EP3152434A1 - High-pressure fuel pump comprising a discharge valve with a valve ball and a valve body - Google Patents

High-pressure fuel pump comprising a discharge valve with a valve ball and a valve body

Info

Publication number
EP3152434A1
EP3152434A1 EP15706759.6A EP15706759A EP3152434A1 EP 3152434 A1 EP3152434 A1 EP 3152434A1 EP 15706759 A EP15706759 A EP 15706759A EP 3152434 A1 EP3152434 A1 EP 3152434A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel pump
pressure fuel
webs
valve ball
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.)
Granted
Application number
EP15706759.6A
Other languages
German (de)
French (fr)
Other versions
EP3152434B1 (en
Inventor
Sebastian Peissner
Gerd Teike
Michael Kleindl
Soeren Stritzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3152434A1 publication Critical patent/EP3152434A1/en
Application granted granted Critical
Publication of EP3152434B1 publication Critical patent/EP3152434B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"

Definitions

  • the invention relates to a high-pressure fuel pump according to the preamble of claim 1.
  • High-pressure fuel pumps in particular piston pumps for one
  • Fuel system for an internal combustion engine are known from the market. Often, such high-pressure fuel pumps include an intake valve and an exhaust valve, which depend on a controller and / or in
  • the exhaust valve can open.
  • the problem underlying the invention is achieved by a high-pressure fuel pump according to claim 1.
  • Advantageous developments are specified in subclaims. Features which are important for the invention can also be found in the following description and in the drawings, wherein the features, both alone and in different combinations, can be important for the invention, without being explicitly referred to again.
  • the invention relates to a high-pressure fuel pump, comprising an outlet valve with a valve ball and a valve body, which has a sealing portion on which a sealing seat is present, and which has a guide portion in which the valve ball is guided.
  • the guide section comprises a first plurality of axially projecting webs, between which first
  • Flow paths are formed, wherein at least between two adjacent of the webs an opening is provided radially outward.
  • the webs can guide the valve ball radially, without severely hindering the hydraulic flow.
  • the webs have no common radially outwardly encircling collar or the like. This can be done when open
  • Outlet valve a region radially outside the webs of fuel to be flowed through, whereby a hydraulic cross section can be increased and the delivery capacity of the high-pressure fuel pump can be improved.
  • the webs are designed as free from the sealing portion axially projecting webs.
  • the webs are connected only at one axial end portion - preferably in one piece - with the valve body.
  • the hydraulic cross section can be further improved.
  • the webs have a nikringsektorartigen cross-section.
  • a radial flow formed in the region of the webs can take place with a particularly large cross section.
  • a material cross section of the webs can be optimized, whereby a fatigue strength can be improved.
  • other, for example circular or polygonal cross-sections are conceivable.
  • the valve body has a smaller outer diameter in the region of the guide section than in the region of the sealing section.
  • the valve body is in one
  • the outlet valve has a stop body for the valve ball with a
  • Stopper portion which limits the opening stroke of the valve ball, wherein the stopper body has a second plurality of radial recesses which are arranged distributed uniformly in the circumferential direction and second
  • Flow path at least partially overlaps a first flow path.
  • valve body and the stopper body can be independent of a radial angle of these elements to each other and thus simplified and cheapened.
  • Valve ball acted upon by an axial force against the sealing seat, supported on the stopper body.
  • the stopper body may be partially executed in approximately cup-shaped, wherein the valve spring is received radially within the stopper body.
  • valve spring is designed as a helical spring and in an axial direction has different diameters, in particular is waisted. This allows the function of the valve spring,
  • valve spring when the valve spring is received radially inside the stopper body to be improved.
  • a friction between the valve spring and the stopper body can be reduced or even prevented, whereby a fatigue strength can be increased.
  • the stopper body and / or the valve body are produced by a method of metal powder injection molding, MI M.
  • MI M metal powder injection molding
  • the outlet valve can be produced in a particularly simple and cost-effective manner.
  • the first plurality and the second plurality are different.
  • Opening cross-section is substantially independent of a radial angle between the guide portion and the stopper body.
  • the stopper body can be designed as a stamped part and / or deep-drawn part. This can save weight and reduce manufacturing costs.
  • Figure 1 is a simplified diagram of a high-pressure fuel pump for an internal combustion engine in a sectional view
  • FIG. 2 shows a longitudinal section through an outlet valve of the high-pressure fuel pump of FIG. 1;
  • Figure 3 is a perspective view of a valve body and a
  • Stop body of the exhaust valve similar to Figure 2, together with a valve ball and a valve spring;
  • FIG. 4 is a perspective view of the valve body of FIG. 3.
  • FIG. 1 shows a simplified diagram of a high-pressure fuel pump 10 in an axial sectional illustration.
  • the high-pressure fuel pump 10 is a Element of a fuel system, not shown, of an internal combustion engine (not shown) of a motor vehicle.
  • the high-pressure fuel pump 10 has a housing 12, in whose left portion in the drawing, an electromagnet 14 with a magnetic coil 16, an armature 18 and a
  • Anchor spring 20 is arranged.
  • the high pressure fuel pump 10 includes one with a
  • Low pressure line 22 connected to inlet 24 with an inlet valve 26, and one connected to a high pressure line 28 outlet 30 with a
  • Exhaust valve 32 A connected to the high pressure line 28
  • High-pressure accumulator (“rail") is not shown.
  • the outlet valve 32 In an open state, the outlet valve 32 is hydraulically connected via an opening 34 to a delivery chamber 36.
  • the exhaust valve 32 includes a valve ball 38 and a
  • Valve spring 40 is shown only very schematically in Figure 1. Further down in Figures 2, 3 and 4, the exhaust valve 32 will be shown and described in detail.
  • the inlet valve 26 comprises a valve spring 42 and a valve body 44.
  • the valve body 44 can be horizontal by means of a in the drawing
  • valve needle 46 moves in Figure 1 to the left, and so the inlet valve 26 by the force of the
  • Valve spring 42 are closed. If the solenoid 14 is not energized, the inlet valve 26 can through the
  • a piston 48 is arranged vertically movable in the drawing.
  • the piston 48 can be moved by means of a roller 50 from a - in this case elliptical - cam 52 in a cylinder 54.
  • the cylinder 54 is formed in a portion of the housing 12.
  • the inlet valve 26 is connected via an opening 56 with the
  • Delivery chamber 36 hydraulically connected.
  • the high pressure fuel pump 10 delivers fuel from the inlet 24 to the outlet 30, the outlet valve 32 opening or closing in accordance with a respective pressure differential between the delivery chamber 36 and the outlet 30 and the high pressure line 28, respectively.
  • the inlet valve 26 is at Full delivery of a respective pressure difference between the inlet 24 and the delivery chamber 36 is acted upon at General Cincinnati but also through the valve needle 46 and the solenoid 14.
  • Figure 2 shows an axial sectional view of the exhaust valve 32, which is arranged in the housing 12 of the high-pressure fuel pump 10 is. In principle, however, it is also conceivable that the housing of the outlet valve 32 is separate from the housing 12 of the high-pressure fuel pump 10.
  • the outlet valve 32 is designed essentially rotationally symmetrical or radially symmetrical and comprises four elements: a valve body 58 (in the drawing on the left), a stop body 60 (in the drawing on the right), the valve ball arranged axially centrally between the valve body 58 and the stop body 60 38, and designed as a helical spring valve spring 40.
  • the valve spring 40 acts on the valve ball 38 in the closing direction and is received in a recess 62 of the stopper body 60. In this case, the valve spring 40 is supported on a floor (right in the drawing, without
  • the boundary surface of the recess 62 forms a guide for the valve spring 40.
  • the recess 62 has a simple cylindrical cross-section.
  • the bottom has an axial centric opening 64, which has a smaller diameter than the valve spring 40.
  • the valve spring 40 in an axial direction (continuous) on different diameters and is designed here waisted.
  • Stop body 60 forms an annular stop portion 66 for the valve ball 38. Thus, the stop body 60 limited by the
  • Stopper portion 66 an opening stroke of the valve ball 38th
  • a linear annular sealing seat 68 is formed on the valve body 58.
  • the valve body 58 has a guide portion 70, in which the valve ball 38 is guided radially.
  • the guide section 70 comprises a first plurality of axially projecting webs
  • the webs 72 protrude freely from the sealing seat 68 comprising a sealing portion in the axial direction, that is, for example, not surrounded by a common collar or the like, which would possibly create a bottleneck for the hydraulic flow.
  • a first plurality of recesses 73 are present radially between the webs 72, which form first flow paths 74 and an opening 75 leading radially from the interior of the guide section 70.
  • first flow paths 74 In an axial region of the first flow paths 74 is the
  • Guide portion 70 corresponding to the first plurality of webs 72 executed radially symmetrically.
  • an inner diameter of the housing 12 is made larger than in a left in Figure 2 area, so that there is a particularly large hydraulic cross-section in the region of the openings 75.
  • the stopper body 60 has radially on its outer side, that is outside of the recess 62 on a second plurality of recesses 76 which are arranged distributed uniformly in the circumferential direction and second
  • Recesses 76 executed radially symmetrically.
  • the first plurality and the second plurality are different and amount to three
  • valve body 58 and the stopper body 60 are arranged axially spaced by a small amount (without reference numeral)
  • valve body 58 and the stopper body 60 are arranged without spacing axially to each other.
  • the stopper body 60 and / or the valve body 58 are frictionally arranged in the housing 12 by a radially outer surface of the stopper body 60 and the valve body 58 is pressed against a radially inner wall portion of the housing 12, for example. It is understood that for the arrangement of the stopper body 60 and / or the valve body 58 in the housing 12, other techniques other than pressing in accordance with the invention are possible.
  • the valve ball 38 is made of one
  • the stopper body 60 and the valve body 58 are herein made by a method of metal powder injection molding, MIM. Alternatively, the stopper body 60 by means of punching and
  • the exhaust valve 32 is sized so that in an open state of the exhaust valve 32, a resulting hydraulic cross-sectional area is sufficiently large to deliver a required amount of fuel with a comparatively small hydraulic flow resistance.
  • a fuel pressure in the delivery chamber 36 and in a region of the opening 34 is smaller than a
  • Valve spring 40 the valve ball 38 in the drawing to the left against the
  • the valve ball 38 can lift off from the sealing seat 68 in the drawing to the right.
  • the exhaust valve 32 is thus open.
  • valve ball 38 can be pressed in the drawing to the right as far as the stop portion 66. This results in a
  • valve ball 38 For the valve ball 38.
  • a dashed line 80 indicates the position of the valve ball 38 in this extreme case. It can be seen that the valve body 58 and the stopper body 60 allow a radial guidance of the valve ball 38, see also the following FIGS. 3 and 4.
  • An arrow 82 illustrates a resulting flow of the fuel when the exhaust valve 32 is opened.
  • the flow takes place in the drawing from left to right through the opening 34, then past the valve ball 38, then partially first through the openings 75 radially outwardly and partially directly through the first flow paths 74 in the valve body 58, then through the second flow paths 78 in the stopper body 60, then in the High-pressure line 28 and to the high-pressure accumulator, not shown.
  • the free-projecting webs 72 formed on the valve body 58 a particularly large hydraulic cross-section is made possible with the outlet valve 32 open.
  • FIG. 3 shows a perspective view of the outlet valve 32.
  • FIG. 4 shows a view, similar to FIG. 3, of the valve body 58 alone. It can be seen that the valve body 58 is radially symmetrical in a region of the guide section 70 and in the present case comprises three axially projecting webs 72 and correspondingly three first flow paths 74 and three openings 75.
  • the webs 72 have a circular sector-like cross-section.
  • Guide portion 70 has a smaller outer diameter than in the region of the sealing seat 68 comprehensive sealing portion. As a result, the webs 72 can also be flowed around radially on the outside of the fuel, whereby an improved hydraulic cross-section can result when the outlet valve 32 is open. In addition, the guide portion 70 can because of the smaller
  • the stopper body 60 is likewise designed to be radially symmetrical in a region of the recesses 76 and, in the present case, comprises five second flow paths 78, wherein, for reasons of
  • Clarity only one is provided with a reference numeral.
  • the cross-sectional areas of the second flow paths 78 are selected such that, regardless of the radial orientation of the stop body 60 relative to the valve body 58, at least one of the second flow paths 78 at least partially overlaps one of the first flow paths 74.
  • the first plurality and the second plurality are different, so to speak, there is a radial "interference" between the first three and the five second flow paths 74 and 78. This results in a total resulting hydraulic opening cross-section of the exhaust valve 32 is substantially independent of a random radial mounting angle between the guide portion 70 and the stopper body 60.

Abstract

The invention relates to a high-pressure fuel pump (10) comprising a discharge valve (32) with a valve ball (38) and a valve body (58), said body having a sealing section provided with a sealing seat (68) and having a guiding section (70), in which the valve ball is guided (38). According to the invention, the guiding section (70) has a first plurality of axially projecting lands (72), between which first flow paths (74) are formed, and a gap (75) facing radially outwards is situated at least between two adjacent lands (72).

Description

Beschreibung Titel  Description title
Kraftstoff-Hochdruckpumpe, mit einem Auslassventil mit einer Ventilkuqel und einem Ventilkörper  High-pressure fuel pump, with an outlet valve with a Ventilkuqel and a valve body
Stand der Technik State of the art
Die Erfindung betrifft eine Kraftstoff-Hochdruckpumpe nach dem Oberbegriff des Anspruchs 1. The invention relates to a high-pressure fuel pump according to the preamble of claim 1.
Kraftstoff-Hochdruckpumpen, insbesondere Kolbenpumpen für ein High-pressure fuel pumps, in particular piston pumps for one
Kraftstoffsystem für eine Brennkraftmaschine, sind vom Markt her bekannt. Häufig umfassen solche Kraftstoff-Hochdruckpumpen ein Einlassventil und ein Auslassventil, welche in Abhängigkeit von einer Steuerung und/oder in Fuel system for an internal combustion engine, are known from the market. Often, such high-pressure fuel pumps include an intake valve and an exhaust valve, which depend on a controller and / or in
Abhängigkeit von einem Kraftstoffdruck öffnen und schließen können. Das Auslassventil ermöglicht es, einen unter Druck stehenden Kraftstoffspeicher ("Rail") gegen einen Förderraum der Kraftstoff-Hochdruckpumpe während eines Saughubes zu verschließen. Wenn dagegen ein Kraftstoffdruck in dem Dependence on a fuel pressure can open and close. The exhaust valve makes it possible to close a pressurized fuel reservoir ("rail") against a delivery chamber of the high-pressure fuel pump during a suction stroke. In contrast, when a fuel pressure in the
Förderraum eine durch den Druck in dem Kraftstoffspeicher bedingte Gegenkraft zuzüglich einer Schließfederkraft übersteigt, so kann das Auslassventil öffnen. Delivery chamber exceeds a conditional by the pressure in the fuel accumulator opposing force plus a closing spring force, the exhaust valve can open.
Offenbarung der Erfindung Disclosure of the invention
Das der Erfindung zugrunde liegende Problem wird durch eine Kraftstoff- Hochdruckpumpe nach Anspruch 1 gelöst. Vorteilhafte Weiterbildungen sind in Unteransprüchen angegeben. Für die Erfindung wichtige Merkmale finden sich ferner in der nachfolgenden Beschreibung und in den Zeichnungen, wobei die Merkmale sowohl in Alleinstellung als auch in unterschiedlichen Kombinationen für die Erfindung wichtig sein können, ohne dass hierauf nochmals explizit hingewiesen wird. Die Erfindung betrifft eine Kraftstoff-Hochdruckpumpe, mit einem Auslassventil mit einer Ventilkugel und einem Ventilkörper, der einen Dichtabschnitt aufweist, an dem ein Dichtsitz vorhanden ist, und der einen Führungsabschnitt aufweist, in dem die Ventilkugel geführt ist. Erfindungsgemäß umfasst der Führungsabschnitt eine erste Mehrzahl von axial abragenden Stegen, zwischen denen erste The problem underlying the invention is achieved by a high-pressure fuel pump according to claim 1. Advantageous developments are specified in subclaims. Features which are important for the invention can also be found in the following description and in the drawings, wherein the features, both alone and in different combinations, can be important for the invention, without being explicitly referred to again. The invention relates to a high-pressure fuel pump, comprising an outlet valve with a valve ball and a valve body, which has a sealing portion on which a sealing seat is present, and which has a guide portion in which the valve ball is guided. According to the invention, the guide section comprises a first plurality of axially projecting webs, between which first
Strömungswege gebildet sind, wobei mindestens zwischen zwei benachbarten der Stege eine Öffnung nach radial außen vorhanden ist. Somit können die Stege die Ventilkugel radial führen, ohne dabei die hydraulische Strömung stark zu behindern. Insbesondere weisen die Stege keinen gemeinsamen radial außen umlaufenden Kragen oder dergleichen auf. Dadurch kann bei geöffnetem  Flow paths are formed, wherein at least between two adjacent of the webs an opening is provided radially outward. Thus, the webs can guide the valve ball radially, without severely hindering the hydraulic flow. In particular, the webs have no common radially outwardly encircling collar or the like. This can be done when open
Auslassventil ein Bereich radial außerhalb der Stege von Kraftstoff durchströmt werden, wodurch ein hydraulischer Querschnitt vergrößert und die Förderleistung der Kraftstoff-Hochdruckpumpe verbessert werden kann.  Outlet valve, a region radially outside the webs of fuel to be flowed through, whereby a hydraulic cross section can be increased and the delivery capacity of the high-pressure fuel pump can be improved.
In einer Ausgestaltung der Kraftstoff-Hochdruckpumpe sind die Stege als vom Dichtabschnitt frei axial abragende Stege ausgebildet. Somit sind die Stege nur an einem axialen Endabschnitt - vorzugsweise einstückig - mit dem Ventilkörper verbunden. Damit kann der hydraulische Querschnitt zusätzlich verbessert werden. In one embodiment of the high-pressure fuel pump, the webs are designed as free from the sealing portion axially projecting webs. Thus, the webs are connected only at one axial end portion - preferably in one piece - with the valve body. Thus, the hydraulic cross section can be further improved.
Weiterhin kann vorgesehen sein, dass die Stege einen kreisringsektorartigen Querschnitt aufweisen. Dadurch kann bei geöffnetem Auslassventil eine im Bereich der Stege gebildete radiale Strömung mit besonders großem Querschnitt erfolgen. Zugleich kann ein Materialquerschnitt der Stege optimiert sein, wodurch eine Dauerfestigkeit verbessert werden kann. Alternativ sind aber auch andere, beispielsweise kreisförmige oder vieleckige Querschnitte denkbar. Furthermore, it can be provided that the webs have a kreisringsektorartigen cross-section. As a result, when the outlet valve is open, a radial flow formed in the region of the webs can take place with a particularly large cross section. At the same time, a material cross section of the webs can be optimized, whereby a fatigue strength can be improved. Alternatively, however, other, for example circular or polygonal cross-sections are conceivable.
In einer Ausgestaltung der Kraftstoff-Hochdruckpumpe weist der Ventilkörper im Bereich des Führungsabschnitts einen kleineren Außendurchmesser auf als im Bereich des Dichtabschnitts. Beispielsweise ist der Ventilkörper in einem In one embodiment of the high-pressure fuel pump, the valve body has a smaller outer diameter in the region of the guide section than in the region of the sealing section. For example, the valve body is in one
Gehäuse der Kraftstoff-Hochdruckpumpe angeordnet, vorzugsweise in dieses eingepresst. Dann kann ein radialer Bereich zwischen den Stegen und dem Gehäuse vorteilhaft für die hydraulische Strömung ausgenutzt werden, wodurch der hydraulische Querschnitt weiter verbessert werden kann. Außerdem kann der Führungsabschnitt wegen des kleineren Außendurchmessers von einem radial äußeren Pressbereich an dem Ventilkörper entkoppelt werden. In einer weiteren Ausgestaltung der Kraftstoff-Hochdruckpumpe weist das Auslassventil einen Anschlagkörper für die Ventilkugel mit einem Housing the fuel high-pressure pump arranged, preferably pressed into this. Then, a radial area between the webs and the housing can advantageously be utilized for the hydraulic flow, whereby the hydraulic cross section can be further improved. In addition, because of the smaller outer diameter, the guide section can be decoupled from a radially outer pressing area on the valve body. In a further embodiment of the high-pressure fuel pump, the outlet valve has a stop body for the valve ball with a
Anschlagabschnitt auf, der den Öffnungshub der Ventilkugel begrenzt, wobei der Anschlagkörper eine zweite Mehrzahl von radialen Ausnehmungen aufweist, die in Umfangsrichtung gleichmäßig verteilt angeordnet sind und zweite Stopper portion which limits the opening stroke of the valve ball, wherein the stopper body has a second plurality of radial recesses which are arranged distributed uniformly in the circumferential direction and second
Strömungswege bilden, wobei die Querschnittsflächen und/oder die zweite Mehrzahl der zweiten Strömungswege derart gewählt sind, dass unabhängig von der radialen Ausrichtung des Anschlagkörpers mindestens ein zweiter Forming flow paths, wherein the cross-sectional areas and / or the second plurality of second flow paths are selected such that regardless of the radial orientation of the stopper body at least a second
Strömungsweg einen ersten Strömungsweg wenigstens teilweise überlappt. Dadurch wird eine besonders zweckmäßige Ausgestaltung der Flow path at least partially overlaps a first flow path. This will be a particularly advantageous embodiment of
erfindungsgemäßen Kraftstoff-Hochdruckpumpe beschrieben. Insbesondere kann eine Montage des Ventilkörpers und des Anschlagkörpers unabhängig von einem radialen Winkel dieser Elemente zueinander erfolgen und somit vereinfacht und verbilligt werden. Fuel high-pressure pump according to the invention described. In particular, an assembly of the valve body and the stopper body can be independent of a radial angle of these elements to each other and thus simplified and cheapened.
Weiterhin kann vorgesehen sein, dass sich eine Ventilfeder, welche die Furthermore, it can be provided that a valve spring, which the
Ventilkugel mit einer axialen Kraft gegen den Dichtsitz beaufschlagt, an dem Anschlagkörper abstützt. Insbesondere kann der Anschlagkörper teilweise in etwa topfförmig ausgeführt sein, wobei die Ventilfeder radial innerhalb des Anschlagkörpers aufgenommen ist. Dadurch kann das Auslassventil und somit die erfindungsgemäße Kraftstoff-Hochdruckpumpe besonders kompakt bauen. Valve ball acted upon by an axial force against the sealing seat, supported on the stopper body. In particular, the stopper body may be partially executed in approximately cup-shaped, wherein the valve spring is received radially within the stopper body. As a result, the outlet valve and thus the high-pressure fuel pump according to the invention can be made particularly compact.
Ergänzend kann vorgesehen sein, dass die Ventilfeder als Schraubenfeder ausgeführt ist und in einer axialen Richtung verschiedene Durchmesser aufweist, insbesondere tailliert ist. Dadurch kann die Funktion der Ventilfeder, In addition, it may be provided that the valve spring is designed as a helical spring and in an axial direction has different diameters, in particular is waisted. This allows the function of the valve spring,
insbesondere wenn die Ventilfeder radial innerhalb des Anschlagkörpers aufgenommen ist, verbessert werden. Insbesondere kann durch die Taillierung eine Reibung zwischen der Ventilfeder und dem Anschlagkörper verkleinert oder sogar verhindert werden, wodurch eine Dauerfestigkeit erhöht werden kann. in particular, when the valve spring is received radially inside the stopper body to be improved. In particular, by the sidecut a friction between the valve spring and the stopper body can be reduced or even prevented, whereby a fatigue strength can be increased.
In einer Ausgestaltung der Kraftstoff-Hochdruckpumpe sind der Anschlagkörper und/oder der Ventilkörper nach einem Verfahren des Metall-Pulverspritzgießens, MI M, hergestellt. Dadurch kann das Auslassventil besonders einfach und kostengünstig hergestellt werden. Weiterhin kann vorgesehen sein, dass die erste Mehrzahl und die zweite Mehrzahl unterschiedlich sind. Dadurch wird vor allem bei radial gleichmäßiger Verteilung der Stege bzw. der Ausnehmungen erreicht, dass sich sozusagen eine radiale "Interferenz" zwischen den ersten und den zweiten Strömungswegen ergibt, wodurch ein in der Summe sich ergebender hydraulischer In one embodiment of the high-pressure fuel pump, the stopper body and / or the valve body are produced by a method of metal powder injection molding, MI M. As a result, the outlet valve can be produced in a particularly simple and cost-effective manner. Furthermore, it can be provided that the first plurality and the second plurality are different. As a result, in particular with a radially uniform distribution of the webs or the recesses, a radial "interference" results, as it were, between the first and the second flow paths, as a result of which a total of resulting hydraulic
Öffnungsquerschnitt im Wesentlichen unabhängig von einem radialen Winkel zwischen dem Führungsabschnitt und dem Anschlagkörper ist. Dadurch wird die Funktion des Auslassventils verbessert und die Montage vereinfacht, da die Elemente in Umfangsrichtung nicht ausgerichtet werden brauchen. Opening cross-section is substantially independent of a radial angle between the guide portion and the stopper body. As a result, the function of the exhaust valve is improved and the assembly is simplified because the elements need not be aligned in the circumferential direction.
Alternativ zu einer Herstellung nach einem Verfahren des Metall- Pulverspritzgießens kann insbesondere der Anschlagkörper als Stanzteil und/oder Tiefziehteil ausgeführt sein. Dadurch können Gewicht gespart und Herstellkosten gesenkt werden. As an alternative to a production by a method of metal powder injection molding, in particular, the stopper body can be designed as a stamped part and / or deep-drawn part. This can save weight and reduce manufacturing costs.
Nachfolgend werden beispielhafte Ausführungsformen der Erfindung unter Bezugnahme auf die Zeichnung erläutert. In der Zeichnung zeigen: Hereinafter, exemplary embodiments of the invention will be explained with reference to the drawings. In the drawing show:
Figur 1 ein vereinfachtes Schema einer Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine in einer Schnittdarstellung; Figure 1 is a simplified diagram of a high-pressure fuel pump for an internal combustion engine in a sectional view;
Figur 2 einen Längsschnitt durch ein Auslassventil der Kraftstoff- Hochdruckpumpe von Figur 1 ; FIG. 2 shows a longitudinal section through an outlet valve of the high-pressure fuel pump of FIG. 1;
Figur 3 eine perspektivische Darstellung eines Ventilkörpers und eines Figure 3 is a perspective view of a valve body and a
Anschlagkörpers des Auslassventils, ähnlich zu Figur 2, zusammen mit einer Ventilkugel und einer Ventilfeder; und  Stop body of the exhaust valve, similar to Figure 2, together with a valve ball and a valve spring; and
Figur 4 eine perspektivische Darstellung des Ventilkörpers von Figur 3. FIG. 4 is a perspective view of the valve body of FIG. 3.
Es werden für funktionsäquivalente Elemente und Größen in allen Figuren auch bei unterschiedlichen Ausführungsformen die gleichen Bezugszeichen verwendet. The same reference numerals are used for functionally equivalent elements and sizes in all figures, even in different embodiments.
Figur 1 zeigt ein vereinfachtes Schema einer Kraftstoff-Hochdruckpumpe 10 in einer axialen Schnittdarstellung. Die Kraftstoff-Hochdruckpumpe 10 ist ein Element eines nicht dargestellten Kraftstoff Systems einer nicht dargestellten Brennkraftmaschine eines Kraftfahrzeugs. Die Kraftstoff-Hochdruckpumpe 10 weist ein Gehäuse 12 auf, in dessen in der Zeichnung linkem Abschnitt ein Elektromagnet 14 mit einer Magnetspule 16, einem Anker 18 und einer FIG. 1 shows a simplified diagram of a high-pressure fuel pump 10 in an axial sectional illustration. The high-pressure fuel pump 10 is a Element of a fuel system, not shown, of an internal combustion engine (not shown) of a motor vehicle. The high-pressure fuel pump 10 has a housing 12, in whose left portion in the drawing, an electromagnet 14 with a magnetic coil 16, an armature 18 and a
Ankerfeder 20 angeordnet ist. Anchor spring 20 is arranged.
Weiterhin umfasst die Kraftstoff-Hochdruckpumpe 10 einen mit einer Furthermore, the high pressure fuel pump 10 includes one with a
Niederdruckleitung 22 verbundenen Einlass 24 mit einem Einlassventil 26, und einen mit einer Hochdruckleitung 28 verbundenen Auslass 30 mit einem Low pressure line 22 connected to inlet 24 with an inlet valve 26, and one connected to a high pressure line 28 outlet 30 with a
Auslassventil 32. Ein an die Hochdruckleitung 28 angeschlossener Exhaust valve 32. A connected to the high pressure line 28
Hochdruckspeicher ("Rail") ist nicht dargestellt. In einem geöffneten Zustand ist das Auslassventil 32 über eine Öffnung 34 mit einem Förderraum 36 hydraulisch verbunden. Das Auslassventil 32 umfasst eine Ventilkugel 38 sowie eine  High-pressure accumulator ("rail") is not shown. In an open state, the outlet valve 32 is hydraulically connected via an opening 34 to a delivery chamber 36. The exhaust valve 32 includes a valve ball 38 and a
Ventilfeder 40 und ist in der Figur 1 nur sehr schematisch dargestellt. Weiter unten bei den Figuren 2, 3 und 4 wird das Auslassventil 32 noch im Detail gezeigt und beschrieben werden. Valve spring 40 and is shown only very schematically in Figure 1. Further down in Figures 2, 3 and 4, the exhaust valve 32 will be shown and described in detail.
Das Einlassventil 26 umfasst eine Ventilfeder 42 sowie einen Ventilkörper 44. Der Ventilkörper 44 kann mittels einer in der Zeichnung horizontal The inlet valve 26 comprises a valve spring 42 and a valve body 44. The valve body 44 can be horizontal by means of a in the drawing
verschiebbaren und mit dem Anker 18 gekoppelten Ventilnadel 46 bewegt werden. Ist der Elektromagnet 14 bestromt, bewegt sich die Ventilnadel 46 in Figur 1 nach links, und so kann das Einlassventil 26 durch die Kraft der slidable and coupled to the armature 18 valve needle 46 are moved. If the solenoid 14 is energized, the valve needle 46 moves in Figure 1 to the left, and so the inlet valve 26 by the force of the
Ventilfeder 42 geschlossen werden. Ist der Elektromagnet 14 nicht bestromt, so kann das Einlassventil 26 durch dieValve spring 42 are closed. If the solenoid 14 is not energized, the inlet valve 26 can through the
Kraft der Ankerfeder 20 zwangsweise geöffnet werden. In dem Förderraum 36 ist ein Kolben 48 in der Zeichnung vertikal bewegbar angeordnet. Der Kolben 48 kann mittels einer Rolle 50 von einem - vorliegend elliptischen - Nocken 52 in einem Zylinder 54 bewegt werden. Der Zylinder 54 ist in einem Abschnitt des Gehäuses 12 gebildet. Das Einlassventil 26 ist über eine Öffnung 56 mit demForce of the armature spring 20 are forcibly opened. In the delivery chamber 36, a piston 48 is arranged vertically movable in the drawing. The piston 48 can be moved by means of a roller 50 from a - in this case elliptical - cam 52 in a cylinder 54. The cylinder 54 is formed in a portion of the housing 12. The inlet valve 26 is connected via an opening 56 with the
Förderraum 36 hydraulisch verbunden. Delivery chamber 36 hydraulically connected.
Im Betrieb fördert die Kraftstoff-Hochdruckpumpe 10 Kraftstoff von dem Einlass 24 zu dem Auslass 30, wobei das Auslassventil 32 entsprechend einem jeweiligen Druckunterschied zwischen dem Förderraum 36 und dem Auslass 30 bzw. der Hochdruckleitung 28 öffnet oder schließt. Das Einlassventil 26 wird bei Vollförderung von einem jeweiligen Druckunterschied zwischen dem Einlass 24 und dem Förderraum 36 beaufschlagt, bei Teilförderung jedoch außerdem durch die Ventilnadel 46 bzw. den Elektromagneten 14. Figur 2 zeigt eine axiale Schnittdarstellung des Auslassventils 32, welches in dem Gehäuse 12 der Kraftstoff-Hochdruckpumpe 10 angeordnet ist. Denkbar ist grundsätzlich aber auch, dass das Gehäuse des Auslassventils 32 vom Gehäuse 12 der Kraftstoff-Hochdruckpumpe 10 separat ist. Das Auslassventil 32 ist im Wesentlichen rotationssymmetrisch bzw. radialsymmetrisch ausgeführt und umfasst vorliegend vier Elemente: Einen Ventilkörper 58 (in der Zeichnung links), einen Anschlagkörper 60 (in der Zeichnung rechts), die axial zentrisch zwischen dem Ventilkörper 58 und dem Anschlagkörper 60 angeordnete Ventilkugel 38, und die als Schraubenfeder ausgeführte Ventilfeder 40. Die Ventilfeder 40 beaufschlagt die Ventilkugel 38 in Schließrichtung und ist in einer Ausnehmung 62 des Anschlagkörpers 60 aufgenommen. Dabei stützt sich die Ventilfeder 40 an einem Boden (in der Zeichnung rechts, ohne In operation, the high pressure fuel pump 10 delivers fuel from the inlet 24 to the outlet 30, the outlet valve 32 opening or closing in accordance with a respective pressure differential between the delivery chamber 36 and the outlet 30 and the high pressure line 28, respectively. The inlet valve 26 is at Full delivery of a respective pressure difference between the inlet 24 and the delivery chamber 36 is acted upon at Teilförderung but also through the valve needle 46 and the solenoid 14. Figure 2 shows an axial sectional view of the exhaust valve 32, which is arranged in the housing 12 of the high-pressure fuel pump 10 is. In principle, however, it is also conceivable that the housing of the outlet valve 32 is separate from the housing 12 of the high-pressure fuel pump 10. The outlet valve 32 is designed essentially rotationally symmetrical or radially symmetrical and comprises four elements: a valve body 58 (in the drawing on the left), a stop body 60 (in the drawing on the right), the valve ball arranged axially centrally between the valve body 58 and the stop body 60 38, and designed as a helical spring valve spring 40. The valve spring 40 acts on the valve ball 38 in the closing direction and is received in a recess 62 of the stopper body 60. In this case, the valve spring 40 is supported on a floor (right in the drawing, without
Bezugszeichen) des Anschlagkörpers 60 ab. Eine radial innere Reference numeral) of the stopper body 60 from. A radially inner
Begrenzungsfläche der Ausnehmung 62 bildet eine Führung für die Ventilfeder 40. Die Ausnehmung 62 weist einen einfachen zylindrischen Querschnitt auf. DerThe boundary surface of the recess 62 forms a guide for the valve spring 40. The recess 62 has a simple cylindrical cross-section. Of the
Boden weist eine axiale zentrische Öffnung 64 auf, welche einen kleineren Durchmesser aufweist als die Ventilfeder 40. In der in Figur 2 dargestellten Ausführungsform des Auslassventils 32 weist die Ventilfeder 40 in einer axialen Richtung (stetig) verschiedene Durchmesser auf und ist vorliegend tailliert ausgeführt. The bottom has an axial centric opening 64, which has a smaller diameter than the valve spring 40. In the embodiment of the outlet valve 32 shown in Figure 2, the valve spring 40 in an axial direction (continuous) on different diameters and is designed here waisted.
Ein der Ventilkugel 38 zugewandter Rand der Ausnehmung 62 in dem One of the valve ball 38 facing edge of the recess 62 in the
Anschlagkörper 60 bildet einen ringförmigen Anschlagabschnitt 66 für die Ventilkugel 38. Somit begrenzt der Anschlagkörper 60 mittels des Stop body 60 forms an annular stop portion 66 for the valve ball 38. Thus, the stop body 60 limited by the
Anschlagabschnitts 66 einen Öffnungshub der Ventilkugel 38. Stopper portion 66 an opening stroke of the valve ball 38th
An dem Ventilkörper 58 ist ein linienhafter ringförmiger Dichtsitz 68 ausgebildet. In der Zeichnung rechts von dem Dichtsitz 68 weist der Ventilkörper 58 einen Führungsabschnitt 70 auf, in dem die Ventilkugel 38 radial geführt ist. Der Führungsabschnitt 70 umfasst eine erste Mehrzahl von axial abragenden StegenOn the valve body 58, a linear annular sealing seat 68 is formed. In the drawing to the right of the sealing seat 68, the valve body 58 has a guide portion 70, in which the valve ball 38 is guided radially. The guide section 70 comprises a first plurality of axially projecting webs
72, die in Umfangsrichtung gleichmäßig verteilt angeordnet sind und als radiale Führung für die Ventilkugel 38 dienen. Insbesondere ist zu erkennen, dass die Stege 72 von einem den Dichtsitz 68 umfassenden Dichtabschnitt in axialer Richtung frei abragen, also beispielsweise nicht von einem gemeinsamen Kragen oder dergleichen umschlossen sind, wodurch gegebenenfalls eine Engstelle für die hydraulische Strömung entstünde. 72, which are arranged distributed uniformly in the circumferential direction and as a radial Serve guide for the valve ball 38. In particular, it can be seen that the webs 72 protrude freely from the sealing seat 68 comprising a sealing portion in the axial direction, that is, for example, not surrounded by a common collar or the like, which would possibly create a bottleneck for the hydraulic flow.
Entsprechend ist radial zwischen den Stegen 72 eine erste Mehrzahl von Ausnehmungen 73 vorhanden, welche erste Strömungswege 74 und eine vom Inneren des Führungsabschnitts 70 nach radial außen führende Öffnung 75 bilden. In einem axialen Bereich der ersten Strömungswege 74 ist der Correspondingly, a first plurality of recesses 73 are present radially between the webs 72, which form first flow paths 74 and an opening 75 leading radially from the interior of the guide section 70. In an axial region of the first flow paths 74 is the
Führungsabschnitt 70 entsprechend der ersten Mehrzahl der Stege 72 radialsymmetrisch ausgeführt. In einem radial äußeren Bereich der Stege 72 und der Öffnungen 75 ist ein Innendurchmesser des Gehäuses 12 größer ausgeführt als in einem in der Figur 2 linken Bereich, so dass sich im Bereich der Öffnungen 75 ein besonders großer hydraulischer Querschnitt ergibt. Guide portion 70 corresponding to the first plurality of webs 72 executed radially symmetrically. In a radially outer region of the webs 72 and the openings 75, an inner diameter of the housing 12 is made larger than in a left in Figure 2 area, so that there is a particularly large hydraulic cross-section in the region of the openings 75.
Der Anschlagkörper 60 weist radial auf seiner Außenseite, also außerhalb von der Ausnehmung 62 eine zweite Mehrzahl von Ausnehmungen 76 auf, die in Umfangsrichtung gleichmäßig verteilt angeordnet sind und zweite The stopper body 60 has radially on its outer side, that is outside of the recess 62 on a second plurality of recesses 76 which are arranged distributed uniformly in the circumferential direction and second
Strömungswege 78 bilden. In einem axialen Bereich der zweiten Strömungswege 78 ist der Anschlagkörper 60 entsprechend der zweiten Mehrzahl der Form flow paths 78. In an axial region of the second flow paths 78, the stopper body 60 corresponding to the second plurality of
Ausnehmungen 76 radialsymmetrisch ausgeführt. Vorliegend sind die erste Mehrzahl und die zweite Mehrzahl unterschiedlich und betragen drei Recesses 76 executed radially symmetrically. In the present case, the first plurality and the second plurality are different and amount to three
beziehungsweise fünf, vergleiche die folgenden Figuren 3 und 4. or five, compare the following figures 3 and 4.
In der Figur 2 sind der Ventilkörper 58 und der Anschlagkörper 60 um ein geringes Maß (ohne Bezugszeichen) axial beabstandet angeordnet bzw. In the figure 2, the valve body 58 and the stopper body 60 are arranged axially spaced by a small amount (without reference numeral)
dargestellt. In einer nicht gezeigten Ausführungsform des Auslassventils 32 sind der Ventilkörper 58 und der Anschlagkörper 60 ohne Abstand axial zueinander angeordnet. Vorzugsweise sind der Anschlagkörper 60 und/oder der Ventilkörper 58 kraftschlüssig in dem Gehäuse 12 angeordnet, indem eine radial äußere Fläche des Anschlagkörpers 60 bzw. des Ventilkörpers 58 an einem radial inneren Wandabschnitt des Gehäuses 12 beispielsweise eingepresst ist. Es versteht sich, dass zur Anordnung des Anschlagkörpers 60 und/oder des Ventilkörpers 58 in dem Gehäuse 12 auch andere Techniken außer Einpressen erfindungsgemäß möglich sind. In der Ausführungsform gemäß Figur 2 ist die Ventilkugel 38 aus einem shown. In an embodiment of the exhaust valve 32, not shown, the valve body 58 and the stopper body 60 are arranged without spacing axially to each other. Preferably, the stopper body 60 and / or the valve body 58 are frictionally arranged in the housing 12 by a radially outer surface of the stopper body 60 and the valve body 58 is pressed against a radially inner wall portion of the housing 12, for example. It is understood that for the arrangement of the stopper body 60 and / or the valve body 58 in the housing 12, other techniques other than pressing in accordance with the invention are possible. In the embodiment according to FIG. 2, the valve ball 38 is made of one
Stahlwerkstoff gefertigt. Der Anschlagkörper 60 und der Ventilkörper 58 sind vorliegend nach einem Verfahren des Metall-Pulverspritzgießens, MIM, hergestellt. Alternativ kann der Anschlagkörper 60 mittels Stanzen und Made of steel material. The stopper body 60 and the valve body 58 are herein made by a method of metal powder injection molding, MIM. Alternatively, the stopper body 60 by means of punching and
Tiefziehen hergestellt sein. Insgesamt ist das Auslassventil 32 derart bemessen bzw. ausgeführt, dass in einem geöffneten Zustand des Auslassventils 32 eine sich ergebende hydraulische Querschnittsfläche ausreichend groß ist, um eine erforderliche Kraftstoffmenge bei einem vergleichsweise geringen hydraulischen Strömungswiderstand zu fördern.  Be made deep drawing. Overall, the exhaust valve 32 is sized so that in an open state of the exhaust valve 32, a resulting hydraulic cross-sectional area is sufficiently large to deliver a required amount of fuel with a comparatively small hydraulic flow resistance.
Wenn im Betrieb der Kraftstoff-Hochdruckpumpe 10 ein Kraftstoff druck in dem Förderraum 36 bzw. in einem Bereich der Öffnung 34 kleiner ist als ein During operation of the high-pressure fuel pump 10, a fuel pressure in the delivery chamber 36 and in a region of the opening 34 is smaller than a
Kraftstoffdruck in einem Bereich der Ausnehmung 62 plus der Kraft der Fuel pressure in a region of the recess 62 plus the force of
Ventilfeder 40, so wird die Ventilkugel 38 in der Zeichnung nach links gegen denValve spring 40, the valve ball 38 in the drawing to the left against the
Dichtsitz 68 gedrückt. Das Auslassventil 32 ist also geschlossen. Sealing seat 68 pressed. The exhaust valve 32 is thus closed.
Wenn dagegen der Kraftstoffdruck in dem Bereich der Öffnung 34 größer ist als der Kraftstoffdruck in dem Bereich der Ausnehmung 62 plus der Kraft der Ventilfeder 40, so kann die Ventilkugel 38 von dem Dichtsitz 68 in der Zeichnung nach rechts abheben. Das Auslassventil 32 ist also geöffnet. In contrast, if the fuel pressure in the region of the opening 34 is greater than the fuel pressure in the region of the recess 62 plus the force of the valve spring 40, the valve ball 38 can lift off from the sealing seat 68 in the drawing to the right. The exhaust valve 32 is thus open.
Sofern der Kraftstoffdruck in dem Bereich der Öffnung 34 genügend groß ist, kann die Ventilkugel 38 in der Zeichnung nach rechts maximal bis an den Anschlagabschnitt 66 gedrückt werden. Es ergibt sich somit eine If the fuel pressure in the region of the opening 34 is sufficiently large, the valve ball 38 can be pressed in the drawing to the right as far as the stop portion 66. This results in a
"Wegbegrenzung" für die Ventilkugel 38. Ein gestrichelt dargestellter Kreis 80 deutet die Position der Ventilkugel 38 in diesem Extremfall an. Man erkennt, dass der Ventilkörper 58 und der Anschlagkörper 60 eine radiale Führung der Ventilkugel 38 ermöglichen, vergleiche auch die nachfolgenden Figuren 3 und 4.  "Wegbegrenzung" for the valve ball 38. A dashed line 80 indicates the position of the valve ball 38 in this extreme case. It can be seen that the valve body 58 and the stopper body 60 allow a radial guidance of the valve ball 38, see also the following FIGS. 3 and 4.
Ein Pfeil 82 veranschaulicht eine sich ergebende Strömung des Kraftstoffs wenn das Auslassventil 32 geöffnet ist. Die Strömung erfolgt in der Zeichnung von links nach rechts durch die Öffnung 34, danach an der Ventilkugel 38 vorbei, danach teilweise zunächst durch die Öffnungen 75 nach radial außen und teilweise unmittelbar durch die ersten Strömungswege 74 in dem Ventilkörper 58, danach durch die zweiten Strömungswege 78 in dem Anschlagkörper 60, danach in die Hochdruckleitung 28 und hin zu dem nicht dargestellten Hochdruckspeicher. Insbesondere wird mittels der an dem Ventilkörper 58 ausgebildeten frei abragenden Stege 72 ein besonders großer hydraulischer Querschnitt bei geöffnetem Auslassventil 32 ermöglicht. An arrow 82 illustrates a resulting flow of the fuel when the exhaust valve 32 is opened. The flow takes place in the drawing from left to right through the opening 34, then past the valve ball 38, then partially first through the openings 75 radially outwardly and partially directly through the first flow paths 74 in the valve body 58, then through the second flow paths 78 in the stopper body 60, then in the High-pressure line 28 and to the high-pressure accumulator, not shown. In particular, by means of the free-projecting webs 72 formed on the valve body 58, a particularly large hydraulic cross-section is made possible with the outlet valve 32 open.
Figur 3 zeigt eine perspektivische Darstellung des Auslassventils 32. Figur 4 zeigt eine zu der Figur 3 ähnliche Ansicht des Ventilkörpers 58 allein. Man erkennt, dass der Ventilkörper 58 in einem Bereich des Führungsabschnitts 70 radialsymmetrisch ausgeführt ist und vorliegend drei axial abragende Stege 72 und entsprechend drei erste Strömungswege 74 und drei Öffnungen 75 umfasst.FIG. 3 shows a perspective view of the outlet valve 32. FIG. 4 shows a view, similar to FIG. 3, of the valve body 58 alone. It can be seen that the valve body 58 is radially symmetrical in a region of the guide section 70 and in the present case comprises three axially projecting webs 72 and correspondingly three first flow paths 74 and three openings 75.
In der Figur 4 ist gut zu erkennen, dass die Stege 72 einen kreisringsektorartigen Querschnitt aufweisen. In the figure 4 can be clearly seen that the webs 72 have a circular sector-like cross-section.
Abweichend von der in der Figur 2 gezeigten Ausführungsform ist bei den Figuren 3 und 4 zu erkennen, dass der Ventilkörper 58 im Bereich des Notwithstanding the embodiment shown in Figure 2 can be seen in Figures 3 and 4 that the valve body 58 in the region of
Führungsabschnitts 70 einen kleineren Außendurchmesser aufweist als im Bereich des den Dichtsitz 68 umfassenden Dichtabschnitts. Dadurch können die Stege 72 auch radial außen von Kraftstoff umströmt werden, wodurch sich bei geöffnetem Auslassventil 32 ein verbesserter hydraulischer Querschnitt ergeben kann. Außerdem kann der Führungsabschnitt 70 wegen des kleineren  Guide portion 70 has a smaller outer diameter than in the region of the sealing seat 68 comprehensive sealing portion. As a result, the webs 72 can also be flowed around radially on the outside of the fuel, whereby an improved hydraulic cross-section can result when the outlet valve 32 is open. In addition, the guide portion 70 can because of the smaller
Außendurchmessers von einem radial äußeren Bereich des Ventilkörpers 58, an welchem der Ventilkörper 58 in dem Gehäuse 12 angeordnet - insbesondere eingepresst - ist, entkoppelt werden. Der Anschlagkörper 60 ist ebenfalls in einem Bereich der Ausnehmungen 76 radialsymmetrisch ausgeführt und umfasst vorliegend fünf zweite Strömungswege 78, wobei aus Gründen der  Outer diameter of a radially outer region of the valve body 58, on which the valve body 58 arranged in the housing 12 - in particular pressed - is decoupled. The stopper body 60 is likewise designed to be radially symmetrical in a region of the recesses 76 and, in the present case, comprises five second flow paths 78, wherein, for reasons of
Übersichtlichkeit nur einer mit einem Bezugszeichen versehen ist.  Clarity only one is provided with a reference numeral.
Zum ersten sind die Querschnittsflächen der zweiten Strömungswege 78 derart gewählt, dass unabhängig von der radialen Ausrichtung des Anschlagkörpers 60 relativ zu dem Ventilkörper 58 mindestens einer der zweiten Strömungswege 78 einen der ersten Strömungswege 74 wenigstens teilweise überlappt. Zum zweiten ergibt sich dadurch, dass die erste Mehrzahl und die zweite Mehrzahl unterschiedlich sind, sozusagen eine radiale "Interferenz" zwischen den drei ersten und den fünf zweiten Strömungswegen 74 und 78. Dadurch ist ein in der Summe sich ergebender hydraulischer Öffnungsquerschnitt des Auslassventils 32 im Wesentlichen unabhängig von einem zufälligen radialen Montagewinkel zwischen dem Führungsabschnitt 70 und dem Anschlagkörper 60. First, the cross-sectional areas of the second flow paths 78 are selected such that, regardless of the radial orientation of the stop body 60 relative to the valve body 58, at least one of the second flow paths 78 at least partially overlaps one of the first flow paths 74. Secondly, because the first plurality and the second plurality are different, so to speak, there is a radial "interference" between the first three and the five second flow paths 74 and 78. This results in a total resulting hydraulic opening cross-section of the exhaust valve 32 is substantially independent of a random radial mounting angle between the guide portion 70 and the stopper body 60.

Claims

Ansprüche claims
1. Kraftstoff-Hochdruckpumpe (10), mit einem Auslassventil (32) mit einer A high-pressure fuel pump (10) having an outlet valve (32) with a
Ventilkugel (38) und einem Ventilkörper (58), der einen Dichtabschnitt aufweist, an dem ein Dichtsitz (68) vorhanden ist, und der einen  Valve ball (38) and a valve body (58) having a sealing portion on which a sealing seat (68) is present, and the one
Führungsabschnitt (70) aufweist, in dem die Ventilkugel (38) geführt ist, dadurch gekennzeichnet, dass der Führungsabschnitt (70) eine erste Mehrzahl von axial abragenden Stegen (72) umfasst, zwischen denen erste Strömungswege (74) gebildet sind, wobei mindestens zwischen zwei benachbarten der Stege (72) eine Öffnung (75) nach radial außen vorhanden ist.  Guide portion (70), in which the valve ball (38) is guided, characterized in that the guide portion (70) comprises a first plurality of axially projecting webs (72), between which first flow paths (74) are formed, wherein at least between two adjacent of the webs (72) an opening (75) is present radially outward.
2. Kraftstoff- Hochdruckpumpe (10) nach Anspruch 1 , dadurch gekennzeichnet, dass die Stege (72) als vom Dichtabschnitt frei abragende Stege (72) ausgebildet sind. 2. High-pressure fuel pump (10) according to claim 1, characterized in that the webs (72) are designed as free from the sealing portion projecting webs (72).
3. Kraftstoff- Hochdruckpumpe (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Stege (72) einen kreisringsektorartigen Querschnitt aufweisen. 3. high-pressure fuel pump (10) according to any one of the preceding claims, characterized in that the webs (72) have a circular-sector-like cross-section.
4. Kraftstoff-Hochdruckpumpe (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ventilkörper (58) im Bereich des 4. High-pressure fuel pump (10) according to one of the preceding claims, characterized in that the valve body (58) in the region of
Führungsabschnitts (70) einen kleineren Außendurchmesser aufweist als im Bereich des Dichtabschnitts.  Guide portion (70) has a smaller outer diameter than in the region of the sealing portion.
5. Kraftstoff- Hochdruckpumpe (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Auslassventil (32) einen Anschlagkörper (60) für die Ventilkugel (38) mit einem Anschlagabschnitt (66) aufweist, der den Öffnungshub der Ventilkugel (38) begrenzt, wobei der Anschlagkörper (60) eine zweite Mehrzahl von radialen Ausnehmungen (76) aufweist, die in Umfangsrichtung gleichmäßig verteilt angeordnet sind und zweite 5. high-pressure fuel pump (10) according to any one of the preceding claims, characterized in that the outlet valve (32) has a stop body (60) for the valve ball (38) having a stop portion (66), the opening stroke of the valve ball (38) limited, wherein the stopper body (60) has a second plurality of radial recesses (76) which are arranged distributed uniformly in the circumferential direction and second
Strömungswege (78) bilden, wobei die Querschnittsflächen und/oder die zweite Mehrzahl der zweiten Strömungswege (78) derart gewählt sind, dass unabhängig von der radialen Ausrichtung des Anschlagkörpers (60) mindestens ein zweiter Strömungsweg (78) einen ersten Strömungsweg (74) wenigstens teilweise überlappt. Forming flow paths (78), wherein the cross-sectional areas and / or the second plurality of the second flow paths (78) are selected such that, regardless of the radial orientation of the stop body (60), at least one second flow path (78) at least partially overlaps a first flow path (74).
6. Kraftstoff-Hochdruckpumpe (10) nach Anspruch 5, dadurch gekennzeichnet, dass sich eine Ventilfeder (40) an dem Anschlagkörper (60) abstützt. 6. High-pressure fuel pump (10) according to claim 5, characterized in that a valve spring (40) on the stop body (60) is supported.
7. Kraftstoff-Hochdruckpumpe (10) nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ventilfeder (40) als 7. High-pressure fuel pump (10) according to at least one of the preceding claims, characterized in that the valve spring (40) as
Schraubenfeder ausgeführt ist und in einer axialen Richtung verschiedene Durchmesser aufweist, insbesondere tailliert ist.  Coil spring is executed and in an axial direction has different diameters, in particular is waisted.
8. Kraftstoff-Hochdruckpumpe (10) nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anschlagkörper (60) und/oder der Ventilkörper (58) nach einem Verfahren des Metall- Pulverspritzgießens, MIM, hergestellt sind. 8. High-pressure fuel pump (10) according to at least one of the preceding claims, characterized in that the stop body (60) and / or the valve body (58) are produced by a method of metal powder injection molding, MIM.
9. Kraftstoff-Hochdruckpumpe (10) nach wenigstens einem der Ansprüche 5-8, dadurch gekennzeichnet, dass die erste Mehrzahl und die zweite Mehrzahl unterschiedlich sind. 9. High-pressure fuel pump (10) according to at least one of claims 5-8, characterized in that the first plurality and the second plurality are different.
10. Kraftstoff-Hochdruckpumpe (10) nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Anschlagkörper (60) als Stanzteil und/oder Tiefziehteil ausgeführt ist. 10. High-pressure fuel pump (10) according to at least one of the preceding claims, characterized in that the stop body (60) is designed as a stamped part and / or deep-drawn part.
EP15706759.6A 2014-04-15 2015-02-20 High-pressure fuel pump comprising a discharge valve with a valve ball and a valve body Active EP3152434B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014207194.1A DE102014207194A1 (en) 2014-04-15 2014-04-15 High-pressure fuel pump, with an outlet valve with a valve ball and a valve body
PCT/EP2015/053562 WO2015158451A1 (en) 2014-04-15 2015-02-20 High-pressure fuel pump comprising a discharge valve with a valve ball and a valve body

Publications (2)

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EP3152434A1 true EP3152434A1 (en) 2017-04-12
EP3152434B1 EP3152434B1 (en) 2019-10-16

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EP15706759.6A Active EP3152434B1 (en) 2014-04-15 2015-02-20 High-pressure fuel pump comprising a discharge valve with a valve ball and a valve body

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US (1) US10167834B2 (en)
EP (1) EP3152434B1 (en)
DE (1) DE102014207194A1 (en)
WO (1) WO2015158451A1 (en)

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Also Published As

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WO2015158451A1 (en) 2015-10-22
EP3152434B1 (en) 2019-10-16
US10167834B2 (en) 2019-01-01
US20170159629A1 (en) 2017-06-08
DE102014207194A1 (en) 2015-10-15

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