DE102015218698A1 - High-pressure fuel pump - Google Patents
High-pressure fuel pump Download PDFInfo
- Publication number
- DE102015218698A1 DE102015218698A1 DE102015218698.9A DE102015218698A DE102015218698A1 DE 102015218698 A1 DE102015218698 A1 DE 102015218698A1 DE 102015218698 A DE102015218698 A DE 102015218698A DE 102015218698 A1 DE102015218698 A1 DE 102015218698A1
- Authority
- DE
- Germany
- Prior art keywords
- pressure fuel
- piston
- fuel pump
- piston spring
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—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
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- 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
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
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- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/02—Fuel-injection apparatus having means for reducing wear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
- F02M2200/505—Adjusting spring tension by sliding spring seats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
- F02M2200/507—Adjusting spring tension by screwing spring 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
- F04B2203/00—Motor parameters
- F04B2203/06—Motor parameters of internal combustion engines
- F04B2203/0605—Rotational speed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Die Erfindung geht aus von einer Kraftstoffhochdruckpumpe für ein Einspritzsystem einer Brennkraftmaschine mit einem Gehäuse, in dem wenigstens ein Pumpenelement aufgenommen ist, wobei das Pumpenelement einen hubbeweglichen Kolben mit einer Kolbenfeder umfasst, der über eine Stößelbaugruppe an einem Nocken- oder Exzentertrieb abgestützt ist, wobei Kraftstoff über einen Zulauf angesaugt, in einen Pumpenarbeitsraum verdichtet und über einen Hochdruckabgang einem Kraftstoffhochdruckspeicher zugeführt wird, wobei Mittel vorgesehen sind, mit denen eine wirksame Kolbenfederkraft in Abhängigkeit von wenigstens einem Betriebsparameter der Kraftstoffhochdruckpumpe einstellbar ist.The invention relates to a high-pressure fuel pump for an injection system of an internal combustion engine with a housing in which at least one pump element is accommodated, wherein the pump element comprises a reciprocating piston with a piston spring which is supported via a plunger assembly on a cam or Exzentertrieb, wherein fuel aspirated via an inlet, compressed in a pump working chamber and fed via a high-pressure outlet to a high-pressure fuel storage means being provided, with which an effective piston spring force in dependence on at least one operating parameter of the high-pressure fuel pump is adjustable.
Description
Die Erfindung betrifft eine Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine gemäß den Merkmalen des Oberbegriffs des Anspruchs 1. The invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the features of the preamble of
Aus der
Die Kolbenfeder sorgt auch im Saughub dafür, dass der Tassen- oder Rollenstößel der Nockenkontur folgt, ohne abzuheben. Die Kolbenfederkraft ist dabei so groß ausgelegt bzw. dimensioniert, dass auch bei hohen Motordrehzahlen und damit bei hohen Drehzahlen der Pumpenwelle ein permanenter Kontakt zwischen Nocken und Stößel sichergestellt bzw. ein Abheben unterbunden wird. The piston spring also ensures in the suction stroke that the cup or roller tappet follows the cam contour without lifting. The piston spring force is designed and dimensioned so large that even at high engine speeds and thus at high speeds of the pump shaft ensures permanent contact between the cam and plunger or lifting is prevented.
Das hat allerdings zur Folge, dass die Federkraft bei mittleren bzw. niedrigen Drehzahlen viel zu groß ist, d.h. dass insbesondere in den emissionsrelevanten Fahrzeugbetriebszyklen durch zu hohe Federkräfte zu viel Reibung entsteht und damit zu viel CO2 emittiert wird. However, this has the consequence that the spring force at medium and low speeds is much too large, i. that too much friction is generated by too high spring forces, in particular in the emission-relevant vehicle operating cycles, and thus too much CO2 is emitted.
Aufgabe der Erfindung ist es, eine verbesserte Kraftstoffhochdruckpumpe für ein Einspritzsystem einer Brennkraftmaschine bereitzustellen. The object of the invention is to provide an improved high-pressure fuel pump for an injection system of an internal combustion engine.
Es wird eine Kraftstoffhochdruckpumpe für eine Brennkraftmaschine mit einem Gehäuse vorgeschlagen, wobei in dem Gehäuse wenigstens ein Pumpenelement aufgenommen ist, wobei das Pumpenelement einen hubbeweglichen Kolben mit einer Kolbenfeder umfasst, der über eine Stößelbaugruppe an einem Nocken- oder Exzentertrieb abgestützt ist, wobei Kraftstoff über einen Zulauf angesaugt, in einen Pumpenarbeitsraum verdichtet und über einen Hochdruckabgang einem Kraftstoffhochdruckspeicher zugeführt wird. Dabei sind Mittel vorgesehen, mit denen eine wirksame Kolbenfederkraft in Abhängigkeit von wenigstens einem Betriebsparameter der Kraftstoffhochdruckpumpe einstellbar ist. It is proposed a high-pressure fuel pump for an internal combustion engine having a housing, wherein in the housing at least one pump element is accommodated, wherein the pump element comprises a reciprocating piston with a piston spring which is supported via a plunger assembly on a cam or Exzentertrieb, wherein fuel via a Inlet sucked, compressed in a pump working space and fed via a high pressure outlet to a high-pressure fuel storage. In this case, means are provided with which an effective piston spring force in dependence on at least one operating parameter of the high-pressure fuel pump is adjustable.
Durch die vorgeschlagene Einstellbarkeit der Kolbenfederkraft können auf vorteilhafte Art und Weise die CO2-Emissionen im Rahmen des sog. Neuen Europäischen Fahrzyklus (NEFZ) bzw. im sog. Worldwide harmonized Light vehicle Test cycle sowie die negativen als auch positiven Drehmomentspitzen für den Antrieb der Hochdruckpumpe reduziert werden. Due to the proposed adjustability of the piston spring force, the CO2 emissions in the so-called New European Driving Cycle (NEDC) or in the so-called Worldwide Harmonized Light Vehicle Test Cycle and the negative as well as positive torque peaks for driving the high-pressure pump can be advantageously achieved be reduced.
In den Unteransprüchen sind weitere vorteilhafte Ausgestaltungen und Verbesserungen der Kraftstoffhochdruckpumpe aufgeführt. In the subclaims further advantageous refinements and improvements of the high-pressure fuel pump are listed.
In einer Ausführungsform sind die Mittel ausgebildet, um die wirksame Kolbenfederkraft durch ein Verändern der Einbaulänge der Kolbenfeder einzustellen. Somit kann eine Änderung der Kolbenfederkraft auf einfache Weise erreicht werden. In one embodiment, the means are adapted to adjust the effective piston spring force by changing the installation length of the piston spring. Thus, a change of the piston spring force can be achieved in a simple manner.
In einer weiteren Ausführung weist das Mittel ein im Federraum befindliches und in axialer Richtung verstellbares Anschlagelement auf, wobei ein stirnseitiges Ende der Kolbenfeder an dem Anschlagelement anliegt, und wobei die Mittel ausgebildet sind, um die axiale Position des Anschlagelementes zu verändern. Damit wird eine einfache und sicher funktionierende Verstellung der Kolbenfeder ermöglicht. In a further embodiment, the means comprises a stop element located in the spring chamber and adjustable in the axial direction, wherein a front end of the piston spring rests against the stop element, and wherein the means are adapted to change the axial position of the stop element. This allows a simple and safe working adjustment of the piston spring.
In einer weiteren Ausführung ist das Anschlagelement in Form von zwei Ringelementen ausgeführt, wobei beide Ringelemente über geneigt angeordnete Sägezahnflächen aufeinander aufliegen, wobei die Mittel einen Aktor umfassen, wobei der Aktor ausgebildet ist, um durch Verdrehen der Ringelemente gegeneinander eine axiale Position des Anschlagelements und damit eine Einbaulänge der Kolbenfeder zu verändern. Auf diese Weise können präzise Änderungen der Kolbenfederkraft durchgeführt werden. In another embodiment, the stop element is designed in the form of two ring elements, wherein both ring elements rest on inclined saw tooth surfaces, wherein the means comprise an actuator, wherein the actuator is designed to rotate by rotating the ring elements against each other an axial position of the stop element and thus to change an installation length of the piston spring. In this way, precise changes in the piston spring force can be performed.
In einer weiteren Ausführung ist das Anschlagelement innerhalb des Federraumes als Ringkolben ausgebildet, und wobei die Mittel ausgebildet sind, um den Ringkolben mechanisch oder hydraulisch in der axialen Position zu verschieben und damit die Einbaulänge der Kolbenfeder zu ändern. In a further embodiment, the stop element is formed within the spring chamber as an annular piston, and wherein the means are designed to move the annular piston mechanically or hydraulically in the axial position and thus to change the installation length of the piston spring.
In einer Ausführung sind die Mittel ausgebildet, um die Kolbenfederkraft in Abhängigkeit von einer Drehzahl einer Pumpenwelle einzustellen. Dadurch kann eine präzise Einstellung der Kolbenfederkraft erreicht werden. In one embodiment, the means are adapted to adjust the piston spring force in response to a rotational speed of a pump shaft. As a result, a precise adjustment of the piston spring force can be achieved.
Die in
Das Gehäuseteil
Der Kolben
In
In einem in
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102010043371 A1 [0002] DE 102010043371 A1 [0002]
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102015218698.9A DE102015218698A1 (en) | 2015-09-29 | 2015-09-29 | High-pressure fuel pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102015218698.9A DE102015218698A1 (en) | 2015-09-29 | 2015-09-29 | High-pressure fuel pump |
Publications (1)
Publication Number | Publication Date |
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DE102015218698A1 true DE102015218698A1 (en) | 2017-03-30 |
Family
ID=58281806
Family Applications (1)
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DE102015218698.9A Ceased DE102015218698A1 (en) | 2015-09-29 | 2015-09-29 | High-pressure fuel pump |
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DE (1) | DE102015218698A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3149686A1 (en) | 1980-12-15 | 1982-06-24 | Diesel Kiki Co. Ltd., Tokyo | FUEL INJECTION SYSTEM |
DE3643271A1 (en) | 1986-12-18 | 1988-06-23 | Kloeckner Humboldt Deutz Ag | Fuel injection pump with built-in timing device |
DE19531873C1 (en) | 1995-08-30 | 1996-11-07 | Daimler Benz Ag | Fuel high pressure pump for internal combustion engine |
DE102010043371A1 (en) | 2010-11-04 | 2012-05-10 | Robert Bosch Gmbh | High pressure fuel pump for internal combustion engine, has piston with central bore formed in inlet in a state coaxially to piston longitudinal axis, so that extending hole is formed in housing portion in a state connected to housing |
-
2015
- 2015-09-29 DE DE102015218698.9A patent/DE102015218698A1/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3149686A1 (en) | 1980-12-15 | 1982-06-24 | Diesel Kiki Co. Ltd., Tokyo | FUEL INJECTION SYSTEM |
DE3643271A1 (en) | 1986-12-18 | 1988-06-23 | Kloeckner Humboldt Deutz Ag | Fuel injection pump with built-in timing device |
DE19531873C1 (en) | 1995-08-30 | 1996-11-07 | Daimler Benz Ag | Fuel high pressure pump for internal combustion engine |
DE102010043371A1 (en) | 2010-11-04 | 2012-05-10 | Robert Bosch Gmbh | High pressure fuel pump for internal combustion engine, has piston with central bore formed in inlet in a state coaxially to piston longitudinal axis, so that extending hole is formed in housing portion in a state connected to housing |
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R012 | Request for examination validly filed | ||
R016 | Response to examination communication | ||
R081 | Change of applicant/patentee |
Owner name: VITESCO TECHNOLOGIES GMBH, DE Free format text: FORMER OWNER: CONTINENTAL AUTOMOTIVE GMBH, 30165 HANNOVER, DE |
|
R002 | Refusal decision in examination/registration proceedings | ||
R003 | Refusal decision now final | ||
R081 | Change of applicant/patentee |
Owner name: VITESCO TECHNOLOGIES GMBH, DE Free format text: FORMER OWNER: VITESCO TECHNOLOGIES GMBH, 30165 HANNOVER, DE |