EP1704327B1 - Pompe a carburant haute pression destinee a des systemes d'injection a rampe commune - Google Patents

Pompe a carburant haute pression destinee a des systemes d'injection a rampe commune Download PDF

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Publication number
EP1704327B1
EP1704327B1 EP04766829A EP04766829A EP1704327B1 EP 1704327 B1 EP1704327 B1 EP 1704327B1 EP 04766829 A EP04766829 A EP 04766829A EP 04766829 A EP04766829 A EP 04766829A EP 1704327 B1 EP1704327 B1 EP 1704327B1
Authority
EP
European Patent Office
Prior art keywords
pump housing
shaped container
pressure
pump
pot
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.)
Not-in-force
Application number
EP04766829A
Other languages
German (de)
English (en)
Other versions
EP1704327A1 (fr
Inventor
Uwe Nigrin
Mohsen Pirouz
Stefan Portner
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.)
Siemens AG
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP1704327A1 publication Critical patent/EP1704327A1/fr
Application granted granted Critical
Publication of EP1704327B1 publication Critical patent/EP1704327B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the invention relates to a high-pressure fuel pump for common rail injection systems with a high-pressure accumulator integrated in the high-pressure fuel pump.
  • High-pressure fuel pumps for common-rail injection systems are generally designed as radial piston pumps. From the DE 102 285 51.9 the applicant is already known a radial piston high-pressure pump for common-rail injection systems with a high-pressure accumulator integrated in the radial piston high-pressure pump.
  • the radial piston high pressure pump has a housing in which a drive shaft is guided.
  • the drive shaft has an eccentric portion on which a cam ring is mounted.
  • On the cam preferably support several, with respect to the drive shaft radially in the pump body longitudinally movably guided pump piston.
  • Each pump piston is assigned a suction valve and a pressure valve. Via the suction valve, fuel is supplied from the low pressure area in the pump piston.
  • the compressed fuel is discharged via the pressure valve and fed via a high-pressure line to the common high-pressure accumulator (common rail).
  • the high-pressure accumulator is integrated in a peripheral region of the high-pressure fuel pump.
  • the object of the invention is therefore to provide a high-pressure fuel pump for common-rail injection systems with a high-pressure accumulator integrated in the radial piston high-pressure accumulator whose high-pressure accumulator volume can be changed in a simple and cost-effective manner and which is inexpensive to manufacture.
  • the invention is characterized in that the high-pressure accumulator is formed by an opening introduced into the pump housing and a cup-shaped container arranged in the opening.
  • the production of such a high-pressure accumulator is particularly simple and inexpensive.
  • the high-pressure storage volume can be easily and inexpensively changed in such a structure, in which only a cup-shaped container with a different high-pressure storage volume is used.
  • the high-pressure pump can be quickly, easily and inexpensively adapted to the particular requirements. It is not necessary to change the pump yourself. It is not even necessary to disassemble the pump for conversion.
  • a preferred embodiment of the invention provides that the opening in the pump housing and the cup-shaped container are cylindrical.
  • the cylindrical Training the components is a particularly simple production, for example by drilling or turning, possible.
  • a particularly advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and the pot-shaped container has a corresponding with the internal thread external thread.
  • the cup-shaped container can be easily screwed into the pump housing. This simplifies the assembly significantly, which further cost savings are possible.
  • a further advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and that in the internal thread a screw can be screwed, which bears against a collar of the cup-shaped container and which fixes the container in the pump housing.
  • the screw sleeve When screwed into the pump housing, the screw sleeve performs both an axial movement and a rotational movement about its axis.
  • the pot-shaped container is pressed by the threaded sleeve, however, only in the axial direction in the pump housing.
  • sealing surfaces formed on the pot-shaped container when screwing are not rotated on a corresponding sealing surface of the pump housing but merely pressed in the axial direction, whereby the sealing surfaces can be damaged less quickly.
  • a further advantageous embodiment of the invention provides that in the cylindrical opening in the pump housing and / or on an outer surface of the cup-shaped container or the lateral surface of the screw a relief groove is formed, via which a possibly between the pump housing and the pot-shaped container or the screw sleeve leaking leakage current is dissipated.
  • the relief groove is preferably connected via a discharge line to the tank or the suction side of the pump.
  • FIG. 1 shows a first exemplary embodiment of the high-pressure fuel pump.
  • the high-pressure fuel pump is designed as a radial piston pump and has a pump housing 1, in which a drive shaft 2 is rotatably mounted.
  • the drive shaft 2 is formed as an eccentric shaft.
  • the pump piston 18 are arranged on the outer circumference of the eccentric 17 preferably three, arranged at an angle and 120 degrees to each other.
  • each pump piston 18 performs a complete suction and compression stroke by.
  • the cylinder piston 18 moves in the direction of the drive shaft 2 and via a, not shown in Figure 1, the suction valve is supplied to the cylinder chamber fuel.
  • the suction valve closes and the fuel is subsequently compressed during the upward movement of the pump piston 18 to a pressure of up to 1800 bar.
  • the pressure valve 19 opens and the compressed fuel flows from the cylinder chamber, via a high-pressure line 20, to the common high-pressure accumulator 4.
  • the high-pressure accumulator is introduced from an introduced into the pump housing 1 opening 5 and in the Opening 5 arranged, cup-shaped container 6 is formed.
  • the introduction of the opening 5 can be done in a simple manner by machining, for example by drilling or turning.
  • the adaptation of the high-pressure accumulator volume to different types of engine is effected by the replacement of the cup-shaped container 6. Special refinements of the high-pressure accumulator 4 are shown in more detail in FIGS. 2 to 4 below.
  • FIG 2 shows a first embodiment of a high-pressure fuel storage 4 as it may be formed in a high-pressure fuel pump of Figure 1.
  • the high-pressure fuel accumulator 4 is formed by an opening 5 introduced into the pump housing 1 and a cup-shaped container 6 arranged in the opening 5.
  • the opening 5 in the pump housing 1 has an internal thread 7.
  • the cup-shaped container 6 has on its lateral surface a corresponding external thread 8. In this way, the cup-shaped container 6, in a particularly simple manner, in the pump housing. 1 be screwed.
  • a key-neck 21 is formed on the cup-shaped container 4.
  • the open end 13 of the cup-shaped container is formed as a flat sealing surface.
  • an annular relief groove 12 is provided in order to prevent that a possible leakage flow can pass through the thread to the outside.
  • the relief groove 12 is formed in the lateral surface of the opening 5.
  • a relief groove can also be formed in the outer circumferential surface of the cup-shaped container 6. The leakage flow from the relief groove 12, guided via a discharge line, not shown, back into the fuel tank or on the suction side of the high-pressure fuel pump. This ensures that no fuel can escape into the environment.
  • the high pressure accumulator 4 is connected via a connecting line 22 to the high pressure side of the high-pressure fuel pump.
  • the connecting line 22 opens in the embodiment shown, axially in the opening 5 of the high-pressure accumulator 4. This allows the connecting line 22 to be drilled in one step with the opening 5, without the pump housing 1 must be re-clamped. Alternatively, the connecting line 22 also in the lateral surface of the opening 5, the pressure accumulator 4, opens. From the high-pressure accumulator or the connecting line 22 branch off one or more lines, which open into one or more high-pressure ports 23.
  • the high-pressure connections 23 can be connected to lines which connect the high-pressure accumulator 4 with the injectors of an internal combustion engine. It is possible that from the high-pressure fuel pump only a high-pressure port 23 branches off and the distribution of the fuel takes place via a fuel distributor arranged outside the pump. Or it is already on the pump housing 1, a number of injectors corresponding number of high-pressure ports 23 are formed so that the individual lines can be performed directly from the pump to the individual injectors.
  • FIG. 3 shows a second exemplary embodiment of a high-pressure accumulator 4 as it can be used in a high-pressure pump according to FIG.
  • the high-pressure accumulator 4 substantially corresponds to the high-pressure accumulator as it has already been described in more detail in Figure 2. It will therefore be discussed below only the differences from this embodiment.
  • the main difference is that the lateral surface 11 of the cup-shaped container 6, in the region of the open end face 13, an outer cone 15 which is pressed against a, formed in the opening 5 of the pump housing 1, corresponding conical surface 16.
  • the conical surfaces 15, 16 serve to seal the high-pressure accumulator 4.
  • the conical design of the sealing surfaces results in a particularly secure seal. It is particularly advantageous if the pot-shaped container 6, in the region of the outer cone 15, has a reduced wall thickness. It thereby arises a slightly elastic to be deformed outer cone 15, whereby even then a secure seal is ensured when it comes to setting the screw.
  • Figure 4 shows a third embodiment of a high-pressure accumulator 4 as it can be used in the high-pressure fuel pump of Figure 1.
  • the embodiment corresponds essentially the embodiment in Figure 3, whose description is referenced here.
  • the high-pressure accumulator 4 also has an additional threaded sleeve 9, which is arranged between the pump housing 1 and the cup-shaped container 6.
  • the screw 9 is screwed into the opening 5 in the pump housing 1.
  • the tightening force of the screw is transmitted to the cup-shaped container 6 via a collar 10 formed in the cup-shaped container.
  • the outer cone 15 formed in the lateral surface of the cup-shaped container 6 is pressed against the corresponding conical surface 16 formed in the opening 5 of the pump housing 1.
  • the screw has the advantage that when tightening the connection, only the screw 9 performs a rotational movement.
  • the conical surfaces 15, 16, however, are pressed against each other only in the axial direction. It is not so easy to damage the conical surfaces and thereby damage the seal of the high-pressure accumulator.
  • the screw sleeve can be used both for a flat, end-side seal, as shown in Fig. 2, as well as for a seal over the Konusdicht vom according to FIGS. 3 and 4.
  • the invention is thus characterized by the fact that the high-pressure accumulator 4 is formed in a particularly simple manner by an opening 5 introduced into the pump housing 1 and a pot-shaped container 6 arranged in the opening 5.
  • the opening 5 can be introduced into the pump housing 1 by a simple and inexpensive exciting machining, for example by drilling or turning.
  • the storage volume of the high-pressure accumulator 4 is through the simple exchange the cup-shaped container 6 adapted to different applications.

Landscapes

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

Claims (7)

  1. Pompe haute pression à carburant pour des systèmes d'injection à rampe commune comprenant au moins :
    - un carter de pompe (1), dans lequel est monté un arbre d'entraînement (2),
    - une unité de pompe (3) qui est disposée dans le carter de pompe (1) et est entraînée par l'arbre d'entraînement (2), ainsi que
    - un réservoir à haute pression (4),
    caractérisée en ce que
    le réservoir à haute pression (4) est réalisé par une ouverture (5) introduite dans le carter de pompe (1) et un récipient (6) en forme de pot et disposé dans l'ouverture (5).
  2. Pompe haute pression à carburant selon la revendication 1,
    caractérisée en ce que
    l'ouverture (5) dans le carter de pompe (1) et le récipient (6) en forme de pot sont réalisés avec une forme cylindrique.
  3. Pompe haute pression à carburant selon la revendication 2,
    caractérisée en ce que
    l'ouverture (5) dans le carter de pompe (1) présente un filetage intérieur (7) et le récipient (6) en forme de pot présente un filetage extérieur (8) correspondant au filetage intérieur (7), de telle sorte que le récipient (6) en forme de pot peut être vissé dans le carter de pompe (1).
  4. Pompe haute pression à carburant selon la revendication 2,
    caractérisée en ce que
    l'ouverture (5) dans le carter de pompe (1) présente un filetage intérieur (7) qui peut être vissé dans le filetage intérieur (7) d'un manchon à vis (9) qui s'applique sur une collerette (10) du récipient (6) en forme de pot et qui fixe le récipient (6) dans le carter de pompe (1).
  5. Pompe haute pression à carburant selon la revendication 2 ou 3,
    caractérisée en ce que
    une rainure de délestage (12) est réalisée dans l'ouverture (5) de forme cylindrique dans le carter de pompe (1) et/ou sur une surface d'enveloppe (11) extérieure du récipient (6) en forme de pot, rainure par laquelle un flux de fuite sortant éventuellement entre le carter de pompe (1) et le récipient (6) en forme de pot peut être évacué.
  6. Pompe haute pression à carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    un côté avant (13) ouvert du récipient (6) en forme de pot est conçu comme surface d'étanchéité, qui est pressée contre une surface (14) correspondante dans le carter de pompe (1), de sorte qu'une étanchéité du réservoir à haute pression (4) est obtenue.
  7. Pompe haute pression à carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    une surface d'enveloppe (11) du récipient (6) en forme de pot présente dans la zone du côté avant (13) ouvert un cône extérieur (15) qui est pressé contre une surface (16) conique correspondante, réalisée dans l'ouverture (5) du carter de pompe (1), de sorte qu'on obtient une étanchéité du réservoir à haute pression (5).
EP04766829A 2003-12-22 2004-09-21 Pompe a carburant haute pression destinee a des systemes d'injection a rampe commune Not-in-force EP1704327B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003160534 DE10360534B4 (de) 2003-12-22 2003-12-22 Kraftstoffhochdruckpumpe für Common-Rail-Einspritzsysteme
PCT/EP2004/052252 WO2005061890A1 (fr) 2003-12-22 2004-09-21 Pompe a carburant haute pression destinee a des systemes d'injection a rampe commune

Publications (2)

Publication Number Publication Date
EP1704327A1 EP1704327A1 (fr) 2006-09-27
EP1704327B1 true EP1704327B1 (fr) 2007-07-18

Family

ID=34683764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766829A Not-in-force EP1704327B1 (fr) 2003-12-22 2004-09-21 Pompe a carburant haute pression destinee a des systemes d'injection a rampe commune

Country Status (3)

Country Link
EP (1) EP1704327B1 (fr)
DE (2) DE10360534B4 (fr)
WO (1) WO2005061890A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010001252A1 (de) * 2010-01-27 2011-07-28 Robert Bosch GmbH, 70469 Kraftstoffeinspritzsystem mit integriertem Hochdruckspeicher an einem Zylinderkopf
DE102010002291A1 (de) * 2010-02-24 2011-08-25 Robert Bosch GmbH, 70469 Hochdruckpumpe und Hochdruckspeicher
DE102018215132A1 (de) * 2018-09-06 2020-03-12 Ford Global Technologies, Llc Hochdruckpumpe für eine Treibstoffzufuhr eines Verbrennungsmotors

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747736C1 (de) * 1997-10-29 1999-04-08 Siemens Ag Druckspeicher für Kraftstoffversorgungssysteme
JP2001020830A (ja) * 1999-07-09 2001-01-23 Usui Internatl Ind Co Ltd ディーゼル機関用高圧燃料噴射管
DE10118884A1 (de) * 2001-04-18 2002-11-07 Bosch Gmbh Robert Hochdruck-Kraftstoffpumpe für ein Kraftstoffsystem einer direkteinspritzenden Brennkraftmaschine, Kraftstoffsystem sowie Brennkraftmaschine
JP2002371941A (ja) * 2001-06-18 2002-12-26 Denso Corp 燃料噴射ポンプ
DE10129449A1 (de) * 2001-06-19 2003-01-02 Bosch Gmbh Robert Kraftstoffhochdruckpumpe für Brennkraftmaschine mit verbessertem Teillastverhalten
ITTO20010968A1 (it) * 2001-10-12 2003-04-12 C R F Societa Con Sortile Per Dispositivo di collegamento a tenuta di un raccordo su un iniettore di combustibile per motori endotermici.
DE10154645A1 (de) * 2001-11-07 2003-06-12 Siemens Ag Verfahren zum Herstellen einer Kraftstoffspeicherleitung mit einem vorgespannten Anschlussstück
DE10228551A1 (de) * 2002-06-26 2004-01-22 Siemens Ag Radialkolbenpumpe

Also Published As

Publication number Publication date
EP1704327A1 (fr) 2006-09-27
WO2005061890A1 (fr) 2005-07-07
DE502004004401D1 (de) 2007-08-30
DE10360534A1 (de) 2005-07-21
DE10360534B4 (de) 2007-06-06

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