EP2449261A1 - High pressure pump - Google Patents

High pressure pump

Info

Publication number
EP2449261A1
EP2449261A1 EP10718148A EP10718148A EP2449261A1 EP 2449261 A1 EP2449261 A1 EP 2449261A1 EP 10718148 A EP10718148 A EP 10718148A EP 10718148 A EP10718148 A EP 10718148A EP 2449261 A1 EP2449261 A1 EP 2449261A1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure pump
eccentric
piston
tappet
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Withdrawn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
EP10718148A
Other languages
German (de)
French (fr)
Inventor
Friedrich Boecking
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 EP2449261A1 publication Critical patent/EP2449261A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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
    • F04B1/0413—Cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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
    • 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
    • F04B1/0435—Arrangements for disconnecting the pistons from the actuated cam
    • 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
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the present invention relates to a high-pressure pump for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
  • radial piston pumps are used to build up the high pressure in a high-pressure accumulator of the common rail system for common rail systems.
  • the radial piston pumps may have one or more pump elements with respective pump pistons, which are indirectly displaced by a drive shaft, for example via a cam or an eccentric to perform a suction stroke, during which fuel is sucked into a pump working space of the high-pressure pump, and a pressure stroke, in which the sucked fuel is compressed and is output to the high-pressure accumulator of the common rail system.
  • a radial piston pump is known in which the fuel delivery via a radial piston which is actuated by an eccentric shaft, takes place.
  • Three radial pistons are evenly distributed on the outer circumference of the eccentric shaft.
  • Each of the radial pistons rests on the eccentric shaft via a sliding block and an eccentric ring.
  • the eccentric ring is rotatably mounted on the eccentric shaft via a sliding bearing.
  • DE 198 26 961 A1 describes a radial piston pump in which an eccentric shaft for driving a delivery unit is provided on one side in the pump housing. is superimposed and arranged on the freely projecting end portion of the shaft designed as a mechanical seal shaft seal.
  • the slip ring is located on an eccentric of the eccentric shaft, which is pressed by a pressure device and the form of the conveyor against the sliding ring.
  • the eccentric ring is cap-shaped and surrounds the freely projecting end portion of the eccentric shaft.
  • a high-pressure pump for a fuel injection device of an internal combustion engine which has a pump element with a pump piston which can be moved up and down in accordance with an eccentric stroke by an eccentric provided on a rotatably mounted drive shaft and an eccentric ring surrounding the eccentric a bucket tappet is arranged.
  • the concept of a high-pressure pump according to the invention is designed as a single-piston pump
  • the solution according to the invention offers a combination of a simple construction with simultaneous high-speed stability. By inserting the pump piston into the cup tappet, it can transmit the lateral forces acting on it particularly well. Also, the high pressure is only in the cylinder head and the housing of the high pressure pump carries only the mechanics and the low pressure circuit.
  • the bucket tappet is a single cup tappet.
  • the single-cup tappet provides a further improved transmission of the ben acting transverse forces and is particularly suitable for high speeds for transmitting the shear forces on the housing of the pump.
  • the high pressure pump is a single piston pump.
  • the eccentric is designed as a sinusoidal cam. It is also preferable if between the eccentric and the eccentric ring
  • the bearing is designed as a PEEK bearing.
  • PEEK bearing high speeds are possible.
  • the high speed resistance of the high pressure pump allows a high gear ratio and thus a smaller piston diameter, which in turn leads to improved efficiency.
  • the tappet is inserted into a ne formed in a housing of the high-pressure pump recess.
  • the bucket tappet on an outer wall, which rests against a wall of the housing.
  • the bucket tappet has an inner wall, which faces a shank portion of a cylinder head, in which the pump piston is arranged.
  • a spring is arranged between the inner wall of the tappet and the shaft portion.
  • Fig. 1 is a partial sectional view through a high-pressure pump according to the prior art
  • FIG. 2 shows a section through a high pressure pump according to one embodiment.
  • a high pressure pump 1 for a fuel injector is a
  • the high pressure pump 1 comprises a housing 2, which is formed in several parts, and in which a rotationally driven drive shaft 3 is arranged, on which a cam 4 is provided.
  • the high-pressure pump 1 has a pump element 6 arranged in a cylinder head 5 with a pump piston 7, which is indirectly driven by the cam 4 of the drive shaft 3 in a lifting movement in at least approximately radial direction to the rotation axis D of the drive shaft 3.
  • the pump piston 7 is guided in a cylinder bore 8 in the cylinder head 5 tightly displaceable and limited with its drive shaft 3 facing away from end face in the cylinder bore 8 a pump working chamber 9.
  • the cylinder head 5 is provided with a shaft portion 10 in which the cylinder bore 8 receiving the pump piston 7 is provided, and around which the spring 11 is disposed.
  • the pump working chamber 9 has a connection (not shown) in the housing 2 via a fuel inlet channel to a connection with a fuel feed, for example, a feed pump.
  • a fuel feed for example, a feed pump.
  • the pump working chamber 9 also has a connection extending in the cylinder head 5 fuel drain passage 14 with an outlet, which at- For example, with a high-pressure accumulator (not shown) of a common rail system is connected.
  • a high-pressure accumulator (not shown) of a common rail system is connected.
  • injectors (not shown) arranged on the cylinders of the internal combustion engine are connected to the high-pressure accumulator, through which fuel is injected into the cylinders of the internal combustion engine.
  • an outlet valve 15 opening out of the pump working space 9 is arranged.
  • the pump element 6 is associated with a plunger assembly with a hollow cylindrical roller tappet 16, a roller shoe 17 and a roller 18, via which the pump piston 7 is supported on the cam 4 of the drive shaft 3.
  • the plunger assembly and the pump piston 7 are pressed by the prestressed spring 1 1 to the cam 4 of the drive shaft 3 out.
  • the spring 1 1 is designed as the pump piston 7 surrounding helical compression spring.
  • the spring 1 1 is supported on the one hand on a housing wall of the cylinder head 5 and on the other hand on a spring plate 20 from.
  • the spring plate 20 is connected to the pump piston 7, so that the spring 1 1 acts both on the pump piston 7 and on the roller tappet 16 in order to press it against the cam 4 of the drive shaft 3.
  • the described high-pressure pump 1 according to the prior art does not produce high pressure within the housing 2, so that no high-pressure or strength-increasing measures for the housing 2 are required. Furthermore, it can be seen in FIG. 1 that the high-pressure pump 1 has a metering unit 23, and that a mounting flange 24 is provided on the housing 2.
  • FIG. 2 shows a sectional view through a high-pressure pump 1 according to an embodiment.
  • the components of the high pressure pump 1 are also arranged substantially in a multi-part housing 2 and the cylinder head 5.
  • an eccentric 21 is arranged, which is designed here as a sinusoidal cam.
  • a PEEK bearing 30 is provided between the eccentric ring 22 and the eccentric 21, to allow the high speeds.
  • a pump element 6 with a pump piston 7, which ends at one end in the pump working chamber 9 and is provided at the opposite end with a piston foot 20, respectively.
  • the pump piston 7 is arranged in a bucket tappet 26, which is designed as a single-cup tappet, which transmits the transverse forces to the housing 2, especially at high rotational speeds. The lateral forces are additionally reduced by a flow indicated by the reference numeral 29.
  • the tappet 26 is inserted into a recess 31 formed in the housing 2 of the high-pressure pump 1.
  • the tappet 26 has an outer wall 27, which on a
  • the cup tappet 26 has an inner wall 28, which is opposite to the shank portion 10 of the cylinder head 5, in which the pump piston 7 is arranged. Furthermore, in the embodiment between the inner wall 28 of the tappet 26 and the shaft portion 10, a spring 1 1 is arranged.
  • a schematically illustrated fuel overflow valve 25 is also provided in this embodiment.
  • the high pressure in the embodiment shown in Fig. 2 is applied only in the cylinder head 5, so that the housing 2 carries only the mechanics and the low-pressure circuit.
  • the high-pressure pump 1 according to the invention offers a particularly advantageous combination of a simple design with simultaneous high rotational speed, the high rotational speed in turn allows a high translation and thus a smaller piston diameter, which in turn leads to an improvement in the efficiency of the high-pressure pump 1.

Abstract

The invention relates to a high-pressure pump (1) for a fuel injection device of an internal combustion engine, which has a pump element (6) with a pump piston (7) which, by means of an eccentric (21) provided on a rotatably mounted drive shaft (3) and an eccentric ring (22), can be moved up and down in accordance with an eccentric stroke, wherein the pump piston (7) is arranged in a bucket tappet (26).

Description

Beschreibung  description
Titel title
Hochdruckpumpe Die vorliegende Erfindung betrifft eine Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1. The present invention relates to a high-pressure pump for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
Stand der Technik State of the art
Im Stand der Technik werden für Common Rail Systeme unter anderem Radialkolbenpumpen zum Aufbau des Hochdrucks in einem Hochdruckspeicher des Common Rail Systems verwendet. Die Radialkolbenpumpen können eines oder mehrere Pumpenelemente mit jeweiligen Pumpenkolben aufweisen, welche von einer Antriebswelle mittelbar beispielsweise über einen Nocken oder einen Exzenter in eine Hubbewegung versetzt werden, um einen Saughub, während welchem Kraftstoff in einen Pumpenarbeitsraum der Hochdruckpumpe eingesaugt wird, und einen Druckhub auszuführen, in welchem der angesaugte Kraftstoff komprimiert wird und an den Hochdruckspeicher des Common Rail Systems ausgegeben wird. In the prior art, among others, radial piston pumps are used to build up the high pressure in a high-pressure accumulator of the common rail system for common rail systems. The radial piston pumps may have one or more pump elements with respective pump pistons, which are indirectly displaced by a drive shaft, for example via a cam or an eccentric to perform a suction stroke, during which fuel is sucked into a pump working space of the high-pressure pump, and a pressure stroke, in which the sucked fuel is compressed and is output to the high-pressure accumulator of the common rail system.
Aus DE 43 05 791 A1 ist eine Radialkolbenpumpe bekannt, bei der die Kraftstoffförderung über einen Radialkolben, der von einem Exzenter einer Welle betätigt wird, erfolgt. Drei Radialkolben sind gleichmäßig am Außenumfang der Exzenterwelle verteilt. Jeder der Radialkolben liegt über einen Gleitschuh und einen Exzenterring auf der Exzenterwelle auf. Der Exzenterring ist über ein Gleitlager drehbar auf der Exzenterwelle gelagert. In DE 198 26 961 A1 ist eine Radialkolbenpumpe beschrieben, bei der eine Exzenterwelle zum Antreiben einer Fördereinheit einseitig im Pumpengehäuse ge- lagert ist und an dem frei auskragenden Endabschnitt der Welle eine als Gleitringdichtung ausgebildete Wellendichtung angeordnet ist. Der Gleitring liegt an einem Exzenterring der Exzenterwelle an, der durch eine Andruckeinrichtung und den Vordruck des Fördermittels gegen den gleitring gedrückt ist. Der Exzenter- ring ist kappenförmig ausgebildet und umgreift den frei auskragenden Endabschnitt der Exzenterwelle. From DE 43 05 791 A1 discloses a radial piston pump is known in which the fuel delivery via a radial piston which is actuated by an eccentric shaft, takes place. Three radial pistons are evenly distributed on the outer circumference of the eccentric shaft. Each of the radial pistons rests on the eccentric shaft via a sliding block and an eccentric ring. The eccentric ring is rotatably mounted on the eccentric shaft via a sliding bearing. DE 198 26 961 A1 describes a radial piston pump in which an eccentric shaft for driving a delivery unit is provided on one side in the pump housing. is superimposed and arranged on the freely projecting end portion of the shaft designed as a mechanical seal shaft seal. The slip ring is located on an eccentric of the eccentric shaft, which is pressed by a pressure device and the form of the conveyor against the sliding ring. The eccentric ring is cap-shaped and surrounds the freely projecting end portion of the eccentric shaft.
Die aus dem Stand der Technik bekannten Hochdruckpumpen sind jedoch konstruktiv sehr aufwändig und daher teuer in der Herstellung. However, the known from the prior art high-pressure pumps are structurally very complex and therefore expensive to manufacture.
Daher ist es erforderlich, konstruktiv vereinfachte bzw. einfach aufgebaute Kolbenpumpe, insbesondere eine Radialkolbenpumpe, zu schaffen, welche jedoch gleichzeitig eine hohe Hochdrehzahlfestigkeit aufweist. Offenbarung der Erfindung Therefore, it is necessary to provide a structurally simplified or simply constructed piston pump, in particular a radial piston pump, which, however, at the same time has a high high speed resistance. Disclosure of the invention
Vorteile der Erfindung Advantages of the invention
Erfindungsgemäß wird eine Hochdruckpumpe für eine Kraftstoffeinspritzeinrich- tung einer Brennkraftmaschine vorgesehen, welche ein Pumpenelement mit einem Pumpenkolben aufweist, welcher durch einen auf einer drehbar gelagerten Antriebswelle vorgesehenen Exzenter und einen den Exzenter umgebenden Exzenterring entsprechend einiem Exzenterhub auf und ab bewegbar ist, wobei der Pumpenkolben in einem Tassenstößel angeordnet ist. Mit der erfindungsgemä- ßen Hochdruckpumpe wird das Konzept einer als Einkolbenpumpe ausgeführtenAccording to the invention, a high-pressure pump is provided for a fuel injection device of an internal combustion engine which has a pump element with a pump piston which can be moved up and down in accordance with an eccentric stroke by an eccentric provided on a rotatably mounted drive shaft and an eccentric ring surrounding the eccentric a bucket tappet is arranged. The concept of a high-pressure pump according to the invention is designed as a single-piston pump
Hochdruckradialkolbenpumpe vereinfacht durch Vorsehen des Exzenterrings und des Tassenstößels bei sehr einfachem Aufbau übertragen. Die erfindungsgemäße Lösung bietet eine Kombination eines einfachen Aufbaus bei gleichzeitiger Hochdrehzahlfestigkeit. Durch Einsetzen des Pumpenkolbens in den Tassenstö- ßel kann er die auf ihn wirkenden Querkräfte besonders gut übertragen. Auch liegt der Hochdruck nur im Zylinderkopf an und das Gehäuse der Hochdruckpumpe trägt lediglich die Mechanik und den Niederdruckkreislauf. High-pressure radial piston pump simplified by providing the eccentric ring and the bucket tappet transmitted in a very simple structure. The solution according to the invention offers a combination of a simple construction with simultaneous high-speed stability. By inserting the pump piston into the cup tappet, it can transmit the lateral forces acting on it particularly well. Also, the high pressure is only in the cylinder head and the housing of the high pressure pump carries only the mechanics and the low pressure circuit.
Vorzugsweise ist der Tassenstößel ein Einfachtassenstößel. Der Einfachtassen- Stößel sieht eine noch weiter verbesserte Übertragung der auf den Pumpenkol- ben wirkenden Querkräfte vor und ist besonders bei hohen Drehzahlen zum Übertragen der Querkräfte auf das Gehäuse der Pumpe geeignet. Preferably, the bucket tappet is a single cup tappet. The single-cup tappet provides a further improved transmission of the ben acting transverse forces and is particularly suitable for high speeds for transmitting the shear forces on the housing of the pump.
Gemäß einer bevorzugten Ausführungsform ist die Hochdruckpumpe eine Ein- kolbenpumpe. According to a preferred embodiment, the high pressure pump is a single piston pump.
Gemäß noch einer weiteren Ausführungsform ist der Exzenter als Sinusnocken ausgeführt. Auch ist es bevorzugt, wenn zwischen dem Exzenter und dem Exzenterring einAccording to yet another embodiment, the eccentric is designed as a sinusoidal cam. It is also preferable if between the eccentric and the eccentric ring
Lager angeordnet ist. Bearing is arranged.
Besonders bevorzugt ist das Lager als PEEK-Lager ausgebildet. Durch Vorsehen des PEEK-Lagers werden hohe Drehzahlen ermöglicht. Darüber hinaus erlaubt die hohe Drehzahlfestigkeit der Hochdruckpumpe eine hohe Übersetzung und damit einen kleineren Kolbendurchmesser, was wiederum zu einem verbesserten Wirkungsgrad führt. Particularly preferably, the bearing is designed as a PEEK bearing. By providing the PEEK bearing high speeds are possible. In addition, the high speed resistance of the high pressure pump allows a high gear ratio and thus a smaller piston diameter, which in turn leads to improved efficiency.
Gemäß einer weiteren bevorzugten Ausführungsform ist der Tassenstößel in ei- ne in einem Gehäuse der Hochdruckpumpe gebildeter Aussparung eingesetzt. According to a further preferred embodiment, the tappet is inserted into a ne formed in a housing of the high-pressure pump recess.
Gemäß noch einer weiteren bevorzugten Ausführungsform weist der Tassenstößel eine Außenwand auf, welche an einer Wand des Gehäuses anliegt. In einer weiteren bevorzugten Ausführungsform weist der Tassenstößel eine Innenwand auf, welche einem Schaftabschnitt eines Zylinderkopfes gegenüberliegt, in welchem der Pumpenkolben angeordnet ist. According to yet another preferred embodiment, the bucket tappet on an outer wall, which rests against a wall of the housing. In a further preferred embodiment, the bucket tappet has an inner wall, which faces a shank portion of a cylinder head, in which the pump piston is arranged.
Vorzugsweise ist darüber hinaus zwischen der Innenwand des Tassenstößels und dem Schaftabschnitt eine Feder angeordnet. Preferably, moreover, a spring is arranged between the inner wall of the tappet and the shaft portion.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Im Nachfolgenden werden Ausführungsbeispiele der Erfindung unter Bezugnah- me auf die beigefügten Zeichnungen näher beschrieben. Es zeigt: - A - In the following, embodiments of the invention will be described in more detail with reference to the attached drawings. It shows: - A -
Fig. 1 eine teilweise Schnittansicht durch eine Hochdruckpumpe gemäß dem Stand der Technik; Fig. 1 is a partial sectional view through a high-pressure pump according to the prior art;
Fig. 2 einen Schnitt durch eine Hochdruckpumpe gemäß einer Ausführungsform. 2 shows a section through a high pressure pump according to one embodiment.
Ausführungsformen der Erfindung In Fig. 1 ist eine Hochdruckpumpe 1 für eine Kraftstoffeinspritzeinrichtung einerEmbodiments of the Invention In Fig. 1, a high pressure pump 1 for a fuel injector is a
Brennkraftmaschine gemäß dem Stand der Technik dargestellt. Die Hochdruckpumpe 1 gemäß dem Stand der Technik weist ein Gehäuse 2 auf, das mehrteilig ausgebildet ist, und in dem eine rotierend angetriebene Antriebswelle 3 angeordnet ist, auf welcher ein Nocken 4 vorgesehen ist. Die Hochdruckpumpe 1 weist ein in einem Zylinderkopf 5 angeordnetes Pumpenelement 6 mit einem Pumpenkolben 7 auf, der durch den Nocken 4 der Antriebswelle 3 mittelbar in einer Hubbewegung in zumindest annähernd radialer Richtung zur Drehachse D der Antriebswelle 3 angetrieben wird. Der Pumpenkolben 7 ist in einer Zylinderbohrung 8 im Zylinderkopf 5 dicht verschiebbar geführt und begrenzt mit seiner der An- triebswelle 3 abgewandten Stirnseite in der Zylinderbohrung 8 einen Pumpenarbeitsraum 9. An seinem dem Pumpenarbeitsraum 9 abgewandten Ende weist der Pumpenkolben 7 einen im Durchmesser gegenüber seinem übrigen Bereich vergrößerten Kolbenfuß 19 auf. Wie in der Figur erkannt werden kann, ist der Zylinderkopf 5 mit einem Schaftabschnitt 10 versehen, in welchem die den Pumpenkolben 7 aufnehmende Zylinderbohrung 8 vorgesehen ist, und um welchen herum die Feder 1 1 angeordnet ist. Der Pumpenarbeitsraum 9 weist über einen im Gehäuse 2 verlaufenden Kraftstoffzulaufkanal (nicht dargestellt) eine Verbindung mit einem Kraftstoffzulauf beispielsweise einer Förderpumpe auf. An der Mündung des Kraftstoffzulaufkanals in den Pumpenarbeitsraum 9 ist ein in den Pumpenarbeitsraum 9 öffnendes Einlassventil 12 angeordnet, das ein federbelastetes Ventilglied 13 aufweist. Der Pumpenarbeitsraum 9 weist außerdem über einen im Zylinderkopf 5 verlaufenden Kraftstoffablaufkanal 14 eine Verbindung mit einem Auslass auf, der bei- spielsweise mit einem Hochdruckspeicher (nicht dargestellt) eines Common Rail Systems verbunden ist. Mit dem Hochdruckspeicher sind ein oder vorzugsweise mehrere an den Zylindern der Brennkraftmaschine angeordnete Injektoren (nicht dargestellt) verbunden, durch die Kraftstoff in die Zylinder der Brennkraftmaschi- ne eingespritzt wird. An der Mündung des Kraftstoffablaufkanals 14 in den Pumpenarbeitsraum 9 ist ein aus dem Pumpenarbeitsraum 9 öffnendes Auslassventil 15 angeordnet. Internal combustion engine according to the prior art shown. The high pressure pump 1 according to the prior art comprises a housing 2, which is formed in several parts, and in which a rotationally driven drive shaft 3 is arranged, on which a cam 4 is provided. The high-pressure pump 1 has a pump element 6 arranged in a cylinder head 5 with a pump piston 7, which is indirectly driven by the cam 4 of the drive shaft 3 in a lifting movement in at least approximately radial direction to the rotation axis D of the drive shaft 3. The pump piston 7 is guided in a cylinder bore 8 in the cylinder head 5 tightly displaceable and limited with its drive shaft 3 facing away from end face in the cylinder bore 8 a pump working chamber 9. At its pump workspace 9 facing away from the end of the pump piston 7 has a diameter with respect to the rest Enlarged area piston 19. As can be seen in the figure, the cylinder head 5 is provided with a shaft portion 10 in which the cylinder bore 8 receiving the pump piston 7 is provided, and around which the spring 11 is disposed. The pump working chamber 9 has a connection (not shown) in the housing 2 via a fuel inlet channel to a connection with a fuel feed, for example, a feed pump. At the mouth of the fuel inlet channel into the pump working space 9 an opening into the pump working space 9 inlet valve 12 is arranged, which has a spring-loaded valve member 13. The pump working chamber 9 also has a connection extending in the cylinder head 5 fuel drain passage 14 with an outlet, which at- For example, with a high-pressure accumulator (not shown) of a common rail system is connected. One or preferably a plurality of injectors (not shown) arranged on the cylinders of the internal combustion engine are connected to the high-pressure accumulator, through which fuel is injected into the cylinders of the internal combustion engine. At the mouth of the fuel drain channel 14 into the pump working space 9, an outlet valve 15 opening out of the pump working space 9 is arranged.
Dem Pumpenelement 6 ist eine Stößelbaugruppe mit einem hohlzylindrischen Rollenstößel 16, einem Rollenschuh 17 und einer Laufrolle 18 zugeordnet, über die sich der Pumpenkolben 7 am Nocken 4 der Antriebswelle 3 abstützt. Die Stößelbaugruppe und der Pumpenkolben 7 werden durch die vorgespannte Feder 1 1 zum Nocken 4 der Antriebswelle 3 hin gedrückt. Die Feder 1 1 ist als den Pumpenkolben 7 umgebende Schraubendruckfeder ausgebildet. Die Feder 1 1 stützt sich einerseits an einer Gehäusewand des Zylinderkopfes 5 und andererseits an einem Federteller 20 ab. The pump element 6 is associated with a plunger assembly with a hollow cylindrical roller tappet 16, a roller shoe 17 and a roller 18, via which the pump piston 7 is supported on the cam 4 of the drive shaft 3. The plunger assembly and the pump piston 7 are pressed by the prestressed spring 1 1 to the cam 4 of the drive shaft 3 out. The spring 1 1 is designed as the pump piston 7 surrounding helical compression spring. The spring 1 1 is supported on the one hand on a housing wall of the cylinder head 5 and on the other hand on a spring plate 20 from.
Der Federteller 20 ist mit dem Pumpenkolben 7 verbunden, so dass die Feder 1 1 sowohl auf den Pumpenkolben 7 als auch auf den Rollenstößel 16 wirkt, um die- se gegen den Nocken 4 der Antriebswelle 3 zu drücken. Die beschriebene Hochdruckpumpe 1 gemäß dem Stand der Technik führt keinen Hochdruck innerhalb des Gehäuses 2, so dass keine Hochdruck- bzw. Festigkeitssteigernden Maßnahmen für das Gehäuse 2 erforderlich sind. Weiterhin ist in Fig. 1 erkennbar, dass die Hochdruckpumpe 1 eine Zumesseinheit 23 aufweist, und dass an dem Gehäuse 2 ein Anbauflansch 24 vorhanden ist. The spring plate 20 is connected to the pump piston 7, so that the spring 1 1 acts both on the pump piston 7 and on the roller tappet 16 in order to press it against the cam 4 of the drive shaft 3. The described high-pressure pump 1 according to the prior art does not produce high pressure within the housing 2, so that no high-pressure or strength-increasing measures for the housing 2 are required. Furthermore, it can be seen in FIG. 1 that the high-pressure pump 1 has a metering unit 23, and that a mounting flange 24 is provided on the housing 2.
Fig. 2 zeigt eine Schnittansicht durch eine Hochdruckpumpe 1 gemäß einer Aus- führungsform. Die Komponenten der Hochdruckpumpe 1 sind ebenfalls im Wesentlichen in einem mehrteiligen Gehäuse 2 und dem Zylinderkopf 5 angeordnet. Auf der Antriebswelle 3 ist ein Exzenter 21 angeordnet, welcher hier als Sinusnocken ausgebildet ist. Um den äußeren Umfang des Exzenters 21 herum ist ein Exzenterring 22 vorgesehen. Zwischen dem Exzenterring 22 und dem Exzenter 21 ist ein PEEK-Lager 30 vorgesehen, um die hohen Drehzahlen zu ermöglichen. In dem Zylinderkopf 5 ist ein Pumpenelement 6 mit einem Pumpenkolben 7, welcher an einem Ende in den Pumpenarbeitsraum 9 endet und an dem gegenüberliegenden Ende mit einem Kolbenfuß 20 versehen ist, angeordnet. Der Pumpen- kolben 7 ist in einem Tassenstößel 26 angeordnet, welcher als Einfachtassen- stößel ausgebildet ist, welcher gerade bei hohen Drehzahlen die Querkräfte auf das Gehäuse 2 überträgt. Die Querkräfte werden zusätzlich über einen durch das Bezugszeichen 29 gekennzeichneten Vorlauf reduziert. Der Tassenstößel 26 in eine in dem Gehäuse 2 der Hochdruckpumpe 1 gebildeten Aussparung 31 ein- gesetzt. Der Tassenstößel 26 weist eine Außenwand 27 auf, welche an einerFIG. 2 shows a sectional view through a high-pressure pump 1 according to an embodiment. The components of the high pressure pump 1 are also arranged substantially in a multi-part housing 2 and the cylinder head 5. On the drive shaft 3, an eccentric 21 is arranged, which is designed here as a sinusoidal cam. Around the outer periphery of the eccentric 21 around an eccentric ring 22 is provided. Between the eccentric ring 22 and the eccentric 21, a PEEK bearing 30 is provided to allow the high speeds. In the cylinder head 5 is a pump element 6 with a pump piston 7, which ends at one end in the pump working chamber 9 and is provided at the opposite end with a piston foot 20, respectively. The pump piston 7 is arranged in a bucket tappet 26, which is designed as a single-cup tappet, which transmits the transverse forces to the housing 2, especially at high rotational speeds. The lateral forces are additionally reduced by a flow indicated by the reference numeral 29. The tappet 26 is inserted into a recess 31 formed in the housing 2 of the high-pressure pump 1. The tappet 26 has an outer wall 27, which on a
Wand des Gehäuses 2 in der Aussparung 31 anliegt. Ferner weist der Tassenstößel 26 eine Innenwand 28 auf, welche dem Schaftabschnitt 10 des Zylinderkopfes 5 gegenüberliegt, in welchem der Pumpenkolben 7 angeordnet ist. Weiterhin ist in der Ausführungsform zwischen der Innenwand 28 des Tassenstößels 26 und dem Schaftabschnitt 10 ist eine Feder 1 1 angeordnet. Wall of the housing 2 rests in the recess 31. Furthermore, the cup tappet 26 has an inner wall 28, which is opposite to the shank portion 10 of the cylinder head 5, in which the pump piston 7 is arranged. Furthermore, in the embodiment between the inner wall 28 of the tappet 26 and the shaft portion 10, a spring 1 1 is arranged.
Darüber hinaus sind in dem Zylinderkopf 5 ein Einlassventil 12, über welches der Hochdruckpumpe 1 Kraftstoff zugeführt wird, und ein Auslassventil 15, über welches der mit Hochdruck beaufschlagte Kraftstoff an einen Hochdruckspeicher (nicht dargestellt) des Common RaN Systems weitergeleitet wird, angeordnet. In dem Gehäuse 2 ist in dieser Ausführungsform außerdem ein schematisch dargestelltes Kraftstoffüberlaufventil 25 vorgesehen. In addition, in the cylinder head 5, an inlet valve 12, via which the high-pressure pump 1 fuel is supplied, and an outlet valve 15, via which the high-pressure fuel to a high-pressure accumulator (not shown) of the common RaN system is forwarded arranged. In the housing 2, a schematically illustrated fuel overflow valve 25 is also provided in this embodiment.
Die Kraftübertragung zwischen der Antriebswelle 3 und dem Pumpenkolben 7 er- folgt über eine Laufrolle (nicht dargestellt), den auf dem Exzenter 21 gelagertenThe power transmission between the drive shaft 3 and the pump piston 7 takes place via a roller (not shown) mounted on the eccentric 21
Exzenterring 22 und den am Pumpenkolben 7 befestigten Kolbenfuß 20, wobei bei gemeinsamer Drehung der Antriebswelle 3, des Exzenters 21 und des Exzenterrings 22 um die Drehachse D der Antriebswelle 3 herum der Pumpenkolben 7 in eine Auf- und Ab-Bewegung versetzt wird bzw. abwechselnd einen Saughub und einen Druckhub entsprechend dem Exzenterhub ausführt. Eccentric ring 22 and attached to the pump piston 7 piston base 20, wherein with common rotation of the drive shaft 3, the eccentric 21 and the eccentric ring 22 about the rotation axis D of the drive shaft 3 around the pump piston 7 is set in an up and down movement or alternately performs a suction stroke and a pressure stroke corresponding to the Exzenterhub.
Wie bei der oben beschriebenen Hochdruckpumpe 1 gemäß dem Stand der Technik liegt der Hochdruck in der in Fig. 2 gezeigten Ausführungsform nur im Zylinderkopf 5 an, so dass das Gehäuse 2 nur die Mechanik und den Nieder- druckkreislauf trägt. Die erfindungsgemäße Hochdruckpumpe 1 bietet eine besonders vorteilhafte Kombination einer einfachen Konstruktion bei gleichzeitiger Hochdrehzahlfestigkeit, wobei die hohe Drehzahlfestigkeit wiederum eine hohe Übersetzung und damit einen kleineren Kolbendurchmesser erlaubt, was wiederum zu einer Verbesserung des Wirkungsgrads der Hochdruckpumpe 1 führt. As in the above-described high-pressure pump 1 according to the prior art, the high pressure in the embodiment shown in Fig. 2 is applied only in the cylinder head 5, so that the housing 2 carries only the mechanics and the low-pressure circuit. The high-pressure pump 1 according to the invention offers a particularly advantageous combination of a simple design with simultaneous high rotational speed, the high rotational speed in turn allows a high translation and thus a smaller piston diameter, which in turn leads to an improvement in the efficiency of the high-pressure pump 1.

Claims

Ansprüche claims
1 . Hochdruckpumpe (1 ) für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine, welche ein Pumpenelement (6) mit einem Pumpenkolben (7) aufweist, welcher durch einen auf einer drehbar gelagerten Antriebswelle (3) vorgesehenen Exzenter (21 ) und einen den Exzenter (21 ) umgebenden Ex- zenterring (22) entsprechend einem Exzenterhub auf und ab bewegbar ist, dadurch gekennzeichnet, dass 1 . High-pressure pump (1) for a fuel injection device of an internal combustion engine, which has a pump element (6) with a pump piston (7) which is provided by an eccentric (21) provided on a rotatably mounted drive shaft (3) and an eccentric (21) surrounding the eccentric (21). Centering ring (22) is movable up and down according to a Exzenterhub, characterized in that
der Pumpenkolben (7) in einem Tassenstößel (26) angeordnet ist.  the pump piston (7) is arranged in a cup tappet (26).
2. Hochdruckpumpe (1 ) nach Anspruch 1 , 2. High-pressure pump (1) according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
der Tassenstößel (26) ein Einfachtassenstößel ist.  the bucket tappet (26) is a single cup tappet.
3. Hochdruckpumpe (1 ) nach Anspruch 1 oder 2, 3. High-pressure pump (1) according to claim 1 or 2,
dadurch gekennzeichnet, dass  characterized in that
die Hochdruckpumpe (1 ) eine Einkolbenpumpe ist.  the high pressure pump (1) is a single piston pump.
4. Hochdruckpumpe (1 ) nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass 4. High-pressure pump (1) according to one or more of claims 1 to 3, characterized in that
der Exzenter (21 ) als Sinusnocken ausgeführt ist.  the eccentric (21) is designed as a sinusoidal cam.
5. Hochdruckpumpe (1 ) nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass 5. High-pressure pump (1) according to one or more of claims 1 to 4, characterized in that
zwischen dem Exzenter (21 ) und dem Exzenterring (22) ein Lager angeordnet ist.  between the eccentric (21) and the eccentric ring (22) is arranged a bearing.
6. Hochdruckpumpe (1 ) nach Anspruch 5, 6. High-pressure pump (1) according to claim 5,
dadurch gekennzeichnet, dass  characterized in that
das Lager ein PEEK-Lager (30) ist.  the bearing is a PEEK bearing (30).
7. Hochdruckpumpe (1 ) nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Tassenstößel (26) in eine in einem Gehäuse (2) der Hochdruckpumpe (1 ) gebildeten Aussparung (31 ) eingesetzt ist. 7. High-pressure pump (1) according to one or more of claims 1 to 6, characterized in that the cup tappet (26) is inserted into a recess (31) formed in a housing (2) of the high-pressure pump (1).
8. Hochdruckpumpe (1 ) nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass 8. High-pressure pump (1) according to one or more of claims 1 to 7, characterized in that
der Tassenstößel (26) eine Außenwand (27) aufweist, welche an einer Wand des Gehäuses (2) anliegt.  the cup tappet (26) has an outer wall (27) which bears against a wall of the housing (2).
9. Hochdruckpumpe (1 ) nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass 9. High-pressure pump (1) according to one or more of claims 1 to 8, characterized in that
der Tassenstößel (26) eine Innenwand (28) aufweist, welche einem Schaftabschnitt (10) eines Zylinderkopfes (5) gegenüberliegt, in welchem der Pumpenkolben (7) angeordnet ist.  the cup tappet (26) has an inner wall (28) which faces a shank portion (10) of a cylinder head (5) in which the pump piston (7) is arranged.
10. Hochdruckpumpe (1 ) nach Anspruch 9, 10. High-pressure pump (1) according to claim 9,
dadurch gekennzeichnet, dass  characterized in that
zwischen der Innenwand (28) des Tassenstößels (26) und dem Schaftabschnitt (10) eine Feder (1 1 ) angeordnet ist.  between the inner wall (28) of the tappet (26) and the shaft portion (10) is arranged a spring (1 1).
EP10718148A 2009-06-29 2010-04-30 High pressure pump Withdrawn EP2449261A1 (en)

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DE200910027272 DE102009027272A1 (en) 2009-06-29 2009-06-29 high pressure pump
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CN102425533A (en) * 2011-09-23 2012-04-25 重庆工商大学 Sinusoidal flow generating device
CN103047100A (en) * 2013-01-10 2013-04-17 无锡开普机械有限公司 Rotor pump with cam shaft sleeve
CN103452789A (en) * 2013-09-06 2013-12-18 中国第一汽车股份有限公司无锡油泵油嘴研究所 Cam mechanism for oil supply pump of internal combustion engine
CN103470416B (en) * 2013-09-26 2016-08-17 南岳电控（衡阳）工业技术股份有限公司 A kind of radial plunger oil feed pump being applied to high pressure common rail fuel injection system
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