DE102004057056A1 - Quality regulated single piston high-pressure fuel pump for fuel injection engines has high-pressure pump area formed over piston top side and second pump chamber formed under its lower surface by tapering of piston - Google Patents

Quality regulated single piston high-pressure fuel pump for fuel injection engines has high-pressure pump area formed over piston top side and second pump chamber formed under its lower surface by tapering of piston Download PDF

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Publication number
DE102004057056A1
DE102004057056A1 DE200410057056 DE102004057056A DE102004057056A1 DE 102004057056 A1 DE102004057056 A1 DE 102004057056A1 DE 200410057056 DE200410057056 DE 200410057056 DE 102004057056 A DE102004057056 A DE 102004057056A DE 102004057056 A1 DE102004057056 A1 DE 102004057056A1
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Germany
Prior art keywords
piston
pump
pressure
fuel
tapering
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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.)
Withdrawn
Application number
DE200410057056
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German (de)
Inventor
Karlheinrich Winkelmann
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Individual
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Individual
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Priority to DE200410057056 priority Critical patent/DE102004057056A1/en
Publication of DE102004057056A1 publication Critical patent/DE102004057056A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F04B49/243—Bypassing by keeping open the inlet valve
    • 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
    • F04B5/00—Machines or pumps with differential-surface pistons

Abstract

Fuel pump (1) has pump piston lower side (6) within high-pressure pump surface and piston top side (5) proceeds with piston rod sealed to surrounding so that upper and lower surfaces of pump piston (7) have equal areas. High-pressure pump area is formed over topside of piston and second pump chamber formed under its lower surface by tapering of piston between its lower surface and sealing ring towards pump drive.

Description

Kolbenflächengleiche, mengengeregelte kolbenflächengleiche Ein-Kolben-Hochdruck-Kraftstoffpumpe.Same piston area, Volume-controlled piston surface equal A piston-type high-pressure fuel pump.

In den Kraftstoff-Direkt-Einspritzmotoren fremd gezündeter Ottomotoren der neuesten Generation werden mengengeregelte Ein-Kolben-Hochdruck-Kraftstoffpumpen eingesetzt, die, kennfeldgeregelt, die verdichtete Kraftstoffmenge dem tatsächlich aktuellen Verbrauch anpassen. Dies wird erreicht, indem bei der Druck erzeugenden Aufwärtsbewegung des Pumpenkolbens der Hochdruckpumpe der überschüssige Kraftstoff über das offene Einlassventil so lange in den Niederdruckbereich zurückdrückt, bis das berechnete Einspritzvolumen erreicht ist, woraufhin ein Magnet das Einlassventil in der Pumpe schließt infolgedessen durch den sich weiter nach oben bewegenden Pumpenkolben der Hochdruck in der Pumpenkammer aufgebaut wird.In the newest fuel-direct-injection engines of foreign-fired gasoline engines Generation are volume-controlled single-piston high-pressure fuel pumps used, the map-controlled, the compressed fuel amount actually adjust current consumption. This is achieved by the Pressure-generating upward movement the pump piston of the high pressure pump the excess fuel over the open inlet valve as long as in the low pressure area pushes back to the calculated injection volume is reached, whereupon a magnet As a result, the inlet valve in the pump closes by the further up the pump piston moving the high pressure in the Pump chamber is constructed.

Der Vorteil dieser Anordnung liegt in der Verringerung der Antriebsleistung der Hochdruckkraftstoffpumpe.Of the Advantage of this arrangement lies in the reduction of the drive power the high pressure fuel pump.

Nachteil der Konstruktion ist, dass der Hochdruckpumpenkolben die überschüssige Kraftstoffmenge gegen den Vorförderdruck in das Niederdrucksystem zurückpumpen muß. Das hat Verlustleistung zur Folge und erzeugt Pulsationen, die durch zusätzliche Maßnahmen ausgeglichen werden müssen.disadvantage The design is that the high-pressure pump piston the excess amount of fuel against the prefeed pressure pump back into the low pressure system got to. The has power loss and generates pulsations caused by additional activities have to be compensated.

Diese Nachteile werden mit der erfindungsgemäßen Gestaltung der Kraftstoff-Hochdruckpumpe 1 vermieden.These disadvantages are with the inventive design of the high-pressure fuel pump 1 avoided.

Die Grundidee der Erfindung ist die Flächengleichheit über und unter dem Pumpenkolben 7 bei gleichzeitig hydraulisch offener Verbindung 8 der zugehörigen Kammern 5, 6. Dadurch wird gewährleistet, dass, unabhängig von der Höhe des Vorförderdruckes, die Summe der auf den Pumpenkolben einwirkenden Kräfte null ist.The basic idea of the invention is the surface equality above and below the pump piston 7 at the same time hydraulically open connection 8th the associated chambers 5 . 6 , This ensures that, regardless of the level of Vorförderdruckes, the sum of the forces acting on the pump piston forces is zero.

Da sich gleichzeitig bei der Bewegung des Pumpenkolbens 7 das Kammervolumen oberhalb 5 und unterhalb 6 des Pumpenkolbens 7 in gleichem Maße entgegengesetzt ändert, ist der Kraftaufwand für die Verschiebung des Kolbens 7 bei geöffnetem Einlassventil 4 gering, weil das überschüssige Kraftstoffvolumen ohne Überwindung einer Druckdifferenz zwischen den Kammern über 5 und unter 6 dem Pumpenkolben 7 hin- und her geschoben wird. Das spart Verlustleistung und damit Kraftstoff und verhindert Pulsation im Niederdruckbereich der Kraftstoffzuführung.As at the same time during the movement of the pump piston 7 the chamber volume above 5 and below 6 of the pump piston 7 to the same extent changes, is the force required for the displacement of the piston 7 with the inlet valve open 4 low, because the excess fuel volume without overcoming a pressure difference between the chambers over 5 and under 6 the pump piston 7 is pushed back and forth. This saves power loss and thus fuel and prevents pulsation in the low pressure range of the fuel supply.

1 zeigt den schematischen Aufbau der kolbenflächengleichen Hochdruckkraftstoffpumpe 1. Über eine Zuflussbohrung 2 fließt Kraftstoff in den Niederdruckbereich 3 der Hochdruckpumpe 1. Bei geöffnetem Einlassventil 4 herrschen im oberen Pumpenraum 5 und im Raum 6 unter dem Pumpenkolben 7 über die Verbindungsbohrung 8 der gleiche, von der Vorförderpumpe erzeugte Druck, da die vom Vorförderdruck beaufschlagten Flächen gleich groß sind. Um diese Flächengleichheit zu erreichen, musste der Pumpenkolben 7 an der, zuvor frei endenden Fläche mit einer zusätzlichen Kolbenstange 9 versehen werden, die aus dem kraftstoffbeaufschlagten Bereich herausgeführt ist. Dies bedingt, genau wie im Bereich der vorzugsweise von einem Nocken 10 angetriebenen unteren Kolbenstange 11 eine Abdichtung 12 zum mit Kraftstoff gefüllten Niederdruckbereich 3 hin. 1 shows the schematic structure of the piston surface-equivalent high-pressure fuel pump 1 , About an inflow hole 2 fuel flows into the low-pressure area 3 the high pressure pump 1 , When the inlet valve is open 4 prevail in the upper pump room 5 and in the room 6 under the pump piston 7 over the connecting hole 8th the same pressure generated by the prefeed pump, since the areas acted upon by the prefeed pressure are the same. To achieve this surface equality, the pump piston had to 7 at the previously free-ending surface with an additional piston rod 9 be provided, which is led out of the fuel-loaded area. This conditional, as in the area of preferably a cam 10 driven lower piston rod 11 a seal 12 to the fuel filled low pressure area 3 out.

Zusätzlich muß auch der Pumpenkolben 7 im antriebsseitigen Bereich verjüngt werden, um damit die flächengleiche untere Druckfläche zu erzeugen, die es ermöglicht, den überschüssigen Kraftstoff zwischen den beiden Räumen oberhalb 5 und unterhalb 6 des Pumpenkolbens 7 ohne nennenswerten Kraftaufwand hin und her zu schieben.In addition, the pump piston must also 7 be tapered in the drive-side area, so as to produce the same area lower pressure surface, which allows the excess fuel between the two spaces above 5 and below 6 of the pump piston 7 without much effort to push back and forth.

Claims (1)

Mengengeregelte, kolbenflächengleiche Ein-Kolben-Hochdruck-Kraftstoffpumpe dadurch gekennzeichnet, dass innerhalb des Hochdruckpumpengehäuses eine Pumpenkolbenunterseite besteht, daß die Kolbenoberseite mit einer, ebenfalls zur Umgebung hin abgedichteten Kolbenstange, fortgesetzt wird, sodaß an der Ober- und Unterseite des Pumpenkolbens Flächengleichheit entsteht und dass durch die Verjüngung des Kolbens zwischen seiner Unterseite und dem Dichtring in Richtung Pumpenantrieb neben dem Hochdruckpumpenraum über der Oberseite des Kolbens ein zweiter Pumpenraum unter der Unterseite des Kolbens existiert.Volume-controlled, piston surface equal one-piston high-pressure fuel pump, characterized in that within the high-pressure pump housing, a pump piston underside, that the piston top is continued with a, also sealed to the environment piston rod, so that surface uniformity arises at the top and bottom of the pump piston and that due to the taper of the piston between its underside and the sealing ring in the direction of the pump drive, a second pump space under the underside of the piston exists next to the high-pressure pump space above the top of the piston.
DE200410057056 2004-11-25 2004-11-25 Quality regulated single piston high-pressure fuel pump for fuel injection engines has high-pressure pump area formed over piston top side and second pump chamber formed under its lower surface by tapering of piston Withdrawn DE102004057056A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200410057056 DE102004057056A1 (en) 2004-11-25 2004-11-25 Quality regulated single piston high-pressure fuel pump for fuel injection engines has high-pressure pump area formed over piston top side and second pump chamber formed under its lower surface by tapering of piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410057056 DE102004057056A1 (en) 2004-11-25 2004-11-25 Quality regulated single piston high-pressure fuel pump for fuel injection engines has high-pressure pump area formed over piston top side and second pump chamber formed under its lower surface by tapering of piston

Publications (1)

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DE102004057056A1 true DE102004057056A1 (en) 2006-06-08

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DE200410057056 Withdrawn DE102004057056A1 (en) 2004-11-25 2004-11-25 Quality regulated single piston high-pressure fuel pump for fuel injection engines has high-pressure pump area formed over piston top side and second pump chamber formed under its lower surface by tapering of piston

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006062875B4 (en) * 2005-01-19 2016-12-15 Denso Corporation High pressure pump with a compression chamber and a fuel chamber at the opposite end of a plunger
DE102008045730B4 (en) 2007-09-07 2020-01-16 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Return-free fuel pump unit and vehicle equipped with it

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006062875B4 (en) * 2005-01-19 2016-12-15 Denso Corporation High pressure pump with a compression chamber and a fuel chamber at the opposite end of a plunger
DE102006063010B3 (en) * 2005-01-19 2016-12-15 Denso Corporation A method of controlling a high pressure pump having a compression chamber and a fuel chamber at the opposite end of a plunger
DE102006000015B4 (en) * 2005-01-19 2016-12-15 Denso Corporation High pressure pump with a compression chamber and a fuel chamber at the opposite end of a plunger
DE102006062874B4 (en) 2005-01-19 2018-03-15 Denso Corporation High pressure pump with a compression chamber and a fuel chamber at the opposite end of a plunger
DE102006063011B3 (en) 2005-01-19 2019-06-06 Denso Corporation A method of controlling a high pressure pump having a compression chamber and a fuel chamber at the opposite end of a plunger
DE102006063012B3 (en) 2005-01-19 2019-10-10 Denso Corporation A method of controlling a high pressure pump having a compression chamber and a fuel chamber at the opposite end of a plunger
DE102006063042B3 (en) 2005-01-19 2020-01-09 Denso Corporation High pressure pump with a compression chamber and a fuel chamber at the opposite end of a plunger
DE102008045730B4 (en) 2007-09-07 2020-01-16 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Return-free fuel pump unit and vehicle equipped with it

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