WO2011072913A2 - Dispositif anti-cavitation sur le cylindre de pompe d'une pompe haute pression - Google Patents

Dispositif anti-cavitation sur le cylindre de pompe d'une pompe haute pression Download PDF

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Publication number
WO2011072913A2
WO2011072913A2 PCT/EP2010/065776 EP2010065776W WO2011072913A2 WO 2011072913 A2 WO2011072913 A2 WO 2011072913A2 EP 2010065776 W EP2010065776 W EP 2010065776W WO 2011072913 A2 WO2011072913 A2 WO 2011072913A2
Authority
WO
WIPO (PCT)
Prior art keywords
pump
plunger
pump cylinder
pressure pump
druckabführspalt
Prior art date
Application number
PCT/EP2010/065776
Other languages
German (de)
English (en)
Other versions
WO2011072913A3 (fr
Inventor
Marcus Kristen
Friedrich Boecking
Andreas Dutt
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 WO2011072913A2 publication Critical patent/WO2011072913A2/fr
Publication of WO2011072913A3 publication Critical patent/WO2011072913A3/fr

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
    • F04B1/0408—Pistons
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F04B1/0421—Cylinders
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement

Definitions

  • the invention relates to a high-pressure pump for the fuel injection system of an internal combustion engine, with a pump housing in which at least one in a pump cylinder axially movable plunger between a bottom dead center position (UT position) and a top dead center position (TDC position) is movable.
  • UT position bottom dead center position
  • TDC position top dead center position
  • Such a high-pressure pump is known from DE 10 2005 027 851 A1.
  • This high-pressure pump is designed so that its pump housing and the bearings of the drive shaft are forcibly traversed by fuel.
  • the mechanical and thermal load capacity of the bearing and thus the entire high-pressure pump is significantly increased.
  • the cavitation inclination is further reduced in the interior of the pump housing.
  • the formation of vapor bubbles and local overheating is effectively prevented.
  • This configuration makes it possible to dispense with an otherwise common lubricant throttle between a prefeed pump and the pump housing, so that this high-pressure pump is constructed simpler than conventional high-pressure pumps despite the advantages mentioned.
  • the object of the invention is to provide a high-pressure pump for the fuel injection system of an internal combustion engine, in which cavitation erosion in the region of a pump cylinder is avoided. Disclosure of the invention
  • cavitation bubbles can form in the gap between the plunger and the pump cylinder, and as a result cavitation erosion damage can result in the implosion of the cavitation bubbles.
  • cavitation bubbles of this type can not arise because the nip, in the region of which the cavitation bubbles arise, is connected to a pressure discharge gap. This excludes the possibility of cavitation erosion damage.
  • an upper and a lower nip are present, which are connected to at least one Druckab Maschinenp. This Druckab Maschinenspalt then extends over the entire area between the upper and the lower nip.
  • the upper and the lower nip are each connected to an associated Druckab Maschinent. This embodiment makes it possible to maximize the guide surface of the plunger in the pump cylinder, since only in the area of both squish gaps there is a respective pressure discharge gap.
  • the upper and lower Druckabriosspalt are connected to each other via a Ausretesnut. This connection allows for volume balance between the upper and lower Druckab Maschinent.
  • the at least one Druckabriosspalt is connected via a flushing bore with a spring interior. This embodiment also achieves volume compensation in the corresponding region of the high-pressure pump.
  • the at least one DruckabAvemspalt is embedded in the plunger.
  • the wear behavior of the pump cylinder is not affected in the lateral force support.
  • the invention is applicable to a high-pressure pump with a transverse force-compensating tappet.
  • the inventive design is used in high pressure pumps in conjunction with a common rail system.
  • rail pressures are realized up to about 3000bar and therefore the mechanical loads of the high-pressure pump is particularly high.
  • the high pressure pump may further include one or more plunger pump cylinder units integrated with a pump housing and actuated by a common camshaft.
  • the high-pressure pump according to the invention is used especially in cross-country skiers.
  • FIG. 1 shows a section through a first variant of an inventively designed high-pressure pump
  • 2a, 2b each show a section through an inventively designed high pressure pump in a second embodiment, wherein different plunger positions are shown
  • Figure 3 shows a plunger, with a recessed Druckab thoroughlyspalt
  • Figure 4 shows a plunger with two recessed Druckabloomspalten.
  • the high-pressure pump shown in Figure 1 (and the other figures) has a pump housing 1, in which a camshaft 2 is rotatably mounted.
  • the camshaft 2 has two opposed cams 3a, 3b.
  • the camshaft is suitably from a shaft, for example, the crankshaft of a
  • the high pressure pump is used to promote fuel, especially diesel fuel in a high-pressure accumulator equipped with a common rail Einspritzsytem auto-ignition internal combustion engine.
  • the fuel is supplied to the high-pressure pump from a fuel tank controlled by a prefeed pump via a metering unit and a shut-off valve.
  • High-pressure accumulator the fuel is taken from injectors, which inject the fuel into the combustion chambers of the internal combustion engine.
  • the fuel pressure in the high-pressure accumulator is up to 3000 bar.
  • At least one pump cylinder 4 is connected to the pump housing 1 of the high pressure pump, in which a plunger 5 is guided axially displaceable.
  • the plunger 5 is camshaft side connected to a roller 7 carrying roller carrier body 6. During a rotational movement of the camshaft 2, the roller 7 rolls onto the latter or the cams 3a, 3b and converts the rotational movement of the camshaft
  • the plunger 5 passes the transverse forces from the roller 7 in the pump housing 1 and the pump cylinder 4 and the plunger 5 is pressed on one side to the pump cylinder 4.
  • the plunger 5 is on the side facing away from the camshaft 2 side with a
  • Pump piston 8 is connected, in turn, in a high-pressure pump cylinder. 9 is movable.
  • the high-pressure pump cylinder 9, the fuel to be compressed is supplied via, for example, a backing pump and conveyed by the pump piston 8 via a line in the high-pressure accumulator of the common rail injection system.
  • the pump piston is pressed against the plunger 5 and the roller carrier body 6 by a compression spring, not shown in the drawing, which is arranged in the annular space surrounding the high-pressure pump cylinder. This ensures that the roller 7 always unwinding on the camshaft 2 and the cam 2 a, 2 b rolls.
  • the plunger 5 takes between the UT position and TDC position in particular two (in particular in the region of maximum power transmission between the camshaft 2 and the plunger 5 located) positions, each a tilting movement of the plunger 5 to different Attachment sides (see also Figures 2a and 2b) on the pump cylinder 4 effect.
  • These tilting movements of the plunger 5 lead to the formation of an upper nip 10a and a lower nip 10b, wherein at these points - also caused by pressure fluctuations of the lubrication of the components between the plunger 5 and the pump cylinder fuel - the possibility of occurrence of KavitationserosionsJden particularly pronounced is.
  • a Druckab fertilspalt 1 1 is present, which is embedded in the pump cylinder 4 and the pump housing 1.
  • Such a Druckabriosspalt 1 1 can of course also be arranged in the region of the upper nip 10 a (not shown in the figure).
  • FIGS. 2a, 2b the two positions of the camshaft 2 are shown, in which the two different tilting movements of the plunger 5 are executed and specified the zones in which adjust the squish gaps 10a, 10b, which can lead to the described Kavitationserosions2020.
  • the UT and TDC positions are respectively indicated on the camshaft 2 and the cam 3 a, in which the tappet 5 cooperates with the camshaft 2 in each case in its UT position or TDC position.
  • the diameter D of the pump cylinder 4 and the diameter d of the plunger 5 is defined.
  • FIGS. 2 a, 2 b do not show any pressure discharge gaps, these are represented in the associated FIGS. 3 and 4 in two variants, wherein both variants have the common feature that the respective pressure discharge gap is embedded in the plunger 5.
  • FIG 3 shows a plunger 5, in which a continuous Druckab Maschinenspalt 1 1 a is inserted, which extends between the nips 10a to 10b according to Figures 2a, 2b.
  • the Druckab Maschinenspalt 1 1 a is connected via a flushing bore 12 with an interior of the plunger 5.

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 le système d'injection de carburant d'un moteur à combustion interne, ladite pompe comprenant un carter de pompe (1) dans lequel au moins un poussoir (5) axialement mobile dans un cylindre de pompe (4) peut se déplacer entre une position de point mort inférieure (position UT) et une position de point mort supérieure (position OT). L'invention vise à mettre au point une pompe haute pression pour le système d'injection de carburant d'un moteur à combustion interne qui permette d'éviter une érosion par cavitation dans la zone d'un cylindre de pompe (4). A cet effet, un film fluidique est formé entre le poussoir (5) et le cylindre de pompe (4), le poussoir (5) occupant entre la position UT et la position OT au moins une position réalisant un mouvement basculant et la fente de serrage (10) provoquée par le mouvement basculant étant reliée à une fente d'évacuation de pression (11). Selon une variante, le jeu entre le poussoir (5) et le cylindre de pompe (4) est limité à une valeur de 2/1000 x D (D = diamètre du cylindre de pompe). Cette limitation du jeu permet de réduire au minimum le mouvement basculant de telle sorte que presque aucune bulle de vapeur ne puisse être produite.
PCT/EP2010/065776 2009-12-18 2010-10-20 Dispositif anti-cavitation sur le cylindre de pompe d'une pompe haute pression WO2011072913A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910054944 DE102009054944A1 (de) 2009-12-18 2009-12-18 Kavitationsvermeidung am Pumpenzylinder einer Hochdruckpumpe
DE102009054944.7 2009-12-18

Publications (2)

Publication Number Publication Date
WO2011072913A2 true WO2011072913A2 (fr) 2011-06-23
WO2011072913A3 WO2011072913A3 (fr) 2011-09-01

Family

ID=44047401

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/065776 WO2011072913A2 (fr) 2009-12-18 2010-10-20 Dispositif anti-cavitation sur le cylindre de pompe d'une pompe haute pression

Country Status (2)

Country Link
DE (1) DE102009054944A1 (fr)
WO (1) WO2011072913A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012152497A1 (fr) * 2011-05-09 2012-11-15 Robert Bosch Gmbh Ensemble poussoir pour pompe haute pression et pompe haute pression
WO2012156137A1 (fr) * 2011-05-18 2012-11-22 Robert Bosch Gmbh Pompe à piston
GB2543354A (en) * 2015-10-16 2017-04-19 Gm Global Tech Operations Llc Roller tappet for a fuel unit pump of an internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015221289A1 (de) 2015-10-30 2017-05-04 Robert Bosch Gmbh Hochdruckpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027851A1 (de) 2005-06-16 2006-12-21 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5775203A (en) * 1997-01-28 1998-07-07 Cummins Engine Company, Inc. High pressure fuel pump assembly
GB2366336A (en) * 2000-08-31 2002-03-06 Delphi Tech Inc Fuel pump
DE10215038A1 (de) * 2002-04-05 2003-10-23 Bosch Gmbh Robert Fluidpumpe
DE102007032218A1 (de) * 2007-07-11 2009-01-15 Robert Bosch Gmbh Radialkolbenpumpe für ein Kraftstoffeinspritzsystem
DE102008010286A1 (de) * 2008-02-21 2009-08-27 Robert Bosch Gmbh Kolbenpumpe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027851A1 (de) 2005-06-16 2006-12-21 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012152497A1 (fr) * 2011-05-09 2012-11-15 Robert Bosch Gmbh Ensemble poussoir pour pompe haute pression et pompe haute pression
WO2012156137A1 (fr) * 2011-05-18 2012-11-22 Robert Bosch Gmbh Pompe à piston
GB2543354A (en) * 2015-10-16 2017-04-19 Gm Global Tech Operations Llc Roller tappet for a fuel unit pump of an internal combustion engine
US10024200B2 (en) 2015-10-16 2018-07-17 GM Global Technology Operations LLC Roller tappet for a fuel unit pump of an internal combustion engine

Also Published As

Publication number Publication date
DE102009054944A1 (de) 2011-06-22
WO2011072913A3 (fr) 2011-09-01

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