EP2007986A1 - Radial piston pump for supplying fuel at high pressure to an internal combustion engine - Google Patents

Radial piston pump for supplying fuel at high pressure to an internal combustion engine

Info

Publication number
EP2007986A1
EP2007986A1 EP07727914A EP07727914A EP2007986A1 EP 2007986 A1 EP2007986 A1 EP 2007986A1 EP 07727914 A EP07727914 A EP 07727914A EP 07727914 A EP07727914 A EP 07727914A EP 2007986 A1 EP2007986 A1 EP 2007986A1
Authority
EP
European Patent Office
Prior art keywords
valve
radial piston
piston pump
suction valve
pressure
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.)
Withdrawn
Application number
EP07727914A
Other languages
German (de)
French (fr)
Inventor
Ngoc-Tam Vu
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
Continental Automotive 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 Siemens AG, Continental Automotive GmbH filed Critical Siemens AG
Publication of EP2007986A1 publication Critical patent/EP2007986A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • F04B1/0452—Distribution members, e.g. 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
    • F02M59/46—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
    • F02M59/44—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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F04B53/102—Disc valves
    • F04B53/1032—Spring-actuated disc valves

Definitions

  • the invention relates to a radial piston pump for high-pressure fuel supply in an internal combustion engine, with a displacer housing with compressor chamber, with in a cylinder chamber of a cylinder reciprocating piston, with a connected to a fuel supply line
  • Suction valve and having a connected to a fuel discharge line pressure valve, wherein the suction valve and the pressure ⁇ valve each have a closing head, a valve seat, a cylinder portion and springs.
  • the present invention seeks to provide a radial piston pump of the type mentioned, which is simpler in design and faster and cheaper to assemble.
  • suction valve and the pressure valve are identical assemblies, wherein the pressure valve is installed in the direction opposite to the suction valve flow direction in the radial piston pump.
  • the suction valve and the pressure valve are arranged axially parallel in the displacer ⁇ and connected to each other via an intermediate line.
  • the possibility that the fuel supply line to the suction valve and the fuel outflow line to the pressure valve at a distance are arranged parallel to each other in the displacer.
  • the intermediate line can be arranged between the compressor chamber and a feed line in the cylinder.
  • the closing head of the suction valve and of the pressure valve can each be designed in the form of a conical section and guided centrally in the valve seat.
  • the suction valve is strö ⁇ tion conveniently designed to optimize the dead space volume.
  • valve seat of the suction valve and the pressure valve are arranged in the end region of the displacer housing facing the cylinder.
  • seals may be in the end region and in the end region of the respective valve seats of the suction valve and the pressure valve are incorporated, so that no necessary elastomer seals in construction to the invention ⁇ OF INVENTION lent, since known metallic seals can be ⁇ sets.
  • the only figure 1 shows a section through a Radialkol ⁇ piston pump.
  • the radial piston pump shown in the drawing is used for high pressure fuel supply in an internal combustion engine, in particular in a common rail injection system.
  • This radial piston pump 1 has a displacer 3 and a da ⁇ with associated cylinder 30.
  • a reciprocating piston 6 In a cylinder chamber 5 of the cylinder 30 is a reciprocating piston 6, which can be driven for example by a known per se, not shown, eccentrically shaped drive shaft to produce the aforementioned reciprocating motion.
  • a suction valve 10 In the displacer housing 3 is a suction valve 10, wel ⁇ Ches is connected to a fuel supply line 8, and a pressure valve 12, which communicates with a fuel discharge line 14, preferably to a common rail injection system.
  • the suction valve 10 and the pressure valve 12 are identical assemblies, wherein - as is apparent from the drawing - the pressure valve 12 is installed in the suction valve 10 opposite set flow direction in the radial piston pump, in the present case in the displacer. 3
  • the suction valve 10 and the pressure valve 12 each have a closing head 16 or 16 ', a valve seat 18, 18', a cylinder portion 20, 20 'and springs 22, 22' on.
  • these individual elements of the assemblies are identical, in each case the closing head 16, 16 'in ⁇ the valves 10 and 12 in the form of a conical section is formed.
  • This closing head 16, 16 'of the suction valve 10 and the pressure valve 12 are guided centrally in the respective valve seat 18, 18'.
  • valve seats 18, 18 'of the suction valve 10 and of the pressure valve 12 are arranged in recesses in the cylinder 30 facing end region S of the displacer housing 3. It can be seen that the closing head 16 of the suction valve 10 extends ko ⁇ axially to the axis HH of the piston 6.
  • valve seats 18, 18 'can also serve as a seal between the lines 14 and 25 or 8 and 25 for accurate production.
  • valve seats 18, 18 'of the suction valve 10 and of the pressure valve 12 are each end side by seals 31, 31' and 32, 32 'in the end region S and in the end region of the respective valve seats 18, 18' of the suction valve 10 and the pressure valve 12 are sealed, where ⁇ at between the displacer housing 3 and the cylinder 30, a gap is present, which undergoes a seal by the aforementioned seals.
  • a pressure accumulator 40 can be arranged in at least one of the three displacers 3 of each pump on the high pressure side, which optionally serve as a buffer and / or as a high pressure accumulator in the sense of a common rail in connection with the other pressure lines can.
  • the construction according to the invention is designed to generally below the cylinder 30 provided the unspecified Darge ⁇ pump housing is arranged, which usually three of the cylinder assemblies shown in a star-shaped arrangement (ie 120 degrees) comprises.
  • the high-pressure fuel is summarized after leaving the pressure valve 12 of each cylinder assembly and passed through the aforementioned pump housing. So far, this had to be designed for high pressure. Now there is the possibility that this merger no longer takes place in the pump housing but, for example, by an outer ring line which no longer runs through the pump housing. Therefore, this pump housing may be made weaker, such as aluminum, and thus made lighter and cheaper.
  • the operation of the radial piston pump according to the invention is such that fuel flows through the fuel supply line 8 via the open suction valve 10 into the compressor chamber 4, there undergoes a compression by the piston 6, via the intermediate line 25 and the supply line 28 via the against the effect of Spring 22 'open pressure valve 12 to the fuel discharge line 14 and is passed from here to a common rail injection system, not shown.

Abstract

The invention relates to a radial piston pump (1) for supplying fuel at high-pressure to an internal combustion engine, comprising a displacement housing (3) equipped with a compression chamber (4), a reciprocating piston which is arranged in a cylinder chamber (5) of a cylinder (30), a suction valve (10) which is connected to a fuel supply line (8) and a pressure valve (12) which is connected to a fuel outlet line (14). Said suction valve (10) and the pressure valve (12) comprise, respectively, a closing head (16, 16'), a valve seat (18, 18'), a cylinder section (20, 20') and springs (22, 22'). The suction valve (10) and the pressure valve (12) are identical components and the pressure valve (12) is incorporated into the radial piston pump (1) in the direction of flow counter to the suction valve (10).

Description

Beschreibungdescription
Radialkolbenpumpe zur Kraftstoff-Hochdruckversorgung bei einer BrennkraftmaschineRadial piston pump for fuel high pressure supply in an internal combustion engine
Die Erfindung bezieht sich auf eine Radialkolbenpumpe zur Kraftstoff-Hochdruckversorgung bei einer Brennkraftmaschine, mit einem Verdrängergehäuse mit Verdichterraum, mit in einem Zylinderraum eines Zylinders hin- und herbewegbaren Kolben, mit einem mit einer Kraftstoff-Zulaufleitung verbundenenThe invention relates to a radial piston pump for high-pressure fuel supply in an internal combustion engine, with a displacer housing with compressor chamber, with in a cylinder chamber of a cylinder reciprocating piston, with a connected to a fuel supply line
Saugventil und mit einem mit einer Kraftstoff-Abströmleitung verbundenen Druckventil, wobei das Saugventil und das Druck¬ ventil jeweils einen Schließkopf, einen Ventilsitz, einen Zylinderabschnitt und Federn aufweisen.Suction valve and having a connected to a fuel discharge line pressure valve, wherein the suction valve and the pressure ¬ valve each have a closing head, a valve seat, a cylinder portion and springs.
Als Stand der Technik ist bereits eine derartige Radialkol¬ benpumpe bekannt, bei welcher das Saugventil im Verdrängerge¬ häuse und das Druckventil im Zylinder angeordnet sind und beide Ventile im rechten Winkel zueinander stehen (DE 102 28 552) . Darüber hinaus weisen das Saugventil und das Druckven¬ til unterschiedliche Baugestaltungen auf. Hierdurch ergibt sich ein erheblicher Aufwand, und zwar sowohl hinsichtlich der spezifischen Gestaltung des Saugventils und des Druckventils als auch bezüglich der Montage dieser beiden Ventilein- heiten. Eine ähnliche Gestaltung weist auch eine weitere Ra¬ dialkolbenpumpe mit dem vorerwähnten Nachteilen auf (DE 103 10 123) .As prior art, such Radialkol ¬ benpumpe is already known, in which the suction valve in Verdrängerge ¬ housing and the pressure valve in the cylinder are arranged and both valves at right angles to each other (DE 102 28 552). In addition, the suction valve and the Druckven ¬ til different building designs. This results in a considerable effort, both in terms of the specific design of the suction valve and the pressure valve and with respect to the installation of these two Ventilein- units. A similar design also has another Ra ¬ dialkolbenpumpe with the aforementioned disadvantages (DE 103 10 123).
Auch weitere, zum Stand der Technik zählenden Radialkolben- pumpen sind mit den vorgenannten Nachteilen kostenaufwändig aufgebaut (DE 102 43 148, DE 10 2004 028 073) .Other radial piston pumps belonging to the state of the art are also costly with the aforementioned disadvantages (DE 102 43 148, DE 10 2004 028 073).
Entsprechend liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Radialkolbenpumpe der Eingangs genannten Art zu schaffen, welche einfacher aufgebaut und schneller und kostengünstiger zu montieren ist.Accordingly, the present invention seeks to provide a radial piston pump of the type mentioned, which is simpler in design and faster and cheaper to assemble.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Saugventil und das Druckventil identische Baugruppen sind, wobei das Druckventil im zum Saugventil entgegengesetzter Strömungsrichtung in der Radialkolbenpumpe eingebaut ist. Hierdurch ergibt sich der Vorteil, dass eine erhebliche Redu¬ zierung der Baugruppen möglich ist, es liegt also eine kos- tengünstige Konstruktion vor. Weiterhin resultiert aus dieser erfindungsgemäßen Konstruktion eine verbesserte Montagemöglichkeit, da lediglich das Druckventil im zum Saugventil ent¬ gegengesetzten Sinne in die Radialkolbenpumpe eingebaut wer¬ den muss .This object is achieved in that the suction valve and the pressure valve are identical assemblies, wherein the pressure valve is installed in the direction opposite to the suction valve flow direction in the radial piston pump. This results in the advantage that a considerable Redu ¬ cation of the modules is possible, so there is a cost-effective design before. Furthermore, results from this construction according to the invention an improved mounting option, since only the pressure valve in the suction valve ent ¬ opposite sense incorporated in the radial piston pump who ¬ must.
In weiterer Ausgestaltung der Erfindung sind das Saugventil und das Druckventil achsparallel im Verdrängergehäuse ange¬ ordnet und über eine Zwischenleitung miteinander verbunden. Hierbei besteht in weiterer Ausgestaltung der Erfindung die Möglichkeit, dass die Kraftstoff-Zulaufleitung zum Saugventil und die Kraftstoff-Abströmleitung zum Druckventil im Abstand parallel voneinander im Verdrängergehäuse angeordnet sind.In a further embodiment of the invention, the suction valve and the pressure valve are arranged axially parallel in the displacer ¬ and connected to each other via an intermediate line. In this case, in a further embodiment of the invention, the possibility that the fuel supply line to the suction valve and the fuel outflow line to the pressure valve at a distance are arranged parallel to each other in the displacer.
Nach einem anderen Merkmal der Erfindung kann die Zwischen- leitung zwischen dem Verdichterraum und einer Zuleitung im Zylinder angeordnet sein.According to another feature of the invention, the intermediate line can be arranged between the compressor chamber and a feed line in the cylinder.
Eine weitere Vereinfachung der Bauform und eine strömungs¬ günstige Lösung ergibt sich daraus, dass der Schließkopf des Saugventils koaxial zur Achse des Kolbens angeordnet ist.A further simplification of the design and a flow ¬ favorable solution results from the fact that the closing head of the suction valve is arranged coaxially to the axis of the piston.
Hierbei kann der Schließkopf des Saugventils und des Druckk- ventils jeweils in Form eines Kegelabschnitts ausgebildet und mittig im Ventilsitz geführt sein. Das Saugventil ist strö¬ mungsgünstig gestaltet mit Optimierung des Totraumvolumens .In this case, the closing head of the suction valve and of the pressure valve can each be designed in the form of a conical section and guided centrally in the valve seat. The suction valve is strö ¬ tion conveniently designed to optimize the dead space volume.
Nach einem anderen Merkmal der Erfindung sind jeweils der Ventilsitz des Saugventils und des Druckventils in dem dem Zylinder zugewandten Stirnbereich des Verdrängergehäuses angeordnet. Darüber hinaus können Dichtungen im Stirnbereich und im Endbereich der jeweiligen Ventilsitze des Saugventils und des Druckventils eingebaut werden, so dass bei der erfin¬ dungsgemäßen Konstruktion keine Elastomerdichtungen erforder- lieh sind, da an sich bekannte metallische Dichtungen einge¬ setzt werden können.According to another feature of the invention, in each case the valve seat of the suction valve and the pressure valve are arranged in the end region of the displacer housing facing the cylinder. In addition, seals may be in the end region and in the end region of the respective valve seats of the suction valve and the pressure valve are incorporated, so that no necessary elastomer seals in construction to the invention ¬ OF INVENTION lent, since known metallic seals can be ¬ sets.
Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher beschrieben.The invention will be described in more detail with reference to an embodiment shown in the drawing.
Die einzige Figur 1 zeigt einen Schnitt durch eine Radialkol¬ benpumpe .The only figure 1 shows a section through a Radialkol ¬ piston pump.
Die in der Zeichnung dargestellte Radialkolbenpumpe dient zur Kraftstoff-Hochdruckversorgung bei einer Brennkraftmaschine, insbesondere bei einem Common-Rail-Einspritzsystem. Diese Radialkolbenpumpe 1 weist ein Verdrängergehäuse 3 und einen da¬ mit verbundenen Zylinder 30 auf. In einem Zylinderraum 5 des Zylinders 30 befindet sich ein hin- und herbewegbarer Kolben 6, welcher beispielsweise durch eine an sich bekannte, nicht näher dargestellte, exzentrisch ausgebildete Antriebswelle angetrieben werden kann, um die vorerwähnte Hin- und Herbewegung zu erzeugen.The radial piston pump shown in the drawing is used for high pressure fuel supply in an internal combustion engine, in particular in a common rail injection system. This radial piston pump 1 has a displacer 3 and a da ¬ with associated cylinder 30. In a cylinder chamber 5 of the cylinder 30 is a reciprocating piston 6, which can be driven for example by a known per se, not shown, eccentrically shaped drive shaft to produce the aforementioned reciprocating motion.
Im Verdrängergehäuse 3 befindet sich ein Saugventil 10, wel¬ ches mit einer Kraftstoff-Zulaufleitung 8 verbunden ist, sowie ein Druckventil 12, das mit einer Kraftstoff-Abströmleitung 14, vorzugsweise zu einem Common-Rail-Einspritz- System, in Verbindung steht.In the displacer housing 3 is a suction valve 10, wel ¬ Ches is connected to a fuel supply line 8, and a pressure valve 12, which communicates with a fuel discharge line 14, preferably to a common rail injection system.
Erfindungsgemäß sind das Saugventil 10 und das Druckventil 12 identische Baugruppen, wobei - wie aus der Zeichnung hervorgeht - das Druckventil 12 in zum Saugventil 10 entgegenge- setzten Strömungsrichtung in die Radialkolbenpumpe eingebaut ist, im vorliegenden Fall in das Verdrängergehäuse 3.According to the invention, the suction valve 10 and the pressure valve 12 are identical assemblies, wherein - as is apparent from the drawing - the pressure valve 12 is installed in the suction valve 10 opposite set flow direction in the radial piston pump, in the present case in the displacer. 3
Aus der Zeichnung ist darüber hinaus erkennbar, dass das Saugventil 10 und das Druckventil 12 achsparallel im Verdrän- gergehäuse 3 angeordnet und über eine Zwischenleitung 25 mit¬ einander verbunden sind. Diese Zwischenleitung 25 befindet sich im Zylinder 30, und zwar zwischen einem Verdichterraum 4 und einer Zuleitung 28 zu dem Druckventil 14. Der Verdichter- räum 4 befindet sich oberhalb des in dem Zylinderraum 5 hin- und herbewegbaren Kolben 6.From the drawing it that the suction valve 10 and the pressure valve 12 arranged axially parallel in the positive displacement gergehäuse 3 and are connected via an intermediate line 25 having ¬ each other is also seen. This intermediate line 25 is located in the cylinder 30, between a compressor chamber 4 and a supply line 28 to the pressure valve 14. The compressor raum 4 is located above the in the cylinder chamber 5 reciprocable piston. 6
Das Saugventil 10 und das Druckventil 12 weisen jeweils einen Schließkopf 16 bzw. 16', einen Ventilsitz 18, 18', einen Zylinderabschnitt 20, 20' und Federn 22, 22' auf. Wie aus der Zeichnung ersichtlich, sind diese einzelnen Elemente der Baugruppen identisch, wobei jeweils der Schließkopf 16, 16' bei¬ der Ventile 10 und 12 in Form eines Kegelabschnitts ausgebil- det ist. Dieser Schließkopf 16, 16' des Saugventils 10 und des Druckventils 12 sind mittig im jeweiligen Ventilsitz 18, 18' geführt.The suction valve 10 and the pressure valve 12 each have a closing head 16 or 16 ', a valve seat 18, 18', a cylinder portion 20, 20 'and springs 22, 22' on. As can be seen from the drawing, these individual elements of the assemblies are identical, in each case the closing head 16, 16 'in ¬ the valves 10 and 12 in the form of a conical section is formed. This closing head 16, 16 'of the suction valve 10 and the pressure valve 12 are guided centrally in the respective valve seat 18, 18'.
Die Ventilsitze 18, 18' des Saugventils 10 und des Druckven- tils 12 sind in Ausnehmungen in dem Zylinder 30 zugewandten Stirnbereich S des Verdrängergehäuses 3 angeordnet. Hierbei ist erkennbar, dass der Schließkopf 16 des Saugventils 10 ko¬ axial zur Achse H-H des Kolbens 6 verläuft.The valve seats 18, 18 'of the suction valve 10 and of the pressure valve 12 are arranged in recesses in the cylinder 30 facing end region S of the displacer housing 3. It can be seen that the closing head 16 of the suction valve 10 extends ko ¬ axially to the axis HH of the piston 6.
Diese Ventilsitze 18, 18' können bei genauer Fertigung auch als Dichtung zwischen den Leitungen 14 und 25 bzw. 8 und 25 dienen .These valve seats 18, 18 'can also serve as a seal between the lines 14 and 25 or 8 and 25 for accurate production.
Alternativ besteht die Möglichkeit, dass die Ventilsitze 18, 18' des Saugventils 10 und des Druckventils 12 jeweils end- seitig durch Dichtungen 31, 31' bzw. 32, 32' im Stirnbereich S und im Endbereich der jeweiligen Ventilsitze 18, 18' des Saugventils 10 und des Druckventils 12 abgedichtet sind, wo¬ bei zwischen dem Verdrängergehäuse 3 und dem Zylinder 30 ein Spalt vorhanden ist, der durch die vorgenannten Dichtungen eine Abdichtung erfährt .Alternatively, there is the possibility that the valve seats 18, 18 'of the suction valve 10 and of the pressure valve 12 are each end side by seals 31, 31' and 32, 32 'in the end region S and in the end region of the respective valve seats 18, 18' of the suction valve 10 and the pressure valve 12 are sealed, where ¬ at between the displacer housing 3 and the cylinder 30, a gap is present, which undergoes a seal by the aforementioned seals.
Wie aus der einzigen Zeichnung hervorgeht, kann in wenigstens einem der drei Verdrängergehäuse 3 jeder Pumpe hochdrucksei- tig ein Druckspeicher 40 angeordnet sein, welcher gegebenenfalls in Verbindung mit den anderen Druckleitungen als Puffer und/oder als Hochdruck-Vorratsspeicher im Sinne eines Common- Rail dienen kann. Die erfindungsgemäße Konstruktion ist so gestaltet, dass im allgemeinen unterhalb des Zylinders 30 das nicht näher darge¬ stellte Pumpengehäuse angeordnet ist, welches meist drei der dargestellten Zylinderanordnungen in sternförmiger Anordnung (d. h. 120 Grad) umfasst.As can be seen from the single drawing, a pressure accumulator 40 can be arranged in at least one of the three displacers 3 of each pump on the high pressure side, which optionally serve as a buffer and / or as a high pressure accumulator in the sense of a common rail in connection with the other pressure lines can. The construction according to the invention is designed to generally below the cylinder 30 provided the unspecified Darge ¬ pump housing is arranged, which usually three of the cylinder assemblies shown in a star-shaped arrangement (ie 120 degrees) comprises.
Bisher wird der Hochdruck-Kraftstoff nach dem Verlassen des Druckventils 12 jeder Zylinderanordnung zusammengefasst und durch das vorgenannte Pumpengehäuse geführt. Dieses musste also bisher auch für Hochdruck ausgelegt werden. Nunmehr besteht die Möglichkeit, dass diese Zusammenlegung nicht mehr im Pumpengehäuse, sondern beispielsweise durch eine äußere Ringleitung erfolgt, welche nicht mehr durch das Pumpengehäu- se läuft. Daher kann dieses Pumpengehäuse schwächer gestaltet sein, beispielsweise aus Aluminium, und damit leichter und billiger hergestellt werden.So far, the high-pressure fuel is summarized after leaving the pressure valve 12 of each cylinder assembly and passed through the aforementioned pump housing. So far, this had to be designed for high pressure. Now there is the possibility that this merger no longer takes place in the pump housing but, for example, by an outer ring line which no longer runs through the pump housing. Therefore, this pump housing may be made weaker, such as aluminum, and thus made lighter and cheaper.
Die Arbeitsweise der erfindungsgemäßen Radialkolbenpumpe ist so, dass Kraftstoff durch die Kraftstoff-Zulaufleitung 8 über das geöffnete Saugventil 10 in den Verdichterraum 4 strömt, dort durch den Kolben 6 eine Verdichtung erfährt, über die Zwischenleitung 25 und die Zuleitung 28 über das gegen die Wirkung der Feder 22' geöffnete Druckventil 12 zur Kraft- stoff-Abströmleitung 14 und von hier zu einem nicht näher dargestellten Common-Rail-Einspritzsystem geleitet wird.The operation of the radial piston pump according to the invention is such that fuel flows through the fuel supply line 8 via the open suction valve 10 into the compressor chamber 4, there undergoes a compression by the piston 6, via the intermediate line 25 and the supply line 28 via the against the effect of Spring 22 'open pressure valve 12 to the fuel discharge line 14 and is passed from here to a common rail injection system, not shown.
Durch die besondere Gestaltung des Saugventils 10 und des Druckventils 12 und ihrer besonderen Anordnung in dem Verdrängergehäuse 3 ergibt sich eine erhebliche Vereinfachung in der Konstruktion und eine Reduzierung der Montagekosten. Es liegt eine strömungsgünstige Anordnung mit einer konstruk¬ tiv einfachen Ausbildung der einzelnen Bauteile und einer Verbesserung der Abdichtfunktionen vor. Due to the special design of the suction valve 10 and the pressure valve 12 and their special arrangement in the displacer 3 results in a considerable simplification in the design and a reduction in assembly costs. There is a streamlined arrangement with a constructive ¬ tively simple design of the individual components and an improvement of Abdichtfunktionen.

Claims

Patentansprüche claims
1. Radialkolbenpumpe (1) zur Kraftstoff-Hochdruckversorgung bei einer Brennkraftmaschine,1. Radial piston pump (1) for high-pressure fuel supply in an internal combustion engine,
mit einem Verdrängergehäuse (3) mit Verdichterraum (4),with a displacer housing (3) with a compressor chamber (4),
mit in einem Zylinderraum (5) eines Zylinders (30) hin- und herbewegbaren Kolben (6) ,with piston (6) reciprocable in a cylinder space (5) of a cylinder (30),
mit einem mit einer Kraftstoff-Zulaufleitung (8) verbundenen Saugventil (10) undwith a with a fuel supply line (8) connected to the suction valve (10) and
mit einem mit einer Kraftstoff-Abströmleitung (14) ver- bundenen Druckventil (12),with a pressure valve (12) connected to a fuel outflow line (14),
wobei das Saugventil (10) und das Druckventil (12) je¬ weils einen Schließkopf (16, 16'), einen Ventilsitz (18, 18'), einen Zylinderabschnitt (20, 20') und Federn (22, 22') aufweisen,wherein the suction valve (10) and the pressure valve (12) depending ¬ Weil a closing head (16, 16 '), a valve seat (18, 18'), a cylinder portion (20, 20 ') and springs (22, 22') .
dadurch gekennzeichnet, dasscharacterized in that
das Saugventil (10) und das Druckventil (12) identische Baugruppen sind undthe suction valve (10) and the pressure valve (12) are identical assemblies and
dass das Druckventil (12) in zum Saugventil (10) entge¬ gengesetzter Strömungsrichtung in der Radialkolbenpumpe (1) eingebaut ist.that the pressure valve (12) to the suction valve is installed (10) entge ¬ gengesetzter flow direction in the radial piston pump (1).
2. Radialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, dass das Saugventil (10) und das Druckventil (12) achsparallel im Verdrängergehäuse (3) angeordnet ist, wobei beide Ventile über eine Zwischenleitung (25) mit- einander verbunden sind.2. Radial piston pump according to claim 1, characterized in that the suction valve (10) and the pressure valve (12) is arranged axially parallel in the displacer housing (3), wherein both valves via an intermediate line (25) are interconnected.
3. Radialkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, dass die Kraftstoff-Zulaufleitung (8) zum Saugven- til (10) und die Kraftstoff-Abströmleitung (14) vom Druckventil (12) im Abstand parallel voneinander im Verdrängergehäuse (3) angeordnet sind.3. Radial piston pump according to claim 2, characterized in that the fuel supply line (8) for Saugven- Til (10) and the fuel discharge line (14) from the pressure valve (12) in the distance parallel to each other in the displacer housing (3) are arranged.
4. Radialkolbenpumpe nach Anspruch 2 und 3, dadurch gekennzeichnet, dass die Zwischenleitung (25) zwischen dem Verdichterraum (4) und einer Zuleitung (28) im Zylinder (30) angeordnet ist.4. Radial piston pump according to claim 2 and 3, characterized in that the intermediate line (25) between the compressor chamber (4) and a supply line (28) in the cylinder (30) is arranged.
5. Radialkolbenpumpe nach einem oder mehreren der vorherge¬ henden Ansprüche, dadurch gekennzeichnet, dass der Schließkopf (16) des Saugventils (10) koaxial zur Achse (H-H) des Kolbens (6) angeordnet ist.5. Radial piston pump according to one or more of the preceding ¬ Henden claims, characterized in that the closing head (16) of the suction valve (10) coaxial to the axis (HH) of the piston (6).
6. Radialkolbenpumpe nach einem oder mehreren der vorherge¬ henden Ansprüche, dadurch gekennzeichnet, dass der Schließkopf (16, 16') des Saugventils (10) und des Druckkventils (12) jeweils in Form eines Kegelabschnitts ausgebildet und mittig im Ventilsitz (18, 18') geführt ist.6. Radial piston pump according to one or more of the preceding ¬ Henden claims, characterized in that the closing head (16, 16 ') each formed of the suction valve (10) and the Druckkventils (12) in the form of a cone portion and the center of the valve seat (18, 18 ') is guided.
7. Radialkolbenpumpe nach einem oder mehreren der vorherge¬ henden Ansprüche, dadurch gekennzeichnet, dass jeweils der Ventilsitz (18, 18') des Saugventils (10) und des Druckventils (14) in dem dem Zylinder (30) zugewandten Stirnbereich (S) des Verdrängergehäuses (3) angeordnet sind.7. Radial piston pump according to one or more of the preceding ¬ Henden claims, characterized in that each of the valve seat (18, 18 ') in the region facing the suction valve (10) and the pressure valve (14) to the cylinder (30) end region (S) of the Displacer housing (3) are arranged.
8. Radialkolbenpumpe nach Anspruch 7, gekennzeichnet durch Dichtungen (31, 31', 32, 32') im Stirnbereich (S) und im8. Radial piston pump according to claim 7, characterized by seals (31, 31 ', 32, 32') in the front region (S) and in
Endbereich der jeweiligen Ventilsitze (18, 18') des Saugventils (10) und des Druckventils (12) .End portion of the respective valve seats (18, 18 ') of the suction valve (10) and the pressure valve (12).
9. Radialkolbenpumpe nach einem oder mehreren der vorherge- henden Ansprüche, dadurch gekennzeichnet, dass in min¬ destens einem Verdrängehrgehäuse (3) ein Druckspeicher9. Radial piston pump according to one or more of the preceding claims, characterized in that in min ¬ least one Verdrängehrgehäuse (3) a pressure accumulator
(40) als Puffer und/oder als Hochdruck-Vorratsspeicher angeordnet ist. (40) is arranged as a buffer and / or as a high pressure accumulator.
10. Radialkolbenpumpe nach einem oder mehreren der vorherge¬ henden Ansprüche, dadurch gekennzeichnet, dass die Kraftstoff-Abströmleitungen (14) mehrere Radialkolben- pumpeneinheiten durch eine äußere Ringleitung zusammen- gefasst sind. 10. Radial piston pump are summarized according to one or more of the preceding ¬ Henden claims, characterized in that the fuel outflow lines (14) pump units several radial piston by an outer ring line.
EP07727914A 2006-04-11 2007-04-10 Radial piston pump for supplying fuel at high pressure to an internal combustion engine Withdrawn EP2007986A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006017036A DE102006017036A1 (en) 2006-04-11 2006-04-11 Radial piston pump for fuel high pressure supply in an internal combustion engine
PCT/EP2007/053446 WO2007116048A1 (en) 2006-04-11 2007-04-10 Radial piston pump for supplying fuel at high pressure to an internal combustion engine

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EP2007986A1 true EP2007986A1 (en) 2008-12-31

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US (1) US7748966B2 (en)
EP (1) EP2007986A1 (en)
JP (1) JP4976484B2 (en)
DE (1) DE102006017036A1 (en)
WO (1) WO2007116048A1 (en)

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Also Published As

Publication number Publication date
JP4976484B2 (en) 2012-07-18
US20090272364A1 (en) 2009-11-05
DE102006017036A1 (en) 2007-10-18
US7748966B2 (en) 2010-07-06
WO2007116048A1 (en) 2007-10-18
JP2009533593A (en) 2009-09-17

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