EP0474801A1 - Dispositif d'injection de carburant, en particulier un gicleur de pompe - Google Patents

Dispositif d'injection de carburant, en particulier un gicleur de pompe

Info

Publication number
EP0474801A1
EP0474801A1 EP91903989A EP91903989A EP0474801A1 EP 0474801 A1 EP0474801 A1 EP 0474801A1 EP 91903989 A EP91903989 A EP 91903989A EP 91903989 A EP91903989 A EP 91903989A EP 0474801 A1 EP0474801 A1 EP 0474801A1
Authority
EP
European Patent Office
Prior art keywords
bore
piston
flushing
solenoid valve
line
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Withdrawn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
EP91903989A
Other languages
German (de)
English (en)
Inventor
François Rossignol
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 EP0474801A1 publication Critical patent/EP0474801A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical

Definitions

  • Fuel injection device in particular pump nozzle
  • the invention relates to a fuel injection device for injection internal combustion engines, in particular a pump nozzle, in which the delivery start and delivery end are controlled by a solenoid valve connected between a low-pressure circuit and a working area of the pump piston, a flushing line which can be connected to the working area being provided is, which is connected to a low pressure chamber or the tank, and wherein a supply line for supplying the fuel from the solenoid valve via a connection bore to the working chamber of the pump piston crosses the guide bore of the pump piston.
  • the flushing hole is formed by a separate auxiliary hole which, offset on the circumferential side from the feed hole, opens into the guide hole of the pump piston and is controlled in the region of the bottom dead center position by the front edge of the pump piston.
  • Such an additional hole is expensive.
  • the invention aims to simplify the construction and reduce the manufacturing costs.
  • the invention therefore essentially consists in that the part of the feed line which is turned away from the solenoid valve and is located behind the crossing point with the guide bore of the piston is used as a rinsing bore of the rinsing line.
  • the part of the feed bore which is turned away from the solenoid valve and lies behind the intersection with the guide bore of the pump piston, only serves to make the bore possible in the known injection pumps.
  • this part of the feed bore which is closed at its end, is a dead part. This previously dead part of the feed hole is now used as a flushing hole and the elimination of a separate flushing hole or line reduces the manufacturing effort for the injection pump.
  • the feed bore runs obliquely in the direction of the top dead center position.
  • This has the advantage that the hole can be made more easily.
  • the inclination can now advantageously be dimensioned so large, in accordance with a further embodiment of the invention, that a piston end edge in the region of the bottom dead center position opens the mouth of the flushing bore or this otherwise dead part of the supply bore. This enables the working area to be flushed in the bottom dead center position.
  • the invention enables further flushing in the top dead center position of the piston.
  • the arrangement is expediently such that the part of the feed hole located behind the intersection and used as a rinsing hole is connected to the part of the feed line that starts from the solenoid valve and is continuously connected to the working space of the pump piston via the connection hole , in the area of the top dead center position of the piston can be connected via a recess or annular groove of the piston.
  • the connection between the working chamber of the piston and the low-pressure chamber or the tank is now established in the top dead center position.
  • a check valve opening in the direction of the low-pressure chamber can be arranged in a branch line of the flushing line connecting this flushing bore or the dead part of the " supply bore to the low-pressure chamber.
  • Figures 1 and 2 represent sections of an embodiment belonging to the prior art
  • Fig.l one Section along line II of Fig.2 and Fig.2 shows a section along line II-II of Fig.l.
  • Figures 3 and 4 show in longitudinal section an embodiment which enables purging in the bottom dead center position, wherein Figure 3 shows the piston in the bottom dead center position and Figure 4 shows the piston just before reaching the top dead center position.
  • 5 shows a partial section according to FIG. 3 in a slightly modified embodiment.
  • 6 and 7 show an embodiment in which the purging takes place in the area of the top dead center position in longitudinal section, FIG. 6 showing the piston position in the bottom dead center position and FIG. 7 the piston position in the area of the top dead center position .
  • top dead center and bottom dead center refer to the cam elevation.
  • the top dead center position (TDC) is the dead center position of the piston at the end of the pressure stroke and the bottom dead center position (UT) is the piston position at the end of the suction stroke.
  • Fig.l and 2 show the prior art.
  • 1 is the piston of an injection pump designed as a pump nozzle.
  • 2, 3 is a feed bore of the feed line which crosses the guide bore of the pump piston 1. Part 3 of the feed bore 2 is closed and represents a dead bore.
  • the flushing bore 4 is separate and offset by 90 ° with respect to the feed bore 2, 3.
  • 5 represents the solenoid valve. From this solenoid valve 5, the fuel reaches the feed bores of a feed line 6, 7 under feed pump pressure and from there via a connection bore 8 into the working space 9 of the piston 10.
  • the feed bore 7 is arranged obliquely and crosses a guide bore 11 of the piston 10, the dead part of the feed line 7 in the prior art (FIGS.
  • FIGS. 3 and 4 the bore 7, 12 is arranged steeper than in the injection pump according to FIGS. 1 and 2, which forms the state of the art.
  • FIG. 5 shows a variant in which the bore 7, 12 has the same slope, as in the illustration according to Fig.l.
  • the piston 10 is, however, reduced to a smaller diameter in the region of its end edge 14, so that the recessed end edge 14 can open the mouth 15 of the flushing bore 12 again in the bottom dead center position.
  • FIGS. 6 and 7 show an embodiment which enables flushing in the top dead center position.
  • FIG. 6 shows the piston 17 in UT, ie in the bottom dead center position, and FIG. 7 in the top dead center position. No flushing takes place here in the bottom dead center position.
  • the piston 17 has an annular groove 18.
  • the feed bore 7 is connected to the flushing bore 12 through this annular groove 18, so that the bore 12 is used again as a flushing bore 12.
  • the feed hole 7 is also connected in the same way as in the embodiment according to FIGS. 3 and 4 via the connecting hole 8 to the working space 9 of the piston 17 and enables control in a known manner, regardless of the respective position of the piston 17 the start and end of delivery of the injection by means of the solenoid valve 5.

Landscapes

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

Abstract

Dispositif d'injection de carburant, en particulier un gicleur de pompe, servant à injecter du carburant dans des moteurs à combustion interne à injection, dans lequel la commande de début d'alimentation et de fin d'alimentation est assurée par une électrovanne (5) montée entre un circuit à basse pression et un espace de travail (9) du piston (10; 17) de la pompe. Ce dispositif d'injection comprend un trou de balayage (12) qui peut être relié à l'espace de travail (9) du piston, le trou de balayage étant relié à un espace à basse pression et au réservoir de carburant. Un trou d'alimentation (7) de la conduite d'alimentation sortant de l'électrovanne (5) croise le trou de guidage (11) du piston (10; 17) de la pompe. Au lieu d'utiliser un trou de balayage particulier, on utilise comme trou de balayage (12) la partie du trou d'alimentation (7) qui se trouve derrière le point d'intersection avec le trou de guidage (11) du piston (10; 17) et qui est dérivée de l'électrovanne (5).
EP91903989A 1990-03-31 1991-03-01 Dispositif d'injection de carburant, en particulier un gicleur de pompe Withdrawn EP0474801A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4010449 1990-03-31
DE4010449A DE4010449A1 (de) 1990-03-31 1990-03-31 Kraftstoffeinspritzeinrichtung, insbesondere pumpeduese

Publications (1)

Publication Number Publication Date
EP0474801A1 true EP0474801A1 (fr) 1992-03-18

Family

ID=6403507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91903989A Withdrawn EP0474801A1 (fr) 1990-03-31 1991-03-01 Dispositif d'injection de carburant, en particulier un gicleur de pompe

Country Status (5)

Country Link
US (1) US5259351A (fr)
EP (1) EP0474801A1 (fr)
JP (1) JPH04505792A (fr)
DE (1) DE4010449A1 (fr)
WO (1) WO1991015674A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588475B1 (fr) * 1992-07-23 1996-04-03 Zexel Corporation Dispositif d'injection de combustible
US5682861A (en) * 1996-05-23 1997-11-04 Caterpillar Inc. Fluid seal for cyclic high pressures within a fuel injection
JPH11324855A (ja) * 1998-05-01 1999-11-26 Komatsu Ltd オイルシール付燃料噴射装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219154A (en) * 1978-07-10 1980-08-26 The Bendix Corporation Electronically controlled, solenoid operated fuel injection system
US4448169A (en) * 1980-12-31 1984-05-15 Cummins Engine Company, Inc. Injector for diesel engine
US4467772A (en) * 1982-04-13 1984-08-28 Williamson Charles A Modular barrel fuel injection apparatus
ATE59434T1 (de) * 1984-09-14 1991-01-15 Bosch Gmbh Robert Elektrisch gesteuerte kraftstoffeinspritzpumpe fuer brennkraftmaschinen.
US4618095A (en) * 1985-07-02 1986-10-21 General Motors Corporation Electromagnetic unit fuel injector with port assist spilldown
DE3629754C2 (de) * 1986-09-01 1994-07-14 Bosch Gmbh Robert Vorrichtung zur Erzeugung von Voreinspritzungen bei Pumpedüsen
DE3923271A1 (de) * 1989-07-14 1991-01-24 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen, insbesondere pumpeduese

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9115674A1 *

Also Published As

Publication number Publication date
DE4010449A1 (de) 1991-10-02
JPH04505792A (ja) 1992-10-08
US5259351A (en) 1993-11-09
WO1991015674A1 (fr) 1991-10-17

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