EP0971122B1 - Pompe à injection de carburant pour un moteur à combustion interne - Google Patents

Pompe à injection de carburant pour un moteur à combustion interne Download PDF

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Publication number
EP0971122B1
EP0971122B1 EP99113211A EP99113211A EP0971122B1 EP 0971122 B1 EP0971122 B1 EP 0971122B1 EP 99113211 A EP99113211 A EP 99113211A EP 99113211 A EP99113211 A EP 99113211A EP 0971122 B1 EP0971122 B1 EP 0971122B1
Authority
EP
European Patent Office
Prior art keywords
piston
bypass
fuel injection
control
injection pump
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.)
Expired - Lifetime
Application number
EP99113211A
Other languages
German (de)
English (en)
Other versions
EP0971122A2 (fr
EP0971122A3 (fr
Inventor
Rolf Prillwitz
Hans-Joachim Koch
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 EP0971122A2 publication Critical patent/EP0971122A2/fr
Publication of EP0971122A3 publication Critical patent/EP0971122A3/fr
Application granted granted Critical
Publication of EP0971122B1 publication Critical patent/EP0971122B1/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
    • 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
    • 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
    • F02M59/22—Varying quantity or timing by adjusting cylinder-head space
    • 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

Definitions

  • the invention relates to a fuel injection pump for an internal combustion engine according to the Preamble of claim 1.
  • Such a fuel injection pump comprises a one that is guided in a pump cylinder Pump piston and a pressure chamber delimited by the pump piston, from which the fuel delivered by the pump piston via a delivery channel for delivery in the combustion chamber of the internal combustion engine is released.
  • the pump piston has an upper control edge on the pressure chamber side and at least one lower one Control edge, which by sweeping at least one with a suction chamber Fuel injection pump connected, opening into the pressure chamber Determine the control bore for the start and end of fuel delivery for the injection pump.
  • a fuel injection pump is known to be known from JP abstract 59077046 A, in which an escape piston which is arranged displaceably in a bore is provided, which is connected to the pressure chamber of the fuel injection pump Alternative space limited.
  • the escape piston works with one of an adjustment rod formed stop together, the adjusting rod by means of a hydraulic actuatable piston is adjustable to the evasive stroke for the evasive piston adjust.
  • the start of injection can be controlled by the device.
  • the control piston arrangement has a first, from the injection pressure in the pressure chamber of the injection pump directly acted upon control piston and a second with this with the interposition of one Compression spring coupled control piston to form the first control piston a valve cooperates, which is designed to block a throttle bore, that connects the pressure chamber with an outlet space.
  • the object of the invention is therefore to provide a fuel injection pump Art in such a way that a relatively simple way to adjust the beginning of Fuel injection is possible.
  • This task is performed by a fuel injection pump with the characteristics of Claim 1 solved.
  • a fuel injection pump for an internal combustion engine created that a pump piston guided in a pump cylinder and one of the pump piston has limited pressure space, from which the Pump piston delivered fuel via a delivery channel for delivery into the Combustion chamber of the internal combustion engine is released.
  • the pump piston has a upper control edge on the pressure chamber side and at least one lower control edge, which by painting over at least one with a suction chamber of the Fuel injection pump connected, opening into the pressure chamber Determine the control bore for the start and end of fuel delivery for the injection pump.
  • a hole slidably arranged escape piston provided which one with the Pressure room related alternative space limited and in the sense of a Enlargement of the evasive space via an evasive stroke s between an initial position and an end position is displaceable.
  • means for adjusting the Dodge stroke s of the dodge piston provided.
  • the means of adjusting the Dodge strokes s of the dodge piston are operated by a hydraulically operated one Adjustment device formed in the form of a displaceable in a bore by one pressurized fluid pressurized control piston, the location of which is the size of the Dodge stroke of the dodge piston determined.
  • a control device is used to feed and Switching off the hydraulic pressure actuating the control piston.
  • control piston and the escape piston are in one Bore slidably mounted, the control piston a the evasive stroke s of Dodge piston limiting contact surface.
  • An advantage of the fuel injection pump according to the invention is that the start of the Fuel injection in a simple manner by means of shifting the Dodge piston required fuel volume can be delayed, the Means for adjusting the evasive stroke of the evasive piston in a simple manner can be designed so that they allow displacement of the evasive piston or not, i.e. an adjustment of the start of injection from early to late or from late to early.
  • the evasive piston is at the end on the pressure chamber side arranged to the pump housing connecting piece, one of the alternate piston delimiting the alternate space with the pressure chamber Connection channel opens at the front of the pressure chamber.
  • the escape piston by an auxiliary spring for return to its Initial position is spring-loaded. This is an easy measure to use the backup piston return to its initial position after the end of fuel injection.
  • the evasive piston to Purposes of returning to its initial position on its back over one Connection channel is coupled to the suction chamber of the fuel pump.
  • the return piston is returned to its initial position by the Suction chamber of the fuel pump pre-pressure.
  • control piston has a larger one than the one under pressure Area to which fluid can be applied than that in the pressure chamber of the fuel injection pump the pressurized fuel surface of the escape piston. This allows a lower pressure to be used to operate the Control piston than the high supplied by the fuel injection pump Fuel injection pressure.
  • An advantageously simple embodiment of this consists in that on the Dodge piston with a connecting channel leading to the pressure chamber surrounding sealing surface cooperating flat seat is formed, the at the sealing surface of the flat seat adjacent to that in the pressure chamber under pressure standing fuel area of the evasive piston smaller than that of the is the pressurized fluid pressurized surface of the control piston.
  • the lubricating oil of the internal combustion engine advantageously becomes hydraulic Actuation of the control piston used.
  • the control piston is preferably between an initial position and one through one Stop limited end position movable.
  • the means for Adjustment of the stop by means of a threaded spindle that can be rotated by means of a servomotor are formed.
  • reference numeral 1a denotes a connector on a Pump housing 1c of the fuel injection pump, being in the pump housing 1c Pump cylinder 1b is formed.
  • a pump piston 2 in is in the pump cylinder 1b Axially displaceably mounted, which one at the top of the pump cylinder 1b designed pressure chamber 3 limits the end face of the pressure chamber 3 Pump piston 2 forms a piston head 5.
  • the pump piston 2 has at its in the figures no longer shown lower end via a piston foot through which he by means of a cam driven by the internal combustion engine in an oscillating manner is driven. Furthermore, one is also in at the lower end of the pump piston 2 arranged in the figures not shown piston flag, by means of which Pump piston 2 for controlling the injection duration and quantity via a predetermined one Angular range is rotatable about its axis.
  • the pump piston 2 On the piston head 5, the pump piston 2 has an upper pressure chamber side Control edge 6. Furthermore, there are two lower, sloping ends on the pump piston 2 Control edges 7 formed. The upper control edge 6 and the lower control edge 7 limit together with a connection of the pressure chamber 3 with the bottom of the oblique control edges 7 producing piston groove 8 each a control triangle, which by painting each one with a suction space 20 outside the Pump cylinder 1b connected, opening into the pressure chamber 3 Control bore 4a, 4b start and end of fuel delivery of the injection pump certainly.
  • Piston flag By rotating the pump piston 2 by means of the aforementioned Piston flag is created by changing the mutual position of the lower control edge 7 and control bore 4a, 4b the end of fuel delivery and thus the injection duration set.
  • the fuel injection pump described corresponds to the known.
  • the fuel displaced from the pressure chamber 3 by the pump piston 2 is transferred via a a delivery valve 9 containing a pressure valve 21 and via a pressure connection 22 for Delivery to a fuel injector for injection into the combustion chamber Internal combustion engine delivered.
  • connection piece 1 a the pump piston 2 is upstream of the pressure chamber Dodge piston 12 slidably disposed in a bore 10.
  • the escape piston 12 delimits an escape space 18 on its underside, compare FIG a connecting channel 19 with the pressure chamber 3 of the fuel injection pump in Connection is established
  • the escape piston 12 is in the sense of an enlargement of the Alternative room 18 between an initial position and an end position over one Dodge stroke s displaceable, see Figure 1a).
  • Control piston 11 slidably mounted. Between the escape piston 12 and the control piston 11, an auxiliary spring 13 is provided which the evasive piston 12 Forces towards its starting position closer to the pressure chamber 3. Furthermore is a Volume enclosed between the escape piston 12 and the control piston 11 coupled to the suction space 20 via a connecting channel 14.
  • the room above the Control piston 11 is via a hydraulic channel 17 with a hydraulic connection 16th connected, which with a control hydraulics not shown in the figure in Connection is established.
  • a stop 15 is formed at the upper end of the bore 10, which serves to limit the displacement path of the control piston 12 upwards.
  • the control piston 11 slidably mounted in the bore 10 forms a hydraulic one actuated adjusting device for adjusting the evasive stroke s of the evasive piston 12th
  • the control piston 11 is thus by means of the pressure supplied via the hydraulic channel 17 between an initial position, which is given when the evasive piston 12 with its flat seat 12a abuts the sealing surface 12b and the control piston 12 in turn abuts on the evasive piston 12, and an end position that can be moved by the The control piston 11 bears against the stop 15.
  • Figure 1a shows the fuel injection pump in a state in which the pump piston 2 is at its bottom dead center.
  • the control piston 11 is not pressurized via the hydraulic channel 17, so that due to the spring force of the auxiliary spring 13 and the pressure of the suction chamber 20 applied via the connecting channel 14, the control piston 11 is located at the upper stop 15 and the escape piston 12 with its flat seat 12a on it Sealing surface 12b is present.
  • the suction chamber pressure P s typically assumes a value of up to 15 bar before the start of each injection.
  • the evasive piston 12 is prepared for an evasive movement by the evasive stroke s in the direction of the control piston 11.
  • the pressure in the pressure chamber 3 rises and this is transferred via the connecting channel 19 to the area on the underside of the evasive piston 12 that is released by the flat seat 12a If the force caused thereby exceeds the force resulting from the spring force of the auxiliary spring 13 and the pressure force transmitted from the suction chamber 20 via the connecting channel 14, the evasive piston 12 begins to evade the stroke s and thus takes the pump pressure chamber 3 through the cross section of the bore 10 and the evasive stroke s defined volume. As a result, the further increase in the pressure chamber 3 of the fuel injection pump is delayed until the evasive piston 12 stops evading when it contacts the control piston 11.
  • Figure 1c shows the state in which the control piston 11 and the evasive piston 12 are in their lower position for an earlier start of injection. Because of the over the hydraulic channel 17 on the control piston 11 applied hydraulic pressure, which is, for example, 300 bar, the evasive piston 12 because of the Size ratio between the area of the hydraulic pressure Control piston 11 and located within the flat seat 12a, via the Connection channel 19 of the fuel pressure prevailing in the pressure chamber 3 acted upon surface of the evasive piston 12 with its flat seat 12a reliably held on the sealing surface 12b and thus an evasive movement the same made impossible, although the fuel pressure in the pressure chamber 3 one reached much higher value.
  • hydraulic pressure which is, for example, 300 bar
  • Fuel injection pump according to the invention takes place by means of the control piston 11 Switching between two states, namely one in which the evasive piston 12 is released and thus a delay of the evasive movement Injection is started at a later time, and a state in which prevents an evasive movement of the evasive piston 12 and thus a Injection takes place at an earlier point in time without delay.
  • Such means for creating the stop 15 of the control piston 11 or for direct Adjustment of the evasive stroke s of the evasive piston 12 can be achieved by means of a Servomotor rotatable threaded spindle can be formed, which then a variable Federal start adjustment is possible.

Landscapes

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

Claims (10)

  1. Pompe d'injection de carburant pour un moteur à combustion interne avec un piston de pompe (2) guidé dans un cylindre de pompe (1b) et une chambre de refoulement (3) limitée par le piston de pompe (2), au départ de laquelle le carburant refoulé par le piston de pompe (2) est transmis par un canal de transfert (9) pour son introduction dans la chambre de combustion du moteur à combustion interne, dans laquelle le piston de pompe (2) présente une arête de commande supérieure (6) située du côté de la chambre de refoulement et au moins une arête de commande inférieure (7), qui déterminent, par le franchissement d'au moins un alésage de commande (4a, 4b) débouchant dans la chambre de refoulement (3) et communiquant avec une chambre d'aspiration (20) de la pompe d'injection de carburant, le commencement et la fin du refoulement de carburant par la pompe d'injection, dans laquelle il est prévu, pour le réglage du commencement de l'injection de carburant, un piston de déviation (12) disposé de façon coulissante dans un alésage (10), qui limite une chambre de déviation (18) communiquant avec la chambre de refoulement (3) et qui peut coulisser dans le sens d'un agrandissement de la chambre de déviation (18) par une course de déviation s entre une position initiale et une position finale, dans laquelle il est prévu des moyens pour le réglage de la course de déviation s du piston de déviation (12), dans laquelle les moyens pour le réglage de la course de déviation s du piston de déviation (12) sont formés par un dispositif de réglage à commande hydraulique, dans laquelle le dispositif de réglage à commande hydraulique est formé par un piston de commande (11) actionnable par un fluide se trouvant sous pression, dont la position détermine la grandeur de la course de déviation s du piston de déviation (12), et dans laquelle il est prévu un dispositif de commande pour appliquer et interrompre la pression hydraulique actionnant le piston de commande (11), caractérisée en ce que le piston de commande (11) et le piston de déviation (12) sont installés de façon coulissante dans un alésage commun (10), le piston de commande (11) présentant une face d'appui limitant la course de déviation s du piston de déviation (12).
  2. Pompe d'injection de carburant suivant la revendication 1, caractérisée en ce que le piston de déviation (12) est disposé dans une pièce de raccordement (1a) formant la tête de pompe à l'extrémité du côté de la chambre de refoulement, et en ce qu'un canal de communication (19) reliant la chambre de déviation (18) limitée par le piston de déviation (12) avec la chambre de refoulement (3) débouche dans la face frontale de la chambre de refoulement (3).
  3. Pompe d'injection de carburant suivant la revendication 1 ou 2, caractérisée en ce que le piston de déviation (12) est chargé élastiquement par un ressort auxiliaire (13) pour le retour dans sa position initiale.
  4. Pompe d'injection de carburant suivant l'une quelconque des revendications 1 à 3, caractérisée en ce que le piston de déviation (12) est couplé sur sa face arrière par un canal de communication (14) avec la chambre d'aspiration (20) de la pompe d'injection de carburant pour le retour dans sa position initiale.
  5. Pompe d'injection de carburant suivant l'une quelconque des revendications 1 à 4, caractérisée en ce que le piston de commande (11) présente une surface soumise au fluide sous pression plus grande que la face du piston de déviation (12) soumise au carburant sous pression se trouvant dans la chambre de refoulement (3) de la pompe d'injection de carburant.
  6. Pompe d'injection de carburant suivant la revendication 5, caractérisée en ce qu'un siège plat (12a) coopérant avec une face d'étanchéité (12b) entourant le canal de communication (19) menant à la chambre de refoulement (3) est formé sur le piston de déviation (12), dans laquelle la face du piston de déviation (12) soumise au carburant sous pression se trouvant dans la chambre de refoulement (3) est, lorsque le siège plat (12a) est appliqué sur la face d'étanchéité (12b), plus petite que la face du piston de commande (11) soumise au fluide sous pression.
  7. Pompe d'injection de carburant suivant l'une quelconque des revendications 1 à 6, caractérisée en ce que le piston de commande (11) peut être soumis, pour la commande hydraulique, à la pression de l'huile de lubrification du moteur à combustion interne.
  8. Pompe d'injection de carburant suivant l'une quelconque des revendications 1 à 7, caractérisée en ce que le piston de commande (11) peut coulisser entre une position initiale et une position finale limitée par une butée (15).
  9. Pompe d'injection de carburant suivant la revendication 8, caractérisée en ce que la butée (15) limitant la position finale du piston de commande (11) est réglable, et en ce qu'il est prévu des moyens pour le réglage de la butée (15).
  10. Pompe d'injection de carburant suivant la revendication 9, caractérisée en ce que les moyens pour le réglage de la butée (15) sont formés par une broche filetée pouvant tourner au moyen d'un servomoteur.
EP99113211A 1998-07-10 1999-07-08 Pompe à injection de carburant pour un moteur à combustion interne Expired - Lifetime EP0971122B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19831077 1998-07-10
DE19831077A DE19831077A1 (de) 1998-07-10 1998-07-10 Kraftstoffeinspritzpumpe für eine Brennkraftmaschine

Publications (3)

Publication Number Publication Date
EP0971122A2 EP0971122A2 (fr) 2000-01-12
EP0971122A3 EP0971122A3 (fr) 2001-04-18
EP0971122B1 true EP0971122B1 (fr) 2003-05-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113211A Expired - Lifetime EP0971122B1 (fr) 1998-07-10 1999-07-08 Pompe à injection de carburant pour un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0971122B1 (fr)
AT (1) ATE240456T1 (fr)
DE (2) DE19831077A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004050021A1 (de) * 2004-10-13 2006-04-20 L'orange Gmbh Magnetkolbenpumpe
KR101178630B1 (ko) 2011-04-29 2012-08-30 현대중공업 주식회사 캠구동용 가변압력부를 구비한 연료분사펌프
KR101219977B1 (ko) 2011-04-29 2013-01-09 현대중공업 주식회사 유압 2단구동 가변압력실을 가진 연료분사펌프

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI118055B (fi) * 2005-11-23 2007-06-15 Waertsilae Finland Oy Mäntämoottorin ruiskutuspumppu
KR101144504B1 (ko) * 2010-10-20 2012-05-11 현대중공업 주식회사 가변 압력실을 가지는 연료분사펌프

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537087A (en) * 1942-03-07 1951-01-09 Atlas Diesel Ab Fuel injection apparatus
US2810375A (en) * 1953-04-13 1957-10-22 Nordberg Manufacturing Co Injection pump for internal combustion engines
CH328209A (de) * 1953-12-23 1958-02-28 Cav Ltd Brennstoffeinspritzpumpe für Brennkraftmaschinen
US4469068A (en) * 1981-11-10 1984-09-04 Nippondenso Co., Ltd. Fuel injection apparatus
JPS5977046A (ja) * 1982-10-26 1984-05-02 Nippon Denso Co Ltd 燃料噴射装置
JPS6062658A (ja) * 1983-09-16 1985-04-10 Mitsubishi Heavy Ind Ltd ジャ−ク式燃料ポンプの噴射開始タイミング変更装置
DE3801929C2 (de) * 1987-01-30 1998-07-02 Volkswagen Ag Kraftstoffeinspritzeinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004050021A1 (de) * 2004-10-13 2006-04-20 L'orange Gmbh Magnetkolbenpumpe
KR101178630B1 (ko) 2011-04-29 2012-08-30 현대중공업 주식회사 캠구동용 가변압력부를 구비한 연료분사펌프
KR101219977B1 (ko) 2011-04-29 2013-01-09 현대중공업 주식회사 유압 2단구동 가변압력실을 가진 연료분사펌프

Also Published As

Publication number Publication date
EP0971122A2 (fr) 2000-01-12
DE19831077A1 (de) 2000-01-13
ATE240456T1 (de) 2003-05-15
DE59905531D1 (de) 2003-06-18
EP0971122A3 (fr) 2001-04-18

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