EP0877163A1 - Pompe d'injection de combustible - Google Patents

Pompe d'injection de combustible Download PDF

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Publication number
EP0877163A1
EP0877163A1 EP98107784A EP98107784A EP0877163A1 EP 0877163 A1 EP0877163 A1 EP 0877163A1 EP 98107784 A EP98107784 A EP 98107784A EP 98107784 A EP98107784 A EP 98107784A EP 0877163 A1 EP0877163 A1 EP 0877163A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection pump
valve
valve body
pump according
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
EP98107784A
Other languages
German (de)
English (en)
Other versions
EP0877163B1 (fr
Inventor
Gerhard Domberger
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.)
MAN B&W Diesel GmbH
Original Assignee
MAN B&W Diesel 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 MAN B&W Diesel GmbH filed Critical MAN B&W Diesel GmbH
Publication of EP0877163A1 publication Critical patent/EP0877163A1/fr
Application granted granted Critical
Publication of EP0877163B1 publication Critical patent/EP0877163B1/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
    • F02M59/44—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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • 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
    • F04B49/24—Bypassing
    • 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
    • F04B49/24—Bypassing
    • F04B49/243—Bypassing by keeping open the inlet valve
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/1017—Semi-spherical ball valves

Definitions

  • the invention relates to a fuel injection pump for reciprocating piston internal combustion engines, especially diesel engines, with one containing at least one injector connected workspace Cylinder and with a fuel chamber that can be acted upon by fuel at least one connecting recess in the cylinder wall with the Work space is connected, which is arranged by a cylinder Piston is limited to each connection recess assigned control edges for up and down control of the assigned Connection recess is provided.
  • the piston is displaced in advance the shutdown, that is, before the connection recess is closed or recesses displaced fuel from the work area.
  • This Fuel flows through the connection recess or recesses back into the suction chamber, one with a high Velocity of moving liquid column results. Because of the inertia of fuel leads when the connection recess is shut off or recesses its movement initially what to a strong pressure drop in the area of the connection recess or - leads recesses. There is a risk that the vapor pressure of the Fuel is undercut, so that it leads to the dreaded cavitation in the area of the connection recess or recesses can come.
  • valve body expediently a central throttle bore forming the bypass exhibit. This results in a particularly simple and compact design.
  • Another advantageous measure can be that of the central throttle bore in the suction chamber cross holes come off. This ensures a uniform distribution of the in the suction space backflowing fuel reached.
  • a valve seat containing the valve seat on the cylinder wall can be advantageous attachable ring can be provided, which is assigned to one in the valve body Has guide collar. This ensures high operational reliability reached.
  • the valve body can simply be designed as a pin. This is conveniently provided with a conical valve head with a conical seat of the valve seat interacts, which is a reliable sealing results.
  • Valve spring as opposed blind bores of the valve body and one that can be screwed into the wall of the suction chamber Compression spring engaging stop screw.
  • the fuel injection pump on which FIG. 1 is based can Injection valve of a diesel engine can be assigned.
  • the basic one The structure and the mode of operation of such arrangements are in themselves known.
  • the injection pump shown consists of a one-piece cylinder 1, in which a piston 2 is arranged to reciprocate. This will via a drive unit, not shown, for example a Camshaft, driven.
  • the piston 2 limits one in the cylinder contained work space 3, of which a connection hole 4 for a an injection line not shown in detail leading injection valve goes off.
  • a connection hole 4 for a an injection line not shown in detail leading injection valve goes off.
  • In the area of the connection bore 4 is at a predetermined Pressure-opening check valve 5 is arranged.
  • the cylinder 1 is surrounded by an annular pump housing 6 which together with the cylinder 1 delimits a circumferential suction space 7.
  • the pump housing 6 lies with an end face on an overlapping it Flange of cylinder 1 and is screwed to it.
  • the suction chamber 7 will with a fuel supply device, not shown Pressurized fuel, with a supply pressure of about 5 bar is provided.
  • the suction space 7 is diametrically opposite, the cylinder 1 radially penetrating connection recesses 8 with the working space 3 assigned to the piston 2 forming bore of the cylinder 1 connected.
  • the piston 2 is with peripheral edges delimited by control edges 9, 10
  • Control surfaces 11 provided when passing a connection recess 8 cover these and thus the connection between the work area 3 and interrupt suction chamber 7.
  • Each of the two connection recesses Such a control surface 11 is assigned to 8.
  • the Connection recesses 8 are accordingly at every work cycle the piston turned off and on.
  • Valve arrangement 12 is provided, which as to the outside, that is to the suction space 7 opening check valve arrangement is formed.
  • This consists, as can best be seen from FIG. 2, of one conical valve seat 13 having ring 14 which with a in the Suction chamber 7 projecting collar 15 is provided and one in the collar 15 guided, axially movable valve body 16 which with a conical valve seat 13 assigned, conical valve head 17 is provided.
  • the ring 14 is a coaxial to the associated connection recess 8 Blind bore of cylinder 1 screwed in.
  • the central bore 8 ' (Ellipsis) practically represents the continuation of the connection recess on the ring 8 represents.
  • the conical seat 13 is inside by the Bore 8 'and the outside limited by the collar 15.
  • the valve body 16 is simply designed as a conical screw on one end.
  • valve body 16 is acted upon by a valve spring 18 so that it with its conical valve head 17 on the associated valve seat 13 of the Rings 14 is present.
  • the valve spring 18 is designed as a spiral compression spring on the one hand in a blind bore 19 of the pin-shaped valve body 16 and on the other hand into a blind bore 20 into the pump housing 6 screwed stop screw 21 engages the inside, in the Pump chamber 7 protruding end a mechanical stop for the Valve body 16 forms.
  • the working space 3 In the lowest position of the piston 2, the working space 3 has its greatest extent.
  • the upper edge of the piston forming the control edge 9 is located below the connecting recesses 8. These are accordingly open, so that the working space 3 is connected to the suction space 7 and is filled with fuel.
  • the working space 3 is completely filled with fuel flowing in through the passage recesses 8. This is at the same pressure in both rooms. This pressure, which, as already mentioned above, is approximately 5 bar, is designated P 1 in FIG.
  • the upward stroke should start at time t 1 . In the course of the upward stroke, as long as the connection bores 8 are still open, fuel is pushed back into the suction space 7 via the connection bores 8.
  • a pressure increase up to the value P 2 had previously taken place the pressure does not drop below the vapor pressure, which is indicated in FIG. 3 with a broken line.
  • the diameter of the throttle bores is accordingly designed so that a pressure P 2 is reached which is so high that the subsequent pressure drop does not lead to the range of the vapor pressure of the fuel. In the example shown, a pressure drop occurs approximately at the initial level P 1 at time t 2 .
  • Injection begins at time P 2 . This is ended when the control surfaces 11 of the piston 2 run over and open the associated connection recesses 8 with their lower control edges 10. This is the case in FIG. 3 at time t 3 . This results in a pressure spike hitting the working chamber 3, which leads to the valve assemblies 12 opening with a delay due to the pretensioning of the spring 18, that is to say the valve body 17 of which is lifted off the associated valve seat 13 with its valve head 17. A large flow cross-section is opened, so that there is a comparatively rapid pressure reduction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98107784A 1997-05-06 1998-04-29 Pompe d'injection de combustible Expired - Lifetime EP0877163B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19719046A DE19719046A1 (de) 1997-05-06 1997-05-06 Brennstoffeinspritzpumpe
DE19719046 1997-05-06

Publications (2)

Publication Number Publication Date
EP0877163A1 true EP0877163A1 (fr) 1998-11-11
EP0877163B1 EP0877163B1 (fr) 2001-08-16

Family

ID=7828735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107784A Expired - Lifetime EP0877163B1 (fr) 1997-05-06 1998-04-29 Pompe d'injection de combustible

Country Status (2)

Country Link
EP (1) EP0877163B1 (fr)
DE (2) DE19719046A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1921305A2 (fr) * 2006-11-06 2008-05-14 Mitsubishi Heavy Industries, Ltd. Pompe à injection de carburant équipé d'un déflecteur rotatif
US20110259302A1 (en) * 2008-10-27 2011-10-27 Hyundai Heavy Industries Co., Ltd. Apparatus for preventing cavitation damage to a diesel engine fuel injection pump
US11092123B2 (en) * 2018-07-23 2021-08-17 Sumitomo Riko Company Limited Connector
US11092124B2 (en) * 2018-07-17 2021-08-17 Sumitomo Riko Company Limited Connector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0347582A2 (fr) * 1988-06-18 1989-12-27 Robert Bosch Gmbh Pompe d'injection pour moteurs à combustion interne
DE4225350A1 (de) * 1992-07-31 1994-02-03 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE822453C (de) * 1948-10-02 1951-11-26 Bosch Gmbh Robert Einspritzpumpe, insbesondere fuer leicht siedenden Kraftstoff
DE3820707A1 (de) * 1988-06-18 1989-12-21 Bosch Gmbh Robert Einspritzpumpe fuer brennkraftmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0347582A2 (fr) * 1988-06-18 1989-12-27 Robert Bosch Gmbh Pompe d'injection pour moteurs à combustion interne
DE4225350A1 (de) * 1992-07-31 1994-02-03 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1921305A2 (fr) * 2006-11-06 2008-05-14 Mitsubishi Heavy Industries, Ltd. Pompe à injection de carburant équipé d'un déflecteur rotatif
EP1921305A3 (fr) * 2006-11-06 2008-06-18 Mitsubishi Heavy Industries, Ltd. Pompe à injection de carburant équipé d'un déflecteur rotatif
CN100549407C (zh) * 2006-11-06 2009-10-14 三菱重工业株式会社 设有旋转式导流器的燃料喷射泵
US20110259302A1 (en) * 2008-10-27 2011-10-27 Hyundai Heavy Industries Co., Ltd. Apparatus for preventing cavitation damage to a diesel engine fuel injection pump
US9200605B2 (en) * 2008-10-27 2015-12-01 Hyundai Heavy Industries Co., Ltd. Apparatus for preventing cavitation damage to a diesel engine fuel injection pump
US11092124B2 (en) * 2018-07-17 2021-08-17 Sumitomo Riko Company Limited Connector
US11092123B2 (en) * 2018-07-23 2021-08-17 Sumitomo Riko Company Limited Connector

Also Published As

Publication number Publication date
DE19719046A1 (de) 1998-11-12
DE59801203D1 (de) 2001-09-20
EP0877163B1 (fr) 2001-08-16

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