WO2018122007A1 - Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine - Google Patents

Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine Download PDF

Info

Publication number
WO2018122007A1
WO2018122007A1 PCT/EP2017/083029 EP2017083029W WO2018122007A1 WO 2018122007 A1 WO2018122007 A1 WO 2018122007A1 EP 2017083029 W EP2017083029 W EP 2017083029W WO 2018122007 A1 WO2018122007 A1 WO 2018122007A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
cylinder
combustion engine
internal combustion
pump unit
Prior art date
Application number
PCT/EP2017/083029
Other languages
German (de)
French (fr)
Inventor
Luigi Fiorentino
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 WO2018122007A1 publication Critical patent/WO2018122007A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • 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
    • F02M59/462—Delivery valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves
    • F04B1/0456—Cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Definitions

  • the present invention relates to a pump set for supplying fuel, preferably diesel, to an internal combustion engine.
  • the present invention relates to a pump assembly of the type comprising a pump body, at least one cylinder formed in the pump body, a piston displaceably disposed in the cylinder, and an actuator for urging the piston in an intake stroke
  • Suction of the fuel into the cylinder and during a compression stroke for compressing the fuel contained in the cylinder to move comprises.
  • the pump assembly further includes a suction line for aspirating the fuel into the cylinder, a suction valve mounted along the suction line to selectively control the supply of the fuel to the cylinder, a pressure line for pushing the fuel to the internal combustion engine, and a pressure valve along the pressure line is attached to the
  • the pressure line is coaxial with a longitudinal axis of the cylinder, and in it is slidably disposed a closure part of the pressure valve.
  • the closure part of the pressure valve is thus axially facing the piston and is movable between an open position and a closed position of the pressure line.
  • the closure member has a substantially spherical coupling portion that is configured to fluidly couple with a substantially frusto-conical coupling portion of the pressure line when the closure member is in its closed position.
  • the known pump units of the above-mentioned type have some disadvantages, mainly due to the fact that during its compression stroke inside the cylinder, the piston generates pressure waves between the closure part of the pressure valve and the piston parallel to the longitudinal axis of the cylinder at least during the initial phase of the cylinder
  • Object of this invention is to provide a pump unit for supplying
  • Fuel preferably diesel, to perform an internal combustion engine, which does not have the disadvantages described above and is simple and inexpensive in the execution.
  • a pump set for supplying fuel, preferably diesel, to an internal combustion engine according to the appended claims.
  • Figure 1 is a first schematic sectional view, with omitted for clarity parts, a preferred embodiment of
  • Figure 2 is a second schematic sectional view, with parts omitted for clarity, of the pump unit of Figure 1;
  • Figure 3 is a schematic sectional view of a detail of the pump unit of Figures 1 and 2;
  • Figure 4 is a schematic sectional view of a first variant of the detail of Figure 3 and
  • FIG. 5 shows a schematic sectional view of a second variant of the detail from FIG. 3.
  • 1 denotes a pump unit for supplying fuel, preferably diesel, to an internal combustion engine (not shown) as a whole.
  • the pump unit 1 comprises a piston pump 2 for supplying the fuel to said internal combustion engine (not shown) and a prefeed pump 3, for example a gear pump, for supplying the fuel to the pump 2.
  • the pump unit 1 comprises a pump body comprising a housing 4 provided with a central bore 5 having a longitudinal axis 6 and at least one lateral bore 7 (normally a plurality of bores 7 extending uniformly about the axis 6) are distributed), which has a longitudinal axis 8 which is transverse to the axis 6 and extending radially from the bore 5 to the outside of the housing 4.
  • Each bore 7 is closed by a head part 9 which is arranged in contact with the housing 4 and has an extension 10 which projects coaxially with the axis 8 into the bore 7.
  • the head portion 9 has a central bore 11 formed through the head portion 9 coaxial with the axis 8 and includes a constricted intermediate portion 12 disposed between two flared portions 13a, 13b, the portion 13a facing the bore 5 and a cylinder 14 of the piston pump 2 defined.
  • a piston 15 is slidably movable under the thrust of an actuator 16 with a rectilinear reciprocating motion comprising a suction stroke for sucking the fuel into the cylinder 14 and a compression stroke for compressing the fuel contained in the cylinder 14 ,
  • the device 16 comprises a tubular sleeve 17 which is slidably disposed in the bore 7 coaxial with the axis 8, extends around the cylinder 14 and has an annular inner flange 18 which protrudes radially from an inner surface of the sleeve 17 and this sleeve 17 in two cylindrical sections 19, 20 divides, wherein the portion 19 of the bore 5 faces.
  • the device 16 further comprises a plunger 21 comprising a substantially cylindrical coupling block 22 which is held by excess in the portion 19, is arranged in contact with the flange 18 and a
  • Plunger roller 23 carries.
  • the roller 23 protrudes from the block 22 to the bore 5 and is rotatably coupled to the block 22 to be in relation to this block 22 by its own
  • the flange 18 carries an annular plate 25 which extends around the piston 15, is inserted into the portion 20 of the sleeve 17 coaxial with the axis 8 and an outer peripheral edge which faces axially the flange 18, and an inner peripheral edge axially facing a bottom of the piston 15.
  • the device 16 further comprises a compression spring 26, which between the
  • Extension 10 and the sleeve 17 is mounted coaxially to the axis 8 and between the head part 9 and the plate 25 is seated to move the plate 25 in contact with the flange 18 and normally hold and the roller 23 in contact with a cam 27 to move and normally hold, which is formed on an outer surface of an intermediate portion of a drive shaft 28 which is mounted through the bore 5 therethrough to rotate with respect to the housing 4 about the axis 6.
  • the head part 9 receives in its interior a suction valve 29 for sucking the fuel into the cylinder 14 and a pressure valve 30 for pushing the fuel to the engine (not shown).
  • the valve 29 is mounted in a suction duct 31 having a longitudinal axis 32 perpendicular to the axis 8, and comprises a cylindrical valve body 33 extending around the axis 32 and axially along the duct 31 through a closure cover 34 inserted in the Line 31 is screwed, is held.
  • the valve 29 further includes a closure member 35 which is mounted through the valve body 33 to move between an open position and a closed position of the valve 29.
  • the closure member 35 is by a spring 36 which is between the valve body 33 and an annular, on
  • Closing part 35 mounted transversely to the axis 32 mounted plate 37, moved to its closed position and normally held there.
  • the valve 30 controls the supply of fuel along a pressure line defined by the head portion 9 through the portions 12 and 13b, and includes a cup-shaped closure member 38 slidably disposed in the portion 13b and between an open position and a second position
  • Closed position of the valve 30 is movable.
  • the closure member 38 is moved by a spring 39, which sits between the closure member 38 and a mounted in the section 13b stop sleeve 40 in its closed position and normally held there.
  • the sections 12, 13b are interconnected by a shoulder substantially parallel to one another
  • frusto-conical coupling portion 41 which is designed so that it is fluid-tight with a substantially spherical
  • Coupling portion 42 of the closure part 38 couples.
  • the portion 12 is further provided with a sawtooth toothing 43 which is formed on an inner wall 44 of the portion 12 and includes a plurality of annular teeth 45 which project inwardly from the wall 44.
  • FIG. 4 differs from the illustration in Figure 3 only in that the sawtooth-shaped toothing 43 has been removed and replaced by an annular tooth 46 which projects inwardly from the wall 44 and a substantially quadrangular, in particular square or rectangular, cross-section.
  • the toothing 43 and the tooth 46 are executed on the inner wall of a sleeve which is inserted into the section 12.
  • the piston 15 During operation, the piston 15 generates pressure waves in the cylinder 14 during its compression stroke.
  • the teeth 43 and the tooth 46 make it possible to break the front of the pressure waves, prevent the pressure bubbles, the coupling portions 41, 42 , or allow the vapor bubbles to reach the coupling portions 41, 42 with a relatively low energy, prevent wear by cavitation of the coupling portions 41, 42 and thereby guarantee proper fluid-tight coupling of the closure member 38 to the head portion 9.

Landscapes

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

Abstract

The invention relates to a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, comprising at least one cylinder (14), a piston (15) which is displaceably arranged in the cylinder (14), and a pressure valve (30) for selectively controlling the supply of fuel to the internal combustion engine, wherein the pressure valve (30) has a closure part (38) which is displaceably arranged in a widened portion (13b) of a pressure line (12, 13b), said pressure line being further provided with a narrowed portion (12) having a toothing (43, 46) which is formed on the inner wall (44) thereof.

Description

Beschreibung  description
Titel title
PUMPENAGGREGAT ZUM ZU FÜHREN VON KRAFTSTOFF, BEVORZUGT DI ESEL, ZU EIN EM VERBRENNUNGSMOTOR  PUMP UNIT TO LEAD FUEL, DIESEL FAVORES, TO AN EM COMBUSTION ENGINE
Die vorliegende Erfindung bezieht sich auf ein Pumpenaggregat zum Zuführen von Kraftstoff, bevorzugt Diesel, zu einem Verbrennungsmotor. The present invention relates to a pump set for supplying fuel, preferably diesel, to an internal combustion engine.
Im Besonderen bezieht sich die vorliegende Erfindung auf ein Pumpenaggregat des Typs, der einen Pumpenkörper, mindestens einen im Pumpenkörper ausgebildeten Zylinder, einen im Zylinder verschieblich angeordneten Kolben und eine Betätigungsvorrichtung, um den Kolben bei einem Ansaughub zum More particularly, the present invention relates to a pump assembly of the type comprising a pump body, at least one cylinder formed in the pump body, a piston displaceably disposed in the cylinder, and an actuator for urging the piston in an intake stroke
Ansaugen des Kraftstoffs in den Zylinder und bei einem Verdichtungshub zum Verdichten des im Zylinder enthaltenen Kraftstoffs zu bewegen, umfasst. Suction of the fuel into the cylinder and during a compression stroke for compressing the fuel contained in the cylinder to move comprises.
Das Pumpenaggregat umfasst ferner eine Saugleitung zum Ansaugen des Kraftstoffs in den Zylinder, ein Saugventil, das entlang der Saugleitung angebracht ist, um das Zuführen des Kraftstoffs in den Zylinder selektiv zu steuern, eine Druckleitung zum Drücken des Kraftstoffs zum Verbrennungsmotor und ein Druckventil, das entlang der Druckleitung angebracht ist, um das The pump assembly further includes a suction line for aspirating the fuel into the cylinder, a suction valve mounted along the suction line to selectively control the supply of the fuel to the cylinder, a pressure line for pushing the fuel to the internal combustion engine, and a pressure valve along the pressure line is attached to the
Zuführen des Kraftstoffs zum Verbrennungsmotor selektiv zu steuern.  Supplying the fuel to the internal combustion engine to selectively control.
Die Druckleitung verläuft koaxial zu einer Längsachse des Zylinders, und in ihr ist verschieblich ein Verschlussteil des Druckventils angeordnet. The pressure line is coaxial with a longitudinal axis of the cylinder, and in it is slidably disposed a closure part of the pressure valve.
Das Verschlussteil des Druckventils ist somit axial dem Kolben zugewandt und ist zwischen einer Öffnungsstellung und einer Schließstellung der Druckleitung beweglich. Das Verschlussteil weist einen im Wesentlichen kugelförmigen Kupplungsabschnitt auf, der so gestaltet ist, dass er sich fluiddicht mit einem im Wesentlichen kegelstumpfförmigen Kupplungsabschnitt der Druckleitung kuppelt, wenn sich das Verschlussteil in seiner Schließstellung befindet. The closure part of the pressure valve is thus axially facing the piston and is movable between an open position and a closed position of the pressure line. The closure member has a substantially spherical coupling portion that is configured to fluidly couple with a substantially frusto-conical coupling portion of the pressure line when the closure member is in its closed position.
Die bekannten Pumpenaggregate des oben genannten Typs weisen einige Nachteile auf, die hauptsächlich darauf beruhen, dass der Kolben während seines Verdichtungshubs im Innern des Zylinders Druckwellen erzeugt, die zwischen dem Verschlussteil des Druckventils und dem Kolben parallel zur Längsachse des Zylinders mindestens während der Anfangsphase des The known pump units of the above-mentioned type have some disadvantages, mainly due to the fact that during its compression stroke inside the cylinder, the piston generates pressure waves between the closure part of the pressure valve and the piston parallel to the longitudinal axis of the cylinder at least during the initial phase of the cylinder
Verdichtungshubs des Kolbens, d. h. wenn das Druckventil noch geschlossen ist, abprallen. Compression strokes of the piston, d. H. if the pressure valve is still closed, bounce off.
Die Hin- und Herbewegung der Druckwellen zwischen dem Verschlussteil und dem Kolben bewirkt die Entstehung von Dampfblasen und deren Implosion an den Kupplungsabschnitten des Verschlussteils und der Druckleitung. The reciprocation of the pressure waves between the closure member and the piston causes the formation of vapor bubbles and their implosion at the coupling portions of the closure member and the pressure line.
Das Implodieren der Dampfblasen führt durch Kavitation zum Verschleiß des Verschlussteils und der Druckleitung an den jeweiligen Kupplungsabschnitten und beeinträchtigt dadurch die einwandfreie fluiddichte Kupplung des The implosion of the vapor bubbles leads by cavitation to wear of the closure part and the pressure line at the respective coupling sections and thereby impairs the proper fluid-tight coupling of the
Verschlussteils mit der Druckleitung. Closure parts with the pressure line.
Aufgabe dieser Erfindung ist es, ein Pumpenaggregat zum Zuführen von Object of this invention is to provide a pump unit for supplying
Kraftstoff, bevorzugt Diesel, zu einem Verbrennungsmotor auszuführen, das die oben beschriebenen Nachteile nicht aufweist und einfach und günstig in der Ausführung ist. Fuel, preferably diesel, to perform an internal combustion engine, which does not have the disadvantages described above and is simple and inexpensive in the execution.
Gemäß der vorliegenden Erfindung wird ein Pumpenaggregat zum Zuführen von Kraftstoff, bevorzugt Diesel, zu einem Verbrennungsmotor nach den beigefügten Ansprüchen ausgeführt. According to the present invention, a pump set for supplying fuel, preferably diesel, to an internal combustion engine according to the appended claims.
Diese Erfindung wird nun unter Bezugnahme auf die beigefügten Zeichnungen beschrieben, die eine nicht einschränkende Ausführungsform darstellen. In diesen zeigen: Figur 1 eine erste schematische Schnittansicht, mit zur Verdeutlichung weggelassenen Teilen, einer bevorzugten Ausführungsform des This invention will now be described with reference to the accompanying drawings, which represent a non-limiting embodiment. In these show: Figure 1 is a first schematic sectional view, with omitted for clarity parts, a preferred embodiment of
erfindungsgemäßen Pumpenaggregats; pump unit according to the invention;
Figur 2 eine zweite schematische Schnittansicht, mit zur Verdeutlichung weggelassenen Teilen, des Pumpenaggregats aus Figur 1; Figure 2 is a second schematic sectional view, with parts omitted for clarity, of the pump unit of Figure 1;
Figur 3 eine schematische Schnittansicht eines Details des Pumpenaggregats aus den Figuren 1 und 2; Figure 3 is a schematic sectional view of a detail of the pump unit of Figures 1 and 2;
Figur 4 eine schematische Schnittansicht einer ersten Variante des Details aus Figur 3 und Figure 4 is a schematic sectional view of a first variant of the detail of Figure 3 and
Figur 5 eine schematische Schnittansicht einer zweiten Variante des Details aus Figur 3. FIG. 5 shows a schematic sectional view of a second variant of the detail from FIG. 3.
Unter Bezugnahme auf die Figuren 1 und 2 wird mit 1 ein Pumpenaggregat zum Zuführen von Kraftstoff, bevorzugt Diesel, zu einem Verbrennungsmotor (nicht dargestellt) im Ganzen bezeichnet. With reference to Figures 1 and 2, 1 denotes a pump unit for supplying fuel, preferably diesel, to an internal combustion engine (not shown) as a whole.
Das Pumpenaggregat 1 umfasst eine Kolbenpumpe 2 zum Zuführen des Kraftstoffs zu dem genannten Verbrennungsmotor (nicht dargestellt) und eine Vorförderpumpe 3, beispielsweise eine Zahnradpumpe, zum Zuführen des Kraftstoffs zu der Pumpe 2. The pump unit 1 comprises a piston pump 2 for supplying the fuel to said internal combustion engine (not shown) and a prefeed pump 3, for example a gear pump, for supplying the fuel to the pump 2.
Das Pumpenaggregat 1 weist einen Pumpenkörper auf, der ein Gehäuse 4 umfasst, das mit einer zentralen Bohrung 5 versehen ist, die eine Längsachse 6 besitzt, und mit mindestens einer seitlichen Bohrung 7 (normalerweise einer Vielzahl von Bohrungen 7, die gleichmäßig um die Achse 6 verteilt sind), die eine Längsachse 8 besitzt, die quer zur Achse 6 verläuft und sich ausgehend von der Bohrung 5 radial nach außerhalb des Gehäuses 4 erstreckt. Jede Bohrung 7 wird von einem Kopfteil 9 verschlossen, das in Kontakt mit dem Gehäuse 4 angeordnet ist und eine Verlängerung 10 aufweist, die koaxial zur Achse 8 in die Bohrung 7 hineinragt. The pump unit 1 comprises a pump body comprising a housing 4 provided with a central bore 5 having a longitudinal axis 6 and at least one lateral bore 7 (normally a plurality of bores 7 extending uniformly about the axis 6) are distributed), which has a longitudinal axis 8 which is transverse to the axis 6 and extending radially from the bore 5 to the outside of the housing 4. Each bore 7 is closed by a head part 9 which is arranged in contact with the housing 4 and has an extension 10 which projects coaxially with the axis 8 into the bore 7.
Das Kopfteil 9 weist eine zentrale Bohrung 11 auf, die durch das Kopfteil 9 hindurch koaxial zur Achse 8 ausgebildet ist, und umfasst einen eingeengten Zwischenabschnitt 12, der zwischen zwei aufgeweiteten Abschnitten 13a, 13b angeordnet ist, wobei der Abschnitt 13a der Bohrung 5 zugewandt ist und einen Zylinder 14 der Kolbenpumpe 2 definiert. The head portion 9 has a central bore 11 formed through the head portion 9 coaxial with the axis 8 and includes a constricted intermediate portion 12 disposed between two flared portions 13a, 13b, the portion 13a facing the bore 5 and a cylinder 14 of the piston pump 2 defined.
Im Zylinder 14 ist verschieblich ein Kolben 15 angeordnet, der unter dem Schub einer Betätigungsvorrichtung 16 mit einer geradlinigen Hin- und Herbewegung beweglich ist, die einen Saughub zum Ansaugen des Kraftstoffs in den Zylinder 14 und einen Verdichtungshub zum Verdichten des im Zylinder 14 enthaltenen Kraftstoffs umfasst. In the cylinder 14, a piston 15 is slidably movable under the thrust of an actuator 16 with a rectilinear reciprocating motion comprising a suction stroke for sucking the fuel into the cylinder 14 and a compression stroke for compressing the fuel contained in the cylinder 14 ,
Die Vorrichtung 16 umfasst eine rohrförmige Hülse 17, die verschieblich in der Bohrung 7 koaxial zur Achse 8 angeordnet ist, sich um den Zylinder 14 herum erstreckt und einen ringförmigen Innenflansch 18 aufweist, der radial aus einer Innenfläche der Hülse 17 herausragt und diese Hülse 17 in zwei zylindrische Abschnitte 19, 20 teilt, wobei der Abschnitt 19 der Bohrung 5 zugewandt ist. The device 16 comprises a tubular sleeve 17 which is slidably disposed in the bore 7 coaxial with the axis 8, extends around the cylinder 14 and has an annular inner flange 18 which protrudes radially from an inner surface of the sleeve 17 and this sleeve 17 in two cylindrical sections 19, 20 divides, wherein the portion 19 of the bore 5 faces.
Die Vorrichtung 16 weist ferner einen Stößel 21 auf, der einen im Wesentlichen zylindrischen Kupplungsblock 22 umfasst, der durch Übermaß im Abschnitt 19 festgehalten ist, im Kontakt mit dem Flansch 18 angeordnet ist und eine The device 16 further comprises a plunger 21 comprising a substantially cylindrical coupling block 22 which is held by excess in the portion 19, is arranged in contact with the flange 18 and a
Stößelrolle 23 trägt. Plunger roller 23 carries.
Die Rolle 23 ragt vom Block 22 aus zur Bohrung 5 vor und ist drehbar mit dem Block 22 gekuppelt, um in Bezug auf diesen Block 22 um eine eigene The roller 23 protrudes from the block 22 to the bore 5 and is rotatably coupled to the block 22 to be in relation to this block 22 by its own
Längsachse 24 zu drehen, die im Wesentlichen senkrecht zur Achse 8 verläuft. To rotate longitudinal axis 24 which is substantially perpendicular to the axis 8.
Der Flansch 18 trägt einen ringförmigen Teller 25, der sich um den Kolben 15 herum erstreckt, in den Abschnitt 20 der Hülse 17 koaxial zur Achse 8 eingesetzt ist und einen äußeren Umfangsrand, der axial dem Flansch 18 zugewandt ist, und einen inneren Umfangsrand, der axial einem Boden des Kolbens 15 zugewandt ist, aufweist. The flange 18 carries an annular plate 25 which extends around the piston 15, is inserted into the portion 20 of the sleeve 17 coaxial with the axis 8 and an outer peripheral edge which faces axially the flange 18, and an inner peripheral edge axially facing a bottom of the piston 15.
Die Vorrichtung 16 umfasst ferner eine Druckfeder 26, die zwischen der The device 16 further comprises a compression spring 26, which between the
Verlängerung 10 und der Hülse 17 koaxial zur Achse 8 angebracht ist und zwischen dem Kopfteil 9 und dem Teller 25 sitzt, um den Teller 25 in Kontakt mit dem Flansch 18 zu bewegen und normalerweise zu halten und die Rolle 23 in Kontakt mit einem Nocken 27 zu bewegen und normalerweise zu halten, der an einer Außenfläche eines Zwischenabschnitts einer Antriebswelle 28 ausgebildet ist, die durch die Bohrung 5 hindurch angebracht ist, um in Bezug auf das Gehäuse 4 um die Achse 6 zu drehen. Extension 10 and the sleeve 17 is mounted coaxially to the axis 8 and between the head part 9 and the plate 25 is seated to move the plate 25 in contact with the flange 18 and normally hold and the roller 23 in contact with a cam 27 to move and normally hold, which is formed on an outer surface of an intermediate portion of a drive shaft 28 which is mounted through the bore 5 therethrough to rotate with respect to the housing 4 about the axis 6.
Das Kopfteil 9 nimmt in seinem Innern ein Saugventil 29 zum Saugen des Kraftstoffs in den Zylinder 14 und ein Druckventil 30 zum Drücken des Kraftstoffs zum Verbrennungsmotor (nicht dargestellt) auf. The head part 9 receives in its interior a suction valve 29 for sucking the fuel into the cylinder 14 and a pressure valve 30 for pushing the fuel to the engine (not shown).
Das Ventil 29 ist in einer Saugleitung 31 angebracht, die eine senkrecht zur Achse 8 verlaufende Längsachse 32 aufweist, und umfasst einen zylindrischen Ventilkörper 33, der sich um die Achse 32 herum erstreckt und axial entlang der Leitung 31 durch einen Verschlussdeckel 34, der in die Leitung 31 geschraubt ist, festgehalten wird. The valve 29 is mounted in a suction duct 31 having a longitudinal axis 32 perpendicular to the axis 8, and comprises a cylindrical valve body 33 extending around the axis 32 and axially along the duct 31 through a closure cover 34 inserted in the Line 31 is screwed, is held.
Das Ventil 29 umfasst ferner ein Verschlussteil 35, das durch den Ventilkörper 33 hindurch angebracht ist, um sich zwischen einer Öffnungsstellung und einer Schließstellung des Ventils 29 zu bewegen. Das Verschlussteil 35 wird von einer Feder 36, die zwischen dem Ventilkörper 33 und einem ringförmigen, am The valve 29 further includes a closure member 35 which is mounted through the valve body 33 to move between an open position and a closed position of the valve 29. The closure member 35 is by a spring 36 which is between the valve body 33 and an annular, on
Verschlussteil 35 quer zur Achse 32 angebrachten Teller 37 sitzt, in seine Schließstellung bewegt und normalerweise dort gehalten. Closing part 35 mounted transversely to the axis 32 mounted plate 37, moved to its closed position and normally held there.
Das Ventil 30 steuert die Zuführung des Kraftstoffs entlang einer Druckleitung, die durch das Kopfteil 9 hindurch durch die Abschnitte 12 und 13b definiert wird, und umfasst ein becherförmiges Verschlussteil 38, das verschieblich im Abschnitt 13b angeordnet ist und zwischen einer Öffnungsstellung und einer The valve 30 controls the supply of fuel along a pressure line defined by the head portion 9 through the portions 12 and 13b, and includes a cup-shaped closure member 38 slidably disposed in the portion 13b and between an open position and a second position
Schließstellung des Ventils 30 beweglich ist. Das Verschlussteil 38 wird von einer Feder 39, die zwischen dem Verschlussteil 38 und einer im Abschnitt 13b angebrachten Anschlaghülse 40 sitzt, in seine Schließstellung bewegt und normalerweise dort gehalten. Closed position of the valve 30 is movable. The closure member 38 is moved by a spring 39, which sits between the closure member 38 and a mounted in the section 13b stop sleeve 40 in its closed position and normally held there.
Gemäß der Darstellung in Figur 3 sind die Abschnitte 12, 13b untereinander durch eine Schulter verbunden, die mit einem im Wesentlichen As shown in FIG. 3, the sections 12, 13b are interconnected by a shoulder substantially parallel to one another
kegelstumpfförmigen Kupplungsabschnitt 41 versehen ist, der so gestaltet ist, dass er sich fluiddicht mit einem im Wesentlichen kugelförmigen frusto-conical coupling portion 41 which is designed so that it is fluid-tight with a substantially spherical
Kupplungsabschnitt 42 des Verschlussteils 38 kuppelt. Coupling portion 42 of the closure part 38 couples.
Der Abschnitt 12 ist ferner mit einer sägezahnförmigen Zahnung 43 versehen, die an einer Innenwand 44 des Abschnitts 12 ausgebildet ist und eine Vielzahl von ringförmigen Zähnen 45 umfasst, die von der Wand 44 aus nach innen ragen. The portion 12 is further provided with a sawtooth toothing 43 which is formed on an inner wall 44 of the portion 12 and includes a plurality of annular teeth 45 which project inwardly from the wall 44.
Die in Figur 4 dargestellte Variante unterscheidet sich von der Darstellung in Figur 3 nur dadurch, dass in ihr die sägezahnförmige Zahnung 43 entfernt und durch einen ringförmigen Zahn 46 ersetzt wurde, der von der Wand 44 aus nach innen ragt und einen im Wesentlichen viereckigen, insbesondere quadratischen oder rechteckigen, Querschnitt aufweist. The variant shown in Figure 4 differs from the illustration in Figure 3 only in that the sawtooth-shaped toothing 43 has been removed and replaced by an annular tooth 46 which projects inwardly from the wall 44 and a substantially quadrangular, in particular square or rectangular, cross-section.
Gemäß einer nicht dargestellten Variante werden die Zahnung 43 und der Zahn 46 an der Innenwand einer Hülse ausgeführt, die in den Abschnitt 12 eingesetzt ist. According to a variant, not shown, the toothing 43 and the tooth 46 are executed on the inner wall of a sleeve which is inserted into the section 12.
Im Betrieb erzeugt der Kolben 15 während seines Verdichtungshubs Druckwellen im Zylinder 14. During operation, the piston 15 generates pressure waves in the cylinder 14 during its compression stroke.
Mindestens während der Anfangsphase des Verdichtungshubs des Kolbens 15, d. h. wenn das Druckventil 30 noch geschlossen ist, prallen die Druckwellen zwischen dem Kolben 15 und dem Verschlussteil 38 mit einer Hin- und At least during the initial phase of the compression stroke of the piston 15, d. H. when the pressure valve 30 is still closed, bounce the pressure waves between the piston 15 and the closure member 38 with a back and forth
Herbewegung ab, die die Entstehung von Dampfblasen bewirkt. Herbewegung, which causes the formation of vapor bubbles.
Die Zahnung 43 und der Zahn 46 ermöglichen es, die Front der Druckwellen zu brechen, verhindern, dass die Druckblasen die Kupplungsabschnitte 41, 42 erreichen, oder ermöglichen es, dass die Dampfblasen die Kupplungsabschnitte 41, 42 mit einer relativ geringen Energie erreichen, verhindern den Verschleiß durch Kavitation der Kupplungsabschnitte 41, 42 und garantieren dadurch die einwandfreie fluiddichte Kupplung des Verschlussteils 38 mit dem Kopfteil 9. The teeth 43 and the tooth 46 make it possible to break the front of the pressure waves, prevent the pressure bubbles, the coupling portions 41, 42 , or allow the vapor bubbles to reach the coupling portions 41, 42 with a relatively low energy, prevent wear by cavitation of the coupling portions 41, 42 and thereby guarantee proper fluid-tight coupling of the closure member 38 to the head portion 9.

Claims

Ansprüche claims
1. Pumpenaggregat zum Zuführen von Kraftstoff, bevorzugt Diesel, zu einem Verbrennungsmotor, umfassend einen Pumpenkörper (4, 9), mindestens einen im Pumpenkörper (4, 9) ausgebildeten Zylinder (14), einen im Zylinder (14) verschieblich angeordneten Kolben (15), eine Betätigungsvorrichtung (16) zum Bewegen des Kolbens (15) bei einem Ansaughub zum Ansaugen des Kraftstoffs in den Zylinder (14) und bei einem Verdichtungshub zum Verdichten des im Zylinder (14) A pump unit for supplying fuel, preferably diesel, to an internal combustion engine, comprising a pump body (4, 9), at least one cylinder (14) formed in the pump body (4, 9), a piston (15) displaceably arranged in the cylinder (14) ), an actuating device (16) for moving the piston (15) during an intake stroke for sucking the fuel into the cylinder (14) and during a compression stroke for compressing the in-cylinder (14)
enthaltenen Kraftstoffs, eine Druckleitung (12, 13b), die im  contained fuel, a pressure line (12, 13b) in the
Pumpenkörper (4, 9) ausgebildet ist, mit dem Verbrennungsmotor verbunden ist und ihrerseits einen verengten Abschnitt (12) und einen aufgeweiteten Abschnitt (13b) umfasst, und ein Druckventil (30) zum selektiven Steuern der Zuführung des Kraftstoffs zum  Pump body (4, 9) is formed, is connected to the internal combustion engine and in turn a constricted portion (12) and a flared portion (13 b) comprises, and a pressure valve (30) for selectively controlling the supply of fuel to
Verbrennungsmotor, wobei das Druckventil (30) ein Verschlussteil (38) umfasst, das verschieblich in dem aufgeweiteten Abschnitt (13b) angeordnet ist und zwischen einer Öffnungsstellung und einer  An internal combustion engine, wherein the pressure valve (30) comprises a closure member (38) which is slidably disposed in the flared portion (13b) and between an open position and a
Schließstellung der Druckleitung (12, 13b) beweglich ist, dadurch gekennzeichnet, dass der verengte Abschnitt (12) eine Zahnung (43, 46) aufweist, die von einer Innenwand (44) des verengten Abschnitts (12) aus nach innen ragt.  Closed position of the pressure line (12, 13 b) is movable, characterized in that the narrowed portion (12) has a toothing (43, 46) which projects from an inner wall (44) of the constricted portion (12) inwardly.
Pumpenaggregat nach Anspruch 1, wobei die Zahnung (43, 46) eine sägezahnförmige Zahnung umfasst, die wiederum eine Vielzahl von ringförmigen Zähnen (45) umfasst, die an der Innenwand (44) ausgebildet sind. A pump assembly according to claim 1, wherein the toothing (43, 46) comprises a sawtooth toothing which in turn comprises a plurality of annular teeth (45) formed on the inner wall (44).
Pumpenaggregat nach Anspruch 1, wobei die Zahnung (43, 46) mindestens einen ringförmigen Zahn (46) umfasst, der an der A pump assembly according to claim 1, wherein the toothing (43, 46) comprises at least one annular tooth (46) attached to the
Innenwand (44) ausgebildet ist. Inner wall (44) is formed.
4. Pumpenaggregat nach Anspruch 3, wobei der Zahn (46) einen viereckigen, insbesondere quadratischen oder rechteckigen, Querschnitt aufweist. 4. Pump unit according to claim 3, wherein the tooth (46) has a quadrangular, in particular square or rectangular, cross-section.
5. Pumpenaggregat nach einem der vorhergehenden Ansprüche, wobei die verengten und aufgeweiteten Abschnitte (12, 13b) untereinander durch eine Schulter verbunden sind, die mit einem im Wesentlichen kegelstumpfförmigen Kupplungsabschnitt (41) versehen ist, der so gestaltet ist, dass er sich fluiddicht mit einem im Wesentlichen kugelförmigen Kupplungsabschnitt (42) des Verschlussteils (38) kuppelt. 5. Pump unit according to one of the preceding claims, wherein the constricted and widened portions (12, 13 b) are interconnected by a shoulder which is provided with a substantially frusto-conical coupling portion (41) which is designed so that it is fluid-tight with a substantially spherical coupling portion (42) of the closure part (38) couples.
PCT/EP2017/083029 2016-12-28 2017-12-15 Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine WO2018122007A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000131859A IT201600131859A1 (en) 2016-12-28 2016-12-28 PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
IT102016000131859 2016-12-28

Publications (1)

Publication Number Publication Date
WO2018122007A1 true WO2018122007A1 (en) 2018-07-05

Family

ID=58609912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/083029 WO2018122007A1 (en) 2016-12-28 2017-12-15 Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine

Country Status (2)

Country Link
IT (1) IT201600131859A1 (en)
WO (1) WO2018122007A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037465A1 (en) * 1990-10-31 1992-05-07 Daimler Benz Ag Fuel injection pump for IC engine - has constantly open throttle bore in valve piston
WO2010130502A1 (en) * 2009-05-13 2010-11-18 Robert Bosch Gmbh Valve unit for a high-pressure piston fuel pump and pump comprising this valve unit
FR2953568A1 (en) * 2009-12-09 2011-06-10 Bosch Gmbh Robert Piston pump for brake installation of vehicle, has inlet valve placed on piston and provided with blocking body that is held by spring element, where spring element forms unit with sealing element
DE102012200708A1 (en) * 2012-01-19 2013-07-25 Robert Bosch Gmbh High pressure pump for fuel injection system of internal combustion engine, has working chamber that is divided into partial volumes partially filled depending on stroke of pump piston
DE102015116677A1 (en) * 2014-11-12 2016-05-12 Denso Corporation high pressure pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037465A1 (en) * 1990-10-31 1992-05-07 Daimler Benz Ag Fuel injection pump for IC engine - has constantly open throttle bore in valve piston
WO2010130502A1 (en) * 2009-05-13 2010-11-18 Robert Bosch Gmbh Valve unit for a high-pressure piston fuel pump and pump comprising this valve unit
FR2953568A1 (en) * 2009-12-09 2011-06-10 Bosch Gmbh Robert Piston pump for brake installation of vehicle, has inlet valve placed on piston and provided with blocking body that is held by spring element, where spring element forms unit with sealing element
DE102012200708A1 (en) * 2012-01-19 2013-07-25 Robert Bosch Gmbh High pressure pump for fuel injection system of internal combustion engine, has working chamber that is divided into partial volumes partially filled depending on stroke of pump piston
DE102015116677A1 (en) * 2014-11-12 2016-05-12 Denso Corporation high pressure pump

Also Published As

Publication number Publication date
IT201600131859A1 (en) 2018-06-28

Similar Documents

Publication Publication Date Title
EP2795082B1 (en) Connecting rod for a reciprocating-piston engine
WO2009013041A1 (en) High-pressure pump for a fuel system of an internal combustion engine
DE102005022661A1 (en) Fluid pump e.g. fuel-high pressure pump, for use in fuel system of internal combustion engine, has volume control valve that includes valve mechanism arranged parallel to another valve mechanism in fluidic manner
EP2394049A1 (en) Fuel injection valve for internal combustion engines
DE102016115281A1 (en) pump
DE102016202945A1 (en) Electromagnetically actuated inlet valve and high-pressure pump with inlet valve
DE102008057089A1 (en) Pump unit for a high-pressure pump
DE112009001971T5 (en) Check valve with separate spherical spring guide
EP3152434B1 (en) High-pressure fuel pump comprising a discharge valve with a valve ball and a valve body
DE102016220364A1 (en) Electromagnetically actuated inlet valve and high-pressure pump with inlet valve
DE102007047903A1 (en) Fuel e.g. lubrication oil, injection pump for accumulator fuel injection system of diesel machine, has pump driven by shaft to draw fuel from tank, where pump is designed with passage, which connects cam chamber and suction side of pump
WO2016058805A1 (en) Electromagnetically operable inlet valve and high-pressure pump with an inlet valve
DE102009003185A1 (en) Fuel injection pump
DE102008013441B4 (en) metering
EP3563058B1 (en) Pump device for pumping fuel, preferably diesel, towards a combustion engine
WO2018122007A1 (en) Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine
DE102009047727A1 (en) Piston pump with a closing body on the inlet valve
DE112016005545T5 (en) Pressure relief valve device and high pressure pump using the same
DE102012210087A1 (en) High-pressure fuel pump for fuel injection system, has valve element that is brought in open position with large opening stroke by actuator actuation or non-actuation independent of pressure difference between inlet and pump working space
EP3387247B1 (en) Electromagnetically actuatable inlet valve and high-pressure pump having an inlet valve
EP0877163B1 (en) Fuel injection pump
DE102017202229A1 (en) OIL TANK PISTON OF A FUEL INJECTION PUMP
DE68906515T2 (en) FUEL INJECTION PUMP.
WO2020127933A1 (en) Pump unit for feeding fuel, preferably diesel, to an internal combustion engine
DE60215994T2 (en) Overpressure relief valve in a fuel system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17823087

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17823087

Country of ref document: EP

Kind code of ref document: A1