WO2012041627A1 - High-pressure fuel pump - Google Patents

High-pressure fuel pump Download PDF

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Publication number
WO2012041627A1
WO2012041627A1 PCT/EP2011/065074 EP2011065074W WO2012041627A1 WO 2012041627 A1 WO2012041627 A1 WO 2012041627A1 EP 2011065074 W EP2011065074 W EP 2011065074W WO 2012041627 A1 WO2012041627 A1 WO 2012041627A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
pressure fuel
metallic coating
housing part
plastic
Prior art date
Application number
PCT/EP2011/065074
Other languages
German (de)
French (fr)
Inventor
Oliver Gaertner
Daniel Gosse
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
Priority to EP11752528.7A priority Critical patent/EP2625417B1/en
Priority to CN201180045756.2A priority patent/CN103119284B/en
Publication of WO2012041627A1 publication Critical patent/WO2012041627A1/en

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star 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
    • 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
    • F02M59/445—Selection of particular materials

Definitions

  • the invention relates to a high-pressure fuel pump of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to the use of a nanocrystalline metallic coating to increase the strength and / or temperature resistance of a housing part of a high-pressure fuel pump.
  • High-pressure fuel pumps for example in the form of a radial piston pump, are well known from the prior art. They are used in fuel injection systems of motor vehicles to promote fuel, preferably diesel fuel, to high pressure.
  • a high-pressure fuel pump at least one pump element, which is accommodated in a pump housing.
  • a drive shaft with a cam or eccentric drive is also accommodated in the pump housing.
  • the pump housing or at least parts of the pump housing made of steel or aluminum.
  • Object of the present invention is to provide a high-pressure fuel pump of the type mentioned, which is optimized in terms of weight and cost.
  • a high-pressure fuel pump with the features of claim 1 is proposed.
  • Advantageous developments of the invention are specified in the subclaims.
  • the use of a nanocrystalline metallic coating for increasing the strength and / or the temperature resistance of a housing part of a high-pressure fuel pump according to claim 6 is proposed.
  • the proposed fuel return pump has a pump housing for receiving at least one pump element and a drive shaft for actuating the at least one pump element.
  • the pump housing comprises at least one housing part made of plastic.
  • the housing part made of a plastic at least in the region of a mechanically and / or thermally highly stressed point, has a nanocrystalline metallic coating which increases the strength and / or the temperature resistance.
  • the nanocrystalline metallic coating is capable of replacing an additional metallic component used for reinforcement, such as a metal sleeve.
  • the coating creates a composite component consisting of a plastic base body and a metallic coating which combines the advantages of the materials plastic and metal. Because the plastic allows the use of a cost-effective injection molding process, by means of which also very complex shapes can be produced.
  • the base body is therefore preferably an injection-molded part.
  • the use of plastic also allows a reduction in weight.
  • the advantages of the material metal are manifested in a significantly increased strength and temperature resistance of the component, at least in the area of the coating. Due to the nanocrystalline structure of the metallic coating are a good
  • the plastic is preferably a thermoplastic insert.
  • the plastic can also be reinforced by a fiber content. Glass fibers or carbon fibers are particularly suitable as reinforcing fibers.
  • the housing part made of a plastic comprises a bore for fluid guidance and / or for receiving a liftable plunger, by means of which a pump piston of a pump element can be supported on the drive shaft: the bore has at least in a partial area a strength and / or the temperature resistance increasing nanocrystalline metallic coating.
  • the housing part may be, for example, a low-pressure housing of a high-pressure pump and the bore may be a plunger bore. By the lifting movement of the plunger, the bore is subjected to friction. This is accompanied by high temperatures.
  • the nanocrystalline metallic coating increases the strength in the area of the bore and thus counteracts premature wear of the housing part. At the same time, the temperature resistance of the housing part is increased in the bore.
  • fluid-carrying bores of the housing part may also be provided with a corresponding coating.
  • the nanocrystalline metallic coating contains iron, nickel and / or titanium.
  • the abovementioned metals may be present in pure form or as an alloy, if appropriate using a further metal.
  • metals such as aluminum, copper, cobalt, molybdenum,
  • the nanocrystalline metallic coating preferably has a layer thickness between 10 and 500 ⁇ m, preferably between 20 and 250 ⁇ m, more preferably between 25 and 200 ⁇ m. Such layer thicknesses already suffice to achieve the desired effect of increased strength and / or temperature resistance.
  • the nanocrystals of the nanocrystalline metallic coating furthermore preferably have a particle size between 2 nm and 1000 nm, preferably between 10 nm and 500 nm, more preferably between 15 nm and 100 nm.
  • the housing part is a plastic injection molded part made of a thermoplastic material and the coating is applied in a layer thickness between 25 and 200 ⁇ .
  • a plastic-metal composite body can be produced, which combines the advantages of the materials plastic and metal in itself.
  • the plastic-metal composite body has a low weight and - at least at the provided with a nanocrystalline metallic coating sites - high strength and temperature resistance.
  • the plastic base body is inexpensive to produce by injection molding. Injection molding also allows the formation of complex shapes.
  • the coating is preferably applied only partially, namely only at the locations which are subjected to high mechanical stresses and / or high thermal stresses.
  • FIG. 1 and 2 are perspective views of a plastic injection molding
  • FIG. 3 shows a section through the plastic injection-molded housing of FIGS. 1 and 2. Detailed description of the drawings
  • FIGS. 1 and 2 show a housing part 2 of a pump housing 1 of a high-pressure fuel pump with a multiplicity of
  • the holes serve primarily the fluid management or the inclusion of fasteners.
  • bores 5 are provided which each serve to receive and guide a liftable plunger of a pump element (not shown). Due to the lifting movement of the plunger during operation of the high-pressure fuel pump, the holes 5 are subjected to friction. This is accompanied by a temperature increase, which represents an additional load on the housing part 2 in the region of the bore 5. At least at the holes 5 are thus mechanical and thermally highly stressed points 3. As a rule, therefore, such housing parts 2 are made of steel or aluminum as a material. In order to save weight and costs, however, the housing part 2 illustrated in FIGS. 1 and 2 is a plastic injection-molded part which is provided with a nanocrystalline metallic coating 4 in the region of the bores 5 in order to increase the strength and the temperature resistance (see also Fig. 3).
  • the formation of the main body of the housing part 2 as a plastic injection-molded part reduces the weight of the housing part 2 and simplifies the realization of complex shapes.
  • the plastic injection-molded part at least in the region of the holes 5 due to the nanocrystalline metallic coating 4 sufficient strength and temperature resistance.
  • a selective, that is to say partial, coating of the housing part 2 is already sufficient only in the area of the mechanically and / or thermally highly stressed areas 3. This can further reduce the production costs.
  • a mechanically and / or thermally highly stressed points 3 come next to the holes 5 for receiving the plunger of the pump elements further holes for fluid management or for receiving fasteners in question.
  • the housing part 2 can also be a flange component, by means of which the
  • High-pressure fuel pump to a motor housing or the like fastened is.
  • Heavily stressed points 3 of such a flange component represent, for example, the flange, parts of the inner surface or specific connection points.
  • a nanocrystalline metallic coating can therefore be limited to these points 3.
  • the entire flange component may also be provided with a nanocrystalline metallic coating.

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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)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a high-pressure fuel pump of an internal combustion engine having a pump housing (1) for accommodating at least one pump element and a drive shaft for actuating the at least one pump element, wherein the pump housing (1) comprises at least one housing part (2) which is manufactured from plastic. According to the invention, the housing part (2) which is manufactured from plastic has a nanocrystalline metallic coating (4) which increases the strength and/or the temperature resistance, at least in the region of a mechanically and/or thermally highly loaded location (3). Furthermore, the invention relates to the use of a nanocrystalline metallic coating (4) in order to increase the strength and/or the temperature resistance of a housing part (2) of a high-pressure fuel pump.

Description

Beschreibung Titel  Description title
Kraftstoffhochdruckpumpe  High-pressure fuel pump
Die Erfindung betrifft eine Kraftstoffhochdruckpumpe einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung die Verwendung einer nanokristallinen metallischen Beschichtung zur Erhöhung der Festigkeit und/oder der Temperaturbeständigkeit eines Gehäuseteils einer Kraftstoffhochdruckpumpe. The invention relates to a high-pressure fuel pump of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to the use of a nanocrystalline metallic coating to increase the strength and / or temperature resistance of a housing part of a high-pressure fuel pump.
Stand der Technik State of the art
Kraftstoffhochdruckpumpen, beispielsweise in Form einer Radialkolbenpumpe, sind aus dem Stand der Technik hinlänglich bekannt. Sie werden in Kraftstoffeinspritzsystemen von Kraftfahrzeugen eingesetzt, um Kraftstoff, vorzugsweise Dieselkraftstoff, auf Hochdruck zu fördern. Hierzu weist eine solche Kraftstoffhochdruckpumpe wenigstens ein Pumpenelement auf, das in einem Pumpengehäuse aufgenommen ist. Zur Betätigung des wenigstens einen Pumpenelementes ist ferner eine Antriebswelle mit einem Nocken- oder Exzentertrieb in dem Pumpengehäuse aufgenommen. In der Regel besteht das Pumpengehäuse oder zumindest Teile des Pumpengehäuses aus Stahl oder Aluminium. Zur Reduzierung des Gewichts und der Kosten ist bereits vorgeschlagen worden, einen Kunststoff als Grundwerkstoff für das Pumpengehäuse oder Teile desselben zu verwenden. Zur Verstärkung mechanisch stark beanspruchter Stellen wurde weiterhin bereits vorgeschlagen, Metallhülsen oder-einsätze in das Kunststoffgehäuse einzusetzen. Die Verwendung von Metallhülsen eignet sich beispielsweise zur Auskleidung von Bohrungen, die ggf. einer Beanspruchung durch Temperatur, Druck und/oder Reibung ausgesetzt sind. Nachteilig hieran ist jedoch das Erfordernis die Verwendung zusätzlicher Bauteile, die zudem genau eingepasst werden müssen. Dadurch steigen die Herstellungskosten. Aufgabe der vorliegenden Erfindung ist es, eine Kraftstoffhochdruckpumpe der eingangs genannten Art bereit zu stellen, die hinsichtlich Gewicht und Herstellungskosten optimiert ist. High-pressure fuel pumps, for example in the form of a radial piston pump, are well known from the prior art. They are used in fuel injection systems of motor vehicles to promote fuel, preferably diesel fuel, to high pressure. For this purpose, such a high-pressure fuel pump at least one pump element, which is accommodated in a pump housing. For actuating the at least one pump element, a drive shaft with a cam or eccentric drive is also accommodated in the pump housing. As a rule, the pump housing or at least parts of the pump housing made of steel or aluminum. To reduce the weight and cost, it has already been proposed to use a plastic as the base material for the pump housing or parts thereof. To reinforce mechanically stressed areas has also been proposed to use metal sleeves or inserts in the plastic housing. The use of metal sleeves is suitable, for example, for lining bores which may be subject to stress due to temperature, pressure and / or friction. A disadvantage of this, however, is the need to use additional components, which must also be precisely fitted. This increases the production costs. Object of the present invention is to provide a high-pressure fuel pump of the type mentioned, which is optimized in terms of weight and cost.
Zur Lösung der Aufgabe wird eine Kraftstoffhochdruckpumpe mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung werden in den Unteransprüchen angegeben. Ferner wird die Verwendung einer nanokristallinen metallischen Beschichtung zur Erhöhung der Festigkeit und/oder der Temperaturbeständigkeit eines Gehäuseteils einer Kraftstoffhochdruckpumpe entsprechend Anspruch 6 vorgeschlagen. To solve the problem, a high-pressure fuel pump with the features of claim 1 is proposed. Advantageous developments of the invention are specified in the subclaims. Furthermore, the use of a nanocrystalline metallic coating for increasing the strength and / or the temperature resistance of a housing part of a high-pressure fuel pump according to claim 6 is proposed.
Offenbarung der Erfindung Disclosure of the invention
Die vorgeschlagene Kraftstoffh och d ruckpumpe besitzt ein Pumpengehäuse zur Aufnahme wenigstens eines Pumpenelementes sowie einer Antriebswelle zur Betätigung des wenigstens einen Pumpenelementes. Das Pumpengehäuse um- fasst dabei wenigstens ein aus Kunststoff gefertigtes Gehäuseteil. Erfindungsgemäß weist das aus einem Kunststoff gefertigte Gehäuseteil zumindest im Bereich einer mechanisch und/oder thermisch hoch beanspruchten Stelle eine die Festigkeit und/oder die Temperaturbeständigkeit erhöhende nanokristalline metallische Beschichtung auf. Die nanokristalline metallische Beschichtung vermag ein zusätzliches zur Verstärkung eingesetztes metallisches Bauteil, wie beispielsweise eine Metallhülse, zu ersetzen. Durch die Beschichtung wird ein Verbundbauteil bestehend aus einem Grundkörper aus Kunststoff und einer metallischen Beschichtung geschaffen, das die Vorteile der Werkstoffe Kunststoff und Metall in sich vereinigt. Denn der Kunststoff ermöglicht die Verwendung eines kostengünstigen Spritzgussverfahrens, mittels dessen zudem sehr komplexe Formen herstellbar sind. Bei dem Grundkörper handelt es sich daher vorzugsweise um ein Spritzgussteil. Die Verwendung von Kunststoff ermöglicht ferner eine Reduzierung des Gewichts. Die Vorzüge des Werkstoffs Metall äußern sich in einer deutlichen erhöhten Festigkeit und Temperaturbeständigkeit des Bauteils zumindest im Bereich der Beschichtung. Durch das nanokristalline Gefüge der metallischen Beschichtung sind ein guterThe proposed fuel return pump has a pump housing for receiving at least one pump element and a drive shaft for actuating the at least one pump element. The pump housing comprises at least one housing part made of plastic. According to the invention, the housing part made of a plastic, at least in the region of a mechanically and / or thermally highly stressed point, has a nanocrystalline metallic coating which increases the strength and / or the temperature resistance. The nanocrystalline metallic coating is capable of replacing an additional metallic component used for reinforcement, such as a metal sleeve. The coating creates a composite component consisting of a plastic base body and a metallic coating which combines the advantages of the materials plastic and metal. Because the plastic allows the use of a cost-effective injection molding process, by means of which also very complex shapes can be produced. The base body is therefore preferably an injection-molded part. The use of plastic also allows a reduction in weight. The advantages of the material metal are manifested in a significantly increased strength and temperature resistance of the component, at least in the area of the coating. Due to the nanocrystalline structure of the metallic coating are a good
Verbund und damit eine ausreichende Haftung der Beschichtung auf dem Bauteil sichergestellt. Darüber hinaus können sehr dünne Schichten ausgeführt werden, die bereits zu der gewünschten Erhöhung der Festigkeit und/oder Temperaturbeständigkeit führen. Die Kosten können ferner dadurch reduziert werden, dass die Beschichtung lediglich partiell aufgetragen wird. Demzufolge ist eine Beschich- tung am Ort der Beanspruchung bereits ausreichend. Composite and thus a sufficient adhesion of the coating on the component ensured. In addition, very thin layers can be performed, which already lead to the desired increase in strength and / or temperature resistance. The cost can also be reduced by applying the coating only partially. As a result, a coating at the location of the stress is already sufficient.
Als Kunststoff findet vorzugsweise ein Thermoplast Einsatz. Der Kunststoff kann zudem durch einen Faseranteil verstärkt sein. Als Verstärkungsfasern eignen sich insbesondere Glas- oder Kohlefasern. The plastic is preferably a thermoplastic insert. The plastic can also be reinforced by a fiber content. Glass fibers or carbon fibers are particularly suitable as reinforcing fibers.
Gemäß einer bevorzugten Ausführungsform der Erfindung umfasst das aus einem Kunststoff gefertigte Gehäuseteil eine Bohrung zur Fluidführung und/oder zur Aufnahme eines hubbeweglichen Stößels, mittels welcher ein Pumpenkolben eines Pumpenelementes an der Antriebswelle abstützbar ist: Die Bohrung weist zumindest in einem Teilbereich eine die Festigkeit und/oder die Temperaturbeständigkeit erhöhende nanokristalline metallische Beschichtung auf. Bei dem Gehäuseteil kann es sich beispielsweise um ein Niederdruckgehäuse einer Hochdruckpumpe und bei der Bohrung um eine Stößelbohrung handeln. Durch die Hubbewegung des Stößels wird die Bohrung auf Reibung beansprucht. Damit einher gehen ferner hohe Temperaturen. Die nanokristalline metallische Beschichtung erhöht die Festigkeit im Bereich der Bohrung und wirkt somit einem vorzeitigen Verschleiß des Gehäuseteils entgegen. Zugleich wird die Temperaturbeständigkeit des Gehäuseteils im Bereich der Bohrung erhöht. Alternativ oder ergänzend können auch fluidführende Bohrungen des Gehäuseteils mit einer entsprechenden Beschichtung versehen sein. According to a preferred embodiment of the invention, the housing part made of a plastic comprises a bore for fluid guidance and / or for receiving a liftable plunger, by means of which a pump piston of a pump element can be supported on the drive shaft: the bore has at least in a partial area a strength and / or the temperature resistance increasing nanocrystalline metallic coating. The housing part may be, for example, a low-pressure housing of a high-pressure pump and the bore may be a plunger bore. By the lifting movement of the plunger, the bore is subjected to friction. This is accompanied by high temperatures. The nanocrystalline metallic coating increases the strength in the area of the bore and thus counteracts premature wear of the housing part. At the same time, the temperature resistance of the housing part is increased in the bore. Alternatively or additionally, fluid-carrying bores of the housing part may also be provided with a corresponding coating.
Vorteilhafterweise enthält die nanokristalline metallische Beschichtung Eisen, Nickel und/oder Titan. Die vorstehend genannten Metalle können in Reinform oder als Legierung ggf. unter Verwendung eines weiteren Metalls vorliegen. Alternativ oder ergänzend können auch Metalle wie Aluminium, Kupfer, Kobalt, Molybdän,Advantageously, the nanocrystalline metallic coating contains iron, nickel and / or titanium. The abovementioned metals may be present in pure form or as an alloy, if appropriate using a further metal. Alternatively or additionally, metals such as aluminum, copper, cobalt, molybdenum,
Platin und/oder Zirkonium sowie Legierungen hieraus Einsatz finden. Platinum and / or zirconium and alloys thereof find use.
Bevorzugt weist die nanokristalline metallische Beschichtung eine Schichtstärke zwischen 10 und 500μιη, vorzugsweise zwischen 20 und 250μιη, weiterhin vor- zugsweise zwischen 25 und 200μιη auf. Derartige Schichtstärken reichen bereits aus, um den gewünschten Effekt einer erhöhten Festigkeit und/oder Temperaturbeständigkeit zu erzielen. The nanocrystalline metallic coating preferably has a layer thickness between 10 and 500 μm, preferably between 20 and 250 μm, more preferably between 25 and 200 μm. Such layer thicknesses already suffice to achieve the desired effect of increased strength and / or temperature resistance.
Zur Ausbildung derart dünner Schichtstärken weisen die Nanokristalle der na- nokristallinen metallischen Beschichtung weiterhin bevorzugt eine Korngröße zwischen 2nm und 1000nm, vorzugsweise zwischen 10nm und 500nm, weiterhin vorzugsweise zwischen 15nm und 100nm auf. To form such thin layer thicknesses, the nanocrystals of the nanocrystalline metallic coating furthermore preferably have a particle size between 2 nm and 1000 nm, preferably between 10 nm and 500 nm, more preferably between 15 nm and 100 nm.
Des Weiteren wird die Verwendung einer nanokristallinen metallischen Beschichtung zur Erhöhung der Festigkeit und/oder der Temperaturbeständigkeit eines Gehäuseteils einer Kraftstoffhochdruckpumpe zumindest im Bereich einer mechanisch und/oder thermisch hoch belasteten Stelle beansprucht. Das Gehäuseteil ist dabei ein Kunststoff-Spritzgussteil aus einem thermoplastischen Werkstoff ist und die Beschichtung wird in einer Schichtstärke zwischen 25 und 200μιη aufgetragen. Auf diese Weise kann ein Kunststoff-Metall-Verbundkörper hergestellt werden, der die Vorteile der Werkstoffe Kunststoff und Metall in sich vereint. Der Kunststoff-Metall-Verbundkörper weist ein geringes Gewicht und - zumindest an den mit einer nanokristallinen metallischen Beschichtung versehenen Stellen - eine hohe Festigkeit und Temperaturbeständigkeit auf. Der Kunststoff- Grundkörper ist kostengünstig mittels Spritzgießen herstellbar. Das Spritzgießen ermöglicht zudem die Ausbildung komplexer Formen. Die Beschichtung wird vorzugsweise lediglich partiell aufgetragen, nämlich lediglich an den Stellen, die mechanisch und/oder thermisch hohen Beanspruchungen bzw. Belastungen ausgesetzt sind. Furthermore, the use of a nanocrystalline metallic coating to increase the strength and / or the temperature resistance of a housing part of a high-pressure fuel pump is claimed at least in the region of a mechanically and / or thermally highly stressed point. The housing part is a plastic injection molded part made of a thermoplastic material and the coating is applied in a layer thickness between 25 and 200μιη. In this way, a plastic-metal composite body can be produced, which combines the advantages of the materials plastic and metal in itself. The plastic-metal composite body has a low weight and - at least at the provided with a nanocrystalline metallic coating sites - high strength and temperature resistance. The plastic base body is inexpensive to produce by injection molding. Injection molding also allows the formation of complex shapes. The coating is preferably applied only partially, namely only at the locations which are subjected to high mechanical stresses and / or high thermal stresses.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnungen näher erläutert. Diese zeigen: An embodiment of the invention will be explained in more detail with reference to the drawings. These show:
Fig. 1 und 2 perspektivische Darstellungen eines Kunststoff-Spritzguss-1 and 2 are perspective views of a plastic injection molding
Gehäuses einer erfindungsgemäßen Kraftstoffhochdruckpumpe, Housing of a high-pressure fuel pump according to the invention,
Fig. 3 einen Schnitt durch das Kunststoff-Spritzguss-Gehäuse der Fig. 1 und 2. Ausführliche Beschreibung der Zeichnungen 3 shows a section through the plastic injection-molded housing of FIGS. 1 and 2. Detailed description of the drawings
Den perspektivischen Darstellungen der Figuren 1 und 2 ist ein Gehäuseteil 2 ei- nes Pumpengehäuses 1 einer Kraftstoffhochdruckpumpe mit einer Vielzahl vonThe perspective views of FIGS. 1 and 2 show a housing part 2 of a pump housing 1 of a high-pressure fuel pump with a multiplicity of
Bohrungen zu entnehmen. Die Bohrungen dienen vorrangig der Fluidführung oder der Aufnahme von Befestigungsmitteln. Darüber hinaus sind Bohrungen 5 vorgesehen, die jeweils der Aufnahme und Führung eines hubbeweglichen Stößels eines Pumpenelementes (nicht dargestellt) dienen. Durch die Hubbewegung des Stößels im Betrieb der Kraftstoffhochdruckpumpe werden die Bohrungen 5 auf Reibung beansprucht. Damit einher geht ein Temperaturanstieg, der eine zusätzliche Belastung des Gehäuseteils 2 im Bereich der Bohrung 5 darstellt. Zumindest bei den Bohrungen 5 handelt es sich somit um mechanische und thermisch hoch beanspruchte Stellen 3. In der Regel werden daher derartige Gehäu- seteile 2 aus Stahl oder Aluminium als Werkstoff gefertigt. Um Gewicht und Kosten einzusparen, handelt es sich bei dem in den Figuren 1 und 2 dargestellten Gehäuseteil 2 jedoch um ein Kunststoff-Spritzgussteil, das im Bereich der Bohrungen 5 mit einer nanokristallinen metallischen Beschichtung 4 zur Erhöhung der Festigkeit und der Temperaturbeständigkeit versehen ist (siehe auch Fig. 3). Remove holes. The holes serve primarily the fluid management or the inclusion of fasteners. In addition, bores 5 are provided which each serve to receive and guide a liftable plunger of a pump element (not shown). Due to the lifting movement of the plunger during operation of the high-pressure fuel pump, the holes 5 are subjected to friction. This is accompanied by a temperature increase, which represents an additional load on the housing part 2 in the region of the bore 5. At least at the holes 5 are thus mechanical and thermally highly stressed points 3. As a rule, therefore, such housing parts 2 are made of steel or aluminum as a material. In order to save weight and costs, however, the housing part 2 illustrated in FIGS. 1 and 2 is a plastic injection-molded part which is provided with a nanocrystalline metallic coating 4 in the region of the bores 5 in order to increase the strength and the temperature resistance (see also Fig. 3).
Die Ausbildung des Grundkörpers des Gehäuseteils 2 als Kunststoff- Spritzgussteil reduziert das Gewicht des Gehäuseteils 2 und vereinfacht die Realisierung komplexer Formen. Zugleich weist das Kunststoff-Spritzgussteil zumindest im Bereich der Bohrungen 5 aufgrund der nanokristallinen metallischen Be- Schichtung 4 eine ausreichende Festigkeit und Temperaturbeständigkeit auf.The formation of the main body of the housing part 2 as a plastic injection-molded part reduces the weight of the housing part 2 and simplifies the realization of complex shapes. At the same time, the plastic injection-molded part at least in the region of the holes 5 due to the nanocrystalline metallic coating 4 sufficient strength and temperature resistance.
Ferner steigt die Steifigkeit des Gehäuseteils 2. Furthermore, the rigidity of the housing part 2 increases.
Zur Erzielung der vorstehend genannten Wirkungen genügt bereits eine selektive, das heißt partielle Beschichtung des Gehäuseteils 2 lediglich im Bereich der mechanisch und/oder thermisch hoch beanspruchten Stellen 3. Dadurch können die Herstellungskosten weiter reduziert werden. Als mechanisch und/oder thermisch hoch beanspruchte Stellen 3 kommen neben den Bohrungen 5 zur Aufnahme der Stößel der Pumpenelemente weitere Bohrungen zur Fluidführung oder zur Aufnahme von Befestigungsmitteln in Frage. Schließlich kann es sich bei dem Gehäuseteil 2 auch um ein Flanschbauteil handeln, mittels dessen dieIn order to achieve the above-mentioned effects, a selective, that is to say partial, coating of the housing part 2 is already sufficient only in the area of the mechanically and / or thermally highly stressed areas 3. This can further reduce the production costs. As a mechanically and / or thermally highly stressed points 3 come next to the holes 5 for receiving the plunger of the pump elements further holes for fluid management or for receiving fasteners in question. Finally, the housing part 2 can also be a flange component, by means of which the
Kraftstoffhochdruckpumpe an einem Motorgehäuse oder dergleichen befestigbar ist. Stark beanspruchte Stellen 3 eines solchen Flanschbauteils stellen beispielsweise der Flansch, Teile der Innenoberfläche oder bestimmte Anschlusspunkte dar. Eine nanokristalline metallische Beschichtung kann demnach auf diese Stellen 3 beschränkt werden. Alternativ kann aber auch das gesamte Flanschbauteil mit einer nanokristallinen metallischen Beschichtung versehen sein. High-pressure fuel pump to a motor housing or the like fastened is. Heavily stressed points 3 of such a flange component represent, for example, the flange, parts of the inner surface or specific connection points. A nanocrystalline metallic coating can therefore be limited to these points 3. Alternatively, however, the entire flange component may also be provided with a nanocrystalline metallic coating.

Claims

Ansprüche claims
1 . Kraftstoffhochdruckpumpe einer Brennkraftmaschine mit einem Pumpengehäuse (1 ) zur Aufnahme wenigstens eines Pumpenelementes sowie einer Antriebswelle zur Betätigung des wenigstens einen Pumpenelementes, wobei das Pumpengehäuse (1 ) wenigstens ein aus Kunststoff gefertigtes Gehäuseteil (2) umfasst, 1 . High-pressure fuel pump of an internal combustion engine having a pump housing (1) for receiving at least one pump element and a drive shaft for actuating the at least one pump element, wherein the pump housing (1) comprises at least one made of plastic housing part (2),
dadurch gekennzeichnet, dass das aus Kunststoff gefertigte Gehäuseteil (2) zumindest im Bereich einer mechanisch und/oder thermisch hoch beanspruchten Stelle (3) eine die Festigkeit und/oder die Temperaturbeständigkeit erhöhende nanokristalline metallische Beschichtung (4) aufweist.  characterized in that the made of plastic housing part (2) at least in the region of a mechanically and / or thermally highly stressed point (3) has a strength and / or temperature resistance increasing nanocrystalline metallic coating (4).
2. Kraftstoffhochdruckpumpe nach Anspruch 1 , 2. High-pressure fuel pump according to claim 1,
dadurch gekennzeichnet, dass das aus Kunststoff gefertigte Gehäuseteil (2) eine Bohrung (5) zur Fluidführung und/oder zur Aufnahme eines hubbeweglichen Stößels, mittels welcher ein Pumpenkolben eines Pumpenelementes an der Antriebswelle abstützbar ist, umfasst, welche zumindest in einem Teilbereich eine die Festigkeit und/oder die Temperaturbeständigkeit erhöhende nanokristalline metallische Beschichtung (4) aufweist.  characterized in that the housing part (2) made of plastic comprises a bore (5) for fluid guidance and / or for receiving a liftable plunger, by means of which a pump piston of a pump element can be supported on the drive shaft, which at least in a partial region the strength and / or the temperature resistance-increasing nanocrystalline metallic coating (4).
3. Kraftstoffhochdruckpumpe nach Anspruch 1 oder 2, 3. high-pressure fuel pump according to claim 1 or 2,
dadurch gekennzeichnet, dass die nanokristalline metallische Beschichtung (4) Eisen, Nickel und/oder Titan enthält.  characterized in that the nanocrystalline metallic coating (4) contains iron, nickel and / or titanium.
4. Kraftstoffhochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die nanokristalline metallische Beschichtung (4) eine Schichtstärke zwischen 10 und 500μιη, vorzugsweise zwischen 20 und 250μιη, weiterhin vorzugsweise zwischen 25 und 200μιη aufweist. Kraftstoffhochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Nanokristalle der nanokristallinen metallischen Beschichtung (4) eine Korngröße zwischen 2nm und 1000nm, vorzugsweise zwischen 10nm und 500nm, weiterhin vorzugsweise zwischen 15nm und 100nm aufweisen. 4. High-pressure fuel pump according to one of the preceding claims, characterized in that the nanocrystalline metallic coating (4) has a layer thickness between 10 and 500μιη, preferably between 20 and 250μιη, further preferably between 25 and 200μιη. High-pressure fuel pump according to one of the preceding claims, characterized in that the nanocrystals of the nanocrystalline metallic coating (4) have a particle size between 2nm and 1000nm, preferably between 10nm and 500nm, further preferably between 15nm and 100nm.
Verwendung einer nanokristallinen metallischen Beschichtung (4) zur Erhöhung der Festigkeit und/oder der Temperaturbeständigkeit eines Gehäuseteils (2) einer Kraftstoffh och d ruckpumpe zumindest im Bereich einer mechanisch und/oder thermisch hoch belasteten Stelle (3), wobei das Gehäuseteil (2) ein Kunststoff-Spritzgussteil aus einem thermoplastischen Werkstoff ist und die Beschichtung in einer Schichtstärke zwischen 25 und 200μιη aufgetragen wird. Use of a nanocrystalline metallic coating (4) for increasing the strength and / or the temperature resistance of a housing part (2) of a fuel boost pump at least in the region of a mechanically and / or thermally highly stressed point (3), wherein the housing part (2) engages Plastic injection molded part made of a thermoplastic material and the coating is applied in a layer thickness between 25 and 200μιη.
PCT/EP2011/065074 2010-09-27 2011-09-01 High-pressure fuel pump WO2012041627A1 (en)

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EP11752528.7A EP2625417B1 (en) 2010-09-27 2011-09-01 High-pressure fuel pump
CN201180045756.2A CN103119284B (en) 2010-09-27 2011-09-01 The coating of the metal of high-pressure fuel pump and nanocrystal is in its application

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DE201010041425 DE102010041425A1 (en) 2010-09-27 2010-09-27 High-pressure fuel pump
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DE102014225794A1 (en) * 2014-12-15 2016-06-16 Robert Bosch Gmbh High-pressure pump and method for producing a high-pressure pump

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DE10322599A1 (en) * 2003-05-20 2004-12-09 Robert Bosch Gmbh High-pressure piston pump for internal combustion engine, comprises a housing, which consists of a fuel guiding part and a connecting part which is separate from the fuel guiding part
DE102008040351A1 (en) * 2008-07-11 2010-01-14 Robert Bosch Gmbh High pressure pump e.g. multi-piston high pressure pump, for use in e.g. common rail system, for racing application, has steel high pressure housing with extension engaged in retaining opening at main housing

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DE102010041425A1 (en) 2012-03-29
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EP2625417A1 (en) 2013-08-14

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