EP1269021B1 - Radial piston pump - Google Patents
Radial piston pump Download PDFInfo
- Publication number
- EP1269021B1 EP1269021B1 EP00987099A EP00987099A EP1269021B1 EP 1269021 B1 EP1269021 B1 EP 1269021B1 EP 00987099 A EP00987099 A EP 00987099A EP 00987099 A EP00987099 A EP 00987099A EP 1269021 B1 EP1269021 B1 EP 1269021B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suction valve
- drive shaft
- controlled
- piston pump
- radial piston
- 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.)
- Expired - Lifetime
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Classifications
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- 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
- F04B53/1022—Disc valves having means for guiding the closure member axially
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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
- F02M59/02—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
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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
- 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
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- 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
Definitions
- the invention relates to a radial piston pump for High-pressure fuel production in fuel injection systems of internal combustion engines, in particular in a common rail Injection system, with one rotatable in a pump housing mounted drive shaft which is eccentric and with several, in particular three, with respect to Drive shaft radially in a respective element bore arranged piston cooperates by turning the Drive shaft in the respective element bore in radial Direction are reciprocable and one each Cylinder space limit, via a suction valve with a Low pressure space communicates.
- Common-rail injection systems promotes a High pressure pump with the aid of a feed pump the Fuel to be injected from a fuel tank in a central high-pressure fuel storage, as Common rail is called. Lead by the rail Fuel lines to the individual injectors, the Cylinders of the internal combustion engine are assigned. The Injectors are dependent on the Operating parameters of the internal combustion engine individually from the Engine electronics driven to fuel in the combustion chamber to inject the internal combustion engine.
- a radial piston pump can be used as they are, for example, in the unpublished DE 198 48 035 is described.
- a Radial piston pump forms a piston with the associated Cylinder space each have a pump element through which the pumped fuel is subjected to high pressure.
- the Flow rate of the radial piston pump can with the help of a Metering unit to the respective needs of Internal combustion engine to be adjusted. Then in the Radial piston pump only as much fuel compressed as actually needed.
- an on the suction side of the radial piston pump provided adjustable throttle can be used. As a result, that the individual cylinder chambers in operation at a low flow rate can not be completely filled.
- a radial piston pump with the features of the preamble of claim 1 is made WO 99/02857 known.
- the object of the invention is a radial piston pump to provide an equal promotion of each Guaranteed pump elements and inexpensive to produce is.
- the task is with a radial piston pump for High-pressure fuel production in fuel injection systems of internal combustion engines, in particular in a common rail injection system, rotatable with one in a pump housing mounted drive shaft which is eccentric and with several, in particular three, with respect to Drive shaft radially in a respective element bore arranged piston cooperates by turning the Drive shaft in the respective element bore in radial Direction are reciprocable and one each Cylinder space limit, via a suction valve with a Low pressure space is connected, solved by that exactly one suction valve is controlled so that it is in Dependence on the angle of rotation of the drive shaft opens and closes.
- a particular embodiment of the invention is characterized characterized in that the controlled suction valve a Valve body having, by a closing spring is applied, which is located on the associated piston supported.
- the closing spring presses depending on the Position of the associated piston and thus the Drive shaft against the valve body of the suction valve. If the piston is in its top dead center is the Distance between the piston and the valve body at smallest. Consequently, that of the closing spring on the Valve body applied force greatest.
- Another particular embodiment of the invention is characterized in that the controlled suction valve is e.g. via a magnet is so controllable that it is at the top Dead center of the associated piston opens and one certain rotation angle of the drive shaft later again closes. Due to the exact opening time of the Controlled suction valve is the equal promotion of Radial piston pump according to the invention improved.
- Another particular embodiment of the invention is characterized in that the remaining suction valves so are designed to be independent of the rotation angle of the Open drive shaft at different opening pressures.
- the remaining, uncontrolled suction valves open in Dependence on the prevailing pressure difference. Druch the different opening pressures ensures that Each suction valve opens at minimum delivery.
- all pump elements promote fuel.
- the opening times of each are Suction valves different. Thus, not everyone promotes Element the same amount of fuel. Nevertheless, in the Practice with the radial piston pump according to the invention good Results achieved.
- the radial piston pump according to the invention comprises three Pump elements offset by 120 ° from each other in one Radial plane are arranged to the axis of a drive shaft.
- the drive shaft is rotatable in a pump housing stored and with an eccentric shaft section fitted.
- the eccentric shaft section of the Drive shaft cooperates with three pistons, the radial to the drive shaft in a respective element bore are arranged.
- the pistons limit one each Cylinder space.
- Through a suction valve fuel enters the Cylinder space and is there by the piston with high pressure applied.
- the high pressure fuel passes through a pressure valve in one High-pressure fuel storage (Rail).
- the radial piston pump according to the invention thus comprises three Suction valves and three pressure valves.
- a first Embodiment of the invention will be two conventional, spring-loaded suction valves together with a used rotary angle controlled suction valve whose Closing spring is supported against the associated piston.
- rotationally controlled means that the Suction valve depending on the angle of rotation of the drive shaft is controlled.
- the control of the suction valve is done by the closing spring, which depends on the position of the associated piston a more or less large force exerts the suction valve.
- Such a suction valve is, for example. in the non-prepublished (DE 198 48 035) described.
- the piston strokes H of the three pump elements 1, 2 and 3 are plotted over time as a function of the position of the associated suction valves S 1 , S 2 and S 3 .
- the suction valve S 2 is rotational angle controlled.
- the suction valve S 2 opens.
- the closing spring which is supported on the piston is compressed, whereby the suction valve S 2 closes.
- the low-pressure chamber which is formed in conventional radial piston pumps by an annular channel, there is still inlet pressure. The inlet pressure ensures that the uncontrolled suction valve S 3 opens.
- the opening pressure at the suction valve S 3 may not be set higher than in the suction valve S 1 .
- the suction valve S 3 remains open until the pump element 3 is filled so far that the higher opening pressure of the suction valve S 1 is reached. Then the uncontrolled suction valve S 1 opens until the controlled suction valve S 2 is opened again.
- FIG. 2 shows an embodiment of the invention with two conventional suction valves S 1 , S 3 and a separately controlled suction valve S 2 is shown.
- the suction valve S 2 is controlled so that it opens at top dead center TDC of the pump element 2 and closes at a low flow rate 120 ° rotation angle of the drive shaft later again.
- By the adjacent inlet pressure then opens the suction valve S 1 , whose opening pressure is set lower than that of the suction valve S 3rd In the pump element 1 which thereby fills the piston pushes the fuel due to its stroke movement against the suction valve S 1 , which is thereby closed.
- the suction valve S 3 is then opened, and that until the piston in the pump element 1 has left the top dead center, whereby the suction valve S 1 opens again because of its lower opening pressure.
- the suction valve S 1 remains open until the controlled suction valve S 2 opens again.
- the inventive combination of the separately controlled suction valve S 2 with the uncontrolled suction valves S 1 and S 3 ensures that all three pump elements 1 to 3 are securely filled with fuel.
- the controlled opening duration of the suction valve S 2 of 120 ° rotation angle is to be expected with a better equal promotion than in the embodiment shown in Figure 1.
- the control for the separate suction valve S 2 is integrated into the radial piston pump.
- the invention generally provides the advantage that the Opening pressure of the uncontrolled suction valves are lowered can. As a result, the starting conditions for the prefeed pump in a common rail injection system defused. In addition, the efficiency compared to a Radial piston pump with three controlled suction valves increased become.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Description
Die Erfindung betrifft eine Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung in Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere in einem Common-Rail Einspritzsystem, mit einer in einem Pumpengehäuse drehbar gelagerten Antriebswelle, die exzentrisch ausgebildet ist und mit mehreren, insbesondere drei, bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten Kolben zusammenwirkt, die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind und jeweils einen Zylinderraum begrenzen, der über ein Saugventil mit einem Niederdruckraum in Verbindung steht.The invention relates to a radial piston pump for High-pressure fuel production in fuel injection systems of internal combustion engines, in particular in a common rail Injection system, with one rotatable in a pump housing mounted drive shaft which is eccentric and with several, in particular three, with respect to Drive shaft radially in a respective element bore arranged piston cooperates by turning the Drive shaft in the respective element bore in radial Direction are reciprocable and one each Cylinder space limit, via a suction valve with a Low pressure space communicates.
In Common-Rail-Einspritzsystemen fördert eine Hochdruckpumpe unter Zuhilfenahme einer Vorförderpumpe den einzuspritzenden Kraftstoff aus einem Kraftstofftank in einen zentralen Kraftstoffhochdruckspeicher, der als Common-Rail bezeichnet wird. Von dem Rail führen Kraftstoffleitungen zu den einzelnen Injektoren, die den Zylindern der Brennkraftmaschine zugeordnet sind. Die Injektoren werden in Abhängigkeit von den Betriebsparametern der Brennkraftmaschine einzeln von der Motorelektronik angesteuert, um Kraftstoff in den Brennraum der Brennkraftmaschine einzuspritzen. In common-rail injection systems promotes a High pressure pump with the aid of a feed pump the Fuel to be injected from a fuel tank in a central high-pressure fuel storage, as Common rail is called. Lead by the rail Fuel lines to the individual injectors, the Cylinders of the internal combustion engine are assigned. The Injectors are dependent on the Operating parameters of the internal combustion engine individually from the Engine electronics driven to fuel in the combustion chamber to inject the internal combustion engine.
Als Hochdruckpumpe kann eine Radialkolbenpumpe verwendet werden, wie sie bspw. in der nicht vorveröffentlichten DE 198 48 035 beschrieben ist. Bei einer solchen Radialkolbenpumpe bildet ein Kolben mit dem zugehörigen Zylinderraum jeweils ein Pumpenelement, durch das der geförderte Kraftstoff mit Hochdruck beaufschlagt wird. Die Fördermenge der Radialkolbenpumpe kann mit Hilfe einer Zumesseinheit an den jeweiligen Bedarf der Brennkraftmaschine angepasst werden. Dann wird in der Radialkolbenpumpe nur soviel Kraftstoff verdichtet, wie tatsächlich gebraucht wird. Als Zumesseinheit kann eine auf der Saugseite der Radialkolbenpumpe vorgesehene verstellbare Drossel eingesetzt werden. Das hat zur Folge, dass die einzelnen Zylinderräume im Betrieb bei einer geringen Fördermenge nicht vollständig gefüllt werden.As a high-pressure pump, a radial piston pump can be used as they are, for example, in the unpublished DE 198 48 035 is described. In such a Radial piston pump forms a piston with the associated Cylinder space each have a pump element through which the pumped fuel is subjected to high pressure. The Flow rate of the radial piston pump can with the help of a Metering unit to the respective needs of Internal combustion engine to be adjusted. Then in the Radial piston pump only as much fuel compressed as actually needed. As a metering unit, an on the suction side of the radial piston pump provided adjustable throttle can be used. As a result, that the individual cylinder chambers in operation at a low flow rate can not be completely filled.
Zur Abdichtung der einzelnen Zylinderräume gegenüber dem Niederdruckraum können durch eine Schließfeder vorgespannte Saugventile verwendet werden. In der Praxis weisen verschiedene Saugventile gleicher Bauart herstellungsbedingt unterschiedliche Vorspannungen auf. Demzufolge sind die Öffnungsdrücke der verschiedenen Saugventile auch unterschiedlich. Das hat zur Folge, dass verschiedene baugleiche Saugventile einer Radialkolbenpumpe, insbesondere bei Minimalförderung, in Abhängigkeit von der Vorspannung der jeweiligen Schließfeder unterschiedlich lange geöffnet sind. Im Extremfall kann es passieren, dass ein Saugventil überhaupt nicht öffnet. Somit wird der entsprechende Zylinderraum im Saughub nur unzureichend oder gar nicht gefüllt. Dadurch wird eine ungleichmäßige Förderung der einzelnen Pumpenelemente bewirkt. Das wiederum kann zu einem unrunden Lauf der Brennkraftmaschine führen, was besonders im PKW-Bereich unerwünscht ist.To seal the individual cylinder chambers from the Low pressure space can be preloaded by a closing spring Suction valves are used. In practice various suction valves of the same design Due to manufacturing different bias voltages on. As a result, the opening pressures of the various Suction valves also different. This has the consequence that various identical suction valves one Radial piston pump, in particular at minimum delivery, in Dependence on the bias of each Closing spring are open for different lengths. in the Extreme case, it can happen that a suction valve at all not open. Thus, the corresponding cylinder space in Suction stroke insufficient or not filled. Thereby will be an uneven promotion of each Pump elements causes. That, in turn, can turn into a non-round Run the internal combustion engine lead, which is especially in the car area is undesirable.
In der nichtvorveröffentlichten DE 198 48 035 wird vorgeschlagen, die Gleichförderung der einzelnen Pumpenelemente dadurch zu verbessern, dass die Schließfedern sämtlicher Saugventile an den zugehörigen Kolben abgestützt sind. Dadurch wird das Öffnen der Saugventile in Abhängigkeit von der Kolbenstellung gesteuert. Wenn sich ein Kolben auf das zugehörige Saugventil zubewegt, wird von der Schließfeder eine zunehmende Kraft auf den Ventilkörper des Saugventils ausgeübt. Dadurch wird sichergestellt, dass das Saugventil geschlossen ist, wenn sich der zugehörige Kolben in seinem oberen Totpunkt befindet. Wenn sich der Kolben von dem Saugventil wegbewegt, nimmt die von der Schließfeder auf den Ventilkörper des Saugventils ausgeübte Kraft ab. Dadurch wird sichergestellt, dass das Saugventil geöffnet ist, wenn sich der zugehörige Kolben im unteren Totpunkt befindet. Die in der DE 198 48 035 beschriebene Lösung hat jedoch den Nachteil, dass sie relativ aufwendig und teuer zu realisieren ist.In the non-prepublished DE 198 48 035 is proposed the equal promotion of each Improve pump elements by the Closing springs of all suction valves to the associated Pistons are supported. This will open the Suction valves depending on the piston position controlled. When a piston on the associated Suction valve is moved by the closing spring a increasing force on the valve body of the suction valve exercised. This will ensure that the suction valve is closed when the associated piston in his is located at top dead center. When the piston of the Suction valve moves away, picks up on the closing spring The force exerted by the valve body of the suction valve. This will ensure that the suction valve is open is when the associated piston at bottom dead center located. The solution described in DE 198 48 035 has however, the disadvantage that they are relatively expensive and expensive to realize.
Eine Radialkolbenpumpe mit den Merkmalen des Oberbegriffs von Anspruch 1 ist aus
der WO 99/02857 bekannt.A radial piston pump with the features of the preamble of
Aufgabe der Erfindung ist es, eine Radialkolbenpumpe bereitzustellen, die eine Gleichförderung der einzelnen Pumpenelemente gewährleistet und kostengünstig herstellbar ist.The object of the invention is a radial piston pump to provide an equal promotion of each Guaranteed pump elements and inexpensive to produce is.
Die Aufgabe ist bei einer Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung in Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere in einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse drehbar gelagerten Antriebswelle, die exzentrisch ausgebildet ist und mit mehreren, insbesondere drei, bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten Kolben zusammenwirkt, die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind und jeweils einen Zylinderraum begrenzen, der über ein Saugventil mit einem Niederdruckraum in Verbindung steht, dadurch gelöst, dass genau ein Saugventil so gesteuert ist, dass es in Abhängigkeit vom Drehwinkel der Antriebswelle öffnet und schließt.The task is with a radial piston pump for High-pressure fuel production in fuel injection systems of internal combustion engines, in particular in a common rail injection system, rotatable with one in a pump housing mounted drive shaft which is eccentric and with several, in particular three, with respect to Drive shaft radially in a respective element bore arranged piston cooperates by turning the Drive shaft in the respective element bore in radial Direction are reciprocable and one each Cylinder space limit, via a suction valve with a Low pressure space is connected, solved by that exactly one suction valve is controlled so that it is in Dependence on the angle of rotation of the drive shaft opens and closes.
Die Verwendung von nur einem gesteuerten Saugventil hat den Vorteil, dass nicht für jedes Pumpenelement ein gesteuertes Saugventil verwendet werden muss. Dadurch können die Herstellkosten der Radialkolbenpumpe und der Einstellaufwand der Saugventile deutlich reduziert werden.The use of only one controlled suction valve has the Advantage that not a controlled for each pump element Suction valve must be used. This allows the Production costs of the radial piston pump and the Adjustment of the suction valves can be significantly reduced.
Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet dass das gesteuerte Saugventil einen Ventilkörper aufweist, der durch eine Schließfeder beaufschlagt ist, die sich an dem zugehörigen Kolben abstützt. Die Schließfeder drückt in Abhängigkeit von der Stellung des zugehörigen Kolbens und somit der Antriebswelle gegen den Ventilkörper des Saugventils. Wenn sich der Kolben in seinem oberen Totpunkt befindet, ist der Abstand zwischen dem Kolben und dem Ventilkörper am kleinsten. Demzufolge ist die von der Schließfeder auf den Ventilkörper aufgebrachte Kraft am größten.A particular embodiment of the invention is characterized characterized in that the controlled suction valve a Valve body having, by a closing spring is applied, which is located on the associated piston supported. The closing spring presses depending on the Position of the associated piston and thus the Drive shaft against the valve body of the suction valve. If the piston is in its top dead center is the Distance between the piston and the valve body at smallest. Consequently, that of the closing spring on the Valve body applied force greatest.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass das gesteuerte Saugventil z.B. über einen Magneten so steuerbar ist, dass es am oberen Totpunkt des zugehörigen Kolbens öffnet und einen bestimmten Drehwinkel der Antriebswelle später wieder schließt. Durch die genau festgelegte Öffnungsdauer des gesteuerten Saugventils wird die Gleichförderung der erfindungsgemäßen Radialkolbenpumpe verbessert.Another particular embodiment of the invention is characterized in that the controlled suction valve is e.g. via a magnet is so controllable that it is at the top Dead center of the associated piston opens and one certain rotation angle of the drive shaft later again closes. Due to the exact opening time of the Controlled suction valve is the equal promotion of Radial piston pump according to the invention improved.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass die übrigen Saugventile so ausgelegt sind, dass sie unabhängig vom Drehwinkel der Antriebswelle bei unterschiedlichen Öffnungsdrücken öffnen. Die übrigen, ungesteuerten Saugventile öffnen in Abhängigkeit von der herrschenden Druckdifferenz. Druch die unterschiedlichen Öffnungsdrücke ist gewährleistet, dass jedes Saugventil auch bei Minimalförderung öffnet. Demzufolge fördern alle Pumpenelemente Kraftstoff. Allerdings sind die Öffnungszeiten der einzelnen Saugventile unterschiedlich. Somit fördert nicht jedes Element die gleiche Kraftstoffmenge. Dennoch wurden in der Praxis mit der erfindungsgemäßen Radialkolbenpumpe gute Ergebnisse erzielt.Another particular embodiment of the invention is characterized in that the remaining suction valves so are designed to be independent of the rotation angle of the Open drive shaft at different opening pressures. The remaining, uncontrolled suction valves open in Dependence on the prevailing pressure difference. Druch the different opening pressures ensures that Each suction valve opens at minimum delivery. As a result, all pump elements promote fuel. However, the opening times of each are Suction valves different. Thus, not everyone promotes Element the same amount of fuel. Nevertheless, in the Practice with the radial piston pump according to the invention good Results achieved.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung zwei Ausführungsbeispiele der Erfindung im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Further advantages, features and details of the invention will be apparent from the following description in which with reference to the drawing two Embodiments of the invention described in detail are. It can in the claims and in the Description mentioned features each individually or be essential to the invention in any combination.
In der Zeichnung zeigen:
Figur 1- die Auftragung der Kolbenhübe über der Zeit in Abhängigkeit von der Stellung der Saugventile gemäß einer ersten Ausführungsform der Erfindung und
Figur 2- die Auftragung der Kolbenhübe über der Zeit in Abhängigkeit von der Stellung der Saugventile gemäß einer zweiten Ausführungsform der Erfindung.
- FIG. 1
- the plot of the piston strokes over time as a function of the position of the suction valves according to a first embodiment of the invention and
- FIG. 2
- the plot of the piston strokes over time as a function of the position of the suction valves according to a second embodiment of the invention.
Die erfindungsgemäße Radialkolbenpumpe umfasst drei Pumpenelemente, die um 120° gegeneinander versetzt in einer Radialebene zur Achse einer Antriebswelle angeordnet sind. Die Antriebswelle ist drehbar in einem Pumpengehäuse gelagert und mit einem exzentrischen Wellenabschnitt ausgestattet. Der exzentrische Wellenabschnitt der Antriebswelle wirkt mit drei Kolben zusammen, die Radial zu der Antriebswelle in einer jeweiligen Elementbohrung angeordnet sind. Die Kolben begrenzen jeweils einen Zylinderraum. Über ein Saugventil gelangt Kraftstoff in den Zylinderraum und wird dort durch den Kolben mit Hochdruck beaufschlagt. Der mit Hochdruck beaufschlagte Kraftstoff gelangt über ein Druckventil in einem Kraftstoffhochdruckspeicher (Rail).The radial piston pump according to the invention comprises three Pump elements offset by 120 ° from each other in one Radial plane are arranged to the axis of a drive shaft. The drive shaft is rotatable in a pump housing stored and with an eccentric shaft section fitted. The eccentric shaft section of the Drive shaft cooperates with three pistons, the radial to the drive shaft in a respective element bore are arranged. The pistons limit one each Cylinder space. Through a suction valve fuel enters the Cylinder space and is there by the piston with high pressure applied. The high pressure fuel passes through a pressure valve in one High-pressure fuel storage (Rail).
Die erfindungsgemäße Radialkolbenpumpe umfasst also drei Saugventile und drei Druckventile. Gemäß einer ersten Ausführungsform der Erfindung werden zwei herkömmliche, federvorgespannte Saugventile zusammen mit einem drehwinkelgesteuerten Saugventil verwendet, dessen Schließfeder gegen den zugehörigen Kolben abgestützt ist. Der Begriff drehwinkelgesteuert bedeutet, dass das Saugventil in Abhängigkeit vom Drehwinkel der Antriebswelle gesteuert ist. Die Steuerung des Saugventils erfolgt durch die Schließfeder, die in Abhängigkeit von der Stellung des zugehörigen Kolbens eine mehr oder weniger große Kraft auf das Saugventil ausübt. Ein derartiges Saugventil ist bspw. in der nicht vorveröffentlichten (DE 198 48 035) beschrieben.The radial piston pump according to the invention thus comprises three Suction valves and three pressure valves. According to a first Embodiment of the invention will be two conventional, spring-loaded suction valves together with a used rotary angle controlled suction valve whose Closing spring is supported against the associated piston. The term rotationally controlled means that the Suction valve depending on the angle of rotation of the drive shaft is controlled. The control of the suction valve is done by the closing spring, which depends on the position of the associated piston a more or less large force exerts the suction valve. Such a suction valve is, for example. in the non-prepublished (DE 198 48 035) described.
In Figur 1 sind die Kolbenhübe H der drei Pumpenelemente 1,
2 und 3 über der Zeit in Abhängigkeit von der Stellung der
zugehörigen Saugventile S1, S2 und S3 aufgetragen. Das
Saugventil S2 ist drehwinkelgesteuert. Wenn sich der zu dem
Pumpenelement 2 gehörige Kolben 2 in der Nähe des unteren
Totpunkts befindet, öffnet das Saugventil S2. Bei der
Bewegung des Kolbens 2 nach oben wird die sich an dem
Kolben abstützende Schließfeder zusammengedrückt, wodurch
das Saugventil S2 schließt. In dem (nicht dargestellten)
Niederdruckraum, der bei herkömmlichen Radialkolbenpumpen
von einem Ringkanal gebildet wird, herrscht weiterhin
Zulaufdruck. Der Zulaufdruck sorgt dafür, dass das
ungesteuerte Saugventil S3 öffnet. Dazu darf der
Öffnungdruck am Saugventil S3 nicht höher eingestellt sein
als bei dem Saugventil S1. Das Saugventil S3 bleibt solange
geöffnet, bis das Pumpenelement 3 so weit gefüllt ist, dass
der höhere Öffnungsdruck des Saugventils S1 erreicht ist.
Dann öffnet das ungesteuerte Saugventil S1 solange, bis das
gesteuerte Saugventil S2 wieder geöffnet wird.In FIG. 1, the piston strokes H of the three
Durch die erfindungsgemäße Kombination von einem gesteuerten und zwei ungesteuerten Saugventilen ist gewährleistet, dass in Betrieb der Radialkolbenpumpe auch bei Minimalförderung jedes Saugventil geöffnet wird und somit alle drei Pumpenelemente Kraftstoff fördern. Allerdings fördert bei dem erfindungsgemäßen Prinzip nicht jedes Pumpenelement die gleiche Kraftstoffmenge, da die Öffnungszeiten der Saugventile unterschiedlich lang sind, wie in Figur 1 zu sehen ist.By the inventive combination of a controlled and two uncontrolled suction valves ensures that in operation of the radial piston pump too At minimum delivery each suction valve is opened and Thus, all three pump elements promote fuel. However, does not promote in the inventive principle each pump element the same amount of fuel, since the Opening times of the suction valves are different lengths, as can be seen in FIG.
Eine noch bessere Gleichförderung kann mit einem gesondert,
z.B. magnetisch, gesteuerten Saugventil realisiert werden.
In Figur 2 ist eine Ausführungsform der Erfindung mit zwei
herkömmlichen Saugventilen S1, S3 sowie einem gesondert
gesteuerten Saugventil S2 dargestellt. Das Saugventil S2
ist so gesteuert, dass es am oberen Totpunkt OT des
Pumpenelements 2 öffnet und bei einer geringen Fördermenge
120° Drehwinkel der Antriebswelle später wieder schließt.
Durch den anliegenden Zulaufdruck öffnet anschließend das
Saugventil S1, dessen Öffnungsdruck geringer eingestellt
ist als der des Saugventils S3. In dem sich dadurch
füllenden Pumpenelement 1 drückt der Kolben den Kraftstoff
aufgrund seiner Hubbewegung gegen das Saugventil S1, das
dadurch geschlossen wird. Durch den in den Niederdruckraum
herrschenden Druck wird dann das Saugventil S3 geöffnet,
und zwar solange, bis der Kolben im Pumpenelement 1 den
oberen Totpunkt wieder verlassen hat, wodurch das
Saugventil S1 wegen seines geringeren Öffnungsdrucks wieder
öffnet. Das Saugventil S1 bleibt solange geöffnet, bis das
gesteuerte Saugventil S2 wieder öffnet.An even better equal promotion can be realized with a separate, eg magnetic, controlled suction valve. 2 shows an embodiment of the invention with two conventional suction valves S 1 , S 3 and a separately controlled suction valve S 2 is shown. The suction valve S 2 is controlled so that it opens at top dead center TDC of the
Durch die erfindungsgemäße Kombination des gesondert
gesteuerten Saugventils S2 mit den ungesteuerten
Saugventilen S1 und S3 ist sichergestellt, dass alle drei
Pumpenelemente 1 bis 3 sicher mit Kraftstoff gefüllt
werden. Durch die gesteuerte Öffnungsdauer des Saugventils
S2 von 120° Drehwinkel ist mit einer besseren
Gleichförderung als bei der in Figur 1 dargestellten
Ausführungsform zu rechnen. Die Steuerung für das
gesonderte Saugventil S2 ist in die Radialkolbenpumpe
integriert.The inventive combination of the separately controlled suction valve S 2 with the uncontrolled suction valves S 1 and S 3 ensures that all three
Die Erfindung liefert allgemein den Vorteil, dass der Öffnungsdruck der ungesteuerten Saugventile gesenkt werden kann. Dadurch werden zusätzlich die Startbedingungen für die Vorförderpumpe in einem Common-Rail-Einspritzsystem entschärft. Außerdem kann der Wirkungsgrad gegenüber einer Radialkolbenpumpe mit drei gesteuerten Saugventilen erhöht werden.The invention generally provides the advantage that the Opening pressure of the uncontrolled suction valves are lowered can. As a result, the starting conditions for the prefeed pump in a common rail injection system defused. In addition, the efficiency compared to a Radial piston pump with three controlled suction valves increased become.
Claims (4)
- Radial piston pump for the generation of high fuel pressure in fuel injection systems for internal combustion engines, in particular in a common-rail injection system, with a drive shaft which is mounted rotatably in a pump casing and which is designed eccentrically and interacts with a plurality of, in particular three, pistons which are arranged in a respective element bore radially with respect to the drive shaft and which are moveable to and fro in the radial direction in the respective element bore as a result of the rotation of the drive shaft and in each case delimit a cylinder space which is connected to a low-pressure space via a suction valve (S1, S2, S3), characterized in that exactly one suction valve (S2) is controlled in such a way that it opens and closes as a function of the angle of rotation of the drive shaft.
- Radial piston pump according to Claim 1, characterized in that the controlled suction valve (S2) has a valve body acted upon by a closing spring which is supported on the associated piston.
- Radial piston pump according to Claim 1, characterized in that the controlled suction valve (S2) can be controlled, for example via a magnet, in such a way that it opens at the top dead centre of the associated piston and closes again later at a defined angle of rotation of the drive shaft.
- Radial piston pump according to one of the preceding claims, characterized in that the remaining suction valves (S1, S3) are designed in such a way that they open, independently of the angle of rotation of the drive shaft, at different opening pressures.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19959006A DE19959006C1 (en) | 1999-12-08 | 1999-12-08 | Radial piston pump for common-rail fuel injection system for automobile engine has suction valve for one cylinder bore controlled in dependence on rotation angle of eccentric drive shaft |
| DE19959006 | 1999-12-08 | ||
| PCT/DE2000/003914 WO2001042651A1 (en) | 1999-12-08 | 2000-11-09 | Radial piston pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1269021A1 EP1269021A1 (en) | 2003-01-02 |
| EP1269021B1 true EP1269021B1 (en) | 2005-11-16 |
Family
ID=7931747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00987099A Expired - Lifetime EP1269021B1 (en) | 1999-12-08 | 2000-11-09 | Radial piston pump |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6843641B1 (en) |
| EP (1) | EP1269021B1 (en) |
| JP (1) | JP4787444B2 (en) |
| DE (2) | DE19959006C1 (en) |
| WO (1) | WO2001042651A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006017036A1 (en) * | 2006-04-11 | 2007-10-18 | Siemens Ag | Radial piston pump for fuel high pressure supply in an internal combustion engine |
| US7444989B2 (en) * | 2006-11-27 | 2008-11-04 | Caterpillar Inc. | Opposed pumping load high pressure common rail fuel pump |
| US7690353B2 (en) * | 2007-11-30 | 2010-04-06 | Caterpillar Inc. | Synchronizing common rail pumping events with engine operation |
| DE102008036416B4 (en) * | 2008-08-05 | 2013-12-05 | Continental Automotive Gmbh | Pump and method for conveying a fluid |
| DE102009057927B4 (en) * | 2009-12-11 | 2016-05-19 | Continental Automotive Gmbh | Pump and method for conveying a fluid |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2336526A (en) * | 1941-07-02 | 1943-12-14 | Nat Tube Co | Means for controlling the operation of pumps and the like |
| JPS506043B1 (en) * | 1969-05-19 | 1975-03-10 | ||
| DE3243348A1 (en) * | 1982-11-24 | 1984-05-24 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP |
| JPH07122422B2 (en) | 1986-05-02 | 1995-12-25 | 日本電装株式会社 | Fuel injector |
| WO1990002876A1 (en) * | 1988-09-15 | 1990-03-22 | Zahnradfabrik Friedrichshafen Ag | Radial piston pump |
| US5167493A (en) * | 1990-11-22 | 1992-12-01 | Nissan Motor Co., Ltd. | Positive-displacement type pump system |
| CN1082143C (en) * | 1993-11-08 | 2002-04-03 | Crt公共铁路技术公司 | Control device for a variable volume pump |
| JP3310871B2 (en) * | 1996-07-08 | 2002-08-05 | 三菱電機株式会社 | Fuel injection device |
| DE19709586A1 (en) * | 1997-03-08 | 1998-09-10 | Itt Mfg Enterprises Inc | Vehicle brake hydraulic pump |
| DE19814477C2 (en) * | 1997-07-11 | 2002-08-01 | Bosch Gmbh Robert | Radial piston pump for high-pressure fuel supply |
| JP2001506343A (en) | 1997-07-11 | 2001-05-15 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Radial piston pump for high pressure fuel supply |
| DE19848035A1 (en) * | 1998-10-17 | 2000-04-20 | Bosch Gmbh Robert | Radial piston pump for high fuel pressure in IC engines with common-rail injection system has suction valve closure spring supported on pump piston and contained in long piston bore |
-
1999
- 1999-12-08 DE DE19959006A patent/DE19959006C1/en not_active Expired - Fee Related
-
2000
- 2000-11-09 WO PCT/DE2000/003914 patent/WO2001042651A1/en active IP Right Grant
- 2000-11-09 US US10/148,964 patent/US6843641B1/en not_active Expired - Fee Related
- 2000-11-09 DE DE50011662T patent/DE50011662D1/en not_active Expired - Lifetime
- 2000-11-09 JP JP2001543910A patent/JP4787444B2/en not_active Expired - Fee Related
- 2000-11-09 EP EP00987099A patent/EP1269021B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE50011662D1 (en) | 2005-12-22 |
| EP1269021A1 (en) | 2003-01-02 |
| JP4787444B2 (en) | 2011-10-05 |
| JP2003516498A (en) | 2003-05-13 |
| DE19959006C1 (en) | 2000-12-21 |
| WO2001042651A1 (en) | 2001-06-14 |
| US6843641B1 (en) | 2005-01-18 |
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