EP2867529A1 - Piston fuel pump - Google Patents

Piston fuel pump

Info

Publication number
EP2867529A1
EP2867529A1 EP13729946.7A EP13729946A EP2867529A1 EP 2867529 A1 EP2867529 A1 EP 2867529A1 EP 13729946 A EP13729946 A EP 13729946A EP 2867529 A1 EP2867529 A1 EP 2867529A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel pump
guide element
guide
piston fuel
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
EP13729946.7A
Other languages
German (de)
French (fr)
Other versions
EP2867529B1 (en
Inventor
Michael Kleindl
Tamim Latif
Peter Ropertz
Matthias Maess
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 EP2867529A1 publication Critical patent/EP2867529A1/en
Application granted granted Critical
Publication of EP2867529B1 publication Critical patent/EP2867529B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2064—Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2035—Cylinder barrels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2042—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/1007—Ball valves having means for guiding the closure member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/101—Ball valves having means for limiting the opening height
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially
    • F04B53/1025—Disc valves having means for guiding the closure member axially the guiding means being provided within the valve opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1022—Disc valves having means for guiding the closure member axially
    • F04B53/1027—Disc valves having means for guiding the closure member axially the guiding means being provided at both sides of the disc
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1035—Disc valves with means for limiting the opening height
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1037—Flap valves
    • F04B53/104—Flap valves the closure member being a rigid element oscillating around a fixed point
    • F04B53/1045—Flap valves the closure member being a rigid element oscillating around a fixed point the valve being formed by two elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1037—Flap valves
    • F04B53/1047—Flap valves the valve being formed by one or more flexible elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1037—Flap valves
    • F04B53/1047—Flap valves the valve being formed by one or more flexible elements
    • F04B53/106—Flap valves the valve being formed by one or more flexible elements the valve being a membrane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1037—Flap valves
    • F04B53/1047—Flap valves the valve being formed by one or more flexible elements
    • F04B53/106—Flap valves the valve being formed by one or more flexible elements the valve being a membrane
    • F04B53/1067—Flap valves the valve being formed by one or more flexible elements the valve being a membrane fixed at its whole periphery and with an opening at its centre
    • F04B53/107—Flap valves the valve being formed by one or more flexible elements the valve being a membrane fixed at its whole periphery and with an opening at its centre the opening normally being closed by a fixed element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1085—Valves; Arrangement of valves having means for limiting the opening height
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1087—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible

Definitions

  • the invention relates to a piston fuel pump according to the preamble of
  • Claim 1 From the market known fuel systems of internal combustion engines, in which the fuel is conveyed from a fuel tank by means of a mechanically driven piston fuel pump under high pressure in a fuel rail.
  • the piston fuel pump has at least one inlet valve and one outlet valve.
  • the outlet valve is designed as a spring-loaded check valve, usually with a spherical valve element.
  • the fuel piston pump according to the invention has the advantage that its manufacture can be simplified and thus the production costs can be reduced because the guide element is securely held in the pump housing without additional joining measures.
  • the guide member By the guide member, the reliability in the operation of the piston fuel pump is further increased, since a tilting prevented and tight closing are ensured.
  • the guidance of the valve member by the guide member also reduces wear.
  • the guidance of the valve element also ensures a temporally shortened closing process, which increases the efficiency of the piston fuel pump.
  • a first development is characterized in that the guide element has a guide section for guiding the valve element and a mounting section for mounting in the opening of the pump housing, wherein the guide section and the mounting section are arranged axially at different points of the guide element.
  • the function "guide” is thus separated spatially by the function "holder". As a result, the quality of the function "guide” is maintained, even if in the "bracket" due to the radial pressing radial
  • the guide element is pressed into a retaining ring, which in turn is pressed into the pump housing, wherein the retaining ring preferably has fuel passage openings.
  • the latter can be designed as axially extending channels or as intermediate spaces between radially outwardly extending wing or blade-like fastening sections.
  • the guide element can thus be very easily constructed, which is his
  • the guide element has a stroke stop, which limits the opening stroke of the valve element to a predetermined extent.
  • This has the advantage that the closing momentum of the valve element is reduced to the valve seat by the travel of the valve element is reduced by the stroke stop.
  • the existing accelerations therefore only act on a limited path, which leads to a lower closing speed of the valve element. This reduces the damaging effects of closing, in particular the wear caused by the closing impact both on the valve element and on the valve seat.
  • the reduced flight path ensures a shorter time
  • Closing process which increases the efficiency of the piston fuel pump.
  • the lower closing speed leads to a lower
  • a further advantageous development of the piston fuel pump according to the invention is characterized in that the guide element is arranged coaxially to and radially outside of the valve element and has a radially inwardly directed shoulder, which forms the stroke stop.
  • the radially inwardly directed stroke stop may be formed for example by an annular shoulder, where the valve element largely comes into contact surface, whereby the loads on the valve element are kept low. In addition, such a guide element does not hinder the placement of the valve spring.
  • the guide element at least partially has a smaller inner diameter than the valve element and is arranged coaxially with the valve element, and that the valve element towards the end of the guide portion forms the stroke stop, or that it has a radially outwardly directed paragraph that makes the stroke stop. Again, this is easy to manufacture and assemble and also has the advantage of smaller radial dimensions.
  • the guide element fulfills not one, but two or possibly even three tasks.
  • This integration of different functions in said guide element can be further expanded if it has a support portion on which the end of the valve spring opposite the valve element is supported.
  • valve spring is a spiral or star-shaped flat diaphragm spring, which is attached to the guide element or directly to the pump housing. As a result, the axial height of the exhaust valve can be reduced.
  • the guide element may be a sintered or an MIM part. Such a part has a considerable mechanical robustness and thus only in the long term very little wear. Finally, it is also proposed that the valve element has pot-shaped shape.
  • the circumferential wall of such a valve element is particularly well suited as a guide wall in interaction with the above-mentioned guide element.
  • valve element has a comparatively low mass and thus good dynamics, which in turn benefits the efficiency of the piston fuel pump according to the invention.
  • Figure 1 is a schematic representation of a fuel system of a
  • FIG. 1 Internal combustion engine with a piston fuel pump, which in turn has an exhaust valve;
  • Figure 2 is a longitudinal section through a first embodiment of the exhaust valve of Figure 1;
  • Figure 3 is a longitudinal section through a second embodiment of the exhaust valve of Figure 1;
  • Figure 4 is a longitudinal section through a third embodiment of the exhaust valve of Figure 1;
  • Figure 5 is a plan view of the outlet valve of Figure 4.
  • Figure 6 is a longitudinal section through a fourth embodiment of the exhaust valve of Figure 1;
  • Figure 7 is a plan view of the outlet valve of Figure 6;
  • Figure 8 is a longitudinal section through a fifth embodiment of the exhaust valve of Figure 1;
  • Figure 9 is a plan view of the outlet valve of Figure 8;
  • Figure 10 is a longitudinal section through a sixth embodiment of the exhaust valve of Figure 1;
  • FIG. 11 is a top view of the outlet valve of FIG. 10.
  • a fuel system of an internal combustion engine carries in FIG. 1 the whole
  • Reference numeral 10 It comprises a fuel tank 12, from which an electric prefeed pump 14 conveys the fuel into a low-pressure line 16. This leads to a high-pressure pump in the form of a piston fuel pump 18 indicated by a dot-dash line. From this, a high-pressure line 20 leads to a fuel rail 22. A plurality of injectors 24 are connected to the latter
  • the piston fuel pump 18 includes only indicated in regions
  • Pump housing 26 in which a pump piston 28 is guided. This can be offset by a drive, not shown, in a reciprocating motion, which is indicated by a double arrow 30.
  • the pump piston 28 and the pump housing 26 define a delivery chamber 32. This is connected via an inlet valve 34 to the low pressure line 16. Furthermore, the delivery chamber 32 via a
  • High-pressure passage 36 is connected to an outlet valve 38, which in turn is connected to the high-pressure line 20 on the outlet side.
  • Both the inlet valve 34 and the outlet valve 38 are designed as spring-loaded check valves.
  • the intake valve 34 may be forcibly opened during a delivery stroke of the pump piston 28, so that the fuel is not in the fuel rail 22, but back into the
  • Low pressure line 16 is promoted. As a result, the amount of fuel delivered by the piston fuel pump 18 into the fuel rail 22 can be adjusted.
  • FIG. 2 shows a first embodiment of the outlet valve 38 in section.
  • an annular counter-plate 40 is press-fitted in the pump housing 26 stepped opening 41, wherein the counter-plate 40 on its right in Figure 2 front end has an axially extending collar-like portion which forms a valve seat 42. This cooperates with a cup-shaped valve element 44.
  • the counter-plate 40 is annular with an inner channel 43.
  • the cup-shaped valve member 44 includes a bottom 46 and a circumferential
  • the outlet valve 38 further comprises a cylindrical guide element in the form of a presently stepped sleeve 50. This has a left in Figure 2 first portion 52 ("guide portion”) and a right in Figure 2 second portion 54th
  • the first portion 52 has a larger diameter than the second portion 54. Both portions 52 and 54 are interconnected by a radially extending connecting portion 56.
  • the guide element 50 is presently produced as a sheet metal part by deep drawing.
  • the inner diameter of the first portion 52 is slightly larger than the outer diameter of the
  • valve member 44 is slidably movable in the first portion 52 of the guide member 50 in the axial direction, but firmly guided in the radial direction. In a direction away from the valve seat 42, the end face of the valve element 44 forms the end face
  • the guide member 50 has a radially inwardly directed web 60, whose inner edge defines an opening 62. Between the web 60 of the guide member 50 and the valve element 44, a helical valve spring 64 is clamped. The inwardly directed web 60 forms in this respect a support portion for the valve element 44 opposite end of the valve spring 64. The outer diameter of the valve spring 64 and the
  • the outlet valve 38 further comprises a retaining ring 66 which is pressed with its outer wall 68 into the opening 41 in the pump housing 26.
  • the second portion 54 of the guide member 50 is pressed.
  • the connecting portion 56 rests with its side pointing to the right in FIG. 2 on the side of the retaining ring 66 pointing to the left in FIG.
  • the guide element 50 can be compressed so far with very little pressure in the retaining ring 66, possibly even be used loosely in the retaining ring 66, without this would affect the operability of the exhaust valve 38.
  • a plurality of channel-like fuel passage openings 71 are present.
  • valve element 44 lifts off from the valve seat 42 when the pressure in the delivery chamber 32 reaches a corresponding opening value during a delivery stroke of the pump piston 28.
  • stroke of the valve element 44 is limited by the stroke stop 58 to a predetermined amount H, which is the distance between the stroke stop 58 and the projecting edge of the
  • the guide member 50 is made as a sintered or MIM part. Radially outward, the guide element 50 has a constant diameter. Inside, it has a first annular shoulder, which forms the stroke stop 58, and a second shoulder, which forms the support portion 60 for the valve spring 64.
  • the guide member 50 is compressed by itself radially outwardly extending wing or fin sections 72 in the pump housing 26, between which
  • valve member 44 is not pot-shaped but mushroom-shaped with a valve plate 46 and a "stem" 48.
  • cylindrical guide member 50 has a smaller inner diameter than the valve member 44 but is coaxial with the valve member as before 44 arranged. The end of the guide element 50 pointing toward the valve element 44 forms the stroke stop 58.
  • the guide element 50 is held in the pump housing 26 by means of a plurality of radially projecting vanes 72, between which passage openings 71 for the fuel are present.
  • the valve spring 64 is a flat diaphragm spring secured to the top of the guide member 50.
  • the flat diaphragm spring 64 is executed with a spiral inwardly wound spring arm 74 at the end of the stem 48 of the valve member 44 abuts ( Figures 6 and 7), or in the end of the smaller diameter end of the stem 48 of the Valve element 44 is fitted ( Figures 4 and 5).
  • the flat diaphragm spring 64 is formed like a rosette with a plurality of radial star-shaped spring arms 74 which are held in a center 76 against which abuts the end of the stem 48 of the valve member 44.
  • the flat diaphragm spring 64 of FIGS. 10 and 11 also has an intermediate ring 78.

Landscapes

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

Abstract

A piston fuel pump for an internal combustion engine comprises a pump housing (26), a piston and a non-return discharge valve (38) having a valve element (44) and a guide element (50) for guiding the movement of the valve element (44). According to the invention, the guide element (50) is at least indirectly pressed in a radial manner into an opening (41) in the pump housing (26).

Description

Beschreibung Titel  Description title
Kolben-Kraftstoffpumpe Stand der Technik  Piston fuel pump prior art
Die Erfindung betrifft eine Kolben-Kraftstoffpumpe nach dem Oberbegriff des The invention relates to a piston fuel pump according to the preamble of
Anspruchs 1. Vom Markt bekannt sind Kraftstoffsysteme von Brennkraftmaschinen, bei denen der Kraftstoff aus einem Kraftstofftank mittels einer mechanisch angetriebenen Kolben- Kraftstoffpumpe unter hohem Druck in ein Kraftstoffrail gefördert wird. Hierzu verfügt die Kolben-Kraftstoffpumpe über mindestens ein Einlassventil und ein Auslassventil. Das Auslassventil ist als federbeaufschlagtes Rückschlagventil ausgeführt, meist mit einem kugelförmigen Ventilelement. Claim 1. From the market known fuel systems of internal combustion engines, in which the fuel is conveyed from a fuel tank by means of a mechanically driven piston fuel pump under high pressure in a fuel rail. For this purpose, the piston fuel pump has at least one inlet valve and one outlet valve. The outlet valve is designed as a spring-loaded check valve, usually with a spherical valve element.
Offenbarung der Erfindung Disclosure of the invention
Das der vorliegenden Erfindung zu Grunde liegende Problem wird durch eine The problem underlying the present invention is achieved by a
Kraftstoff-Kolbenpumpe mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen genannt. Weitere für die Erfindung wichtige Merkmale finden sich darüber hinaus in der nachfolgenden Beschreibung und in der Zeichnung. Die erfindungsgemäße Kraftstoff-Kolbenpumpe hat den Vorteil, dass ihre Herstellung vereinfacht und hierdurch die Herstellkosten gesenkt werden können, weil das Führungselement ohne zusätzliche Fügemaßnahmen sicher im Pumpengehäuse gehalten wird. Durch das Führungselement wird ferner die Zuverlässigkeit im Betrieb der Kolben-Kraftstoffpumpe erhöht, da ein Verkanten verhindert und dichtes Schließen gewährleistet werden. Die Führung des Ventilelements durch das Führungselement verringert außerdem den Verschleiß. Die Führung des Ventilelements sorgt auch für einen zeitlich verkürzten Schließvorgang, was den Wirkungsgrad der Kolben- Kraftstoffpumpe erhöht. Fuel-piston pump solved with the features of claim 1. Advantageous developments of the invention are mentioned in subclaims. Further important for the invention features are also found in the following description and in the drawing. The fuel piston pump according to the invention has the advantage that its manufacture can be simplified and thus the production costs can be reduced because the guide element is securely held in the pump housing without additional joining measures. By the guide member, the reliability in the operation of the piston fuel pump is further increased, since a tilting prevented and tight closing are ensured. The guidance of the valve member by the guide member also reduces wear. The guidance of the valve element also ensures a temporally shortened closing process, which increases the efficiency of the piston fuel pump.
Eine erste Weiterbildung zeichnet sich dadurch aus, dass das Führungselement einen Führungsabschnitt zur Führung des Ventilelements und einen Halterungsabschnitt zur Halterung in der Öffnung des Pumpengehäuses aufweist, wobei der Führungsabschnitt und der Halterungsabschnitt axial an unterschiedlichen Stellen des Führungselements angeordnet sind. Die Funktion "Führung" wird somit von der Funktion "Halterung" räumlich getrennt. Hierdurch bleibt die Qualität der Funktion "Führung" erhalten, auch wenn im Bereich "Halterung" auf Grund des radialen Einpressens radiale A first development is characterized in that the guide element has a guide section for guiding the valve element and a mounting section for mounting in the opening of the pump housing, wherein the guide section and the mounting section are arranged axially at different points of the guide element. The function "guide" is thus separated spatially by the function "holder". As a result, the quality of the function "guide" is maintained, even if in the "bracket" due to the radial pressing radial
Verformungen entstehen. Deformations occur.
In Weiterbildung hierzu wird vorgeschlagen, dass das Führungselement in einen Haltering eingepresst ist, der wiederum in das Pumpengehäuse eingepresst ist, wobei der Haltering vorzugsweise Kraftstoff-Durchlassöffnungen aufweist. Letztere können als axial verlaufende Kanäle oder als Zwischenräume zwischen sich nach radial außen erstreckenden flügel- oder lamellenartigen Befestigungsabschnitten ausgebildet sein. Das Führungselement kann somit sehr einfach aufgebaut werden, was seine In a further development, it is proposed that the guide element is pressed into a retaining ring, which in turn is pressed into the pump housing, wherein the retaining ring preferably has fuel passage openings. The latter can be designed as axially extending channels or as intermediate spaces between radially outwardly extending wing or blade-like fastening sections. The guide element can thus be very easily constructed, which is his
Herstellkosten senkt, da die Kraftstoffdurchleitungsfunktion von dem separaten Haltering wahrgenommen wird. Lowers manufacturing costs, as the fuel passage function is perceived by the separate retaining ring.
Vorgeschlagen wird auch, dass das Führungselement einen Hubanschlag aufweist, welcher den Öffnungshub des Ventilelements auf ein vorgegebenes Maß begrenzt. Dies hat den Vorteil, dass der Schließimpuls des Ventilelements auf den Ventilsitz reduziert wird, indem der Flugweg des Ventilelements durch den Hubanschlag verringert wird. Die vorhandenen Beschleunigungen wirken daher nur noch auf einem begrenzten Weg, was zu einer geringeren Schließgeschwindigkeit des Ventilelements führt. Dies verringert die schädigenden Wirkungen beim Schließen, insbesondere den durch den Schließaufprall sowohl am Ventilelement als auch am Ventilsitz erzeugten Verschleiß. Außerdem sorgt der reduzierte Flugweg für einen zeitlich verkürztenIt is also proposed that the guide element has a stroke stop, which limits the opening stroke of the valve element to a predetermined extent. This has the advantage that the closing momentum of the valve element is reduced to the valve seat by the travel of the valve element is reduced by the stroke stop. The existing accelerations therefore only act on a limited path, which leads to a lower closing speed of the valve element. This reduces the damaging effects of closing, in particular the wear caused by the closing impact both on the valve element and on the valve seat. In addition, the reduced flight path ensures a shorter time
Schließvorgang, was den Wirkungsgrad der Kolben-Kraftstoffpumpe erhöht. Darüber hinaus führt die geringere Schließgeschwindigkeit zu einer geringeren Closing process, which increases the efficiency of the piston fuel pump. In addition, the lower closing speed leads to a lower
Aufprallgeschwindigkeit des Ventilelements am Ventilsitz, was zu einer Impact velocity of the valve element on the valve seat, resulting in a
Geräuschverminderung im Betrieb der Kolben-Kraftstoffpumpe führt. Eine weitere vorteilhafte Weiterbildung der erfindungsgemäßen Kolben- Kraftstoffpumpe zeichnet sich dadurch aus, dass das Führungselement koaxial zum und radial außerhalb vom Ventilelement angeordnet ist und einen nach radial einwärts gerichteten Absatz aufweist, der den Hubanschlag bildet. Ein solches Noise reduction during operation of the piston fuel pump leads. A further advantageous development of the piston fuel pump according to the invention is characterized in that the guide element is arranged coaxially to and radially outside of the valve element and has a radially inwardly directed shoulder, which forms the stroke stop. Such
Führungselement ist einfach herzustellen, und der nach radial einwärts gerichtete Hubanschlag kann beispielsweise durch einen ringförmigen Absatz ausgebildet sein, an dem das Ventilelement weitestgehend flächig in Anlage kommt, wodurch die Belastungen auf das Ventilelement gering gehalten werden. Darüber hinaus behindert ein solches Führungselement die Unterbringung der Ventilfeder nicht. Guide element is easy to manufacture, and the radially inwardly directed stroke stop may be formed for example by an annular shoulder, where the valve element largely comes into contact surface, whereby the loads on the valve element are kept low. In addition, such a guide element does not hinder the placement of the valve spring.
Alternativ hierzu ist es auch möglich, dass das Führungselement mindestens abschnittsweise einen kleineren Innendurchmesser als das Ventilelement aufweist und koaxial zum Ventilelement angeordnet ist, und dass das zum Ventilelement hin weisende Ende des Führungsabschnitts den Hubanschlag bildet, oder dass es einen nach radial auswärts gerichteten Absatz aufweist, der den Hubanschlag bildet. Auch dies ist einfach zu fertigen und zu montieren und hat darüber hinaus noch den Vorteil der geringeren radialen Abmessungen. Alternatively, it is also possible that the guide element at least partially has a smaller inner diameter than the valve element and is arranged coaxially with the valve element, and that the valve element towards the end of the guide portion forms the stroke stop, or that it has a radially outwardly directed paragraph that makes the stroke stop. Again, this is easy to manufacture and assemble and also has the advantage of smaller radial dimensions.
Dabei ist es besonders vorteilhaft, wenn auch eine Ventilfeder durch das It is particularly advantageous if a valve spring through the
Führungselement geführt wird. Damit erfüllt das Führungselement nicht nur eine, sondern zwei oder gegebenenfalls sogar drei Aufgaben. Durch die Integration der verschiedenen Funktionen werden Bauteile und somit Fertigungs- und Montagekosten gespart. Diese Integration unterschiedlicher Funktionen in das besagte Führungselement kann nochmals erweitert werden, wenn es einen Stützabschnitt aufweist, an dem sich das vom Ventilelement entgegengesetzte Ende der Ventilfeder abstützt. Guiding element is guided. Thus, the guide element fulfills not one, but two or possibly even three tasks. By integrating the various functions, components and thus manufacturing and assembly costs are saved. This integration of different functions in said guide element can be further expanded if it has a support portion on which the end of the valve spring opposite the valve element is supported.
Ferner wird vorgeschlagen, dass die Ventilfeder eine spiralig oder sternartig geformte Flachmembranfeder ist, die an dem Führungselement oder direkt am Pumpengehäuse befestigt ist. Hierdurch kann die axial Bauhöhe des Auslassventils reduziert werden. It is also proposed that the valve spring is a spiral or star-shaped flat diaphragm spring, which is attached to the guide element or directly to the pump housing. As a result, the axial height of the exhaust valve can be reduced.
Bei dem Führungselement kann es sich um ein Sinter- oder ein MIM-Teil handeln. Ein derartiges Teil hat eine erhebliche mechanische Robustheit und somit einen auch auf Dauer nur sehr geringen Verschleiß. Schließlich wird auch noch vorgeschlagen, dass das Ventilelement topfformige Gestalt hat. Die umlaufende Wand eines solchen Ventilelements eignet sich besonders gut als Führungswand im Zusammenspiel mit dem oben erwähnten Führungselement. The guide element may be a sintered or an MIM part. Such a part has a considerable mechanical robustness and thus only in the long term very little wear. Finally, it is also proposed that the valve element has pot-shaped shape. The circumferential wall of such a valve element is particularly well suited as a guide wall in interaction with the above-mentioned guide element.
Dennoch hat ein solches Ventilelement eine vergleichsweise geringe Masse und somit eine gute Dynamik, was wiederum dem Wirkungsgrad der erfindungsgemäßen Kolben- Kraftstoffpumpe zu Gute kommt. Nevertheless, such a valve element has a comparatively low mass and thus good dynamics, which in turn benefits the efficiency of the piston fuel pump according to the invention.
Nachfolgend werden Beispiele der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung näher erläutert. In der Zeichnung zeigen: Hereinafter, examples of the present invention will be explained in detail with reference to the accompanying drawings. In the drawing show:
Figur 1 eine schematische Darstellung eines Kraftstoffsystems einer Figure 1 is a schematic representation of a fuel system of a
Brennkraftmaschine mit einer Kolben-Kraftstoffpumpe, die wiederum ein Auslassventil aufweist; Figur 2 einen Längsschnitt durch eine erste Ausführungsform des Auslassventils von Figur 1 ; Internal combustion engine with a piston fuel pump, which in turn has an exhaust valve; Figure 2 is a longitudinal section through a first embodiment of the exhaust valve of Figure 1;
Figur 3 einen Längsschnitt durch eine zweite Ausführungsform des Auslassventils von Figur 1 ; Figure 3 is a longitudinal section through a second embodiment of the exhaust valve of Figure 1;
Figur 4 einen Längsschnitt durch eine dritte Ausführungsform des Auslassventils von Figur 1 ; Figure 4 is a longitudinal section through a third embodiment of the exhaust valve of Figure 1;
Figur 5 einen Draufsicht auf das Auslassventil von Figur 4; Figure 5 is a plan view of the outlet valve of Figure 4;
Figur 6 einen Längsschnitt durch eine vierte Ausführungsform des Auslassventils von Figur 1 ; Figure 6 is a longitudinal section through a fourth embodiment of the exhaust valve of Figure 1;
Figur 7 einen Draufsicht auf das Auslassventil von Figur 6; Figure 7 is a plan view of the outlet valve of Figure 6;
Figur 8 einen Längsschnitt durch eine fünfte Ausführungsform des Auslassventils von Figur 1 ; Figure 8 is a longitudinal section through a fifth embodiment of the exhaust valve of Figure 1;
Figur 9 einen Draufsicht auf das Auslassventil von Figur 8; Figur 10 einen Längsschnitt durch eine sechste Ausführungsform des Auslassventils von Figur 1 ; und Figure 9 is a plan view of the outlet valve of Figure 8; Figure 10 is a longitudinal section through a sixth embodiment of the exhaust valve of Figure 1; and
Figur 1 1 einen Draufsicht auf das Auslassventil von Figur 10. FIG. 11 is a top view of the outlet valve of FIG. 10.
Ein Kraftstoffsystem einer Brennkraftmaschine trägt in Figur 1 insgesamt das A fuel system of an internal combustion engine carries in FIG. 1 the whole
Bezugszeichen 10. Es umfasst einen Kraftstoffbehälter 12, aus dem eine elektrische Vorförderpumpe 14 den Kraftstoff in eine Niederdruckleitung 16 fördert. Diese führt zu einer durch eine strichpunktierte Linie angedeuteten Hochdruckpumpe in Form einer Kolben-Kraftstoffpumpe 18. Von dieser führt eine Hochdruckleitung 20 zu einem Kraftstoffrail 22. An dieses sind mehrere Injektoren 24 angeschlossen, die den Reference numeral 10. It comprises a fuel tank 12, from which an electric prefeed pump 14 conveys the fuel into a low-pressure line 16. This leads to a high-pressure pump in the form of a piston fuel pump 18 indicated by a dot-dash line. From this, a high-pressure line 20 leads to a fuel rail 22. A plurality of injectors 24 are connected to the latter
Kraftstoff direkt in ihnen jeweils zugeordnete Brennräume (nicht dargestellt) einspritzen. Inject fuel directly into each associated combustion chambers (not shown).
Die Kolben-Kraftstoffpumpe 18 umfasst ein nur bereichsweise angedeutetes The piston fuel pump 18 includes only indicated in regions
Pumpengehäuse 26, in dem ein Pumpenkolben 28 geführt ist. Dieser kann von einem nicht dargestellten Antrieb in eine Hin- und Herbewegung versetzt werden, was durch einen Doppelpfeil 30 angedeutet ist. Der Pumpenkolben 28 und das Pumpengehäuse 26 begrenzen einen Förderraum 32. Dieser ist über ein Einlassventil 34 mit der Niederdruckleitung 16 verbunden. Ferner ist der Förderraum 32 über einen Pump housing 26 in which a pump piston 28 is guided. This can be offset by a drive, not shown, in a reciprocating motion, which is indicated by a double arrow 30. The pump piston 28 and the pump housing 26 define a delivery chamber 32. This is connected via an inlet valve 34 to the low pressure line 16. Furthermore, the delivery chamber 32 via a
Hochdruckkanal 36 mit einem Auslassventil 38 verbunden, welches auslassseitig wiederum mit der Hochdruckleitung 20 verbunden ist. Sowohl das Einlassventil 34 als auch das Auslassventil 38 sind als federbeaufschlagte Rückschlagventile ausgeführt. Nicht dargestellt, aber möglich ist dabei eine Ausführung des Einlassventils als Mengensteuerventil. Bei einem solchen kann das Einlassventil 34 während eines Förderhubs des Pumpenkolbens 28 zwangsweise geöffnet werden, so dass der Kraftstoff nicht in das Kraftstoffrail 22, sondern zurück in die High-pressure passage 36 is connected to an outlet valve 38, which in turn is connected to the high-pressure line 20 on the outlet side. Both the inlet valve 34 and the outlet valve 38 are designed as spring-loaded check valves. Not shown, but possible is an embodiment of the intake valve as a quantity control valve. In such, the intake valve 34 may be forcibly opened during a delivery stroke of the pump piston 28, so that the fuel is not in the fuel rail 22, but back into the
Niederdruckleitung 16 gefördert wird. Hierdurch kann die von der Kolben- Kraftstoffpumpe 18 in das Kraftstoffrail 22 geförderte Kraftstoffmenge eingestellt werden. Low pressure line 16 is promoted. As a result, the amount of fuel delivered by the piston fuel pump 18 into the fuel rail 22 can be adjusted.
Die Ausgestaltung des Auslassventils 38 ist vorliegend von besonderer Bedeutung. Auf dieses wird daher nunmehr unter Bezugnahme auf Figur 2 stärker im Detail eingegangen: Figur 2 zeigt eine erste Ausführungsform des Auslassventils 38 im Schnitt. In Figur 2 ganz links ist eine ringförmige Gegenplatte 40 in im Pumpengehäuse 26 vorhandene stufenförmige Öffnung 41 eingepresst, wobei die Gegenplatte 40 auf ihrer in Figur 2 rechten Stirnseite einen sich axial erstreckenden kragenartigen Abschnitt aufweist, der einen Ventilsitz 42 bildet. Dieser arbeitet mit einem topfförmigen Ventilelement 44 zusammen. Die Gegenplatte 40 ist ringförmig mit einem Innenkanal 43. Das topfförmige Ventilelement 44 umfasst einen Boden 46 und eine umlaufende The design of the outlet valve 38 is of particular importance in the present case. This will now be discussed in more detail with reference to Figure 2: FIG. 2 shows a first embodiment of the outlet valve 38 in section. In Figure 2 far left an annular counter-plate 40 is press-fitted in the pump housing 26 stepped opening 41, wherein the counter-plate 40 on its right in Figure 2 front end has an axially extending collar-like portion which forms a valve seat 42. This cooperates with a cup-shaped valve element 44. The counter-plate 40 is annular with an inner channel 43. The cup-shaped valve member 44 includes a bottom 46 and a circumferential
Führungswand 48. Die Öffnung 41 ist Teil des Hochdruckkanals 36. Guide wall 48. The opening 41 is part of the high pressure passage 36th
Das Auslassventil 38 umfasst ferner ein zylindrisches Führungselement in Form einer vorliegend stufigen Hülse 50. Dieses weist einen in Figur 2 linken ersten Abschnitt 52 ("Führungsabschnitt") und einen in Figur 2 rechten zweiten Abschnitt 54 The outlet valve 38 further comprises a cylindrical guide element in the form of a presently stepped sleeve 50. This has a left in Figure 2 first portion 52 ("guide portion") and a right in Figure 2 second portion 54th
("Halterungsabschnitt") auf. Der erste Abschnitt 52 hat einen größeren Durchmesser als der zweite Abschnitt 54. Beide Abschnitte 52 und 54 sind durch einen sich radial erstreckenden Verbindungsabschnitt 56 miteinander verbunden. Das Führungselement 50 ist vorliegend als Blechteil durch Tiefziehen hergestellt. Der Innendurchmesser des ersten Abschnitts 52 ist ganz leicht größer als der Außendurchmesser der ("Support section"). The first portion 52 has a larger diameter than the second portion 54. Both portions 52 and 54 are interconnected by a radially extending connecting portion 56. The guide element 50 is presently produced as a sheet metal part by deep drawing. The inner diameter of the first portion 52 is slightly larger than the outer diameter of the
Führungswand 48 des Ventilelements 44. Auf diese Weise ist das Ventilelement 44 gleitend im ersten Abschnitt 52 des Führungselements 50 in axialer Richtung beweglich, jedoch in radialer Richtung fest geführt. In einer Richtung vom Ventilsitz 42 weg bildet dabei die dem Ventilelement 44 zugewandte Stirnfläche des Guide wall 48 of the valve element 44. In this way, the valve member 44 is slidably movable in the first portion 52 of the guide member 50 in the axial direction, but firmly guided in the radial direction. In a direction away from the valve seat 42, the end face of the valve element 44 forms the end face
Verbindungsabschnitts 56 einen Hubanschlag 58 für das Ventilelement 44 Connecting portion 56 a stroke stop 58 for the valve element 44th
beziehungsweise den abragenden Rand von dessen Führungswand 48. or the projecting edge of the guide wall 48th
An ihrem in Figur 2 rechten Ende weist das Führungselement 50 einen nach radial einwärts gerichteten Steg 60 auf, dessen innerer Rand eine Öffnung 62 begrenzt. Zwischen dem Steg 60 des Führungselements 50 und dem Ventilelement 44 ist eine schraubenförmige Ventilfeder 64 verspannt. Der nach innen gerichtete Steg 60 bildet insoweit einen Stützabschnitt für das vom Ventilelement 44 entgegengesetzte Ende der Ventilfeder 64. Der Außendurchmesser der Ventilfeder 64 und der At its right in Figure 2 end, the guide member 50 has a radially inwardly directed web 60, whose inner edge defines an opening 62. Between the web 60 of the guide member 50 and the valve element 44, a helical valve spring 64 is clamped. The inwardly directed web 60 forms in this respect a support portion for the valve element 44 opposite end of the valve spring 64. The outer diameter of the valve spring 64 and the
Innendurchmesser des zweiten Abschnitts 54 des Führungselements 50 sind so aufeinander abgestimmt, dass die Ventilfeder 64 in dem zweiten Abschnitt 54 des Führungselements 50 radial geführt ist. Das Auslassventil 38 umfasst ferner einen Haltering 66, der mit seiner Außenwand 68 in die Öffnung 41 im Pumpengehäuse 26 eingepresst ist. In die Innenöffnung 70 des Halterings 66 ist wiederum der zweite Abschnitt 54 des Führungselements 50 eingepresst. Dabei liegt der Verbindungsabschnitt 56 mit seiner in Figur 2 nach rechts weisenden Seite an der in Figur 2 nach links weisenden Seite des Halterings 66 an. Das Führungselement 50 kann insoweit mit sehr geringer Pressung im Haltering 66 verpresst sein, gegebenenfalls auch einfach lose in den Haltering 66 eingesetzt sein, ohne dass dies die Funktionsfähigkeit des Auslassventils 38 beeinflussen würde. In dem Haltering 66 sind mehrere kanalartige Kraftstoffdurchlassöffnungen 71 vorhanden. Inner diameter of the second portion 54 of the guide member 50 are coordinated so that the valve spring 64 is radially guided in the second portion 54 of the guide member 50. The outlet valve 38 further comprises a retaining ring 66 which is pressed with its outer wall 68 into the opening 41 in the pump housing 26. In the inner opening 70 of the retaining ring 66, in turn, the second portion 54 of the guide member 50 is pressed. In this case, the connecting portion 56 rests with its side pointing to the right in FIG. 2 on the side of the retaining ring 66 pointing to the left in FIG. The guide element 50 can be compressed so far with very little pressure in the retaining ring 66, possibly even be used loosely in the retaining ring 66, without this would affect the operability of the exhaust valve 38. In the retaining ring 66 a plurality of channel-like fuel passage openings 71 are present.
Im Betrieb der Kolben-Kraftstoffpumpe 18 hebt das Ventilelement 44 vom Ventilsitz 42 ab, wenn der Druck im Förderraum 32 während eines Förderhubs des Pumpenkolbens 28 einen entsprechenden Öffnungswert erreicht. Der Hub des Ventilelements 44 wird jedoch durch den Hubanschlag 58 auf ein vorgegebenes Maß H begrenzt, welches dem Abstand zwischen dem Hubanschlag 58 und dem abragenden Rand der During operation of the piston fuel pump 18, the valve element 44 lifts off from the valve seat 42 when the pressure in the delivery chamber 32 reaches a corresponding opening value during a delivery stroke of the pump piston 28. However, the stroke of the valve element 44 is limited by the stroke stop 58 to a predetermined amount H, which is the distance between the stroke stop 58 and the projecting edge of the
Führungswand 48 des Ventilelements 44 bei geschlossenem Auslassventil 38 entspricht. Bei geöffnetem Auslassventil 38 strömt der Kraftstoff durch den Innenkanal 43 in der Gegenplatte 40, durch den Spalt zwischen Ventilsitz 42 und Boden 46 des Ventilelements 44, den Ringraum zwischen erstem Abschnitt 52 des Guide wall 48 of the valve element 44 with the exhaust valve 38 closed. When the exhaust valve 38 is open, the fuel flows through the inner channel 43 in the counter-plate 40, through the gap between the valve seat 42 and the bottom 46 of the valve element 44, the annular space between the first portion 52 of
Führungselements 50 und der Innenwand der Öffnung 41 im Pumpengehäuse 26, die Kraftstoff-Durchlassöffnungen 71 schließlich in die Hochdruckleitung 20. Guide member 50 and the inner wall of the opening 41 in the pump housing 26, the fuel passage openings 71 finally in the high-pressure line 20th
In Figur 3 ist eine alternative Ausführungsform eines Auslassventils 38 gezeigt. Dabei tragen hier wie nachfolgend solche Elemente und Bereiche, welche äquivalente Funktionen zu Elementen und Bereichen des Auslassventils von Figur 2 aufweisen, die gleichen Bezugszeichen. Sie werden nachfolgend nicht nochmals erläutert. In Figure 3, an alternative embodiment of an exhaust valve 38 is shown. Here, as below, such elements and regions which have equivalent functions to elements and regions of the outlet valve of FIG. 2 carry the same reference numerals. They will not be explained again below.
Das Auslassventil 38 der Figur 3 unterscheidet sich von jenem der Figur 2 The outlet valve 38 of Figure 3 differs from that of Figure 2
hauptsächlich durch die Ausgestaltung des Führungselements 50 und dessen mainly by the configuration of the guide element 50 and its
Halterung: In Figur 3 ist das Führungselement 50 als Sinter- oder MIM-Teil hergestellt. Radial außen hat das Führungselement 50 einen konstanten Durchmesser. Im Inneren weist es einen ersten ringförmigen Absatz auf, welcher den Hubanschlag 58 bildet, sowie einen zweiten Absatz, der den Stützabschnitt 60 für die Ventilfeder 64 bildet. Das Führungselement 50 ist durch sich nach radial außen erstreckende Flügel- oder Lamellenabschnitte 72 im Pumpengehäuse 26 verpresst, zwischen denen Holder: In Figure 3, the guide member 50 is made as a sintered or MIM part. Radially outward, the guide element 50 has a constant diameter. Inside, it has a first annular shoulder, which forms the stroke stop 58, and a second shoulder, which forms the support portion 60 for the valve spring 64. The guide member 50 is compressed by itself radially outwardly extending wing or fin sections 72 in the pump housing 26, between which
Zwischenräume vorhanden sind, welche die Kraftstoff-Durchlassöffnungen 71 bilden. Bei den Ausführungsformen der Figuren 4 bis 1 1 ist das Ventilelement 44 nicht topfsondern umgekehrt pilzförmig mit einer Ventilplatte 46 und einem "Stiel" 48. Ferner weist das zylindrische Führungselement 50 einen kleineren Innendurchmesser als das Ventilelement 44 auf, ist jedoch wie zuvor koaxial zum Ventilelement 44 angeordnet. Das zum Ventilelement 44 hin weisende Ende des Führungselements 50 bildet den Hubanschlag 58. Das Führungselement 50 ist mittels mehrerer radial abragender Flügel 72 im Pumpengehäuse 26 gehalten, zwischen denen Durchlassöffnungen 71 für den Kraftstoff vorhanden sind. Schließlich handelt es sich bei der Ventilfeder 64 um eine Flachmembranfeder, die an der Oberseite des Führungselements 50 befestigt ist. Intermediate spaces are present, which form the fuel passage openings 71. In the embodiments of Figures 4 to 11, the valve member 44 is not pot-shaped but mushroom-shaped with a valve plate 46 and a "stem" 48. Further, the cylindrical guide member 50 has a smaller inner diameter than the valve member 44 but is coaxial with the valve member as before 44 arranged. The end of the guide element 50 pointing toward the valve element 44 forms the stroke stop 58. The guide element 50 is held in the pump housing 26 by means of a plurality of radially projecting vanes 72, between which passage openings 71 for the fuel are present. Finally, the valve spring 64 is a flat diaphragm spring secured to the top of the guide member 50.
Bei den Ausführungsformen der Figuren 4 bis 7 ist die Flachmembranfeder 64 mit einem spiralig nach innen gewickelten Federarm 74 ausgeführt, an dessen Ende der Stiel 48 des Ventilelements 44 anliegt (Figuren 6 und 7), oder in dessen Ende das durchmesserkleineres Ende des Stiels 48 des Ventilelements 44 eingepasst ist (Figuren 4 und 5). In the embodiments of Figures 4 to 7, the flat diaphragm spring 64 is executed with a spiral inwardly wound spring arm 74 at the end of the stem 48 of the valve member 44 abuts (Figures 6 and 7), or in the end of the smaller diameter end of the stem 48 of the Valve element 44 is fitted (Figures 4 and 5).
Bei den Ausführungsformen der Figuren 8 bis 1 1 ist die Flachmembranfeder 64 rosettenartig ausgebildet mit einer Mehrzahl von radial sternförmig verlaufenden Federarmen 74, die in einem Zentrum 76 gehalten sind, an dem das Ende des Stiels 48 des Ventilelements 44 anliegt. Die Flachmembranfeder 64 der Figuren 10 und 1 1 weist darüber hinaus einen Zwischenring 78 auf. In the embodiments of Figures 8 to 1 1, the flat diaphragm spring 64 is formed like a rosette with a plurality of radial star-shaped spring arms 74 which are held in a center 76 against which abuts the end of the stem 48 of the valve member 44. The flat diaphragm spring 64 of FIGS. 10 and 11 also has an intermediate ring 78.

Claims

Ansprüche 1 . Kolben-Kraftstoffpumpe (18) für eine Brennkraftmaschine, mit einem Claims 1. Piston fuel pump (18) for an internal combustion engine, with a
Pumpengehäuse (26), einem Kolben (28), und mit einem Rückschlag-Auslassventil (38) mit einem Ventilelement (44) und einem Führungselement (50) zur Führung der Bewegung des Ventilelements (44), dadurch gekennzeichnet, dass das  Pump housing (26), a piston (28), and with a check-outlet valve (38) with a valve element (44) and a guide element (50) for guiding the movement of the valve element (44), characterized in that the
Führungselement (50) mindestens mittelbar in eine Öffnung (41 ) im Pumpengehäuse (26) radial eingepresst ist. Guide element (50) is at least indirectly pressed radially into an opening (41) in the pump housing (26).
2. Kolben-Kraftstoffpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass das Führungselement (50) einen Führungsabschnitt (52) zur Führung des Ventilelements (44) und einen Halterungsabschnitt (54) zur Halterung in der Öffnung (41 ) des 2. Piston fuel pump according to claim 1, characterized in that the guide element (50) has a guide portion (52) for guiding the valve element (44) and a mounting portion (54) for mounting in the opening (41) of
Pumpengehäuses (26) aufweist, wobei der Führungsabschnitt (52) und der Pump housing (26), wherein the guide portion (52) and the
Halterungsabschnitt (54) axial an unterschiedlichen Stellen des Führungselements (50) angeordnet sind.  Mounting portion (54) are arranged axially at different locations of the guide element (50).
3. Kolben-Kraftstoffpumpe (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Führungselement (50) in einen Haltering (66) eingepresst ist, der wiederum in das Pumpengehäuse (26) eingepresst ist, wobei der Haltering (66) vorzugsweise Kraftstoff-Durchlassöffnungen (71 ) aufweist. 3. Piston fuel pump (18) according to any one of the preceding claims, characterized in that the guide element (50) in a retaining ring (66) is pressed, which in turn is pressed into the pump housing (26), wherein the retaining ring (66) preferably Having fuel passage openings (71).
4. Kolben-Kraftstoffpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Führungselement (50) einen Hubanschlag (58) aufweist, welcher den Öffnungshub des Ventilelements (44) auf ein vorgegebenes Maß (H) begrenzt. 4. Piston fuel pump according to one of the preceding claims, characterized in that the guide element (50) has a stroke stop (58) which limits the opening stroke of the valve element (44) to a predetermined amount (H).
5. Kolben-Kraftstoffpumpe (18) nach Anspruch 4, dadurch gekennzeichnet, dass das Führungselement (50) koaxial zum und radial außerhalb vom Ventilelement (44) angeordnet ist und einen nach radial einwärts gerichteten Absatz aufweist, der den Hubanschlag (58) bildet. 5. Piston fuel pump (18) according to claim 4, characterized in that the guide element (50) is arranged coaxially with and radially outside of the valve element (44) and has a radially inwardly directed shoulder which forms the stroke stop (58).
6. Kolben-Kraftstoffpumpe (18) nach Anspruch 4, dadurch gekennzeichnet, dass das Führungselement (50) mindestens abschnittsweise einen kleineren 6. Piston fuel pump (18) according to claim 4, characterized in that the guide element (50) at least partially a smaller
Innendurchmesser als das Ventilelement (44) aufweist und koaxial zum Ventilelement (44) angeordnet ist, und dass das zum Ventilelement (44) hin weisende Ende des Führungselements (50) den Hubanschlag (58) bildet, oder dass es einen nach radial auswärts gerichteten Absatz aufweist, der den Hubanschlag bildet. Inner diameter than the valve element (44) and coaxial with the valve element (44) is arranged, and that the valve element (44) facing the end of the guide member (50) forms the stroke stop (58), or that it has a radially outwardly directed shoulder, which forms the stroke stop.
7. Kolben-Kraftstoffpumpe (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Ventilfeder (64) durch das Führungselement (50) geführt wird. 7. Piston fuel pump (18) according to any one of the preceding claims, characterized in that a valve spring (64) through the guide element (50) is guided.
8. Kolben-Kraftstoffpumpe (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Führungselement (50) einen Stützabschnitt (60) aufweist, an dem sich das vom Ventilelement (44) entgegengesetzte Ende einer Ventilfeder (64) abstützt. 8. Piston fuel pump (18) according to any one of the preceding claims, characterized in that the guide element (50) has a support portion (60) on which by the valve element (44) opposite end of a valve spring (64) is supported.
9. Kolben-Kraftstoffpumpe (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Ventilfeder als spiralig oder sternartig geformte9. piston fuel pump (18) according to any one of the preceding claims, characterized in that a valve spring as a spiral or star-shaped
Flachmembranfeder (64) ausgeführt ist, die an dem Führungselement (50) befestigt ist. Flat membrane spring (64) is mounted, which is fixed to the guide element (50).
10. Kolben-Kraftstoffpumpe (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Führungselement (50) ein Sinter- oder ein MIM-Teil ist. 10. Piston fuel pump (18) according to any one of the preceding claims, characterized in that the guide element (50) is a sintered or an MIM part.
1 1 . Kolben-Kraftstoffpumpe (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Ventilelement (44) topfförmige Gestalt hat. 1 1. Piston fuel pump (18) according to any one of the preceding claims, characterized in that the valve element (44) has cup-shaped shape.
EP13729946.7A 2012-06-28 2013-06-18 Piston fuel pump Active EP2867529B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012211107 2012-06-28
DE102012222826.8A DE102012222826A1 (en) 2012-06-28 2012-12-11 Piston fuel pump
PCT/EP2013/062578 WO2014001140A1 (en) 2012-06-28 2013-06-18 Piston fuel pump

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EP2867529A1 true EP2867529A1 (en) 2015-05-06
EP2867529B1 EP2867529B1 (en) 2019-10-16

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US (2) US10851752B2 (en)
EP (1) EP2867529B1 (en)
JP (1) JP6099739B2 (en)
KR (3) KR102020199B1 (en)
CN (1) CN104428533B (en)
DE (3) DE102012222823A1 (en)
WO (3) WO2014001126A1 (en)

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WO2014001126A1 (en) 2014-01-03
CN104428533B (en) 2018-10-09
CN104428533A (en) 2015-03-18
KR20150125730A (en) 2015-11-09
DE102012222826A1 (en) 2014-01-02
DE102012222823A1 (en) 2014-01-02
JP2015521715A (en) 2015-07-30
KR101536899B1 (en) 2015-07-16
US10851752B2 (en) 2020-12-01
WO2014001139A1 (en) 2014-01-03
KR102020199B1 (en) 2019-09-11
EP2867529B1 (en) 2019-10-16
DE102012222853A1 (en) 2014-01-02
KR20140070636A (en) 2014-06-10
US20150316013A1 (en) 2015-11-05
JP6099739B2 (en) 2017-03-22
US10352284B2 (en) 2019-07-16
KR20140136056A (en) 2014-11-27
US20180073477A1 (en) 2018-03-15
WO2014001140A1 (en) 2014-01-03

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