DE102010030852A1 - High pressure pump for common rail injection system utilized in vehicle for direct injection of fuel i.e. petrol, has pump piston whose axial hole comprises radial bore for connection with low pressure chamber and displacement chamber - Google Patents

High pressure pump for common rail injection system utilized in vehicle for direct injection of fuel i.e. petrol, has pump piston whose axial hole comprises radial bore for connection with low pressure chamber and displacement chamber Download PDF

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Publication number
DE102010030852A1
DE102010030852A1 DE201010030852 DE102010030852A DE102010030852A1 DE 102010030852 A1 DE102010030852 A1 DE 102010030852A1 DE 201010030852 DE201010030852 DE 201010030852 DE 102010030852 A DE102010030852 A DE 102010030852A DE 102010030852 A1 DE102010030852 A1 DE 102010030852A1
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Prior art keywords
pump
pressure
piston
pressure pump
fuel
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DE201010030852
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German (de)
Inventor
Oliver Gaertner
Wolfgang Schuller
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to DE201010030852 priority Critical patent/DE102010030852A1/en
Publication of DE102010030852A1 publication Critical patent/DE102010030852A1/en
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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
    • 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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F04B53/125—Reciprocating valves
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • F02M55/025—Common rails
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Abstract

The pump has multiple radial pump elements (3) e.g. differential piston pumps, arranged around a drive shaft (2) and received in a pump casing (1). The elements comprise a pump piston i.e. hollow piston, indirectly supported at a cam or an eccentric cam (5) of the shaft such that the piston is driven to a lifting movement through a rotation of the shaft. An axial hole of the piston comprises a radial bore for connecting with a low pressure chamber and a displacement chamber through an inlet valve. A high pressure seal is provided in the pump elements by plastic parts.

Description

Die Erfindung betrifft eine Hochdruckpumpe für ein Kraftstoffeinspritzsystem mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a high-pressure pump for a fuel injection system having the features of the preamble of claim 1.

Stand der TechnikState of the art

Eine Hochdruckpumpe der vorstehend genannten Art geht beispielsweise aus der Offenlegungsschrift DE 10 2008 042 881 A1 hervor. Die hierin angegebene Pumpenanordnung kann mehrere radial um einen auf einer Antriebswelle drehfest gelagerten Exzenter angeordnete Pumpenelemente umfassen, deren Aufgabe darin besteht, Kraftstoff zu verdichten und einem Einspritzsystem zuzuführen. Bei einem Common-Rail-Einspritzsystem führt die Hochdruckpumpe den verdichteten Kraftstoff zunächst einem gemeinsamen Hochdruckspeicher zu, dem sogenannten Rail. Von hier aus wird dann der Kraftstoff mittels Injektoren der Brennkammer zugeführt. Derartige Pumpenanordnungen mit radial um einen Exzenter oder Nocken angeordneten Pumpenelementen sind auch als Radialkolbenpumpen bekannt.A high pressure pump of the type mentioned above, for example, from the published patent application DE 10 2008 042 881 A1 out. The pump assembly recited herein may include a plurality of pump elements disposed radially about an eccentric shaft rotatably mounted on a drive shaft, the object of which is to compress and supply fuel to an injection system. In a common-rail injection system, the high-pressure pump initially supplies the compressed fuel to a common high-pressure accumulator, the so-called rail. From here, the fuel is then supplied by means of injectors of the combustion chamber. Such pump assemblies with radially arranged around an eccentric cam or pump elements are also known as radial piston pumps.

Ausgehend von einer Hochdruckpumpe der vorstehend genannten Art liegt der Erfindung die Aufgabe zu Grunde, ein alternatives Konzept für eine Hochdruckpumpe bereitzustellen. Insbesondere soll die erfindungsgemäße Hochdruckpumpe kostengünstig herzustellen sein und einen hohen Wirkungsgrad besitzen.Based on a high-pressure pump of the aforementioned type, the invention is based on the object to provide an alternative concept for a high-pressure pump. In particular, the high pressure pump according to the invention should be inexpensive to manufacture and have a high efficiency.

Die Aufgabe wird gelöst durch eine Hochdruckpumpe mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen dieser Hochdruckpumpe werden in den Unteransprüchen angegeben.The object is achieved by a high pressure pump with the features of claim 1. Advantageous developments of this high pressure pump are given in the dependent claims.

Offenbarung der ErfindungDisclosure of the invention

Die vorgeschlagene Hochdruckpumpe umfasst ein Pumpengehäuse, in dem mehrere radial um eine Antriebswelle angeordnete Pumpenelemente aufgenommen sind. Dabei umfasst jedes Pumpenelement einen Pumpenkolben, der zumindest mittelbar an einem Nocken oder Exzenter der Antriebswelle abgestützt ist, so dass der Pumpenkolben über eine Rotation der Antriebswelle zu einer Hubbwegung antreibbar ist. Erfindungsgemäß ist jeder Pumpenkolben als Hohlkolben ausgeführt und weist eine Axialbohrung auf, die über wenigstens eine Radialbohrung in Verbindung mit einem Niederdruckraum steht und über ein Zulaufventil mit einem Verdrängungsraum verbindbar ist.The proposed high pressure pump comprises a pump housing, in which a plurality of radially arranged around a drive shaft pump elements are accommodated. In this case, each pump element comprises a pump piston which is at least indirectly supported on a cam or eccentric of the drive shaft, so that the pump piston can be driven via a rotation of the drive shaft to a Hubbwegung. According to the invention, each pump piston is designed as a hollow piston and has an axial bore which is connected via at least one radial bore in connection with a low-pressure chamber and can be connected via an inlet valve with a displacement chamber.

Die Pumpenelemente der vorgeschlagenen Hochdruckpumpe weisen demnach Gemeinsamkeiten mit den Pumpenelementen einer Radialkolbenpumpe auf, die in Kraftfahrzeugen häufig im ESP-Bereich Einsatz findet. Diese sind im Vergleich zu den üblicherweise in einer Hochdruckpumpe eines Einspritzsystem eingesetzten Pumpenelementen kostengünstiger herzustellen. Der Einsatz zumindest ähnlicher Pumpenelemente in eine erfindungsgemäße Hochdruckpumpe verringert demnach die Herstellungskosten.The pump elements of the proposed high pressure pump accordingly have similarities with the pump elements of a radial piston pump, which is often used in motor vehicles in the ESP range. These are cheaper to produce compared to the pump elements usually used in a high pressure pump of an injection system. The use of at least similar pump elements in a high-pressure pump according to the invention accordingly reduces the production costs.

Vorzugsweise umfasst die Hochdruckpumpe zwei oder mehrere Pumpenelemente, da mit der Anzahl der Pumpenelemente auch die Fördermenge steigt. Ferner werden die Druckpulsationen auf das Rail oder einen sonstigen Hochdruckspeicher gemindert, dem der mittels der Pumpenelemente auf Hochdruck verdichtete Kraftstoff über eine oder mehere Leitungen zugeführt wird. Über die Anzahl der Pumpenelemente kann demnach auch die gewünschte Fördermenge eingestellt werden.Preferably, the high-pressure pump comprises two or more pump elements, since with the number of pump elements and the flow rate increases. Furthermore, the pressure pulsations are reduced to the rail or other high-pressure accumulator, which is supplied via the pump elements to high pressure compressed fuel via one or more lines. On the number of pump elements can therefore also the desired flow rate can be adjusted.

Gemäß einer bevorzugten Ausführungsform der Erfindung weist die Hochdruckpumpe einen Elektromotor zum Antrieb der Antriebswelle auf. Als unabhängiger Antrieb ermöglicht der Elektromotor, dass die Pumpe im Schubfall ausgeschaltet werden kann. Dadurch kann der Wirkunggrad der Hochdruckpumpe erhöht werden. Vorzugsweise ist der Elektromotor an das Pumpengehäuse angeflascht. Auf diese Weise ergibt sich eine kompakte Bauform. Alternativ kann der Antrieb der Hochdruckpumpe durch einen Fahrzeugmotor erfolgen, insbesondere über einen mit dem Fahrzeugmotor verbundenen Riemen- oder Kettentrieb oder ein Oldhamgetriebe.According to a preferred embodiment of the invention, the high-pressure pump has an electric motor for driving the drive shaft. As an independent drive, the electric motor allows the pump to be switched off in case of overrun. As a result, the degree of effect of the high-pressure pump can be increased. Preferably, the electric motor is flanged to the pump housing. In this way, results in a compact design. Alternatively, the drive of the high-pressure pump can be effected by a vehicle engine, in particular via a belt or chain drive connected to the vehicle engine or an Oldham transmission.

Weiterhin bevorzugt ist in das Pumpengehäuse der Hochdruckpumpe wenigstens eine Hochdruckspeicherleitung integriert, die vorzugsweise als Rail ausgebildet ist. Aus diesem Rail können die Injektoren zum Einspritzen des Kraftstoffs direkt mit Druck versorgt werden. Zur Integration des Rails in die Hochdruckpumpe kann dieses im Pumpengehäuse der Hochdruckpumpe aufgenommen oder an dieses angeflanscht sein.Further preferably, at least one high-pressure storage line is integrated in the pump housing of the high-pressure pump, which is preferably designed as a rail. From this rail, the injectors for injecting the fuel can be supplied directly with pressure. For integration of the rail in the high-pressure pump, this can be added to the pump housing of the high pressure pump or flanged to this.

Vorteilhafterweise sind die Pumpenelemente als Stufenkolbenpumpen ausgeführt. Stufenkolbenpumpen eignen sich besonders gut als Saugpumpe, da sie einen kontinuierlichen Saugfluss ermöglichen. Auf den Einsatz einer Elektrokraftstoffpumpe bzw. einer Vorförderpumpe kann somit unter Umständen verzichtet werden. Dies wirkt sich günstig auf die Kosten eines eine erfindungsgemäße Hochdruckpumpe aufweisenden Einspritzsystems aus.Advantageously, the pump elements are designed as stepped piston pumps. Stepped piston pumps are particularly suitable as a suction pump, as they allow a continuous suction flow. The use of an electric fuel pump or a prefeed pump can therefore be dispensed with under certain circumstances. This has a favorable effect on the costs of an injection system having a high-pressure pump according to the invention.

Um die Kosten weiter zu senken, wird ferner vorgeschlagen, dass die Hochdruckdichtung im Pumpenelement über den Einsatz von Kunststoffteilen erfolgt. Der Einsatz geschliffener und/oder gepaarter Kolben zur Hochdruckdichtung ist demnach entbehrlich. Durch diese Maßnahme können nicht nur Kosten, sondern auch Gewicht eingespart werden.In order to further reduce costs, it is further proposed that the high-pressure seal in the pump element be effected by the use of plastic parts. The use of polished and / or paired pistons for high-pressure seal is therefore unnecessary. By this measure, not only costs, but also weight can be saved.

Aufgrund der vorstehend genannten Vorteile eignet sich die erfindungsgemäße Hochdruckpumpe insbesondere für den Einsatz in Common-Rail-Einspritzsystemem oder für die Benzin-Direkteinspritzung. Due to the advantages mentioned above, the high-pressure pump according to the invention is particularly suitable for use in common-rail injection systems or for gasoline direct injection.

Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:

1 eine perspektivische Darstellung einer ersten Ausführungsform, 1 a perspective view of a first embodiment,

2 eine perspektivische Darstellung einer zweiten Ausführungsform, 2 a perspective view of a second embodiment,

3 sechs um eine Antriebswelle angeordnete Pumpenelemente einer erfindungsgemäßen Hochdruckpumpe sowie ein Diagramm zur Darstellung der Druckpulsationen einer solchen Pumpe gegenüber einer Pumpe mit zwei Pumpenelementen, 3 6 arranged around a drive shaft pump elements of a high-pressure pump according to the invention and a diagram illustrating the pressure pulsations of such a pump with respect to a pump with two pump elements,

4 einen Längsschnitt durch ein als Stufenkolbenpumpe ausgeführtes Pumpenelement sowie ein Diagramm zur Darstellung der Volumenströme saugseitig und druckseitig und 4 a longitudinal section through a designed as a stepped piston pump pump element and a graph showing the flow rates on the suction side and pressure side and

5 ein Diagramm zur Darstellung des Funktionsprinzips einer Einfachkolbenpumpe im Vergleich zu einer Stufenkolbenpumpe. 5 a diagram illustrating the principle of operation of a single-piston pump in comparison to a stepped piston pump.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Die in 1 dargestellte erfindungsgemäße Hochdruckpumpe weist ein Pumpengehäuse 1 auf, in welchem mehrere radial um eine Antriebswelle 2 angeordnete Pumpenelemente 3 aufgenommen sind. Die Antriebswelle 2 weist mehrere Exzenter 5 zum Antrieb der Pumpenelemente 3 auf. Insgesamt sind drei Exzenter 5 vorgesehen, die in axialer Richtung aufeinanderfolgend auf der Antriebswelle 2 angeordnet sind und denen jeweils zwei Pumpenelemente 3 zugeordnet sind. Jedes Pumpenelement 3 umfasst einen Pumpenkolben 4, der zmindest mittelbar an einem Exzenter 5 abgestützt ist. Ferner weist die Hochdruckpumpe einen Elektromotor 11 als unabhängigen Antrieb auf, so dass die Pumpe im Schubfall abgeschaltet werden kann.In the 1 illustrated high-pressure pump according to the invention has a pump housing 1 in which a plurality of radially about a drive shaft 2 arranged pump elements 3 are included. The drive shaft 2 has several eccentrics 5 for driving the pump elements 3 on. In total there are three eccentrics 5 provided in the axial direction successively on the drive shaft 2 are arranged and each of which two pump elements 3 assigned. Each pump element 3 includes a pump piston 4 , at least indirectly on an eccentric 5 is supported. Furthermore, the high-pressure pump has an electric motor 11 as an independent drive, so that the pump can be switched off in case of overrun.

Die Pumpenelemente 3 der Hochdruckpumpe fördern den über einen Zulauf 14 der Hochdruckpumpe zugeführten Kraftstoff auf Hochdruck, der dann über einen Railanschluss 15 dem Rail bzw. einer Hochdruckspeicherleitung 12 zugeführt wird. Vom Rail aus werden Kraftstoffinjektoren (nicht dargestellt) mit dem Hochdruck versorgt.The pump elements 3 the high-pressure pump promote the over an inlet 14 the high pressure pump fuel supplied to high pressure, which then via a rail connection 15 the rail or a high pressure storage line 12 is supplied. From the rail fuel injectors (not shown) are supplied with the high pressure.

Die in 2 dargestellte Hochdruckpumpe unterscheidet sich von der der 1 dadurch, dass an das Pumpengehäuse 1 ein Rail 12 angeflanscht ist. Durch die Integration der Hochdruckspeicherleitung 12 in die Hochdruckpumpe kann eine besonders kompakte Lösung geschaffen werden. Zudem werden Leitungswege eingespart. Der Zulauf 14 versorgt die Hochdruckpumpe weiterhin mit Kraftstoff, der Anschluss 16 ersetzt den Anschluss 15, da bei der Hochdruckpumpe der 2 die Injektoren direkt an die Hochdruckpumpe bzw. an das hierin integrierte Rail 12 angeschlossen werden.In the 2 shown high pressure pump differs from that of 1 in that to the pump housing 1 a rail 12 is flanged. By integrating the high-pressure accumulator line 12 In the high-pressure pump, a particularly compact solution can be created. In addition, lines are saved. The feed 14 continues to supply the high-pressure pump with fuel, the connection 16 replaces the connection 15 , because of the high pressure pump 2 the injectors directly to the high-pressure pump or to the rail integrated therein 12 be connected.

Die 3 zeigt eine Anordnung mehrere Pumpenelemente 3 um eine Antriebswelle 2. Im Unterschied zu den 1 und 2 sind hier jeweils drei Pumpenelemente 3 um einen Exzenter 5 angeordnet. Der Winkelabstand der Pumpenelemente 3 zueinander beträgt 120°, da sie im gleichen Winkelabstand zueinander angeordnet sind. Zudem sind mindestens zwei Exzenter 5 mit jeweils drei Pumpenelemente 3 hintereinander geschaltet. Dem Diagramm daneben sind zwei Kurven zu entnehmen, von denen die Kurve a die Druckpulsationen einer Hochdruckpumpe mit sechs Pumpenelementen 3 entsprechend der Darstellung und die Kurve b die Druckpulsationen einer Hochdruckpumpe mit zwei Pumpenelementen 3 wiedergibt. Es zeigt sich, dass die Druckpulsationen geringer ausfallen, wenn die Anzahl der Pumpenelemente 3 steigt.The 3 shows an arrangement of a plurality of pump elements 3 around a drive shaft 2 , Unlike the 1 and 2 here are each three pump elements 3 around an eccentric 5 arranged. The angular distance of the pump elements 3 each other is 120 °, since they are arranged at the same angular distance from each other. In addition, at least two eccentrics 5 each with three pump elements 3 connected in series. The graph next to two curves are shown, of which the curve a, the pressure pulsations of a high pressure pump with six pump elements 3 as shown and the curve b, the pressure pulsations of a high pressure pump with two pump elements 3 reproduces. It can be seen that the pressure pulsations are lower when the number of pump elements 3 increases.

Der 4 ist eine bevorzugte Ausführungsform eines Pumpenelementes 3 einer erfindungsgemäßen Hochdruckpumpe zu entnehmen. Der Pumpenkolben 4 des Pumpenelementes 3 ist als Stufenkolben mit einer Axialbohrung 6 ausgeführt, welche über wenigstens eine Radialbohrung 7 in Verbindung mit einem Niederdruckraum 8 steht. In den Niederdruckraum 8 gelangt der Kraftstoff über einen Zulauf 14. Die Axialbohrung 6 ist über ein Zulaufventil 9 mit einem Verdrängungsraum 10 verbindbar, in welchem der Kraftstoff verdichet und dann über ein Auslassventil 17 und eine Auslassbohrung 18 zum Railanschluss 15 gelangt. Die Ausbildung des Pumpenkolbens 4 als Stufenkolben weist den Vorteil auf, dass saugseitig ein kontinuierlicher Volumenstrom erreichbar ist (siehe Diagramm A; Diagramm B zeigt demgegenüber den druckseitigen Volmenstrom).Of the 4 is a preferred embodiment of a pump element 3 to take a high-pressure pump according to the invention. The pump piston 4 of the pump element 3 is as a stepped piston with an axial bore 6 executed, which via at least one radial bore 7 in conjunction with a low-pressure room 8th stands. In the low pressure room 8th the fuel passes through an inlet 14 , The axial bore 6 is via an inlet valve 9 with a crowding room 10 connectable, in which the fuel is compressed and then via an exhaust valve 17 and an outlet hole 18 to the rail connection 15 arrives. The formation of the pump piston 4 As a stepped piston has the advantage that the suction side, a continuous flow rate can be achieved (see diagram A, diagram B shows, in contrast, the pressure-side Volmenstrom).

Das Diagramm der 5 zeigt als Gegenüberstellung das Funktionsprinzip eines Pumpenelementes mit einem Einfachkolben (linke Spalte) und einem Stufenkolben (rechte Spalte) bei einer Drehung der Antriebswelle um 360°, d. h. während eines Saughubes (erste Zeile) und während eines Förderhubes (zweite Zeile). Die unterste Zeile gibt jeweils den gesamten Volumenstrom wieder, d. h. die Summe der ersten und zweiten Zeile. Diese zeigt deutlich, dass sich der Stufenkolben durch einen kontinuierlichen Volumenstrom auszeichnet.The diagram of 5 shows a comparison of the principle of operation of a pump element with a single piston (left column) and a stepped piston (right column) with a rotation of the drive shaft by 360 °, ie during a suction stroke (first line) and during a delivery stroke (second line). The bottom line represents the total volume flow, ie the sum of the first and second lines. This clearly shows that the stepped piston is characterized by a continuous volume flow.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 102008042881 A1 [0002] DE 102008042881 A1 [0002]

Claims (5)

Hochdruckpumpe für ein Kraftstoffeinspritzsystem mit einem Pumpengehäuse (1), in dem mehrere radial um eine Antriebswelle (2) angeordnete Pumpenelemente (3) aufgenommen sind, wobei jedes Pumpenelement (3) einen Pumpenkolben (4) umfasst, der zumindest mittelbar an einem Nocken oder Exzenter (5) der Antriebswelle (3) abgestützt ist, so dass der Pumpenkolben (4) über eine Rotation der Antriebswelle (3) zu einer Hubbwegung antreibbar ist, dadurch gekennzeichnet, dass jeder Pumpenkolben (4) als Hohlkolben ausgeführt ist und eine Axialbohrung (6) aufweist, die über wenigstens eine Radialbohrung (7) in Verbindung mit einem Niederdruckraum (8) steht und über ein Zulaufventil (9) mit einem Verdrängungsraum (10) verbindbar ist.High-pressure pump for a fuel injection system with a pump housing ( 1 ), in which several radially around a drive shaft ( 2 ) arranged pump elements ( 3 ), each pump element ( 3 ) a pump piston ( 4 ) which at least indirectly on a cam or eccentric ( 5 ) of the drive shaft ( 3 ) is supported, so that the pump piston ( 4 ) via a rotation of the drive shaft ( 3 ) is drivable to Hubbwegung, characterized in that each pump piston ( 4 ) is designed as a hollow piston and an axial bore ( 6 ), which via at least one radial bore ( 7 ) in conjunction with a low-pressure space ( 8th ) and via an inlet valve ( 9 ) with a displacement space ( 10 ) is connectable. Hochdruckpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Hochdruckpumpe einen Elektromotor (11) zum Antrieb der Antriebswelle (2) aufweist, wobei der Elektromotor (11) vorzugsweise an das Pumpengehäuse (1) angeflascht ist, oder, dass der Antrieb der Hochdruckpumpe durch einen Fahrzeugmotor erfolgt.High-pressure pump according to claim 1, characterized in that the high-pressure pump is an electric motor ( 11 ) for driving the drive shaft ( 2 ), wherein the electric motor ( 11 ) preferably to the pump housing ( 1 ), or that the drive of the high-pressure pump is performed by a vehicle engine. Hochdruckpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in das Pumpengehäuse (1) der Hochdruckpumpe wenigstens eine Hochdruckspeicherleitung (12) integriert ist, die vorzugsweise als Rail ausgebildet ist.High-pressure pump according to claim 1 or 2, characterized in that in the pump housing ( 1 ) of the high-pressure pump at least one high-pressure accumulator line ( 12 ) is integrated, which is preferably designed as a rail. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pumpenelemente (3) als Stufenkolbenpumpen ausgeführt sind.High-pressure pump according to one of the preceding claims, characterized in that the pump elements ( 3 ) are designed as stepped piston pumps. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Hochdruckdichtung im Pumpenelement über den Einsatz von Kunststoffteilen (13) erfolgt.High-pressure pump according to one of the preceding claims, characterized in that the high-pressure seal in the pump element via the use of plastic parts ( 13 ) he follows.
DE201010030852 2010-07-02 2010-07-02 High pressure pump for common rail injection system utilized in vehicle for direct injection of fuel i.e. petrol, has pump piston whose axial hole comprises radial bore for connection with low pressure chamber and displacement chamber Withdrawn DE102010030852A1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013141737A1 (en) * 2012-03-23 2013-09-26 Zuev Boris Konstantinovich Internal combustion engine
EP2679817A1 (en) * 2012-06-25 2014-01-01 Bell Helicopter Textron Inc. Variable radial fluid device with differential piston control
WO2014135313A1 (en) * 2013-03-07 2014-09-12 Robert Bosch Gmbh High-pressure pump for a fuel injection system
US9303638B2 (en) 2012-06-25 2016-04-05 Bell Helicopter Textron Inc. Variable radial fluid devices in series
US9399984B2 (en) 2012-06-25 2016-07-26 Bell Helicopter Textron Inc. Variable radial fluid device with counteracting cams
WO2019242985A1 (en) * 2018-06-20 2019-12-26 Robert Bosch Gmbh Pump assembly

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042881A1 (en) 2008-10-16 2010-04-22 Robert Bosch Gmbh High-pressure pump arrangement for common rail injection system of internal-combustion engine of motor vehicle, has eccentric cam adjustably arranged along axis perpendicular to shaft longitudinal axis

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042881A1 (en) 2008-10-16 2010-04-22 Robert Bosch Gmbh High-pressure pump arrangement for common rail injection system of internal-combustion engine of motor vehicle, has eccentric cam adjustably arranged along axis perpendicular to shaft longitudinal axis

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013141737A1 (en) * 2012-03-23 2013-09-26 Zuev Boris Konstantinovich Internal combustion engine
RU2609558C1 (en) * 2012-03-23 2017-02-02 Борис Константинович Зуев Internal combustion engine
EP2679817A1 (en) * 2012-06-25 2014-01-01 Bell Helicopter Textron Inc. Variable radial fluid device with differential piston control
US9228571B2 (en) 2012-06-25 2016-01-05 Bell Helicopter Textron Inc. Variable radial fluid device with differential piston control
US9303638B2 (en) 2012-06-25 2016-04-05 Bell Helicopter Textron Inc. Variable radial fluid devices in series
US9399984B2 (en) 2012-06-25 2016-07-26 Bell Helicopter Textron Inc. Variable radial fluid device with counteracting cams
WO2014135313A1 (en) * 2013-03-07 2014-09-12 Robert Bosch Gmbh High-pressure pump for a fuel injection system
CN105026753A (en) * 2013-03-07 2015-11-04 罗伯特·博世有限公司 High-pressure pump for a fuel injection system
CN105026753B (en) * 2013-03-07 2018-06-05 罗伯特·博世有限公司 For the high-pressure pump of fuel injection system
WO2019242985A1 (en) * 2018-06-20 2019-12-26 Robert Bosch Gmbh Pump assembly

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