WO2012076234A1 - Unité de dosage et élément filtrant - Google Patents

Unité de dosage et élément filtrant Download PDF

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Publication number
WO2012076234A1
WO2012076234A1 PCT/EP2011/068389 EP2011068389W WO2012076234A1 WO 2012076234 A1 WO2012076234 A1 WO 2012076234A1 EP 2011068389 W EP2011068389 W EP 2011068389W WO 2012076234 A1 WO2012076234 A1 WO 2012076234A1
Authority
WO
WIPO (PCT)
Prior art keywords
metering unit
filter element
sealing element
pressure pump
magnetic core
Prior art date
Application number
PCT/EP2011/068389
Other languages
German (de)
English (en)
Inventor
Francesco Lucarelli
Marco Lamm
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 WO2012076234A1 publication Critical patent/WO2012076234A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means

Definitions

  • the present invention relates to a metering unit for a high pressure pump of a fuel injection system, in particular a common rail system, an internal combustion engine according to the preamble of claim 1 and a filter element according to the preamble of claim 8.
  • a radial piston pump for a fuel injection system of an internal combustion engine which has a metering unit for flow control, which is arranged in a distributor element, is known from DE 10 2007 057 503 A1.
  • DE 198 01 355 B4 describes a high-pressure pump for generating high-pressure fuel in a common-rail injection system, in which an additional unit for the total fuel flow is integrated, which ensures that only a preselected flow in the high pressure pump is pressurized.
  • the suction-side flow control in the low-pressure region of the high pressure pump via an electro-magnetically controlled valve of the metering unit.
  • the known from the prior art metering units of diesel fuel flows through, wherein it varies this flow rate by the electrically controlled adjustment of a metering unit-internal sliding element, the so-called valve piston.
  • the metering unit must also seal outwards and also inwards against the housing, the low-pressure unit or the flange. Such a seal has hitherto been carried out in the prior art via inward, which are arranged in correspondingly made in the magnetic core annular grooves.
  • a filter element for protection against particles from the low pressure circuit can be arranged over the inlet bores of the magnetic core of the solenoid valve of the metering unit.
  • the filter element and the O-rings are mounted as separate components separately in single steps, which brings a corresponding assembly time with it.
  • the annular grooves, in which the O-rings are inserted, held on the one hand and on the other hand also be mechanically introduced into the magnetic core, which requires both space and working time. Another problem with this known from the prior art configuration that the inner O-ring can be crushed or pre-damaged inappropriate assembly.
  • a metering unit for a high-pressure pump of a fuel injection system of an internal combustion engine in particular of a common rail system, which comprises a solenoid valve which has a magnetic core provided with at least one inlet bore, in the region of the at least one inlet bore on an outer periphery of the magnetic core, a filter element is arranged, wherein at least one sealing element is formed integrally with the filter element.
  • the configuration according to the invention is that a hydraulic bypass can be avoided. Also, the magnetic core can be dimensioned smaller and executed at its lower end, since no O-ring groove must be introduced more. This in turn means a saving of material and a reduction of the processing effort. Finally, the combined filter-seal element configuration of the invention is also less sensitive to chips or particles entering during the assembly process of the metering unit. According to a preferred embodiment, the sealing element is a
  • Elastomeric seal which is directly connected to the filter element or molded directly thereto.
  • the filter element is formed radially.
  • the at least one sealing element comprises an internal first sealing element, which is formed radially on a first end portion of the filter element.
  • the first sealing element is provided with a Zentrierfase.
  • the provision of the centering bevel on the first sealing element avoids an oblique attachment during assembly. This significantly reduces the risk of pre-existing damage.
  • the metering unit can also be formed with an external second sealing element on the filter element, which is formed axially on a second end portion of the filter element.
  • the solenoid valve is a proportional valve.
  • the metering unit can be attached to the high-pressure pump, in particular screwed.
  • a filter element for a metering unit for a high-pressure pump of a fuel injection system, in particular a common-rail system, an internal combustion engine wherein at least one sealing element is formed integrally with the filter element.
  • the filter element which is formed as a unit with the sealing element, sees the advantages of a significant material, Montagezeit- and thus cost reduction with it.
  • Fig. 1 is a schematic representation of a fuel injection system according to the prior art
  • Fig. 2 is an exploded view of a metering unit according to the prior art
  • FIG. 3 is a sectional view through the prior art metering unit shown in FIG. 2; FIG.
  • FIG. 4 is an enlarged view of the lower portion of the prior art metering unit shown in FIG. 3;
  • FIG. 5 shows a perspective side view of a filter element according to an embodiment
  • FIG. 6 is a perspective side view of another filter element according to one embodiment.
  • Fig. 1 is a schematic representation of a fuel injection system 1 according to the prior art shown.
  • fuel is conveyed to a high-pressure pump 5 by means of a fuel pump 3 via a fuel line 4, which is designed here as a radial piston pump.
  • the fuel injection system 1 further comprises a metering unit 6 and a high-pressure accumulator 7, which is also referred to as a rail, which in turn is connected to injection valves, not shown here, which inject fuel into a likewise not shown combustion chamber of an internal combustion engine.
  • the metering unit 6 serves to variably adjust the inflow of fuel from the fuel delivery pump 3 to the high-pressure pump 5 as needed.
  • an overflow valve 8 is arranged which serves to deliver fuel that has been pumped too much from the fuel delivery pump 3, which can not reach the high-pressure pump 5 when the metering unit 6 is completely or partially closed. to steer and due to the return line 9 in the fuel tank 2.
  • the fuel delivery pump 3, the metering unit 6 and the overflow valve 8 are assigned to a low-pressure circuit of the fuel injection system 1.
  • Fig. 2 shows an exploded view of a metering unit 6 according to the prior art.
  • the metering unit 6 has an attached in a magnetic housing 1 1 Ordnetes solenoid valve 10, of which here the magnetic core 18 and the therein recordable or in the magnetic core 18 back and forth movable valve piston 19 are visible.
  • On the magnetic core 18, three O-rings 26 are arranged for sealing the metering unit 6 outwardly and inwardly.
  • a filter element 22 is shown, which is arranged in the assembled state of the metering unit 6 via inlet bores 23 which are provided in the magnetic core 18 to protect particles from the low-pressure circuit, for example paraffin, before entering the metering unit 6.
  • Fig. 3 is a sectional view through the metering unit 6 shown in FIG. 2 according to the prior art is shown, which has a variable speed solenoid valve 10, which a fuel inlet side or suction-side flow control of Kraftstoffzuf ü h ng to a high-pressure pump (see Fig. 1), to which the metering unit 6 is attachable, performs.
  • the solenoid valve 10 is disposed in the magnet housing 1 1.
  • a plug 12 is also housed with an electrical interface, via which the solenoid valve 10 can be supplied with power.
  • Solenoid valve 10 adjusts the amount of fuel delivered to a high pressure accumulator (see FIG. 1) of the fuel injection system to the power demand of the fuel injection system.
  • the solenoid valve 10 has a bearing 13, an armature 14 with plunger, a winding with bobbin 15, a pot 16, a residual air gap disk 17 and a magnetic core 18. Furthermore, below the armature 14, a valve piston 19 with control slots, which is surrounded by a spring 20, arranged.
  • the metering unit 6 is sealed by means of a plurality of O-rings 21. Furthermore, the filter element 22 is disposed on the outer circumference of the magnetic core 18, so that the inlet bores (see FIG. 2) are covered by the filter element 22.
  • the control of the solenoid valve 2 is done by means of a PWM signal (pulse width modulated signal).
  • FIG. 4 is an enlarged view of the lower portion of the prior art metering unit 6 shown in FIG.
  • FIG. 3 With the enlarged portion of FIG. 3 framed by a rectangle in FIG.
  • the potential for savings of material in the region of the magnetic core 18 is indicated by the region designated by the reference numeral 25, if the configuration according to the invention, which in connection with FIG and Fig. 6 is described in more detail, instead of the separate filter element 22 and the O inge 21 is used.
  • FIG. 5 is a side perspective view of a filter element 22 according to one embodiment.
  • the filter element 22 is integrally formed with two seal members 26, 26 '.
  • the filter element 22 and the sealing elements 26 are made of an elastomer.
  • one of the two sealing elements 26, 26 ' is designed as an internal first sealing element 26, which protrudes radially from this at a first end portion 24 of the filter element 22.
  • the first sealing element 26 is provided with a centering bevel 27.
  • the other of the two sealing elements 26, 26 ' is formed as an external second sealing element 26', which protrudes from the second end portion 28 in the axial direction.
  • the internal first seal member 26 seals the metering unit 6 (see FIG. 2) inwardly, whereas the external second seal member 26 'seals the metering unit 6 to the outside.
  • FIG. 6 is a side perspective view of another filter element 22 according to one embodiment.
  • one sealing element namely the internal first sealing element 26 is formed integrally with the filter element 22.
  • the external second sealing element 26 'must be provided in this embodiment as a separate second component.
  • a metering unit 6 is provided by the configuration according to the invention, in which by a reduction of the components a significant material, component, assembly time and thus cost reduction can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une unité de dosage (6) pour une pompe haute pression (5) d'un système d'injection de carburant (1), en particulier d'un système d'injection à rampe commune, d'un moteur à combustion interne, qui comprend une électrovanne (10) qui présente un noyau magnétique (18) muni d'au moins un orifice d'entrée (23). Dans la région de l'au moins un orifice d'entrée (23), au niveau d'une périphérie extérieure du noyau magnétique (18), est disposé un élément filtrant (22), au moins un élément d'étanchéité (26, 26') étant réalisé d'une seule pièce avec l'élément filtrant (22). L'invention concerne en outre un élément filtrant (22) pour une unité de dosage (6) pour une pompe haute pression (5) d'un système d'injection de carburant (1), notamment d'un système d'injection à rampe commune, d'un moteur à combustion interne, au moins un élément d'étanchéité (26, 26') étant réalisé d'une seule pièce avec l'élément filtrant (22).
PCT/EP2011/068389 2010-12-06 2011-10-21 Unité de dosage et élément filtrant WO2012076234A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010062455 DE102010062455A1 (de) 2010-12-06 2010-12-06 Zumesseinheit und Filterelement
DE102010062455.1 2010-12-06

Publications (1)

Publication Number Publication Date
WO2012076234A1 true WO2012076234A1 (fr) 2012-06-14

Family

ID=44872318

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/068389 WO2012076234A1 (fr) 2010-12-06 2011-10-21 Unité de dosage et élément filtrant

Country Status (2)

Country Link
DE (1) DE102010062455A1 (fr)
WO (1) WO2012076234A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013216982A1 (de) 2013-08-27 2015-03-05 Robert Bosch Gmbh Zumesseinheit
DE102013216988A1 (de) 2013-08-27 2015-03-05 Robert Bosch Gmbh Zumesseinheit
DE102013216986A1 (de) 2013-08-27 2015-03-19 Robert Bosch Gmbh Zumesseinheit
DE102013224395A1 (de) 2013-11-28 2015-05-28 Robert Bosch Gmbh Magnetventil
DE102014211942A1 (de) 2014-06-23 2015-12-24 Robert Bosch Gmbh Mengenproportionalventil mit beheizbarem Filterelement
DE102014217625B4 (de) * 2014-09-03 2020-01-16 Continental Automotive Gmbh Kraftstoffhochdruckpumpe
DE102014221342A1 (de) 2014-10-21 2016-04-21 Robert Bosch Gmbh Kraftstoffhochdruckpumpe mit einem elektromagnetisch betätigbaren Proportionalventil
DE102015212145A1 (de) * 2015-06-30 2017-01-05 Robert Bosch Gmbh Hochdruckpumpe mit integriertem Saugventil
IT201600123942A1 (it) * 2016-12-06 2018-06-06 Bosch Gmbh Robert Gruppo e metodo per disintasare un filtro di un gruppo di pompaggio di gasolio ad un motore a combustione interna
IT201600123932A1 (it) 2016-12-06 2018-06-06 Bosch Gmbh Robert Apparato e metodo per disintasare un filtro di un gruppo di pompaggio di gasolio ad un motore a combustione interna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326443A (en) * 1997-06-17 1998-12-23 Bosch Gmbh Robert A quantity regulating valve having a control slide valve for a fuel injection system
EP1126162A2 (fr) * 2000-02-15 2001-08-22 Robert Bosch Gmbh Soupape électromagnétique pour la régulation de la pression de combustible d'un moteur à combustion interne
DE19801355B4 (de) 1998-01-16 2004-04-08 Robert Bosch Gmbh Hochdruckpumpe zur Kraftstoffversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
DE102007057503A1 (de) 2007-11-29 2009-06-04 Robert Bosch Gmbh Radialkolbenpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine
DE102009002522A1 (de) * 2009-04-21 2010-10-28 Robert Bosch Gmbh Zumesseinheit mit integriertem Filter für eine Kraftstoff-Hochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326443A (en) * 1997-06-17 1998-12-23 Bosch Gmbh Robert A quantity regulating valve having a control slide valve for a fuel injection system
DE19801355B4 (de) 1998-01-16 2004-04-08 Robert Bosch Gmbh Hochdruckpumpe zur Kraftstoffversorgung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
EP1126162A2 (fr) * 2000-02-15 2001-08-22 Robert Bosch Gmbh Soupape électromagnétique pour la régulation de la pression de combustible d'un moteur à combustion interne
DE102007057503A1 (de) 2007-11-29 2009-06-04 Robert Bosch Gmbh Radialkolbenpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine
DE102009002522A1 (de) * 2009-04-21 2010-10-28 Robert Bosch Gmbh Zumesseinheit mit integriertem Filter für eine Kraftstoff-Hochdruckpumpe

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