with a bore that the
Anschluss eines Injektors und/oder der Aufnahme eines Drucksensors dienen, wobei wenigstens eine Bohrung eines Ansatzes koaxial in Bezug auf die Hochdruckbohrung angeordnet ist, in welcher das Hochdruckventil aufgenommen ist. Die vorgeschlagene Anordnung dient einer kompaktbauenden Ausgestaltung des Zylinderkopfes, der neben der Funktion der Hochdruckverdichtung auch dieConnection of an injector and / or the inclusion of a pressure sensor serve, wherein at least one bore of a lug is arranged coaxially with respect to the high pressure bore, in which the high pressure valve is received. The proposed arrangement is a compact design of the cylinder head, in addition to the function of high-pressure compression and the
Funktion der Hochdruckverteilung und/oder der Druckmessung zu erfüllen vermag. Somit werden die in der Regel von separaten Baugruppen übernommenen Funktionen in den Zylinderkopf verlagert. Beispielsweise kann ein Drucksensor in eine Bohrung eines Ansatzes des Zylinderkopfes integriert werden, welcher übli- cherweise am Rail, d.h. der Hochdrucksammelleitung, angeordnet ist. Durch dieFunction of the high pressure distribution and / or pressure measurement is able to meet. Thus, the inherited from separate modules usually functions are displaced into the cylinder head. For example, a pressure sensor may be integrated into a bore of a neck of the cylinder head, which is usually on the rail, i. the high-pressure manifold, is arranged. By the
Integration zusätzlicher Funktionen in den einstückig ausgebildeten Zylinderkopf kann die Ausbildung von Anschlüssen und Dichtstellen reduziert werden. Zudem sinkt die Anzahl der insgesamt erforderlichen Bauteile oder Baugruppen. Der Zylinderkopf hilft somit Gewicht und Bauraum zu sparen. Gemäß einer bevorzugten Ausführungsform dient die wenigstens eine Bohrung eines Ansatzes, die koaxial in Bezug auf die zur Aufnahme des Hochdruckventils vorgesehene Bohrung angeordnet ist, der Aufnahme eines Drucksensors. Somit vereint der Zylinderkopf neben der Funktion der Hochdruckverdichtung auch die Funktion der Druckmessung in sich. Vorteilhafterweise ist hierzu in einem Ansatz des Zylinderkopfes eine Stufenbohrung ausgeführt, welche die beiden koaxial angeordneten Bohrungen zur Aufnahme des Hochdruckventils und des Drucksensors ausbildet. Bei mehreren am Zylinderkopf angeordneten Hochdruckabgängen, können die in den Hochdruckabgängen ausgebildeten Bohrungen derart miteinander verbunden sein, dass die Anordnung eines Drucksensors in einemIntegration of additional functions in the integrally formed cylinder head, the formation of terminals and sealing points can be reduced. In addition, the number of required components or assemblies decreases. The cylinder head thus helps to save weight and space. According to a preferred embodiment, the at least one bore of a lug, which is arranged coaxially with respect to the bore provided for receiving the high-pressure valve, serves to receive a pressure sensor. Thus, in addition to the function of high-pressure compression, the cylinder head also combines the function of pressure measurement. Advantageously, this is carried out in a neck of the cylinder head, a stepped bore, which forms the two coaxial bores for receiving the high pressure valve and the pressure sensor. In the case of several high-pressure outlets arranged on the cylinder head, the bores formed in the high-pressure outlets can be connected to one another such that the arrangement of a pressure sensor in one
Hochdruckabgang zur Druckmessung ausreicht. Beispielsweise können von der Bohrung zur Aufnahme des Drucksensors Verbindungsbohrungen zu den Bohrungen der weiteren Hochdruckabgänge ausgebildet sein. High pressure outlet for pressure measurement is sufficient. For example, can be formed from the bore for receiving the pressure sensor connecting bores to the bores of the other high-pressure outlets.
Um eine noch kompaktere Bauform des Zylinderkopfes zu erzielen, wird weiterhin vorgeschlagen, dass wenigstens eine Bohrung eines Ansatzes zugleich als Bohrung zur Aufnahme des Hochdruckventils ausgebildet ist. Somit fällt wenigstens eine Bohrung eines als Ansatz ausgebildeten Hochdruckabgangs mit der Bohrung zur Aufnahme des Hochdruckventils zusammen. Vorteilhafterweise ist jede Bohrung eines Ansatzes zugleich als Bohrung zur Aufnahme eines Hochdruckventils ausgebildet. Das heißt, dass in jedem Hochdruckabgang ein Hochdruckventil, das vorzugsweise als Rückschlagventil ausgebildet ist, angeordnet ist. Auch diese Ausführungsform bedarf lediglich der Anordnung eines Drucksensors in einem dieser Abgänge, da Abweichungen zwischen den verschiedenen Abgängen vernachlässigbar sind. In order to achieve an even more compact design of the cylinder head, it is further proposed that at least one bore of a lug is at the same time designed as a bore for receiving the high-pressure valve. Thus, at least one bore of a high-pressure outlet designed as a projection coincides with the bore for receiving the high-pressure valve. Advantageously, each bore of a lug is at the same time designed as a bore for receiving a high-pressure valve. This means that in each high pressure outlet, a high pressure valve, which is preferably designed as a check valve, is arranged. This embodiment also only requires the arrangement of a pressure sensor in one of these outlets, since deviations between the various outlets are negligible.
Des Weiteren vorzugsweise stehen sämtliche vorstehend genannte Bohrungen miteinander in Verbindung. Das heißt, dass die in den als Ansatz ausgebildeten Hochdruckabgängen ausgebildeten Bohrungen, die Bohrungen zur Aufnahme des Saugventils und des Hochdruckventils, sofern letztere nicht mit einer anderen Bohrung zusammenfällt, und die Hochdruckbohrung miteinander verbunden sind, so dass ein zusammenhängendes Hohlraumvolumen ausgebildet wird. Furthermore, preferably, all the above-mentioned holes are connected to one another. That is, the bores formed in the high-pressure outlets formed as the approach, the bores for receiving the suction valve and the high-pressure valve, if the latter does not coincide with another bore, and the high-pressure bore are connected to one another, so that a coherent cavity volume is formed.
Bevorzugt ist die Bohrung zur Aufnahme des Saugventils koaxial zur Hochdruck- bohrung angeordnet. Das in die Bohrung eingesetzte Saugventil begrenzt somit die Hochdruckbohrung bzw. den Pumpenarbeitsraum in axialer Richtung und kann zur Abdichtung des Pumpenarbeitsraumes gegenüber dem Niederdruckbereich herangezogen werden. Preferably, the bore for receiving the suction valve is arranged coaxially to the high-pressure bore. The suction valve inserted into the bore thus limits the high-pressure bore or the pump working space in the axial direction and Can be used to seal the pump working space from the low pressure area.
Vorteilhafterweise ist die Bohrung zur Aufnahme des Hochdruckventils radial in Bezug auf die Hochdruckbohrung angeordnet. Da wenigstens eine Bohrung eines als Ansatz ausgebildeten Hochdruckabgangs koaxial zur Bohrung für das Hochdruckventil oder zugleich als Bohrung zur Aufnahme des Hochdruckventils ausgebildet ist, gilt Entsprechendes für diese Bohrung. Auf diese Weise sind eine kompakte Bauform sowie kurze Anschlusswege gewährleistet. Advantageously, the bore for receiving the high-pressure valve is arranged radially with respect to the high-pressure bore. Since at least one bore of a high-pressure outlet designed as a projection is formed coaxially with the bore for the high-pressure valve or at the same time as a bore for receiving the high-pressure valve, the same applies to this bore. In this way, a compact design and short connection paths are guaranteed.
Die Anzahl der in Form eines Ansatzes ausgebildeten Hochdruckabgänge kann 1 , 2, 3 oder 4 betragen. In entsprechender Zahl können Anschlüsse für Injektoren vorgesehen sein. Auch bei 4 als Ansatz ausgebildeten Hochdruckabgängen ist noch eine kompakte Bauform realisierbar. The number of trained in the form of an approach high-pressure outlets can be 1, 2, 3 or 4. In appropriate numbers connections can be provided for injectors. Even with 4 trained as approach high-pressure outlets is still a compact design feasible.
Vorteilhafterweise ist der Zylinderkopf ein Gussteil. Das heißt, dass die Herstellung des Zylinderkopfes bevorzugt in einem Gießverfahren erfolgt. Ein solches Verfahren ermöglicht die Ausbildung selbst komplexer Bauformen, so dass die miteinander verbundenen Bohrungen in einem Arbeitsgang leicht herstellbar sind. Ferner wird vorgeschlagen, dass der vorzugsweise einstückig gegossene Zylinderkopf aus einem hochdruckfesten Werkstoff besteht, um dem Zylinderkopf eine ausreichende Festigkeit zu verleihen. Advantageously, the cylinder head is a casting. That is, the production of the cylinder head is preferably carried out in a casting process. Such a method allows the formation of even complex designs, so that the interconnected holes are easy to produce in one operation. It is also proposed that the preferably integrally cast cylinder head consists of a high-pressure-resistant material in order to give the cylinder head sufficient strength.
Die darüber hinaus beanspruchte Kraftstoffh och d ruckpumpe weist wenigstens einen erfindungsgemäßen Zylinderkopf auf. Die Anzahl der Zylinderköpfe bestimmt sich dabei nach der Anzahl der in der Kraftstoffhochdruckpumpe angeordneten Pumpenelemente. Somit kommen die Vorteile eines erfindungsgemäßen Zylinderkopfes ggf. mehrfach an einer Kraftstoffhochdruckpumpe zum Tragen. The additionally claimed fuel lift pump has at least one cylinder head according to the invention. The number of cylinder heads determined by the number of arranged in the high-pressure fuel pump pump elements. Thus, the advantages of a cylinder head according to the invention, if necessary several times to a high-pressure fuel pump to bear.
Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher beschrieben. Diese zeigen: Preferred embodiments of the invention are described below with reference to the accompanying drawings. These show:
Fig. 1 einen Längsschnitt durch eine erste Ausführungsform eines erfindungs- gemäßen Zylinderkopfes, Fig. 2 einen Querschnitt durch den Zylinderkopf der Fig. 1 entlang der Schnittlinie A-A, 1 shows a longitudinal section through a first embodiment of a cylinder head according to the invention, 2 shows a cross section through the cylinder head of FIG. 1 along the section line AA,
Fig. 3 eine Draufsicht auf den Zylinderkopf der Fig. 1 , 3 is a plan view of the cylinder head of Fig. 1,
Fig. 4 einen Längsschnitt durch eine zweite Ausführungsform eines erfindungsgemäßen Zylinderkopfes und Fig. 4 is a longitudinal section through a second embodiment of a cylinder head according to the invention and
Fig. 5 einen Querschnitt durch den Zylinderkopf der Fig. 4. 5 shows a cross section through the cylinder head of Fig. 4th
Ausführliche Beschreibung der Figuren Detailed description of the figures
Der Fig. 1 ist ein Zylinderkopf für eine Kraftstoffhochdruckpumpe mit mehreren miteinander in Verbindung stehenden Bohrungen 1 , 4, 5, 10, 1 1 zu entnehmen. Eine erste Bohrung bildet eine Hochdruckbohrung 1 zur Aufnahme eines Pumpenkolbens (nicht dargestellt) eines Pumpenelementes der Hochdruckpumpe aus. Innerhalb der Bohrung 1 ist ein Pumpenarbeitsraum 2 ausgebildet, in welchem der Kraftstoff über die Bewegung des Pumpenkolbens verdichtet wird. In den Pumpenarbeitsraum 2 gelangt der Kraftstoff über ein Saugventil (nicht dargestellt), zu dessen Aufnahme im Zylinderkopf die koaxial zur Hochdruckbohrung 1 angeordnete Bohrung 4 ausgebildet ist. Das Saugventil begrenzt somit den Pumpenarbeitsraum 2 bzw. die Hochdruckbohrung 1 in axialer Richtung. Nach dem Verdichten gelangt der Kraftstoff über eine radial zur Hochdruckbohrung 1 angeordnete, weitere Bohrung 5 und ein hierin angeordnetes Hochdruckventil (nicht dargestellt) in einen ersten als Ansatz 8 ausgebildeten Hochdruckabgang. Der als Ansatz 8 ausgebildete Hochdruckabgang weist eine Bohrung 10 auf, die koaxial zur Bohrung 5 zur Aufnahme des Hochdruckventils angeordnet ist, wobei die Bohrung 10 einen größeren Durchmesser als die Bohrung 5 zur Aufnahme eines Drucksensors 17 aufweist. Die Bohrungen 5, 10 ergeben somit eine sich nach radial außen aufweitende Stufenbohrung. Wird in die Bohrung 10 ein Drucksensor 17 eingesetzt, kann der Zylinderkopf neben der Funktion der Kraftstoffverdichtung auch die Funktion der Druckmessung übernehmen. 1 is a cylinder head for a high-pressure fuel pump with a plurality of interconnected holes 1, 4, 5, 10, 1 1 can be seen. A first bore forms a high pressure bore 1 for receiving a pump piston (not shown) of a pump element of the high pressure pump. Within the bore 1, a pump working space 2 is formed, in which the fuel is compressed via the movement of the pump piston. In the pump working chamber 2 of the fuel via a suction valve (not shown), for its inclusion in the cylinder head coaxial with the high-pressure bore 1 arranged bore 4 is formed. The suction valve thus limits the pump working space 2 or the high-pressure bore 1 in the axial direction. After compression, the fuel passes through a further bore 5 arranged radially to the high-pressure bore 1 and a high-pressure valve (not shown) arranged therein into a first high-pressure outlet formed as a projection 8. The high-pressure outlet formed as a projection 8 has a bore 10 which is arranged coaxially to the bore 5 for receiving the high-pressure valve, wherein the bore 10 has a larger diameter than the bore 5 for receiving a pressure sensor 17. The holes 5, 10 thus result in a radially outwardly widening stepped bore. If a pressure sensor 17 is inserted into the bore 10, the cylinder head can also assume the function of pressure measurement in addition to the function of fuel compression.
Wie der Fig. 2 zu entnehmen ist, weist der Zylinderkopf ferner zwei weitere, je- weils als Ansatz 9 ausgebildete Hochdruckabgänge mit Bohrungen 1 1 für den In- jektoranschluss auf. Auch diese Bohrungen sind im Wesentlichen radial zur Hochdruckbohrung 1 angeordnet, so dass eine kompakte Bauform erreicht wird. Über Verbindungskanäle 12 sind die Bohrungen 1 1 für den Injektoranschluss mit der Bohrung 10 zur Aufnahme des Drucksensors 17 verbunden. Ein in der Bohrung 10 aufgenommener Drucksensor 17 kann somit auch zur Druckmessung des Kraftstoffdrucks in den weiteren Hochdruckabgängen herangezogen werden. As can be seen from FIG. 2, the cylinder head also has two further high-pressure outlets, each formed as a projection 9, with bores 11 for the injector connection. These holes are essentially radially to the High-pressure bore 1 arranged so that a compact design is achieved. Via connection channels 12, the holes 1 1 are connected to the injector connection with the bore 10 for receiving the pressure sensor 17. A recorded in the bore 10 pressure sensor 17 can thus also be used to measure the pressure of the fuel pressure in the other high-pressure outlets.
Der Draufsicht der Fig. 3 sind die als Ansatz 8, 9 ausgebildeten Hochdruckabgänge sowie weitere senkrecht hierzu angeordnete Injektoranschlüsse 13 zu entnehmen. Ferner sind Bohrungen 14 zur Aufnahme von Befestigungsschrau- ben auf der Oberseite des Zylinderkopfes angedeutet, mittels welcher der Zylinderkopf an dem Gehäuse der Kraftstoffhochdruckpumpe befestigbar ist. Darüber hinaus ist die koaxial zur Hochdruckbohrung 1 angeordnete Bohrung 4 erkennbar, in welche das Saugventil einsetzbar ist. Eine Abwandlung des in den Fig. 1 bis 3 dargestellten Zylinderkopfes stellt derThe plan view of FIG. 3, the trained as an approach 8, 9 high pressure outlets and other perpendicular thereto arranged injector 13 can be seen. Furthermore, bores 14 for receiving fastening screws on the upper side of the cylinder head are indicated, by means of which the cylinder head can be fastened to the housing of the high-pressure fuel pump. In addition, the coaxial with the high-pressure bore 1 arranged bore 4 can be seen, in which the suction valve can be used. A modification of the cylinder head shown in Figs. 1 to 3 represents the
Zylinderkopf der Fig. 4 und 5 dar. Bei dieser Ausführungsform sind ebenfalls beispielhaft drei als Ansätze 9 ausgebildete Hochdruckabgänge vorgesehen, die jeweils eine Bohrung 1 1 aufweisen, wobei in jeder Bohrung 1 1 ein als Rückschlagventil ausgebildetes Hochdruckventil 7 angeordnet ist (siehe Fig. 5). Jede der Bohrungen 1 1 dient somit als Bohrung 5 zur Aufnahme eines Hochdruckventils 7.Cylinder head of Fig. 4 and 5. In this embodiment, three trained as lugs 9 Hochdruckabgänge are also provided, each having a bore 1 1, wherein in each bore 1 1 designed as a check valve high-pressure valve 7 is arranged (see FIG ). Each of the holes 1 1 thus serves as a bore 5 for receiving a high-pressure valve. 7
Eine separate Bohrung 5 kann demnach entfallen, so dass diese Ausführungsform besonders kompaktbauend ist. Dies gilt, gleichwohl in jeder Bohrung 1 1 ein Hochdruckventil 7 angeordnet ist. Denn darüber hinaus stellen die als Ansätze 9 ausgebildeten Hochdruckabgänge eine Schnittstelle zu den Injektoranschlüssen dar. Der Fig. 5 ist ferner eine weitere Bohrung 15 zu entnehmen, die als Zulauf dient (siehe auch Fig. 4). A separate bore 5 can therefore be omitted, so that this embodiment is particularly compact. This applies, however, in each bore 1 1, a high-pressure valve 7 is arranged. In addition, the high-pressure outlets formed as lugs 9 provide an interface to the injector ports. FIG. 5 also shows a further bore 15, which serves as an inlet (see also FIG. 4).
Die Bohrungen 1 1 der Ansätze 9 sind radial in Bezug auf die Hochdruckbohrung 1 des Zylinderkopfes angeordnet. Diese Anordnung ermöglicht die Ausbil- dung von bis zu vier Hochdruckabgängen. Die in den Bohrungen 1 1 angeordneten Hochdruckventile 7 begrenzen den in der Hochdruckbohrung 1 ausgebildeten Pumpenarbeitsraum 2 somit in radialer Richtung. Demgegenüber ist die Bohrung 4 zur Aufnahme des Saugventils 6 koaxial zur Hochdruckbohrung 1 angeordnet, welches den Pumpenarbeitsraum 2 in axialer Richtung begrenzt. Eine weitere Begrenzung in axialer Richtung erfährt der Pumpenarbeitsraum 2 durch einen in der Hochdruckbohrung 1 aufgenommenen Pumpenkolben 3 (siehe Fig. 4). The holes 1 1 of the lugs 9 are arranged radially with respect to the high-pressure bore 1 of the cylinder head. This arrangement allows the design of up to four high-pressure outlets. The arranged in the holes 1 1 high-pressure valves 7 limit the formed in the high-pressure hole 1 pump working space 2 thus in the radial direction. In contrast, the bore 4 for receiving the suction valve 6 is arranged coaxially to the high-pressure bore 1, which limits the pump working space 2 in the axial direction. Another limitation in the axial direction undergoes the pump working space 2 a pump piston 3 received in the high-pressure bore 1 (see FIG. 4).
Ferner ist aus Fig. 4 eine von der Bohrung 1 1 bzw. 5 zur Aufnahme des Hochdruckventils 7 abzweigende Bohrung 16 ersichtlich, die zu einem Drucksensor 17 zur Druckmessung führt. Die Bohrung 16 kann als Verbindungsbohrung oder als Aufnahmebohrung ausgebildet sein, so dass der Drucksensor 17 wahlweise in den Zylinderkopf integrierbar ist. Die Anordnung eines Drucksensors 17 im Bereich eines Hochdruckabgangs reicht zur Druckmessung im Hochdruckbereich aus. Further, from Fig. 4 is a of the bore 1 1 and 5 for receiving the high-pressure valve 7 branched bore 16 visible, which leads to a pressure sensor 17 for pressure measurement. The bore 16 may be formed as a connecting bore or as a receiving bore, so that the pressure sensor 17 is optionally integrated into the cylinder head. The arrangement of a pressure sensor 17 in the region of a high-pressure outlet is sufficient for pressure measurement in the high-pressure region.
Durch die Vielseitigkeit der Ausgestaltung ist der erfindungsgemäße Zylinderkopf für eine Reihe von Hochdruckpumpen geeignet. Vorzugsweise findet er jedoch Einsatz in einer als Radialkolbenpumpe ausgebildeten Kraftstoff hochdruckpumpe, die auch mehrere, beispielsweise drei Pumpenelemente, aufweisen kann, wobei jedem Pumpenelement ein entsprechender Zylinderkopf zugeordnet ist. Due to the versatility of the design, the cylinder head according to the invention is suitable for a number of high-pressure pumps. Preferably, however, he finds use in a designed as a radial piston pump fuel high-pressure pump, which may also have several, for example, three pump elements, each pump element is associated with a corresponding cylinder head.

Claims

Ansprüche claims
1 . Zylinderkopf für eine Kraftstoffhochdruckpumpe in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, wobei im Zylinderkopf eine Hochdruckbohrung (1 ) zur Ausbildung eines Pumpenarbeitsraumes (2) und zur Aufnahme eines Pumpenkolbens (3) sowie wenigstens eine weitere Bohrung (4, 5) zur Aufnahme eines Saugventils (6) und/oder eines Hochdruckventils (7) ausgebildet sind, 1 . Cylinder head for a high-pressure fuel pump in a fuel injection system, in particular in a common rail injection system, wherein in the cylinder head a high-pressure bore (1) for forming a pump working chamber (2) and for receiving a pump piston (3) and at least one further bore (4, 5) for receiving a suction valve (6) and / or a high-pressure valve (7) are formed,
dadurch gekennzeichnet, dass der Zylinderkopf einteilig ausgebildet ist und mehrere Hochdruckabgänge jeweils in Form eines Ansatzes (8, 9) mit einer Bohrung (10, 1 1 ) umfasst, die dem Anschluss eines Injektors und/oder der Aufnahme eines Drucksensors (17) dienen, wobei wenigstens eine Bohrung (10, 1 1 ) eines Ansatzes (8, 9) koaxial in Bezug auf die Hochdruckbohrung (5) angeordnet ist, in welcher das Hochdruckventil (7) aufgenommen ist. characterized in that the cylinder head is integrally formed and comprises a plurality of high-pressure outlets each in the form of a projection (8, 9) with a bore (10, 11), which serve to connect an injector and / or to receive a pressure sensor (17), wherein at least one bore (10, 1 1) of a projection (8, 9) coaxially with respect to the high-pressure bore (5) is arranged, in which the high-pressure valve (7) is accommodated.
2. Zylinderkopf nach Anspruch 1 , 2. Cylinder head according to claim 1,
dadurch gekennzeichnet, dass die wenigstens eine Bohrung (10, 1 1 ) eines Ansatzes (8, 9), die koaxial in Bezug auf die zur Aufnahme des Hochdruckventils (7) vorgesehene Bohrung (5) angeordnet ist, der Aufnahme eines Drucksensors (17) dient. characterized in that the at least one bore (10, 11) of a projection (8, 9) arranged coaxially with respect to the bore (5) provided for receiving the high-pressure valve (7) accommodates a pressure sensor (17). serves.
3. Zylinderkopf nach Anspruch 1 oder 2, 3. Cylinder head according to claim 1 or 2,
dadurch gekennzeichnet, dass wenigstens eine Bohrung (1 1 ) eines Ansatzes (9) zugleich als Bohrung (5) zur Aufnahme des Hochdruckventils (7) ausgebildet ist und/oder jede Bohrung (10, 1 1 ) eines Ansatzes (8, 9) zugleich als Bohrung (5) zur Aufnahme eines Hochdruckventils (7) ausgebildet ist. characterized in that at least one bore (1 1) of a projection (9) at the same time as a bore (5) for receiving the high pressure valve (7) is formed and / or each bore (10, 1 1) of a lug (8, 9) at the same time as a bore (5) for receiving a high-pressure valve (7) is formed.
4. Zylinderkopf nach einem der vorhergehenden Ansprüche, 4. Cylinder head according to one of the preceding claims,
dadurch gekennzeichnet, dass die Bohrungen (1 , 4, 5, 10, 1 1 ) miteinander in Verbindung stehen. characterized in that the bores (1, 4, 5, 10, 1 1) communicate with each other.
5. Zylinderkopf nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Bohrung (4) zur Aufnahme des Saugventils (6) koaxial zur Hochdruckbohrung (1 ) angeordnet ist. 5. Cylinder head according to one of the preceding claims, characterized in that the bore (4) for receiving the suction valve (6) is arranged coaxially to the high-pressure bore (1).
6. Zylinderkopf nach einem der vorhergehenden Ansprüche, 6. Cylinder head according to one of the preceding claims,
dadurch gekennzeichnet, dass die Bohrung (5) zur Aufnahme des Hochdruckventils (7) radial in Bezug auf die Hochdruckbohrung (1 ) angeordnet ist. characterized in that the bore (5) for receiving the high-pressure valve (7) is arranged radially with respect to the high-pressure bore (1).
7. Zylinderkopf nach einem der vorhergehenden Ansprüche, 7. Cylinder head according to one of the preceding claims,
dadurch gekennzeichnet, dass die Anzahl der in Form eines Ansatzes (8, 9) ausgebildeten Hochdruckabgänge 1 , 2, 3 oder 4 beträgt. characterized in that the number of in the form of a projection (8, 9) formed high-pressure outlets 1, 2, 3 or 4.
8. Zylinderkopf nach einem der vorhergehenden Ansprüche, 8. Cylinder head according to one of the preceding claims,
dadurch gekennzeichnet, dass der Zylinderkopf ein Gussteil ist und/oder aus einem hochdruckfesten Werkstoff besteht. characterized in that the cylinder head is a casting and / or consists of a high pressure resistant material.
9. Kraftstoffhochdruckpumpe mit wenigstens einem Zylinderkopf nach einem der vorhergehenden Ansprüche. 9. High-pressure fuel pump with at least one cylinder head according to one of the preceding claims.
EP11701393.8A 2010-02-16 2011-01-24 Cylinder head for a high-pressure fuel pump Not-in-force EP2536948B1 (en)

Applications Claiming Priority (2)

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DE201010001965 DE102010001965A1 (en) 2010-02-16 2010-02-16 Cylinder head for a high-pressure fuel pump
PCT/EP2011/050877 WO2011101203A1 (en) 2010-02-16 2011-01-24 Cylinder head for a high-pressure fuel pump

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EP2536948A1 true EP2536948A1 (en) 2012-12-26
EP2536948B1 EP2536948B1 (en) 2016-10-19

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CN (1) CN102762859B (en)
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DE102013210036A1 (en) * 2013-05-29 2014-12-04 Robert Bosch Gmbh High pressure pump for a fuel injection system
DE102014213641A1 (en) 2014-01-17 2015-08-06 Borgwarner Inc. Method for connecting a compressor wheel with a shaft of a charging device

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JP4088738B2 (en) * 1998-12-25 2008-05-21 株式会社デンソー Fuel injection pump
DE10046315C2 (en) * 2000-09-19 2002-11-14 Siemens Ag High pressure pump for a storage injection system and storage injection system
DE10229396A1 (en) * 2002-06-29 2004-01-22 Robert Bosch Gmbh Radial piston pump for high-pressure fuel supply in injection systems of internal combustion engines with improved efficiency
DE10302043A1 (en) * 2002-10-31 2004-05-19 Robert Bosch Gmbh High pressure fuel pump with ball valve in the low pressure inlet
CN100489305C (en) * 2004-12-28 2009-05-20 罗伯特·博世有限公司 Piston pump
DE102008010240A1 (en) 2008-02-21 2009-08-27 Robert Bosch Gmbh Fuel injection pump has housing with shaft pivoted around axis, where shaft has outward projecting radial cam, and pipe line is attached to connection opening of cylinder head
DE102008000705A1 (en) 2008-03-17 2009-09-24 Robert Bosch Gmbh high pressure pump

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EP2536948B1 (en) 2016-10-19
CN102762859A (en) 2012-10-31

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