DE102009045468A1 - Gear pump, particularly fuel pump, for fuel system of motor vehicle, is provided with two gears in housing, where gears are in mesh with each other and support suction area and pressure area - Google Patents
Gear pump, particularly fuel pump, for fuel system of motor vehicle, is provided with two gears in housing, where gears are in mesh with each other and support suction area and pressure area Download PDFInfo
- Publication number
- DE102009045468A1 DE102009045468A1 DE200910045468 DE102009045468A DE102009045468A1 DE 102009045468 A1 DE102009045468 A1 DE 102009045468A1 DE 200910045468 DE200910045468 DE 200910045468 DE 102009045468 A DE102009045468 A DE 102009045468A DE 102009045468 A1 DE102009045468 A1 DE 102009045468A1
- Authority
- DE
- Germany
- Prior art keywords
- gears
- fuel
- housing
- pump
- gear pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
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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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/041—Arrangements for driving gear-type pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/023—Means for varying pressure in common rails
- F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
- F02M63/024—Means for varying pressure in common rails by bleeding fuel pressure between the low pressure pump and the high pressure pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/21—Manufacture essentially without removing material by casting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/22—Manufacture essentially without removing material by sintering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/24—Manufacture essentially without removing material by extrusion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft eine Zahnradpumpe, insbesondere eine Kraftstoff- oder Ölpumpe, mit mindestens zwei Zahnrädern, welche in einem Gehäuse angeordnet sind und miteinander kämmen und Kraftstoff von einem Saugbereich zu einem Druckbereich fördern.The invention relates to a gear pump, in particular a fuel or oil pump, with at least two gears, which are arranged in a housing and mesh with each other and promote fuel from a suction to a pressure range.
Eine Zahnradpumpe der eingangs genannten Art ist beispielsweise aus der
Die bekannten Zahnradpumpen weisen bevorzugt ein Gehäuse aus Aluminiumdruckguss auf, wobei die Zahnräder aus Sinterstahl hergestellt sind. Bekanntermaßen dehnen sich bei einer Erwärmung der Zahnradpumpe während des Betriebs des Kraftstoffsystems die Gehäuseteile des Gehäuses, sowie die Zahnräder ihrem jeweiligen Wärmeausdehnungskoeffizienten entsprechend aus. Die unterschiedliche Ausdehnung hat einen Einfluss auf zwischen den Gehäuseteilen und den Zähnen vorhandene Spaltmaße. Der Begriff Spaltmaß steht dabei für den Abstand zwischen den Zähnköpfen und dem Gehäuse. Diese Spaltmaße wiederum haben einen unmittelbaren Einfluss auf den volumetrischen und den mechanischen Wirkungsgrad eines Förderaggregats. Eine temperaturbedingte Vergrößerung des Spaltmaßes, bspw. bei einem Heißstart des Kraftfahrzeugs, kann zu einer Erhöhung eines Leckstroms beitragen, so dass sich zumindest der volumetrische Wirkungsgrad der Zahnradpumpe verschlechtert.The known gear pumps preferably have a housing made of die-cast aluminum, wherein the gears are made of sintered steel. As is known, when the gear pump is heated during operation of the fuel system, the housing parts of the housing, as well as the gears, expand in accordance with their respective thermal expansion coefficients. The difference in expansion has an influence on gaps existing between the housing parts and the teeth. The term gap dimension stands for the distance between the teeth heads and the housing. These gaps in turn have a direct influence on the volumetric and mechanical efficiency of a delivery unit. A temperature-induced increase in the gap dimension, for example, in the case of a hot start of the motor vehicle, can contribute to an increase in a leakage current, so that at least the volumetric efficiency of the gear pump deteriorates.
Offenbarung der ErfindungDisclosure of the invention
Die vorliegende Erfindung hat die Aufgabe, eine Zahnradpumpe der eingangs genannten Art so weiterzuentwickeln, dass sie die aus dem Stand der Technik bekannten Nachteil möglichst vermeidet.The present invention has the object, a gear pump of the type mentioned in such a way that it avoids the known from the prior art disadvantage as possible.
Zur Lösung der Aufgabe wird vorgeschlagen, dass das Material der Zahnräder und des Gehäuses aus dem gleichen Grundwerkstoff bestehen. Der Erfindung liegt die Idee zu Grunde, dass bei Verwendung des gleichen Grundwerkstoffs sich das Gehäuse und die Zahnräder bei einer bestimmten Temperatur in gleichem Maße ausdehnen. Das Spaltmaß bleibt dabei also nahezu unverändert. Dies führt vorteilhafterweise dazu, dass der Kraftstoff unabhängig von der Betriebstemperatur des Kraftstoffsystems im Kraftfahrzeug unter gleichen Bedingungen gefördert wird und nicht durch aufwändige Korrekturmaßnahmen von der Motorsteuerung temperaturabhängig nachgeregelt werden muss. Eine von der Motorsteuerung ermittelte spezifische Nennfördermenge wird bei allen Betriebstemperaturen gewährleistet. Dies gilt natürlich für einen Kaltstart im Winter genauso wie für positive Celsius-Grade (z. B. Heißstart).To solve the problem it is proposed that the material of the gears and the housing consist of the same base material. The invention is based on the idea that when using the same base material, the housing and the gears at a certain temperature expand to the same extent. The gap remains so almost unchanged. This advantageously leads to the fact that the fuel is conveyed under the same conditions regardless of the operating temperature of the fuel system in the motor vehicle and does not have to be readjusted by temperature-dependent control of the engine control by complex corrective measures. A specific nominal flow rate determined by the engine control is guaranteed at all operating temperatures. Of course this applies to a cold start in winter as well as to positive Celsius grades (eg hot start).
Für die Erfindung wichtige Merkmale finden sich ferner in der nachfolgenden Beschreibung und in der Zeichnung, wobei die Merkmale sowohl in Alleinstellung als auch in unterschiedlichen Kombinationen für die Erfindung wichtig sein können, ohne dass hierauf jeweils explizit hingewiesen wird. Vorteilhafte Weiterbildungen finden sich in den Unteransprüchen.Features which are important for the invention can also be found in the following description and in the drawing, wherein the features, both alone and in different combinations, can be important for the invention without any explicit reference being made thereto. Advantageous developments can be found in the subclaims.
Besonders vorteilhaft ist, dass das Material der Zahnräder und des Gehäuses als Grundwerkstoff Aluminium umfassen. Aluminium ist ein kostengünstiges Leichtmetall und hat aufgrund einer sich sehr schnell an der Luft bildenden dünnen Oxidschicht eine hohe Beständigkeit gegen Umwelteinflüsse und gewährleistet damit eine hohe Lebensdauer. Aluminium-Legierungen mit 1–3% Magnesium oder Silizium lassen sich gut zu Aluminium-Druckguss gießen und können spanabhebend bearbeitet werden. Sogenannte Aluminium-Knetlegierungen lassen sich auch bei niedrigen Temperaturen gut umformen, biegen, pressen und schmieden. Außerdem sind aus den Aluminium-Knetlegierungen Aluminium Sintermischungen herstellbar. Das bedeutet, dass alle nötigen Eigenschaften der Zahnräder (spanabhebende Bearbeitung) und des Gehäuses (Verformbarkeit, Korrosionsbeständigkeit) gut mit Aluminium realisiert werden können. Die für die Legierungen nötigen Legierungsbestandteile verändern den Wärmeausdehnungskoeffizienten nur unwesentlich, so dass die Zahnräder und das Gehäuse das gleiche wärmeabhängige Verhalten aufweisen. Durch die Verwendung von Aluminium als Grundwerkstoff hat die Zahnradpumpe vorteilhafterweise ein geringes Gewicht, ein gutes Dämpfverhalten, wenig Verschleiß und weniger Eigendynamik.It is particularly advantageous that comprise the material of the gears and the housing as a base material aluminum. Aluminum is a low-cost light metal and has a high resistance to environmental influences due to a very thin forming in the air thin oxide layer and thus ensures a long service life. Aluminum alloys with 1-3% magnesium or silicon can be cast well into die-cast aluminum and can be machined. So-called wrought aluminum alloys can be well formed, bent, pressed and forged even at low temperatures. In addition, aluminum sintered mixtures can be produced from the wrought aluminum alloys. This means that all the necessary properties of the gears (machining) and the housing (deformability, corrosion resistance) can be realized well with aluminum. The alloy constituents required for the alloys only insignificantly change the thermal expansion coefficient, so that the gears and the housing have the same heat-dependent behavior. By using aluminum as a base material, the gear pump advantageously has a low weight, a good damping behavior, little wear and less momentum.
Ferner ist vorteilhaft, dass die Zahnräder durch Sintern hergestellt werden. Beim Sintern werden Pulvermassen aus unterschiedlichen Materialien zunächst so geformt, dass wenigstens ein minimaler Zusammenhalt der Pulverpartikel gegeben ist. Deshalb darf z. B. bei der Pulvermetallurgie die Korngröße 0,6 mm nicht übersteigen. Ein vorgepresster ’Grünling’ wird im Anschluss durch eine Wärmebehandlung unterhalb der Schmelztemperatur verdichtet und ausgehärtet. Das gesinterte Material bleibt dabei porös, um in den Kapillaren bspw. Schmierstoffe aufnehmen zu können. Für die Zahnräder bieten sich besonderes Aluminium-Legierungen mit Silizium und/oder Magnesium (z. B. AlSiMg oder AlMgCu oder ALCuMg) an, die eine optimale Verschleißbeständigkeit und Festigkeit gewährleisten und dabei eine wirtschaftliche Bearbeitbarkeit garantieren.Furthermore, it is advantageous that the gears are produced by sintering. During sintering, powder materials of different materials are first of all shaped in such a way that at least a minimum cohesion of the powder particles is given. Therefore, z. B. in powder metallurgy, the grain size 0.6 mm not exceed. A pre-pressed 'green' is then by a heat treatment below the melting temperature compacted and cured. The sintered material remains porous in order to be able to absorb, for example, lubricants in the capillaries. The gears are made of special aluminum alloys with silicon and / or magnesium (eg AlSiMg or AlMgCu or ALCuMg), which ensure optimum wear resistance and strength while guaranteeing economic machinability.
Nachfolgend wird anhand der Figuren ein Ausführungsbeispiel der Erfindung beispielhaft erläutert. Es zeigen:An embodiment of the invention will be explained by way of example with reference to FIGS. Show it:
Der Kraftstoff wird dabei aus einem Kraftstofftank
In Strömungsrichtung wird der Kraftstoff durch den Antriebs- bzw. Kurbelraum
Die Pumpenkammer
In der den Zahnrädern
Im Betrieb der Zahnradpumpe
Die mit dem Druckkanal
Im Betrieb des Kraftstoffsystem
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 10134622 A1 [0002] DE 10134622 A1 [0002]
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910045468 DE102009045468A1 (en) | 2009-10-08 | 2009-10-08 | Gear pump, particularly fuel pump, for fuel system of motor vehicle, is provided with two gears in housing, where gears are in mesh with each other and support suction area and pressure area |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910045468 DE102009045468A1 (en) | 2009-10-08 | 2009-10-08 | Gear pump, particularly fuel pump, for fuel system of motor vehicle, is provided with two gears in housing, where gears are in mesh with each other and support suction area and pressure area |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009045468A1 true DE102009045468A1 (en) | 2011-04-14 |
Family
ID=43734440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910045468 Ceased DE102009045468A1 (en) | 2009-10-08 | 2009-10-08 | Gear pump, particularly fuel pump, for fuel system of motor vehicle, is provided with two gears in housing, where gears are in mesh with each other and support suction area and pressure area |
Country Status (1)
Country | Link |
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DE (1) | DE102009045468A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011089936A1 (en) | 2011-12-27 | 2013-06-27 | Robert Bosch Gmbh | Housing structure for gear pump used for fuel delivery to fuel system in e.g. motor car, has insert portion provided for forming inner housing portion which is integral with cup-shaped outer portion to form remaining of housing portion |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10134622A1 (en) | 2001-07-17 | 2003-02-06 | Bosch Gmbh Robert | Gear pump has slots formed in circumferential walls of pump chamber and through which radial distance between outside circumference of gearwheels and circumferential walls is increased |
-
2009
- 2009-10-08 DE DE200910045468 patent/DE102009045468A1/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10134622A1 (en) | 2001-07-17 | 2003-02-06 | Bosch Gmbh Robert | Gear pump has slots formed in circumferential walls of pump chamber and through which radial distance between outside circumference of gearwheels and circumferential walls is increased |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011089936A1 (en) | 2011-12-27 | 2013-06-27 | Robert Bosch Gmbh | Housing structure for gear pump used for fuel delivery to fuel system in e.g. motor car, has insert portion provided for forming inner housing portion which is integral with cup-shaped outer portion to form remaining of housing portion |
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Legal Events
Date | Code | Title | Description |
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R012 | Request for examination validly filed | ||
R002 | Refusal decision in examination/registration proceedings | ||
R003 | Refusal decision now final |