EP3054144B1 - Relief valve for a high-pressure pump, in particular plug-in pump, and high pressure pump with such a relief valve - Google Patents

Relief valve for a high-pressure pump, in particular plug-in pump, and high pressure pump with such a relief valve Download PDF

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Publication number
EP3054144B1
EP3054144B1 EP15200341.4A EP15200341A EP3054144B1 EP 3054144 B1 EP3054144 B1 EP 3054144B1 EP 15200341 A EP15200341 A EP 15200341A EP 3054144 B1 EP3054144 B1 EP 3054144B1
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EP
European Patent Office
Prior art keywords
valve
pump
valve housing
pressure pump
bore
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EP15200341.4A
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German (de)
French (fr)
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EP3054144A1 (en
Inventor
Jochen Aleker
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—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
    • 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
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/025—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by a single piston
    • F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves

Definitions

  • the invention relates to an overflow valve for a preferably designed as a plug-pump high-pressure pump in a fuel injection system of an internal combustion engine having the features of the preamble of claim 1. Furthermore, the invention relates to a high-pressure pump, in particular plug-in pump, with such a relief valve.
  • An overflow valve of the aforementioned type is used for the mechanical control of the filling pressure of the high-pressure pump.
  • the overflow valve is arranged in an inlet region of the high-pressure pump and opens when the pressure in the inlet region exceeds a predetermined pressure. With the opening of the overflow valve, an excess amount of fuel is then supplied from the inlet region to a return region.
  • the overflow valve can be integrated into a high-pressure pump or be part of an assembly that can be connected to the high-pressure pump.
  • a low-pressure unit for a fuel pump in particular a high-pressure pump of an air-compressing, self-igniting internal combustion engine, known which serves to supply the fuel pump with fuel and has an overflow valve to control an excess amount of fuel.
  • the overflow valve is integrated into a housing of the low-pressure unit, via which the low-pressure unit can be connected to the fuel pump.
  • the connection is made in such a way that the housing can be fastened in different angular positions on the fuel pump.
  • inlet and Return nozzles are formed by the housing of the low pressure unit, they can be aligned according to the respective angular positions in space.
  • WO 01/40656 A1 discloses an overflow valve, wherein a valve body of the overflow valve is arranged in a housing of a high-pressure pump.
  • the document DE 10 2013 200 050 A1 shows an overflow valve for a fuel pump, comprising a housing, wherein the housing is integrated in the fuel pump.
  • JP S50 8319 U discloses a valve for a fuel system with radially arranged spigot.
  • An overflow valve of the aforementioned type is unnecessary if the fuel injection system in addition to the high-pressure pump comprises a regulated electric fuel pump as Vor fundamentalpumpe. Because then the high pressure pump supplied amount of fuel and thus the filling pressure can be specified by the electric fuel pump.
  • the present invention is based on the object of specifying a type of modular system, which comprises as the smallest unit an overflow valve, which can be attached to a high-pressure pump in a simple manner.
  • the attachment of the overflow valve to the high-pressure pump is in particular no structural changes to the high-pressure pump itself requires to this - depending on the design of the fuel injection system - to use either with or without overflow. This increases the possible applications of the high-pressure pump.
  • the spill valve should be simple and inexpensive to produce.
  • the overflow valve is specified with the features of claim 1. Furthermore, a high pressure pump, in particular plug-in pump, proposed with such a spill valve. Advantageous developments of the invention can be found in the respective subclaims.
  • the overflow valve proposed for a high-pressure pump, in particular a plug-in pump, in a fuel injection system of an internal combustion engine comprises a valve piston which is received axially displaceably in a central bore of a valve housing for connection of an inlet with a return against the spring force of a valve spring.
  • the valve housing has at least two radial bores, which are arranged at an axial distance from each other and open into the central bore, wherein the first radial bore part of the inlet and the second radial bore part of the return line.
  • both the return and the inlet are aligned radially with respect to the central bore of the spill valve. Because this means that the central bore of the overflow valve can be used as an inlet for the high-pressure pump. This means that the inflow of fuel takes place via the overflow valve. This in turn has the consequence that a supply connection provided on the high-pressure pump, usually for connection to a supply line, can be dispensed with. The vacated space can instead be used for the attachment of the overflow valve. Since the inlet nozzle is a standardized component and therefore has defined dimensions, the valve housing of the overflow valve can be designed accordingly. This ensures that the overflow valve can be fitted to most high-pressure pumps. Because they have a matched to the standardized inlet nozzle receiving bore. This means that the same interface can be used optionally for mounting the inlet nozzle or the overflow valve.
  • the spill valve can be mounted comparatively close to the high pressure area of the high pressure pump. This has the advantage that pressure losses in the supply line and / or in an upstream fuel filter can be counteracted. Furthermore, such a fitted overflow valve has a damping effect in volume waves or pressure pulsations.
  • valve housing of the spill valve is at least partially surrounded by a connector body having at least two connecting pieces.
  • a first connection piece serves to connect a supply line and a second connection piece serves to connect a return line.
  • the connecting body can thus replace a standard inlet nozzle, which is preferably eliminated when mounting the overflow valve according to the invention to a high-pressure pump.
  • the connecting pieces can be brought into overlap with outer circumferential side in the valve housing formed annular grooves, in which open the radial bores.
  • the angular position of the connecting piece in relation to the valve housing of the overflow valve plays no role, so that the connecting pieces are arbitrarily aligned and the respective installation situation customizable.
  • the connecting body for fixing the angular position of the connecting piece is rotatable relative to the valve housing.
  • the rotatability of the connecting body relative to the valve housing can be realized in that the valve housing has a cylindrical portion which is enclosed by a sleeve-shaped portion of the connecting body, to which the connecting pieces are attached radially.
  • the connecting body can also be designed in several parts.
  • connection body is made of a plastic material.
  • thermoplastic materials are suitable.
  • the production takes place by means of an injection process, in particular using a Slide tool.
  • the connecting body can also be made of a metallic material, such as aluminum or an aluminum alloy.
  • a plastic connector body If a plastic connector body is used, it can be pressed onto the valve housing in such a way that the required seal is ensured at the same time via the press fit.
  • the interference fit also prevents undesired rotation of the connection body relative to the valve housing.
  • At least one annular groove for receiving a sealing ring is formed on the outer peripheral side in the valve housing.
  • the connecting body can then be pushed onto the valve housing in such a way that the sealing ring is compressed in the radial direction and rests under radial prestress on both the valve housing and the connecting body.
  • a kind of interference fit of the connector body is achieved on the valve housing, which prevents undesirable rotation of the connector body relative to the valve housing.
  • the annular groove for receiving the sealing ring in the axial direction between the two radial bores of the valve housing and / or the annular grooves is arranged, in which open the two radial bores.
  • the connection body at least two such sealing points between the two radial bores or annular grooves are provided.
  • a seal of the valve housing formed in the central bore to the outside is preferably achieved via a closure body, which is preferably pressed into the central bore. Further preferably, the valve spring is axially supported on the closure body, so that the average opening pressure of the overflow valve can be adjusted via the press-in depth of the closure body.
  • the valve housing of the overflow valve preferably has an external thread.
  • the external thread allows the screwing of the valve housing in a receiving bore of the high pressure pump, which usually serves to receive a standard inlet nozzle and this is equipped with an internal thread.
  • the screwed connection thus enables a particularly simple and cost-effective variation of the high-pressure pump in order to adapt it to the respective customer-specific circumstances. Because on the pump body, in particular on the barrel or cylinder head, which is usually made of a high-strength hardened steel, no costly and therefore expensive structural changes must be made. This applies in particular if the external thread provided for connecting the overflow valve to the high-pressure pump is arranged on a stub-shaped end of the valve housing.
  • the valve housing has at one end or a further end a geometry formed on the outer circumference side or on the inner circumference as an engagement or engagement surface for a tool.
  • the geometry should ensure an anti-rotation of the tool relative to the valve housing to facilitate screwing the valve housing into a receiving bore of the high-pressure pump.
  • this is therefore preferably designed as a hexagon socket or Torx.
  • the further proposed for a fuel injection system of an internal combustion engine high-pressure pump, in particular plug-in pump, is characterized in that it comprises an inventive overflow valve.
  • the valve housing of the overflow valve is screwed into a receiving bore of a pump body.
  • the receiving bore preferably extends radially with respect to a cylinder bore of the pump body, in which a pump piston for limiting a pump working space is received in a liftable manner.
  • This arrangement provides an arrangement near the high pressure area of the high pressure pump so that the spill valve is capable of reducing pressure losses and dampening pressure pulsations.
  • this arrangement corresponds to the arrangement of a standard inlet nozzle, so that either such or the overflow valve according to the invention can be inserted into the receiving bore.
  • the receiving bore provided in the pump body is connected via a connecting channel, which is preferably designed as an oblique bore, to a low-pressure region in which an inlet valve is arranged is.
  • a connecting channel which is preferably designed as an oblique bore
  • the inlet valve which serves to fill the pump working space with fuel, is preferably installed or installed axially with respect to the cylinder bore of the pump body of the high-pressure pump. This means that in the case of an outwardly opening inlet valve, it opens in the flow direction into the pump working chamber. This facilitates the filling of the pump working space with fuel.
  • the in the Fig. 1 shown high-pressure pump 2 is designed as a plug-in pump. It comprises a pump body 21 with a cylinder bore 22, in which a pump piston 23 is received to and fro movable.
  • the pump piston 23 defines a pump working space 24 formed in the cylinder bore 22.
  • an inlet valve 27 is provided, which is arranged in a low-pressure region 26 of the high-pressure pump 2 and opens into the pump working chamber 24.
  • fuel is supplied to the pump working chamber 24 via the inlet valve 27. This is then compressed in the delivery operation of the high-pressure pump and then fed via an outlet valve 28 to a high-pressure accumulator (not shown).
  • the high-pressure pump 2 can be connected to a supply line (not shown).
  • the connection is either via a standard inlet nozzle (not shown), which can be screwed into a receiving bore 20 of the high-pressure pump 2, or - as in the Fig. 1 represented - via a connecting piece 12, which is part of a connection body 11 of a spill valve 1, which is screwed into the receiving bore 20 of the valve housing 8 instead of a standard inlet nozzle.
  • the inlet takes place in this case via the overflow valve 1 and the receiving bore 20, wherein the receiving bore 20 is connected via a connecting channel 25 with the low-pressure region 26.
  • valve housing 8 which is end equipped with an external thread 18 for screwing into the receiving bore 20 of the high-pressure pump 2.
  • a corresponding internal thread is formed in the receiving bore 20, a corresponding internal thread is formed.
  • the valve housing 8 at the other end has a geometry 19 which is formed as a hexagon socket for receiving a corresponding tool (see Fig. 2 or Fig. 3 ).
  • connection body 11 which forms the inlet 4 serving as connecting piece 12.
  • connection piece 12 of the connecting body 11 forms a further connection piece 13, which serves as a return 5.
  • Der Anschlußstutzen 13 ist mit dem Stanford Research 12sky.
  • the connecting body 11 is rotatably arranged relative to the valve housing 8.
  • FIG. 2 serving as inlet 4 and return 5 connecting pieces 12, 13 are arranged at an axial distance from each other.
  • radial bores 9, 10, which are formed in the valve housing 8 and on the one hand in a central bore 7 and on the other hand in the outer peripheral side annular grooves 14, 15 open to produce a hydraulic connection of the radial bores 9, 10 with the connecting pieces 12, 13.
  • the inlet is therefore via the connection piece 12, the annular groove 14 and the radial bore 9, so that in the central bore 7 of the valve housing 8 of the overflow valve 1 inlet pressure prevails.
  • a valve piston 3 In the central bore 7 of the valve housing 8 of the overflow valve 1, a valve piston 3 is received axially displaceable, which is acted upon in the closing direction by the spring force of a valve spring 6. In the opening direction, inlet pressure is applied. If the inlet pressure exceeds a predetermined limit, the valve piston 3 is displaced against the spring force of the valve spring 6 in the direction of the radial bore 10 until a connection between inlet 4 and return 5 is established. In the open position of the overflow valve 1, an excess amount of fuel is supplied to the return, so that the inlet pressure drops below the predetermined limit again. The spring force of the valve spring 6 then returns the valve piston 3.
  • valve spring 6 is supported on the one hand directly on the valve piston 3 and on the other hand on a closure body 29, which is for this purpose pressed into the central bore 7.
  • closure body 29 also seals the central bore 7 to the outside.
  • a seal between the connecting body 11 and the valve housing 8 of the overflow valve 1 is effected by a sealing ring 17 which is inserted into an outer peripheral side annular groove 16 of the valve housing 8.
  • connection body 11 may have a pump body 21 facing, end-side annular groove 30 for receiving a sealing ring 17 (see Fig.2 or Fig. 3 ).
  • 8 further outer peripheral side annular grooves 16 may be formed for receiving sealing rings 17 in the valve housing.
  • At least one annular groove 16 for receiving a sealing ring 17 between the two radial bores 9, 10 and between the two annular grooves 14, 15 may be arranged.
  • the connecting body 11 is designed in several parts (not shown), for example, to align the two connecting pieces 12, 13 independently by turning relative to the valve housing 8, more sealing rings 17 are provided.
  • overflow valves 1 have in common that they can be attached to either a high-pressure pump 2, in particular a plug-in pump. If the installation situation requires no overflow valve 1, instead of the overflow valve 1, a standardized inlet connection piece can be screwed into the receiving bore 20 of the high-pressure pump 2. If an overflow valve 1 is required, the inlet connection piece can be removed and an overflow valve 1 according to the invention can be used, since this also comprises a connecting piece 12 serving as an inlet 4. In addition, no changes must be made to the high-pressure pump 2 itself.

Description

Die Erfindung betrifft ein Überströmventil für eine vorzugsweise als Steckpumpe ausgebildete Hochdruckpumpe in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung eine Hochdruckpumpe, insbesondere Steckpumpe, mit einem solchen Überströmventil.The invention relates to an overflow valve for a preferably designed as a plug-pump high-pressure pump in a fuel injection system of an internal combustion engine having the features of the preamble of claim 1. Furthermore, the invention relates to a high-pressure pump, in particular plug-in pump, with such a relief valve.

Stand der TechnikState of the art

Ein Überströmventil der vorstehend genannten Art dient der mechanischen Steuerung des Fülldrucks der Hochdruckpumpe. Das Überströmventil ist hierzu in einem Zulaufbereich der Hochdruckpumpe angeordnet und öffnet, wenn der Druck im Zulaufbereich einen vorgegeben Druck übersteigt. Mit dem Öffnen des Überströmventils wird dann eine überschüssige Menge Kraftstoff aus dem Zulaufbereich einem Rücklaufbereich zugeführt. Das Überströmventil kann in eine Hochdruckpumpe integriert oder Bestandteil einer mit der Hochdruckpumpe verbindbaren Baugruppe sein.An overflow valve of the aforementioned type is used for the mechanical control of the filling pressure of the high-pressure pump. For this purpose, the overflow valve is arranged in an inlet region of the high-pressure pump and opens when the pressure in the inlet region exceeds a predetermined pressure. With the opening of the overflow valve, an excess amount of fuel is then supplied from the inlet region to a return region. The overflow valve can be integrated into a high-pressure pump or be part of an assembly that can be connected to the high-pressure pump.

Aus der Offenlegungsschrift DE 10 2009 000 835 A1 ist beispielsweise eine Niederdruckeinheit für eine Brennstoffpumpe, insbesondere eine Hochdruckpumpe einer luftverdichtenden, selbstzündenden Brennkraftmaschine, bekannt, die der Versorgung der Brennstoffpumpe mit Kraftstoff dient und zur Absteuerung einer überschüssigen Kraftstoffmenge ein Überströmventil besitzt. Das Überströmventil ist dabei in ein Gehäuse der Niederdruckeinheit integriert, über welches die Niederdruckeinheit mit der Brennstoffpumpe verbindbar ist. Die Verbindung erfolgt in der Weise, dass das Gehäuse in verschiedenen Winkellagen an der Brennstoffpumpe befestigbar ist. Da Zulauf- und Rücklaufstutzen durch das Gehäuse der Niederdruckeinheit ausgebildet werden, können diese entsprechend den jeweiligen Winkellagen im Raum ausgerichtet werden.From the publication DE 10 2009 000 835 A1 For example, a low-pressure unit for a fuel pump, in particular a high-pressure pump of an air-compressing, self-igniting internal combustion engine, known which serves to supply the fuel pump with fuel and has an overflow valve to control an excess amount of fuel. The overflow valve is integrated into a housing of the low-pressure unit, via which the low-pressure unit can be connected to the fuel pump. The connection is made in such a way that the housing can be fastened in different angular positions on the fuel pump. As inlet and Return nozzles are formed by the housing of the low pressure unit, they can be aligned according to the respective angular positions in space.

Aus dem Dokument DE 10 2012 200 894 A1 ist eine Kraftstoffhochdruckpumpe mit einem Pumpengehäuse und einem Überströmventil bekannt, wobei das Überströmventil in einer Ausnehmung des Pumpengehäuses eingesetzt ist.From the document DE 10 2012 200 894 A1 is a high-pressure fuel pump with a pump housing and a spill valve known, the spill valve is inserted in a recess of the pump housing.

Das Dokument WO 01/40656 A1 offenbart ein Überströmventil, wobei ein Ventilkörper des Überströmventils in einem Gehäuse einer Hochdruckpumpe angeordnet ist.The document WO 01/40656 A1 discloses an overflow valve, wherein a valve body of the overflow valve is arranged in a housing of a high-pressure pump.

Aus dem Dokument DE 198 10 867 A1 ist ein Überströmventil bekannt, das in ein Hochdruckpumpengehäuse angeordnet ist.From the document DE 198 10 867 A1 An overflow valve is known, which is arranged in a high-pressure pump housing.

Das Dokument DE 10 2013 200 050 A1 zeigt ein Überströmventil für eine Kraftstoffpumpe, aufweisend ein Gehäuse, wobei das Gehäuse in der Kraftstoffpumpe integriert ist.The document DE 10 2013 200 050 A1 shows an overflow valve for a fuel pump, comprising a housing, wherein the housing is integrated in the fuel pump.

Das DokumentThe document JPJP S50 8319S50 8319 UU offenbart ein Ventil für ein Kraftstoffsystem mit radial angeordneten Anschlussstutzen.discloses a valve for a fuel system with radially arranged spigot.

Ein Überströmventil der vorstehend genannten Art ist entbehrlich, wenn das Kraftstoffeinspritzsystem neben der Hochdruckpumpe eine geregelte Elektrokraftstoffpumpe als Vorförderpumpe umfasst. Denn dann kann die der Hochdruckpumpe zugeführte Kraftstoffmenge und damit der Fülldruck durch die Elektrokraftstoffpumpe vorgegeben werden.An overflow valve of the aforementioned type is unnecessary if the fuel injection system in addition to the high-pressure pump comprises a regulated electric fuel pump as Vorförderpumpe. Because then the high pressure pump supplied amount of fuel and thus the filling pressure can be specified by the electric fuel pump.

Der vorliegenden Erfindung liegt nunmehr die Aufgabe zugrunde, eine Art Baukastensystem anzugeben, das als kleinste Einheit ein Überströmventil umfasst, das in einfacher Weise an eine Hochdruckpumpe anbaubar ist. Der Anbau des Überströmventils an die Hochdruckpumpe soll insbesondere keine baulichen Veränderungen an der Hochdruckpumpe selbst erfordert, um diese - je nach Auslegung des Kraftstoffeinspritzsystems - wahlweise mit oder ohne Überströmventil einsetzen zu können. Dadurch erhöhen sich die Einsatzmöglichkeiten der Hochdruckpumpe. Ferner soll das Überströmventil einfach und kostengünstig herstellbar sein.The present invention is based on the object of specifying a type of modular system, which comprises as the smallest unit an overflow valve, which can be attached to a high-pressure pump in a simple manner. The attachment of the overflow valve to the high-pressure pump is in particular no structural changes to the high-pressure pump itself requires to this - depending on the design of the fuel injection system - to use either with or without overflow. This increases the possible applications of the high-pressure pump. Furthermore, the spill valve should be simple and inexpensive to produce.

Zur Lösung der Aufgabe wird das Überströmventil mit den Merkmalen des Anspruchs 1 angegeben. Ferner wird eine Hochdruckpumpe, insbesondere Steckpumpe, mit einem solchen Überströmventil vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den jeweiligen Unteransprüchen zu entnehmen.To solve the problem, the overflow valve is specified with the features of claim 1. Furthermore, a high pressure pump, in particular plug-in pump, proposed with such a spill valve. Advantageous developments of the invention can be found in the respective subclaims.

Offenbarung der ErfindungDisclosure of the invention

Das für eine Hochdruckpumpe, insbesondere Steckpumpe, in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine, vorgeschlagene Überströmventil umfasst einen Ventilkolben, der zur Verbindung eines Zulaufs mit einem Rücklauf entgegen der Federkraft einer Ventilfeder axial verschiebbar in einer zentralen Bohrung eines Ventilgehäuses aufgenommen ist. Ferner weist das Ventilgehäuse mindestens zwei Radialbohrungen auf, die in einem axialen Abstand zueinander angeordnet sind und in die zentrale Bohrung münden, wobei die erste Radialbohrung Teil des Zulaufs und die zweite Radialbohrung Teil des Rücklaufs ist.The overflow valve proposed for a high-pressure pump, in particular a plug-in pump, in a fuel injection system of an internal combustion engine comprises a valve piston which is received axially displaceably in a central bore of a valve housing for connection of an inlet with a return against the spring force of a valve spring. Further, the valve housing has at least two radial bores, which are arranged at an axial distance from each other and open into the central bore, wherein the first radial bore part of the inlet and the second radial bore part of the return line.

Wesentlich ist, dass sowohl der Rücklauf als auch der Zulauf radial in Bezug auf die zentrale Bohrung des Überströmventils ausgerichtet sind. Denn dies bedeutet, dass die zentrale Bohrung des Überströmventils als Zulauf für die Hochdruckpumpe nutzbar ist. Das heißt, dass der Zulauf von Kraftstoff über das Überströmventil erfolgt. Dies wiederum hat zur Folge, dass ein an der Hochdruckpumpe üblicherweise zur Verbindung mit einer Zulaufleitung vorgesehener Zulaufstutzen entfallen kann. Der freiwerdende Platz kann stattdessen für den Anbau des Überströmventils genutzt werden. Da der Zulaufstutzen ein standardisiertes Bauteil ist und demzufolge definierte Abmessungen besitzt, kann das Ventilgehäuse des Überströmventils entsprechend ausgebildet werden. Dadurch ist gewährleistet, dass das Überströmventil an die meisten Hochdruckpumpen anbaubar ist. Denn diese besitzen eine an den standardisierten Zulaufstutzen angepasste Aufnahmebohrung. Das heißt, dass die gleiche Schnittstelle wahlweise für den Anbau des Zulaufstutzens oder des Überströmventils genutzt werden kann.It is essential that both the return and the inlet are aligned radially with respect to the central bore of the spill valve. Because this means that the central bore of the overflow valve can be used as an inlet for the high-pressure pump. This means that the inflow of fuel takes place via the overflow valve. This in turn has the consequence that a supply connection provided on the high-pressure pump, usually for connection to a supply line, can be dispensed with. The vacated space can instead be used for the attachment of the overflow valve. Since the inlet nozzle is a standardized component and therefore has defined dimensions, the valve housing of the overflow valve can be designed accordingly. This ensures that the overflow valve can be fitted to most high-pressure pumps. Because they have a matched to the standardized inlet nozzle receiving bore. This means that the same interface can be used optionally for mounting the inlet nozzle or the overflow valve.

Wird die Schnittstelle genutzt, die üblicherweise für die Montage eines Standard-Zulaufstutzens vorgesehen ist, kann zudem das Überströmventil vergleichsweise nah am Hochdruckbereich der Hochdruckpumpe montiert werden. Dies besitzt den Vorteil, dass Druckverlusten in der Zulaufleitung und/oder in einem vorgeschalteten Kraftstofffilter entgegengewirkt werden kann. Ferner besitzt ein derart angebautes Überströmventil eine dämpfende Wirkung bei Mengenwellen bzw. Druckpulsationen.If the interface is used, which is usually provided for the installation of a standard inlet nozzle, also the spill valve can be mounted comparatively close to the high pressure area of the high pressure pump. This has the advantage that pressure losses in the supply line and / or in an upstream fuel filter can be counteracted. Furthermore, such a fitted overflow valve has a damping effect in volume waves or pressure pulsations.

Erfindungsgemäß ist das Ventilgehäuse des Überströmventils zumindest bereichsweise von einem Anschlusskörper umgeben, der mindestens zwei Anschlussstutzen besitzt. Ein erster Anschlussstutzen dient dem Anschluss einer Zulaufleitung und ein zweiter Anschlussstutzen dient dem Anschluss einer Rücklaufleitung. Der Anschlusskörper vermag somit einen Standard-Zulaufstutzen zu ersetzen, der bei Anbau des erfindungsgemäßen Überströmventils an eine Hochdruckpumpe vorzugsweise entfällt.According to the valve housing of the spill valve is at least partially surrounded by a connector body having at least two connecting pieces. A first connection piece serves to connect a supply line and a second connection piece serves to connect a return line. The connecting body can thus replace a standard inlet nozzle, which is preferably eliminated when mounting the overflow valve according to the invention to a high-pressure pump.

Ferner ist für die Erfindung wesentlich, dass die Anschlussstutzen in Überdeckung mit außenumfangseitig im Ventilgehäuse ausgebildeten Ringnuten bringbar sind, in welche die Radialbohrungen münden. In diesem Fall spielt die Winkellage der Anschlussstutzen in Bezug auf das Ventilgehäuse des Überströmventils keine Rolle, so dass die Anschlussstutzen beliebig ausrichtbar und der jeweiligen Einbausituation anpassbar sind.Furthermore, it is essential for the invention that the connecting pieces can be brought into overlap with outer circumferential side in the valve housing formed annular grooves, in which open the radial bores. In this case, the angular position of the connecting piece in relation to the valve housing of the overflow valve plays no role, so that the connecting pieces are arbitrarily aligned and the respective installation situation customizable.

In Weiterbildung der Erfindung wird vorgeschlagen wird vorgeschlagen, dass der Anschlusskörper zur Festlegung der Winkellage der Anschlussstutzen drehbar gegenüber dem Ventilgehäuse ist. Die Drehbarkeit des Anschlusskörpers gegenüber dem Ventilgehäuse kann dadurch realisiert werden, dass das Ventilgehäuse einen zylinderförmigen Abschnitt besitzt, der von einem hülsenförmigen Abschnitt des Anschlusskörpers umschlossen wird, an den die Anschlussstutzen radial angesetzt sind. Um die beiden Anschlussstutzen unabhängig voneinander gegenüber dem Ventilgehäuse des Überströmventils zu verdrehen, kann der Anschlusskörper auch mehrteilig ausgeführt sein.In a further development of the invention, it is proposed that the connecting body for fixing the angular position of the connecting piece is rotatable relative to the valve housing. The rotatability of the connecting body relative to the valve housing can be realized in that the valve housing has a cylindrical portion which is enclosed by a sleeve-shaped portion of the connecting body, to which the connecting pieces are attached radially. In order to rotate the two connecting pieces independently of one another relative to the valve housing of the overflow valve, the connecting body can also be designed in several parts.

Bevorzugt ist der Anschlusskörper aus einem Kunststoffmaterial gefertigt. Hierzu eigenen sich beispielsweise thermoplastische Kunststoffe. Ferner bevorzugt erfolgt die Herstellung mittels eines Spritzprozesses, insbesondere unter Verwendung eines Schieber-Werkzeugs. Sofern es höhere Anforderungen an die Festigkeit zu erfüllen gilt, kann der Anschlusskörper auch aus einem metallischen Werkstoff, wie beispielsweise Aluminium oder einer Aluminiumlegierung, gefertigt werden.Preferably, the connection body is made of a plastic material. For this purpose, for example, thermoplastic materials are suitable. Further preferably, the production takes place by means of an injection process, in particular using a Slide tool. If there are higher requirements for the strength to be met, the connecting body can also be made of a metallic material, such as aluminum or an aluminum alloy.

Gelangt ein Anschlusskörper aus Kunststoff zum Einsatz, kann dieser auf das Ventilgehäuse in der Weise aufgepresst werden, dass über den Presssitz zugleich die erforderliche Abdichtung gewährleistet ist. Der Presssitz verhindert zudem ein unerwünschtes Verdrehen des Anschlusskörpers gegenüber dem Ventilgehäuse.If a plastic connector body is used, it can be pressed onto the valve housing in such a way that the required seal is ensured at the same time via the press fit. The interference fit also prevents undesired rotation of the connection body relative to the valve housing.

Alternativ oder ergänzend, insbesondere bei Verwendung eines Anschlusskörpers aus einem metallischen Werkstoff, wird vorgeschlagen, dass außenumfangseitig im Ventilgehäuse mindestens eine Ringnut zur Aufnahme eines Dichtrings ausgebildet ist. Der Anschlusskörper kann dann derart auf das Ventilgehäuse geschoben werden, dass der Dichtring in radialer Richtung zusammengepresst wird und unter radialer Vorspannung sowohl am Ventilgehäuse als auch am Anschlusskörper anliegt. Zugleich wird eine Art Presssitz des Anschlusskörpers auf dem Ventilgehäuse erreicht, der ein unerwünschtes Verdrehen des Anschlusskörpers gegenüber dem Ventilgehäuse verhindert.Alternatively or additionally, in particular when using a connecting body made of a metallic material, it is proposed that at least one annular groove for receiving a sealing ring is formed on the outer peripheral side in the valve housing. The connecting body can then be pushed onto the valve housing in such a way that the sealing ring is compressed in the radial direction and rests under radial prestress on both the valve housing and the connecting body. At the same time a kind of interference fit of the connector body is achieved on the valve housing, which prevents undesirable rotation of the connector body relative to the valve housing.

Vorzugsweise ist die Ringnut zur Aufnahme des Dichtrings in axialer Richtung zwischen den beiden Radialbohrungen des Ventilgehäuses und/oder den Ringnuten angeordnet, in welche die beiden Radialbohrungen münden. Bei einer mehrteiligen Ausführung des Anschlusskörpers sind mindestens zwei derartige Dichtstellen zwischen den beiden Radialbohrungen bzw. Ringnuten vorzusehen.Preferably, the annular groove for receiving the sealing ring in the axial direction between the two radial bores of the valve housing and / or the annular grooves is arranged, in which open the two radial bores. In a multi-part design of the connection body at least two such sealing points between the two radial bores or annular grooves are provided.

Eine Abdichtung der im Ventilgehäuse ausgebildeten zentralen Bohrung nach außen wird bevorzugt über einen Verschlusskörper erreicht, der vorzugsweise in die zentrale Bohrung eingepresst ist. Weiterhin bevorzugt ist am Verschlusskörper die Ventilfeder axial abgestützt, so dass über die Einpresstiefe des Verschlusskörpers der mittlere Öffnungsdruck des Überströmventils einstellbar ist.A seal of the valve housing formed in the central bore to the outside is preferably achieved via a closure body, which is preferably pressed into the central bore. Further preferably, the valve spring is axially supported on the closure body, so that the average opening pressure of the overflow valve can be adjusted via the press-in depth of the closure body.

Zur Verbindung des Überströmventils mit der Hochdruckpumpe besitzt vorzugsweise das Ventilgehäuse des Überströmventils ein Außengewinde. Das Außengewinde ermöglicht das Einschrauben des Ventilgehäuses in eine Aufnahmebohrung der Hochdruckpumpe, die üblicherweise der Aufnahme eines Standard-Zulaufstutzens dient und hierzu mit einem Innengewinde ausgestattet ist. Die geschraubte Verbindung ermöglicht somit eine besonders einfache und kostengünstige Variation der Hochdruckpumpe, um sie an die jeweiligen kundenspezifischen Gegebenheiten anzupassen. Denn am Pumpenkörper, insbesondere am Barrel oder Zylinderkopf, der in der Regel aus einem hochfesten gehärteten Stahl gefertigt ist, müssen keine aufwendigen und damit teuren baulichen Änderungen vorgenommen werden. Dies gilt im Besonderen, wenn das zur Verbindung des Überströmventils mit der Hochdruckpumpe vorgesehene Außengewinde an einem stutzenförmigen Ende des Ventilgehäuses angeordnet ist.To connect the overflow valve with the high-pressure pump, the valve housing of the overflow valve preferably has an external thread. The external thread allows the screwing of the valve housing in a receiving bore of the high pressure pump, which usually serves to receive a standard inlet nozzle and this is equipped with an internal thread. The screwed connection thus enables a particularly simple and cost-effective variation of the high-pressure pump in order to adapt it to the respective customer-specific circumstances. Because on the pump body, in particular on the barrel or cylinder head, which is usually made of a high-strength hardened steel, no costly and therefore expensive structural changes must be made. This applies in particular if the external thread provided for connecting the overflow valve to the high-pressure pump is arranged on a stub-shaped end of the valve housing.

Vorteilhafterweise besitzt das Ventilgehäuse an einem Ende bzw. einem weiteren Ende eine außenumfangseitig oder innenumfangseitig ausgebildete Geometrie als Angriffs- bzw. Eingriffsfläche für ein Werkzeug. Dabei sollte die Geometrie eine Verdrehsicherung des Werkzeugs gegenüber dem Ventilgehäuse gewährleisten, um das Einschrauben des Ventilgehäuses in eine Aufnahmebohrung der Hochdruckpumpe zu erleichtern. Im Falle einer innenumfangseitig ausgebildeten Geometrie ist diese daher bevorzugt als Innensechskant oder Torx ausgebildet.Advantageously, the valve housing has at one end or a further end a geometry formed on the outer circumference side or on the inner circumference as an engagement or engagement surface for a tool. The geometry should ensure an anti-rotation of the tool relative to the valve housing to facilitate screwing the valve housing into a receiving bore of the high-pressure pump. In the case of a geometry formed on the inner circumference, this is therefore preferably designed as a hexagon socket or Torx.

Die ferner für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine vorgeschlagene Hochdruckpumpe, insbesondere Steckpumpe, zeichnet sich dadurch aus, dass sie ein erfindungsgemäßes Überströmventil umfasst. Das Ventilgehäuse des Überströmventils ist dabei in eine Aufnahmebohrung eines Pumpenkörpers eingeschraubt. Die Aufnahmebohrung verläuft vorzugsweise radial in Bezug auf eine Zylinderbohrung des Pumpenkörpers, in der ein Pumpenkolben zur Begrenzung eines Pumpenarbeitsraums hubbeweglich aufgenommen ist. Diese Anordnung gewährleistet eine Anordnung nahe dem Hochdruckbereich der Hochdruckpumpe, so dass das Überströmventil in der Lage ist, Druckverluste zu mindern und Druckpulsationen zu dämpfen. Ferner entspricht diese Anordnung der Anordnung eines Standard-Zulaufstutzens, so dass wahlweise ein solcher oder das erfindungsgemäße Überströmventil in die Aufnahmebohrung einsetzbar ist.The further proposed for a fuel injection system of an internal combustion engine high-pressure pump, in particular plug-in pump, is characterized in that it comprises an inventive overflow valve. The valve housing of the overflow valve is screwed into a receiving bore of a pump body. The receiving bore preferably extends radially with respect to a cylinder bore of the pump body, in which a pump piston for limiting a pump working space is received in a liftable manner. This arrangement provides an arrangement near the high pressure area of the high pressure pump so that the spill valve is capable of reducing pressure losses and dampening pressure pulsations. Furthermore, this arrangement corresponds to the arrangement of a standard inlet nozzle, so that either such or the overflow valve according to the invention can be inserted into the receiving bore.

Des Weiteren wird vorgeschlagen, dass die im Pumpenkörper vorgesehene Aufnahmebohrung über einen Verbindungkanal, der vorzugsweise als Schrägbohrung ausgeführt ist, mit einem Niederdruckbereich verbunden ist, in dem ein Einlassventil angeordnet ist. Dies ermöglicht kurze Leitungswege. Ferner wird die Herstellung der Hochdruckpumpe vereinfacht, so dass die Herstellungskosten sinken.Furthermore, it is proposed that the receiving bore provided in the pump body is connected via a connecting channel, which is preferably designed as an oblique bore, to a low-pressure region in which an inlet valve is arranged is. This allows short cable routes. Furthermore, the production of the high-pressure pump is simplified, so that the manufacturing costs decrease.

Das Einlassventil, das der Befüllung des Pumpenarbeitsraums mit Kraftstoff dient, ist bevorzugt axial in Bezug auf die Zylinderbohrung des Pumpenkörpers der Hochdruckpumpe ein- oder angebaut. Das heißt, dass bei einem nach außen öffnenden Einlassventil dieses in Strömungsrichtung in den Pumpenarbeitsraum öffnet. Dadurch wird die Befüllung des Pumpenarbeitsraums mit Kraftstoff erleichtert.The inlet valve, which serves to fill the pump working space with fuel, is preferably installed or installed axially with respect to the cylinder bore of the pump body of the high-pressure pump. This means that in the case of an outwardly opening inlet valve, it opens in the flow direction into the pump working chamber. This facilitates the filling of the pump working space with fuel.

Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

  • Fig. 1 einen schematischen Längsschnitt durch eine erfindungsgemäße Hochdruckpumpe,
  • Fig. 2 einen schematischen Längsschnitt durch das Überströmventil der Hochdruckpumpe der Fig. 1 und
  • Fig. 3 einen schematischen Längsschnitt durch eine alternative Ausführungsform eines erfindungsgemäßen Überströmventils.
Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
  • Fig. 1 a schematic longitudinal section through a high-pressure pump according to the invention,
  • Fig. 2 a schematic longitudinal section through the overflow of the high pressure pump Fig. 1 and
  • Fig. 3 a schematic longitudinal section through an alternative embodiment of an overflow valve according to the invention.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Die in der Fig. 1 dargestellte Hochdruckpumpe 2 ist als Steckpumpe ausgeführt. Sie umfasst einen Pumpenkörper 21 mit einer Zylinderbohrung 22, in der ein Pumpenkolben 23 hin und her beweglich aufgenommen ist. Der Pumpenkolben 23 begrenzt einen Pumpenarbeitsraum 24, der in der Zylinderbohrung 22 ausgebildet ist. Zur Befüllung des Pumpenarbeitsraums 24 mit Kraftstoff ist ein Einlassventil 27 vorgesehen, das in einem Niederdruckbereich 26 der Hochdruckpumpe 2 angeordnet ist und in den Pumpenarbeitsraum 24 hinein öffnet. Im Saugbetrieb der Hochdruckpumpe 2 wird dem Pumpenarbeitsraum 24 über das Einlassventil 27 Kraftstoff zugeführt. Dieser wird dann im Förderbetrieb der Hochdruckpumpe verdichtet und anschließend über ein Auslassventil 28 einem Hochdruckspeicher (nicht dargestellt) zugeführt.The in the Fig. 1 shown high-pressure pump 2 is designed as a plug-in pump. It comprises a pump body 21 with a cylinder bore 22, in which a pump piston 23 is received to and fro movable. The pump piston 23 defines a pump working space 24 formed in the cylinder bore 22. For filling the pump working chamber 24 with fuel, an inlet valve 27 is provided, which is arranged in a low-pressure region 26 of the high-pressure pump 2 and opens into the pump working chamber 24. In the suction operation of the high-pressure pump 2, fuel is supplied to the pump working chamber 24 via the inlet valve 27. This is then compressed in the delivery operation of the high-pressure pump and then fed via an outlet valve 28 to a high-pressure accumulator (not shown).

Zur Versorgung des Niederdruckbereichs 26 und damit des Einlassventils 27 mit Kraftstoff ist die Hochdruckpumpe 2 an eine Zulaufleitung (nicht dargestellt) anschließbar. Der Anschluss erfolgt entweder über einen Standard-Zulaufstutzen (nicht dargestellt), der in eine Aufnahmebohrung 20 der Hochdruckpumpe 2 einschraubbar ist, oder - wie in der Fig. 1 dargestellt - über einen Anschlussstutzen 12, der Bestandteil eines Anschlusskörpers 11 eines Überströmventils 1 ist, das anstelle eines Standard-Zulaufstutzens in die Aufnahmebohrung 20 des Ventilgehäuses 8 eingeschraubt ist. Der Zulauf erfolgt in diesem Fall über das Überströmventil 1 und die Aufnahmebohrung 20, wobei die Aufnahmebohrung 20 über einen Verbindungskanal 25 mit dem Niederdruckbereich 26 verbunden ist.To supply the low-pressure region 26 and thus of the inlet valve 27 with fuel, the high-pressure pump 2 can be connected to a supply line (not shown). The connection is either via a standard inlet nozzle (not shown), which can be screwed into a receiving bore 20 of the high-pressure pump 2, or - as in the Fig. 1 represented - via a connecting piece 12, which is part of a connection body 11 of a spill valve 1, which is screwed into the receiving bore 20 of the valve housing 8 instead of a standard inlet nozzle. The inlet takes place in this case via the overflow valve 1 and the receiving bore 20, wherein the receiving bore 20 is connected via a connecting channel 25 with the low-pressure region 26.

Das zugleich als Zulauf dienende Überströmventil 1 besitzt ein Ventilgehäuse 8, das endseitig mit einem Außengewinde 18 zum Einschrauben in die Aufnahmebohrung 20 der Hochdruckpumpe 2 ausgestattet ist. In der Aufnahmebohrung 20 ist ein entsprechendes Innengewinde ausgebildet. Das Einschrauben wird ferner dadurch erleichtert, dass das Ventilgehäuse 8 andernends eine Geometrie 19 besitzt, die als Innensechskant zur Aufnahme eines entsprechenden Werkzeugs ausgebildet ist (siehe Fig. 2 oder Fig. 3).The serving at the same time as an overflow valve 1 has a valve housing 8, which is end equipped with an external thread 18 for screwing into the receiving bore 20 of the high-pressure pump 2. In the receiving bore 20, a corresponding internal thread is formed. The screwing is further facilitated by the fact that the valve housing 8 at the other end has a geometry 19 which is formed as a hexagon socket for receiving a corresponding tool (see Fig. 2 or Fig. 3 ).

An den das Außengewinde 18 aufweisenden Endabschnitt des Ventilgehäuses 8 schließt sich ein weiterer Abschnitt an, der außerhalb des Pumpenkörpers 21 zu liegen kommt und von dem Anschlusskörper 11 umgeben ist, der den als Zulauf 4 dienenden Anschlussstutzen 12 ausbildet. Neben diesem Anschlussstutzen 12 bildet der Anschlusskörper 11 einen weiteren Anschlussstutzen 13 aus, der als Rücklauf 5 dient. Um die Anschlussstutzen 12, 13 in einer beliebigen Winkellage auszurichten, ist der Anschlusskörper 11 drehbar gegenüber dem Ventilgehäuse 8 angeordnet.At the outer thread 18 having the end portion of the valve housing 8, a further section adjoins, which comes to rest outside the pump body 21 and is surrounded by the connection body 11, which forms the inlet 4 serving as connecting piece 12. In addition to this connection piece 12 of the connecting body 11 forms a further connection piece 13, which serves as a return 5. Der Anschlußstutzen 13 ist mit dem Anschlussstück 12 verbunden. In order to align the connecting pieces 12, 13 in any angular position, the connecting body 11 is rotatably arranged relative to the valve housing 8.

Wie der Fig. 2 zu entnehmen ist, sind die als Zulauf 4 und Rücklauf 5 dienenden Anschlussstutzen 12, 13 in einem axialen Abstand zueinander angeordnet. Gleiches gilt für Radialbohrungen 9, 10, die im Ventilgehäuse 8 ausgebildet sind und einerseits in eine zentrale Bohrung 7 sowie andererseits in außenumfangseitige Ringnuten 14, 15 münden, um eine hydraulische Verbindung der Radialbohrungen 9, 10 mit den Anschlussstutzen 12, 13 herzustellen. Der Zulauf erfolgt demnach über den Anschlussstutzen 12, die Ringnut 14 und die Radialbohrung 9, so dass in der zentralen Bohrung 7 des Ventilgehäuses 8 des Überströmventils 1 Zulaufdruck herrscht.Again Fig. 2 can be seen, serving as inlet 4 and return 5 connecting pieces 12, 13 are arranged at an axial distance from each other. The same applies to radial bores 9, 10, which are formed in the valve housing 8 and on the one hand in a central bore 7 and on the other hand in the outer peripheral side annular grooves 14, 15 open to produce a hydraulic connection of the radial bores 9, 10 with the connecting pieces 12, 13. The inlet is therefore via the connection piece 12, the annular groove 14 and the radial bore 9, so that in the central bore 7 of the valve housing 8 of the overflow valve 1 inlet pressure prevails.

In der zentralen Bohrung 7 des Ventilgehäuses 8 des Überströmventils 1 ist ein Ventilkolben 3 axial verschiebbar aufgenommen, der in Schließrichtung von der Federkraft einer Ventilfeder 6 beaufschlagt ist. In Öffnungsrichtung liegt Zulaufdruck an. Übersteigt der Zulaufdruck einen vorgegebenen Grenzwert, wird der Ventilkolben 3 entgegen der Federkraft der Ventilfeder 6 in Richtung der Radialbohrung 10 verschoben, bis eine Verbindung zwischen Zulauf 4 und Rücklauf 5 hergestellt ist. In Offenstellung des Überströmventils 1 wird eine überschüssige Menge Kraftstoff dem Rücklauf zugeführt, so dass der Zulaufdruck wieder unterhalb des vorgegebenen Grenzwertes sinkt. Die Federkraft der Ventilfeder 6 stellt dann den Ventilkolben 3 zurück.In the central bore 7 of the valve housing 8 of the overflow valve 1, a valve piston 3 is received axially displaceable, which is acted upon in the closing direction by the spring force of a valve spring 6. In the opening direction, inlet pressure is applied. If the inlet pressure exceeds a predetermined limit, the valve piston 3 is displaced against the spring force of the valve spring 6 in the direction of the radial bore 10 until a connection between inlet 4 and return 5 is established. In the open position of the overflow valve 1, an excess amount of fuel is supplied to the return, so that the inlet pressure drops below the predetermined limit again. The spring force of the valve spring 6 then returns the valve piston 3.

Die Ventilfeder 6 ist einerseits unmittelbar am Ventilkolben 3 und andererseits an einem Verschlusskörper 29 abgestützt, der hierzu in die zentrale Bohrung 7 eingepresst ist. Der Verschlusskörper 29 dichtet zudem die zentrale Bohrung 7 nach außen hin ab. Eine Abdichtung zwischen dem Anschlusskörper 11 und dem Ventilgehäuse 8 des Überströmventils 1 wird durch einen Dichtring 17 bewirkt, der in eine außenumfangseitige Ringnut 16 des Ventilgehäuses 8 eingelegt ist.The valve spring 6 is supported on the one hand directly on the valve piston 3 and on the other hand on a closure body 29, which is for this purpose pressed into the central bore 7. The closure body 29 also seals the central bore 7 to the outside. A seal between the connecting body 11 and the valve housing 8 of the overflow valve 1 is effected by a sealing ring 17 which is inserted into an outer peripheral side annular groove 16 of the valve housing 8.

Werden höhere Anforderungen an die Dichtigkeit gestellt, können weitere Dichtringe 17 vorgesehen werden. Beispielsweise kann der Anschlusskörper 11 eine dem Pumpenkörper 21 zugewandte, stirnseitige Ringnut 30 zur Aufnahme eines Dichtrings 17 besitzen (siehe Fig.2 oder Fig. 3). Ferner können im Ventilgehäuse 8 weitere außenumfangseitige Ringnuten 16 zur Aufnahme von Dichtringen 17 ausgebildet sein.If higher demands are placed on the tightness, further sealing rings 17 can be provided. For example, the connection body 11 may have a pump body 21 facing, end-side annular groove 30 for receiving a sealing ring 17 (see Fig.2 or Fig. 3 ). Further, 8 further outer peripheral side annular grooves 16 may be formed for receiving sealing rings 17 in the valve housing.

Um den Zulauf 4 gegenüber dem Rücklauf 5 abzudichten, kann - wie im Ausführungsbeispiel der Fig. 3 dargestellt - mindestens eine Ringnut 16 zur Aufnahme eines Dichtrings 17 zwischen den beiden Radialbohrungen 9, 10 bzw. zwischen den beiden Ringnuten 14, 15 angeordnet sein. Sofern der Anschlusskörper 11 mehrteilig ausgeführt ist (nicht dargestellt), um beispielsweise die beiden Anschlussstutzen 12, 13 unabhängig voneinander durch Verdrehen gegenüber dem Ventilgehäuse 8 ausrichten zu können, sind weitere Dichtringe 17 vorzusehen.In order to seal the inlet 4 with respect to the return 5, can - as in the embodiment of Fig. 3 shown - at least one annular groove 16 for receiving a sealing ring 17 between the two radial bores 9, 10 and between the two annular grooves 14, 15 may be arranged. If the connecting body 11 is designed in several parts (not shown), for example, to align the two connecting pieces 12, 13 independently by turning relative to the valve housing 8, more sealing rings 17 are provided.

Die in den Fig. 1 bis 3 dargestellten Überströmventile 1 haben jeweils gemein, dass sie wahlweise an eine Hochdruckpumpe 2, insbesondere eine Steckpumpe, anbaubar sind. Sofern die Einbausituation kein Überströmventil 1 erfordert, kann anstelle des Überströmventils 1 ein standardisierter Zulaufstutzen in die Aufnahmebohrung 20 der Hochdruckpumpe 2 eingeschraubt werden. Ist ein Überströmventil 1 erforderlich, kann der Zulaufstutzen entfernt und ein erfindungsgemäßes Überströmventil 1 eingesetzt werden, da dieses zugleich einen als Zulauf 4 dienenden Anschlussstutzen 12 umfasst. An der Hochdruckpumpe 2 selbst müssen darüber hinaus keine Änderungen vorgenommen werden.The in the Fig. 1 to 3 shown overflow valves 1 have in common that they can be attached to either a high-pressure pump 2, in particular a plug-in pump. If the installation situation requires no overflow valve 1, instead of the overflow valve 1, a standardized inlet connection piece can be screwed into the receiving bore 20 of the high-pressure pump 2. If an overflow valve 1 is required, the inlet connection piece can be removed and an overflow valve 1 according to the invention can be used, since this also comprises a connecting piece 12 serving as an inlet 4. In addition, no changes must be made to the high-pressure pump 2 itself.

Claims (8)

  1. Overflow valve (1) for a high-pressure pump (2), in particular plug-in pump, in a fuel injection system of an internal combustion engine, comprising a valve piston (3) which is received in a central bore (7) of a valve housing (8) so as to be axially displaceable counter to the spring force of a valve spring (6) for the connection of an inflow (4) to a return (5), wherein
    the valve housing (8) has at least two radial bores (9, 10), which are arranged with an axial spacing to one another and open into the central bore (7), wherein the first radial bore (9) is part of the inflow (4) and the second radial bore (10) is part of the return (5),
    characterized in that the valve housing (8) is surrounded at least regionally by a connection body (11) which has at least two connection pieces (12, 13) for the connection of an inflow line and a return line, wherein the connection pieces (12, 13) are able to be brought into overlap with annular grooves (14, 15) which are formed in the valve housing (8) on the outer circumferential side and into which the radial bores (9, 10) open.
  2. Overflow valve (1) according to Claim 1,
    characterized in that, for fixing the angular position of the connection pieces (12, 13), the connection body (11) is rotatable with respect to the valve housing (8).
  3. Overflow valve (1) according to either of the preceding claims,
    characterized in that, in the valve housing (8) on the outer circumferential side, at least one annular groove (16) is formed for receiving a sealing ring (17), wherein preferably, the annular groove (16) is arranged between the radial bores (9, 10) and/or the annular grooves (14, 15) in an axial direction.
  4. Overflow valve (1) according to one of the preceding claims,
    characterized in that the valve housing (8) has an outer thread (18) for connection to the high-pressure pump (2), wherein preferably, the outer thread (18) is arranged on a connection piece-like end of the valve housing (8).
  5. Overflow valve (1) according to one of the preceding claims,
    characterized in that, at one end, the valve housing (8) has, as a contact or engagement surface for a tool, a geometry (19) which is formed on the outer circumferential side or on the inner circumferential side, wherein preferably, the geometry (19) formed on the inner circumferential side is in the form of a hexagonal socket or Torx socket.
  6. High-pressure pump (2), in particular plug-in pump, for a fuel injection system of an internal combustion engine, having an overflow valve (1) according to one of the preceding claims, wherein the valve housing (8) of the overflow valve (1) is screwed into a receiving bore (20) of a pump body (21), which receiving bore preferably runs radially with respect to a cylinder bore (22) of the pump body (21), in which cylinder bore a pump piston (23) for delimiting a pump working chamber (24) is received such that it can perform stroke movements.
  7. High-pressure pump (2) according to Claim 6,
    characterized in that the receiving bore (20) is connected via a connection duct (25), which is preferably formed as an oblique bore, to a low-pressure region (26) in which an inlet valve (27) is arranged.
  8. High-pressure pump (2) according to Claim 6 or 7,
    characterized in that the inlet valve (27) is installed or mounted axially with respect to the cylinder bore (22) of the pump body (21).
EP15200341.4A 2015-02-03 2015-12-16 Relief valve for a high-pressure pump, in particular plug-in pump, and high pressure pump with such a relief valve Active EP3054144B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015201855.5A DE102015201855A1 (en) 2015-02-03 2015-02-03 Overflow valve for a high-pressure pump, in particular plug-in pump, and high-pressure pump with such a relief valve

Publications (2)

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EP3054144A1 EP3054144A1 (en) 2016-08-10
EP3054144B1 true EP3054144B1 (en) 2019-10-23

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ID=54936824

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Application Number Title Priority Date Filing Date
EP15200341.4A Active EP3054144B1 (en) 2015-02-03 2015-12-16 Relief valve for a high-pressure pump, in particular plug-in pump, and high pressure pump with such a relief valve

Country Status (2)

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EP (1) EP3054144B1 (en)
DE (1) DE102015201855A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018203697A1 (en) * 2018-03-12 2019-09-12 Robert Bosch Gmbh Fuel delivery device for cryogenic fuels
CN109185253B (en) * 2018-10-22 2020-04-21 杭州诚臻工程机械有限公司 Electromagnetic overflow valve

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS508319U (en) * 1973-05-10 1975-01-28
JPH0169179U (en) * 1987-10-28 1989-05-08
DE3820707A1 (en) * 1988-06-18 1989-12-21 Bosch Gmbh Robert INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
DE19810867C2 (en) * 1998-03-13 2000-02-24 Bosch Gmbh Robert Fuel pump arrangement
IT1310754B1 (en) * 1999-11-30 2002-02-22 Elasis Sistema Ricerca Fiat VALVE SYSTEM FOR INLET PRESSURE CONTROL OF A LIQUID IN A HIGH PRESSURE PUMP, AND RELATED VALVE
DE102009000835A1 (en) 2009-02-13 2010-08-19 Robert Bosch Gmbh Modular low pressure unit and modular pump arrangement
DE102012200894A1 (en) * 2012-01-23 2013-07-25 Robert Bosch Gmbh High-pressure fuel pump of an injection system
DE102013200050A1 (en) * 2013-01-03 2014-07-03 Robert Bosch Gmbh Overflow valve for e.g. high pressure pump of storage injection system, has vent holes that are formed in main portion for venting spring chamber, and are configured to connect spring chamber directly to channel in housing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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EP3054144A1 (en) 2016-08-10

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