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EP2676032A1 - Pompe haute pression pour un dispositif d'injection de carburant - Google Patents

Pompe haute pression pour un dispositif d'injection de carburant

Info

Publication number
EP2676032A1
EP2676032A1 EP12700166.7A EP12700166A EP2676032A1 EP 2676032 A1 EP2676032 A1 EP 2676032A1 EP 12700166 A EP12700166 A EP 12700166A EP 2676032 A1 EP2676032 A1 EP 2676032A1
Authority
EP
European Patent Office
Prior art keywords
pump
metering unit
pressure pump
fuel
pressure
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.)
Withdrawn
Application number
EP12700166.7A
Other languages
German (de)
English (en)
Inventor
Sascha Ambrock
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 EP2676032A1 publication Critical patent/EP2676032A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • 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
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141—Details or component parts
    • F04B1/145—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
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2064—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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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 pump for a fuel injection device of an internal combustion engine, comprising a high-pressure pump housing with a Pumpeninnen nenraum into which opens a feed for fuel, and a metering unit for metering fuel into a pump working space, wherein the metering unit is connected to the pump interior.
  • Such a high-pressure pump is known from DE 10 2008 043 444 A1.
  • This high-pressure pump is designed in particular for a common-rail injection system and has a prefeed pump designed as a piston pump.
  • the provision of the prefeed pump as a piston pump allows a significant cost advantage in terms of manufacturing costs compared to gear pumps or vane pumps, since a piston pump is comparatively simple in construction and easy to manufacture.
  • a metering unit for metering fuel into two pump working spaces is connected to the pump interior via a space connection.
  • This high-pressure pump has a pump housing which has an inlet and a drain for fuel in the region of a cylinder head.
  • the inlet is connected via a supply line with a metering unit, wherein the supply line opens radially into the metering unit.
  • the metering unit is further arranged directly above a pump working space and connected with this via a channel with an inserted Setzventil.
  • the invention has for its object to provide a high-pressure pump for a fuel ei n- injection device, which has an increase in pressure by reducing pressure loss. Disclosure of the Invention Advantages of the Invention
  • This object is achieved in that in the high-pressure pump housing a the pump interior directly connected to the metering unit flow connection is recessed.
  • This embodiment has the advantage that previous complicated and different deflections having connection holes can be avoided. These previous connection bores cause a considerable pressure loss or throttling effect due to different flow deflections. The fact that now a flow connection is created without deflections, the pressure loss is minimized, which allows better efficiency, better filling and higher delivery of the high-pressure pump. Furthermore, a cost reduction in the production of the high-pressure pump is achieved by the direct flow connection.
  • the flow connection is a bore which, in a further embodiment, in turn connects the pump interior directly to an inlet in the metering unit.
  • the bore is thus arranged so that the inlet is connected to the metering unit without any impairment by, for example, a deflection with the pump interior.
  • the pump interior is fuel-filled at the high-pressure pump, wherein the fuel is supplied via an inlet, which is connected to a fuel low-pressure system.
  • the location of the bore makes it possible to ensure better mixing of the fuel introduced into the interior of the pump, since the inlet and a drain are not directly adjacent to one another. As a result, short-circuit currents of fuel are avoided.
  • This embodiment ensures better cooling of the high pressure pump, which also contributes to an increase in efficiency.
  • the bore is arranged in extension of a receiving recess for the metering unit in the high-pressure pump housing.
  • This embodiment provides in a particularly simple form the direct flow connection between the metering unit and the pump interior.
  • the diameter of the bore corresponds at least approximately to the diameter of the inlet in the metering unit.
  • the inlet of the metering unit is connected via a metering valve with a Zumessauslass and the axial inlet flow is deflected into a radial outlet flow.
  • a metering valve with a Zumessauslass and the axial inlet flow is deflected into a radial outlet flow.
  • the Zumessauslass is connected via a suction valve on a direct route to the pump working space. This embodiment also reduces the pressure loss and achieves better filling of the pump working space with fuel.
  • Fig. 1 is a schematic circuit diagram of a fuel injection device with
  • FIG. 2 is a detailed sectional view of Figure 1 of the pump interior directly connected to the metering unit flow connection,
  • FIG. 3 shows a side view of a pump housing with an illustration of an inlet and a drain for fuel in the pump interior, a receiving recess for a metering unit and a bore for connecting the receiving recess to the pump interior, and FIG
  • FIG. 3 is a plan view of the high-pressure pump according to FIG. 3.
  • a common rail fuel injection device for an internal combustion engine to a fuel tank 1 is sucked from the fuel by an electric fuel pump see 2 and is passed through a filter 3 and an inlet 4 in the pump interior 5 of a high-pressure pump.
  • the high-pressure pump has a pump housing 6 enclosing the pump interior 5, in which a pump camshaft 7 is rotatably mounted.
  • Cams 8a, 8b of the pump camshaft 7 are arranged in the pump interior 5 and cooperate with roller tappets 9 of two high-pressure pump elements 10.
  • the high-pressure pump elements 10 each have a cooperating with the roller tappet 9 pump plunger, which is moved in a rotational movement of the pump camshaft 7 translationally up and down.
  • the respective pump plunger defines a pump working space 11 to which fuel is supplied via a metering unit 12 and a suction valve 24 shown in FIG.
  • the fuel is supplied to the metering unit 12 from the pump interior 5 via a filter, wherein the supply in the illustration of FIG. 1 for drawing technical reasons is not done directly.
  • an overflow valve 13 is also connected via a filter to the pump interior 5, via which fuel not forwarded by the metering unit 12 into the pump working spaces 11 is returned to the fuel tank 1 through a return line.
  • This return line is further connected to a housing bearing 14 and a flange bearing 15 of the high-pressure pump, wherein the housing bearing 14 and the flange bearing 15 represent the storage of the pump camshaft 7.
  • the housing bearing 14 and the flange bearing 15 are fuel lubricated, with the amount of fuel necessary for lubrication after the flow through the housing bearing
  • the two pump work chambers 11 are connected via check valves 16 to a high pressure accumulator 17, in which the fuel is fed under a pressure of about 3,000 bar.
  • the high-pressure accumulator 17 is connected to a pressure control valve 8, via which the pressure in the high-pressure accumulator 17 is maintained at a permissible maximum pressure.
  • the high-pressure accumulator 17 is connected to fuel injectors 19 corresponding to the number of cylinders of the internal combustion engine, wherein the fuel! injectors 19 controlled to inject fuel into the working chambers of the internal combustion engine.
  • Fig. 2 shows in addition to the parts taken from Fig. 1 components, the direct flow connection between the pump interior 5 and an inlet 20 in the Metering unit 12 by a recessed into the pump housing 6 bore 21, which is shown in this figure for drawing technical reasons as an external channel.
  • the bore 21 produces an axial flow of the inlet 20 of the metering unit 12, wherein the axial flow is deflected by a metering valve 22 of the metering unit 12 in a radial outflow through a Zumessauslass 23.
  • the metering outlet 23 can be formed by a plurality of openings in the metering unit 12, wherein the openings open into an annular space surrounding the metering unit 12 in this area, which in turn are connected directly to the suction valves 24 of the high-pressure pump elements 10 or their pump working spaces 11 ,
  • Figures 3 and 4 show in two views the pump housing 6 in the unmounted state, wherein the inlet 4 and a drain 26 for fuel in the pump interior 5 is shown. Furthermore, a receiving recess 25 for mounting the metering unit 12 is shown, wherein the receiving recess 25 is connected via a arranged in extension of the receiving recess 25 bore 21 with the pump interior 5. Furthermore, the sequence 26 is connected to the arranged in the interior of the high pressure pump spill valve 13, while outside the pump housing 6, the external return line is connected to the tank 1. In particular, in the plan view of Fig. 4, the exact position of the inlet 4, the drain 26, the receiving recess 25 and the receiving recess 25 with the pump interior 5 connecting bore 21 can be seen. Furthermore, a Wnkel of 90 ° enclosing receiving openings 27 for the two high-pressure pump elements 10 can be seen.

Landscapes

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

Abstract

L'invention concerne une pompe haute pression pour un dispositif d'injection de carburant d'un moteur à combustion interne, comportant un carter de pompe (6) présentant une chambre intérieure de pompe (5) dans lequel aboutit une conduite d'amenée (4) de carburant, et une unité de dosage (12) pour doser du carburant dans une chambre de travail de pompe (11), l'unité de dosage (12) étant connectée à la chambre intérieure de pompe (5). Le rendement de la pompe haute pression pour un dispositif d'injection de carburant selon l'invention est amélioré par réduction des pertes de pression. A cet effet, une liaison fluidique reliant directement la chambre intérieure de pompe (5) à l'unité de dosage (12) est ménagée dans le carter de pompe (6).
EP12700166.7A 2011-02-15 2012-01-09 Pompe haute pression pour un dispositif d'injection de carburant Withdrawn EP2676032A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110004095 DE102011004095A1 (de) 2011-02-15 2011-02-15 Hochdruckpumpe für eine Kraftstoffspritzvorrichtung
PCT/EP2012/050224 WO2012110261A1 (fr) 2011-02-15 2012-01-09 Pompe haute pression pour un dispositif d'injection de carburant

Publications (1)

Publication Number Publication Date
EP2676032A1 true EP2676032A1 (fr) 2013-12-25

Family

ID=45470565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12700166.7A Withdrawn EP2676032A1 (fr) 2011-02-15 2012-01-09 Pompe haute pression pour un dispositif d'injection de carburant

Country Status (4)

Country Link
EP (1) EP2676032A1 (fr)
CN (1) CN103392069B (fr)
DE (1) DE102011004095A1 (fr)
WO (1) WO2012110261A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111148896B (zh) * 2017-09-29 2022-01-11 株式会社电装 高压泵

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3861852B2 (ja) * 2003-05-09 2006-12-27 株式会社デンソー 燃料供給ポンプ
US7387109B2 (en) * 2003-10-21 2008-06-17 Robert Bosch Gmbh High-pressure fuel pump for an internal combustion engine
CN100473821C (zh) * 2005-03-30 2009-04-01 株式会社电装 具有柱塞的燃油泵及使用这种燃油泵的燃油供应系统
JP4453028B2 (ja) * 2005-03-30 2010-04-21 株式会社デンソー 高圧燃料ポンプ
DE102008064914B3 (de) * 2007-03-29 2022-02-17 Denso Corporation Hydraulische Pumpe
JP4318730B2 (ja) * 2007-03-29 2009-08-26 株式会社デンソー 高圧燃料ポンプ
DE102008043444A1 (de) 2008-11-04 2010-05-06 Robert Bosch Gmbh Pumpenanordnung
DE102009001560A1 (de) 2009-03-16 2010-09-23 Robert Bosch Gmbh Hochdruckpumpe

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2012110261A1 *

Also Published As

Publication number Publication date
CN103392069A (zh) 2013-11-13
CN103392069B (zh) 2017-01-18
DE102011004095A1 (de) 2012-08-16
WO2012110261A1 (fr) 2012-08-23

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