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EP2205855B1 - Compact injection device - Google Patents

Compact injection device Download PDF

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Publication number
EP2205855B1
EP2205855B1 EP08804690A EP08804690A EP2205855B1 EP 2205855 B1 EP2205855 B1 EP 2205855B1 EP 08804690 A EP08804690 A EP 08804690A EP 08804690 A EP08804690 A EP 08804690A EP 2205855 B1 EP2205855 B1 EP 2205855B1
Authority
EP
European Patent Office
Prior art keywords
injection device
fuel
pump
piston
suction jet
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.)
Not-in-force
Application number
EP08804690A
Other languages
German (de)
French (fr)
Other versions
EP2205855A1 (en
Inventor
Joerg Heyse
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 EP2205855A1 publication Critical patent/EP2205855A1/en
Application granted granted Critical
Publication of EP2205855B1 publication Critical patent/EP2205855B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0041—Means for damping pressure pulsations
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump
    • 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
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • 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
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools

Definitions

  • the present invention relates to an injection device with a fuel pump, a pressure regulator, an injector, an aerator and a suction jet pump in a compact design.
  • Injectors are known in the prior art in various configurations. Especially for cost and space reasons require small internal combustion engines, which have only one or only two cylinders and a small displacement, independent solutions. Areas of use of such small internal combustion engines are, for example, two-wheelers, tricycles or lawn mowers, etc.
  • Known injection devices usually comprise in a tank a high-pressure pump with a pressure regulator, wherein the high-pressure pump injects fuel at a predetermined pressure into a duct, e.g. a rail or similar, promotes.
  • an injector is arranged, which injects fuel injected into a suction pipe or directly into a combustion chamber by a control device.
  • injectors are very expensive and especially expensive, so that they also make small internal combustion engines very expensive.
  • an electronic control fuel injection device in which an injector is disposed near a pump piston. Further, in this case, a pre-pressure valve is provided for exerting an admission pressure on the fuel in an initial phase of a pressure stroke of the piston in the return line of the fuel to the tank.
  • the admission valve evacuates a part of the fuel located in a pressure chamber in the return line. In this way, in particular the formation of vapor bubbles in the injector can be reduced.
  • the structure is relatively complicated and the device takes up a large amount of space.
  • a suction jet pump for filling a pot, which is connected upstream of a fuel pump.
  • the fuel is directed by means of the suction jet pump from the tank into the pot.
  • the suction jet pump is driven by a outgoing from the pressure side of the fuel pump return flow.
  • the Liquid level in the pot raised to a liquid level in the tank, so that when sucking the fuel from the pot, there is a higher inlet pressure in the intake pipe. This reduces the risk of vapor bubble formation in the supply line to the fuel pump.
  • this solution is also very expensive and expensive.
  • the injection device according to the invention with the features of claim 1 has the advantage that it has a very compact structure. Furthermore, the injection device according to the invention can be produced in a particularly simple and cost-effective manner and the formation of vapor bubbles in the fuel supply line can be avoided. As a result, the injection device according to the invention can be used in particular in small internal combustion engines, e.g. in two-wheelers or lawn mowers or the like, are used.
  • the injection device comprises a fuel pump, a pressure regulator for controlling an injection pressure, an injector, an aerator and a suction jet pump, consisting of a motive nozzle and a diffuser.
  • the fuel pump, the pressure regulator, the injector and the air actuator are an integral part of an injection module.
  • the injection module is very compact and physically small and can be completely pre-assembled.
  • the suction jet pump only has to be connected to the corresponding connection of the injection module.
  • the four integral components of the injection module are preferably arranged in a common housing of the injection module.
  • the suction jet pump ensures that in the injection module, the formation of vapor bubbles is prevented, so that damage to the injection module and the metering of incorrect amounts of fuel can be avoided.
  • the injection device according to the invention has a compact injection module and in addition a suction jet pump, so that a trouble-free operation of the fuel-conveying components is ensured and the formation of vapor bubbles can be avoided.
  • the suction jet pump is also an integral part of the injection module.
  • the compact injection module comprises five components, namely the fuel pump, the pressure regulator, the injector, the aerator and the ejector.
  • the suction jet pump can be particularly easily integrated be that the diffuser and the motive nozzle are arranged completely in the housing of the injector.
  • the injection device comprises exactly one actuator, which simultaneously actuates the fuel pump and the aerator.
  • a separate actuator for the aerator or the fuel pump can be dispensed with, so that the number of components is significantly reduced.
  • this also results in a cost reduction.
  • the only actuator of the injector assumes the function of the pump drive and, secondly, the function of the actuator for the air actuator.
  • the only actuator of the injection device is preferably a magnetic actuator with exactly one coil and exactly one armature. This allows a particularly simple and inexpensive construction can be realized.
  • the tank is disposed in the vehicle at a higher position than the suction jet pump.
  • a higher pressure level in the suction jet pump can also be realized.
  • the injection device comprises a return line which recirculates pressurized fuel from a pressure space to the ejector pump, more precisely to the motive nozzle.
  • the pressure chamber may be a pumping chamber of the piston pump or a pre-pressure chamber.
  • the fuel pump comprises an antechamber, which is arranged after the suction jet pump.
  • the fuel is pressurizable to a predetermined value.
  • a check valve is arranged between the admission pressure chamber and the suction jet pump.
  • the check valve opens only when a predetermined opening pressure is reached by the suction jet pump. Furthermore, the check valve ensures that fuel can not flow from the admission pressure chamber back into the suction jet pump.
  • the fuel pump comprises a piston, which is designed as a stepped piston with a first piston surface and a second piston surface.
  • the first piston surface is larger than the second piston surface.
  • the first piston surface is arranged in the pre-chamber and the second piston surface is arranged in the pumping chamber.
  • a through hole is arranged in the piston of the fuel pump, which connects the front pressure chamber with the pumping chamber.
  • a check valve is arranged, which prevents backflow of the fuel from the pumping chamber into the admission pressure chamber.
  • the fuel pump comprises a first piston member, a second piston member and a diaphragm.
  • the membrane is arranged in the direction of movement of the piston elements between the first and second piston element.
  • the two piston elements are arranged on a common axis.
  • the membrane forms a wall region of the admission pressure chamber. This allows a simple structure.
  • the suction jet pump is preferably made of a plastic material.
  • the suction jet pump can be produced for example by means of injection molding and also simultaneously with other components of the injection device, e.g. the housing by injection molding, are produced.
  • a compressible pressure buffer device for example a bubble filled with gas, is arranged in the admission pressure chamber.
  • a pressure buffer medium for example, a compressible medium disposed in the bubble, e.g. Air, serve.
  • FIGS. 1 and 2 a small motor 1 with an injection device according to the invention according to a first embodiment described in detail.
  • FIG. 1 schematically shows the structure of the small motor 1, which is designed as a single-cylinder engine.
  • the small engine 1 comprises a cylinder 3, a reciprocating piston 4, a control unit 5 and a tank 6.
  • the tank 6 is connected to an injection module 2 via a fuel supply line 6a.
  • a suction jet pump 40 is arranged directly on the injection module 2.
  • a return line 32 goes from the injection module 2 back to the suction jet pump 40.
  • the tank 6 is arranged above the injection module 2.
  • the injection module 2 is shown very schematically and comprises a fuel pump, a pressure regulator, an injector and an air actuator, so that the injection module 2 is constructed very compact.
  • the small engine 1 further comprises a throttle valve 7, which is arranged in a suction pipe 8.
  • a spark plug 9 On the cylinder 3, a spark plug 9, an intake valve 10 and an exhaust valve 11 is further arranged.
  • the reference numeral 12 designates a bypass line for air, which branches off from the intake manifold 8 air from a region in the flow direction of the air in front of the throttle valve 7 and leads directly to the integrated in the injection module 2 aerator. An outlet of the bypass line 12 lies directly adjacent to the injector of the injection module. 2
  • the small engine 1 further comprises an exhaust pipe 13, which is released or closed by the exhaust valve 11. Further, an oxygen sensor 14 is provided on the exhaust pipe 13 which is connected to the control unit 5, and the control unit 5 is further provided with a cooling water sensor 15, an oil temperature sensor 16 and a sensor unit 17 for detection a throttle position, a temperature in the intake manifold 8 and a pressure in the intake manifold 8.
  • the control unit 5 controls the injection device 2 on the basis of the received signals.
  • the injector according to the invention thus comprises, as in FIG. 2 shown, an injection module 2 with a fuel pump 20a, a pressure regulator 20b, an injector 20c and an air actuator 20d, which are arranged in a common housing 25, and can be designed to be particularly compact and compact.
  • the injection device according to the invention can be produced very inexpensively and in particular be pre-assembled in advance as a complete injection module 2, so that it only needs to be installed in the small engine 1 as a compact assembly.
  • the integration of the four items fuel pump, pressure regulator, injector and air actuator thus a simple and inexpensive manufacturability is guaranteed.
  • the fuel pump and the air actuator are actuated by a common actuator.
  • a suction jet pump 40 is provided.
  • the injection device 2 according to the invention can be used, for example, in small motors for two-wheelers or lawn mowers.
  • the injection module comprises a coil 21 and an armature 22 cooperating with the coil 21.
  • the armature 22 is as shown FIG. 2 can be seen, with a first piston member 23 and a second piston member 24 fixedly connected.
  • the first piston part 23 is assigned to the air actuator 20 d and releases at a seat 12 a a cross section of the bypass line 12 or closes the bypass line 12.
  • the injection module 2 comprises a housing 25, which is made of a plurality of individual parts 25a, 25b, 25c, 25d.
  • the individual parts of the housing take on different functions.
  • the seat 12a is formed on the item 25 of the housing.
  • the injection module comprises a first admission pressure chamber 26, a second admission pressure chamber 27 and a pumping chamber 28.
  • the first admission pressure chamber 26 and the pumping chamber 28 are in contact with the second piston part 24.
  • the second piston part 24 forms a part of the fuel pump 20a.
  • the second piston part 24 is formed as a stepped piston and has a first piston surface 24a and a second piston surface 24b.
  • the first piston surface 24a is in contact with the fuel in the first admission pressure chamber 26 and the second piston surface is in contact with the fuel in the pumping chamber 28.
  • the second piston part 24 is thereby guided by guide areas, which are formed on the housing parts 25c and 25d.
  • the first admission pressure chamber 26 is connected via a line 30 to the second admission pressure chamber 27, wherein a first check valve 29 is arranged in the line. Furthermore, the second admission pressure chamber 27 is connected to the pumping chamber 28 via a second check valve 31. In a known manner, fuel can then be injected into the suction pipe 8 from the pumping chamber 28 via a check valve of the injector 20c.
  • the second admission pressure chamber 27 is further connected via a line 32 to the suction jet pump 40.
  • the pressure regulator 20b is arranged in the line 32.
  • the pressure regulator 20b of this embodiment includes a throttle 35.
  • a check valve may be provided.
  • the suction jet pump 40 is arranged in the supply line 6a from the tank 6. How out FIG. 2 can be seen, the suction jet pump 40 comprises only a driving nozzle 41 and a diffuser 42. This allows the suction jet pump 40 is very simple and inexpensive, for example, as a plastic injection molded part, are provided.
  • the suction jet pump 40 is arranged in a curved line section 6a ', so that the fuel emerging from the motive nozzle 41 exits the tank 6 parallel to the flow direction of the fuel. How farther FIG. 2 it can be seen, the end of the diffuser 42 is connected to the first pre-pressure chamber 26, wherein between the first pre-pressure chamber 26 and the diffuser 42 is still a third check valve 43 is arranged.
  • the suction jet pump 40 is arranged directly on the housing.
  • the second piston part 24 is reset by means of a return spring 34, which is supported on a chamber wall 33 of the first admission pressure chamber 32 and presses against the first piston surface 24a.
  • reference numeral 36 denotes an air-filled cavity. It should be noted that the cavity 36 need not necessarily be provided, but it is also possible that, for example, the return element for the second piston member 24 may be disposed in the cavity, so that the return element is not located in the fuel.
  • the function of the injection device according to the invention according to the first embodiment is as follows.
  • the coil 21 is energized, so that the armature 22 moves in the direction of the arrow A. Since the armature 22 is fixedly connected to the first piston part 23 and the second piston part 24, the two piston parts move simultaneously with the armature 22 in the direction of the arrow A. This opens the air actuator 20d.
  • an increase in pressure takes place in the first admission pressure chamber 26, since the first piston surface 24a is moved further into the first admission pressure chamber 26. Due to this increase in pressure, the first check valve 29 opens so that pressurized fuel flows into the second admission pressure chamber 27.
  • the fuel located in the pumping chamber 28 is pressurized via the second piston surface 24b, the injector 20c automatically opening from a predetermined pressure level and injecting fuel into the intake manifold 8.
  • the second pre-pressure chamber 27 is connected via the line 32 to the suction jet pump 40, fuel is at a predetermined pressure to the suction jet pump 40 at.
  • the energization of the coil 21 is released again and the armature 22 by means of the return spring 34 which resets the second piston member 24, also returned to its original position.
  • this also applies to the first piston part 23 fixedly connected to the armature 22, so that the air actuator 20d is likewise closed.
  • the provision of the second piston member 24 simultaneously causes a suction of new fuel.
  • fuel is sucked from the second admission pressure chamber 27 via the second check valve 31 into the pumping chamber 28 and, on the other hand, fuel is sucked out of the tank 6 by opening the third check valve 43.
  • the suction jet pump 40 is provided.
  • the suction jet pump 40 provides the drive of the suction jet pump via the drive nozzle 41. For this comes to the coming of the tank volume flow of the fuel nor an additional volume flow through the motive nozzle 41.
  • the motive nozzle 41 is thereby supplied under pressure fuel from the second admission pressure chamber 27 via the line 32 ,
  • the fuel from the motive nozzle leaves it at a higher speed and due to internal friction results in a turbulent flow, which enters the diffuser 42.
  • the diffuser there is a steady pressure increase, so that it can be avoided that vapor bubbles can arise in the fuel.
  • the third check valve 43 opens, so that the fuel can be supplied to the first admission pressure chamber 26.
  • the end of the diffuser is arranged directly on the housing 25.
  • the suction jet pump 40 can be arranged completely in the injection module 2. This allows an even more compact design can be realized. It should also be noted that the drive nozzle 41, the diffuser 42 and the 90 ° curved line section 6a 'can be made of a plastic material in one step, for example by plastic injection molding. As a result, the suction jet pump 40 can be provided in a particularly cost-effective manner.
  • the injection valve additionally has to circulate the volume flow necessary for driving the suction jet pump 40 via the line 32.
  • the pressure energy transferred to this additional volume flow is then used to raise the pressure in the intake area above the tank pressure so that the formation of vapor bubbles in the intake area can be avoided with certainty.
  • the tank 6 is additionally arranged slightly above the injection module 2, so that this also results in a certain pressure increase in the intake area.
  • a particularly high pressure in the first admission pressure chamber 26 is achieved if a ratio of the injected volume flow to the intake volume flow (circulated volume flow plus injected volume flow) is relatively small. That is, the recirculated volume flow is much larger than the injected volume flow.
  • a diameter in the driving nozzle 41 can be selected to be relatively small in order to achieve a high pressure in the first admission pressure chamber.
  • FIG. 3 an injection device with an injection module 2 according to a second embodiment described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
  • the injection module of the second embodiment is even more compact.
  • the fuel pump 20a of the second embodiment comprises a diaphragm 50 and a piston 51 exposed in a cylinder.
  • a through-hole 52 which connects a pre-pressure chamber 26 to a pumping chamber 28.
  • a first check valve 29 is arranged in the through hole 52.
  • the membrane 50 is firmly fixed to the housing 25 of the injection module and forms a chamber wall of the prechamber 26.
  • the fuel pump 20a of the second embodiment comprises a plunger 53 which is fixedly connected to the armature 22.
  • the plunger 23 and a piston part 23 of the air actuator 20d are fixedly connected to the armature 22 and therefore move together.
  • a return spring 54 is also provided.
  • the function of the injection module 2 according to the second embodiment is as follows. If an injection of fuel to be made, the coil 21 is energized, so that the armature 22 moves together with the plunger 53 and the piston member 23 in the direction of arrow A. As a result, the plunger 53 comes into contact with the diaphragm 50, which is pressed into the admission pressure chamber 26. This results in an increase in pressure in the pre-pressure chamber 26, wherein an upper limit of the pressure is defined by the first check valve 29. When the diaphragm 50 has traveled a small distance in the direction of the arrow A, it comes into contact with a contact region 51a on the exposed piston 51, so that the membrane is moved together with the exposed piston 51.
  • the piston 51 is moved against the spring force of the return spring 34, and the pressure in the pumping chamber 28 increases.
  • the injector 20 c opens, so that fuel can be injected into the suction pipe 8, as indicated by the arrow B.
  • a part of the volume flow is not injected into the suction tube, but guided via the line 23 to the suction jet pump 40.
  • the suction jet pump 40 functions as in the first embodiment, so that by the pressure return and the suction jet pump formation steam bubbles in the intake of the fuel pump is avoided.
  • the second embodiment thus has a reduced number of parts and can be provided very compact and small-sized. This makes it particularly suitable for small machines.
  • a common actuator simultaneously actuates both the fuel pump 20a and the air actuator 20d.
  • the actuator in particular only one electrical connection for the actuator has to be provided, which according to the invention always simultaneously actuates the air actuator 20d and the fuel pump 20a.
  • an additional air supply via the bypass line 12 is always achieved simultaneously with the fuel injection, so that a better mixing of the fuel in the supplied air is achieved in the mixture preparation in the intake manifold 8.
  • the suction jet pump 40 surely allows the occurrence of vapor bubbles in the suction region of the fuel pump in operation.

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

Abstract

The present invention relates to an injection device, comprising a fuel pump (20a), a pressure regulator (20b), an injector (20c), and an air actuator (20d), characterized in that the fuel pump (20a), the pressure reducer (20b), the injector (20c), and the air actuator (2Od) are integral parts of an injection module (2) and the injection device further comprises a suction jet pump (40), via which fuel is fed, wherein the suction jet pump (40) is connected to a tank (6) and the fuel pump (20a).

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine Einspritzvorrichtung mit einer Kraftstoffpumpe, einem Druckregler, einem Injektor, einem Luftsteller und einer Saugstrahlpumpe in einer kompakten Bauweise.The present invention relates to an injection device with a fuel pump, a pressure regulator, an injector, an aerator and a suction jet pump in a compact design.

Einspritzvorrichtungen sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Insbesondere aus Kosten- und Bauraumgründen erfordern Kleinbrennkraftmaschinen, welche nur einen oder nur zwei Zylinder und einen kleinen Hubraum aufweisen, eigenständige Lösungen. Einsatzgebiete derartiger Kleinbrennkraftmaschinen sind beispielsweise Zweiräder, Dreiräder oder Rasenmäher usw. Bekannte Einspritzvorrichtungen umfassen üblicherweise in einem Tank eine Hochdruckpumpe mit einem Druckregler, wobei die Hochdruckpumpe Kraftstoff mit einem vorbestimmten Druck in eine Leitung, z.B. ein Rail o.ä., fördert. Am Ende der Leitung ist ein Injektor angeordnet, welcher gesteuert durch eine Steuereinrichtung Kraftstoff in ein Saugrohr oder direkt in einen Brennraum einspritzt. Derartige Einspritzeinrichtungen sind jedoch sehr aufwendig und insbesondere teuer, so dass sie Kleinbrennkraftmaschinen ebenfalls sehr teuer machen.Injectors are known in the prior art in various configurations. Especially for cost and space reasons require small internal combustion engines, which have only one or only two cylinders and a small displacement, independent solutions. Areas of use of such small internal combustion engines are, for example, two-wheelers, tricycles or lawn mowers, etc. Known injection devices usually comprise in a tank a high-pressure pump with a pressure regulator, wherein the high-pressure pump injects fuel at a predetermined pressure into a duct, e.g. a rail or similar, promotes. At the end of the line, an injector is arranged, which injects fuel injected into a suction pipe or directly into a combustion chamber by a control device. However, such injectors are very expensive and especially expensive, so that they also make small internal combustion engines very expensive.

Aus der EP 1 340 906 B1 ist eine Kraftstoffeinspritzvorrichtung mit elektronischer Steuerung bekannt, bei der ein Injektor nahe einem Pumpenkolben angeordnet ist. Ferner ist hierbei ein Vordruckventil zum Ausüben eines Vordrucks auf den Kraftstoff in einer Anfangsphase eines Druckhubes des Kolbens in der Rückleitung des Kraftstoffs zum Tank vorgesehen. Das Vordruckventil evakuiert dabei einen Teil des in einer Druckkammer befindlichen Kraftstoffs in die Rückleitung. Hierdurch kann insbesondere die Bildung von Dampfblasen im Injektor reduziert werden. Allerdings ist der Aufbau relativ kompliziert und die Vorrichtung nimmt einen großen Bauraum ein.From the EP 1 340 906 B1 For example, an electronic control fuel injection device is known in which an injector is disposed near a pump piston. Further, in this case, a pre-pressure valve is provided for exerting an admission pressure on the fuel in an initial phase of a pressure stroke of the piston in the return line of the fuel to the tank. The admission valve evacuates a part of the fuel located in a pressure chamber in the return line. In this way, in particular the formation of vapor bubbles in the injector can be reduced. However, the structure is relatively complicated and the device takes up a large amount of space.

Alternativ ist es auch möglich, eine Saugstrahlpumpe zum Befüllen eines Topfes, welcher einer Kraftstoffpumpe vorgeschaltet ist, zu verwenden. Hierbei wird der Kraftstoff mittels der Saugstrahlpumpe aus dem Tank in den Topf geleitet. Die Saugstrahlpumpe wird durch einen von der Druckseite der Kraftstoffpumpe ausgehenden Rücklaufstrom angetrieben. Hierbei wird der Flüssigkeitspegel im Topf gegenüber einem Flüssigkeitspegel im Tank angehoben, so dass beim Ansaugen des Kraftstoffs aus dem Topf ein höherer Vordruck in der Ansaugleitung herrscht. Dadurch wird die Gefahr einer Dampfblasenbildung in der Zuleitung zur Kraftstoffpumpe reduziert. Allerdings ist diese Lösung ebenfalls sehr aufwendig und teuer.Alternatively, it is also possible to use a suction jet pump for filling a pot, which is connected upstream of a fuel pump. Here, the fuel is directed by means of the suction jet pump from the tank into the pot. The suction jet pump is driven by a outgoing from the pressure side of the fuel pump return flow. Here is the Liquid level in the pot raised to a liquid level in the tank, so that when sucking the fuel from the pot, there is a higher inlet pressure in the intake pipe. This reduces the risk of vapor bubble formation in the supply line to the fuel pump. However, this solution is also very expensive and expensive.

Von daher sind die bekannten Lösungen zur Vermeidung von Dampfblasen aufgrund ihrer Herstellkosten nicht für einen Einsatz in kostengünstigen Kleinfahrzeugen geeignet.Therefore, the known solutions to avoid vapor bubbles due to their manufacturing costs are not suitable for use in low-cost small vehicles.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Einspritzvorrichtung mit den Merkmalen des Patentanspruchs 1 weist demgegenüber den Vorteil auf, dass sie einen sehr kompakten Aufbau aufweist. Ferner kann die erfindungsgemäße Einspritzvorrichtung besonders einfach und kostengünstig hergestellt werden und die Bildung von Dampfblasen in der Kraftstoffzuleitung vermieden werden. Dadurch kann die erfindungsgemäße Einspritzvorrichtung insbesondere bei Kleinbrennkraftmaschinen, z.B. bei Zweirädern oder Rasenmähern o.ä., verwendet werden. Dies wird erfindungsgemäß dadurch erreicht, dass die Einspritzvorrichtung eine Kraftstoffpumpe, einen Druckregler zur Regelung eines Einspritzdrucks, einen Injektor, einen Luftsteller und eine Saugstrahlpumpe, bestehend aus einer Treibdüse und einem Diffusor, umfasst. Die Kraftstoffpumpe, der Druckregler, der Injektor und der Luftsteller sind dabei integraler Bestandteil eines Einspritzmoduls. Das Einspritzmodul ist dabei sehr kompakt und kleinbauend und kann komplett vormontiert werden. Dadurch muss die Saugstrahlpumpe lediglich an den entsprechenden Anschluss des Einspritzmoduls angeschlossen werden. Die vier integralen Bauteile des Einspritzmoduls sind dabei vorzugsweise in einem gemeinsamen Gehäuse des Einspritzmoduls angeordnet. Die Saugstrahlpumpe stellt dabei sicher, dass im Einspritzmodul die Entstehung von Dampfblasen verhindert wird, so dass Beschädigungen des Einspritzmoduls und die Zumessung von falschen Mengen an Kraftstoff vermieden werden können. Somit weist die erfindungsgemäße Einspritzvorrichtung ein kompaktes Einspritzmodul und zusätzlich eine Saugstrahlpumpe auf, so dass ein störungsfreier Betrieb der kraftstofffördernden Bauteile gewährleistet ist und die Bildung von Dampfblasen vermieden werden kann.The injection device according to the invention with the features of claim 1 has the advantage that it has a very compact structure. Furthermore, the injection device according to the invention can be produced in a particularly simple and cost-effective manner and the formation of vapor bubbles in the fuel supply line can be avoided. As a result, the injection device according to the invention can be used in particular in small internal combustion engines, e.g. in two-wheelers or lawn mowers or the like, are used. This is inventively achieved in that the injection device comprises a fuel pump, a pressure regulator for controlling an injection pressure, an injector, an aerator and a suction jet pump, consisting of a motive nozzle and a diffuser. The fuel pump, the pressure regulator, the injector and the air actuator are an integral part of an injection module. The injection module is very compact and physically small and can be completely pre-assembled. As a result, the suction jet pump only has to be connected to the corresponding connection of the injection module. The four integral components of the injection module are preferably arranged in a common housing of the injection module. The suction jet pump ensures that in the injection module, the formation of vapor bubbles is prevented, so that damage to the injection module and the metering of incorrect amounts of fuel can be avoided. Thus, the injection device according to the invention has a compact injection module and in addition a suction jet pump, so that a trouble-free operation of the fuel-conveying components is ensured and the formation of vapor bubbles can be avoided.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Besonders bevorzugt ist die Saugstrahlpumpe ebenfalls ein integraler Bestandteil des Einspritzmoduls. Somit umfasst das kompakte Einspritzmodul fünf Bauteile, nämlich die Kraftstoffpumpe, den Druckregler, den Injektor, den Luftsteller und die Saugstrahlpumpe. Hierdurch kann ein Platzbedarffür das Einspritzmodul minimiert werden und das komplette Einspritzmodul kann im voraus montiert werden. Die Saugstrahlpumpe kann besonders einfach dadurch integriert werden, dass der Diffusor und die Treibdüse vollständig im Gehäuse der Einspritzvorrichtung angeordnet sind.Particularly preferably, the suction jet pump is also an integral part of the injection module. Thus, the compact injection module comprises five components, namely the fuel pump, the pressure regulator, the injector, the aerator and the ejector. As a result, a space requirement for the injection module can be minimized and the complete injection module can be mounted in advance. The suction jet pump can be particularly easily integrated be that the diffuser and the motive nozzle are arranged completely in the housing of the injector.

Vorzugsweise umfasst die Einspritzvorrichtung genau einen Aktuator, welcher gleichzeitig die Kraftstoffpumpe und den Luftsteller betätigt. Dadurch kann insbesondere ein separater Aktuator für den Luftsteller bzw. die Kraftstoffpumpe entfallen, so dass die Bauteileanzahl signifikant reduziert wird. Hierdurch ergibt sich selbstverständlich auch eine Kostenreduktion. Somit übernimmt der einzige Aktuator der Einspritzvorrichtung erstens die Funktion des Pumpenantriebs und zweitens die Funktion des Stellantriebs für den Luftsteller.Preferably, the injection device comprises exactly one actuator, which simultaneously actuates the fuel pump and the aerator. As a result, in particular a separate actuator for the aerator or the fuel pump can be dispensed with, so that the number of components is significantly reduced. Of course, this also results in a cost reduction. Thus, the only actuator of the injector assumes the function of the pump drive and, secondly, the function of the actuator for the air actuator.

Der einzige Aktuator der Einspritzvorrichtung ist vorzugsweise ein Magnetaktuator mit genau einer Spule und genau einem Anker. Hierdurch kann ein besonders einfacher und kostengünstiger Aufbau realisiert werden.The only actuator of the injection device is preferably a magnetic actuator with exactly one coil and exactly one armature. This allows a particularly simple and inexpensive construction can be realized.

Vorzugsweise ist der Tank im Fahrzeug an einer höheren Position als die Saugstrahlpumpe angeordnet. Hierdurch kann ebenfalls ein höheres Druckniveau in der Saugstrahlpumpe realisiert werden.Preferably, the tank is disposed in the vehicle at a higher position than the suction jet pump. As a result, a higher pressure level in the suction jet pump can also be realized.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung umfasst die Einspritzvorrichtung eine Rückführleitung, welche unter Druck stehenden Kraftstoff von einem Druckraum zur Saugstrahlpumpe, genauer zur Treibdüse, zurückführt. Der Druckraum kann dabei eine Pumpkammer der Kolbenpumpe oder eine Vordruckkammer sein.According to a further preferred embodiment of the present invention, the injection device comprises a return line which recirculates pressurized fuel from a pressure space to the ejector pump, more precisely to the motive nozzle. The pressure chamber may be a pumping chamber of the piston pump or a pre-pressure chamber.

Besonders bevorzugt umfasst die Kraftstoffpumpe eine Vorkammer, welche nach der Saugstrahlpumpe angeordnet ist. In der Vorkammer ist der Kraftstoff auf einen vorbestimmten Wert unter Druck setzbar.Particularly preferably, the fuel pump comprises an antechamber, which is arranged after the suction jet pump. In the pre-chamber, the fuel is pressurizable to a predetermined value.

Besonders bevorzugt ist zwischen der Vordruckkammer und der Saugstrahlpumpe ein Rückschlagventil angeordnet. Das Rückschlagventil öffnet dabei erst, wenn durch die Saugstrahlpumpe ein vorbestimmter Öffnungsdruck erreicht ist. Ferner stellt das Rückschlagventil sicher, dass Kraftstoff nicht aus der Vordruckkammer zurück in die Saugstrahlpumpe strömen kann.Particularly preferably, a check valve is arranged between the admission pressure chamber and the suction jet pump. The check valve opens only when a predetermined opening pressure is reached by the suction jet pump. Furthermore, the check valve ensures that fuel can not flow from the admission pressure chamber back into the suction jet pump.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung umfasst die Kraftstoffpumpe einen Kolben, welcher als Stufenkolben mit einer ersten Kolbenfläche und einer zweiten Kolbenfläche ausgebildet ist. Dabei ist die erste Kolbenfläche größer als die zweite Kolbenfläche. Dadurch kann der Stufenkolben in zwei verschiednen Kammern unterschiedliche Drücke erzeugen.According to a further preferred embodiment of the present invention, the fuel pump comprises a piston, which is designed as a stepped piston with a first piston surface and a second piston surface. In this case, the first piston surface is larger than the second piston surface. As a result, the stepped piston can generate different pressures in two different chambers.

Vorzugsweise ist die erste Kolbenfläche in der Vorkammer angeordnet und die zweite Kolbenfläche ist in der Pumpkammer angeordnet.Preferably, the first piston surface is arranged in the pre-chamber and the second piston surface is arranged in the pumping chamber.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist im Kolben der Kraftstoffpumpe eine Durchgangsbohrung angeordnet, welche die Vorderdruckkammer mit der Pumpkammer verbindet. In der Durchgangsbohrung ist dabei ein Rückschlagventil angeordnet, welches ein Rückströmen des Kraftstoffs von der Pumpkammer in die Vordruckkammer verhindert. Durch diese Ausgestaltung des Kolbens kann insbesondere die Teilezahl der Kraftstoffpumpe signifikant reduziert werden, da keine separate Leitung oder kein zusätzliches Gehäuse für ein Rückschlagventil notwendig ist, da alles in dem Kolben integriert ist.According to a further preferred embodiment of the present invention, a through hole is arranged in the piston of the fuel pump, which connects the front pressure chamber with the pumping chamber. In the through hole while a check valve is arranged, which prevents backflow of the fuel from the pumping chamber into the admission pressure chamber. This configuration of the piston, in particular, the number of parts of the fuel pump can be significantly reduced because no separate line or no additional housing for a check valve is necessary because everything is integrated in the piston.

Gemäß einer anderen bevorzugten Ausgestaltung der vorliegenden Erfindung umfasst die Kraftstoffpumpe ein erstes Kolbenelement, ein zweites Kolbenelement und eine Membran. Die Membran ist dabei in Bewegungsrichtung der Kolbenelemente zwischen dem ersten und zweiten Kolbenelement angeordnet. Die beiden Kolbenelemente sind dabei auf einer gemeinsamen Achse angeordnet. Ferner bildet die Membran dabei einen Wandbereich der Vordruckkammer. Dies ermöglicht einen einfachen Aufbau.According to another preferred embodiment of the present invention, the fuel pump comprises a first piston member, a second piston member and a diaphragm. The membrane is arranged in the direction of movement of the piston elements between the first and second piston element. The two piston elements are arranged on a common axis. Furthermore, the membrane forms a wall region of the admission pressure chamber. This allows a simple structure.

Um eine möglichst kostengünstige Herstellbarkeit der Saugstrahlpumpe zu realisieren, ist die Saugstrahlpumpe vorzugsweise aus einem Kunststoffmaterial hergestellt. Dadurch kann die Saugstrahlpumpe beispielsweise mittels Spritzgießen hergestellt werden und auch gleichzeitig mit weiteren Bauteilen der Einspritzvorrichtung, z.B. dem Gehäuse durch Spritzgießen, hergestellt werden.In order to realize the most cost-effective manufacturability of the suction jet pump, the suction jet pump is preferably made of a plastic material. As a result, the suction jet pump can be produced for example by means of injection molding and also simultaneously with other components of the injection device, e.g. the housing by injection molding, are produced.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist in der Vordruckkammer eine kompressible Druckpuffereinrichtung, beispielsweise eine mit Gas gefüllte Blase, angeordnet. Durch das Druckpuffermedium in der Druckpuffereinrichtung kann eine erfolgte Druckerhöhung in der Vordruckkammer gehalten werden. Als Druckpuffermedium kann beispielsweise ein in der Blase angeordnetes kompressibles Medium, z.B. Luft, dienen.According to a further preferred embodiment of the present invention, a compressible pressure buffer device, for example a bubble filled with gas, is arranged in the admission pressure chamber. By the pressure buffer medium in the pressure buffer device, a pressure increase can be held in the pre-pressure chamber. As a pressure buffer medium, for example, a compressible medium disposed in the bubble, e.g. Air, serve.

Zeichnungdrawing

Nachfolgend werden bevorzugte Ausführungsbeispiele der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist:

Figur 1
eine schematische Ansicht eines Kleinmotors mit einer Einspritzvorrichtung gemäß einem ersten Ausführungsbeispiel der Erfindung,
Figur 2
eine schematische Schnittansicht eines Einspritzmoduls mit einer Saugstrahlpumpe gemäß dem ersten Ausführungsbeispiel, und
Figur 3
eine schematische Schnittansicht eines Einspritzmoduls mit einer Saugstrahlpumpe gemäß einem zweiten Ausführungsbeispiel der Erfindung.
Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:
FIG. 1
a schematic view of a small motor with an injection device according to a first embodiment of the invention,
FIG. 2
a schematic sectional view of an injection module with a suction jet pump according to the first embodiment, and
FIG. 3
a schematic sectional view of an injection module with a suction jet pump according to a second embodiment of the invention.

Bevorzugte Ausführungsformen der ErfindungPreferred embodiments of the invention

Nachfolgend wird unter Bezugnahme auf die Figuren 1 und 2 ein Kleinmotor 1 mit einer erfindungsgemäßen Einspritzvorrichtung gemäß einem ersten Ausführungsbeispiel im Detail beschrieben.The following is with reference to the FIGS. 1 and 2 a small motor 1 with an injection device according to the invention according to a first embodiment described in detail.

Figur 1 zeigt schematisch den Aufbau des Kleinmotors 1, welcher als Einzylindermotor ausgebildet ist. Der Kleinmotor 1 umfasst einen Zylinder 3, einen darin hin- und herbewegbaren Kolben 4, eine Steuereinheit 5 und einen Tank 6. Der Tank 6 ist über eine Kraftstoffzuleitung 6a mit einem Einspritzmodul 2 verbunden. Am Ende der Kraftstoffzuleitung ist eine Saugstrahlpumpe 40 unmittelbar am Einspritzmodul 2 angeordnet. Eine Rückführleitung 32 geht von dem Einspritzmodul 2 zurück zur Saugstrahlpumpe 40. Wie aus Figur 1 schematisch ersichtlich ist, ist der Tank 6 über dem Einspritzmodul 2 angeordnet. Dadurch läuft der Kraftstoff durch die Kraftstoffzuleitung 6a aufgrund der Schwerkraft zum Einspritzmodul 2, so dass dadurch schon eine leichte Druckerhöhung an der Saugstrahlpumpe erfolgt. Das Einspritzmodul 2 ist sehr schematisch dargestellt und umfasst eine Kraftstoffpumpe, einen Druckregler, einen Injektor und einen Luftsteller, so dass das Einspritzmodul 2 sehr kompakt aufgebaut ist. FIG. 1 schematically shows the structure of the small motor 1, which is designed as a single-cylinder engine. The small engine 1 comprises a cylinder 3, a reciprocating piston 4, a control unit 5 and a tank 6. The tank 6 is connected to an injection module 2 via a fuel supply line 6a. At the end of the fuel supply line, a suction jet pump 40 is arranged directly on the injection module 2. A return line 32 goes from the injection module 2 back to the suction jet pump 40. As out FIG. 1 schematically, the tank 6 is arranged above the injection module 2. As a result, the fuel passes through the fuel supply line 6a due to gravity to the injection module 2, so that thereby already a slight increase in pressure takes place at the suction jet pump. The injection module 2 is shown very schematically and comprises a fuel pump, a pressure regulator, an injector and an air actuator, so that the injection module 2 is constructed very compact.

Der Kleinmotor 1 umfasst ferner eine Drosselklappe 7, welche in einem Saugrohr 8 angeordnet ist. Am Zylinder 3 ist ferner eine Zündkerze 9, ein Einlassventil 10 und ein Auslassventil 11 angeordnet. Das Bezugszeichen 12 bezeichnet eine Bypassleitung für Luft, welche vom Saugrohr 8 Luft von einem Bereich in Strömungsrichtung der Luft vor der Drosselklappe 7 abzweigt und direkt zum in das Einspritzmodul 2 integrierten Luftsteller führt. Ein Auslass der Bypassleitung 12 liegt dabei unmittelbar benachbart zum Injektor des Einspritzmoduls 2.The small engine 1 further comprises a throttle valve 7, which is arranged in a suction pipe 8. On the cylinder 3, a spark plug 9, an intake valve 10 and an exhaust valve 11 is further arranged. The reference numeral 12 designates a bypass line for air, which branches off from the intake manifold 8 air from a region in the flow direction of the air in front of the throttle valve 7 and leads directly to the integrated in the injection module 2 aerator. An outlet of the bypass line 12 lies directly adjacent to the injector of the injection module. 2

Der Kleinmotor 1 umfasst ferner eine Abgasleitung 13, welche durch das Auslassventil 11 freigegeben bzw. verschlossen wird. Ferner ist ein Sauerstoffsensor 14 an der Abgasleitung 13 vorgesehen, welcher mit der Steuereinheit 5 verbunden ist und die Steuereinheit 5 ist ferner mit einem Kühlwassersensor 15, einem Öltemperatursensor 16 und einer Sensoreinheit 17 für die Erfassung einer Drosselposition, einer Temperatur im Saugrohr 8 und eines Drucks im Saugrohr 8 verbunden. Die Steuereinheit 5 steuert dabei anhand der erhaltenen Signale die Einspritzvorrichtung 2.The small engine 1 further comprises an exhaust pipe 13, which is released or closed by the exhaust valve 11. Further, an oxygen sensor 14 is provided on the exhaust pipe 13 which is connected to the control unit 5, and the control unit 5 is further provided with a cooling water sensor 15, an oil temperature sensor 16 and a sensor unit 17 for detection a throttle position, a temperature in the intake manifold 8 and a pressure in the intake manifold 8. The control unit 5 controls the injection device 2 on the basis of the received signals.

Die erfindungsgemäße Einspritzvorrichtung umfasst somit, wie in Figur 2 gezeigt, ein Einspritzmodul 2 mit einer Kraftstoffpumpe 20a, einem Druckregler 20b, einem Injektor 20c und einem Luftsteller 20d, welche in einem gemeinsamen Gehäuse 25 angeordnet sind, und kann besonders kompakt und kleinbauend ausgelegt werden. Ferner kann die erfindungsgemäße Einspritzvorrichtung sehr kostengünstig hergestellt werden und insbesondere schon im voraus als komplettes Einspritzmodul 2 vormontiert werden, so dass es lediglich in den Kleinmotor 1 als Kompaktbaugruppe eingebaut werden muss. Durch die Integration der vier Einzelteile Kraftstoffpumpe, Druckregler, Injektor und Luftsteller ist somit eine einfache und kostengünstige Herstellbarkeit gewährleistet. Die Kraftstoffpumpe und der Luftsteller werden dabei von einem gemeinsamen Aktuator betätigt. Zusätzlich ist eine Saugstrahlpumpe 40 vorgesehen. Dadurch kann die erfindungsgemäße Einspritzvorrichtung 2 beispielsweise in Kleinmotoren für Zweiräder oder Rasenmäher verwendet werden.The injector according to the invention thus comprises, as in FIG. 2 shown, an injection module 2 with a fuel pump 20a, a pressure regulator 20b, an injector 20c and an air actuator 20d, which are arranged in a common housing 25, and can be designed to be particularly compact and compact. Furthermore, the injection device according to the invention can be produced very inexpensively and in particular be pre-assembled in advance as a complete injection module 2, so that it only needs to be installed in the small engine 1 as a compact assembly. The integration of the four items fuel pump, pressure regulator, injector and air actuator thus a simple and inexpensive manufacturability is guaranteed. The fuel pump and the air actuator are actuated by a common actuator. In addition, a suction jet pump 40 is provided. As a result, the injection device 2 according to the invention can be used, for example, in small motors for two-wheelers or lawn mowers.

Wie in Figur 2 gezeigt, umfasst das Einspritzmodul eine Spule 21 sowie einen mit der Spule 21 zusammenwirkenden Anker 22. Der Anker 22 ist, wie aus Figur 2 ersichtlich ist, mit einem ersten Kolbenteil 23 und einem zweiten Kolbenteil 24 fest verbunden. Dadurch werden bei einer Bewegung 22 die beiden Kolbenteile 23, 24 gemeinsam mitbewegt. Der erste Kolbenteil 23 ist dem Luftsteller 20d zugeordnet und gibt an einem Sitz 12a einen Querschnitt der Bypassleitung 12 frei bzw. verschließt die Bypassleitung 12.As in FIG. 2 As shown, the injection module comprises a coil 21 and an armature 22 cooperating with the coil 21. The armature 22 is as shown FIG. 2 can be seen, with a first piston member 23 and a second piston member 24 fixedly connected. As a result, in a movement 22, the two piston parts 23, 24 are moved together. The first piston part 23 is assigned to the air actuator 20 d and releases at a seat 12 a a cross section of the bypass line 12 or closes the bypass line 12.

Wie weiter aus Figur 2 ersichtlich ist, umfasst das Einspritzmodul 2 ein Gehäuse 25, welches aus mehreren Einzelteilen 25a, 25b, 25c, 25d hergestellt ist. Für eine kostengünstige Herstellung übernehmen die Einzelteile des Gehäuses dabei verschiedene Funktionen. Beispielsweise ist am Einzelteil 25 des Gehäuses der Sitz 12a ausgebildet. Weiter umfasst das Einspritzmodul eine erste Vordruckkammer 26, eine zweite Vordruckkammer 27 und eine Pumpkammer 28. Die erste Vordruckkammer 26 und die Pumpkammer 28 sind dabei mit dem zweiten Kolbenteil 24 in Kontakt. Das zweite Kolbenteil 24 bildet dabei einen Teil der Kraftstoffpumpe 20a. Wie aus Figur 2 ersichtlich ist, ist das zweite Kolbenteil 24 als Stufenkolben ausgebildet und weist eine erste Kolbenfläche 24a und eine zweite Kolbenfläche 24b auf. Die erste Kolbenfläche 24a befindet sich mit dem in der ersten Vordruckkammer 26 befindlichen Kraftstoff in Kontakt und die zweite Kolbenfläche befindet sich mit dem in der Pumpkammer 28 befindlichen Kraftstoff in Kontakt. Das zweite Kolbenteil 24 wird dabei durch Führungsbereiche, welche an den Gehäuse- Einzelteilen 25c und 25d gebildet sind, geführt.How farther FIG. 2 it can be seen, the injection module 2 comprises a housing 25, which is made of a plurality of individual parts 25a, 25b, 25c, 25d. For cost-effective production, the individual parts of the housing take on different functions. For example, the seat 12a is formed on the item 25 of the housing. Furthermore, the injection module comprises a first admission pressure chamber 26, a second admission pressure chamber 27 and a pumping chamber 28. The first admission pressure chamber 26 and the pumping chamber 28 are in contact with the second piston part 24. The second piston part 24 forms a part of the fuel pump 20a. How out FIG. 2 it can be seen, the second piston part 24 is formed as a stepped piston and has a first piston surface 24a and a second piston surface 24b. The first piston surface 24a is in contact with the fuel in the first admission pressure chamber 26 and the second piston surface is in contact with the fuel in the pumping chamber 28. The second piston part 24 is thereby guided by guide areas, which are formed on the housing parts 25c and 25d.

Die erste Vordruckkammer 26 ist über eine Leitung 30 mit der zweiten Vordruckkammer 27 verbunden, wobei in der Leitung ein erstes Rückschlagventil 29 angeordnet ist. Ferner ist die zweite Vordruckkammer 27 über ein zweites Rückschlagventil 31 mit der Pumpkammer 28 verbunden. In bekannter Weise kann dann aus der Pumpkammer 28 über ein Rückschlagventil des Injektors 20c Kraftstoff in das Saugrohr 8 eingespritzt werden.The first admission pressure chamber 26 is connected via a line 30 to the second admission pressure chamber 27, wherein a first check valve 29 is arranged in the line. Furthermore, the second admission pressure chamber 27 is connected to the pumping chamber 28 via a second check valve 31. In a known manner, fuel can then be injected into the suction pipe 8 from the pumping chamber 28 via a check valve of the injector 20c.

Die zweite Vordruckkammer 27 ist ferner über eine Leitung 32 mit der Saugstrahlpumpe 40 verbunden. Dabei ist in der Leitung 32 der Druckregler 20b angeordnet. Der Druckregler 20b dieses Ausführungsbeispiels umfasst dabei eine Drossel 35. Alternativ kann statt der Drossel auch ein Rückschlagventil vorgesehen werden. Die Saugstrahlpumpe 40 ist in der Zuleitung 6a vom Tank 6 angeordnet. Wie aus Figur 2 ersichtlich ist, umfasst die Saugstrahlpumpe 40 lediglich eine Treibdüse 41 und einen Diffusor 42. Dadurch kann die Saugstrahlpumpe 40 sehr einfach und kostengünstig, beispielsweise als Kunststoffspritzteil, bereitgestellt werden. Die Saugstrahlpumpe 40 ist dabei in einem gekrümmten Leitungsabschnitt 6a' angeordnet, so dass der aus der Treibdüse 41 austretende Kraftstoff parallel zur Strömungsrichtung des Kraftstoffs vom Tank 6 austritt. Wie weiter aus Figur 2 ersichtlich ist, ist das Ende des Diffusors 42 mit der ersten Vordruckkammer 26 verbunden, wobei zwischen der ersten Vordruckkammer 26 und dem Diffusor 42 noch ein drittes Rückschlagventil 43 angeordnet ist. Die Saugstrahlpumpe 40 ist dabei unmittelbar am Gehäuse angeordnet.The second admission pressure chamber 27 is further connected via a line 32 to the suction jet pump 40. In this case, the pressure regulator 20b is arranged in the line 32. The pressure regulator 20b of this embodiment includes a throttle 35. Alternatively, instead of the throttle and a check valve may be provided. The suction jet pump 40 is arranged in the supply line 6a from the tank 6. How out FIG. 2 can be seen, the suction jet pump 40 comprises only a driving nozzle 41 and a diffuser 42. This allows the suction jet pump 40 is very simple and inexpensive, for example, as a plastic injection molded part, are provided. In this case, the suction jet pump 40 is arranged in a curved line section 6a ', so that the fuel emerging from the motive nozzle 41 exits the tank 6 parallel to the flow direction of the fuel. How farther FIG. 2 it can be seen, the end of the diffuser 42 is connected to the first pre-pressure chamber 26, wherein between the first pre-pressure chamber 26 and the diffuser 42 is still a third check valve 43 is arranged. The suction jet pump 40 is arranged directly on the housing.

Der zweite Kolbenteil 24 wird mittels einer Rückstellfeder 34 zurückgestellt, welche sich an einer Kammerwand 33 der ersten Vordruckkammer 32 abstützt und gegen die erste Kolbenfläche 24a drückt. Ferner bezeichnet das Bezugszeichen 36 einen mit Luft gefüllten Hohlraum. Hierbei sei angemerkt, dass der Hohlraum 36 nicht zwingend vorgesehen sein muss, es jedoch auch möglich ist, dass beispielsweise das Rückstellelement für das zweite Kolbenteil 24 auch im Hohlraum angeordnet sein kann, so dass das Rückstellelement nicht im Kraftstoff befindlich ist.The second piston part 24 is reset by means of a return spring 34, which is supported on a chamber wall 33 of the first admission pressure chamber 32 and presses against the first piston surface 24a. Further, reference numeral 36 denotes an air-filled cavity. It should be noted that the cavity 36 need not necessarily be provided, but it is also possible that, for example, the return element for the second piston member 24 may be disposed in the cavity, so that the return element is not located in the fuel.

Die Funktion der erfindungsgemäßen Einspritzvorrichtung gemäß dem ersten Ausführungsbeispiel ist dabei wie folgt. Wenn Kraftstoff in das Saugrohr 8 eingespritzt werden soll, wird die Spule 21 bestromt, so dass sich der Anker 22 in Richtung des Pfeils A bewegt. Da der Anker 22 fest mit dem ersten Kolbenteil 23 und dem zweiten Kolbenteil 24 verbunden ist, bewegen sich die beiden Kolbenteile gleichzeitig mit dem Anker 22 in Richtung des Pfeils A. Dadurch öffnet der Luftsteller 20d. Gleichzeitig erfolgt in der ersten Vordruckkammer 26 eine Druckerhöhung, da die erste Kolbenfläche 24a weiter in die erste Vordruckkammer 26 hineinbewegt wird. Aufgrund dieser Druckerhöhung öffnet das erste Rückschlagventil 29, so dass unter Druck stehender Kraftstoff in die zweite Vordruckkammer 27 strömt. Ferner wird über die zweite Kolbenfläche 24b der sich in der Pumpkammer 28 befindliche Kraftstoff unter Druck gesetzt, wobei der Injektor 20c ab einem vorbestimmten Druckniveau selbstständig öffnet und Kraftstoff in das Saugrohr 8 einspritzt. Da ferner die zweite Vordruckkammer 27 über die Leitung 32 mit der Saugstrahlpumpe 40 verbunden ist, liegt Kraftstoff mit einem vorbestimmten Druck auch an der Saugstrahlpumpe 40 an.The function of the injection device according to the invention according to the first embodiment is as follows. When fuel is to be injected into the suction pipe 8, the coil 21 is energized, so that the armature 22 moves in the direction of the arrow A. Since the armature 22 is fixedly connected to the first piston part 23 and the second piston part 24, the two piston parts move simultaneously with the armature 22 in the direction of the arrow A. This opens the air actuator 20d. At the same time, an increase in pressure takes place in the first admission pressure chamber 26, since the first piston surface 24a is moved further into the first admission pressure chamber 26. Due to this increase in pressure, the first check valve 29 opens so that pressurized fuel flows into the second admission pressure chamber 27. Furthermore, the fuel located in the pumping chamber 28 is pressurized via the second piston surface 24b, the injector 20c automatically opening from a predetermined pressure level and injecting fuel into the intake manifold 8. There Further, the second pre-pressure chamber 27 is connected via the line 32 to the suction jet pump 40, fuel is at a predetermined pressure to the suction jet pump 40 at.

Nach einer Beendigung der Einspritzung wird die Bestromung der Spule 21 wieder aufgehoben und der Anker 22 mittels der Rückstellfeder 34, welche das zweite Kolbenteil 24 zurückstellt, ebenfalls in seine Ausgangsposition zurückgestellt. Dies gilt selbstverständlich auch für das fest mit dem Anker 22 verbundene erste Kolbenteil 23, so dass der Luftsteller 20d ebenfalls verschlossen wird. Die Rückstellung des zweiten Kolbenteils 24 bewirkt gleichzeitig eine Ansaugung von neuem Kraftstoff. Zum einen wird Kraftstoff aus der zweiten Vordruckkammer 27 über das zweite Rückschlagventil 31 in die Pumpkammer 28 angesaugt und andererseits wird Kraftstoff durch Öffnen des dritten Rückschlagventils 43 aus dem Tank 6 angesaugt. Um bei dieser Ansaugung zu vermeiden, dass Dampfblasen entstehen, ist die Saugstrahlpumpe 40 vorgesehen. Die Saugstrahlpumpe 40 stellt über die Treibdüse 41 den Antrieb der Saugstrahlpumpe bereit. Als Antrieb dient dabei der Treibstrahl aus der Treibdüse 41. Hierzu kommt zu dem aus dem Tank kommenden Volumenstrom des Kraftstoffs noch ein zusätzlicher Volumenstrom über die Treibdüse 41. Der Treibdüse 41 wird dabei unter Druck stehender Kraftstoff aus der zweiten Vordruckkammer 27 über die Leitung 32 zugeführt. Der Kraftstoff aus der Treibdüse verlässt diese mit einer höheren Geschwindigkeit und aufgrund von innerer Reibung ergibt sich eine turbulente Strömung, welche in den Diffusor 42 eintritt. Im Diffusor erfolgt eine stetige Druckerhöhung, so dass vermieden werden kann, dass Dampfblasen im Kraftstoff entstehen können. Bei einem bestimmten Druckniveau öffnet dabei das dritte Rückschlagventil 43, so dass der Kraftstoff in die erste Vordruckkammer 26 zugeführt werden kann. Wie aus Figur 4 ersichtlich ist, ist das Ende des Diffusors unmittelbar am Gehäuse 25 angeordnet. Es sei angemerkt, dass es grundsätzlich auch möglich ist, dass die Saugstrahlpumpe 40 vollständig im Einspritzmodul 2 angeordnet ist. Dadurch kann ein noch kompakterer Aufbau realisiert werden. Ferner sei angemerkt, dass die Treibdüse 41, der Diffusor 42 sowie der um 90° gekrümmte Leitungsabschnitt 6a' aus einem Kunststoffmaterial in einem Schritt, beispielsweise durch Kunststoffspritzen, hergestellt werden können. Dadurch kann die Saugstrahlpumpe 40 besonders kostengünstig bereitgestellt werden.After completion of the injection, the energization of the coil 21 is released again and the armature 22 by means of the return spring 34 which resets the second piston member 24, also returned to its original position. Of course, this also applies to the first piston part 23 fixedly connected to the armature 22, so that the air actuator 20d is likewise closed. The provision of the second piston member 24 simultaneously causes a suction of new fuel. On the one hand, fuel is sucked from the second admission pressure chamber 27 via the second check valve 31 into the pumping chamber 28 and, on the other hand, fuel is sucked out of the tank 6 by opening the third check valve 43. In order to avoid vapor bubbles in this suction, the suction jet pump 40 is provided. The suction jet pump 40 provides the drive of the suction jet pump via the drive nozzle 41. For this comes to the coming of the tank volume flow of the fuel nor an additional volume flow through the motive nozzle 41. The motive nozzle 41 is thereby supplied under pressure fuel from the second admission pressure chamber 27 via the line 32 , The fuel from the motive nozzle leaves it at a higher speed and due to internal friction results in a turbulent flow, which enters the diffuser 42. In the diffuser there is a steady pressure increase, so that it can be avoided that vapor bubbles can arise in the fuel. At a certain pressure level, the third check valve 43 opens, so that the fuel can be supplied to the first admission pressure chamber 26. As can be seen from FIG. 4, the end of the diffuser is arranged directly on the housing 25. It should be noted that in principle it is also possible for the suction jet pump 40 to be arranged completely in the injection module 2. This allows an even more compact design can be realized. It should also be noted that the drive nozzle 41, the diffuser 42 and the 90 ° curved line section 6a 'can be made of a plastic material in one step, for example by plastic injection molding. As a result, the suction jet pump 40 can be provided in a particularly cost-effective manner.

Somit muss das Einspritzventil neben dem zur Einspritzung nutzbaren Volumenstrom zusätzlich noch den zum Antrieb der Saugstrahlpumpe 40 notwendigen Volumenstrom über die Leitung 32 umwälzen. Die diesem zusätzlichen Volumenstrom übertragene Druckenergie wird dann dazu genutzt, den Druck im Ansaugbereich über den Tankdruck anzuheben, so dass mit Sicherheit die Bildung von Dampfblasen im Ansaugbereich vermieden werden kann. Zur weiteren Druckerhöhung ist zusätzlich noch der Tank 6 etwas oberhalb des Einspritzmoduls 2 angeordnet, so dass sich auch dadurch im Ansaugbereich eine gewisse Druckerhöhung ergibt. Ein besonders hoher Druck in der ersten Vordruckkammer 26 wird erreicht, wenn ein Verhältnis des eingespritzten Volumenstroms zum angesaugten Volumenstrom (umgewälzter Volumenstrom plus eingespritzter Volumenstrom) relativ klein ist. D.h., der umgewälzte Volumenstrom ist sehr viel größer als der eingespritzte Volumenstrom. Alternativ kann auch ein Durchmesser in der Treibdüse 41 relativ klein gewählt werden, um einen hohen Druck in der ersten Vordruckkammer zu erreichen.Thus, in addition to the usable flow rate for injection, the injection valve additionally has to circulate the volume flow necessary for driving the suction jet pump 40 via the line 32. The pressure energy transferred to this additional volume flow is then used to raise the pressure in the intake area above the tank pressure so that the formation of vapor bubbles in the intake area can be avoided with certainty. For further pressure increase, the tank 6 is additionally arranged slightly above the injection module 2, so that this also results in a certain pressure increase in the intake area. A particularly high pressure in the first admission pressure chamber 26 is achieved if a ratio of the injected volume flow to the intake volume flow (circulated volume flow plus injected volume flow) is relatively small. That is, the recirculated volume flow is much larger than the injected volume flow. Alternatively, a diameter in the driving nozzle 41 can be selected to be relatively small in order to achieve a high pressure in the first admission pressure chamber.

Nachfolgend wird unter Bezugnahme auf Figur 3 eine Einspritzvorrichtung mit einem Einspritzmodul 2 gemäß einem zweiten Ausführungsbeispiel im Detail beschrieben. Gleiche bzw. funktional gleiche Teile sind dabei mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet.The following is with reference to FIG. 3 an injection device with an injection module 2 according to a second embodiment described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment.

Im Unterschied zum ersten Ausführungsbeispiel ist das Einspritzmodul des zweiten Ausführungsbeispiels noch kompakter aufgebaut. Insbesondere kann beim zweiten Ausführungsbeispiel auf eine zweite Vordruckkammer sowie eine separate Leitung verzichtet werden. Wie in Figur 3 gezeigt, umfasst die Kraftstoffpumpe 20a des zweiten Ausführungsbeispiels eine Membran 50 sowie einen in einem Zylinder freiliegenden Kolben 51. Im freiliegenden Kolben 51 ist eine Durchgangsbohrung 52 vorgesehen, welche eine Vordruckkammer 26 mit einer Pumpkammer 28 verbindet. In der Durchgangsbohrung 52 ist dabei ein erstes Rückschlagventil 29 angeordnet. Die Membran 50 ist am Gehäuse 25 des Einspritzmoduls fest fixiert und bildet eine Kammerwand der Vorkammer 26. Weiter umfasst die Kraftstoffpumpe 20a des zweiten Ausführungsbeispiels einen Stößel 53, welcher fest mit dem Anker 22 verbunden ist. Der Stößel 23 sowie ein Kolbenteil 23 des Luftstellers 20d sind fest mit dem Anker 22 verbunden und bewegen sich daher gemeinsam. Zur Rückstellung des Ankers 22 ist ferner eine Rückstellfeder 54 vorgesehen.In contrast to the first embodiment, the injection module of the second embodiment is even more compact. In particular, can be dispensed with in the second embodiment, a second pre-pressure chamber and a separate line. As in FIG. 3 2, the fuel pump 20a of the second embodiment comprises a diaphragm 50 and a piston 51 exposed in a cylinder. In the exposed piston 51, there is provided a through-hole 52 which connects a pre-pressure chamber 26 to a pumping chamber 28. In the through hole 52, a first check valve 29 is arranged. The membrane 50 is firmly fixed to the housing 25 of the injection module and forms a chamber wall of the prechamber 26. Further, the fuel pump 20a of the second embodiment comprises a plunger 53 which is fixedly connected to the armature 22. The plunger 23 and a piston part 23 of the air actuator 20d are fixedly connected to the armature 22 and therefore move together. To return the armature 22, a return spring 54 is also provided.

Die Funktion des Einspritzmoduls 2 gemäß dem zweiten Ausführungsbeispiel ist dabei wie folgt. Wenn eine Einspritzung von Kraftstoff vorgenommen werden soll, wird die Spule 21 bestromt, so dass sich der Anker 22 mitsamt dem Stößel 53 und dem Kolbenteil 23 in Richtung des Pfeils A bewegt. Dadurch kommt der Stößel 53 mit der Membran 50 in Kontakt, welche in die Vordruckkammer 26 gedrückt wird. Dadurch ergibt sich eine Druckerhöhung in der Vordruckkammer 26, wobei eine Obergrenze des Drucks durch das erste Rückschlagventil 29 definiert ist. Wenn die Membran 50 eine kleine Wegstrecke in Richtung des Pfeils A zurückgelegt hat, kommt diese mit einem Kontaktbereich 51a am freiliegenden Kolben 51 in Berührung, so dass an die Membran gemeinsam mit dem freiliegenden Kolben 51 bewegt wird. Hierdurch wird der Kolben 51 entgegen der Federkraft der Rückstellfeder 34 bewegt, und der Druck in der Pumpkammer 28 steigt an. Sobald ein vorbestimmtes Druckniveau erreicht ist, öffnet der Injektor 20c, so dass Kraftstoff, wie durch den Pfeil B angedeutet, in das Saugrohr 8 eingespritzt werden kann. Wie beim ersten Ausführungsbeispiel wird ein Teil des Volumenstroms dabei nicht in das Saugrohr eingespritzt, sondern über die Leitung 23 zur Saugstrahlpumpe 40 geführt. Die Saugstrahlpumpe 40 funktioniert dabei wie im ersten Ausführungsbeispiel, so dass durch die Druckrückführung und die Saugstrahlpumpe eine Bildung von Dampfblasen im Ansaugbereich der Kraftstoffpumpe vermieden wird. Das zweite Ausführungsbeispiel weist somit eine reduzierte Teileanzahl auf und kann sehr kompakt und kleinbauend bereitgestellt werden. Dadurch ist es besonders für Kleinmaschinen geeignet.The function of the injection module 2 according to the second embodiment is as follows. If an injection of fuel to be made, the coil 21 is energized, so that the armature 22 moves together with the plunger 53 and the piston member 23 in the direction of arrow A. As a result, the plunger 53 comes into contact with the diaphragm 50, which is pressed into the admission pressure chamber 26. This results in an increase in pressure in the pre-pressure chamber 26, wherein an upper limit of the pressure is defined by the first check valve 29. When the diaphragm 50 has traveled a small distance in the direction of the arrow A, it comes into contact with a contact region 51a on the exposed piston 51, so that the membrane is moved together with the exposed piston 51. As a result, the piston 51 is moved against the spring force of the return spring 34, and the pressure in the pumping chamber 28 increases. As soon as a predetermined pressure level is reached, the injector 20 c opens, so that fuel can be injected into the suction pipe 8, as indicated by the arrow B. As in the first embodiment, a part of the volume flow is not injected into the suction tube, but guided via the line 23 to the suction jet pump 40. The suction jet pump 40 functions as in the first embodiment, so that by the pressure return and the suction jet pump formation steam bubbles in the intake of the fuel pump is avoided. The second embodiment thus has a reduced number of parts and can be provided very compact and small-sized. This makes it particularly suitable for small machines.

Zu allen beschriebenen Ausführungsbeispielen sei angemerkt, dass ein gemeinsamer Aktuator gleichzeitig sowohl die Kraftstoffpumpe 20a als auch den Luftsteller 20d betätigt. Damit muss insbesondere nur ein elektrischer Anschluss für den Aktuator vorgesehen werden, welcher erfindungsgemäß immer gleichzeitig den Luftsteller 20d und die Kraftstoffpumpe 20a betätigt. Dadurch wird immer gleichzeitig mit der Kraftstoffeinspritzung auch eine zusätzliche Luftzufuhr über die Bypassleitung 12 erreicht, so dass bei der Gemischaufbereitung im Saugrohr 8 auch eine bessere Vermischung des Kraftstoffs in der zugeführten Luft erreicht wird. Ferner ermöglicht das Vorsehen der Saugstrahlpumpe 40 sicher das Auftreten von Dampfblasen im Ansaugbereich der Kraftstoffpumpe im Betrieb.For all of the described embodiments, it should be noted that a common actuator simultaneously actuates both the fuel pump 20a and the air actuator 20d. Thus, in particular only one electrical connection for the actuator has to be provided, which according to the invention always simultaneously actuates the air actuator 20d and the fuel pump 20a. As a result, an additional air supply via the bypass line 12 is always achieved simultaneously with the fuel injection, so that a better mixing of the fuel in the supplied air is achieved in the mixture preparation in the intake manifold 8. Further, the provision of the suction jet pump 40 surely allows the occurrence of vapor bubbles in the suction region of the fuel pump in operation.

Claims (15)

  1. Injection device, comprising a fuel pump (20a), a pressure regulator (20b), an injector (20c) and a pneumatic actuator (20d), characterized in that the fuel pump (20a), the pressure regulator (20b), the injector (20c) and the pneumatic actuator (20d) are an integral constituent part of an injection module (2), a common actuator (21, 22) actuating the fuel pump (20a) and the pneumatic actuator (20d), and, furthermore, the injection device comprising a suction jet pump (40), via which fuel is fed from a tank (6), the suction jet pump (40) being connected to the tank (6) and the fuel pump (20a).
  2. Injection device according to Claim 1, characterized in that the suction jet pump (40) is an integral constituent part of the injection module (2).
  3. Injection device according to one of the preceding claims, comprising precisely one actuator (21, 22) which at the same time actuates the fuel pump (20a) and the pneumatic actuator (20d).
  4. Injection device according to one of the preceding claims, characterized in that a tank (6) is arranged over the suction jet pump (40).
  5. Injection device according to one of the preceding claims, characterized in that a return line (32) conducts fuel from a pressure region of the fuel pump (20a) to the suction jet pump (40).
  6. Injection device according to Claim 5, characterized in that a throttle (35) or a non-return valve is arranged in the return line (32).
  7. Injection device according to one of the preceding claims, characterized in that a pilot pressure chamber (26), in which the fuel can be buffer-stored at a predefined pilot pressure, is arranged downstream of the suction jet pump (40) in the flow direction.
  8. Injection device according to Claim 7, characterized in that a non-return valve (43) is arranged between the suction jet pump (40) and the pilot pressure chamber (26).
  9. Injection device according to one of the preceding claims, characterized in that a piston (24) of the fuel pump (20a) is formed as a step piston with a first piston face (24a) and a second piston face (24b), the first piston face (24a) being larger than the second piston face (24b).
  10. Injection device according to Claim 9, characterized in that the first piston face (24a) is arranged in the pilot pressure chamber (26) and the second piston face (24b) is arranged in a pump chamber (28).
  11. Injection device according to one of Claims 7 to 10, characterized in that a through hole (52) is arranged in the piston (51) of the fuel pump (20a), which through hole (52) connects the pilot pressure chamber (26) to the pump chamber (28), a non-return valve (39) being arranged in the through hole (52).
  12. Injection device according to one of the preceding Claims 7 to 11, characterized in that the fuel pump (20a) comprises a diaphragm (50) and a first piston (53) and a second piston (51), the diaphragm (50) being arranged between the first and second pistons and forming a wall region of the pilot pressure chamber (26).
  13. Injection device according to one of the preceding claims, characterized in that the suction jet pump (40) is produced from plastic.
  14. Injection device according to one of the preceding claims, characterized in that a compressible pressure buffer device, in particular a bladder which is filled with gas, is arranged in the pilot pressure chamber (26) of the fuel pump (20a).
  15. Internal combustion engine, comprising exactly one or exactly two cylinders and an injection device according to one of the preceding claims.
EP08804690A 2007-10-23 2008-09-24 Compact injection device Not-in-force EP2205855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007050547A DE102007050547A1 (en) 2007-10-23 2007-10-23 Compact injector
PCT/EP2008/062786 WO2009053201A1 (en) 2007-10-23 2008-09-24 Compact injection device

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EP2205855A1 EP2205855A1 (en) 2010-07-14
EP2205855B1 true EP2205855B1 (en) 2011-06-15

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AT (1) ATE513124T1 (en)
DE (1) DE102007050547A1 (en)
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DE102009003081A1 (en) * 2009-05-13 2010-11-18 Robert Bosch Gmbh Compact injector with inward opening injector
JP6421767B2 (en) * 2016-02-12 2018-11-14 株式会社デンソー Fuel pump control device

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JP4431268B2 (en) 2000-11-17 2010-03-10 株式会社ミクニ Electronically controlled fuel injection device
CN100439700C (en) * 2004-12-08 2008-12-03 浙江飞亚电子有限公司 An integrated oil supply unit
US7458364B2 (en) * 2005-08-05 2008-12-02 Scion-Sprays Limited Internal combustion engine having a fuel injection system

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DE102007050547A1 (en) 2009-04-30
ATE513124T1 (en) 2011-07-15
CN101835971A (en) 2010-09-15
EP2205855A1 (en) 2010-07-14

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