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EP1047875A1 - Radial piston pump for high pressure fuel supply - Google Patents

Radial piston pump for high pressure fuel supply

Info

Publication number
EP1047875A1
EP1047875A1 EP98965060A EP98965060A EP1047875A1 EP 1047875 A1 EP1047875 A1 EP 1047875A1 EP 98965060 A EP98965060 A EP 98965060A EP 98965060 A EP98965060 A EP 98965060A EP 1047875 A1 EP1047875 A1 EP 1047875A1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
radial piston
piston pump
ring
recess
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Withdrawn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
EP98965060A
Other languages
German (de)
French (fr)
Inventor
Josef Güntert
Bernd Streicher
Kasim-Melih Hamutcu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1047875A1 publication Critical patent/EP1047875A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M59/10—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 the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M59/02—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
    • F02M59/08—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 two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam

Definitions

  • the invention relates to a radial piston pump for high-pressure fuel supply
  • Fuel injection systems of internal combustion engines in particular in the case of a common rail injection system, with one which is mounted eccentrically in a pump housing
  • Drive shaft on which a ring is slidably mounted which cooperates with preferably a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which pistons can be moved back and forth in the respective cylinder space by rotating the drive shaft.
  • the base of the piston has contact with the ring mounted on the drive shaft.
  • the pistons are successively reciprocated due to the eccentricity of the drive shaft.
  • the stroke of the pistons is constant and corresponds to twice the eccentricity of the drive shaft.
  • the invention is based on the problem of enabling partial filling of the cylinder spaces of the radial piston pump.
  • the aim is to minimize wear on the individual components and avoid damage during operation.
  • the radial piston pump according to the invention is intended to withstand a pump pressure of up to 2000 bar in the conveying direction.
  • Fuel injection systems of internal combustion engines in particular in the case of a common rail injection system, with one which is mounted eccentrically in a pump housing
  • Drive shaft on which a ring is slidably mounted which cooperates with preferably a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which can be moved back and forth in the respective cylinder space by rotating the drive shaft, in that a guide device prevents the ring from rotating about its own axis.
  • a guide device prevents the ring from rotating about its own axis.
  • a special embodiment of the invention is characterized in that the guide device comprises a projection which extends at least partially parallel to the axis of rotation of the drive shaft and projects into a recess whose dimensions are larger than that of the projection.
  • the projection can either on the ring or on the
  • Pump housing may be formed. In the first case it is associated recess in the pump housing and in the second case provided in the ring.
  • the projection can only move in the transverse direction as far as the dimensions of the recess allow. This advantageously ensures that the movements of the ring are restricted in the circumferential direction.
  • Another special embodiment of the invention is characterized in that the projection is formed on the ring and the recess in the pump housing.
  • the reverse case is also possible, as described above, but in this case the size of the recess is limited to the dimensions of the ring. In contrast, there is sufficient space in the pump housing for the recess.
  • the projection and the recess each have the shape of a cylinder, the longitudinal axis of which is parallel to the axis of the drive shaft.
  • the ideal trajectory of the ring is a circle. Accordingly, it is advantageous if both the depression and the projection are cylindrical. This reduces the movement of the ring in the circumferential direction to the minimum necessary due to the eccentricity of the drive shaft.
  • Another special embodiment of the invention is characterized in that the diameter of the recess is slightly greater than twice the sum of the eccentricity of the drive shaft and the radius of the projection. This ensures that the ring can move in its ideal path without the projection and the recess being in contact with one another. This has the advantage that wear due to friction is reduced. The projection only comes into contact with the depression when the ring no longer moves on its ideal path.
  • a further special embodiment of the invention is characterized in that the projection is a pin which is fastened in a bore in the pump housing and in that the depression is a bore.
  • Another special embodiment of the invention is characterized in that the recess is annular.
  • the projection protrudes into the annular depression and can therefore only move in the circumferential direction of the depression.
  • the ring can only perform such movements. In this way, a positive guidance of the ring along its ideal path of movement is advantageously ensured.
  • the recess is a bore in which a pin is attached.
  • the ring shape of the recess can be realized easily and inexpensively.
  • the diameter of the pin is slightly less than twice the difference between the eccentricity and the radius of the Lead.
  • a further special embodiment of the invention is characterized in that at least three pistons are arranged radially to the drive shaft, a plate being held at the end of each piston directed towards the drive shaft by a cage which is in contact with a flattened portion is formed on the ring.
  • the guide device according to the invention has a particularly advantageous effect. Experiments carried out with such a pump have found that the ring can tilt about its axis if the cylinder spaces are not completely filled. This tilting is attributed to the fact that one
  • Element part filling does not keep all plates firmly enough against the ring.
  • the tilting causes shock forces on the plate, which are transferred to the cage and the piston.
  • the resulting moments then lead to damage to the affected components.
  • the guide device according to the invention can consist of at least one guide piston which, in addition to the already existing pistons, is arranged radially to the drive shaft and bears against the ring.
  • Figure 1 shows a sectional view of a radial piston pump according to the invention, the section running along the line DE in Figure 2;
  • FIG. 2 shows a section along line B-C through the radial piston pump from FIG. 1.
  • Figure 3 shows a partial view of a section along the line A-A in Figure 2;
  • Figure 4 shows the ideal trajectory of a ring and a guide device according to the present invention.
  • Figures 1 and 2 show a radial piston pump
  • Radial piston pump is equipped with an integrated demand control.
  • the fuel supply and dimensioning takes place via a not shown
  • the radial piston pump according to the invention is used in particular in common rail injection systems for supplying fuel
  • Common rail means “common line” or “common rail”.
  • the radial piston pump shown in FIGS. 1 and 2 comprises a one mounted in a pump housing 2
  • a shaft 8 is provided on the eccentric shaft section 6, with respect to which the shaft section 6 can be rotated.
  • the ring 8 comprises three flats 10, each offset by 120 ° to each other, against which a piston 12 is supported.
  • the pistons 12 are each received in a cylinder space 18 so that they can move back and forth in the radial direction relative to the drive shaft 4.
  • the foot of each piston 12 is designed as a plate 14, which lies against the flat 10 of the ring 8.
  • the plate 14 is fastened to the piston 12 by a cage 16 and is pressed against the ring 8 by a spring 20.
  • a twisting of the ring is reduced to a minimum by a guide device 24.
  • the guide device 24 shown by way of example in FIGS. 1 and 2 comprises, as can be seen most clearly in the partial view of FIG. 3, a bore 25 provided in the ring, in which a pin 26 is fastened.
  • the pin 26 protrudes into a further bore 28 which is provided in the housing 2 and whose diameter is larger than that of the pin 26.
  • Another pin 30 is fastened centrally in the bore 28 in the housing 2.
  • the .Dimensions of the holes and the pins are chosen so that the difference between the diameter of the bore 28 in the housing 2 and the diameter of the pin 30 in the housing 2 is slightly larger than the diameter of the pin 26 in the ring 8. Therefore the pin 26 can move in the annular space around the pin 30 in the bore 28 in the housing 2 on a circular path.
  • FIG. 4 shows the ideal movement path 46 of a polygonal ring 48.
  • the polygonal ring 48 is, as previously described, on an eccentrically designed drive shaft, not shown in FIG slidably mounted.
  • the eccentricity is designated E in FIG. 4.
  • a pin 44 with a diameter 45 is fastened in the ring 48.
  • the pin 44 projects with its free end into a bore 50 which is provided in a housing (not shown) and has a diameter 51.
  • a pin 47 is arranged, which is fixed in the housing and the diameter of which is designated 55.
  • the circle 46 has a diameter which corresponds to twice the eccentricity E, that is to say the piston stroke.
  • the diameter 51 of the bore 50 ideally corresponds to the sum of the piston stroke and the diameter of the pin 44 in the ring 48. In practice, the ideal dimensions are still the usual ones
  • the invention now has not only the advantage that the torque of the ring 8 is absorbed by the pin 26, but also the advantage that the center offset M can be eliminated. This has the consequence that the same thing for left and right-hand rotation of the radial piston pump according to the invention
  • the present invention also provides the advantage that the spring 20, which presses the plate 14 against the ring 8, is relieved. This increases the durability of the spring 20. In addition, breaks in the cage 16, which holds the plate 14 on the piston 12, are prevented. This simplifies quality assurance with regard to zero errors. Finally, it is pointed out that no one else for partial filling Center offset M of the piston 12 is necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a radial piston pump for high pressure fuel supply in fuel injection systems in internal combustion engines, especially in a common rail injection system, comprising a drive shaft eccentrically mounted in the pump housing, (2) on which a ring is slidingly arranged that interacts with preferably several pistons (12) arranged radially in relation to the drive shaft (4) in a corresponding cylinder chamber (18). Said pistons can be moved back and forth in radial direction by rotating the drive shaft (4) in the corresponding cylinder chamber (18). In order to enhance the efficiency of the internal combustion engine, the cylinder chambers are filled with less fuel as the demand decreases. In a so-called elementary part filling, increased wear and damages occur especially in the above-mentioned radial piston pump with three pistons on which a plate in mounted on a polygonal ring. This problem is solved by a guiding device (24) preventing the ring (18, 48) from rotating around its own axis.

Description

Radialkolbenpumpe zur KraftstoffhochdruckversorgungRadial piston pump for high-pressure fuel supply
Stand der TechnikState of the art
Die Erfindung betrifft eine Radialkolbenpumpe zur Kraftstoffhochdruckversorgung beiThe invention relates to a radial piston pump for high-pressure fuel supply
Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse exzentrisch gelagertenFuel injection systems of internal combustion engines, in particular in the case of a common rail injection system, with one which is mounted eccentrically in a pump housing
Antriebswelle, auf der ein Ring gleitend gelagert ist, der mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einem jeweiligen Zylinderraum angeordneten Kolben zusammenwirkt, die durch Drehen der .Antriebswelle in dem jeweiligen Zylinderraum in radialer Richtung hin und her bewegbar sind.Drive shaft on which a ring is slidably mounted, which cooperates with preferably a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which pistons can be moved back and forth in the respective cylinder space by rotating the drive shaft.
Bei einer derartigen innen abgestützten Radialkolbenpumpe hat jeweils der Fuß der Kolben Kontakt mit dem auf der Antriebswelle gelagerten Ring. Die Kolben werden infolge der Exzentrizität der Antriebswelle nacheinander in eine Hin- und Herbewegung versetzt. Der Hub der Kolben ist dabei konstant und entspricht dem zweifachen Betrag der Exzentrizität der Antriebswelle.In such an internally supported radial piston pump, the base of the piston has contact with the ring mounted on the drive shaft. The pistons are successively reciprocated due to the eccentricity of the drive shaft. The stroke of the pistons is constant and corresponds to twice the eccentricity of the drive shaft.
Um den Wirkungsgrad der Brennkraftmaschine zu erhöhen, ist vorgeschlagen worden, die Zylinderräume bei sinkendem Bedarf mit weniger Kraftstoff zu befullen.In order to increase the efficiency of the internal combustion engine, it has been proposed that the cylinder spaces decrease Need to fill with less fuel.
Der Erfindung liegt das Problem zugrunde, eine Teilbefüllung der Zylinderräume der Radialkolbenpumpe zu ermöglichen. Dabei soll der Verschleiß der einzelnen Bauteile minimiert und Beschädigungen im Betrieb vermieden werden. Insbesondere soll die erfindungsgemäße Radialkolbenpumpe einen Pumpendruck von bis zu 2000 bar in Förderrichtung aushalten.The invention is based on the problem of enabling partial filling of the cylinder spaces of the radial piston pump. The aim is to minimize wear on the individual components and avoid damage during operation. In particular, the radial piston pump according to the invention is intended to withstand a pump pressure of up to 2000 bar in the conveying direction.
Das Problem ist bei einer Radialkolbenpumpe zur Kraftstoffhochdruckversorgung beiThe problem is with a radial piston pump for high-pressure fuel supply
Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse exzentrisch gelagertenFuel injection systems of internal combustion engines, in particular in the case of a common rail injection system, with one which is mounted eccentrically in a pump housing
Antriebswelle, auf der ein Ring gleitend gelagert ist, der mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einem jeweiligen Zylinderraum angeordneten Kolben zusammenwirkt, die durch Drehen der Antriebswelle in dem jeweiligen Zylinderraum in radialer Richtung hin und her bewegbar sind, dadurch gelöst, daß eine Führungseinrichtung ein Verdrehen des Rings um seine eigene Achse verhindert. Im Rahmen der vorliegenden Erfindung hat sich herausgestellt, daß der erhöhte Verschleiß und die Beschädigungen bei herkömmlichen Radialkolbenpumpen auf ein Verdrehen des Rings um seine eigene Achse zurückzuführen sind. Durch die Führungseinrichtung wird dieses Verdrehen verhindert .Drive shaft on which a ring is slidably mounted, which cooperates with preferably a plurality of pistons arranged radially with respect to the drive shaft in a respective cylinder space, which can be moved back and forth in the respective cylinder space by rotating the drive shaft, in that a guide device prevents the ring from rotating about its own axis. In the context of the present invention, it has been found that the increased wear and damage in conventional radial piston pumps can be attributed to the ring rotating about its own axis. This twisting is prevented by the guide device.
Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß die Führungseinrichtung einen Vorsprung umfaßt, der sich zumindest teilweise parallel zur Drehachse der Antriebswelle erstreckt und in eine Vertiefung ragt, deren Abmessungen größer als die des Vorsprungs sind. Dabei kann der Vorsprung entweder an dem Ring oder an demA special embodiment of the invention is characterized in that the guide device comprises a projection which extends at least partially parallel to the axis of rotation of the drive shaft and projects into a recess whose dimensions are larger than that of the projection. The projection can either on the ring or on the
Pumpengehäuse ausgebildet sein. Im ersten Fall ist die zugehörige Vertiefung in dem Pumpengehäuse und im zweiten Fall im Ring vorgesehen. Der Vorsprung kann sich in Querrichtung nur soweit bewegen, wie es die .Abmessungen der Vertiefung zulassen. Dadurch ist vorteilhaft gewährleistet, daß die Bewegungen des Rings in Umfangsrichtung eingeschränkt werden.Pump housing may be formed. In the first case it is associated recess in the pump housing and in the second case provided in the ring. The projection can only move in the transverse direction as far as the dimensions of the recess allow. This advantageously ensures that the movements of the ring are restricted in the circumferential direction.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Vorsprung an dem Ring und die Vertiefung in dem Pumpengehäuse ausgebildet ist. Der umgekehrte Fall ist, wie vorab geschildert, auch möglich, allerdings ist in diesem Fall die Größe der Vertiefung auf die Abmessungen des Rings beschränkt. Im Pumpengehäuse ist dagegen ausreichend Platz für die Vertiefung vorhanden.Another special embodiment of the invention is characterized in that the projection is formed on the ring and the recess in the pump housing. The reverse case is also possible, as described above, but in this case the size of the recess is limited to the dimensions of the ring. In contrast, there is sufficient space in the pump housing for the recess.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Vorsprung und die Vertiefung jeweils die Form eines Zylinders haben, dessen Längsachse parallel zur Achse der Antriebswelle ist. Im Rahmen der vorliegenden Erfindung wurde festgestellt, daß die ideale Bewegungsbahn des Ringes ein Kreis ist. Demzufolge ist es vorteilhaft, wenn sowohl die Vertiefung als auch der Vorsprung zylinderförmig ausgebildet sind. Dadurch wird die Bewegung des Rings in Umfangsrichtung auf das wegen der Exzentrizität der Antriebswelle notwendige Minimum reduziert.Another special embodiment of the invention is characterized in that the projection and the recess each have the shape of a cylinder, the longitudinal axis of which is parallel to the axis of the drive shaft. In the context of the present invention it was found that the ideal trajectory of the ring is a circle. Accordingly, it is advantageous if both the depression and the projection are cylindrical. This reduces the movement of the ring in the circumferential direction to the minimum necessary due to the eccentricity of the drive shaft.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Durchmesser der Vertiefung dem Zweifachen der Summe aus der Exzentrizität derAnother special embodiment of the invention is characterized in that the diameter of the recess is twice the sum of the eccentricity of the
.Antriebswelle und dem Radius des Vorsprungs entspricht. Ein Kreis mit diesem Durchmesser entspricht der idealen Führungsbahn des Rings ..Drive shaft and the radius of the projection corresponds. A circle with this diameter corresponds to the ideal guideway of the ring.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Durchmesser der Vertiefung etwas größer als das Zweifache der Summe aus der Exzentrizität der Antriebswelle und dem Radius des Vorsprungs ist. Dadurch wird sichergestellt, daß sich der Ring auf seiner idealen Bahn bewegen kann, ohne daß der Vorsprung und die Vertiefung Kontakt miteinander haben. Das hat den Vorteil, daß die Abnutzung durch Reibung verringert wird. Der Vorsprung kommt erst dann in Kontakt mit der Vertiefung, wenn der Ring sich nicht mehr auf seiner idealen Bahn bewegt.Another special embodiment of the invention is characterized in that the diameter of the recess is slightly greater than twice the sum of the eccentricity of the drive shaft and the radius of the projection. This ensures that the ring can move in its ideal path without the projection and the recess being in contact with one another. This has the advantage that wear due to friction is reduced. The projection only comes into contact with the depression when the ring no longer moves on its ideal path.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß der Vorsprung ein Stift ist, der in einer Bohrung in dem Pumpengehäuse befestigt ist, und dadurch, daß die Vertiefung eine Bohrung ist. Dies ist eine von vielen Varianten zur Gestaltung des Vorsprungs und der Vertiefung. Diese Variante hat den Vorteil, daß sie einfach und kostengünstig hergestellt werden kann. Zudem ermöglicht sie die Anwendung der vorliegenden Erfindung auf bekannte Radialkolbenpumpen.A further special embodiment of the invention is characterized in that the projection is a pin which is fastened in a bore in the pump housing and in that the depression is a bore. This is one of many variants for the design of the projection and the recess. This variant has the advantage that it can be manufactured easily and inexpensively. It also enables the application of the present invention to known radial piston pumps.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß die Vertiefung ringförmig ausgebildet ist. Der Vorsprung ragt in die ringförmige Vertiefung und kann sich somit nur in Umfangsrichtung der Vertiefung bewegen. Folglich kann auch der Ring nur solche Bewegungen ausführen. Auf diese Weise ist vorteilhaft eine Zwangsführung des Rings entlang seiner idealen Bewegungsbahn sichergestellt.Another special embodiment of the invention is characterized in that the recess is annular. The projection protrudes into the annular depression and can therefore only move in the circumferential direction of the depression. As a result, the ring can only perform such movements. In this way, a positive guidance of the ring along its ideal path of movement is advantageously ensured.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß die Vertiefung eine Bohrung ist, in der ein Stift befestigt ist. Auf diese Art und Weise kann die Ringform der Vertiefung einfach und kostengünstig realisiert werden. Vorzugsweise ist der Durchmesser des Stifts etwas kleiner als das Zweifache der Differenz aus der Exzentrizität und dem Radius des Vorsprungs .Another special embodiment of the invention is characterized in that the recess is a bore in which a pin is attached. In this way, the ring shape of the recess can be realized easily and inexpensively. Preferably, the diameter of the pin is slightly less than twice the difference between the eccentricity and the radius of the Lead.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, daß radial zu der Antriebswelle mindestens drei Kolben angeordnet sind, wobei an dem zu der Antriebswelle gerichteten Ende eines jeden Kolbens durch einen Käfig eine Platte gehalten ist, die sich in Kontakt mit einer Abflachung befindet, die an dem Ring ausgebildet ist. Bei einer Radialkolbenpumpe mit einem polygonförmigen Ring wirkt sich die erfindungsgemäße Führungseinrichtung besonders vorteilhaft aus. Bei Versuchen, die mit einer solchen Pumpe durchgeführt worden sind, ist herausgefunden worden, daß der Ring, wenn die Zylinderräume nicht vollständig gefüllt sind, um seine Achse kippen kann. Dieses Kippen wird darauf zurückgeführt, daß bei einerA further special embodiment of the invention is characterized in that at least three pistons are arranged radially to the drive shaft, a plate being held at the end of each piston directed towards the drive shaft by a cage which is in contact with a flattened portion is formed on the ring. In the case of a radial piston pump with a polygonal ring, the guide device according to the invention has a particularly advantageous effect. Experiments carried out with such a pump have found that the ring can tilt about its axis if the cylinder spaces are not completely filled. This tilting is attributed to the fact that one
Elementteilbefüllung nicht alle Platten dauernd fest genug an dem Ring anliegen. Das Kippen verursacht Stoßkräfte auf die Platte, die auf den Käfig und den Kolben übertragen werden. Die daraus resultierenden Momente führen dann zu Beschädigungen an den betroffenen Bauteilen.Element part filling does not keep all plates firmly enough against the ring. The tilting causes shock forces on the plate, which are transferred to the cage and the piston. The resulting moments then lead to damage to the affected components.
Die erfindungsgemäße Führungseinrichtung kann im einfachsten Fall aus mindestens einem Führungskolben bestehen, der zusätzlich zu den schon vorhandenen Kolben radial zu der Antriebswelle angeordnet ist und an dem Ring anliegt .In the simplest case, the guide device according to the invention can consist of at least one guide piston which, in addition to the already existing pistons, is arranged radially to the drive shaft and bears against the ring.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel im Einzelnen beschrieben ist. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. Figur 1 zeigt eine Schnittdarstellung einer erfindungsgemäßen Radialkolbenpumpe, wobei der Schnitt entlang der Linie D-E in Figur 2 verläuft ;Further advantages, features and details of the invention emerge from the subclaims and the following description, in which an exemplary embodiment is described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. Figure 1 shows a sectional view of a radial piston pump according to the invention, the section running along the line DE in Figure 2;
Figur 2 zeigt einen Schnitt entlang der Linie B-C durch die Radialkolbenpumpe aus Figur 1 •FIG. 2 shows a section along line B-C through the radial piston pump from FIG. 1.
Figur 3 zeigt eine Teilansicht eines Schnitts entlang der Linie A-A in Figur 2 ;Figure 3 shows a partial view of a section along the line A-A in Figure 2;
Figur 4 zeigt die ideale Bewegungsbahn eines Rings sowie eine Führungseinrichtung gemäß der vorliegenden Erfindung.Figure 4 shows the ideal trajectory of a ring and a guide device according to the present invention.
Die Figuren 1 und 2 zeigen eine Radialkolbenpumpe zurFigures 1 and 2 show a radial piston pump
Kraftstoffhochdruckversorgung beiHigh pressure fuel supply at
Kraftstoffeinspritzsystemen von Brennkraftmaschinen. DieFuel injection systems for internal combustion engines. The
Radialkolbenpumpe ist mit einer integrierten Bedarfsmengenregelung ausgestattet. Die Kraftstoffzufuhr und Dimensionierung erfolgt über eine nicht dargestellteRadial piston pump is equipped with an integrated demand control. The fuel supply and dimensioning takes place via a not shown
Zumesseinheit .Metering unit.
Die erfindungsgemäße Radialkolbenpumpe wird insbesondere in Common-Rail-Einspritzsystemen zur KraftstoffVersorgung vonThe radial piston pump according to the invention is used in particular in common rail injection systems for supplying fuel
Dieselmotoren eingesetzt. Dabei bedeutet "common rail" soviel wie "gemeinsame Leitung" oder "gemeinsame Schiene" .Diesel engines used. "Common rail" means "common line" or "common rail".
Im Gegensatz zu herkömmlichen Hochdruckeinspritzsystemen, in denen der Kraftstoff über getrennte Leitungen zu den einzelnen Brennräumen gefördert wird, werden dieIn contrast to conventional high-pressure injection systems, in which the fuel is delivered to the individual combustion chambers via separate lines, the
Einspritzdüsen in Common-Rail-Einspritzsystemen aus einer gemeinsamen Leitung gespeist.Injectors in common rail injection systems fed from a common line.
Die in den Figuren 1 und 2 gezeigte Radialkolbenpumpe umfaßt eine in einem Pumpengehäuse 2 gelagerteThe radial piston pump shown in FIGS. 1 and 2 comprises a one mounted in a pump housing 2
Antriebswelle 4 mit einem exzentrisch ausgebildeten Wellenabschnitt 6. Auf dem exzentrischen Wellenabschnitt 6 ist ein Ring 8 vorgesehen, gegenüber dem der Wellenabschnitt 6 drehbar ist. Der Ring 8 umfaßt drei jeweils um 120° zueinander versetzte Abflachungen 10 gegen die sich jeweils ein Kolben 12 abstützt. Die Kolben 12 sind jeweils in einem Zylinderraum 18 zur Antriebswelle 4 in radialer Richtung hin- und herbewegbar aufgenommen. Der Fuß eines jeden Kolbens 12 ist als Platte 14 ausgebildet, die jeweils an der Abflachung 10 des Rings 8 anliegt. Die Platte 14 ist jeweils durch einen Käfig 16 an dem Kolben 12 befestigt und wird durch eine Feder 20 gegen den Ring 8 gedrückt .Drive shaft 4 with an eccentrically designed A shaft 8 is provided on the eccentric shaft section 6, with respect to which the shaft section 6 can be rotated. The ring 8 comprises three flats 10, each offset by 120 ° to each other, against which a piston 12 is supported. The pistons 12 are each received in a cylinder space 18 so that they can move back and forth in the radial direction relative to the drive shaft 4. The foot of each piston 12 is designed as a plate 14, which lies against the flat 10 of the ring 8. The plate 14 is fastened to the piston 12 by a cage 16 and is pressed against the ring 8 by a spring 20.
Durch eine Führungseinrichtung 24 wird ein Verdrehen des Rings auf ein Minimum reduziert. Die in den Figuren 1 und 2 beispielhaft dargestellte Führungseinrichtung 24 umfaßt, wie am deutlichsten in der Teilansicht der Figur 3 zu sehen ist, eine in dem Ring vorgesehene Bohrung 25, in der ein Stift 26 befestigt ist.A twisting of the ring is reduced to a minimum by a guide device 24. The guide device 24 shown by way of example in FIGS. 1 and 2 comprises, as can be seen most clearly in the partial view of FIG. 3, a bore 25 provided in the ring, in which a pin 26 is fastened.
Der Stift 26 ragt in eine weitere Bohrung 28, die in dem Gehäuse 2 vorgesehen ist, und deren Durchmesser größer als der des Stiftes 26 ist. In der Bohrung 28 im Gehäuse 2 ist ein weiterer Stift 30 mittig befestigt. Die .Abmessungen der Bohrungen und der Stifte sind so gewählt, daß die Differenz zwischen dem Durchmesser der Bohrung 28 in dem Gehäuse 2 und dem Durchmesser des Stifts 30 in dem Gehäuse 2 etwas größer ist als der Durchmesser des Stifts 26 in dem Ring 8. Deshalb kann sich der Stift 26 in dem Ringraum um den Stift 30 in der Bohrung 28 in dem Gehäuse 2 auf einer Kreisbahn bewegen .The pin 26 protrudes into a further bore 28 which is provided in the housing 2 and whose diameter is larger than that of the pin 26. Another pin 30 is fastened centrally in the bore 28 in the housing 2. The .Dimensions of the holes and the pins are chosen so that the difference between the diameter of the bore 28 in the housing 2 and the diameter of the pin 30 in the housing 2 is slightly larger than the diameter of the pin 26 in the ring 8. Therefore the pin 26 can move in the annular space around the pin 30 in the bore 28 in the housing 2 on a circular path.
In Figur 4 ist die ideale Bewegungsbahn 46 eines polygonförmigen Rings 48 gezeigt. Der polygonförmige Ring 48 ist, wie vorab geschildert, auf einer in Figur 4 nicht dargestellten exzentrisch ausgebildeten Antriebswelle gleitend gelagert. Die Exzentrizität ist in Figur 4 mit E bezeichnet. In dem Ring 48 ist ein Stift 44 mit einem Durchmesser 45 befestigt. Der Stift 44 ragt mit seinem freien Ende in eine Bohrung 50, die in einem nicht dargestellten Gehäuse vorgesehen ist und einen Durchmesser 51 hat. In der Mitte der Bohrung 50 ist ein Stift 47 angeordnet, der im Gehäuse fixiert ist und dessen Durchmesser mit 55 bezeichnet wird.FIG. 4 shows the ideal movement path 46 of a polygonal ring 48. The polygonal ring 48 is, as previously described, on an eccentrically designed drive shaft, not shown in FIG slidably mounted. The eccentricity is designated E in FIG. 4. A pin 44 with a diameter 45 is fastened in the ring 48. The pin 44 projects with its free end into a bore 50 which is provided in a housing (not shown) and has a diameter 51. In the middle of the bore 50, a pin 47 is arranged, which is fixed in the housing and the diameter of which is designated 55.
Im Idealfall hat der Kreis 46 einen Durchmesser, der dem Zweifachen der Exzentrizität E, also dem Kolbenhub, entspricht. Der Durchmesser 51 der Bohrung 50 entspricht idealerweise der Summe aus dem Kolbenhub und dem Durchmesser des Stifts 44 in dem Ring 48. In der Praxis werden die Idealmaße noch mit den üblichenIn the ideal case, the circle 46 has a diameter which corresponds to twice the eccentricity E, that is to say the piston stroke. The diameter 51 of the bore 50 ideally corresponds to the sum of the piston stroke and the diameter of the pin 44 in the ring 48. In practice, the ideal dimensions are still the usual ones
Fertigungstoleranzen beaufschlagt. Zudem muß das Spiel zwischen .Antriebswelle und Ring berücksichtigt werden.Manufacturing tolerances applied. In addition, the play between the drive shaft and the ring must be taken into account.
In Figur 2 ist gezeigt, daß ein Mittenversatz M vorgesehen ist, um die Belastung der Kolben 12 zu minimieren. DieIt is shown in FIG. 2 that a center offset M is provided in order to minimize the load on the pistons 12. The
Erfindung hat nun nicht nur den Vorteil, daß das Drehmoment des Rings 8 von dem Stift 26 aufgenommen wird, sondern zusätzlich den Vorteil, daß der Mittenversatz M wegfallen kann. Dies hat zur Folge, daß für Links- und Rechtslauf der erfindungsgemäßen Radialkolbenpumpe das gleicheThe invention now has not only the advantage that the torque of the ring 8 is absorbed by the pin 26, but also the advantage that the center offset M can be eliminated. This has the consequence that the same thing for left and right-hand rotation of the radial piston pump according to the invention
Pumpengehäuse verwendet werden kann. Dadurch verringern sich die Kosten und die Logistik wird einfacher.Pump housing can be used. This reduces costs and logistics become easier.
Die vorliegende Erfindung liefert darüber hinaus den Vorteil, daß die Feder 20, welche die Platte 14 gegen den Ring 8 drückt, entlastet wird. Dadurch wird die Dauerhaltbarkeit der Feder 20 erhöht. Zudem werden Brüche des Käfigs 16, der die Platte 14 am Kolben 12 hält, verhindert. Dadurch wird die Qualitätssicherung im Hinblick auf Null Fehler erleichtert. Zuletzt wird darauf hingewiesen, daß auch für Teilbefüllung kein anderer Mittenversatz M des Kolbens 12 nötig ist. The present invention also provides the advantage that the spring 20, which presses the plate 14 against the ring 8, is relieved. This increases the durability of the spring 20. In addition, breaks in the cage 16, which holds the plate 14 on the piston 12, are prevented. This simplifies quality assurance with regard to zero errors. Finally, it is pointed out that no one else for partial filling Center offset M of the piston 12 is necessary.

Claims

Patentansprüche claims
1. Radialkolbenpumpe zur Kraftstoffhochdruckversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-1. Radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines, in particular in a common
Rail-Einspritzsystem, mit einer in einem Pumpengehäuse (2) exzentrisch gelagerten .Antriebswelle (4), auf der ein Ring (8, 48) gleitend gelagert ist, der mit vorzugsweise mehreren bezüglich der Antriebswelle (4) radial in einem jeweiligen Zylinderraum (18) angeordneten Kolben (12) zusammenwirkt, die durch Drehen der Antriebswelle (4) in dem jeweiligen Zylinderraum (18) in radialer Richtung hin und her bewegbar sind, dadurch gekennzeichnet, daß eine Führungseinrichtung (24) ein Verdrehen des Rings (18,Rail injection system, with a drive shaft (4) eccentrically mounted in a pump housing (2), on which a ring (8, 48) is slidably mounted, which preferably has a plurality of radially with respect to the drive shaft (4) in a respective cylinder space (18 ) arranged piston (12) cooperates, which can be moved back and forth in the respective cylinder space (18) by rotating the drive shaft (4), characterized in that a guide device (24) rotates the ring (18,
48) um seine eigene Achse verhindert.48) prevented on its own axis.
2. Radialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Führungseinrichtung (24) einen Vorsprung (26, 44) umfaßt, der sich zumindest teilweise parallel zur Drehachse der Antriebswelle (4) erstreckt und in eine Vertiefung (28, 50) ragt, deren Abmessungen größer als die des Vorsprungs (26, 44) sind.2. Radial piston pump according to claim 1, characterized in that the guide device (24) comprises a projection (26, 44) which extends at least partially parallel to the axis of rotation of the drive shaft (4) and projects into a recess (28, 50), the Dimensions are larger than that of the projection (26, 44).
3. Radialkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, daß der Vorsprung (26, 44) an dem Ring3. Radial piston pump according to claim 2, characterized in that the projection (26, 44) on the ring
(8, 48) und die Vertiefung (28, 50) in dem Pumpengehäuse (2) ausgebildet ist. (8, 48) and the recess (28, 50) is formed in the pump housing (2).
4. Radialkolbenpumpe nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Vorsprung (26, 44) und die Vertiefung (28, 50) jeweils die Form eines Zylinders haben, dessen Längsachse parallel zur Achse der Antriebswelle (4) ist.4. Radial piston pump according to claim 2 or 3, characterized in that the projection (26, 44) and the recess (28, 50) each have the shape of a cylinder, the longitudinal axis of which is parallel to the axis of the drive shaft (4).
5. Radialkolbenpumpe nach Anspruch 4, dadurch gekennzeichnet, daß der Durchmesser der Vertiefung5. Radial piston pump according to claim 4, characterized in that the diameter of the recess
(28, 50) dem Zweifachen der Summe aus der Exzentrizität (E) der Antriebswelle (4) und dem Radius des Vorsprungs (26, 44) entspricht.(28, 50) twice the sum of the eccentricity (E) of the drive shaft (4) and the radius of the projection (26, 44).
6. Radialkolbenpumpe nach Anspruch 4, dadurch gekennzeichnet, daß der Durchmesser (51) der Vertiefung (28, 50) etwas größer als das Zweifache der6. Radial piston pump according to claim 4, characterized in that the diameter (51) of the recess (28, 50) is slightly larger than twice the
Summe aus der Exzentrizität (E) der Antriebswelle (4) und dem Radius des Vorsprungs (26, 44) ist.Sum of the eccentricity (E) of the drive shaft (4) and the radius of the projection (26, 44).
7. Radialkolbenpumpe nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß der Vorsprung ein Stift7. Radial piston pump according to one of claims 2 to 6, characterized in that the projection is a pin
(26, 44) ist, der in einer Bohrung (25) in dem Pumpengehäuse (2) befestigt ist, und dadurch, daß die Vertiefung eine Bohrung (28, 50) ist.(26, 44), which is fixed in a bore (25) in the pump housing (2), and in that the recess is a bore (28, 50).
8. Radialkolbenpumpe nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß die Vertiefung (28, 50) ringförmig ausgebildet ist.8. Radial piston pump according to one of claims 2 to 7, characterized in that the recess (28, 50) is annular.
9. Radialkolbenpumpe nach Anspruch 8, dadurch gekennzeichnet, daß die Vertiefung eine Bohrung (28,9. Radial piston pump according to claim 8, characterized in that the recess has a bore (28,
50) ist, in der ein Stift (47) befestigt ist.50) in which a pin (47) is fastened.
10. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß radial zu der Antriebswelle (4) mindestens drei Kolben (12) angeordnet sind, wobei an dem zu der Antriebswelle (4) gerichteten Ende eines jeden Kolbens (12) durch einen Käfig (16) eine Platte (14) gehalten ist, die sich in Kontakt mit einer Abflachung ( 10) befindet, die an dem Ring (8, 48) ausgebildet ist. 10. Radial piston pump according to one of the preceding claims, characterized in that at least three pistons (12) are arranged radially to the drive shaft (4), on which to the drive shaft (4) directed end of each piston (12) is held by a cage (16) a plate (14) which is in contact with a flat (10) formed on the ring (8, 48).
EP98965060A 1998-01-16 1998-11-05 Radial piston pump for high pressure fuel supply Withdrawn EP1047875A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19801398 1998-01-16
DE19801398A DE19801398A1 (en) 1998-01-16 1998-01-16 Radial piston pump for the fuel delivery to a motor fuel injection system
PCT/DE1998/003222 WO1999036697A1 (en) 1998-01-16 1998-11-05 Radial piston pump for high pressure fuel supply

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EP1047875A1 true EP1047875A1 (en) 2000-11-02

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US (1) US6446604B1 (en)
EP (1) EP1047875A1 (en)
JP (1) JP2002509223A (en)
DE (1) DE19801398A1 (en)
WO (1) WO1999036697A1 (en)

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DE19801398A1 (en) 1999-07-22
US6446604B1 (en) 2002-09-10
JP2002509223A (en) 2002-03-26

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