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EP1604112A1 - Radial piston pump - Google Patents

Radial piston pump

Info

Publication number
EP1604112A1
EP1604112A1 EP04713078A EP04713078A EP1604112A1 EP 1604112 A1 EP1604112 A1 EP 1604112A1 EP 04713078 A EP04713078 A EP 04713078A EP 04713078 A EP04713078 A EP 04713078A EP 1604112 A1 EP1604112 A1 EP 1604112A1
Authority
EP
European Patent Office
Prior art keywords
pump housing
cylinder insert
cylinder
channel
sealing
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
EP04713078A
Other languages
German (de)
French (fr)
Other versions
EP1604112B1 (en
Inventor
Werner Knauth
Uwe Nigrin
Ngoc-Tam Vu
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.)
VDO Automotive AG
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1604112A1 publication Critical patent/EP1604112A1/en
Application granted granted Critical
Publication of EP1604112B1 publication Critical patent/EP1604112B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B1/0448—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
    • F04B1/0404—Details or component parts
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly

Definitions

  • the invention relates to a radial piston pump for generating high fuel pressure in fuel injection systems.
  • a high-pressure fuel pump is known from DE 198 41 642 C2, which has a pump housing and a plurality of cylinder heads designed as cylinder inserts. Each cylinder insert is fixed in the pump housing via a centering shoulder.
  • An intake pipe leads from the pump housing into the cylinder head. The fuel reaches the cylinder chamber from the intake pipe via an intake valve. The fuel is compressed there and then returns to the pump housing via a high-pressure valve and a high-pressure line, from where the fuel reaches a common high-pressure accumulator, the so-called common rail.
  • An O-ring seal is arranged between the cylinder insert and the pump housing. The cylinder insert has a groove to accommodate the O-ring seal.
  • the object of the invention is therefore at r simple installation of the cylinder insert, secure sealing of the fuel ochtikpumpe be guaranteed.
  • the invention is characterized in that the cylinder insert with an end face on a flattened portion of the pump and that the end face of the cylinder insert or the flattening of the pump housing has specifically designed raised sealing areas that are small in relation to the entire end face of the cylinder insert and the total flattening of the pump housing, whereby a high surface pressure can be achieved in the sealing area.
  • a preferred embodiment of the invention provides that a first raised sealing area is formed around the intake duct and a second raised sealing area around the high pressure duct.
  • the raised sealing areas can be made as small as possible, which enables a high surface pressure.
  • a further preferred embodiment of the invention provides that an additional third raised sealing area is formed around the first and the second sealing area, which completely surrounds the two sealing areas. This ensures that in the event of a leak in the first and / or the second sealing area, no fuel can escape to the outside through the sealing surfaces, but rather the tightness is still guaranteed by the third, surrounding sealing area.
  • FIG. 1 shows a detailed view of the high-pressure fuel pump according to the invention
  • FIG. 2 shows an exploded view of a cylinder insert according to the invention
  • Figure 1 shows a detailed view of the high pressure fuel pump.
  • the drawing shows a part of the pump housing 1 and a cylinder insert 2.
  • cylinder insert 2 is fixed in the pump housing 1 by means of a centering projection and rests with an end face 5 on a flat 6 of the pump housing.
  • the cylinder insert 2 is clamped to the pump housing 1 by means of clamping means, not shown, preferably screws.
  • An intake duct 8 and a high-pressure duct 9 are introduced into the cylinder insert 2, each opening into the end face 5.
  • the pump housing 1 has a first channel 10, which corresponds to the suction channel 8, and a second channel 11, which corresponds to the high-pressure channel 9, which open into the flat 6 of the pump housing 1.
  • the first channel 10 is arranged essentially in alignment with the intake channel 8 and the second channel 11 is aligned with the high-pressure channel 9.
  • the fuel passes from the pump housing 1, via the first channel 10 to the intake channel 8 and via an intake valve into the cylinder chamber 3. There the fuel is compressed and then flows through a high pressure valve, the high pressure channel 9 and the second channel 11 to a common high pressure accumulator (not shown) .
  • the end face 5 of the cylinder insert 2, which rests on the flattened portion 6 of the base housing 1, has a plurality of raised areas 12, 13, 14. Due to the raised areas 12 1 , 13, 14, the sealing area, ie the contact surface on the flattened portion 6, is reduced in such a way that, with the same tightening force, a significantly higher surface pressure is achieved than in the case of a flat end face. In this way, a secure seal of the cylinder insert 2 with respect to the pump housing 1 is achieved.
  • the first raised sealing region 12 is formed around the intake duct 8 and the second raised sealing region 13 around the high-pressure duct 9.
  • the sealing force is brought into the vicinity of the areas to be sealed.
  • the sealing surface can be minimized, which leads to a high surface pressure in the sealing area.
  • an additional third raised sealing area 14 is formed which completely encloses the two sealing areas 12, 13. This ensures that, in the event of a leak in the first and / or second sealing area, no fuel can escape to the outside via the sealing surfaces, but rather the tightness is still guaranteed by the third, surrounding sealing area.
  • a cavity 15 formed by the third raised sealing area 14 of the first and second sealing area 12, 13 completely surrounds, is, in which the liquid in case of leakage of the first or second "sealing region 12, drain 13 can. 1
  • an outlet channel 16 is preferably provided in the cavity 15. The fuel can flow back to the fuel tank via the outlet channel 16.
  • the cavity 15 can be used for monitoring purposes.
  • a corresponding sensor can be arranged inside the cavity In the event of a leak in the first and / or second
  • FIG. 2 shows an exploded view of the cylinder insert 2 used in FIG. 1, with a first raised sealing area 12 and a second raised sealing area 13.
  • the first and second raised sealing areas 12, 13 are essentially ring-shaped around the center of the intake duct 8 and the high pressure duct 9 trained.
  • the two raised sealing areas 12, 13 are completely enclosed by a third raised sealing area 14. If one of the two sealing surfaces leaks, the fuel can flow out into the cavity 15 and back to the fuel tank via the outlet channel 16.
  • the specifically designed raised sealing areas 12, 13 and 14 are small in relation to the entire end face 5 of the cylinder insert 2. This results in a high surface pressure in the sealing area and thus a secure seal.
  • an elastomer seal can also be provided in the area of the high-pressure duct 9.
  • the elastomer seal is preferably arranged together with a support ring 18 centrally in a recess, not shown, around the high-pressure channel 9.
  • four support surfaces 18 are preferably provided on the outer corners of the end face 5.
  • the sealing contour can advantageously be produced by electrochemical removal processes, by a screen printing process, by etching, eroding or surface embossing.
  • the raised areas preferably protrude 0.1 to 0.3 mm. This ensures that when the cylinder insert is clamped to the pump housing, only the raised areas come into contact and the other surface does not touch. At the same time, the necessary material removal remains low, which results in a short processing time.
  • the proposed invention thus ensures a secure seal of the cylinder insert with respect to the pump housing.
  • An additional third raised sealing area which surrounds the first and second sealing areas, ensures that the fuel cannot escape from the pump housing even in the event of a leak.
  • the invention is of course not limited to the exemplary embodiments.
  • different configurations of the raised sealing areas are possible.
  • the raised sealing areas can have different heights, which means that, for example, a higher surface pressure can be introduced in the high pressure area than in the low pressure area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a radial piston pump for generation of high fuel pressures in fuel injection systems, comprising a pump housing (1), a pump shaft and at least one cylinder insert (2), arranged radially to the pump shaft. A cylinder chamber (3) is located within the cylinder insert (2) in which a piston (4) can move back and forth. The cylinder insert (2) is connected with a front face (5) to a flattening (6) of the pump housing (1), by connecting means. The cylinder insert (2) comprises an inlet port (8) and a high pressure port (9). The front face (5) of the cylinder insert (2) and/or the flattening (6) of the pump housing (1) comprise precisely machined raised sealing regions (12, 13, 14) for sealing the cylinder insert (2) against the pump housing (1), which are relatively small in relation to the total front face (5) of the cylinder insert (2) and the total flattening (6) of the pump housing (1). A high surface pressure is thus achieved in the sealing region.

Description

Beschreibungdescription

RadialkolbenpumpeRadial piston pump

Die Erfindung betrifft eine Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen.The invention relates to a radial piston pump for generating high fuel pressure in fuel injection systems.

Aus der DE 198 41 642 C2 ist eine Kraftstoffhochdruckpumpe bekannt, die ein Pumpengehäuse und mehrere als Zylinderein- sätze ausgebildete Zylinderköpfe aufweist. Jeder Zylindereinsatz ist über einen Zentrieransatz im Pumpengehäuse fixiert. Vom Pumpengehäuse führt eine Ansaugleitung in den Zylinderkopf. Der Kraftstoff gelangt von der Ansaugleitung über ein Ansaugventil zum Zylinderraum. Dort wird der Kraftstoff ver- dichtet und gelangt anschließend über ein Hochdruckventil und eine Hochdruckleitung zurück in das Pumpengehäuse, von wo der Kraftstoff zu einem gemeinsamen Hochdruckspeicher, dem so genannten Common-Rail, gelangt. Zwischen dem Zylindereinsatz und dem Pumpengehäuse ist eine O-Ring-Dichtung angeordnet. Zur Aufnahme der O-Ring-Dichtung weist der Zylindereinsatz eine Nut auf. Das Einlegen des O-Rings erfordert einen hohen Montageaufwand und es kann leicht passieren, dass der O-Ring nicht richtig in der Nut liegt . Beim Verschrauben des Zylindereinsatzes wird der O-Ring dann zwischen den Dichtflächen der beiden Bauteile eingequetscht und beschädigt. Dadurch kann Kraftstoff aus der Kraftstoffhochdruckpumpe austreten.A high-pressure fuel pump is known from DE 198 41 642 C2, which has a pump housing and a plurality of cylinder heads designed as cylinder inserts. Each cylinder insert is fixed in the pump housing via a centering shoulder. An intake pipe leads from the pump housing into the cylinder head. The fuel reaches the cylinder chamber from the intake pipe via an intake valve. The fuel is compressed there and then returns to the pump housing via a high-pressure valve and a high-pressure line, from where the fuel reaches a common high-pressure accumulator, the so-called common rail. An O-ring seal is arranged between the cylinder insert and the pump housing. The cylinder insert has a groove to accommodate the O-ring seal. Inserting the O-ring requires a lot of assembly work and it can easily happen that the O-ring does not lie correctly in the groove. When the cylinder insert is screwed together, the O-ring is squeezed between the sealing surfaces of the two components and damaged. This allows fuel to escape from the high-pressure fuel pump.

Die Aufgabe der Erfindung ist es daher, beir einfacher Montage des Zylindereinsatzes, eine sichere Abdichtung der Kraft- stoff ochdruckpumpe zu gewährleisten.The object of the invention is therefore at r simple installation of the cylinder insert, secure sealing of the fuel ochdruckpumpe be guaranteed.

Die Aufgabe wird gelöst durch die Merkmale des Patentanspruchs 1. Vorteilhafte Ausgestaltung der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is achieved by the features of patent claim 1. Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung zeichnet sich dadurch aus, dass der Zylindereinsatz mit einer Stirnfläche an einer Abflachung des Pumpen- gehäuses anliegt und dass die Stirnfläche des Zylindereinsatzes oder die Abflachung des Pumpengehäuses gezielt ausgearbeitete erhabene Dichtbereiche aufweist, die klein sind im Verhältnis zur gesamten Stirnfläche des Zylindereinsatzes so- wie zur gesamten Abflachung des Pumpengehäuses, wodurch eine hohe Flächenpressung im Dichtbereich erzielbar ist. Hierdurch kann auf einem zusätzlichen O-Ring verzichtet werden, wodurch sich die Montage des Zylindereinsatzes deutlich vereinfacht. Eine Beschädigung der Dichtfläche bei der Montage ist weitge- hend ausgeschlossen.The invention is characterized in that the cylinder insert with an end face on a flattened portion of the pump and that the end face of the cylinder insert or the flattening of the pump housing has specifically designed raised sealing areas that are small in relation to the entire end face of the cylinder insert and the total flattening of the pump housing, whereby a high surface pressure can be achieved in the sealing area. This means that there is no need for an additional O-ring, which considerably simplifies the assembly of the cylinder insert. Damage to the sealing surface during assembly is largely excluded.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass ein erster erhabener Dichtbereich um den Ansaugkanal und ein zweiter erhabener Dichtbereich um den Hochdruckkanal ausge- bildet ist. Hierdurch können die erhabenen Dichtbereiche möglichst klein gestaltet werden, wodurch eine hohe Flächenpressung ermöglicht wird.A preferred embodiment of the invention provides that a first raised sealing area is formed around the intake duct and a second raised sealing area around the high pressure duct. As a result, the raised sealing areas can be made as small as possible, which enables a high surface pressure.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass ein zusätzlicher dritter erhabener Dichtbereich um den ersten und den zweiten Dichtbereich ausgebildet ist, der die beiden Dichtbereich vollständig umschließt. Hierdurch ist gewährleistet, dass im Falle einer Undichtigkeit des ersten und/oder des zweiten Dichtbereichs kein Kraftstoff über die Dichtflächen nach außen gelangen kann, sondern durch den dritten umschließenden Dichtbereich die Dichtigkeit weiterhin gewährleistet bleibt. fA further preferred embodiment of the invention provides that an additional third raised sealing area is formed around the first and the second sealing area, which completely surrounds the two sealing areas. This ensures that in the event of a leak in the first and / or the second sealing area, no fuel can escape to the outside through the sealing surfaces, but rather the tightness is still guaranteed by the third, surrounding sealing area. f

Ausführungsbeispiele der Erfindung werden im Folgenden anhand der schematischen Zeichnungen erläutert. Es zeigen:Exemplary embodiments of the invention are explained below using the schematic drawings. Show it:

Figur 1 eine Detailansicht der erfindungsgemäßen Kraftstoffhochdruckpumpe, Figur 2 eine Explosionsdarstellung eines erfindungsgemäße Zylindereinsatzes. Figur 1 zeigt eine Detailansicht der Kraftstoffhochdruckpumpe . Die Zeichnung zeigt einen Teil des Pumpengehäuses 1 sowie einen Zylindereinsatz 2. üblicherweise sind mehrere vorzugsweise drei in einem Winkel von 120° zueinander versetzte Zy- lindereinsätze vorgesehen. Der Zylindereinsatz 2 ist über einen Zentrieransatz im Pumpengehäuse 1 fixiert und liegt mit einer Stirnfläche 5 an einer Abflachung 6 des Pumpengehäuses an. Der Zylindereinsatz 2 wird mit dem Pumpengehäuse 1 über nicht dargestellte Spannmittel, vorzugsweise Schrauben, ver- spannt. In den Zylindereinsatz 2 ist ein Ansaugkanal 8 sowie ein Hochdruckkanal 9 eingebracht, die jeweils in der Stirnfläche 5 münden. Das Pumpengehäuse 1 weist einen ersten, mit dem Ansaugkanal 8 korrespondierenden Kanal 10, sowie einen zweiten, mit dem Hochdruckkanal 9 korrespondierenden Kanal 11 auf, die in der Abflachung 6 des Pumpengehäuses 1 münden. Der erste Kanal 10 ist zu dem Ansaugkanal 8 und der zweite Kanal 11 ist zu dem Hochdruckkanal 9 im wesentlichen fluchtend angeordnet . Der Kraftstoff gelangt vom Pumpengehäuse 1, über den ersten, Kanal 10 zum Ansaugkanal 8 und über ein Ansaugventil in den Zylinderraum 3. Dort wird der Kraftstoff verdichtet und strömt anschließend, über ein Hochdruckventil, den Hochdruckkanal 9 und den zweiten Kanal 11 zu einem gemeinsamen Hochdruckspeicher (nicht dargestellt) .1 shows a detailed view of the high-pressure fuel pump according to the invention, FIG. 2 shows an exploded view of a cylinder insert according to the invention. Figure 1 shows a detailed view of the high pressure fuel pump. The drawing shows a part of the pump housing 1 and a cylinder insert 2. Usually, several, preferably three, cylinder inserts, preferably offset at an angle of 120 °, are provided. The cylinder insert 2 is fixed in the pump housing 1 by means of a centering projection and rests with an end face 5 on a flat 6 of the pump housing. The cylinder insert 2 is clamped to the pump housing 1 by means of clamping means, not shown, preferably screws. An intake duct 8 and a high-pressure duct 9 are introduced into the cylinder insert 2, each opening into the end face 5. The pump housing 1 has a first channel 10, which corresponds to the suction channel 8, and a second channel 11, which corresponds to the high-pressure channel 9, which open into the flat 6 of the pump housing 1. The first channel 10 is arranged essentially in alignment with the intake channel 8 and the second channel 11 is aligned with the high-pressure channel 9. The fuel passes from the pump housing 1, via the first channel 10 to the intake channel 8 and via an intake valve into the cylinder chamber 3. There the fuel is compressed and then flows through a high pressure valve, the high pressure channel 9 and the second channel 11 to a common high pressure accumulator (not shown) .

Die Stirnfläche 5 des Zylindereinsatzes 2 , welcher an der Abflachung 6 des Bodengehäuses 1 anliegt, weist mehrere erhabene Bereiche' 12,- 13, 14 auf. Durch die erhabenen Bereiche 121, 13, 14 wird der Dichtbereich d. h. die Auflagefläche an der Abflachung 6 derart verkleinert, dass bei gleicher Anzugskraft eine deutlich höhere Flächenpressung erreicht wird, als im Falle einer ebenen Stirnfläche. Hierdurch wird eine sichere Abdichtung des Zylindereinsatzes 2 gegenüber dem Pumpengehäuse 1 erreicht. Selbstverständlich ist es auch möglich die erhabenen Bereiche in der Abflachung 6 des Pumpengehäuses 1 auszubilden. Auch ist es möglich die erhabenen Bereiche sowohl im Zylindereinsatz 2, als auch im Pumpengehäuse 1 auszu- bilden. Aus Kostengründen ist es allerdings vorteilhaft die erhabenen Dichtbereiche nur in einem Bauteil vorzusehen und die korrespondierende Fläche als plane Fläche auszubilden. Auf eine hohe Güte der planen Dichtfläche kann dabei verzich- tet werden, da die hohen Flächenpressungen einen Ausgleich der Unebenheiten, durch das elastische Verformen des Materials im Bereich der Dichtflächen, ermöglicht.The end face 5 of the cylinder insert 2, which rests on the flattened portion 6 of the base housing 1, has a plurality of raised areas 12, 13, 14. Due to the raised areas 12 1 , 13, 14, the sealing area, ie the contact surface on the flattened portion 6, is reduced in such a way that, with the same tightening force, a significantly higher surface pressure is achieved than in the case of a flat end face. In this way, a secure seal of the cylinder insert 2 with respect to the pump housing 1 is achieved. Of course, it is also possible to form the raised areas in the flat 6 of the pump housing 1. It is also possible to remove the raised areas both in the cylinder insert 2 and in the pump housing 1. form. For cost reasons, however, it is advantageous to provide the raised sealing areas in only one component and to design the corresponding surface as a flat surface. A high quality of the flat sealing surface can be dispensed with, since the high surface pressures compensate for the unevenness due to the elastic deformation of the material in the area of the sealing surfaces.

Bei dem in Figur 1 gezeigten Ausführungsbeispiel ist der ers- te erhabene Dichtbereich 12 um den Ansaugkanal 8 und der zweite erhabene Dichtbereich 13 um den Hochdruckkanal 9 ausgebildet. Hierdurch wird die Dichtkraft gezielt in die Nähe der abzudichtenden Bereiche eingebracht. Die Dichtfläche kann dadurch minimiert werden, was zu einer hohen Flächenpressung im Dichtbereich führt.In the exemplary embodiment shown in FIG. 1, the first raised sealing region 12 is formed around the intake duct 8 and the second raised sealing region 13 around the high-pressure duct 9. As a result, the sealing force is brought into the vicinity of the areas to be sealed. The sealing surface can be minimized, which leads to a high surface pressure in the sealing area.

Zusätzlich zu dem ersten und zweiten erhabenen Dichtbereich 12, 13 ist ein zusätzlicher dritter erhabener Dichtbereich 14 ausgebildet, der die beiden Dichtbereiche 12, 13 vollständig umschließt. Hierdurch ist gewährleistet, dass im Falle einer Undichtigkeit des ersten und/oder zweiten Dichtbereiches kein Kraftstoff über die Dichtflächen nach außen gelangen kann sondern durch den dritten umschließenden Dichtbereich die Dichtigkeit weiterhin gewährleistet bleibt. Durch den dritten erhabenen Dichtbereich 14, der den ersten und zweiten Dichtbereich 12, 13 vollständig umschließt, wird ein Hohlraum 15 gebildet, in dem die Flüssigkeit im Falle einer Undichtigkeit des ersten bzw. zweiten "Dichtbereiches 12, 13 abfließen kann.1 Damit sich innerhalb des Hohlraums 15 kein Flüssigkeitsdruck aufbauen kann, ist vorzugsweise ein Ablaufkanal 16 vorgesehen. Über die Ablaufkanal 16 kann der Kraftstoff zurück zum Kraftstofftank fließen. Gleichzeitig kann der Hohlraum 15 zu Überwachungszwecken genutzt werden. Hierzu kann ein entsprechender Sensor innerhalb des Hohlraums angeordnet werden, der im Falle einer Undichtigkeit des ersten und/oder zweitenIn addition to the first and second raised sealing areas 12, 13, an additional third raised sealing area 14 is formed which completely encloses the two sealing areas 12, 13. This ensures that, in the event of a leak in the first and / or second sealing area, no fuel can escape to the outside via the sealing surfaces, but rather the tightness is still guaranteed by the third, surrounding sealing area. A cavity 15 formed by the third raised sealing area 14 of the first and second sealing area 12, 13 completely surrounds, is, in which the liquid in case of leakage of the first or second "sealing region 12, drain 13 can. 1 Thus, within an outlet channel 16 is preferably provided in the cavity 15. The fuel can flow back to the fuel tank via the outlet channel 16. At the same time, the cavity 15 can be used for monitoring purposes. For this purpose, a corresponding sensor can be arranged inside the cavity In the event of a leak in the first and / or second

Dichtbereiches 12, 13 ein Signal an eine entsprechende Auswerteeinheit ausgibt. Figur 2 zeigt eine Explosionsdarstellung des in Fig. 1 verwendeten Zylindereinsatzes 2, mit einem ersten erhabenen Dichtbereiches 12 sowie einem zweiten erhabenen Dichtbereich 13. Der erste und zweite erhabene Dichtbereich 12, 13 ist im Wesentlichen ringförmig um das Zentrum des Ansaugkanals 8 bzw. des Hochdruckkanals 9 ausgebildet. Die beiden erhabenen Dichtbereiche 12, 13 werden von einem dritten erhabenen Dichtbereich 14 vollständig umschlossen. Bei einer evtl. Undichtigkeit einer der beiden Dichtflächen kann der Kraftstoff in den Hohlraum 15 und über den Ablaufkanal 16 zurück zum Kraftstofftank abfließen. Wie aus der Abbildung deutlich wird, sind die gezielt ausgearbeiteten erhabenen Dichtbereiche 12, 13 und 14 klein im Verhältnis zur gesamten Stirnfläche 5 des Zylindereinsatzes 2. Hierdurch ergibt sich eine ho- he Flächenpressung im Dichtbereich und somit eine sichere Abdichtung.Sealing area 12, 13 outputs a signal to a corresponding evaluation unit. FIG. 2 shows an exploded view of the cylinder insert 2 used in FIG. 1, with a first raised sealing area 12 and a second raised sealing area 13. The first and second raised sealing areas 12, 13 are essentially ring-shaped around the center of the intake duct 8 and the high pressure duct 9 trained. The two raised sealing areas 12, 13 are completely enclosed by a third raised sealing area 14. If one of the two sealing surfaces leaks, the fuel can flow out into the cavity 15 and back to the fuel tank via the outlet channel 16. As is clear from the figure, the specifically designed raised sealing areas 12, 13 and 14 are small in relation to the entire end face 5 of the cylinder insert 2. This results in a high surface pressure in the sealing area and thus a secure seal.

Bei sehr hohen Kraftstoffdrücken kann zusätzlich im Bereich des Hochdruckkanals 9 eine Elastomerdichtung vorgesehen wer- den. Die Elastomerdichtung wird vorzugsweise zusammen mit einem Stützring 18 zentrisch in eine, nicht näher dargestellte, Ausnehmung um den Hochdruckkanal 9 angeordnet.At very high fuel pressures, an elastomer seal can also be provided in the area of the high-pressure duct 9. The elastomer seal is preferably arranged together with a support ring 18 centrally in a recess, not shown, around the high-pressure channel 9.

Um ein Verkanten des Zylindereinsatzes 2 beim Verspannen am Pumpengehäuse 1 zu verhindern sind, vorzugsweise an den äußeren Ecken der Stirnfläche 5, vier Stützflächen 18 vorgesehen.In order to prevent tilting of the cylinder insert 2 when bracing the pump housing 1, four support surfaces 18 are preferably provided on the outer corners of the end face 5.

Die Dichtkontur kann vorteilhaft durch elektrocherαische^Ab- ' tragungsverfahren, durch ein Siebdruckverfahren, durch Ätzen, Erodieren oder Flächenprägung hergestellt werden. Die erhabenen Bereiche stehen vorzugsweise 0,1 bis 0,3 mm hervor. Dies gewährleistet, dass beim Verspannen des Zylindereinsatzes mit dem Pumpengehäuse nur die erhabenen Bereiche Kontakt haben und die übrige Fläche sich nicht berühren. Gleichzeitig bleibt der notwendige Materialabtrag gering, wodurch sich eine geringe Bearbeitungszeit ergibt. Durch die vorgeschlagene Erfindung ist somit eine sichere Abdichtung des Zylindereinsatzes gegenüber dem Pumpengehäuse gewährleistet. Durch die erhabenen Dichtbereiche und die hierdurch erzielbare hohen Flächenpressungen ergibt sich eine hohe Dichtkraft. Zusätzliche Dichtelemente wie z.B. O-Ringe sind nicht erforderlich. Hierdurch vereinfacht sich der Montageaufwand erheblich. Zudem wird eine Fehlmontage weitgehend ausgeschlossen. Durch einen zusätzlichen dritten erhabenen Dichtbereich, der den ersten und zweiten Dichtbereich um- schließt, wird sichergestellt, dass auch im Falle einer Undichtigkeit der Kraftstoff nicht am Pumpengehäuse austreten kann.The sealing contour can advantageously be produced by electrochemical removal processes, by a screen printing process, by etching, eroding or surface embossing. The raised areas preferably protrude 0.1 to 0.3 mm. This ensures that when the cylinder insert is clamped to the pump housing, only the raised areas come into contact and the other surface does not touch. At the same time, the necessary material removal remains low, which results in a short processing time. The proposed invention thus ensures a secure seal of the cylinder insert with respect to the pump housing. The raised sealing areas and the high surface pressures that can be achieved thereby result in a high sealing force. Additional sealing elements such as O-rings are not necessary. This considerably simplifies the assembly effort. In addition, incorrect assembly is largely excluded. An additional third raised sealing area, which surrounds the first and second sealing areas, ensures that the fuel cannot escape from the pump housing even in the event of a leak.

Die Erfindung ist selbstverständlich nicht auf die Ausfüh- rungsbeispiele beschränkt. Insbesondere sind unterschiedliche Ausbildungen der erhabenen Dichtbereiche möglich. So können beispielsweise die erhabenen Dichtbereiche unterschiedliche Höhen aufweisen, wodurch man im Hochdruckbereich beispielsweise eine höhere Flächenpressung einbringen kann als im Nie- derdruckbereich. The invention is of course not limited to the exemplary embodiments. In particular, different configurations of the raised sealing areas are possible. For example, the raised sealing areas can have different heights, which means that, for example, a higher surface pressure can be introduced in the high pressure area than in the low pressure area.

Claims

Patentansprüche claims 1. Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen, mit einem Pumpengehäuse (1) einer Pumpenwelle und1. Radial piston pump for high-pressure fuel generation in fuel injection systems, with a pump housing (1) a pump shaft and - mindestens einem radial zur Pumpenwelle angeordneten Zylindereinsatz (2) in dem ein Zylinderraum (3) ausgebildet ist in dem ein Kolben (4) hin- und herbewegbar geführt ist wobei- At least one radially arranged to the pump shaft cylinder insert (2) in which a cylinder space (3) is formed in which a piston (4) is guided back and forth - der Zylindereinsatz (2) mit einer Stirnfläche (5) an einer Abflachung (6) des Pumpengehäuses anliegt und mit dieser durch Spannmittel verspannt ist, - der Zylindereinsatz mindestens einen Ansaugkanal (8) aufweist, durch den der Kraftstoff dem Zylinderraum zugeführt werden kann,- the cylinder insert (2) rests with an end face (5) on a flat surface (6) of the pump housing and is clamped with it by clamping means, - the cylinder insert has at least one intake duct (8) through which the fuel can be supplied to the cylinder chamber, - der Zylindereinsatz mindestens einen Hochdruckkanal (9) aufweist, über den der Kraftstoff aus dem Zylinderraum ab- fließen kann,the cylinder insert has at least one high-pressure channel (9) through which the fuel can flow out of the cylinder space, - der Ansaugkanal sowie der Hochdruckkanal in der Stirnfläche des Zylindereinsatzes enden und- The intake duct and the high pressure duct end in the end face of the cylinder insert and - im Pumpengehäuse ein erster korrespondierende Kanal (10) und ein zweiter korrespondierende Kanal (11) angeordnet- ist, die in der Abflachung des Pumpengehäuses enden und mit dem Ansaugkanal beziehungsweise dem Hochdruckkanal im wesentlichen fluchten d a d u r c h g e k e n n ze i c h n e t, ~ das's die Stirnfläche (5) des Zylindereinsatzes (2) und/oder die Abfla- chung (6) des Pumpengehäuses (1) gezielt ausgearbeitete erhabene Dichtbereiche (12) (13) (14) aufweist, die klein sind im Verhältnis zur gesamten Stirnfläche (5) des Zylindereinsatzes (2) sowie zur gesamten Abflachung (6) des Pumpengehäuses (1), wodurch eine hohe Flächenpressung im Dichtbereich (12) (13) (14) erzielbar ist. - a first corresponding in the pump housing channel (10) and a second corresponding channel is angeordnet- (11), which end in the flat portion of the pump housing and the intake duct or the high pressure passage substantially aligned dadurchgekenn ze ichnet, ~ The's the end face (5) of the cylinder insert (2) and / or the flattening (6) of the pump housing (1) has specifically designed raised sealing areas (12) (13) (14) which are small in relation to the entire end face (5) of the cylinder insert (2 ) and for the entire flattening (6) of the pump housing (1), whereby a high surface pressure in the sealing area (12) (13) (14) can be achieved. 2. Radialkolbenpumpe nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, dass ein erster erhabener Dichtbereiche (12) um den Ansaugkanal (8) und ein zweiter erhabener Dichtbereich (13) um den Hochdruckkanal (9) ausgebildet ist.2. Radial piston pump according to claim 1, so that a first raised sealing area (12) around the suction channel (8) and a second raised sealing area (13) around the high pressure channel (9) is formed. 3. Radialkolbenpumpe nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, dass der erste und zweite erhabene Dichtbereich (12) (13) im wesentlich ringförmig um das Zentrum des Ansaugkanals (8) beziehungsweise des Hochdruckkanals (9) ausgebildet sind.3. Radial piston pump according to claim 2, so that the first and second raised sealing areas (12) (13) are essentially annular around the center of the suction channel (8) and the high pressure channel (9). 4. Radialkolbenpumpe nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, dass ein zu- sätzlicher dritter erhabener Dichtbereich (14) um den ersten und zweiten Dichtbereich (12) (13) ausgebildet ist, der die beiden Dichtbereiche vollständig umschließt.4. Radial piston pump according to claim 2, so that an additional third raised sealing area (14) is formed around the first and second sealing area (12) (13), which completely encloses the two sealing areas. 5. Radialkolbenpumpe nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t, dass in der Abflachung (6) des Pumpengehäuses, innerhalb der von dem dritten Dichtbereich (14) umschlossenen Fläche, ein Ablaufkanal (16) ausgebildet ist, zum Abführen eines eventuellen Leckagestroms aus dem ersten und/oder zweiten Dichtbereich sowie zur Überwachung des Dichtungssystems .5. Radial piston pump according to claim 4, characterized in that in the flattening (6) of the pump housing, within the area enclosed by the third sealing area (14), an outlet channel (16) is formed for discharging a possible leakage flow from the first and / or second sealing area and for monitoring the sealing system. 6. Radialkolbenpumpe nach einem der vorherigen Ansprüche, d a d u r c h g e k e n n z e i c h n e t, dass eine zusätzliche Elastomerdichtung um den Hochdruckkanal (9) an- geordnet ist.6. Radial piston pump according to one of the preceding claims, that an additional elastomer seal is arranged around the high-pressure channel (9). 7. Radialkolbenpumpe nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t, dass die E- lastomerdichtung als Ringdichtung ausgebildet ist und an ihrem Außenumfang von einem Stützring (18) abgestützt wird. 7. Radial piston pump according to claim 6, so that the elastomer seal is designed as an annular seal and is supported on its outer circumference by a support ring (18).
EP04713078A 2003-03-07 2004-02-20 Radial piston pump Expired - Lifetime EP1604112B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10310123 2003-03-07
DE10310123A DE10310123A1 (en) 2003-03-07 2003-03-07 Radial piston pump
PCT/EP2004/001702 WO2004079190A1 (en) 2003-03-07 2004-02-20 Radial piston pump

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EP1604112A1 true EP1604112A1 (en) 2005-12-14
EP1604112B1 EP1604112B1 (en) 2007-07-04

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US (1) US7415920B2 (en)
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JP (1) JP4372782B2 (en)
CN (1) CN1756905B (en)
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WO (1) WO2004079190A1 (en)

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CN1756905B (en) 2011-06-08
WO2004079190A1 (en) 2004-09-16
US7415920B2 (en) 2008-08-26
DE10310123A1 (en) 2004-09-23
DE502004004234D1 (en) 2007-08-16
CN1756905A (en) 2006-04-05
JP4372782B2 (en) 2009-11-25
US20050287016A1 (en) 2005-12-29
JP2006519950A (en) 2006-08-31
EP1604112B1 (en) 2007-07-04

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