EP1058001B1 - High pressure feed pump - Google Patents

High pressure feed pump Download PDF

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Publication number
EP1058001B1
EP1058001B1 EP00109323A EP00109323A EP1058001B1 EP 1058001 B1 EP1058001 B1 EP 1058001B1 EP 00109323 A EP00109323 A EP 00109323A EP 00109323 A EP00109323 A EP 00109323A EP 1058001 B1 EP1058001 B1 EP 1058001B1
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EP
European Patent Office
Prior art keywords
rolling ring
recesses
cutouts
feed pump
eccentric
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
Application number
EP00109323A
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German (de)
French (fr)
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EP1058001A1 (en
Inventor
Fritz Spinnler
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CRT Common Rail Technologies AG
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CRT Common Rail Technologies AG
CRT Common Rail Tech AG
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Publication of EP1058001A1 publication Critical patent/EP1058001A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps 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
    • F02M59/10Pumps 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
    • F02M59/102Mechanical drive, e.g. tappets or cams

Definitions

  • the present invention relates to a feed pump for high pressures and in particular the drive of feed pumps, which work on the reciprocating principle.
  • High-pressure feed pump have one with respect to the piston diameter relatively long piston stroke and are therefore suitable to generate high pressures.
  • Such high pressure pumps For example, for the generation of the Injection pressure in fuel injection systems (e.g. Common rail) used for internal combustion engines.
  • a High-pressure pump is, for example, in EP-A-881 380 A1 discloses.
  • High-pressure feed pumps of this type have one High pressure cylinder or plunger cylinder and a in this reciprocating cylindrical delivery piston or plunger, wherein the volume of the delivery chamber within the high-pressure cylinder by the lifting movement of the Plunger is changed.
  • the pumping chamber via a filling valve with a Reservoir for a pumped medium connectable to the in Stroke volume increasing delivery chamber with the fluid to fill.
  • the pressure in the delivery chamber increases until a pressure valve opens and thereby the delivery chamber with connects a high pressure room.
  • a generic high pressure feed pump is disclosed in US-A-4,184,817 described.
  • This high-pressure pump has a delivery piston, which in a High pressure cylinder is movable back and forth and on a contact surface of a rotatably mounted on an eccentric Abroll ring rests.
  • the rolling ring points a radially outwardly open U-shaped cross-section with an axially centered arranged on the contact surface forming recess.
  • the circulating Recess serves for the axial positioning of the delivery piston.
  • the drive of the plunger is effected by an eccentric drive, the one mounted on an eccentric shaft eccentric comprises, on which a rolling ring rotatably mounted is.
  • the prestressed Delivery piston with a provided at one end plate-like extension of the rolling ring on. Due to the force conditions when passing through the Upper and lower dead center, the rolling ring rotates this back and forth and changes per revolution of the eccentric shaft twice its direction of rotation. This can be at high Speed of the drive shaft to damage to the components of the eccentric drive.
  • the rolling ring has at least one recess or recess on, so that the moment of inertia the Abdicalzrings is reduced with respect to its axis of rotation. This reduction of the moment of inertia will also the acceleration torque of Abdozenslzrings at a change of direction reduced, causing damage to the Eccentric drive especially in the area of a contact surface be avoided between Abdozenslzring and delivery piston.
  • the recess or Recess formed on the outer circumference of the Abracelzringes be.
  • the stability of the Abracelzringes not reduced, but at the same time the moment of inertia can be reduced.
  • the Abracelzring on its outer circumference and axially outside of Area of the contact surface at least one circumferential recess on.
  • the rolling ring lowered symmetrically outside the area of the contact surface, which in turn does not reduce stability, However, the moment of inertia and thus also the acceleration torque is reduced when the direction of rotation changes.
  • the rolling ring has two revolving rings Having recesses, which the contact surface border laterally, and each at the outer edge of the Abroll ring are provided. This is a symmetrical Arrangement created in terms of reduction of the moment of inertia is optimized. In this embodiment is only in the area of the contact surface the required outer diameter of the Abisselzringes available. Outside the contact surface is the Abconsultedlzring reduced mass.
  • FIG. 1 shows a longitudinal section through a high-pressure feed pump with a housing 4 into which a high-pressure cylinder 8 is inserted, in which a delivery piston 9 back and can move.
  • the high pressure cylinder 8 is of a Base body 11 is clamped in the housing 4, by means of Bolt 18 and 18 'is screwed into the housing 4.
  • an inlet valve 12 In the base body 11 is also an inlet valve 12 as well an exhaust valve 13 is provided, wherein the exhaust valve 13 opens the passage to a high-pressure vessel 14 and concludes.
  • the housing 4 of the high pressure pump is also a Exzentertrieb provided which has a drive shaft 3, the bearings 5 and 5 'freely about a rotation axis 1 is rotatably supported.
  • the drive shaft 3 carries between the bearings 5, 5 'one with respect to the axis of rotation 1 of the drive shaft 3 arranged eccentrically Eccentric 6, the center axis 2 parallel to the axis of rotation 1 of the drive shaft 3 extends.
  • On the eccentric pin 6 is a cambered on its outer circumference Abrolling ring 7 rotatably mounted relative to the eccentric pin 6.
  • the delivery piston 9 is slidable slidably guided.
  • the delivery piston 9 has at its the drive shaft 3 facing the end of a plate-like extension 15, which sits on the rolling ring 7.
  • there reference numeral 16 denotes the contact point or Contact surface between the rolling ring 7 and the extended End 15 of the delivery piston 9.
  • the Delivery piston 9 For compression and delivery of a pumped medium is the Delivery piston 9 through the eccentric drive 3, 6, 7 up and down emotional.
  • the delivery piston 9 at a Gear moved down the delivery chamber of the high-pressure cylinder fills 8 via the inlet valve 12 with the fluid.
  • the delivery piston 9 at a following Delivery stroke moves upwards, the pressure in the delivery chamber increases with closed inlet valve 12 to the exhaust valve 13 opens and thereby the delivery chamber with the high-pressure vessel 14 connects.
  • the fluid is in the Promoted high pressure vessel 14.
  • Figure 2 shows a section along the line II-II of Figure 1, wherein the contact surface 16 along this cutting plane hatched. As you can see, is at high pressure loads of the delivery piston 9 against the rolling ring 7 occurring contact surface 16 elliptical, since the rolling ring 7 is slightly cambered.
  • Figures 3 and 4 illustrate the operation of the Exzentertriebes and the movement of the rolling ring 7 at Passing through the top and bottom dead center.
  • figure 3 shows the delivery piston 9 in the top dead center position. at a progressive rotation of the eccentric pin 6 or the drive shaft 3 in the illustrated counterclockwise direction the contact surface 16 in FIG. 3 moves to the left, whereby the rolling ring 7 rotates clockwise. This is because the bias of the spring 17 and the Pressure in the pumping chamber in the area of the top dead center position on largest, so that the force exerted by the spring 17 greater than the sliding frictional force between the plate 15th and the rolling ring 7 is.
  • FIG. 4 shows the bottom dead center position of the delivery piston 9. Moves the eccentric pin 6 in the direction of this lower Dead center, so the contact surface 16 moves in Figure to the right, whereby the rolling ring 7 a rotational movement in the counterclockwise direction. This is in turn, that the force exerted by the spring 17 also in the area of the bottom dead center position greater than the Gleitreibungskraft between the plate 15 and the Abconsultedlzring 7 is.
  • the rolling ring 7 thus moves relative to the plate 15th during the rotational movement of the eccentric 6 back and forth and changes its direction of rotation per revolution of the drive shaft 3 twice. This leads at high speed of the drive shaft 3, because the rotational direction change frequency of the Abroll ring 7 and thus also its acceleration torque increases. In the worst case takes place between the plate 15 and the rolling ring 7 at spin peaks Slip instead, which can lead to damage.
  • a rolling ring 7 ' is provided, as shown in FIG 5 is shown in cross section.
  • the rolling ring 7 ' corresponds essentially the Abdozens of the Abdozens of the Abdozens of the Abdozens of the Abdozens of the Abdozens of the Abdozens of the Abdozensringes 7 'two Recesses or recesses 20, 22 are provided.
  • the Recesses 20, 22 are located axially outside the range the contact surface 16 and are each on the outside Edge of Abicalzringes 7 'provided.
  • the recesses 20, 22 of the rolling ring 7 ' are seen in cross section about rectangular.
  • the inventive Abracelzring has a lower Moment of inertia and a correspondingly lower acceleration moment, what a higher rotation change frequency of Abicalzrings, a higher speed of Drive shaft and thus a higher flow rate of High pressure pump allows without the rolling ring 7 'on the plate 15 slides at spin peaks.
  • a Hochdruckpörderpume with an inventive Exzentertrieb can therefore be operated at higher speeds, without damage to the components of the eccentric drive or excessive wear occurs.

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  • 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)

Description

Die vorliegende Erfindung betrifft eine Förderpumpe für hohe Drücke und insbesondere den Antrieb von Förderpumpen, die nach dem Hubkolben-Prinzip arbeiten. Hochdruckförderpumpen haben einen im bezug auf den Kolbendurchmesser verhältnismässig langen Kolbenhub und sind deshalb geeignet, hohe Drücke zu erzeugen. Solche Hochdruckförderpumpen werden beispielsweise für die Erzeugung des Einspritzdruckes in Kraftstoff-Einspritzsystemen (z.B. Common-Rail) für Verbrennungsmotoren eingesetzt. Eine Hochdruckförderpumpe ist beispielsweise in der EP-A-881 380 A1 offenbart.The present invention relates to a feed pump for high pressures and in particular the drive of feed pumps, which work on the reciprocating principle. High-pressure feed pump have one with respect to the piston diameter relatively long piston stroke and are therefore suitable to generate high pressures. Such high pressure pumps For example, for the generation of the Injection pressure in fuel injection systems (e.g. Common rail) used for internal combustion engines. A High-pressure pump is, for example, in EP-A-881 380 A1 discloses.

Hochdruckförderpumpen dieser Art weisen einen Hochdruckzylinder bzw. Plungerzylinder und einen in diesem hin- und herbewegbaren zylindrischen Förderkolben bzw. Plungerkolben auf, wobei das Volumen des Förderraums innerhalb des Hochdruckzylinders durch die Hubbewegung des Plungerkolbens verändert wird. Bei einem Füllhub des Plungerkolbens ist der Förderraum über ein Füllventil mit einem Vorratsraum für ein Fördermedium verbindbar, um den im Hubvolumen sich vergrössernden Förderraum mit dem Fördermedium zu füllen. Während eines folgenden Förderhubs bei geschlossenem Füllventil steigt der Druck im Förderraum bis ein Druckventil öffnet und dadurch den Förderraum mit einem Hochdruckraum verbindet. Die genaue Ausgestaltung der Hochdruckpumpe ist in der genannten EP-A-0 881 380 A1 beschrieben, deren Offenbarung durch diese Bezugnahme ausdrücklich zum Inhalt der vorliegenden Anmeldung gemacht wird. High-pressure feed pumps of this type have one High pressure cylinder or plunger cylinder and a in this reciprocating cylindrical delivery piston or plunger, wherein the volume of the delivery chamber within the high-pressure cylinder by the lifting movement of the Plunger is changed. At a filling stroke of the plunger is the pumping chamber via a filling valve with a Reservoir for a pumped medium connectable to the in Stroke volume increasing delivery chamber with the fluid to fill. During a subsequent delivery stroke at closed filling valve, the pressure in the delivery chamber increases until a pressure valve opens and thereby the delivery chamber with connects a high pressure room. The exact design the high pressure pump is in said EP-A-0 881 380 A1 described their disclosure by this reference expressly to the content of the present application becomes.

Eine gattungsgemässe Hochdruckförderpumpe ist in der US-A-4 184 817 beschrieben. Diese Hochdruckförderpumpe besitzt einen Förderkolben, der in einem Hochdruckzylinder hin und her bewegbar ist und auf einer Kontaktfläche eines drehbar auf einem Excenter gelagerten Abwälzringes anliegt. Der Abwälzring weist einen radial nach aussen geöffneten U-förmigen Querschnitt mit einer axial mittig angeordneten, die Kontaktfläche bildenden Ausnehmung auf. Die umlaufende Ausnehmung dient dabei der axialen Positionierung des Förderkolbens. A generic high pressure feed pump is disclosed in US-A-4,184,817 described. This high-pressure pump has a delivery piston, which in a High pressure cylinder is movable back and forth and on a contact surface of a rotatably mounted on an eccentric Abroll ring rests. The rolling ring points a radially outwardly open U-shaped cross-section with an axially centered arranged on the contact surface forming recess. The circulating Recess serves for the axial positioning of the delivery piston.

Der Antrieb des Plungerkolbens erfolgt durch einen Exzentertrieb, der einen auf einer Exzenterwelle gelagerten Exzenter umfasst, auf dem ein Abwälzring drehbar gelagert ist. Während der Drehung des Exzenters liegt der vorgespannte Förderkolben mit einer an seinem einen Ende vorgesehenen tellerartigen Erweiterung an dem Abwälzring an. Aufgrund der Kraftverhältnisse beim Durchgang durch den oberen und unteren Totpunkt dreht sich der Abwälzring hierbei hin und her und wechselt pro Umdrehung der Exzenterwelle zweimal seine Drehrichtung. Dies kann bei hoher Drehzahl der Antriebswelle zu Beschädigungen an den Bauteilen des Exzentertriebs führen.The drive of the plunger is effected by an eccentric drive, the one mounted on an eccentric shaft eccentric comprises, on which a rolling ring rotatably mounted is. During the rotation of the eccentric is the prestressed Delivery piston with a provided at one end plate-like extension of the rolling ring on. Due to the force conditions when passing through the Upper and lower dead center, the rolling ring rotates this back and forth and changes per revolution of the eccentric shaft twice its direction of rotation. This can be at high Speed of the drive shaft to damage to the components of the eccentric drive.

Es ist deshalb eine Aufgabe der vorliegenden Erfindung, eine Hochdruckförderpumpe zu schaffen, die auch bei hoher Drehzahl störungsfrei arbeitet.It is therefore an object of the present invention to create a high-pressure pump, which is also at high Speed works troublefree.

Diese Aufgabe wird mit einer Hochdruckförderpumpe gelöst, welche die Merkmale des Anspruchs 1 aufweist.This task is solved with a high-pressure pump, which has the features of claim 1.

Erfindungsgemäss weist der Abwälzring zumindest eine Ausnehmung oder Aussparung auf, so dass das Trägheitsmoment des Abwälzrings bezüglich seiner Drehachse reduziert ist. Durch diese Verringerung des Trägheitsmomentes wird auch das Beschleunigungsmoment des Abwälzrings bei einer Drehrichtungsänderung reduziert, wodurch Beschädigungen des Exzentertriebs insbesondere im Bereich einer Kontaktfläche zwischen Abwälzring und Förderkolben vermieden werden.According to the invention, the rolling ring has at least one recess or recess on, so that the moment of inertia the Abwälzrings is reduced with respect to its axis of rotation. This reduction of the moment of inertia will also the acceleration torque of Abwälzrings at a change of direction reduced, causing damage to the Eccentric drive especially in the area of a contact surface be avoided between Abwälzring and delivery piston.

Hierdurch ist es möglich eine gattungsgemässe Hochdruckförderpumpe mit höheren Drehzahlen als bisher zu betreiben, ohne dass der nachteilige Effekt einer Gleitbewegung zwischen dem Abwälzring und dem Kolbenfuss auftritt. Ferner bringt die Verringerung des Trägheitsmoments und damit der Gesamtmasse des Abwälzrings insgesamt eine Entlastung der Exzentertriebkonstruktion mit sich, da auch die Lager der Antriebswelle geringeren Belastungen ausgesetzt werden.This makes it possible a generic high pressure pump operate at higher speeds than before, without the adverse effect of sliding movement occurs between the rolling ring and the piston foot. Further brings the reduction of the moment of inertia and thus the total mass of Abwälzrings total relief the Exzentertriebkonstruktion with it, as well as the bearings the drive shaft to be subjected to lower loads.

Vorteilhafte Ausführungsformen der Erfindung sind in der Beschreibung, den Figuren sowie den Unteransprüchen beschrieben.Advantageous embodiments of the invention are in the Description, the figures and the subclaims described.

Nach einer ersten Ausführungsform kann die Ausnehmung oder Aussparung am Aussenumfang des Abwälzringes ausgebildet sein. Hierdurch wird die Stabilität des Abwälzringes nicht verringert, wobei jedoch gleichzeitig das Trägheitsmoment reduziert werden kann.According to a first embodiment, the recess or Recess formed on the outer circumference of the Abwälzringes be. As a result, the stability of the Abwälzringes not reduced, but at the same time the moment of inertia can be reduced.

Nach einer weiteren Ausbildung der Erfindung weist der Abwälzring an seinem Aussenumfang und axial ausserhalb des Bereiches der Kontaktfläche zumindest eine umlaufende Ausnehmung auf. Bei dieser Ausführungsform ist der Abwälzring ausserhalb des Bereiches der Kontaktfläche symmetrisch abgesenkt, wodurch wiederum die Stabilität nicht verringert, jedoch das Trägheitsmoment und damit auch das Beschleunigungsmoment bei Drehrichtungsänderungen reduziert ist.According to a further embodiment of the invention, the Abwälzring on its outer circumference and axially outside of Area of the contact surface at least one circumferential recess on. In this embodiment, the rolling ring lowered symmetrically outside the area of the contact surface, which in turn does not reduce stability, However, the moment of inertia and thus also the acceleration torque is reduced when the direction of rotation changes.

Besonders vorteilhaft ist es, wenn der Abwälzring zwei umlaufende Ausnehmungen aufweist, welche die Kontaktfläche seitlich begrenzen, und die jeweils am äusseren Rand des Abwälzringes vorgesehen sind. Hierdurch ist eine symmetrische Anordnung geschaffen, die hinsichtlich der Verringerung des Trägheitsmomentes optimiert ist. Bei dieser Ausführungsform ist lediglich im Bereich der Kontaktfläche der erforderliche Aussendurchmesser des Abwälzringes vorhanden. Ausserhalb der Kontaktfläche ist der Abwälzring massenreduziert.It is particularly advantageous if the rolling ring has two revolving rings Having recesses, which the contact surface border laterally, and each at the outer edge of the Abroll ring are provided. This is a symmetrical Arrangement created in terms of reduction of the moment of inertia is optimized. In this embodiment is only in the area of the contact surface the required outer diameter of the Abwälzringes available. Outside the contact surface is the Abwälzring reduced mass.

Nachfolgend wird die Erfindung anhand einer vorteilhaften Ausführungsform rein beispielhaft und unter Bezugnahme auf die beigefügten Figuren näher erläutert. Es zeigen:

Fig. 1
eine Schnittansicht einer Hochdruckförderpumpe mit einem Exzentertrieb;
Fig. 2
eine Schnittansicht entlang der in Fig. 1 gezeigten Ebene II-II, welche die Kontaktfläche zwischen dem Abwälzring und dem Förderkolben darstellt;
Fig. 3
eine Schnittansicht eines Exzentertriebs in der oberen Totpunktlage des Föderkolbens;
Fig. 4
eine Schnittansicht eines Exzentertriebs in der unteren Totpunktlage des Föderkolbens; und
Fig. 5
eine Schnittansicht eines Abwälzrings gemäss der vorliegenden Erfindung.
The invention will be explained in more detail below by way of example with reference to an advantageous embodiment and with reference to the attached figures. Show it:
Fig. 1
a sectional view of a high-pressure pump with an eccentric drive;
Fig. 2
a sectional view taken along the plane shown in Figure 1 II-II, which represents the contact surface between the Abwälzring and the delivery piston.
Fig. 3
a sectional view of a Exzentertriebs in the top dead center of the Föderkolbens;
Fig. 4
a sectional view of an eccentric drive in the bottom dead center of the Föderkolbens; and
Fig. 5
a sectional view of a Abwälzrings according to the present invention.

Figur 1 zeigt einen Längsschnitt durch eine Hochdruckförderpumpe mit einem Gehäuse 4, in das ein Hochdruckzylinder 8 eingelassen ist, in dem sich ein Förderkolben 9 hin und her bewegen kann. Der Hochdruckzylinder 8 ist von einem Grundkörper 11 in dem Gehäuse 4 eingespannt, der mittels Schraubbolzen 18 und 18' in dem Gehäuse 4 verschraubt ist. In dem Grundkörper 11 ist ferner ein Einlassventil 12 sowie ein Auslassventil 13 vorgesehen, wobei das Auslassventil 13 den Durchgang zu einem Hochdruckbehälter 14 öffnet und schliesst.FIG. 1 shows a longitudinal section through a high-pressure feed pump with a housing 4 into which a high-pressure cylinder 8 is inserted, in which a delivery piston 9 back and can move. The high pressure cylinder 8 is of a Base body 11 is clamped in the housing 4, by means of Bolt 18 and 18 'is screwed into the housing 4. In the base body 11 is also an inlet valve 12 as well an exhaust valve 13 is provided, wherein the exhaust valve 13 opens the passage to a high-pressure vessel 14 and concludes.

In dem Gehäuse 4 der Hochdruckförderpumpe ist ferner ein Exzentertrieb vorgesehen, der eine Antriebswelle 3 aufweist, die über Lager 5 und 5' frei um eine Rotationsachse 1 drehbar abgestützt ist. Die Antriebswelle 3 trägt zwischen den Lagerstellen 5, 5' einen bezüglich der Rotationsachse 1 der Antriebswelle 3 exzentrisch angeordneten Exzenterzapfen 6, dessen Zentrumsachse 2 parallel zur Rotationsachse 1 der Antriebswelle 3 verläuft. Auf dem Exzenterzapfen 6 ist ein an seinem Aussenumfang bombierter Abwälzring 7 drehbar gegenüber dem Exzenterzapfen 6 gelagert.In the housing 4 of the high pressure pump is also a Exzentertrieb provided which has a drive shaft 3, the bearings 5 and 5 'freely about a rotation axis 1 is rotatably supported. The drive shaft 3 carries between the bearings 5, 5 'one with respect to the axis of rotation 1 of the drive shaft 3 arranged eccentrically Eccentric 6, the center axis 2 parallel to the axis of rotation 1 of the drive shaft 3 extends. On the eccentric pin 6 is a cambered on its outer circumference Abrolling ring 7 rotatably mounted relative to the eccentric pin 6.

In einer im wesentlichen kreiszylinderförmigen Bohrung 10 des Hochdruckzylinders 8 ist der Förderkolben 9 gleitend verschiebbar geführt. Der Förderkolben 9 weist an seinem der Antriebswelle 3 zugewandten Ende eine tellerartige Erweiterung 15 auf, die auf dem Abwälzring 7 aufsitzt. Dabei bezeichnet das Bezugszeichen 16 die Berührungsstelle bzw. Kontaktfläche zwischen dem Abwälzring 7 und dem erweiterten Ende 15 des Förderkolbens 9. Mittels einer Druckfeder 17, die sich einerseits am Hochdruckzylinder 8 und andererseits auf dem Teller 15 abstützt, wird der Förderkolben 9 gegen den Abwälzring 7 vorgespannt.In a substantially circular cylindrical bore 10th of the high-pressure cylinder 8, the delivery piston 9 is slidable slidably guided. The delivery piston 9 has at its the drive shaft 3 facing the end of a plate-like extension 15, which sits on the rolling ring 7. there reference numeral 16 denotes the contact point or Contact surface between the rolling ring 7 and the extended End 15 of the delivery piston 9. By means of a compression spring 17, on the one hand on the high-pressure cylinder 8 and on the other supported on the plate 15, the delivery piston 9 biased against the rolling ring 7.

Zur Kompression und Förderung eines Fördermediums wird der Förderkolben 9 durch den Exzentertrieb 3, 6, 7 auf und ab bewegt. Wenn sich der Förderkolben 9 bei einem Füllhub nach unten bewegt, füllt sich der Förderraum des Hochdruckzylinders 8 über das Einlassventil 12 mit dem Fördermedium. Wenn sich der Förderkolben 9 bei einem folgenden Förderhub nach oben bewegt, steigt der Druck im Förderraum bei geschlossenem Einlassventil 12 bis das Auslassventil 13 öffnet und dadurch den Förderraum mit dem Hochdruckbehälter 14 verbindet. Dabei wird das Fördermedium in den Hochdruckbehälter 14 gefördert.For compression and delivery of a pumped medium is the Delivery piston 9 through the eccentric drive 3, 6, 7 up and down emotional. When the delivery piston 9 at a Füllhub moved down, the delivery chamber of the high-pressure cylinder fills 8 via the inlet valve 12 with the fluid. When the delivery piston 9 at a following Delivery stroke moves upwards, the pressure in the delivery chamber increases with closed inlet valve 12 to the exhaust valve 13 opens and thereby the delivery chamber with the high-pressure vessel 14 connects. The fluid is in the Promoted high pressure vessel 14.

Figur 2 zeigt einen Schnitt entlang der Linie II-II von Figur 1, wobei die Kontaktfläche 16 entlang dieser Schnittebene schraffiert dargestellt ist. Wie zu erkennen ist, ist die bei hohen Druckbelastungen des Förderkolbens 9 gegen den Abwälzring 7 auftretende Kontaktfläche 16 ellipsenartig, da der Abwälzring 7 leicht bombiert ist.Figure 2 shows a section along the line II-II of Figure 1, wherein the contact surface 16 along this cutting plane hatched. As you can see, is at high pressure loads of the delivery piston 9 against the rolling ring 7 occurring contact surface 16 elliptical, since the rolling ring 7 is slightly cambered.

Die Figuren 3 und 4 verdeutlichen die Funktionsweise des Exzentertriebes sowie die Bewegung des Abwälzringes 7 bei Durchlaufen der oberen und der unteren Totpunktlage. Figur 3 zeigt den Förderkolben 9 in der oberen Totpunktlage. Bei einer fortschreitenden Drehung des Exzenterzapfens 6 bzw. der Antriebswelle 3 im dargestellten Gegenuhrzeigersinn bewegt sich die Kontaktfläche 16 in Figur 3 nach links, wodurch der Abwälzring 7 im Uhrzeigersinn rotiert. Dies liegt daran, dass die Vorspannung der Feder 17 und der Druck im Förderraum im Bereich der oberen Totpunktlage am grössten ist, so dass die von der Feder 17 ausgeübte Kraft grösser als die Gleitreibungskraft zwischen dem Teller 15 sowie dem Abwälzring 7 ist.Figures 3 and 4 illustrate the operation of the Exzentertriebes and the movement of the rolling ring 7 at Passing through the top and bottom dead center. figure 3 shows the delivery piston 9 in the top dead center position. at a progressive rotation of the eccentric pin 6 or the drive shaft 3 in the illustrated counterclockwise direction the contact surface 16 in FIG. 3 moves to the left, whereby the rolling ring 7 rotates clockwise. This is because the bias of the spring 17 and the Pressure in the pumping chamber in the area of the top dead center position on largest, so that the force exerted by the spring 17 greater than the sliding frictional force between the plate 15th and the rolling ring 7 is.

Figur 4 zeigt die untere Totpunktlage des Förderkolbens 9. Bewegt sich der Exzenterzapfen 6 in Richtung dieser unteren Totpunktlage, so bewegt sich die Kontaktfläche 16 in Figur nach rechts, wodurch der Abwälzring 7 eine Rotationsbewegung im Gegenuhrzeigersinn durchführt. Dies liegt wiederum daran, dass die von der Feder 17 ausgeübte Kraft auch im Bereich der unteren Totpunktlage grösser als die Gleitreibungskraft zwischen dem Teller 15 und dem Abwälzring 7 ist.FIG. 4 shows the bottom dead center position of the delivery piston 9. Moves the eccentric pin 6 in the direction of this lower Dead center, so the contact surface 16 moves in Figure to the right, whereby the rolling ring 7 a rotational movement in the counterclockwise direction. This is in turn, that the force exerted by the spring 17 also in the area of the bottom dead center position greater than the Gleitreibungskraft between the plate 15 and the Abwälzring 7 is.

Der Abwälzring 7 bewegt sich somit relativ zum Teller 15 während der Drehbewegung des Exzenters 6 hin und her und ändert seine Drehrichtung pro Umdrehung der Antriebswelle 3 zweimal. Dies führt bei hoher Drehzahl der Antriebswelle 3 zu Problemen, da die Drehrichtungsänderungsfrequenz des Abwälzringes 7 und somit auch dessen Beschleunigungsmoment ansteigt. Im ungünstigsten Fall findet zwischen dem Teller 15 und dem Abwälzring 7 bei Drehbeschleunigungsspitzen ein Gleiten statt, was zu Beschädigungen führen kann.The rolling ring 7 thus moves relative to the plate 15th during the rotational movement of the eccentric 6 back and forth and changes its direction of rotation per revolution of the drive shaft 3 twice. This leads at high speed of the drive shaft 3, because the rotational direction change frequency of the Abroll ring 7 and thus also its acceleration torque increases. In the worst case takes place between the plate 15 and the rolling ring 7 at spin peaks Slip instead, which can lead to damage.

Zur Vermeidung der bei hohen Drehzahlen auftretenden Beschädigungen im Bereich der Kontaktfläche 16 ist erfindungsgemäss ein Abwälzring 7' vorgesehen, wie er in Figur 5 im Querschnitt dargestellt ist. Der Abwälzring 7' entspricht im wesentlichen dem Abwälzring 7 der Figuren 1 bis 4, wobei jedoch am Aussenumfang des Abwälzringes 7' zwei Ausnehmungen bzw. Aussparungen 20, 22 vorgesehen sind. Die Aussparungen 20, 22 befinden sich axial ausserhalb des Bereichs der Kontaktfläche 16 und sind jeweils am äusseren Rand des Abwälzringes 7' vorgesehen. Die zwischen den beiden umlaufenden Ausnehmungen 20, 22 vorhandene Kontaktfläche, d.h. der vorstehende Teil des Aussenumfangs des Abwälzringes 7' ist wiederum leicht bombiert. Die Ausnehmungen 20, 22 des Abwälzringes 7' sind im Querschnitt gesehen etwa rechteckförmig.To avoid the damage occurring at high speeds in the region of the contact surface 16 is according to the invention a rolling ring 7 'is provided, as shown in FIG 5 is shown in cross section. The rolling ring 7 'corresponds essentially the Abwälzring 7 of Figures 1 to 4, but on the outer circumference of the Abwälzringes 7 'two Recesses or recesses 20, 22 are provided. The Recesses 20, 22 are located axially outside the range the contact surface 16 and are each on the outside Edge of Abwälzringes 7 'provided. The between the two circumferential recesses 20, 22 existing contact surface, i.e. the protruding part of the outer periphery of the rolling ring 7 'is again slightly cambered. The recesses 20, 22 of the rolling ring 7 'are seen in cross section about rectangular.

Der erfindungsgemässe Abwälzring besitzt ein geringeres Trägheitsmoment und ein dementsprechend geringeres Beschleunigungsmoment, was eine höhere Drehrichtungsänderungsfrequenz des Abwälzrings, eine höhere Drehzahl der Antriebswelle und damit eine höhere Förderleistung der Hochdruckpumpe ermöglicht, ohne dass der Abwälzring 7' auf dem Teller 15 bei Drehbeschleunigungsspitzen gleitet. Eine Hochdruckförderpume mit einem erfindungsgemässen Exzentertrieb kann deshalb mit höheren Drehzahlen betrieben werden, ohne dass an den Bauteilen des Exzentertriebes Beschädigungen oder übermässiger Verschleiss auftritt.The inventive Abwälzring has a lower Moment of inertia and a correspondingly lower acceleration moment, what a higher rotation change frequency of Abwälzrings, a higher speed of Drive shaft and thus a higher flow rate of High pressure pump allows without the rolling ring 7 'on the plate 15 slides at spin peaks. A Hochdruckpörderpume with an inventive Exzentertrieb can therefore be operated at higher speeds, without damage to the components of the eccentric drive or excessive wear occurs.

Claims (6)

  1. High-pressure feed pump having a high-pressure cylinder (8), a feed piston (9) displaceable therein, and an eccentric (6) arranged on a drive shaft (3), on which eccentric (3) a rolling ring (7'), which has in its outer circumference a circumferential recess or cutout (20, 22), is mounted to rotate and rests against the feed piston (9) or a part connected thereto via a contact area (16), characterised in that the rolling ring (7') has two recesses or cutouts (20, 22), each recess or cutout (20, 22) being arranged axially outside the region occupied by the contact area (16) at an outer edge of the rolling ring (7'), and the two recesses or cutouts (20, 22) laterally defining, between them, the contact area (16).
  2. High-pressure feed pump according to claim 1, characterised in that , when seen in cross-section, the recesses or cutouts (20, 22) in the rolling ring (7') are approximately rectangular.
  3. High-pressure feed pump according to claim 1 or 2, characterised in that the circumferential face of the rolling ring (7') is cambered (curved).
  4. Rolling ring (7') for a high-pressure feed pump according to one of claims 1 to 3, characterised by two recesses or cutouts (20, 22), each recess or cutout (20, 22) being arranged axially outside the region occupied by the contact area (16) at an outer edge of the rolling ring (7'), and the two recesses or cutouts (20, 22) laterally defining, between them, the contact area (16).
  5. Rolling ring according to claim 4, characterised in that , when seen in cross-section. the recesses or cutouts (20, 22) are approximately rectangular.
  6. Rolling ring according to claim 4 or 5, characterised in that the circumferential face of the rolling ring (7') is cambered (curved).
EP00109323A 1999-05-31 2000-05-02 High pressure feed pump Expired - Lifetime EP1058001B1 (en)

Applications Claiming Priority (2)

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CH101399 1999-05-31
CH101399 1999-05-31

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EP1058001B1 true EP1058001B1 (en) 2005-02-16

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EP00109323A Expired - Lifetime EP1058001B1 (en) 1999-05-31 2000-05-02 High pressure feed pump

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US (1) US6205980B1 (en)
EP (1) EP1058001B1 (en)
JP (1) JP3609693B2 (en)
DE (1) DE50009529D1 (en)
ES (1) ES2233236T3 (en)

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JP2004537005A (en) * 2001-08-08 2004-12-09 シーアールティー コモンレールテクノロジーズ エージー High pressure supply pump
US7134846B2 (en) * 2004-05-28 2006-11-14 Stanadyne Corporation Radial piston pump with eccentrically driven rolling actuation ring
DE102011082733A1 (en) * 2011-09-15 2013-03-21 Robert Bosch Gmbh Pump, in particular high-pressure fuel pump
DE102012024924A1 (en) * 2012-12-19 2014-06-26 Volkswagen Aktiengesellschaft Device for driving piston pump, such as high-pressure pumps for common rail system, of motor vehicle, has piston pump unit which has working area limiting piston, where crank drive is formed for driving piston
JP2023013759A (en) 2021-07-16 2023-01-26 株式会社Soken supply pump

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Publication number Publication date
EP1058001A1 (en) 2000-12-06
ES2233236T3 (en) 2005-06-16
DE50009529D1 (en) 2005-03-24
US6205980B1 (en) 2001-03-27
JP2000356184A (en) 2000-12-26
JP3609693B2 (en) 2005-01-12

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