EP2255089A1 - Fuel pump - Google Patents

Fuel pump

Info

Publication number
EP2255089A1
EP2255089A1 EP09723427A EP09723427A EP2255089A1 EP 2255089 A1 EP2255089 A1 EP 2255089A1 EP 09723427 A EP09723427 A EP 09723427A EP 09723427 A EP09723427 A EP 09723427A EP 2255089 A1 EP2255089 A1 EP 2255089A1
Authority
EP
European Patent Office
Prior art keywords
pump
shaft
fuel
pump part
housing
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.)
Granted
Application number
EP09723427A
Other languages
German (de)
French (fr)
Other versions
EP2255089B1 (en
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 EP2255089A1 publication Critical patent/EP2255089A1/en
Application granted granted Critical
Publication of EP2255089B1 publication Critical patent/EP2255089B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the invention relates to a fuel pump, in particular a pump arrangement with an external gear pump. Specifically, the invention relates to the field of fuel injection systems of air compressing, self-igniting internal combustion engines.
  • the known pump arrangement is particularly suitable for a common rail injection system.
  • the known pump arrangement comprises a radial piston pump with a drive shaft mounted in a pump housing and a low pressure pump upstream of the radial piston pump.
  • leakage occurs in the region of the drive train from the gear pump into the interior of the radial piston pump.
  • the known from DE 197 36 160 Al pump arrangement has the disadvantage that a housing cover for the low pressure pump is required, which must be connected to the housing of the radial piston pump so that a reliable sealing effect is given.
  • the structure of the known pump arrangement is therefore relatively complicated.
  • the fuel pump according to the invention with the features of claim 1 has the advantage that the structure of the fuel pump is simplified. Specifically, the Sealing of the first pump part can be simplified with the gear pump.
  • the second pump part is configured as a high-pressure pump part, that the second pump part has a high-pressure pump housing and that the high-pressure pump housing comprises the housing part which separates the first pump part from the second pump part.
  • the high-pressure pump part may have a radial piston pump, which is connected upstream of the gear pump of the first pump part.
  • the first pump part can be attached in a relatively simple manner to the second pump part, for example, one or more pins or the like may be provided by means of which the first pump part is centered to the high-pressure pump housing of the second pump part. The requirements for the tightness are reduced, with a cover of the first pump part can be omitted.
  • the first pump part may, for example, be surrounded by a relatively simply designed housing part, which is connected to the high-pressure pump housing.
  • the shaft sealing ring lies on its outer side on an inner surface of the opening, which is provided in the housing part separating the two pump parts.
  • the inner surface of the opening is preferably designed as a cylinder jacket, so that it has a uniform curvature in the circumferential direction and a flat, in particular full-surface, concern of the shaft seal on the cylinder jacket-shaped inner surface of the opening is possible. As a result, a high sealing effect is achieved in the region between the inner surface of the opening and the outer side of the shaft sealing ring.
  • the shaft sealing ring has on its inside an at least substantially circular sealing edge and that the shaft seal rests with its circular sealing edge on the pump shaft.
  • a reliable seal in the region between the inside of the shaft sealing ring and the pump shaft is achieved even at relatively high speeds of the pump shaft.
  • a clamping element is provided which presses the circular sealing edge of the shaft sealing ring circumferentially against the pump shaft. The clamping element thereby biases the shaft sealing ring with respect to the pump shaft, so that a high contact pressure in the radial direction is achieved on the pump shaft, which allows a high sealing effect.
  • the clamping element can, for example, as a clamping ring be configured, which is elastically expanded in the shaft seal integrated.
  • the clamping ring can be formed for example from a metal ring.
  • the first pump part may also have other elements in addition to one or more gears.
  • the first pump part may have a coupling, wherein the gear is operatively connected by means of the coupling with the pump shaft.
  • the design of the pump shaft is adapted to the particular application.
  • the pump shaft may be designed as a polygonal shaft or as a camshaft.
  • Fig. 1 is a side view of a fuel pump according to a
  • Fig. 2 is a partial section through the fuel pump shown in Fig. 1 along the section line designated by Il.
  • Fig. 1 shows a fuel pump 1 in a side view according to a first embodiment of the invention.
  • the fuel pump 1 can be designed in particular as a pump arrangement with an external gear pump for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel pump 1 is for a fuel injection system with a fuel rail, a so-called common rail that stores diesel fuel under high pressure.
  • the fuel pump 1 according to the invention is also suitable for other applications.
  • the fuel pump 1 has a first pump part 2 and a second pump part 3.
  • the second pump portion lies behind the first pump part 2 and is partially covered by the first pump part 2.
  • an intake manifold 4 is provided, via the fuel from a Tank or the like can be supplied.
  • the fuel first passes through the second pump part 3 to a gear pump provided in the first pump part 2, which is connected upstream of a high-pressure pump provided in the second pump part 3.
  • the first pump part 2 therefore has the function of a low-pressure pump
  • the second pump part 3 mainly has the function of a high-pressure pump.
  • the high-pressure pump of the second pump part 3 can be designed in particular as a radial piston pump.
  • the first pump part 2 has gears 5, 6, the position of which is illustrated in FIG. 1 by broken lines.
  • the gears 5, 6 are covered by a cover 7, which is connected to fixed points 8A, 8B, 8C, 8D with a high-pressure pump housing 9 of the second pump part 3.
  • the cover 7 preferably has essentially the function to cover the gears 5, 6 and possibly other components of the first pump part 2.
  • the cover 7 has no special sealing means and is also provided with respect to the attachment to the high-pressure pump housing 9 with no special seal.
  • the cover 7 is in particular not designed as a lid. Thus, the cover 7 can be easily manufactured.
  • the first pump part 2 is thus designed without cover and thus also inexpensive to manufacture.
  • Fig. 1 the position of a pump shaft 15 is also shown, which is illustrated by a broken line.
  • FIG. 2 shows a partial section through the fuel pump 1 shown in FIG. 1 along the section line designated by II.
  • the cover 7 is connected to the fixing point 8 B with a housing part 16 of the high-pressure pump housing 9 of the second pump part 3.
  • the connection can be made for example by means of a screw.
  • the housing part 16 is in this embodiment part of the second pump part 3.
  • the housing part 16 separates the first pump part 2 of the second pump part 3. In this case, the housing part 16 is disposed substantially between the pump parts 2, 3 of the fuel pump 1.
  • a bearing pin 17 is formed, which has a bearing surface 18.
  • a gear 19 is mounted, which is in engagement with a further gear 20 to form a gear pump.
  • the pump shaft 15 of the fuel pump 1 is inside the second pump part 3 stored and aligned axially with the gear 19.
  • the pump shaft 15 is driven so that it rotates about an axis 21.
  • the pump shaft 15 protrudes through an opening 22 in the housing part 16.
  • the pump shaft 15 protrudes partially into an adjacent to the housing part 16, bounded by the cover 7 space 23 of the first pump part 2.
  • a clutch 24 is also arranged.
  • An example designed as a two-flat end 25 of the pump shaft 15 is connected in a suitable manner with the coupling 24, so that via the coupling 24 is an operative connection between the pump shaft 15 and the gear 19.
  • the end 25 of the pump shaft 15 is at least substantially in the space 23 of the first pump part. 2
  • an at least substantially cylindrical jacket-shaped inner surface 30 of the opening 22 is formed on the housing part 16.
  • the axis 21 of the pump shaft 15 is oriented at least substantially centrally to the cylinder jacket-shaped inner surface 30.
  • a shaft sealing ring 31 is arranged, which, viewed in the circumferential direction, has a profile opened on one side. In this embodiment, the profile is open to the second pump part 3.
  • the shaft sealing ring 31 is configured such that an outer surface 32 of the shaft sealing ring 31, which is at least substantially cylindrical, is formed. The shaft sealing ring 31 rests flat on this outer surface 32 against the cylinder jacket-shaped inner surface 30 of the opening 22, so that a reliable sealing effect is provided in the region between the outer surface 32 of the shaft sealing ring 31 and the inner surface 30 of the opening 22.
  • the sealing ring has in profile a directed toward the pump shaft 15, triangular inner piece 33.
  • the inner piece 33 of the shaft sealing ring 31 is designed such that a circular sealing edge 34 is provided on the shaft sealing ring 31, at which there is a contact between the shaft sealing ring 31 and the pump shaft 15.
  • the shaft sealing ring 31 abuts circumferentially on the pump shaft 15 at the circular sealing edge 34.
  • the shaft sealing ring 31 has a tensioning element designed as a clamping ring 35, which is inserted into the shaft sealing ring 31 which is open on one side in the profile.
  • the clamping element 35 may be formed, for example, of a metal ring.
  • the clamping element 35 is resiliently biased when introduced into the shaft sealing ring 31, wherein in the mounted state, which is shown in FIG. 2, a certain bias of the clamping element 35 of the shaft seal 31 continues.
  • the sealing edge 34 is pressed against the pump shaft 15 on the inner piece 33 of the shaft sealing ring 31 by the bias of the clamping element 35. This results in a reliable seal between the shaft seal 31 and the pump shaft 15 in the region of the sealing edge 34th
  • the shaft seal 31 generates both in the region of its outer surface 32 to the housing part 16 out as well as in the region of its sealing edge 34 to the pump shaft 15 toward a reliable sealing effect.
  • the shaft seal 31 therefore seals the second pump part 3 reliably relative to the first pump part 2.
  • no or at most a slight leakage occurs from the second pump part 3 in the space 23 of the first pump part 2.
  • This makes it possible for the first pump part 2 to be designed without seals, specifically that the first pump part 2 is designed to be cap-free. Therefore, a cover of the first pump part 2 with the cover 7 is sufficient.
  • the pump shaft 15 may be configured as a polygonal shaft or as a camshaft.
  • the fuel pump 1 of the embodiment of the invention has the advantage that the shaft seal 31 is integrated in the opening 22 of the housing part 16.
  • the shaft seal 31 may be formed substantially of an elastic material, for example, an elastic plastic, wherein the clamping element 35 of the shaft seal 31 is preferably formed of a metallic material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A fuel pump (1) for a fuel injection system of air-compressing, self-igniting internal combustion engines comprises a first pump part (2) encompassing a gear pump, and a second pump part (3). The first pump part (2) is separated from the second pump part (3) by means of a housing part (16). A pump shaft (15) extends into the housing part (16) through an opening (22). A shaft sealing ring (31) which seals the first pump part (2) relative to the second pump part (3) is arranged in the opening (22). It is thus sufficient for the first pump part (2) to be covered by a cover (7) such that the first pump part (2) does not require a lid.

Description

Beschreibung description
Titel BrennstoffpumpeTitle fuel pump
Stand der TechnikState of the art
Die Erfindung betrifft eine Brennstoffpumpe, insbesondere eine Pumpenanordnung mit einer Außenzahnradpumpe. Speziell betrifft die Erfindung das Gebiet der Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen.The invention relates to a fuel pump, in particular a pump arrangement with an external gear pump. Specifically, the invention relates to the field of fuel injection systems of air compressing, self-igniting internal combustion engines.
Aus der DE 197 36 160 Al ist eine Pumpenanordnung zur Brennstoffhochdruckversorgung bei Brennstoffeinspritzsystemen von Brennkraftmaschinen bekannt. Die bekannte Pumpenanordnung eignet sich besonders für ein Common-Rail-Einspritzsystem. Die bekannte Pumpenanordnung weist eine Radialkolbenpumpe mit einer in einem Pumpengehäuse gelagerten Antriebswelle und eine der Radialkolbenpumpe vorgeschaltete Niederdruckpumpe auf. Die Abdichtung zwischen der als Zahnradpumpe ausgestalteten Niederdruckpumpe und der Radialkolbenpumpe nach außen erfolgt über Dichtringe, wobei im Bereich des Antriebstrangs zwischen der Zahnradpumpe der Radialkolbenpumpe keine zusätzliche Abdichtung vorgesehen ist, da die interne Schmierung der Radialkolbenpumpe über das geförderte Medium Brennstoff erfolgt. Dadurch erfolgt eine Leckage im Bereich des Antriebsstrangs aus der Zahnradpumpe in das Innere der Radialkolbenpumpe.From DE 197 36 160 Al a pump arrangement for high-pressure fuel supply in fuel injection systems of internal combustion engines is known. The known pump arrangement is particularly suitable for a common rail injection system. The known pump arrangement comprises a radial piston pump with a drive shaft mounted in a pump housing and a low pressure pump upstream of the radial piston pump. The sealing between the designed as a gear pump low-pressure pump and the radial piston pump to the outside via sealing rings, wherein no additional seal is provided in the region of the drive train between the gear pump of the radial piston pump, since the internal lubrication of the radial piston pump via the conveyed medium fuel. As a result, leakage occurs in the region of the drive train from the gear pump into the interior of the radial piston pump.
Die aus der DE 197 36 160 Al bekannte Pumpenanordnung hat den Nachteil, dass ein Gehäusedeckel für die Niederdruckpumpe erforderlich ist, der so mit dem Gehäuse der Radialkolbenpumpe verbunden sein muss, dass eine zuverlässige Dichtwirkung gegeben ist. Der Aufbau der bekannten Pumpenanordnung ist daher relativ aufwändig.The known from DE 197 36 160 Al pump arrangement has the disadvantage that a housing cover for the low pressure pump is required, which must be connected to the housing of the radial piston pump so that a reliable sealing effect is given. The structure of the known pump arrangement is therefore relatively complicated.
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Brennstoffpumpe mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass der Aufbau der Brennstoffpumpe vereinfacht ist. Speziell kann die Abdichtung des ersten Pumpenteils mit der Zahnradpumpe vereinfacht werden.The fuel pump according to the invention with the features of claim 1 has the advantage that the structure of the fuel pump is simplified. Specifically, the Sealing of the first pump part can be simplified with the gear pump.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der im Anspruch 1 angegebenen Brennstoffpumpe möglich.The measures listed in the dependent claims advantageous developments of the fuel pump specified in claim 1 are possible.
Vorteilhaft ist es, dass der zweite Pumpenteil als Hochdruckpumpenteil ausgestaltet ist, dass der zweite Pumpenteil ein Hochdruckpumpengehäuse aufweist und dass das Hochdruckpumpengehäuse den Gehäuseteil, der den ersten Pumpenteil von dem zweiten Pumpenteil trennt, umfasst. Dabei kann der Hochdruck-Pumpenteil eine Radialkolbenpumpe aufweisen, der der Zahnradpumpe des ersten Pumpenteils vorgeschaltet ist. Der erste Pumpenteil kann dabei auf relativ einfache Weise an dem zweiten Pumpenteil angebracht werden, beispielsweise können ein oder mehrere Stifte oder dergleichen vorgesehen sein, mittels der der erste Pumpenteil zum Hochdruck- Pumpengehäuse des zweiten Pumpenteils zentriert wird. Dabei sind die Anforderungen an die Dichtheit reduziert, wobei ein Deckel des ersten Pumpenteils entfallen kann. Der erste Pumpenteil kann beispielsweise mit einem relativ einfach ausgestalteten Gehäuseteil umgeben sein, das mit dem Hochdruck-Pumpengehäuse verbunden wird.It is advantageous that the second pump part is configured as a high-pressure pump part, that the second pump part has a high-pressure pump housing and that the high-pressure pump housing comprises the housing part which separates the first pump part from the second pump part. In this case, the high-pressure pump part may have a radial piston pump, which is connected upstream of the gear pump of the first pump part. The first pump part can be attached in a relatively simple manner to the second pump part, for example, one or more pins or the like may be provided by means of which the first pump part is centered to the high-pressure pump housing of the second pump part. The requirements for the tightness are reduced, with a cover of the first pump part can be omitted. The first pump part may, for example, be surrounded by a relatively simply designed housing part, which is connected to the high-pressure pump housing.
In vorteilhafter Weise liegt der Wellendichtring an seiner Außenseite an einer Innenfläche der Öffnung, die in dem die beiden Pumpenteile voneinander trennenden Gehäuseteil vorgesehen ist, an. Die Innenfläche der Öffnung ist dabei vorzugsweise zylindermantelförmig ausgebildet, so dass diese in Umfangsrichtung eine gleichmäßige Krümmung aufweist und ein flächiges, insbesondere vollflächiges, Anliegen des Wellendichtrings an der zylindermantelförmigen Innenfläche der Öffnung ermöglicht ist. Dadurch wird eine hohe Dichtwirkung im Bereich zwischen der Innenfläche der Öffnung und der Außenseite des Wellendichtrings erzielt.Advantageously, the shaft sealing ring lies on its outer side on an inner surface of the opening, which is provided in the housing part separating the two pump parts. The inner surface of the opening is preferably designed as a cylinder jacket, so that it has a uniform curvature in the circumferential direction and a flat, in particular full-surface, concern of the shaft seal on the cylinder jacket-shaped inner surface of the opening is possible. As a result, a high sealing effect is achieved in the region between the inner surface of the opening and the outer side of the shaft sealing ring.
Ferner ist es vorteilhaft, dass der Wellendichtring an seiner Innenseite eine zumindest im Wesentlichen kreislinienförmige Dichtkante aufweist und dass der Wellendichtring mit seiner kreislinienförmigen Dichtkante an der Pumpenwelle anliegt. Dadurch wird auch bei relativ hohen Drehzahlen der Pumpenwelle eine zuverlässige Abdichtung im Bereich zwischen der Innenseite des Wellendichtrings und der Pumpenwelle erzielt. Dabei ist es außerdem von Vorteil, dass ein Spannelement vorgesehen ist, das die kreislinienförmige Dichtkante des Wellendichtrings umfänglich gegen die Pumpenwelle presst. Das Spannelement spannt dadurch den Wellendichtring in Bezug auf die Pumpenwelle, so dass eine hohe Anpresskraft in radialer Richtung an die Pumpenwelle erzielt wird, die eine hohe Dichtwirkung ermöglicht. Das Spannelement kann beispielsweise als Spannring ausgestaltet sein, der elastisch aufgeweitet in den Wellendichtring integriert ist. Der Spannring kann beispielsweise aus einem Metallring gebildet sein.Furthermore, it is advantageous that the shaft sealing ring has on its inside an at least substantially circular sealing edge and that the shaft seal rests with its circular sealing edge on the pump shaft. As a result, a reliable seal in the region between the inside of the shaft sealing ring and the pump shaft is achieved even at relatively high speeds of the pump shaft. It is also advantageous that a clamping element is provided which presses the circular sealing edge of the shaft sealing ring circumferentially against the pump shaft. The clamping element thereby biases the shaft sealing ring with respect to the pump shaft, so that a high contact pressure in the radial direction is achieved on the pump shaft, which allows a high sealing effect. The clamping element can, for example, as a clamping ring be configured, which is elastically expanded in the shaft seal integrated. The clamping ring can be formed for example from a metal ring.
Der erste Pumpenteil kann neben einem oder mehreren Zahnrädern auch weitere Elemente aufweisen. Beispielsweise kann der erste Pumpenteil eine Kupplung aufweisen, wobei das Zahnrad mittels der Kupplung mit der Pumpenwelle in Wirkverbindung steht. Die Ausgestaltung der Pumpenwelle ist an den jeweiligen Anwendungsfall angepasst. Beispielsweise kann die Pumpenwelle als Polygonwelle oder als Nockenwelle ausgestaltet sein.The first pump part may also have other elements in addition to one or more gears. For example, the first pump part may have a coupling, wherein the gear is operatively connected by means of the coupling with the pump shaft. The design of the pump shaft is adapted to the particular application. For example, the pump shaft may be designed as a polygonal shaft or as a camshaft.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Bevorzugte Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung anhand der beigefügten Zeichnungen, in denen sich entsprechende Elemente mit übereinstimmenden Bezugszeichen versehen sind, näher erläutert. Es zeigt:Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. It shows:
Fig. 1 eine Seitenansicht einer Brennstoffpumpe entsprechend einemFig. 1 is a side view of a fuel pump according to a
Ausführungsbeispiel der Erfindung undEmbodiment of the invention and
Fig. 2 einen auszugsweisen Schnitt durch die in Fig. 1 gezeigte Brennstoffpumpe entlang der mit Il bezeichneten Schnittlinie.Fig. 2 is a partial section through the fuel pump shown in Fig. 1 along the section line designated by Il.
Ausführungsformen der ErfindungEmbodiments of the invention
Fig. 1 zeigt eine Brennstoffpumpe 1 in einer seitlichen Ansicht entsprechend einem ersten Ausführungsbeispiel der Erfindung. Die Brennstoffpumpe 1 kann insbesondere als Pumpenanordnung mit einer Außenzahnradpumpe für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen ausgestaltet sein. Ein bevorzugter Einsatz der Brennstoffpumpe 1 besteht für eine Brennstoffeinspritzanlage mit einer Brennstoffverteilerleiste, einem sogenannten Common-Rail, das Dieselbrennstoff unter hohem Druck speichert. Die erfindungsgemäße Brennstoffpumpe 1 eignet sich jedoch auch für andere Anwendungsfälle.Fig. 1 shows a fuel pump 1 in a side view according to a first embodiment of the invention. The fuel pump 1 can be designed in particular as a pump arrangement with an external gear pump for fuel injection systems of air-compressing, self-igniting internal combustion engines. A preferred use of the fuel pump 1 is for a fuel injection system with a fuel rail, a so-called common rail that stores diesel fuel under high pressure. However, the fuel pump 1 according to the invention is also suitable for other applications.
Die Brennstoffpumpe 1 weist einen ersten Pumpenteil 2 und einen zweiten Pumpenteil 3 auf. Dabei liegt in der dargestellten Seitenansicht der zweite Pumpenanteil hinter dem ersten Pumpenteil 2 und ist teilweise von dem ersten Pumpenteil 2 verdeckt. An dem zweiten Pumpenteil 3 ist ein Ansaugstutzen 4 vorgesehen, über den Brennstoff aus einem Tank oder dergleichen zugeführt werden kann. Von dem Ansaugstutzen 4 gelangt der Brennstoff durch das zweite Pumpenteil 3 zunächst zu einer in dem ersten Pumpenteil 2 vorgesehenen Zahnradpumpe, die einer in dem zweiten Pumpenteil 3 vorgesehenen Hochdruckpumpe vorgeschaltet ist. Das erste Pumpenteil 2 hat deshalb die Funktion einer Niederdruckpumpe, während das zweite Pumpenteil 3 hauptsächlich die Funktion einer Hochdruckpumpe hat. Die Hochdruckpumpe des zweiten Pumpenteils 3 kann insbesondere als Radialkolbenpumpe ausgestaltet sein.The fuel pump 1 has a first pump part 2 and a second pump part 3. In the illustrated side view, the second pump portion lies behind the first pump part 2 and is partially covered by the first pump part 2. At the second pump part 3, an intake manifold 4 is provided, via the fuel from a Tank or the like can be supplied. From the intake manifold 4, the fuel first passes through the second pump part 3 to a gear pump provided in the first pump part 2, which is connected upstream of a high-pressure pump provided in the second pump part 3. The first pump part 2 therefore has the function of a low-pressure pump, while the second pump part 3 mainly has the function of a high-pressure pump. The high-pressure pump of the second pump part 3 can be designed in particular as a radial piston pump.
Der erste Pumpenteil 2 weist Zahnräder 5, 6 auf, deren Position in der Fig. 1 durch unterbrochen dargestellte Linien veranschaulicht ist. Dabei sind die Zahnräder 5, 6 von einer Abdeckung 7 abgedeckt, die an Fixpunkten 8A, 8B, 8C, 8D mit einem Hochdruckpumpengehäuse 9 des zweiten Pumpenteils 3 verbunden ist. Die Abdeckung 7 hat vorzugsweise im Wesentlichen die Funktion, die Zahnräder 5, 6 und gegebenenfalls weitere Komponenten des ersten Pumpenteils 2 abzudecken. Die Abdeckung 7 weist allerdings keine besonderen Dichtmittel auf und ist auch in Bezug auf die Befestigung an dem Hochdruckpumpengehäuse 9 mit keiner besonderen Dichtung versehen. Die Abdeckung 7 ist insbesondere nicht als Deckel ausgestaltet. Somit kann die Abdeckung 7 einfach hergestellt werden. Das erste Pumpenteil 2 ist somit deckellos ausgeführt und somit ebenfalls kostengünstig herzustellen.The first pump part 2 has gears 5, 6, the position of which is illustrated in FIG. 1 by broken lines. The gears 5, 6 are covered by a cover 7, which is connected to fixed points 8A, 8B, 8C, 8D with a high-pressure pump housing 9 of the second pump part 3. The cover 7 preferably has essentially the function to cover the gears 5, 6 and possibly other components of the first pump part 2. However, the cover 7 has no special sealing means and is also provided with respect to the attachment to the high-pressure pump housing 9 with no special seal. The cover 7 is in particular not designed as a lid. Thus, the cover 7 can be easily manufactured. The first pump part 2 is thus designed without cover and thus also inexpensive to manufacture.
In der Fig. 1 ist außerdem die Position einer Pumpenwelle 15 dargestellt, die durch eine unterbrochen gezeichnete Linie veranschaulicht ist.In Fig. 1, the position of a pump shaft 15 is also shown, which is illustrated by a broken line.
Fig. 2 zeigt einen auszugsweisen Schnitt durch die in Fig. 1 dargestellte Brennstoffpumpe 1 entlang der mit Il bezeichneten Schnittlinie. Die Abdeckung 7 ist an dem Fixierpunkt 8B mit einem Gehäuseteil 16 des Hochdruckpumpengehäuses 9 des zweiten Pumpenteils 3 verbunden. Die Verbindung kann beispielsweise mittels einer Schraube erfolgen. Das Gehäuseteil 16 ist in diesem Ausführungsbeispiel Bestandteil des zweiten Pumpenteils 3. Das Gehäuseteil 16 trennt den ersten Pumpenteil 2 von dem zweiten Pumpenteil 3. Dabei ist das Gehäuseteil 16 im Wesentlichen zwischen den Pumpenteilen 2, 3 der Brennstoffpumpe 1 angeordnet.FIG. 2 shows a partial section through the fuel pump 1 shown in FIG. 1 along the section line designated by II. The cover 7 is connected to the fixing point 8 B with a housing part 16 of the high-pressure pump housing 9 of the second pump part 3. The connection can be made for example by means of a screw. The housing part 16 is in this embodiment part of the second pump part 3. The housing part 16 separates the first pump part 2 of the second pump part 3. In this case, the housing part 16 is disposed substantially between the pump parts 2, 3 of the fuel pump 1.
An der Abdeckung 7 ist ein Lagerzapfen 17 ausgebildet, der eine Lagerfläche 18 aufweist. An der Lagerfläche 18 ist ein Zahnrad 19 gelagert, das mit einem weiteren Zahnrad 20 im Eingriff steht, um eine Zahnradpumpe zu bilden.On the cover 7, a bearing pin 17 is formed, which has a bearing surface 18. On the bearing surface 18, a gear 19 is mounted, which is in engagement with a further gear 20 to form a gear pump.
Die Pumpenwelle 15 der Brennstoffpumpe 1 ist innerhalb des zweiten Pumpenteils 3 gelagert und axial zu dem Zahnrad 19 ausgerichtet. Im Betrieb der Brennstoffpumpe 1 wird die Pumpenwelle 15 angetrieben, so dass diese um eine Achse 21 rotiert. Die Pumpenwelle 15 ragt durch eine Öffnung 22 in den Gehäuseteil 16. Dabei ragt die Pumpenwelle 15 teilweise in einen an das Gehäuseteil 16 angrenzenden, von der Abdeckung 7 begrenzten Raum 23 des ersten Pumpenteils 2. In dem Raum 23 ist außerdem eine Kupplung 24 angeordnet. Ein beispielsweise als Zweiflach ausgestaltetes Ende 25 der Pumpenwelle 15 ist auf geeignete Weise mit der Kupplung 24 verbunden, so dass über die Kupplung 24 eine Wirkverbindung zwischen der Pumpenwelle 15 und dem Zahnrad 19 besteht. Das Ende 25 der Pumpenwelle 15 befindet sich zumindest im Wesentlichen in dem Raum 23 des ersten Pumpenteils 2.The pump shaft 15 of the fuel pump 1 is inside the second pump part 3 stored and aligned axially with the gear 19. During operation of the fuel pump 1, the pump shaft 15 is driven so that it rotates about an axis 21. The pump shaft 15 protrudes through an opening 22 in the housing part 16. In this case, the pump shaft 15 protrudes partially into an adjacent to the housing part 16, bounded by the cover 7 space 23 of the first pump part 2. In the space 23, a clutch 24 is also arranged. An example designed as a two-flat end 25 of the pump shaft 15 is connected in a suitable manner with the coupling 24, so that via the coupling 24 is an operative connection between the pump shaft 15 and the gear 19. The end 25 of the pump shaft 15 is at least substantially in the space 23 of the first pump part. 2
An dem Gehäuseteil 16 ist eine zumindest im Wesentlichen zylindermantelförmige Innenfläche 30 der Öffnung 22 ausgebildet. Die Achse 21 der Pumpenwelle 15 ist zumindest im Wesentlichen zentrisch zu der zylindermantelförmigen Innenfläche 30 orientiert. In der Öffnung 22 ist ein Wellendichtring 31 angeordnet, der in Umfangsrichtung betrachtet, ein auf einer Seite geöffnetes Profil aufweist. In diesem Ausführungsbeispiel ist das Profil zu dem zweiten Pumpenteil 3 hin geöffnet. Der Wellendichtring 31 ist so ausgestaltet, dass eine zumindest im Wesentlichen zylindermantelförmige Außenfläche 32 des Wellendichtrings 31 ausgebildet ist. Der Wellendichtring 31 liegt an dieser Außenfläche 32 flächig an der zylindermantelförmigen Innenfläche 30 der Öffnung 22 an, so dass eine zuverlässige Dichtwirkung im Bereich zwischen der Außenfläche 32 des Wellendichtrings 31 und der Innenfläche 30 der Öffnung 22 gegeben ist.On the housing part 16, an at least substantially cylindrical jacket-shaped inner surface 30 of the opening 22 is formed. The axis 21 of the pump shaft 15 is oriented at least substantially centrally to the cylinder jacket-shaped inner surface 30. In the opening 22, a shaft sealing ring 31 is arranged, which, viewed in the circumferential direction, has a profile opened on one side. In this embodiment, the profile is open to the second pump part 3. The shaft sealing ring 31 is configured such that an outer surface 32 of the shaft sealing ring 31, which is at least substantially cylindrical, is formed. The shaft sealing ring 31 rests flat on this outer surface 32 against the cylinder jacket-shaped inner surface 30 of the opening 22, so that a reliable sealing effect is provided in the region between the outer surface 32 of the shaft sealing ring 31 and the inner surface 30 of the opening 22.
Ferner weist der Dichtring im Profil ein zur Pumpenwelle 15 gerichtetes, dreieckförmiges Innenstück 33 auf. Das Innenstück 33 des Wellendichtrings 31 ist so ausgestaltet, dass eine kreislinienförmige Dichtkante 34 an dem Wellendichtring 31 vorgesehen ist, an der ein Kontakt zwischen dem Wellendichtring 31 und der Pumpenwelle 15 besteht. Somit liegt der Wellendichtring 31 an der kreislinienförmigen Dichtkante 34 umfänglich an der Pumpenwelle 15 an. Ferner weist der Wellendichtring 31 ein als Spannring ausgestaltetes Spannelement 35 auf, das in den im Profil betrachtet einseitig geöffneten Wellendichtring 31 eingesetzt ist. Das Spannelement 35 kann beispielsweise aus einem Metallring gebildet sein. Das Spannelement 35 wird beim Einbringen in den Wellendichtring 31 elastisch vorgespannt, wobei im montierten Zustand, der in der Fig. 2 dargestellt ist, weiterhin eine gewisse Vorspannung des Spannelements 35 des Wellendichtrings 31 besteht. Somit wird durch die Vorspannung des Spannelements 35 die Dichtkante 34 an dem Innenstück 33 des Wellendichtrings 31 gegen die Pumpenwelle 15 gepresst. Dadurch ergibt sich eine zuverlässige Abdichtung zwischen dem Wellendichtring 31 und der Pumpenwelle 15 im Bereich der Dichtkante 34.Furthermore, the sealing ring has in profile a directed toward the pump shaft 15, triangular inner piece 33. The inner piece 33 of the shaft sealing ring 31 is designed such that a circular sealing edge 34 is provided on the shaft sealing ring 31, at which there is a contact between the shaft sealing ring 31 and the pump shaft 15. Thus, the shaft sealing ring 31 abuts circumferentially on the pump shaft 15 at the circular sealing edge 34. Furthermore, the shaft sealing ring 31 has a tensioning element designed as a clamping ring 35, which is inserted into the shaft sealing ring 31 which is open on one side in the profile. The clamping element 35 may be formed, for example, of a metal ring. The clamping element 35 is resiliently biased when introduced into the shaft sealing ring 31, wherein in the mounted state, which is shown in FIG. 2, a certain bias of the clamping element 35 of the shaft seal 31 continues. Thus, the sealing edge 34 is pressed against the pump shaft 15 on the inner piece 33 of the shaft sealing ring 31 by the bias of the clamping element 35. This results in a reliable seal between the shaft seal 31 and the pump shaft 15 in the region of the sealing edge 34th
Somit erzeugt der Wellendichtring 31 sowohl im Bereich seiner Außenfläche 32 zu dem Gehäuseteil 16 hin als auch im Bereich seiner Dichtkante 34 zu der Pumpenwelle 15 hin eine zuverlässige Dichtwirkung. Der Wellendichtring 31 dichtet daher den zweiten Pumpenteil 3 zuverlässig gegenüber dem ersten Pumpenteil 2 ab. Somit tritt keine oder höchstens eine geringfügige Leckage von dem zweiten Pumpenteil 3 in den Raum 23 des ersten Pumpenteils 2 auf. Dies ermöglicht, dass der erste Pumpenteil 2 dichtungsfrei ausgestaltet ist, speziell dass der erste Pumpenteil 2 deckellos ausgestaltet ist. Daher genügt eine Abdeckung des ersten Pumpenteils 2 mit der Abdeckung 7.Thus, the shaft seal 31 generates both in the region of its outer surface 32 to the housing part 16 out as well as in the region of its sealing edge 34 to the pump shaft 15 toward a reliable sealing effect. The shaft seal 31 therefore seals the second pump part 3 reliably relative to the first pump part 2. Thus, no or at most a slight leakage occurs from the second pump part 3 in the space 23 of the first pump part 2. This makes it possible for the first pump part 2 to be designed without seals, specifically that the first pump part 2 is designed to be cap-free. Therefore, a cover of the first pump part 2 with the cover 7 is sufficient.
Die Pumpenwelle 15 kann als Polygonwelle oder als Nockenwelle ausgestaltet sein.The pump shaft 15 may be configured as a polygonal shaft or as a camshaft.
Die Brennstoffpumpe 1 des Ausführungsbeispiels der Erfindung hat den Vorteil, dass der Wellendichtring 31 in die Öffnung 22 des Gehäuseteils 16 integriert ist. Der Wellendichtring 31 kann dabei im Wesentlichen aus einem elastischen Material gebildet sein, beispielsweise einem elastischen Kunststoff, wobei das Spannelement 35 des Wellendichtrings 31 vorzugsweise aus einem metallischen Material gebildet ist.The fuel pump 1 of the embodiment of the invention has the advantage that the shaft seal 31 is integrated in the opening 22 of the housing part 16. The shaft seal 31 may be formed substantially of an elastic material, for example, an elastic plastic, wherein the clamping element 35 of the shaft seal 31 is preferably formed of a metallic material.
Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt. The invention is not limited to the described embodiments.

Claims

Ansprüche claims
1. Brennstoffpumpe (1), insbesondere Pumpenanordnung mit einer Außenzahnradpumpe für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen, mit einem ersten Pumpenteil (2), der eine Zahnradpumpe aufweist, und zumindest einem zweiten Pumpenteil (3), wobei der erste Pumpenteil (2) von dem zweiten Pumpenteil (3) mittels zumindest eines Gehäuseteils (16) getrennt ist und wobei eine Pumpenwelle (15) durch eine Öffnung (22) in dem Gehäuseteil (16) ragt, dadurch gekennzeichnet, dass in der Öffnung (22) ein Wellendichtring (31) angeordnet ist, der den ersten Pumpenteil (2) gegenüber dem zweiten Pumpenteil (3) abdichtet.1. A fuel pump (1), in particular pump arrangement with an external gear pump for fuel injection systems of air-compressing, self-igniting internal combustion engines, with a first pump part (2) having a gear pump, and at least a second pump part (3), wherein the first pump part (2) of the second pump part (3) is separated by means of at least one housing part (16) and wherein a pump shaft (15) projects through an opening (22) in the housing part (16), characterized in that in the opening (22) a shaft sealing ring (31 ) is arranged, which seals the first pump part (2) relative to the second pump part (3).
2. Brennstoffpumpe nach Anspruch 1, dadurch gekennzeichnet, dass der zweite Pumpenteil (3) als Hochdruck-Pumpenteil ausgestaltet ist, dass der zweite Pumpenteil (3) ein Hochdruckpumpengehäuse (9) aufweist und dass das Hochdruckpumpengehäuse (9) den Gehäuseteil (16), der den ersten Pumpenteil (2) von dem zweiten Pumpenteil (3) trennt, umfasst.2. Fuel pump according to claim 1, characterized in that the second pump part (3) is designed as a high-pressure pump part, that the second pump part (3) has a high-pressure pump housing (9) and that the high-pressure pump housing (9) the housing part (16), which separates the first pump part (2) from the second pump part (3).
3. Brennstoffpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Wellendichtring (31) eine Außenfläche (32) aufweist und dass der Wellendichtring (31) an seiner Außenfläche (32) zumindest mittelbar an einer Innenfläche (30) der Öffnung (22) anliegt.3. A fuel pump according to claim 1 or 2, characterized in that the shaft sealing ring (31) has an outer surface (32) and that the shaft seal (31) on its outer surface (32) at least indirectly on an inner surface (30) of the opening (22). is applied.
4. Brennstoffpumpe nach Anspruch 3, dadurch gekennzeichnet, dass die Innenfläche (30) der Öffnung (22), an der der Wellendichtring (31) mit seiner Außenfläche (32) anliegt, zumindest im Wesentlichen zylindermantelförmig ausgebildet ist und dass der Wellendichtring (31) flächig an der zylindermantelförmigen Innenfläche (30) der Öffnung (22) anliegt.4. A fuel pump according to claim 3, characterized in that the inner surface (30) of the opening (22) on which the shaft seal (31) rests with its outer surface (32), at least substantially cylindrical jacket-shaped and that the shaft seal (31) flat against the cylinder jacket-shaped inner surface (30) of the opening (22).
5. Brennstoffpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Wellendichtring (31) an einem Innenstück (33) eine zumindest im Wesentlichen kreislinienförmige Dichtkante (34) aufweist und dass der Wellendichtring (31) mit seiner kreislinienförmigen Dichtkante (34) an der Pumpenwelle (15) anliegt. 5. Fuel pump according to one of claims 1 to 4, characterized in that the shaft seal (31) on an inner piece (33) has an at least substantially circular sealing edge (34) and that the shaft seal (31) with its circular sealing edge (34) on the pump shaft (15) is applied.
6. Brennstoffpumpe nach Anspruch 5, dadurch gekennzeichnet, dass der Wellendichtring (31) ein Spannelement (35), insbesondere einen Spannring, aufweist und dass das Spannelement (35) das Innenstück (33) des Wellendichtrings (31) mit der kreislinienförmigen Dichtkante (34) umfänglich gegen die Pumpenwelle (15) presst.6. Fuel pump according to claim 5, characterized in that the shaft sealing ring (31) has a clamping element (35), in particular a clamping ring, and that the clamping element (35), the inner piece (33) of the shaft sealing ring (31) with the circular sealing edge (34 ) circumferentially against the pump shaft (15) presses.
7. Brennstoffpumpe nach Anspruch 6, dadurch gekennzeichnet, dass der Wellendichtring (31) ein einseitig geöffnetes Profil aufweist und dass das Spannelement (35) unter einer Vorspannung in den Wellendichtring (31) eingesetzt ist.7. A fuel pump according to claim 6, characterized in that the shaft seal (31) has a profile open on one side and that the clamping element (35) is inserted under a bias in the shaft seal (31).
8. Brennstoffpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der erste Pumpenteil (2) zumindest im Wesentlichen dichtungsfrei ausgestaltet ist.8. Fuel pump according to one of claims 1 to 7, characterized in that the first pump part (2) is configured at least substantially seal-free.
9. Brennstoffpumpe nach Anspruch 8, dadurch gekennzeichnet, dass der erste Pumpenteil (2) deckellos ausgestaltet ist.9. A fuel pump according to claim 8, characterized in that the first pump part (2) is designed coverless.
10. Brennstoffpumpe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der erste Pumpenteil (2) eine Kupplung (24) und zumindest ein Zahnrad (19) aufweist, wobei das Zahnrad (19) mittels der Kupplung (24) mit der Pumpenwelle (15) in Wirkverbindung steht. 10. Fuel pump according to one of claims 1 to 9, characterized in that the first pump part (2) has a coupling (24) and at least one gear (19), wherein the gear (19) by means of the coupling (24) with the pump shaft (15) is in operative connection.
EP09723427A 2008-03-17 2009-01-23 Fuel pump Not-in-force EP2255089B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000700A DE102008000700A1 (en) 2008-03-17 2008-03-17 fuel pump
PCT/EP2009/050751 WO2009115357A1 (en) 2008-03-17 2009-01-23 Fuel pump

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EP2255089A1 true EP2255089A1 (en) 2010-12-01
EP2255089B1 EP2255089B1 (en) 2012-09-26

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EP09723427A Not-in-force EP2255089B1 (en) 2008-03-17 2009-01-23 Fuel pump

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EP (1) EP2255089B1 (en)
CN (1) CN101978163A (en)
DE (1) DE102008000700A1 (en)
WO (1) WO2009115357A1 (en)

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Publication number Priority date Publication date Assignee Title
ITMI20130239A1 (en) * 2013-02-20 2014-08-21 Bosch Gmbh Robert PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
DE102014211946A1 (en) 2014-06-23 2015-12-24 Robert Bosch Gmbh Gear pump for a fuel injection system

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DE4103986C2 (en) 1990-02-10 1999-11-25 Zahnradfabrik Friedrichshafen Double pump
DE4217259A1 (en) 1992-05-25 1992-11-12 Zahnradfabrik Friedrichshafen DOUBLE PUMP
DE19736160A1 (en) * 1997-08-20 1999-02-25 Bosch Gmbh Robert High pressure fuel pump for IC engine in common rail systems
JP2005016514A (en) * 2003-06-04 2005-01-20 Denso Corp Fuel supply device
CN2826094Y (en) * 2005-09-29 2006-10-11 蒋春雷 Oil seal with improved oil return thread structure

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Title
See references of WO2009115357A1 *

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WO2009115357A1 (en) 2009-09-24
DE102008000700A1 (en) 2009-09-24
EP2255089B1 (en) 2012-09-26

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