EP2187037A1 - Unité de mesure de carburant pour une pompe à carburant - Google Patents

Unité de mesure de carburant pour une pompe à carburant Download PDF

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Publication number
EP2187037A1
EP2187037A1 EP09173591A EP09173591A EP2187037A1 EP 2187037 A1 EP2187037 A1 EP 2187037A1 EP 09173591 A EP09173591 A EP 09173591A EP 09173591 A EP09173591 A EP 09173591A EP 2187037 A1 EP2187037 A1 EP 2187037A1
Authority
EP
European Patent Office
Prior art keywords
metering unit
bearing bush
fuel metering
fuel
anchor bolt
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
EP09173591A
Other languages
German (de)
English (en)
Other versions
EP2187037B1 (fr
Inventor
Steffen Wieland
Marion Schieber-Stitz
Tobias Landenberger
Tilman Miehle
Jochen Wessner
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 EP2187037A1 publication Critical patent/EP2187037A1/fr
Application granted granted Critical
Publication of EP2187037B1 publication Critical patent/EP2187037B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing

Definitions

  • the invention relates to a fuel metering unit for a fuel pump in an internal combustion engine according to the preamble of claim 1. Furthermore, the subject of the invention is a fuel pump according to the preamble of the corresponding independent patent claim.
  • Such a fuel metering unit is characterized by the DE 10 2005 025 872 A1 known.
  • This fuel metering unit is used for suction side flow control of a fuel pump, which is part of a fuel injection device of an internal combustion engine.
  • the fuel metering unit has a control valve actuated by an electromagnet with a valve member, by means of which different flow cross sections can be set in the intake region of the high-pressure fuel pump. This regulates the flow rate of the fuel pump.
  • the electromagnet has an armature and a movable anchor bolt, through which the valve member is movable.
  • the anchor bolt is guided axially displaceably in at least one bearing bush.
  • This at least one bearing bush can be made of metal, for example. Of bronze, aluminum or copper or of a fuel and temperature-resistant plastic.
  • the object of the invention is to develop a fuel metering unit of the type mentioned in such a way that it has a better performance and an increased life.
  • the fuel metering unit should also be inexpensive.
  • pressure equalizing bores are, for example, provided in a bottom of a valve piston and / or in the armature of the fuel metering unit. According to the invention, these pressure compensation holes are at least partially integrated into the bearing bushes necessary for guiding the anchor bolt, in any case, by having an axial groove.
  • These bushings are preferably manufactured separately with high accuracy from an extruded profile to realize on the one hand a tight fit of the bearing bush in a valve housing and on the other hand, the best possible guidance for the anchor bolt.
  • one or more axial grooves can be provided on the bearing bush without additional production costs.
  • pressure compensation holes within the valve housing can thus be omitted at least partially. This makes the device according to the invention inexpensive.
  • the axial grooves can be arranged on an outer side or on an inner side of the bearing bush.
  • a single axial groove per bushing may be sufficient.
  • an additional advantage results when the axial grooves are dimensioned so that the contact surface between a bearing surface and the anchor bolt minimized and as a result, the frictional resistance is reduced. This also makes it possible to keep the inner bore of the bearing bush over the entire length constant.
  • the inside of the bearing bush is designed only partially cylindrical and this thus only partially acts as a bearing surface for the anchor bolt.
  • the inner diameter of the bearing bush is larger in regions than the inner diameter in the region of the bearing surface.
  • the area with the larger one Diameter can be arranged only on one side of the bearing bush. But it can also be arranged on both sides of the bearing bush, so that the actual bearing surface for the anchor bolt is located in the middle of the bearing bush.
  • the region of the bearing bush with a larger inner diameter can, for example, be conical or simply cylindrical with a larger diameter.
  • the bearing bush is made by forming material, in particular drawing or extrusion.
  • material in particular drawing or extrusion.
  • extrusion for example, is the ability to produce profiles with great precision, even in the most complicated shapes or in difficult-to-form materials.
  • the choice of the usable material is almost arbitrary.
  • the high degree of deformation achievable in one process step and the relatively low tool costs make the production process effective and cost-effective.
  • the bushing can also be made by drawing round stock by a die, which is also effective and inexpensive.
  • FIG. 1 a fuel metering unit according to the invention is shown in a longitudinal section. It is indicated in its entirety by the reference numeral 1.
  • the fuel metering unit 1 is disposed in the fuel flow between a prefeed pump and a high-pressure fuel pump of a fuel injector for an internal combustion engine, and serves to variably adjust the amount of fuel delivered by the high-pressure fuel pump.
  • a variable flow cross-section is set between the prefeed pump and the high-pressure fuel pump.
  • the fuel metering unit 1 is driven by an electronic control device (not shown) through which Operating parameters of the internal combustion engine are evaluated and depending on a required flow rate of the high-pressure fuel pump is determined.
  • the fuel metering unit 1 has an electromagnet 10 and a control valve 12 operated by it.
  • the essential components of the electromagnet 10 are a magnetic coil 14, an armature 16 with anchor bolt 18 and a magnet pot 20 which surrounds the magnetic coil 14 and the armature 16 partially.
  • Anchor bolt 18 and solenoid 14 may be made in one piece or as separate components.
  • the magnetic pot 20 is partially encapsulated in plastic, wherein on the encapsulation 21, a plug housing 22 is formed in which at least one electrical connection 24 is arranged for the magnetic coil 14.
  • the control valve 12 has a valve housing 30, which also serves as a magnetic core.
  • a longitudinal bore 32 is provided, in which a piston-shaped valve member 34 of the control valve 12 is guided displaceably.
  • the valve member 34 is cup-shaped and hollow, at the bottom 36 of the anchor bolt 18 abuts.
  • the valve member 34 is held by an arranged in this prestressed spring 38 in contact with the anchor bolt 18.
  • the spring 38 is supported on the one hand on the inside of the bottom 36 of the valve member 34 and on the other hand on an annular securing element 39 inserted into the longitudinal bore 32.
  • In the bottom 36 of the valve member 34 at least one, preferably a plurality of openings 37 are provided through which during the axial movement of the valve member 34 in the longitudinal bore 32 fuel can flow. Through the openings 37 is a pressure compensation (in FIG. 1 ) in the lower portion of the fuel metering unit 1 on both sides of the valve member 34 in the longitudinal bore 32 allows.
  • At least one, preferably a plurality of openings 40 are provided on the circumference of the valve housing 30 and are connected to a fuel inlet from the prefeed pump.
  • the openings 40 can open on the circumference of the longitudinal bore 32 in the valve housing 30 in a circumferential annular groove 42.
  • an annular filter 44 can be arranged in the region of the openings 40, by which it is prevented that contaminants can enter the control valve 12. The fuel flow from the control valve 12 to the high-pressure fuel pump out from the interior of the valve member 34 through the open, the electromagnet 10 side facing away from the valve housing 30 from the longitudinal bore 32 out.
  • the valve member 34 has in its periphery near its open end at least one, preferably a plurality of control openings 46, through which the size of the flow cross-section between the inlet and outlet of the control valve 12 is controlled during the axial movement of the valve member 34 in the longitudinal bore 32.
  • FIG. 1 the valve member 34 is shown in the left half in its fully open position and in the right half in its closed position. Between the armature 16 and the valve housing 30, a residual air gap disk 31 is arranged, by which it is prevented that the armature 16 comes to rest on the valve housing 30.
  • the anchor bolt 18 projects from the magnet pot 20 through an opening 50 in the valve housing 30 into the longitudinal bore 32.
  • the opening 50 can form a bearing point for the anchor bolt 18, in which it is guided in the direction of its longitudinal axis 19 slidably.
  • the anchor bolt 18 is displaceably guided in a bearing bush 52 in the direction of its longitudinal axis 19.
  • the bushing 52 is inserted into a hollow cylindrical receptacle 53 of the magnet pot 20, preferably pressed.
  • the fuel metering unit 1 has a cavity 54.
  • the bushing 52 is designed as a solid undivided component made of metal or a suitable plastic having a cylindrical outer shape and has an outer diameter D, on which the bearing bush 52 is pressed into the receptacle 53.
  • the bearing bush 52 On the inside, the bearing bush 52 has a cylindrical bearing surface 55 with a diameter d, in which the anchor bolt 18 is guided with little radial play.
  • the bushing 52 is made by forming, in particular drawing or extrusion.
  • the bearing surface 55 of the bushing 52 may be provided with a lubricious coating or a slid surface to improve the sliding properties and to achieve high wear resistance.
  • a groove 56 is arranged in the upper region of the plan view, which extends axially over the entire length of the bearing bush 52.
  • the axial groove 56 forms after pressing the bearing bush 52 into the receptacle 53 a cavity which serves for pressure equalization in the cavity 54 when moving the anchor bolt 18.
  • a plurality of axial grooves may also be arranged on the outer side (cf., reference numeral 56a) and / or on the inner side, that is, the bearing surface 55 (see reference numeral 56b). It should be noted that the axial grooves are evenly distributed over the circumference of the bearing bush to ensure accurate guidance of the anchor bolt 18.
  • a particularly economical embodiment of the bearing shell according to the invention provides that the axial grooves 56b are dimensioned so that the contact surface between the bearing surface 55 and anchor bolt 18 minimized and as a result, the frictional resistance is reduced. As a result, it is also possible to keep the inner bore 55 of the bearing bush 52 constant over the entire length and finish it during the forming process.
  • the inner diameter d and the outer diameter D and thus the wall thickness of the bearing bush 52 can be selected substantially arbitrarily. With the bearing bush 52 thus relatively large differences in diameter between the anchor bolt 18 and the recording of the bearing bush 52 in the magnet pot 20 can be compensated. This facilitates the production of the magnetic pot 20, since this must have a relatively large diameter in the region of the armature 16 and the adjoining receptacle for the bearing bush 52 in diameter only has to be made slightly smaller, since the difference in diameter to the anchor bolt 18 through the bearing bush 52 is compensated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP09173591A 2008-11-17 2009-10-21 Unité de mesure de carburant pour une pompe à carburant Active EP2187037B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008043798A DE102008043798A1 (de) 2008-11-17 2008-11-17 Kraftstoffzumesseinheit für eine Kraftstoffpumpe

Publications (2)

Publication Number Publication Date
EP2187037A1 true EP2187037A1 (fr) 2010-05-19
EP2187037B1 EP2187037B1 (fr) 2012-02-29

Family

ID=41682615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09173591A Active EP2187037B1 (fr) 2008-11-17 2009-10-21 Unité de mesure de carburant pour une pompe à carburant

Country Status (3)

Country Link
EP (1) EP2187037B1 (fr)
AT (1) ATE547619T1 (fr)
DE (1) DE102008043798A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011013702A1 (de) 2011-03-11 2012-09-13 Kendrion Binder Magnete Gmbh Elektromagnetischer Aktor
WO2015028279A1 (fr) * 2013-08-30 2015-03-05 Volkswagen Ag Actionneur électromagnétique à capacité de réglage améliorée
EP2873849A1 (fr) * 2013-11-18 2015-05-20 Robert Bosch Gmbh Vanne pour l'ajout de fluide
EP2944795A1 (fr) * 2014-05-15 2015-11-18 Hamilton Sundstrand Corporation Soupape doseuse de carburant et procédé de gestion d'une telle soupape
WO2016012143A1 (fr) * 2014-07-22 2016-01-28 Robert Bosch Gmbh Élément de commande électromagnétique d'une soupape d'aspiration et soupape d'aspiration
WO2016192889A1 (fr) * 2015-05-29 2016-12-08 Robert Bosch Gmbh Vanne à élément de purge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011004008A1 (de) 2011-02-11 2012-08-16 Robert Bosch Gmbh Zumesseinheit sowie Kraftstoffhochdruckpumpe mit einer solchen Zumesseinheit
CN103147891A (zh) * 2013-04-04 2013-06-12 无锡正大轴承机械制造有限公司 比例电磁阀用阀壳与活塞组合机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030089872A1 (en) * 2001-11-09 2003-05-15 Katsunori Furuta Flow amount control device
DE10241360A1 (de) * 2002-09-06 2004-03-18 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
WO2004027251A1 (fr) * 2002-09-12 2004-04-01 Robert Bosch Gmbh Unite de dosage de carburant conçue pour un dispositif d'injection de carburant
US20040261771A1 (en) * 2001-11-27 2004-12-30 Takeshi Ichinose Fluid flow rate control valve, anchor for mover and fuel injection system
DE102005025872A1 (de) 2005-06-06 2006-12-07 Robert Bosch Gmbh Kraftstoffzumesseinheit für eine Kraftstoffhochdruckpumpe und Kraftstoffhochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030089872A1 (en) * 2001-11-09 2003-05-15 Katsunori Furuta Flow amount control device
US20040261771A1 (en) * 2001-11-27 2004-12-30 Takeshi Ichinose Fluid flow rate control valve, anchor for mover and fuel injection system
DE10241360A1 (de) * 2002-09-06 2004-03-18 Siemens Ag Einspritzvorrichtung zum Einspritzen von Kraftstoff
WO2004027251A1 (fr) * 2002-09-12 2004-04-01 Robert Bosch Gmbh Unite de dosage de carburant conçue pour un dispositif d'injection de carburant
DE102005025872A1 (de) 2005-06-06 2006-12-07 Robert Bosch Gmbh Kraftstoffzumesseinheit für eine Kraftstoffhochdruckpumpe und Kraftstoffhochdruckpumpe

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103597557B (zh) * 2011-03-11 2016-06-22 肯德隆（菲林根）有限公司 电磁执行器
WO2012123086A1 (fr) 2011-03-11 2012-09-20 Kendrion Binder Magnete Gmbh Actionneur électromagnétique
DE102011013702A8 (de) * 2011-03-11 2013-02-28 Kendrion (Villingen) Gmbh Elektromagnetischer Aktor
CN103597557A (zh) * 2011-03-11 2014-02-19 肯德隆（菲林根）有限公司 电磁执行器
DE102011013702B4 (de) * 2011-03-11 2016-02-04 Kendrion (Villingen) Gmbh Elektromagnetischer Aktor
DE102011013702A1 (de) 2011-03-11 2012-09-13 Kendrion Binder Magnete Gmbh Elektromagnetischer Aktor
US9523437B2 (en) 2011-03-11 2016-12-20 Kendrion (Villingen) Gmbh Electromagnetic actuator
WO2015028279A1 (fr) * 2013-08-30 2015-03-05 Volkswagen Ag Actionneur électromagnétique à capacité de réglage améliorée
EP2873849A1 (fr) * 2013-11-18 2015-05-20 Robert Bosch Gmbh Vanne pour l'ajout de fluide
EP2944795A1 (fr) * 2014-05-15 2015-11-18 Hamilton Sundstrand Corporation Soupape doseuse de carburant et procédé de gestion d'une telle soupape
US9739203B2 (en) 2014-05-15 2017-08-22 Hamilton Sundstrand Corporation Fuel metering valve and method of managing fuel in a metering valve
WO2016012143A1 (fr) * 2014-07-22 2016-01-28 Robert Bosch Gmbh Élément de commande électromagnétique d'une soupape d'aspiration et soupape d'aspiration
WO2016192889A1 (fr) * 2015-05-29 2016-12-08 Robert Bosch Gmbh Vanne à élément de purge

Also Published As

Publication number Publication date
ATE547619T1 (de) 2012-03-15
EP2187037B1 (fr) 2012-02-29
DE102008043798A1 (de) 2010-05-20

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