EP1215391A2 - Module de pompe à cylindre unique pour un système d'injection de combustible d'un moteur à combustion interne - Google Patents

Module de pompe à cylindre unique pour un système d'injection de combustible d'un moteur à combustion interne Download PDF

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Publication number
EP1215391A2
EP1215391A2 EP01129703A EP01129703A EP1215391A2 EP 1215391 A2 EP1215391 A2 EP 1215391A2 EP 01129703 A EP01129703 A EP 01129703A EP 01129703 A EP01129703 A EP 01129703A EP 1215391 A2 EP1215391 A2 EP 1215391A2
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EP
European Patent Office
Prior art keywords
housing
pump
module
module according
pump module
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Withdrawn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
EP01129703A
Other languages
German (de)
English (en)
Other versions
EP1215391A3 (fr
Inventor
Roger Potschin
Thomas Goettel
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 EP1215391A2 publication Critical patent/EP1215391A2/fr
Publication of EP1215391A3 publication Critical patent/EP1215391A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means

Definitions

  • the invention relates to a single cylinder pump module for a Fuel injection system of an internal combustion engine that defined in more detail in the preamble of claim 1 Art.
  • Pump-line-nozzle-injection systems for diesel fuel used.
  • These are modular high pressure injection systems, that for each cylinder of an internal combustion engine have their own pump module that has a High pressure fuel injection line with an associated one Nozzle module is connectable.
  • Nozzle module for general information regarding pump-line-nozzle-injection systems exemplarily referred to the publication "Diesel Injection Technology at a glance ", Bosch technical briefing No. 1987 722038, 3rd edition 1998, p. 49.
  • Electromagnetic valve actuators build comparatively large, however, what in the cramped Space that is usually found in modern motor vehicles rule, is disadvantageous.
  • common Solenoid valves only between two switching positions, namely open and closed, to be switched whatever the desire according to individual adjustability of the timing of the injection opposes.
  • the invention now provides for a generic pump module before that the actuator one with the valve member includes piezoelectric lifting unit in actuating connection.
  • Piezo actuators take up much less space than electromagnetic valve actuators and therefore come the Demand for a small size of the pump module.
  • piezo actuators can be continuously between adjust their end positions so that in the fuel injection line directed fuel flow and thus the rate of fuel injected is continuously changing can be.
  • This allows individual shaping the timing of the injection, i.e. a so-called "rate shaping", and above all a condition-dependent one Adjustment of the injection process.
  • a small radial size of the pump module can be achieved if the piezoelectric lifting unit with essentially parallel to the housing axis of the module housing or below a small acute angle to this Stroke direction can be mounted on the module housing. This applies especially when the module housing is axially elongated and the piezoelectric lifting unit in the area of an axial Front side of the module housing is mountable on this.
  • a particularly slim design of the pump module results itself when the piezoelectric lifting unit essentially within a virtual axial envelope cylinder of the module housing is arranged. Due to the small size of the piezoelectric lifting unit it is easily possible also the line connection in the area of the axial end face to arrange the module housing.
  • the manufacturing costs for the pump module can be particularly high advantageous embodiment of the invention thereby reduced be that the module housing two separately manufactured, has firmly connected housing body, which with opposite contact surfaces axially abut each other, one of the housing bodies with the Pump chamber is executed and the other housing body with the valve chamber. That way the valve chamber separate from that containing the pump chamber Housing body are made.
  • the two housing bodies can be releasably connected to one another be so that in the event of defects in the pump module not the entire Pump module must be replaced, but parts of it can be exchanged.
  • the multi-part structure of the module housing enables the Valve chamber and / or the pump chamber from the contact surface to incorporate their respective housing bodies into them.
  • the valve chamber is particularly easy to manufacture, if it comes from an axial bore in the contact surface of its housing body is formed.
  • the stroke of the piezoelectric lifting unit for a direct Actuation of the valve element is generally not sufficient it is recommended that in the module housing one in the power transmission path between the piezoelectric Lifting unit and the valve member arranged, the actuating stroke of the piezoelectric lifting unit hydraulic Power transmission line or hydraulic coupling is trained. Due to the short hydraulic transmission line can be a very stiff, low vibration Coupling between the piezoelectric lifting unit and the Valve organ can be achieved, which is a very precise Allows valve control. In addition, the hydraulic Power transmission path a directional diversion of Stroke direction of the piezoelectric lifting unit are effected, so that there is great freedom in positioning the control valve assembly and the actuator inside the pump module.
  • the pump module shown in Figure 1 is part of a modular built pump-line-nozzle-diesel injection system for a motor vehicle internal combustion engine and is not described in detail illustrated manner in an installation opening of an engine block of the internal combustion engine used and fixed therein.
  • This pump model includes one generally designated 10 High pressure piston pump, the pump piston 12 in a cylinder bore 14 of a module housing 16 of the pump module and in this cylinder bore 14 by means of a a camshaft of the internal combustion engine coupled cam follower drive 18 in the direction of a housing axis forming cylinder axis 20 is movable up and down.
  • the nozzle module contains an in an injection nozzle projecting a combustion chamber of the internal combustion engine as well as one under the pressure of the fuel injection line delivered fuel opening, otherwise however, the injector is closed.
  • module housing 16 branches off from the conveyor channel 24 low-pressure return channel 28 indicated by dashed lines, which to the outside in a manner not shown of the module housing 16 leads and there with one to the fuel source leading fuel return line connectable is.
  • a control valve 30 allows the return channel 28 optionally to release or block completely or partially.
  • the control valve is at the delivery stroke of the pump piston 12 30 closed and accordingly the return channel 28 blocked, the fuel delivered by the piston pump 10 compressed and under high pressure via the conveyor channel 24 passed into the fuel injection line.
  • this Control valve 30, on the other hand, is at least partially open, flows depending on the degree of opening of the control valve 30 Part of the fuel expelled from the pump work space 22 from the return channel 28 under low pressure. Appropriate control of the control valve 30 can thus set the rate of fuel injected as needed and their chronological course are designed.
  • a valve actuator 32 which, as a stroke generator, has a lifting body 34 made of piezoelectric material which, when activated by an electronic control unit (not shown) of the injection system, carries out lifting movements in an axis-parallel stroke direction 36.
  • the lifting body 34 is preferably formed by a layer composite of a plurality of piezo material layers which are arranged one above the other along the lifting direction 36 and are each electrically contacted. It is coupled to a piston 38, which is accommodated in a cylindrical bore 40 of the module housing 16 so as to be movable in the stroke direction 36.
  • the piston 38 forms an input part of the stroke of the Lifting body 34 translating, so enlarging and thus a hydraulic coupler representing a power transmission link 42, the output part of one in a cylindrical Valve chamber 44 reciprocating as a spool formed valve body 46 of the control valve 30 is formed.
  • the module housing 16 has two separately manufactured, axially juxtaposed housing body 48, 50, which face one another in an axis-normal separating plane 52 axial contact surfaces 54, 56 abut each other.
  • the two of a metallic material, preferably Steel, manufactured body 48, 50 are detachable Firmly connected to each other, for example by means of a union nut 58, although it is not excluded the housing bodies 48, 50 e.g. inseparable by welding connect to.
  • the cylinder bore 14 receiving the pump piston 12 is completely contained in the housing body 48. It ends axially in front of the parting plane 52 and is remote from the parting plane Axial end face of the housing body 48 incorporated into this.
  • valve chamber 44 with the valve body 46 completely housed in the other housing body 50, to which the valve actuator 32 is also attached.
  • the conveyor channel 24 runs from the one housing body 48 over the parting plane 52 into the other housing body 50.
  • valve chamber 44 of the control valve 30 from the contact surface 56 of the housing body 50 forth as an axially parallel blind bore in this is incorporated.
  • the valve body 46 is in front of the Connection of the two housing bodies 48, 50 simultaneously with one Valve spring 60 inserted into this blind hole.
  • the Valve spring 60 tensions valve body 46 into an open position before in the fuel from the delivery channel 24 over an annular space 62 surrounding the valve chamber 44 on one Control edge 64 of the valve chamber 44 over into the return channel 28 can flow.
  • the valve body 46 becomes axial in front of the control edge 64 moves what the flow connection between conveyor channel 24th and return channel 28 interrupts.
  • the bore 40 receiving the piston 38 is also from the contact surface 56 of the housing body 50 axially parallel incorporated into this.
  • a connecting channel 66 connects the bore 40 with the blind bore forming the valve chamber 44.
  • the connecting channel 66 is between the contact surfaces 54, 56 of the two housing bodies 48, 50.
  • the contact surface 56 is preferably used of the housing body 50, for example, a channel-shaped one Machined recess, which holes 40 and 44th cuts.
  • connection channel 66 and the end surface of the valve body near the parting line 46 delimited space within the valve chamber 44 are filled with a hydraulic fluid and form such a hydraulic power transmission path of the lifting coupler 42 between the piston 38 and the valve body 46. Due to the different size of the hydraulically effective Surfaces of the piston 38 and the valve body 46 is a small stroke of the piston 38 into a much larger one Stroke of the valve body 46 implemented.
  • the connecting channel 66 enables a directional change the lifting action of the lifting body 34 e.g. as in the present Embodiment 180 degrees, the great freedom with a view to arranging the Control valve 30 allowed within the module housing 16.
  • a spacer nose 68 formed on the valve body 46 prevents that the hydraulically effective end surface of the valve body 46 in its open position by the valve spring 60 pressed against the contact surface 54 of the housing body 48 is lost and thus the effect of hydraulic pressure goes.
  • FIG. 3 and 4 differs differs from the first embodiment essentially in that that the valve body 46a is not axially parallel, but is installed normal to the axis, and the valve chamber 44a accordingly from the outside of the module housing 16a forth substantially perpendicular to the axis 20a in the module housing 16a is drilled. To the outside is the valve chamber 44a closed by a screwed plug 72a which the valve body 46a is in its open position supported with the spacer 68.
  • valve actuator 32a is slight with an axis 20a inclined lifting direction 36a of its lifting body 34a on the Module housing 16a mounted, but what about the total slim design of the pump module does not change anything significant.
  • the module housing can in this second embodiment have a one-piece housing body that both the cylinder bore 14a for the pump piston 12a as also contains the valve chamber 44a and also the valve actuator 32a wears. Nevertheless, there is also a split here of the module housing 16a similar to the first embodiment conceivable, as it is by the dashed parting plane 52a is indicated in Figure 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP01129703A 2000-12-16 2001-12-13 Module de pompe à cylindre unique pour un système d'injection de combustible d'un moteur à combustion interne Withdrawn EP1215391A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000162966 DE10062966A1 (de) 2000-12-16 2000-12-16 Einzelzylinder-Pumpmodul für ein Kraftstoffeinspritzsystem einer Verbrennungsmaschine
DE10062966 2000-12-16

Publications (2)

Publication Number Publication Date
EP1215391A2 true EP1215391A2 (fr) 2002-06-19
EP1215391A3 EP1215391A3 (fr) 2004-05-06

Family

ID=7667568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01129703A Withdrawn EP1215391A3 (fr) 2000-12-16 2001-12-13 Module de pompe à cylindre unique pour un système d'injection de combustible d'un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP1215391A3 (fr)
DE (1) DE10062966A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610427A (en) * 1984-04-17 1986-09-09 Nippon Soken, Inc. Piezoelectric control valve for fuel injector of internal combustion engine
JP2636410B2 (ja) * 1989-03-27 1997-07-30 トヨタ自動車株式会社 内燃機関用燃料供給ポンプ制御装置
DE4227851A1 (de) * 1992-08-22 1994-02-24 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
US5373828A (en) * 1992-09-11 1994-12-20 Lucas Industries Public Limited Company Fuel injection system
GB2289313B (en) * 1994-05-13 1998-09-30 Caterpillar Inc Fluid injector system
GB9810327D0 (en) * 1998-05-15 1998-07-15 Lucas Ind Plc Fuel system and pump suitable for use therein
DE19835494C2 (de) * 1998-08-06 2000-06-21 Bosch Gmbh Robert Pumpe-Düse-Einheit
DE19939451A1 (de) * 1999-08-20 2000-11-02 Bosch Gmbh Robert Aggregat zur Einspritzung von Kraftstoff
GB9923823D0 (en) * 1999-10-09 1999-12-08 Lucas Industries Ltd Fuel injector
DE10023960A1 (de) * 2000-05-16 2001-11-22 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
""Dieseleinspritztechnik im Überblick"", BOSCH-TECHNISCHE UNTERRICHTUNG, pages: 49, 1987

Also Published As

Publication number Publication date
EP1215391A3 (fr) 2004-05-06
DE10062966A1 (de) 2002-07-18

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