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WO2018065235A1 - Throttle element, in particular for a high-pressure pump, in particular of a low-pressure circuit of a fuel injection system - Google Patents

Throttle element, in particular for a high-pressure pump, in particular of a low-pressure circuit of a fuel injection system Download PDF

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Publication number
WO2018065235A1
WO2018065235A1 PCT/EP2017/073991 EP2017073991W WO2018065235A1 WO 2018065235 A1 WO2018065235 A1 WO 2018065235A1 EP 2017073991 W EP2017073991 W EP 2017073991W WO 2018065235 A1 WO2018065235 A1 WO 2018065235A1
Authority
WO
WIPO (PCT)
Prior art keywords
bore
throttle
throttle element
injection system
pressure pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2017/073991
Other languages
German (de)
French (fr)
Inventor
Hannes Eisele
Patryk Sylwester
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to CN201780061768.1A priority Critical patent/CN109790807B/en
Priority to KR1020197012506A priority patent/KR20190057365A/en
Publication of WO2018065235A1 publication Critical patent/WO2018065235A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means
    • 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
    • F02M59/447—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 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
    • 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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/04—Check valves with guided rigid valve members shaped as balls
    • F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps

Definitions

  • Throttling element in particular for a high-pressure pump, in particular one
  • the invention relates to a throttle element, in particular for a low pressure circuit of a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a high pressure pump and a low pressure circuit with such a throttle element, in particular for forming a zero feed throttle.
  • Throttle elements are already known from the prior art, which can be used in a fuel passage of a low-pressure circuit of a fuel injection system and serve to form a zero-feed throttle. Such a throttle element is shown by way of example from DE 10 2009 001 564 AI.
  • the throttle element described in DE 10 2009 001 564 AI is used to discharge a leakage amount of a metering unit, which is connected upstream of a high-pressure fuel pump for flow control. If no quantity is to be pumped via the high-pressure pump in the zero-feed operation, the leakage quantity exiting via the metering unit must be removed.
  • This task is performed by the throttle element, which for this purpose has a body which can be inserted into a fuel channel in such a way that the fuel flow flowing in a main flow direction is throttled.
  • the body at least one throttle opening is provided, which is designed as a radial bore and connects an annular space surrounding the body with a longitudinal bore of the body. The throttle opening is accordingly flowed in from radially outside.
  • the throttle opening is preceded by a filter device designed as a gap filter. Since the throttle element depending on Pressure conditions not only in the main flow direction, but possibly also in the reverse direction, flows through, a further filter device is provided at the other end of the throttle element.
  • the present invention has the object, a throttle element in particular for a
  • This is preferably for a low-pressure circuit, in particular one
  • Fuel injection system in particular a common rail injection system, proposed throttle element comprises a preferably circular in cross-section body with a bore designed as an axial bore into which a designed as a radial bore throttle bore opens.
  • the bore is in particular formed as a central bore along the longitudinal axis of a substantially cylindrical body.
  • a check valve is integrated in the throttle element, which has at least one valve seat and one with the valve seat
  • the integrated check valve ensures that the throttle element is flowed through in only one direction when it is used as a zero delivery throttle in a low pressure circuit of a fuel injection system. In this way, a particle entry is reliably prevented by flowing back fuel.
  • the proposed functional integration reduces the number of required components. As a result, the manufacturing and assembly costs are reduced. Furthermore, the space requirement is reduced.
  • the throttle element a high reliability on when the check valve is designed as a double seat valve. Because then the loss amount can be reduced at high pressure pumping to a minimum. At the same time, the efficiency of the high pressure pump increases.
  • the closing element is in the direction of a first valve seat of the
  • Opening pressure of the check valve can be specified. Preferably, this opens
  • the first valve seat is formed by a shoulder of the body of the throttle element within the bore.
  • the bore is preferably designed as a stepped bore.
  • the bore may be at least partially conical, for example, to form a conical valve seat.
  • the cooperating with the at least one valve seat closing element is preferably spherical, so that the sealing seat is effected via a circular sealing line. In this way, a high sealing force can be achieved. At the same time, self-centering of the closing element with respect to the valve seat is ensured.
  • the closing element preferably cooperates with a further valve seat in order to minimize the loss quantity in the case of high-pressure delivery or to prevent the occurrence of a loss quantity.
  • the other valve seat is the first
  • the closing element can take a position between the two valve seats to remove a leakage amount. With changing pressure conditions, the closing element can come to rest on the first or on the second valve seat in order to prevent either a return flow of fuel into the inlet region or an outflow of fuel from the inlet region.
  • the further valve seat is formed by a sleeve which is inserted into the bore of the body of the throttle element, in particular pressed.
  • the sleeve for forming the further valve seat has a collar.
  • the annular collar can be used to support the spring, via whose spring force the closing element is biased in the direction of the first valve seat. If the sleeve is pressed into the bore of the body, the spring force of the spring can be adjusted via the press-in depth.
  • the throttle bore of the throttle element can not be avoided, it is proposed that the bore formed in the body, in which the
  • Throttle hole opens is executed as blind hole. That means that the
  • Body of the throttle element is closed or solid in at least one section. This section is upstream of the throttle bore, so that it can also be used to limit an annular gap, which is one of the
  • Throttle hole upstream gap filter is formed.
  • the throttle bore itself is preferably arranged in the region of an outer peripheral side constriction of the body.
  • the constriction leads to the formation of an upstream of the throttle bore annular space in which the discharged
  • Leakage amount can collect.
  • a low pressure circuit for a fuel injection system in particular for a common rail injection system, is proposed with such a throttle element for forming a zero feed throttle.
  • the throttle element is for this purpose in a
  • Fuel channel of the low pressure circuit used in particular pressed.
  • the press connection can be realized particularly simply and inexpensively, since no thread must be cut.
  • the fuel channel receiving the throttle element is in one
  • Housing part of a high-pressure pump is formed, in such a way that the fuel passage is connectable via the throttle element to a return of the low-pressure circuit. The discharged via the throttle element in the return
  • the body of the throttle element within the fuel channel defines an annular space which is connected via the throttle bore with the bore.
  • the throttle bore is in this case flowed through the annulus. If this is designed as an annular gap can be realized at the same time a filter function.
  • FIG. 1 is a schematic representation of a fuel injection system
  • Fig. 2 is a schematic longitudinal section through an inventive
  • the fuel injection system comprises a feed pump 100 which draws fuel 101 from a storage container 102 and conveys it through a main filter 103 filtered to a high-pressure pump 104.
  • the fuel 101 passes through a low pressure circuit 105 - which is also shown here only schematically - the high-pressure pump 104 and is subsequently fed to a metering unit 106.
  • the metering unit 106 meters the amount of fuel according to the required demand of the internal combustion engine and promotes the amount of fuel set via a supply line 107 to a high pressure circuit 108 of the high pressure pump 104.
  • the supplied fuel is then compressed in a well known manner and then to a - here only partially shown - pressure accumulator 109 passed, from which the fuel under high pressure 101 is removed for operation of the internal combustion engine.
  • the low pressure circuit 105 of the high pressure pump 104 is further connected via a return line 110 to the reservoir 102, so that this way through the leakage losses in the engine room of the high pressure pump 104 on the part of the
  • Excess fuel which is provided by the metering unit 106, but is not processed by the high-pressure pump 104, passes through a further return 111 via a throttling element 1 serving as a zero feed throttle back to the reservoir 102.
  • the throttle element 1 can be used as a separate
  • Component or be formed as part of the high-pressure pump 104.
  • the throttle element 1 shown in FIG. 2 comprises a cylindrical body 2.
  • the body 2 has a Pressübercroft against a fuel passage 14 of a housing part 15 of a high-pressure pump, in which the
  • Throttle element 1 is pressed directly according to this embodiment.
  • the press fit at the same time seals an inlet region of the fuel channel 14 lying upstream of the throttle element 1 from a return 16.
  • the body 2 has a constriction 13, through which an annular space 17 is formed within the fuel channel 14.
  • a throttle bore 4 designed as a radial bore is formed in the body 2, via which the annular space 17 is connected to a bore 3 of the body 2 designed as an axial bore.
  • annular space 17 is preceded by an annular gap 19, which forms a gap filter.
  • Check valve 5 integrated. This comprises a spherical closing element 8, which is accommodated in the bore 3 of the body 2 between two valve seats 6, 7 reciprocally movable. On the closing element 8, a spring 9 is supported, which biases the closing element against a first valve seat 6, which is formed by a shoulder 10 within the bore 3. The spring 9 holds that
  • Check valve 5 is closed when the pressure in the return 16 approximately to Pressure in the inlet area corresponds. In this way it is ensured that no fuel from the return 16 passes back into the inlet area.
  • the sleeve 11 has a

Landscapes

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

Abstract

The invention relates to a throttle element (1) for a low-pressure circuit of a fuel injection system, in particular of a common rail injection system, comprising a body (2) having a bore (3) configured as an axial bore, into which a throttle bore (4) designed as a radial bore opens. According to the invention, a non-return valve (5), which comprises at least one valve seat (6, 7) and a closure element (8) interacting with the valve seat (6, 7) is integrated in the throttle element (1). The invention further relates to a high-pressure pump and to a low-pressure circuit for a fuel injection system, in particular for a common rail injection system, having such a throttle element (1).

Description

Beschreibung Titel  Description title

Drosselelement, insbesondere für eine Hochdruckpumpe, insbesondere eines  Throttling element, in particular for a high-pressure pump, in particular one

Niederdruckkreis eines Kraftstoffeinspritzsystems Low pressure circuit of a fuel injection system

Die Erfindung betrifft ein Drosselelement, insbesondere für einen Niederdruckkreis eines Kraftstoffeinspritzsystems, insbesondere eines Common- Rail- Einspritzsystems, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung eine Hochdruckpumpe und einen Niederdruckkreis mit einem solchen Drosselelement, insbesondere zur Ausbildung einer Nullförderdrossel. The invention relates to a throttle element, in particular for a low pressure circuit of a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a high pressure pump and a low pressure circuit with such a throttle element, in particular for forming a zero feed throttle.

Stand der Technik State of the art

Aus dem Stand der Technik sind bereits Drosselelemente bekannt, die in einen Kraftstoffkanal eines Niederdruckkreislaufs eines Kraftstoffeinspritzsystems einsetzbar sind und der Ausbildung einer Nullförderdrossel dienen. Ein solches Drosselelement geht beispielhaft aus der DE 10 2009 001 564 AI hervor. Throttle elements are already known from the prior art, which can be used in a fuel passage of a low-pressure circuit of a fuel injection system and serve to form a zero-feed throttle. Such a throttle element is shown by way of example from DE 10 2009 001 564 AI.

Das in der DE 10 2009 001 564 AI beschriebene Drosselelement dient der Abführung einer Leckagemenge einer Zumesseinheit, die einer Kraftstoff-Hochdruckpumpe zur Mengenregelung vorgeschaltet ist. Soll im Nullförderbetrieb keine Menge über die Hochdruckpumpe gefördert werden, muss die über die Zumesseinheit austretende Leckagemenge abgeführt werden. Diese Aufgabe übernimmt das Drosselelement, das hierzu einen Körper besitzt, der in der Weise in einen Kraftstoffkanal einsetzbar ist, dass der in einer Hauptströmungsrichtung durchströmende Kraftstofffluss gedrosselt wird. Im Körper ist zumindest eine Drosselöffnung vorgesehen, die als Radialbohrung ausgeführt ist und einen den Körper umgebenden Ringraum mit einer Längsbohrung des Körpers verbindet. Die Drosselöffnung wird demnach von radial außen angeströmt. Um den Eintrag von Partikeln zu verhindern, ist der Drosselöffnung eine als Spaltfilter ausgeführte Filtereinrichtung vorgelagert. Da das Drosselelement je nach Druckverhältnissen nicht nur in Hauptströmungsrichtung, sondern ggf. auch in umgekehrter Richtung, durchflössen wird, ist eine weitere Filtereinrichtung am anderen Ende des Drosselelements vorgesehen. The throttle element described in DE 10 2009 001 564 AI is used to discharge a leakage amount of a metering unit, which is connected upstream of a high-pressure fuel pump for flow control. If no quantity is to be pumped via the high-pressure pump in the zero-feed operation, the leakage quantity exiting via the metering unit must be removed. This task is performed by the throttle element, which for this purpose has a body which can be inserted into a fuel channel in such a way that the fuel flow flowing in a main flow direction is throttled. In the body, at least one throttle opening is provided, which is designed as a radial bore and connects an annular space surrounding the body with a longitudinal bore of the body. The throttle opening is accordingly flowed in from radially outside. In order to prevent the entry of particles, the throttle opening is preceded by a filter device designed as a gap filter. Since the throttle element depending on Pressure conditions not only in the main flow direction, but possibly also in the reverse direction, flows through, a further filter device is provided at the other end of the throttle element.

Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Drosselelement insbesondere für einen Based on the above-mentioned prior art, the present invention has the object, a throttle element in particular for a

Niederdruckkreis eines Kraftstoffeinspritzsystems anzugeben, das eine hohe Low pressure circuit of a fuel injection system indicate that a high

Funktionssicherheit besitzt und zudem einfach und kostengünstig herstellbar ist. Functional reliability and also easy and inexpensive to produce.

Die Aufgabe wird gelöst durch das Drosselelement mit den Merkmalen des The object is achieved by the throttle element with the features of

Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Ferner werden eine Hochdruckpumpe und ein Niederdruckkreis mit einem solchen Drosselelement vorgeschlagen. Claim 1. Advantageous developments of the invention are specified in the dependent claims. Furthermore, a high pressure pump and a low pressure circuit are proposed with such a throttle element.

Offenbarung der Erfindung Disclosure of the invention

Das vorzugsweise für einen Niederdruckkreis, insbesondere eines This is preferably for a low-pressure circuit, in particular one

Kraftstoffeinspritzsystems, insbesondere eines Common- Rail- Einspritzsystems, vorgeschlagene Drosselelement umfasst einen vorzugsweise im Querschnitt kreisförmigen Körper mit einer als Axialbohrung ausgeführten Bohrung, in welche eine als Radialbohrung ausgebildete Drosselbohrung mündet. Die Bohrung ist insbesondere als eine zentrale Bohrung entlang der Längsachse eines im Wesentlichen zylindrischen Körpers ausgebildet. Erfindungsgemäß ist in das Drosselelement ein Rückschlagventil integriert, das mindestens einen Ventilsitz und ein mit dem Ventilsitz Fuel injection system, in particular a common rail injection system, proposed throttle element comprises a preferably circular in cross-section body with a bore designed as an axial bore into which a designed as a radial bore throttle bore opens. The bore is in particular formed as a central bore along the longitudinal axis of a substantially cylindrical body. According to the invention, a check valve is integrated in the throttle element, which has at least one valve seat and one with the valve seat

zusammenwirkendes Schließelement umfasst. Das integrierte Rückschlagventil stellt sicher, dass das Drosselelement in nur einer Richtung durchflössen wird, wenn es als Nullförderdrossel in einen Niederdruckkreis eines Kraftstoffeinspritzsystems eingesetzt wird. Auf diese Weise wird ein Partikeleintrag durch rückströmenden Kraftstoff sicher verhindert. Eine zusätzliche Filtereinrichtung und/oder ein zusätzliches comprises cooperating closing element. The integrated check valve ensures that the throttle element is flowed through in only one direction when it is used as a zero delivery throttle in a low pressure circuit of a fuel injection system. In this way, a particle entry is reliably prevented by flowing back fuel. An additional filter device and / or an additional

Rückschlagventil in einer Rücklaufleitung des Niederdruckkreises ist bzw. sind somit entbehrlich. Check valve in a return line of the low pressure circuit is or are therefore unnecessary.

Durch die vorgeschlagene Funktionsintegration reduziert sich die Anzahl der erforderlichen Bauteile. In der Folge sinken die Herstellungs- und Montagekosten. Ferner verringert sich der Bauraumbedarf. Darüber hinaus weist das Drosselelement eine hohe Funktionssicherheit auf, wenn das Rückschlagventil als Doppelsitzventil ausgebildet ist. Denn dann kann die Verlustmenge bei Hochdruckförderung auf ein Minimum reduziert werden. Zugleich steigt die Effizienz der Hochdruckpumpe. Bevorzugt ist das Schließelement in Richtung eines ersten Ventilsitzes von derThe proposed functional integration reduces the number of required components. As a result, the manufacturing and assembly costs are reduced. Furthermore, the space requirement is reduced. In addition, the throttle element a high reliability on when the check valve is designed as a double seat valve. Because then the loss amount can be reduced at high pressure pumping to a minimum. At the same time, the efficiency of the high pressure pump increases. Preferably, the closing element is in the direction of a first valve seat of the

Federkraft einer Feder beaufschlagt. Über die Federkraft der Feder ist der Spring force of a spring applied. About the spring force of the spring is the

Öffnungsdruck des Rückschlagventils vorgebbar. Vorzugsweise öffnet das Opening pressure of the check valve can be specified. Preferably, this opens

Rückschlagventil entgegen der Federkraft der Feder, wenn der Druck im Zulaufbereich der Hochdruckpumpe über einen vorgegebenen Grenzwert steigt. Check valve against the spring force of the spring when the pressure in the inlet region of the high-pressure pump rises above a predetermined limit.

Vorteilhafterweise wird der erste Ventilsitz durch einen Absatz des Körpers des Drosselelements innerhalb der Bohrung ausgebildet. Die Bohrung ist hierzu bevorzugt als Stufenbohrung ausgeführt. Alternativ oder ergänzend kann die Bohrung zumindest abschnittsweise konisch verlaufend ausgebildet sein, um beispielsweise einen kegelförmigen Ventilsitz auszubilden. Advantageously, the first valve seat is formed by a shoulder of the body of the throttle element within the bore. For this purpose, the bore is preferably designed as a stepped bore. Alternatively or additionally, the bore may be at least partially conical, for example, to form a conical valve seat.

Das mit dem mindestens einen Ventilsitz zusammenwirkende Schließelement ist vorzugsweise kugelförmig ausgebildet, so dass der Dichtsitz über eine kreisförmige Dichtlinie bewirkt wird. Auf diese Weise kann eine hohe Dichtkraft erzielt werden. Zugleich ist eine Selbstzentrierung des Schließelements in Bezug auf den Ventilsitz sichergestellt. The cooperating with the at least one valve seat closing element is preferably spherical, so that the sealing seat is effected via a circular sealing line. In this way, a high sealing force can be achieved. At the same time, self-centering of the closing element with respect to the valve seat is ensured.

Des Weiteren bevorzugt wirkt das Schließelement mit einem weiteren Ventilsitz zusammen, um die Verlustmenge bei Hochdruckförderung zu minimieren bzw. das Entstehen einer Verlustmenge zu verhindern. Der weitere Ventilsitz liegt dem erstenFurthermore, the closing element preferably cooperates with a further valve seat in order to minimize the loss quantity in the case of high-pressure delivery or to prevent the occurrence of a loss quantity. The other valve seat is the first

Ventilsitz gegenüber, so dass das Schließelement zur Abführung einer Leckagemenge eine Lage zwischen den beiden Ventilsitzen einnehmen kann. Bei wechselnden Druckverhältnissen kann das Schließelement zur Anlage am ersten oder am zweiten Ventilsitz gelangen, um entweder ein Rückströmen von Kraftstoff in den Zulaufbereich oder ein Abströmen von Kraftstoff aus dem Zulaufbereich zu verhindern. Opposite valve seat, so that the closing element can take a position between the two valve seats to remove a leakage amount. With changing pressure conditions, the closing element can come to rest on the first or on the second valve seat in order to prevent either a return flow of fuel into the inlet region or an outflow of fuel from the inlet region.

Gemäß einer bevorzugten Ausführungsform der Erfindung wird der weitere Ventilsitz durch eine Hülse gebildet, die in die Bohrung des Körpers des Drosselelements eingesetzt, insbesondere eingepresst ist. Auf diese Weise lässt sich der weitere Ventilsitz einfach und kostengünstig realisieren. Darüber hinaus wird vorgeschlagen, dass die Hülse zur Ausbildung des weiteren Ventilsitzes einen Ringbund aufweist. Der Ringbund kann zur Abstützung der Feder genutzt werden, über deren Federkraft das Schließelement in Richtung des ersten Ventilsitzes vorgespannt ist. Ist die Hülse in die Bohrung des Körpers eingepresst, kann über die Einpresstiefe die Federkraft der Feder eingestellt werden. According to a preferred embodiment of the invention, the further valve seat is formed by a sleeve which is inserted into the bore of the body of the throttle element, in particular pressed. In this way, the other valve seat can be realized easily and inexpensively. In addition, it is proposed that the sleeve for forming the further valve seat has a collar. The annular collar can be used to support the spring, via whose spring force the closing element is biased in the direction of the first valve seat. If the sleeve is pressed into the bore of the body, the spring force of the spring can be adjusted via the press-in depth.

Damit die Drosselbohrung des Drosselelements nicht umgangen werden kann, wird vorgeschlagen, dass die im Körper ausgebildete Bohrung, in welche die Thus, the throttle bore of the throttle element can not be avoided, it is proposed that the bore formed in the body, in which the

Drosselbohrung mündet, als Sacklochbohrung ausgeführt ist. Das heißt, dass derThrottle hole opens, is executed as blind hole. That means that the

Körper des Drosselelements in zumindest einem Abschnitt geschlossen bzw. massiv ausgeführt ist. Dieser Abschnitt ist der Drosselbohrung vorgelagert, so dass er zugleich zur Begrenzung eines Ringspalts eingesetzt werden kann, der eine der Body of the throttle element is closed or solid in at least one section. This section is upstream of the throttle bore, so that it can also be used to limit an annular gap, which is one of the

Drosselbohrung vorgelagerten Spaltfilter ausbildet. Throttle hole upstream gap filter is formed.

Die Drosselbohrung selbst ist vorzugsweise im Bereich einer außenumfangseitigen Einschnürung des Körpers angeordnet. Die Einschnürung führt zur Ausbildung eines der Drosselbohrung vorgelagerten Ringraums, in dem sich die abzuführende The throttle bore itself is preferably arranged in the region of an outer peripheral side constriction of the body. The constriction leads to the formation of an upstream of the throttle bore annular space in which the discharged

Leckagemenge sammeln kann. Leakage amount can collect.

Da die Vorteile des erfindungsgemäßen Drosselelements insbesondere bei Einsatz in einem Niederdruckkreis eines Kraftstoffeinspritzsystems zum Tragen kommen, wird ferner ein Niederdruckkreis für ein Kraftstoffeinspritzsystem, insbesondere für ein Common- Rail-Einspritzsystem, mit einem solchen Drosselelement zur Ausbildung einer Nullförderdrossel vorgeschlagen. Das Drosselelement ist hierzu in einen Since the advantages of the throttle element according to the invention come into play, in particular when used in a low pressure circuit of a fuel injection system, a low pressure circuit for a fuel injection system, in particular for a common rail injection system, is proposed with such a throttle element for forming a zero feed throttle. The throttle element is for this purpose in a

Kraftstoffkanal des Niederdruckkreises eingesetzt, insbesondere eingepresst. Die Pressverbindung lässt sich besonders einfach und kostengünstig realisieren, da kein Gewinde geschnitten werden muss. Bevorzugt ist der das Drosselelement aufnehmende Kraftstoffkanal in einem  Fuel channel of the low pressure circuit used, in particular pressed. The press connection can be realized particularly simply and inexpensively, since no thread must be cut. Preferably, the fuel channel receiving the throttle element is in one

Gehäuseteil einer Hochdruckpumpe ausgebildet, und zwar in der Weise, dass der Kraftstoffkanal über das Drosselelement an einen Rücklauf des Niederdruckkreises anschließbar ist. Die über das Drosselelement in den Rücklauf abgeführte  Housing part of a high-pressure pump is formed, in such a way that the fuel passage is connectable via the throttle element to a return of the low-pressure circuit. The discharged via the throttle element in the return

Leckagemenge bleibt somit dem System erhalten, wodurch die Effizienz des Systems weiter steigt. Des Weiteren wird vorgeschlagen, dass der Körper des Drosselelements innerhalb des Kraftstoffkanals einen Ringraum begrenzt, der über die Drosselbohrung mit der Bohrung verbunden ist. Die Drosselbohrung wird in diesem Fall über den Ringraum angeströmt. Ist dieser als Ringspalt ausgebildet kann zugleich eine Filterfunktion realisiert werden. Leakage remains thus the system, whereby the efficiency of the system continues to increase. Furthermore, it is proposed that the body of the throttle element within the fuel channel defines an annular space which is connected via the throttle bore with the bore. The throttle bore is in this case flowed through the annulus. If this is designed as an annular gap can be realized at the same time a filter function.

Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen: A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. These show:

Fig. 1 eine schematische Darstellung eines Kraftstoffeinspritzsystems, 1 is a schematic representation of a fuel injection system,

Fig. 2 einen schematischen Längsschnitt durch ein erfindungsgemäßes Fig. 2 is a schematic longitudinal section through an inventive

Drosselelement in Schließstellung,  Throttle element in the closed position,

Fig. 3 das Drosselelement der Fig. 1 in Offenstellung und Fig. 3, the throttle element of FIG. 1 in the open position and

Fig. 4 das Drosselelement der Fig. 1 in einer weiteren Schließstellung. Fig. 4, the throttle element of FIG. 1 in a further closed position.

Ausführliche Beschreibung der Zeichnungen Detailed description of the drawings

Das Kraftstoffeinspritzsystem nach Fig. 1 umfasst eine Förderpumpe 100, welche Kraftstoff 101 aus einem Vorratsbehälter 102 ansaugt und durch einen Hauptfilter 103 gefiltert zu einer Hochdruckpumpe 104 fördert. Hierbei durchläuft der Kraftstoff 101 einen Niederdruckkreis 105 - welcher hier ebenfalls nur schematisch dargestellt ist - der Hochdruckpumpe 104 und wird im Anschluss daran einer Zumesseinheit 106 zugeführt. Die Zumesseinheit 106 dosiert die Kraftstoffmenge entsprechend dem geforderten Bedarf der Brennkraftmaschine und fördert die hierüber eingestellte Kraftstoffmenge über eine Zuführleitung 107 zu einem Hochdruckkreis 108 der Hochdruckpumpe 104. Innerhalb des Hochdruckkreises 108 wird der zugeführte Kraftstoff dann auf allgemein bekannte Weise verdichtet und anschließend zu einem - hier nur teilweise dargestellten - Druckspeicher 109 geleitet, aus welchem der unter Hochdruck stehende Kraftstoff 101 zum Betrieb der Brennkraftmaschine entnommen wird. Der Niederdruckkreis 105 der Hochdruckpumpe 104 ist weiterhin über einen Rücklauf 110 mit dem Vorratsbehälter 102 verbunden, so dass über diesen Weg die durch Leckageverluste im Triebwerksraum der Hochdruckpumpe 104 seitens des The fuel injection system according to FIG. 1 comprises a feed pump 100 which draws fuel 101 from a storage container 102 and conveys it through a main filter 103 filtered to a high-pressure pump 104. Here, the fuel 101 passes through a low pressure circuit 105 - which is also shown here only schematically - the high-pressure pump 104 and is subsequently fed to a metering unit 106. The metering unit 106 meters the amount of fuel according to the required demand of the internal combustion engine and promotes the amount of fuel set via a supply line 107 to a high pressure circuit 108 of the high pressure pump 104. Within the high pressure circuit 108, the supplied fuel is then compressed in a well known manner and then to a - here only partially shown - pressure accumulator 109 passed, from which the fuel under high pressure 101 is removed for operation of the internal combustion engine. The low pressure circuit 105 of the high pressure pump 104 is further connected via a return line 110 to the reservoir 102, so that this way through the leakage losses in the engine room of the high pressure pump 104 on the part of the

Niederdruckbereichs anfallende überschüssige Kraftstoff in den Vorratsbehälter 102 zurückströmen kann. Low-pressure region resulting excess fuel can flow back into the reservoir 102.

Überschüssiger Kraftstoff, welcher durch die Zumesseinheit 106 zur Verfügung gestellt, jedoch nicht durch die Hochdruckpumpe 104 verarbeitet wird, gelangt durch einen weiteren Rücklauf 111 über ein als Nullförderdrossel dienendes Drosselelement 1 ebenfalls zurück zum Vorratsbehälter 102. Das Drosselelement 1 kann als separatesExcess fuel, which is provided by the metering unit 106, but is not processed by the high-pressure pump 104, passes through a further return 111 via a throttling element 1 serving as a zero feed throttle back to the reservoir 102. The throttle element 1 can be used as a separate

Bauteil oder als Bestandteil der Hochdruckpumpe 104 ausgebildet sein. Component or be formed as part of the high-pressure pump 104.

Das in der Fig. 2 dargestellte Drosselelement 1 umfasst einen zylindrischen Körper 2. In einem Endabschnitt 18 weist der Körper 2 ein Pressübermaß gegenüber einem Kraftstoffkanal 14 eines Gehäuseteils 15 einer Hochdruckpumpe auf, in den dasThe throttle element 1 shown in FIG. 2 comprises a cylindrical body 2. In an end portion 18, the body 2 has a Pressübermaß against a fuel passage 14 of a housing part 15 of a high-pressure pump, in which the

Drosselelement 1 gemäß dieses Ausführungsbeispiels direkt eingepresst ist. Der Presssitz dichtet zugleich eine stromaufwärts des Drosselelements 1 liegenden Zulaufbereich des Kraftstoffkanals 14 von einem Rücklauf 16 ab. In einem mittleren Bereich weist der Körper 2 eine Einschnürung 13 auf, durch welche innerhalb des Kraftstoffkanals 14 ein Ringraum 17 ausgebildet wird. Im Bereich der Einschnürung 13 ist im Körper 2 eine als Radialbohrung ausgeführte Drosselbohrung 4 ausgebildet, über welche der Ringraum 17 mit einer als Axialbohrung ausgeführten Bohrung 3 des Körpers 2 verbunden ist. Um schädliche Partikel von der Throttle element 1 is pressed directly according to this embodiment. The press fit at the same time seals an inlet region of the fuel channel 14 lying upstream of the throttle element 1 from a return 16. In a central region, the body 2 has a constriction 13, through which an annular space 17 is formed within the fuel channel 14. In the region of the constriction 13, a throttle bore 4 designed as a radial bore is formed in the body 2, via which the annular space 17 is connected to a bore 3 of the body 2 designed as an axial bore. To remove harmful particles from the

Drosselbohrung 4 fernzuhalten, ist dem Ringraum 17 ein Ringspalt 19 vorgelagert, der einen Spaltfilter ausbildet. Keep throttle bore 4, the annular space 17 is preceded by an annular gap 19, which forms a gap filter.

Um sicherzustellen, dass das Drosselelement 1 nur einer Richtung, und zwar in Richtung des Rücklaufs 16, durchströmt wird, ist in das Drosselelement 1 ein To ensure that the throttle element 1 only one direction, in the direction of the return line 16, flows through, is in the throttle element 1 a

Rückschlagventil 5 integriert. Dieses umfasst eine kugelförmiges Schließelement 8, das in der Bohrung 3 des Körpers 2 zwischen zwei Ventilsitzen 6, 7 hin und her beweglich aufgenommen ist. An dem Schließelement 8 ist eine Feder 9 abgestützt, die das Schließelement gegen einen ersten Ventilsitzes 6 vorspannt, der durch einen Absatz 10 innerhalb der Bohrung 3 ausgebildet wird. Die Feder 9 hält das Check valve 5 integrated. This comprises a spherical closing element 8, which is accommodated in the bore 3 of the body 2 between two valve seats 6, 7 reciprocally movable. On the closing element 8, a spring 9 is supported, which biases the closing element against a first valve seat 6, which is formed by a shoulder 10 within the bore 3. The spring 9 holds that

Rückschlagventil 5 geschlossen, wenn der Druck im Rücklauf 16 annähernd dem Druck im Zulaufbereich entspricht. Auf diese Weise ist sichergestellt, dass kein Kraftstoff aus dem Rücklauf 16 zurück in den Zulaufbereich gelangt. Check valve 5 is closed when the pressure in the return 16 approximately to Pressure in the inlet area corresponds. In this way it is ensured that no fuel from the return 16 passes back into the inlet area.

Um Kraftstoff aus dem Zulaufbereich in den Rücklauf 16 abzuführen, muss das Rückschlagventil 5 entgegen der Federkraft der Feder 9 geöffnet werden. Dies ist derIn order to remove fuel from the inlet area in the return line 16, the check valve 5 must be opened against the spring force of the spring 9. this is the

Fall, wenn der Druck im Zulaufbereich einen vorgegebenen Grenzwert erreicht, so dass das Schließelement 8 entgegen der Federkraft der Feder 9 vom Ventilsitz 6 abhebt (siehe Fig. 3). Bei weiter ansteigendem Druck im Zulaufbereich gelangt das Schließelement 8 zurCase, when the pressure in the inlet region reaches a predetermined limit, so that the closing element 8 lifts against the spring force of the spring 9 from the valve seat 6 (see Fig. 3). With further increasing pressure in the inlet area, the closing element 8 comes to

Anlage an dem weiteren Ventilsitz 7, der durch eine in die Bohrung 3 des Körpers 2 eingepresste Hülse 11 gebildet wird (siehe Fig. 4). Die Hülse 11 weist einen Attachment to the other valve seat 7, which is formed by a pressed-in in the bore 3 of the body 2 sleeve 11 (see Fig. 4). The sleeve 11 has a

Ringbund 12 auf, an dem die Feder 9 abgestützt ist. Ring collar 12, on which the spring 9 is supported.

Claims

Ansprüche claims 1. Drosselelement (1), insbesondere für einen Niederdruckkreis eines 1. throttle element (1), in particular for a low-pressure circuit of a Kraftstoffeinspritzsystems, insbesondere eines Common- Rail-Einspritzsystems, umfassend einen Körper (2) mit einer als Axialbohrung ausgeführten Bohrung (3), in welche eine als Radialbohrung ausgebildete Drosselbohrung (4) mündet, dadurch gekennzeichnet, dass in die Bohrung (3) ein Rückschlagventil (5) integriert ist, das mindestens einen Ventilsitz (6, 7) und ein mit dem Ventilsitz (6, 7) zusammenwirkendes Schließelement (8) umfasst.  Fuel injection system, in particular of a common rail injection system, comprising a body (2) with a bore (3) designed as an axial bore into which a throttle bore (4) designed as a radial bore opens, characterized in that into the bore (3) a check valve (5), which comprises at least one valve seat (6, 7) and a closing element (8) cooperating with the valve seat (6, 7). 2. Drosselelement (1) nach Anspruch 1, Second throttle element (1) according to claim 1, dadurch gekennzeichnet, dass das Schließelement (8) in Richtung eines ersten Ventilsitzes (6) von der Federkraft einer Feder (9) beaufschlagt ist, wobei vorzugsweise der erste Ventilsitz (6) durch einen Absatz (10) des Körpers (2) innerhalb der Bohrung (3) ausgebildet wird.  characterized in that the closing element (8) is acted upon in the direction of a first valve seat (6) by the spring force of a spring (9), wherein preferably the first valve seat (6) by a shoulder (10) of the body (2) within the bore (3) is formed. 3. Drosselelement (1) nach Anspruch 1 oder 2, 3. throttle element (1) according to claim 1 or 2, dadurch gekennzeichnet, dass das Schließelement (8) kugelförmig ausgebildet ist.  characterized in that the closing element (8) is spherical. 4. Drosselelement (1) nach einem der vorhergehenden Ansprüche, 4. throttle element (1) according to one of the preceding claims, dadurch gekennzeichnet, dass das Schließelement (8) mit einem weiteren Ventilsitz (7) zusammenwirkt, der vorzugsweise durch eine in die Bohrung (3) eingesetzte, insbesondere eingepresste, Hülse (11) ausgebildet wird.  characterized in that the closing element (8) cooperates with a further valve seat (7), which is preferably formed by a in the bore (3) inserted, in particular pressed, sleeve (11). 5. Drosselelement (1) nach Anspruch 4, 5. throttle element (1) according to claim 4, dadurch gekennzeichnet, dass die Hülse (11) einen Ringbund (12) aufweist, an dem vorzugsweise die Feder (9) abgestützt ist. characterized in that the sleeve (11) has an annular collar (12) on which preferably the spring (9) is supported. 6. Drosselelement (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Bohrung (3) als eine Sacklochbohrung ausgeführt ist. 6. throttle element (1) according to one of the preceding claims, characterized in that the bore (3) is designed as a blind hole. 7. Drosselelement (1) nach einem der vorhergehenden Ansprüche, 7. throttle element (1) according to one of the preceding claims, dadurch gekennzeichnet, dass die Drosselbohrung (4) im Bereich einer außenumfangseitigen Einschnürung (13) des Körpers (2) angeordnet ist.  characterized in that the throttle bore (4) in the region of an outer peripheral side constriction (13) of the body (2) is arranged. 8. Hochdruckpumpe, insbesondere für ein Kraftstoffeinspritzsystem, insbesondere für ein Common- Rail-Einspritzsystem, mit einem Drosselelement (1) nach einem der vorhergehenden Ansprüche. 8. High-pressure pump, in particular for a fuel injection system, in particular for a common rail injection system, with a throttle element (1) according to one of the preceding claims. 9. Hochdruckpumpe nach Anspruch 8, 9. High-pressure pump according to claim 8, dadurch gekennzeichnet, dass das Drosselelement (1) zur Ausbildung einer Nullförderdrossel in einen Kraftstoffkanal (14) der Hochdruckpumpe (104) eingesetzt, insbesondere eingepresst, ist.  characterized in that the throttle element (1) used to form a zero feed throttle in a fuel passage (14) of the high pressure pump (104), in particular pressed, is. 10. Hochdruckpumpe nach Anspruch 8, 10. High-pressure pump according to claim 8, dadurch gekennzeichnet, dass der Kraftstoffkanal (14) in einem Gehäuseteil (15) einer Hochdruckpumpe (104) ausgebildet ist und über das Drosselelement (1) an einen Rücklauf (16) des Niederdruckkreises anschließbar ist.  characterized in that the fuel channel (14) in a housing part (15) of a high pressure pump (104) is formed and via the throttle element (1) to a return line (16) of the low pressure circuit can be connected. 11. Hochdruckpumpe nach einem der Ansprüche 8 bis 10, 11. High-pressure pump according to one of claims 8 to 10, dadurch gekennzeichnet, dass der Körper (2) innerhalb des Kraftstoffkanals (14) einen Ringraum (17) begrenzt, der über die Drosselbohrung (4) mit der  characterized in that the body (2) within the fuel channel (14) defines an annular space (17) which via the throttle bore (4) with the Bohrung (3) verbunden ist.  Bore (3) is connected. 12. Niederdruckkreis eines Kraftstoffeinspritzsystems, insbesondere eines Common- Rail- Einspritzsystems, mit einem Drosselelement (1) nach einem der 12. Low pressure circuit of a fuel injection system, in particular a common rail injection system, with a throttle element (1) according to one of vorhergehenden Ansprüche 1 bis 7.  preceding claims 1 to 7.
PCT/EP2017/073991 2016-10-07 2017-09-22 Throttle element, in particular for a high-pressure pump, in particular of a low-pressure circuit of a fuel injection system Ceased WO2018065235A1 (en)

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