EP0971123A2 - Pompe d'injection de carburant - Google Patents

Pompe d'injection de carburant Download PDF

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Publication number
EP0971123A2
EP0971123A2 EP99113205A EP99113205A EP0971123A2 EP 0971123 A2 EP0971123 A2 EP 0971123A2 EP 99113205 A EP99113205 A EP 99113205A EP 99113205 A EP99113205 A EP 99113205A EP 0971123 A2 EP0971123 A2 EP 0971123A2
Authority
EP
European Patent Office
Prior art keywords
control
fuel injection
bore
piston
cross
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
EP99113205A
Other languages
German (de)
English (en)
Other versions
EP0971123A3 (fr
EP0971123B1 (fr
Inventor
Rolf Prillwitz
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.)
LOrange GmbH
Original Assignee
LOrange 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 LOrange GmbH filed Critical LOrange GmbH
Publication of EP0971123A2 publication Critical patent/EP0971123A2/fr
Publication of EP0971123A3 publication Critical patent/EP0971123A3/fr
Application granted granted Critical
Publication of EP0971123B1 publication Critical patent/EP0971123B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge

Definitions

  • the invention relates to a fuel injection pump for an internal combustion engine according to the Preamble of claim 1.
  • a common fuel injection pump for an internal combustion engine contains one in one Pump cylinder guided pump piston and a limited by the pump piston Pressure chamber, as well as at least one control bore.
  • the pump piston has a upper control edge on the pressure chamber side and at least one lower, sloping one Control edge, which is the beginning and end of Determine the fuel delivery of the injection pump.
  • the pump piston has one in the pressurized piston head to one in the pressure chamber such a fuel injection pump is known for example from DE 4304084 C2.
  • the object of the invention is to provide a fuel injection pump for a Specify internal combustion engine in which the occurrence of cavitation is essential is reduced or even avoided entirely.
  • the fuel injection pump for an internal combustion engine comprises a pump piston guided in a pump cylinder and one from the pump piston limited pressure chamber, as well as at least one control bore, the pump piston an upper control edge on the pressure chamber side and at least one lower, oblique one Control edge, which begins by painting over the control bore (s) and Determine the end of the fuel delivery of the injection pump, with the pump piston one the pressurized piston head in the pressure chamber having.
  • the pump piston in the area of the lower control edge the pump piston is formed a pilot valve groove, which when sweeping the Control hole (s) earlier than the lower, sloping control edge means the control hole a termination of fuel delivery, and that one from the piston head to the Vorab horrnut leading flow connection is provided, which means for Has flow limitation.
  • a major advantage of the fuel injection pump according to the invention is that before the control edge of the pump piston sweeps over the control bore by means of the In advance control groove, there is a significant reduction in pressure in the pressure chamber and thus flow-forming flow processes in the area of the control edge and Control bore can be reduced.
  • Fuel injection pump is provided that the pilot valve groove essentially that Following the course of the lower, oblique control edge in the lateral surface of the Pump piston is formed.
  • the pre-tax groove is by spacing against the lower, oblique control edge sealed high pressure area.
  • the Piston head leading to the pilot valve groove through at least one is formed through the interior of the pump piston bore.
  • a particularly advantageous embodiment of this provides that the Flow connection at least one from the piston head in the axial direction into the interior of the pump piston and at least one bore in the radial direction of the pilot control groove running into the interior of the pump piston, the axial bore cutting hole includes.
  • An advantageous embodiment of the fuel pump according to the invention provides that the pump cylinder has two diametrically opposite control bores and the pump piston each has two diametrically opposite lower control edges and Pre-control grooves, and that the bores extending in the radial direction open diametrically opposite in the axial bore.
  • the diametrical arrangement of the Openings of the radial bores in the axial bore bring the advantageous Effect that the fuel flows entering the radial bores are directed in the opposite direction and thus as much pressure energy as possible is destroyed.
  • each pre-tax groove several radial bores are provided which are angularly offset from one another run, with two holes diametrically opposite each other at the same height in the axial bore open.
  • this leads to a splitting of the piston head fuel flows entering the pre-tax groove with the effect of a strong reduction of pressure energy, as well as the opposite occurring in the pre-tax grooves Fuel flows through which further energy degradation takes place.
  • two radial bores are provided for each pilot control groove each lead into the vicinity of the ends of the pre-tax grooves. This leads to two opposite currents in the pre-tax grooves, whose energies Remove each other from entering the control holes.
  • the means for limiting the flow are advantageously at least one Area of small cross-section of those running through the interior of the pump piston Holes formed.
  • the cross section of the axial bore is smaller than the sum of the cross sections of the radial bores opening into these.
  • the second cross section B is smaller than the first cross section A.
  • the first cross section A advantageously about twice the second cross section B.
  • the cross section of the radial bore is advantageously smaller or approximately small the cross-section of the pre-tax groove.
  • pilot valve groove has rounded edges on its sole with a radius R. having.
  • reference numeral 1 means the pump cylinder Fuel injection pump for an internal combustion engine, in particular a diesel engine.
  • a pump piston 2 is displaceably guided in the axial direction of the pump cylinder 1, which of a camshaft acting on a piston foot of the pump piston is cyclically driven.
  • the camshaft and piston foot are not shown in FIG. 1.
  • the Pump piston 2 is provided at its lower end with a piston vane 11, which in cooperation with, for example, a rack a twist around Piston axis over a predetermined angular range.
  • the pump piston 2 delimits on its upper side a pressure chamber 3 which is in the pump cylinder 1 is provided. At the top of the pressure chamber 3, an inlet channel 10 and open Drain channel 9 for the fuel.
  • Control bores 4a and 4b are provided laterally in the pump cylinder 1.
  • a that the upper end of the pump piston 2 forming piston head 5 is on a circumference with a upper, pressure chamber side control edge 6 and lower, oblique control edges 7a, 7b provided, of which only one control edge 7a is visible in Fig. 1.
  • the top control edge 6 and the lower control edge 7a together limit a connection of the Pressure chamber 3 with the underside of the lower, oblique control edge 7a, 7b producing Piston groove 8 is a control triangle, which by sweeping the control holes 4a, 4b Determines the start and end of fuel delivery for the injection pump.
  • Fuel injection pump are formed two such control triangles, each cooperate with the control bores 4a and 4b.
  • Fig. 1 and Fig. 2a) to c is in the range from the bottom Control edge 7a, 7b on the pump piston 2 a pilot valve groove 20a, 20b in the form of a the routing of the lower control edge 7a, 7b provided.
  • the Pre-control groove 20a, 20b is formed by a formed in the interior of the pump piston 2 Flow connection with the piston head 5 and thus with the pressure chamber in Connection.
  • the flow connection is through a in the center of the pump piston 2 running axial bore 23 and two for each pilot valve groove 7a, 7b provided radially extending bores 21a, 22a and 21b, 22b.
  • the upper side of the axial bore 23 is expanded by a cone 24.
  • the pilot control groove 20a, 20b sweeps when the pump piston moves upward 2 earlier during the delivery stroke of the injection pump, the respective control bore 4a, 4b than the lower, oblique control edge 7a, 7b, so that an earlier pressure relief of the Pressure chamber 3 via the bores 23 and 21a, 22a, 21b, 22b and the pilot valve grooves 20a, 20b in the sense of ending fuel delivery.
  • the cross section of the through the axial bore 23 and the radial bores 21a, 22a, 21b, 22b formed flow connection is selected so that a substantial degradation of the pressure energy stored in the printing space 3 takes place, so that in the final Pressure relief of the pressure chamber 3 via the lower control edge 7a, 7b no cavitation no longer occurs, but on the other hand, there is still no cavitation in the pilot control groove 20a, 20b occurs.
  • the pre-tax grooves 20a, 20b are against the one adjoining the lower control edge 7a, 7b High pressure area sealed by a distance S by spacing.
  • the radial bores 21a, 22a and 21b, 22b each open near the ends of the Pre-tax grooves 20a, 20b in this.
  • the radial Bores 21a, 22a and 21b, 22b angularly offset from one another and open each in pairs diametrically opposite each other in the axial bore 23. Die mutual position of the radial bores 21a, 22a and 21b, 22b is again in Fig. 3a) shown enlarged.
  • the axial bore 23 has between the mouths of the radial bores 21a, 21b and 22a, 22b a reduction in the cross section.
  • the cross sections of the axial bore 23 50 selected that the first cross section at the first radial bore 21a, 21b approximately is twice as large as the second cross section at the second radial bore 22a, 22b.
  • This reduction in the flow limiting in the axial bore 23 Cross section should be achieved that the flow from the pressure chamber 3 to the Pre-control grooves 20a, 20b approximately equal to the first radial bore 21a, 21b and the second radial bore 22a, 22b distributed.
  • the cross sections of the holes chosen so that the cross section of the axial bore 23 is smaller than the sum of the Cross sections of the radial bores 21a, 21b and 22a, 22b opening into these.
  • Fig. 3c shows a further enlarged section along the line A-B in Fig. 2c) in Pre-tax groove 20b.
  • the edges of the pre-control groove are on rounded their sole with a radius R, which on the one hand improves the Flow behavior within the pre-control groove 20a, 20b and the other Strength of the pump piston 2 in the area of the pre-control groove 20a, 20b and serves in particular the heavily loaded lower control edges 7a, 7b.
  • the Strength is the measure of the distance S between the pre-control groove 20a, 20b and lower control edge 7a, 7b of importance.
  • This dimension S is to be chosen so that on the one hand the beginning of the pre-control when the pre-control groove 20a, 20b arrives at the Control bore 4a, 4b in an appropriate relationship to the end of fuel delivery when the lower control edge 7a, 7b arrives at the control bore 4a, 4b and on the other hand, the occurrence of damage in this highly stressed area of the Pump piston 2 is reliably excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP99113205A 1998-07-10 1999-07-08 Pompe d'injection de carburant Expired - Lifetime EP0971123B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19831078A DE19831078A1 (de) 1998-07-10 1998-07-10 Kraftstoffeinspritzpumpe
DE19831078 1998-07-10

Publications (3)

Publication Number Publication Date
EP0971123A2 true EP0971123A2 (fr) 2000-01-12
EP0971123A3 EP0971123A3 (fr) 2001-04-18
EP0971123B1 EP0971123B1 (fr) 2003-05-07

Family

ID=7873708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113205A Expired - Lifetime EP0971123B1 (fr) 1998-07-10 1999-07-08 Pompe d'injection de carburant

Country Status (3)

Country Link
EP (1) EP0971123B1 (fr)
AT (1) ATE239868T1 (fr)
DE (2) DE19831078A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003054376A1 (fr) * 2001-12-21 2003-07-03 L'orange Gmbh Injecteur pour moteurs a combustion interne
EP1598548A1 (fr) * 2004-05-20 2005-11-23 Magneti Marelli Powertrain S.p.A. Méthode et système d'injection directe de carburant dans un moteur à combustion interne
EP1505294B1 (fr) * 2003-08-07 2007-01-24 Delphi Technologies, Inc. Ensemble de pompe
EP2525076A4 (fr) * 2010-01-15 2016-03-16 Hyun Dai Heavy Ind Co Ltd Système d'injection d'une pompe d'injection de carburant

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304084C2 (de) 1993-02-11 1995-03-09 Orange Gmbh Einspritzpumpenelement mit schrägen Steuerkanten

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2067883A5 (fr) * 1969-11-20 1971-08-20 Peugeot
US4163634A (en) * 1977-11-25 1979-08-07 Caterpillar Tractor Co. Fuel pump plunger
DE3347430A1 (de) * 1983-12-29 1985-07-11 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
ATE54723T1 (de) * 1986-11-21 1990-08-15 Bosch Robert Pumpenelement einer brennstoffeinspritzpumpe fuer einspritzbrennkraftmaschinen.
DE3804843A1 (de) * 1988-02-17 1989-08-31 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE4002557C2 (de) * 1990-01-30 1996-02-01 Orange Gmbh Hochdruck-Kolbenpumpe
DE4006899A1 (de) * 1990-03-06 1991-09-12 Mak Maschinenbau Krupp Verfahren und vorrichtung zur vermeidung einer kavitation an einem pumpenelement einer einspritzpumpe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304084C2 (de) 1993-02-11 1995-03-09 Orange Gmbh Einspritzpumpenelement mit schrägen Steuerkanten

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003054376A1 (fr) * 2001-12-21 2003-07-03 L'orange Gmbh Injecteur pour moteurs a combustion interne
US6991179B2 (en) 2001-12-21 2006-01-31 L'orange Gmbh Injector for internal combustion engines
EP1505294B1 (fr) * 2003-08-07 2007-01-24 Delphi Technologies, Inc. Ensemble de pompe
EP1598548A1 (fr) * 2004-05-20 2005-11-23 Magneti Marelli Powertrain S.p.A. Méthode et système d'injection directe de carburant dans un moteur à combustion interne
US7198034B2 (en) 2004-05-20 2007-04-03 Magneti Marelli Powertrain Spa Method and system for the direct injection of fuel into an internal combustion engine
EP2525076A4 (fr) * 2010-01-15 2016-03-16 Hyun Dai Heavy Ind Co Ltd Système d'injection d'une pompe d'injection de carburant

Also Published As

Publication number Publication date
EP0971123A3 (fr) 2001-04-18
ATE239868T1 (de) 2003-05-15
DE59905415D1 (de) 2003-06-12
DE19831078A1 (de) 2000-01-13
EP0971123B1 (fr) 2003-05-07

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