EP0336924A1 - Pumpedüse für Dieselmotoren - Google Patents

Pumpedüse für Dieselmotoren Download PDF

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Publication number
EP0336924A1
EP0336924A1 EP89890091A EP89890091A EP0336924A1 EP 0336924 A1 EP0336924 A1 EP 0336924A1 EP 89890091 A EP89890091 A EP 89890091A EP 89890091 A EP89890091 A EP 89890091A EP 0336924 A1 EP0336924 A1 EP 0336924A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
sleeve
adjustment device
spring
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Withdrawn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
EP89890091A
Other languages
German (de)
English (en)
French (fr)
Inventor
Heinz Rathmayr
Maximilian Dipl.-Ing. Kronberger
Eugen Drummer
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.)
Voestalpine Metal Forming GmbH
Original Assignee
Voestalpine Metal Forming 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 Voestalpine Metal Forming GmbH filed Critical Voestalpine Metal Forming GmbH
Publication of EP0336924A1 publication Critical patent/EP0336924A1/de
Withdrawn legal-status Critical Current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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
    • 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
    • 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
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/243—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movement of cylinders relative to their pistons
    • F02M59/246—Mechanisms therefor
    • 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
    • F02M59/28—Mechanisms therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a pump nozzle for diesel engines, in which an injection pump element having a pump piston driven by a camshaft via a pressure piece and an element sleeve is combined with an injection nozzle to form a unit to be assigned to a respective motor cylinder, the pump piston being mounted non-rotatably relative to the element sleeve Control sleeve is enclosed, the pump piston being rotatable relative to the control sleeve by a quantity adjusting device for adjusting the delivery rate.
  • the pump piston is usually driven via the pressure piece from a cam arranged, for example, on the camshaft of the engine.
  • the pressure piece is formed by a pivotable stilt or a slide shoe, on which the other arm of the rocker arm acts and which is supported against a guide sleeve acting on the pump piston and the pump spring.
  • the pressure piece is formed by a roller tappet or plate tappet, on which the cam acts and which in turn actuates the pump piston.
  • the pump spring is arranged in the upper region of the height of the pump piston.
  • the quantity adjustment device is arranged below the pump spring and on the side of the pump piston. This not only requires a relatively large overall height of the pump, but also the overall width is increased.
  • the element sleeve is designed in two parts and divided in the area of the high pressure chamber of the pump. Such a subdivision requires relatively large and highly stressed sealing surfaces, which also increases the overall width, and the lateral arrangement of the quantity adjustment device increases the overall width.
  • the invention has for its object to provide a pump nozzle with small dimensions and the invention consists essentially in that the quantity adjustment device is arranged in the height region of the pressure piece, that the control sleeve is arranged entirely within the pump spring, that the element sleeve is in one piece with a blind bore is designed for receiving the pump piston and that the pump spring partially surrounds the element sleeve and the height range of the quantity adjustment device extends to the height range of the working space of the pump piston. Because the quantity adjustment device is arranged in the region of the pressure piece, the overall height required for the pressure piece is used for accommodating the quantity adjustment device.
  • the element sleeve is formed in one piece and therefore no large-area seals are required in the area of the high-pressure space makes it possible to keep the diameter of the element sleeve smaller at this point than the diameter of the pump spring.
  • the pump spring can thus have a relatively small diameter and still reach as far as the working area of the pump piston or the high-pressure chamber. Because the pump spring now extends from the height range of the quantity adjustment device to the height range of the working space of the pump piston or the high pressure space, the length of the pump spring can be dimensioned to be relatively large with a small axial extension of the pump nozzle.
  • the fact that the control sleeve is arranged within the pump spring saves a separate space for the control sleeve.
  • the overall dimensions of the pump nozzle are thus reduced. Because the pump spring surrounds the element sleeve from the height range of the quantity adjustment device or the pressure piece up to approximately the height of the high-pressure chamber, a large part of the height of the element sleeve is used for the height of the pump spring.
  • the quantity adjustment device expediently surrounds the pressure piece, so that the entire space around the pressure piece can be used for accommodating the quantity adjustment device.
  • the quantity adjustment device expediently has a part which is rotatable about the axis of the pump piston and which is coupled to the pump piston. According to a preferred embodiment of the invention, this part which can be rotated about the axis of the pump piston is formed by the rotor of an electric servomotor.
  • an injection start adjustment device which adjusts the control sleeve in the direction of the axis of the pump piston, can be arranged in the height region of the end of the pump spring facing the pressure piece outside the pump spring and below the delivery amount adjustment device in the housing of the pump nozzle. Because the injection start adjustment device is arranged between the delivery quantity adjustment device and the end of the pump spring facing the pressure piece outside the pump spring, the overall height of the pump nozzle is reduced.
  • the overall width is increased on one side by the injection start adjustment device, however, this injection start adjustment device lies in the area of the end of the pump spring facing the pressure piece and in this area the pump nozzle does not protrude into the cylinder head, so that a widening of the dimensions of the pump nozzle does not have a disadvantageous effect in this area .
  • the upper end of the pump spring is usually guided in the housing of the pump nozzle by means of a guide sleeve.
  • this guide sleeve expediently has openings for the passage of connecting members of the quantity and / or injection start adjustment device.
  • the element sleeve can have a bore, coaxial with the blind bore for receiving the pump piston, for receiving an escape piston.
  • This also includes the cylinder of the evasive piston in the one-piece element sleeve and it is only necessary to connect the working space of the evasive piston to the high-pressure space by means of a small-diameter bore.
  • the overall width is again reduced in comparison with designs in which a cylinder for the alternative piston is attached laterally to the pump piston liner. This is essential because the working space of the evasive piston must be connected to the high-pressure space or to the working space of the pump piston and this area of the pump nozzle extends into the engine cylinder head.
  • 1 represents the element sleeve, which has a blind bore 2, in which the pump piston 3 is guided.
  • the pump piston 3 is driven against the force of the pump spring 4 by a camshaft, not shown, via a rocker arm 5 and a pressure piece designed as a stilt 6. 7 is the high-pressure space, which forms the working space of the pump piston 3.
  • the pump spring 4 extends down to the height of the high-pressure chamber 7. It can therefore the pump spring 4 ratio with a small height of the pump nozzle ratio be measured moderately long.
  • the upper region of the pump spring 4 is guided in the housing 9 of the pump nozzle by means of a guide sleeve 8.
  • the stilt driven by the rocker arm 5 is supported against this guide sleeve 8 and the guide sleeve 8 actuates the pump piston 3.
  • the 10 is the quantity adjustment device, which is formed by an electric servomotor 11.
  • the rotor 12 of this electric servomotor 11 can be rotated about an axis 13 which is concentric with a central position of the stilt 6.
  • the rotor 12 has a slot 14 in which a crank arm 15 engages, which is connected to the pump piston 3 in a rotationally secure manner via a connecting member 16.
  • 17 is a control sleeve, relative to which the pump piston 3 is rotated via the crank arm 15 for the purpose of quantity adjustment.
  • the delivery start adjustment device or injection start adjustment 18, which forms the subject of another patent application by the applicant, has a hydraulic piston 19 which is displaceable in its axial direction and acts with an inclined surface on a hook-like connecting member 20 which is connected to a sleeve 21.
  • the sleeve 21 is coupled in the axial direction to the control sleeve 17 and cannot be rotated relative to the latter.
  • the upper edge of the control sleeve 17 adjusts the start of delivery.
  • the delivery start adjustment device 18 is thus arranged in the upper region of the pump spring 4 outside the latter.
  • the guide sleeve 8 has openings 22 and 23 for the passage of the connecting member 16 of the quantity adjusting device 10 and for the passage of the hook-shaped connecting member 20 of the conveying start adjusting device 18.
  • a second blind bore 24 is provided in the element sleeve 1, which starts from the other end of the element sleeve 1.
  • an evasive piston 25 is guided, which is acted upon by the pressure in the high-pressure chamber 7 against the pressure of a spring 27 via a connecting bore 26.
  • the escape piston is also included in the element sleeve.
  • the embodiment according to FIGS. 3 and 4 differs from the embodiment according to FIGS. 1 and 2 essentially in that the conveying start adjustment device 28 is arranged entirely within the pump spring 4.
  • This conveying start adjustment device 28 which forms the subject of another patent application by the applicant, has an annular segment piston 30 which is tightly guided in an annular groove 29 of the element sleeve 1 and which is rotated against the force of a torsion spring 32 by the pressure of a hydraulic medium in the working space 31.
  • 33 is a part rigidly connected to the element sleeve 1, which delimits the working space 31.
  • a hook-shaped guide element 34 is connected to the ring segment piston 30 and engages in an annular groove 35 of a control sleeve 36.
  • the annular groove 35 extends obliquely to a plane normal to the axis of the pump piston 3 and the control sleeve 36 is raised or lowered by the rotation of the ring segment piston 30, the height of the upper edge of this control sleeve 36 determining the start of delivery or the start of injection.
  • the pump spring 4 extends from the top to the height area of the high-pressure space 7.
  • the quantity adjustment device 37 is again in the area of the stilt 6 and is designed in the same way as in FIG. 1.
  • the piston 3 is rotated by the crank 15 via the connecting member 16, which is connected to the pump piston 3 in a rotationally secure manner.
  • a breakthrough for the implementation of a connecting member of the delivery start adjustment device 28 is not necessary since the entire delivery start adjustment device 28 is located within the pump spring 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP89890091A 1988-04-08 1989-04-05 Pumpedüse für Dieselmotoren Withdrawn EP0336924A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3811796 1988-04-08
DE3811796 1988-04-08
DE3813320 1988-04-20
DE3813320A DE3813320A1 (de) 1988-04-08 1988-04-20 Pumpenduese fuer dieselmotoren

Publications (1)

Publication Number Publication Date
EP0336924A1 true EP0336924A1 (de) 1989-10-11

Family

ID=25866820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89890091A Withdrawn EP0336924A1 (de) 1988-04-08 1989-04-05 Pumpedüse für Dieselmotoren

Country Status (4)

Country Link
US (1) US4957090A (enrdf_load_stackoverflow)
EP (1) EP0336924A1 (enrdf_load_stackoverflow)
JP (1) JPH0242172A (enrdf_load_stackoverflow)
DE (1) DE3813320A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002086307A1 (de) * 2001-04-21 2002-10-31 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237682A1 (de) * 1992-11-07 1994-05-11 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung, insbesondere Rumpedüse für Brennkraftmaschinen
US5682858A (en) * 1996-10-22 1997-11-04 Caterpillar Inc. Hydraulically-actuated fuel injector with pressure spike relief valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805024A1 (de) * 1968-10-25 1970-05-21 Orange Gmbh Kraftstoffeinspritzvorrichtung
EP0027792A1 (de) * 1979-10-15 1981-04-29 Friedmann & Maier Aktiengesellschaft Einspritzpumpe für Einspritzbrennkraftmaschinen, insbesondere Dieselmotoren
DE3143073A1 (de) * 1981-10-30 1983-05-11 Robert Bosch Gmbh, 7000 Stuttgart Einspritzpumpe mit einstellbarem spritzzeitpunkt

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US30189A (en) * 1860-10-02 Improvement in making emery-wheels
US2147390A (en) * 1934-04-17 1939-02-14 Provencale De Const Aeronautiq Fuel feed pump
USRE30189E (en) 1973-07-02 1980-01-15 Cummins Engine Company Fuel injection system for diesel engines
US3999529A (en) * 1975-05-19 1976-12-28 Stanadyne, Inc. Multiple plunger fuel injection pump
US4146178A (en) * 1977-05-18 1979-03-27 Caterpillar Tractor Co. Unit fuel injector
JPS619182Y2 (enrdf_load_stackoverflow) * 1981-03-04 1986-03-22
DE3428174A1 (de) * 1984-07-31 1986-02-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3447374A1 (de) * 1984-12-24 1986-07-10 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3447375A1 (de) * 1984-12-24 1986-07-03 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3724409A1 (de) * 1986-10-31 1988-05-19 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0301222B1 (de) * 1987-07-25 1992-05-06 Robert Bosch Gmbh Kraftstoffeinspritzpumpe für Brennkraftmaschinen
JPH064773A (ja) * 1992-06-22 1994-01-14 Tokyo Electric Co Ltd 商品販売データ処理装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805024A1 (de) * 1968-10-25 1970-05-21 Orange Gmbh Kraftstoffeinspritzvorrichtung
EP0027792A1 (de) * 1979-10-15 1981-04-29 Friedmann & Maier Aktiengesellschaft Einspritzpumpe für Einspritzbrennkraftmaschinen, insbesondere Dieselmotoren
DE3143073A1 (de) * 1981-10-30 1983-05-11 Robert Bosch Gmbh, 7000 Stuttgart Einspritzpumpe mit einstellbarem spritzzeitpunkt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 170 (M-315)(1607) 07 August 1984, & JP-A-59 63360 (NIPPON DENSO K.K.) 11 April 1984, *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002086307A1 (de) * 2001-04-21 2002-10-31 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine brennkraftmaschine
US6823848B2 (en) * 2001-04-21 2004-11-30 Robert Bosch Gmbh Fuel injection system for an internal combustion engine

Also Published As

Publication number Publication date
DE3813320A1 (de) 1989-10-19
JPH0242172A (ja) 1990-02-13
DE3813320C2 (enrdf_load_stackoverflow) 1990-05-23
US4957090A (en) 1990-09-18

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