EP1483503B1 - Fuel pump for an internal combustion engine - Google Patents
Fuel pump for an internal combustion engine Download PDFInfo
- Publication number
- EP1483503B1 EP1483503B1 EP02779213A EP02779213A EP1483503B1 EP 1483503 B1 EP1483503 B1 EP 1483503B1 EP 02779213 A EP02779213 A EP 02779213A EP 02779213 A EP02779213 A EP 02779213A EP 1483503 B1 EP1483503 B1 EP 1483503B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- fuel pump
- support element
- base part
- support
- 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.)
- Expired - Lifetime
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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
- F04B1/0439—Supporting or guiding means for the pistons
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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
Definitions
- the invention relates to a fuel pump according to the preamble of claim 1.
- a fuel pump for example, known as a radial piston pump.
- a central eccentric shaft is mounted in a housing.
- a lifting ring is placed on an eccentric portion of the eccentric shaft.
- the sliding blocks are connected to a cylindrical piston which defines a working space with its end opposite the eccentric shaft. The piston is acted upon by a compression spring against the shoe or the flat surface of the cam ring.
- the compression spring is supported on an end portion of the piston, which has a significantly larger diameter than the shaft of the piston.
- the end portion and the piston skirt are in one piece and, for example, unscrewed from the solid.
- To guide the compression spring and the voltage reduction in the transition areas between the piston skirt and the end portion it is necessary to provide punctures and heels with different diameters. This leads, especially in conjunction with the associated large differences in diameter to a complex machining, which has a detrimental effect on the cost of manufacturing the fuel pump.
- the WO 99/45271 discloses a fuel pump having a separate from the piston support member on which the biasing member is supported and which is connected to the piston.
- the present invention has the object, a fuel pump of the type mentioned in such a way that it can be produced more cheaply.
- the piston of the fuel pump is much simpler. In the simplest case, it can consist of a simple straight cylinder, which has no change in diameter. A complex machining of the piston is thus not required, which significantly reduces the cost of the fuel pump according to the invention.
- the support of the biasing element usually a compression spring, which acts on the piston against the eccentric or camshaft takes place in the fuel pump according to the invention via a separate support element which is fixedly connected to the piston.
- the connection of the support member with the piston can be done in different ways: It is possible, for example, a pressing, a shrinking, welding, gluing and other, still running in more detail below mounting variants. Although an additional step is required for the attachment of the support member on the piston, but this is cheaper than the o. G. Machining the piston.
- a support member in the form of a support ring is very easy to manufacture, which also benefits the cost of the fuel pump.
- the support element is in two parts and comprises a support ring connected to the end region of the piston and an intermediate element pushed onto the piston between the prestressing element and the support ring.
- This makes it possible to choose such a material for the support ring, which can be optimally secured to the piston.
- a material can be selected which can be shaped in a simple manner so that the biasing element is optimally held and guided. This development thus additionally increases the reliability of the fuel pump according to the invention.
- the support element bears with a portion of a retaining ring, which is partially received in a groove in the eccentric or camshaft end facing the piston.
- the fuel pump comprises a guide sleeve which is movable with the piston and which cooperates with a housing-fixed guide section.
- a fuel pump configured in this way therefore operates with high efficiency.
- Such a fuel pump can be produced cost-effectively, in particular if the support element is integral with the guide sleeve.
- the support member may also include a radially inwardly directed annular collar which is supported on a radially outwardly directed annular collar of the piston.
- the support element is thus pressed by the biasing member with its annular collar against the corresponding annular collar of the piston.
- the thus created connection of the support member with the piston allows a safe return of the piston after a compression stroke, without Transverse forces are introduced from the support member into the piston. This is particularly advantageous if the support element is integral with the guide sleeve.
- the fuel pump comprises a base part which rests on the eccentric or camshaft facing end face of the piston.
- a base also makes it possible to make the piston of a material which is optimal for its function as a compression punch.
- the base part of a material, which can absorb the relative movements, which occur by the rotation of the cam or eccentric shaft relative to the piston, without being subject to excessive wear.
- the friction forces between the base part and the eccentric or camshaft can be reduced by appropriate material pairings, resulting in lower lateral forces.
- the guide sleeve has a radially inwardly directed annular collar which projects into an annular space lying between the support element and the base part.
- the base part has a raised portion which covers the support member axially in some areas, and the support member is fixedly connected to the base part over the raised portion.
- a base part is thus cup-shaped and is formed by the raised portion relative to the Support element automatically centered during assembly.
- the attachment of the base part on the support element can, for example, via a locking ring, which is inserted in grooves on the one hand in the lateral surface of the support member and on the other hand in the lateral surface of the raised portion.
- the support element has at least one bend, which surrounds the base part from the outside and holds axially. Such a bend is easy to manufacture and facilitates the overall assembly of the fuel pump, since the base member is captively connected to the support member.
- Fig. 1 This is a radial piston pump with three cylinders 12a, 12b and 12c, wherein in the following only the components of the cylinder 12a will be explained in detail.
- cylinder 12a In the drawing, only those components of the cylinder 12a are provided with reference numerals.
- the components of the cylinders 12b and 12c are identical to those of the cylinder 12a.
- the radial piston pump 10 comprises a housing 14. In a bore (without reference numeral), a piston 16 is received axially displaceable. The piston 16 is limited with his in Fig. 1 an inlet valve 20 may connect the working space 18 with a fuel line, not shown. An exhaust valve, also not shown, can connect the working space 18 to a fuel line and further to a high-pressure rail ("rail").
- an eccentric shaft is mounted with an eccentric portion 22.
- a cam ring 24 is placed, which in the region of the individual cylinders 12a - 12c each have a plane worked contact surface 26.
- a designed as a sliding shoe base 28 is indirectly and even closer To be displayed manner acted upon by a compression spring 30 against the contact surface 26.
- the compression spring 30 is received in an annular space 32 of the housing 14. This is bounded radially inward by a pipe section-like guide section 34.
- the piston 16 is axially slidably and fluid-tightly received.
- the piston 16 has an end region 36 facing the eccentric section 22 or the cam ring 24, which has a larger diameter than the remaining piston 16.
- the end region 36 is partially received in a complementary recess 38 in the base part 28.
- an annular disk-shaped support member 40 At a formed between the piston skirt 39 and the end portion 36 of the piston 16 paragraph 41 is an annular disk-shaped support member 40 at.
- the support member 40 has a radially inwardly extending holding portion 42 and an axially extending guide portion 44. Through these two portions 42 and 44, the support member 40 is centered with respect to the longitudinal axis of the piston 16.
- the support member 40 In its radially outer region, the support member 40 has a circumferentially extending and "open” in the axial direction groove-like recess 46 in which the in Fig. 2 bottom end of the compression spring 30 is received. In this way, the compression spring 30 is radially centered. At its radially outer edge, the support member 40 distributed over its circumference on a plurality of hook-like bends 48, which surround a shoulder 50 which is formed on the outer circumferential surface of the base member 28, with some play. In this way, the base part 28 is held axially on the piston 16.
- the radial piston pump 10 operates as follows: By a Rotation of the eccentric shaft with the eccentric portion 22, the center of the cam ring 24 moves along a circular path. The contact surfaces 26 of the cam ring 24 thereby move on the one hand in the axial direction of the respective cylinder 12 and also laterally to the longitudinal axis of the respective cylinder 12. By the axial movement of the contact surfaces 26 and the restoring force of the compression spring 30, the piston 16 via the base member 28 in a offset axial reciprocation. As a result, fuel is either sucked into the working space 18, or the fuel present in the working space 18 is compressed and ejected to the fuel manifold.
- Fig. 3 is a modification of the eccentric portion 22 facing portion of the piston 16 is shown.
- carry such elements and areas, which equivalent functions to those in the FIGS. 1 and'2 have shown embodiment, the same reference numerals. They are not explained again in detail.
- the support member 40 is formed in two parts. It comprises a support ring 52 which is pressed onto the piston 16. In this way, the support ring 52 is fixed axially immovably on the piston 16. In Fig. 3 From above, an intermediate element 54 is pushed onto the piston 16, which is centered with a holding portion 42 and a guide portion 44 relative to the support ring 52.
- cup guide This comprises a cup-shaped guide member 56 which abuts with the outside of a bottom 58 on the contact surface 26 of the cam ring 24.
- the end portion 36 of the piston 16 is supported on the inside of the bottom 58 of the cup-shaped guide member 56.
- a peripheral wall 60 of the cup-shaped guide part 56 is guided with its outer side in a guide portion 62 of the housing 14. The introduced from the contact surface 26 during operation of the radial piston pump 10 in the bottom 58 of the cup-shaped guide member 56 lateral forces are thus derived via the peripheral wall 60 directly into the guide portion 62 of the housing 14.
- the piston 16 remains free of lateral force.
- the support element is in Fig. 4 formed as a one-piece support ring 40 which is pressed onto the piston 16.
- the end portion 36 of the piston 16 has no changes in diameter.
- the support member 40 in turn in two parts a support ring 52, which is pressed onto the piston 16, and an intermediate element 54.
- the end portion 36 of the piston 16 again has a larger diameter than the shaft 39 of the piston 16 and thus forms a radially outwardly directed annular collar 64.
- This annular collar 64 is on the one hand between a radially inwardly directed annular collar 66 of a guide sleeve 68 and a guided on the end face of the piston 16 base member 28 axially.
- the base part 28 has at its radially outer edge on a circumferential raised portion 70, which covers the guide sleeve 68 in the axial direction in some areas. How out Fig. 7 can be seen, on the one hand on the inside of the raised portion 70 has a circumferential groove 72 and on the other hand on the outside of the guide sleeve 68, a circumferential groove 74 is present. A locking ring 76 is accommodated on the one hand in the groove 72 and on the other hand in the groove 74, so that the guide sleeve 68 and the base part 28 are firmly connected to each other.
- the guide sleeve 68 is slidably guided on a guide portion 62 of the housing 14 in the axial direction.
- transverse forces which are introduced via the contact surface 26 of the cam ring 24 in the base part 28, introduced via the guide sleeve 68 in the guide portion 62 of the housing 14.
- the guide portion 62 is part of a socket 14 a, which is shrunk into a housing portion 14 b.
- the guide sleeve 68 has a radially outwardly directed annular collar 44, on which the compression spring 30 is supported. In this way, the piston 16 is indirectly acted upon by the restoring force of the compression spring 30.
- the guide sleeve 68 thus also forms the support element 40 at the same time.
- FIG. 8 Yet another embodiment is in Fig. 8 shown.
- the end portion 36 of the piston 16 again has the same diameter as the shaft 39 of the piston 16.
- the support member 40 is formed as a support ring, the holding portion 42 rests against a retaining ring 78 in a circumferential groove (without reference numerals) in the end portion 36th of the piston 16 is located.
- transverse forces are again kept away from the piston 16 by a guide sleeve 68 cooperates with a guide portion 62 of the housing 14.
- the base part 28 has an in Fig. 8 upper section 80 of smaller diameter and one in Fig. 8 lower portion 82 of larger diameter.
- the upper side of the portion 80 of the base part 28 abuts against the end face of the piston 16 facing it.
- annular space 84 is present, in which a radially inwardly directed annular collar 66 of the guide sleeve 68 protrudes.
- the radially outer edge of the portion 82 of the base member 28 abuts against the inner wall of the guide sleeve 68. In this way, lateral forces are also kept away from the piston 16 here.
- a roller 86 available. Through these, the lateral forces are minimized again.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Details Of Reciprocating Pumps (AREA)
- Reciprocating Pumps (AREA)
Description
Die Erfindung betrifft eine Kraftstoffpumpe nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel pump according to the preamble of claim 1.
Vom Markt her ist eine Kraftstoffpumpe bspw. als Radialkolbenpumpe bekannt. Bei ihr ist eine zentrale Exzenterwelle in einem Gehäuse gelagert. Auf einen Exzenterabschnitt der Exzenterwelle ist ein Hubring aufgesetzt. Über den Umfang des Hubrings verteilt sind ebene Flächen ausgebildet, an denen Gleitschuhe anliegen. Die Gleitschuhe sind mit einem zylindrischen Kolben verbunden, welcher mit seinem der Exzenterwelle entgegengesetzten Ende einen Arbeitsraum begrenzt. Der Kolben wird von einer Druckfeder gegen den Gleitschuh bzw. die ebene Fläche des Hubrings beaufschlagt.From the market, a fuel pump, for example, known as a radial piston pump. In her, a central eccentric shaft is mounted in a housing. On an eccentric portion of the eccentric shaft, a lifting ring is placed. Distributed over the circumference of the cam ring flat surfaces are formed on which rest against sliding shoes. The sliding blocks are connected to a cylindrical piston which defines a working space with its end opposite the eccentric shaft. The piston is acted upon by a compression spring against the shoe or the flat surface of the cam ring.
Bei der bekannten Kraftstoffpumpe sind drei Zylinder vorgesehen, welche jeweils einen entsprechenden Kolben und einen entsprechenden Arbeitsraum aufweisen. Bei einer Bewegung der Exzenterwelle wird der Kolben in eine Hin- und Herbewegung versetzt, der im Arbeitsraum vorhandene Kraftstoff komprimiert und über entsprechende Ventileinrichtungen bspw. in eine Kraftstoff-Sammelleitung ("Rail") einer Brennkraftmaschine ausgestoßen.In the known fuel pump three cylinders are provided which each have a corresponding piston and a corresponding working space. During a movement of the eccentric shaft of the piston is set in a reciprocating motion, which compresses existing fuel in the working space and ejected via corresponding valve devices, for example. In a fuel rail ("rail") of an internal combustion engine.
Bei der vom Markt her bekannten Kraftstoffpumpe stützt sich die Druckfeder an einem Endabschnitt des Kolbens ab, welcher einen deutlich größeren Durchmesser aufweist als der Schaft des Kolbens. Der Endabschnitt und der Kolbenschaft sind einstückig und bspw. aus dem Vollen herausgedreht. Zur Führung der Druckfeder und zur Spannungsverminderung in den Übergangsbereichen zwischen dem Kolbenschaft und dem Endabschnitt ist es erforderlich, Einstiche und Absätze mit unterschiedlichen Durchmessern vorzusehen. Dies führt vor allem in Verbindung mit den einhergehenden großen Durchmesserunterschieden zu einer aufwändigen spanabhebenden Bearbeitung, was sich bei den Herstellkosten für die Kraftstoffpumpe nachteilig auswirkt.In the fuel pump known from the market, the compression spring is supported on an end portion of the piston, which has a significantly larger diameter than the shaft of the piston. The end portion and the piston skirt are in one piece and, for example, unscrewed from the solid. To guide the compression spring and the voltage reduction in the transition areas between the piston skirt and the end portion, it is necessary to provide punctures and heels with different diameters. This leads, especially in conjunction with the associated large differences in diameter to a complex machining, which has a detrimental effect on the cost of manufacturing the fuel pump.
Die
Die vorliegende Erfindung hat die Aufgabe, eine Kraftstoffpumpe der eingangs genannten Art so weiterzubilden, dass sie kostengünstiger hergestellt werden kann.The present invention has the object, a fuel pump of the type mentioned in such a way that it can be produced more cheaply.
Diese Aufgabe wird durch eine Kraftstoffpumpe mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a fuel pump with the features of claim 1.
Bei der erfindungsgemäßen Kraftstoffpumpe ist der Kolben der Kraftstoffpumpe deutlich einfacher aufgebaut. Im einfachsten Fall kann er aus einem einfachen geraden Zylinder bestehen, der keinerlei Durchmesseränderung aufweist. Eine aufwändige spanabhebende Bearbeitung des Kolbens ist somit nicht erforderlich, was die Kosten der erfindungsgemäßen Kraftstoffpumpe erheblich senkt.In the fuel pump according to the invention, the piston of the fuel pump is much simpler. In the simplest case, it can consist of a simple straight cylinder, which has no change in diameter. A complex machining of the piston is thus not required, which significantly reduces the cost of the fuel pump according to the invention.
Die Abstützung des Vorspannelements, üblicherweise einer Druckfeder, welches den Kolben gegen die Exzenter- oder Nockenwelle beaufschlagt, erfolgt bei der erfindungsgemäßen Kraftstoffpumpe über ein separates Stützelement, welches mit dem Kolben fest verbunden ist. Die Verbindung des Stützelements mit dem Kolben kann dabei auf unterschiedliche Art und Weise erfolgen: Möglich ist bspw. ein Aufpressen, ein Aufschrumpfen, ein Verschweißen, ein Kleben und andere, weiter unten noch im Detail ausgeführte Befestigungsvarianten. Zwar ist für die Befestigung des Stützelements am Kolben ein zusätzlicher Arbeitsschritt erforderlich, dieser ist kostenmäßig jedoch günstiger als die o. g. spanabhebende Bearbeitung des Kolbens.The support of the biasing element, usually a compression spring, which acts on the piston against the eccentric or camshaft takes place in the fuel pump according to the invention via a separate support element which is fixedly connected to the piston. The connection of the support member with the piston can be done in different ways: It is possible, for example, a pressing, a shrinking, welding, gluing and other, still running in more detail below mounting variants. Although an additional step is required for the attachment of the support member on the piston, but this is cheaper than the o. G. Machining the piston.
Ein Stützelement in Form eines Stützrings ist sehr einfach herzustellen, was ebenfalls den Kosten für die Kraftstoffpumpe zugute kommt.A support member in the form of a support ring is very easy to manufacture, which also benefits the cost of the fuel pump.
Vorteilhafte Weiterbildungen der erfindungsgemäßen Kraftstoffpumpe sind in Unteransprüchen angegeben.Advantageous developments of the fuel pump according to the invention are specified in subclaims.
Dabei wird vorgeschlagen, dass das Stützelement zweiteilig ist und einen mit dem Endbereich des Kolbens verbundenen Stützring und ein zwischen Vorspannelement und Stützring auf den Kolben aufgeschobenes Zwischenelement umfasst. Dies ermöglicht es, für den Stützring ein solches Material zu wählen, welches sich am Kolben optimal befestigen lässt. Für das Zwischenelement kann dagegen ein Material gewählt werden, welches auf einfache Art und Weise so geformt werden kann, dass das Vorspannelement optimal gehalten und geführt ist. Diese Weiterbildung erhöht also zusätzlich die Funktionssicherheit der erfindungsgemäßen Kraftstoffpumpe.In this case, it is proposed that the support element is in two parts and comprises a support ring connected to the end region of the piston and an intermediate element pushed onto the piston between the prestressing element and the support ring. This makes it possible to choose such a material for the support ring, which can be optimally secured to the piston. For the intermediate element, however, a material can be selected which can be shaped in a simple manner so that the biasing element is optimally held and guided. This development thus additionally increases the reliability of the fuel pump according to the invention.
In einer anderen Weiterbildung wird vorgeschlagen, dass das Stützelement mit einem Abschnitt an einem Sicherungsring anliegt, der bereichsweise in einer Nut in dem der Exzenter- oder Nockenwelle zugewandten Endbereich des Kolbens aufgenommen ist. Diese Befestigungsmöglichkeit ist sehr einfach und kann ggf. unter Zerstörung des Sicherungsrings, auch wieder gelöst werden.In another embodiment, it is proposed that the support element bears with a portion of a retaining ring, which is partially received in a groove in the eccentric or camshaft end facing the piston. This mounting option is very simple and can possibly be solved by destroying the locking ring, again.
Vorgeschlagen wird auch, dass die Kraftstoffpumpe eine mit dem Kolben bewegliche Führungshülse umfasst, welche mit einem gehäusefesten Führungsabschnitt zusammenarbeitet. Hierdurch wird der Tatsache Rechnung getragen, dass im Betrieb Querkräfte in das Pumpengehäuse abgeleitet werden müssen. Zwar können diese Querkräfte auch über die Führung des Kolbens im Gehäuse aufgenommen werden, vor allem aus Dichtigkeitsgründen ist es jedoch günstiger, wenn der Kolben nur in axialer Richtung belastet wird. Dies wird durch die erfindungsgemäße Führungshülse ermöglicht, da diese, die Querkräfte von der Exzenter- oder Nockenwelle unter Umgehung des Kolbens direkt in den gehäusefesten Führungsabschnitt ableitet. Eine solchermaßen ausgestaltete Kraftstoffpumpe arbeitet daher mit hohem Wirkungsgrad.It is also proposed that the fuel pump comprises a guide sleeve which is movable with the piston and which cooperates with a housing-fixed guide section. This takes into account the fact that transverse forces must be dissipated into the pump housing during operation. Although these transverse forces can also be absorbed by the leadership of the piston in the housing, but mainly for reasons of tightness, it is more favorable if the piston is loaded only in the axial direction. This is made possible by the guide sleeve according to the invention, since this, the lateral forces derived from the eccentric or camshaft, bypassing the piston directly into the housing-fixed guide portion. A fuel pump configured in this way therefore operates with high efficiency.
Kostengünstig hergestellt werden kann eine derartige Kraftstoffpumpe insbesondere dann, wenn das Stützelement mit der Führungshülse einstückig ist.Such a fuel pump can be produced cost-effectively, in particular if the support element is integral with the guide sleeve.
Das Stützelement kann auch einen nach radial einwärts gerichteten Ringbund aufweisen, welcher sich an einem nach radial auswärts gerichteten Ringbund des Kolbens abstützt. Das Stützelement wird also von dem Vorspannelement mit seinem Ringbund gegen den entsprechenden Ringbund des Kolbens gedrückt. Die hierdurch geschaffene Verbindung des Stützelements mit dem Kolben ermöglicht eine sichere Rückstellung des Kolbens nach einem Kompressionshub, ohne dass Querkräfte von dem Stützelement in den Kolben eingeleitet werden. Dies ist insbesondere dann von Vorteil, wenn das Stützelement mit der Führungshülse einstückig ist.The support member may also include a radially inwardly directed annular collar which is supported on a radially outwardly directed annular collar of the piston. The support element is thus pressed by the biasing member with its annular collar against the corresponding annular collar of the piston. The thus created connection of the support member with the piston allows a safe return of the piston after a compression stroke, without Transverse forces are introduced from the support member into the piston. This is particularly advantageous if the support element is integral with the guide sleeve.
Eine andere vorteilhafte Ausgestaltung der erfindungsgemäßen Kraftstoffpumpe sieht vor, dass die Kraftstoffpumpe ein Basisteil umfasst, welches an der der Exzenter- oder Nockenwelle zugewandten Stirnfläche des Kolbens anliegt. Ein solches Basisteil ermöglicht es ebenfalls, den Kolben aus einem Material auszuführen, welches optimal für seine Funktion als Kompressionsstempel ist. Andererseits ist es möglich, das Basisteil aus einem Material auszuführen, welches die Relativbewegungen, welche durch die Drehung der Nocken- oder Exzenterwelle gegenüber dem Kolben auftreten, aufnehmen kann, ohne einem übermäßigen Verschleiß zu unterliegen. Ferner können durch entsprechende Materialpaarungen auch die Reibungskräfte zwischen dem Basisteil und der Exzenter- oder Nockenwelle verringert werden, was zu geringeren Querkräften führt. Diese Weiterbildung hat also zusätzliche Vorteile im Hinblick auf die Funktion der erfindungsgemäßen Kraftstoffpumpe.Another advantageous embodiment of the fuel pump according to the invention provides that the fuel pump comprises a base part which rests on the eccentric or camshaft facing end face of the piston. Such a base also makes it possible to make the piston of a material which is optimal for its function as a compression punch. On the other hand, it is possible to carry out the base part of a material, which can absorb the relative movements, which occur by the rotation of the cam or eccentric shaft relative to the piston, without being subject to excessive wear. Furthermore, the friction forces between the base part and the eccentric or camshaft can be reduced by appropriate material pairings, resulting in lower lateral forces. This development thus has additional advantages with regard to the function of the fuel pump according to the invention.
Dabei wird wiederum bevorzugt, wenn die Führungshülse einen nach radial einwärts gerichteten Ringbund aufweist, der in einen zwischen Stützelement und Basisteil liegenden Ringraum ragt. Hierdurch ist die Führungshülse in axialer Richtung sicher gehalten, und gleichzeitig ist die Montage der erfindungsgemäßen Kraftstoffpumpe einfach und somit ebenfalls kostengünstig.In this case, it is again preferred if the guide sleeve has a radially inwardly directed annular collar which projects into an annular space lying between the support element and the base part. As a result, the guide sleeve is held securely in the axial direction, and at the same time, the assembly of the fuel pump according to the invention is simple and therefore also inexpensive.
Vorteilhaft ist dabei auch, wenn das Basisteil einen hochgezogenen Abschnitt aufweist, welcher das Stützelement axial bereichsweise überdeckt, und das Stützelement mit dem Basisteil über den hochgezogenen Abschnitt fest verbunden ist. Ein solches Basisteil ist also tassenförmig ausgebildet und wird durch den hochgezogenen Abschnitt gegenüber dem Stützelement bei der Montage automatisch zentriert. Die Befestigung des Basisteils am Stützelement kann bspw. über einen Sicherungsring erfolgen, welcher in Nuten einerseits in der Mantelfläche des Stützelements und andererseits in der Mantelfläche des hochgezogenen Abschnitts eingelegt ist.It is also advantageous if the base part has a raised portion which covers the support member axially in some areas, and the support member is fixedly connected to the base part over the raised portion. Such a base part is thus cup-shaped and is formed by the raised portion relative to the Support element automatically centered during assembly. The attachment of the base part on the support element can, for example, via a locking ring, which is inserted in grooves on the one hand in the lateral surface of the support member and on the other hand in the lateral surface of the raised portion.
Eine vorteilhafte Weiterbildung der erfindungsgemäßen Kraftstoffpumpe zeichnet sich auch dadurch aus, dass das Stützelement mindestens eine Umbiegung aufweist, welche das Basisteil von außen umgreift und axial hält. Eine solche Umbiegung ist einfach herzustellen und erleichtert die Montage insgesamt der Kraftstoffpumpe, da das Basisteil unverlierbar mit dem Stützelement verbunden ist.An advantageous development of the fuel pump according to the invention is also characterized in that the support element has at least one bend, which surrounds the base part from the outside and holds axially. Such a bend is easy to manufacture and facilitates the overall assembly of the fuel pump, since the base member is captively connected to the support member.
Nachfolgend werden besonders bevorzugte Ausführungsbeispiele der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung im Detail erläutert. In der Zeichnung zeigen:
- Figur 1
- einen Schnitt durch einen Bereich eines ersten Ausführungsbeispiels einer Radialkolben-Kraftstoffpumpe;
- Figur 2'
- einen Teilschnitt durch ein Detail der Kraftstoffpumpe von
Fig. 1 ; - Figur 3
- einen Teilschnitt durch Komponenten eines zweiten Ausführungsbeispiels einer Kraftstoffpumpe;
- Figur 4
- einen Teilschnitt durch Komponenten eines dritten Ausführungsbeispiels einer Kraftstoffpumpe;
- Figur 5
- einen Teilschnitt durch Komponenten eines vierten Ausführungsbeispiels einer Kraftstoffpumpe;
- Figur 6
- einen Schnitt durch Komponenten eines fünften Ausführungsbeispiels einer Kraftstoffpumpe;
- Figur 7
- ein vergrößertes Detail von
Fig. 6 ; und - Figur 8
- einen Schnitt durch Komponenten eines sechsten Ausführungsbeispiels einer Kraftstoffpumpe.
- FIG. 1
- a section through a portion of a first embodiment of a radial piston fuel pump;
- FIG. 2 '
- a partial section through a detail of the fuel pump of
Fig. 1 ; - FIG. 3
- a partial section through components of a second embodiment of a fuel pump;
- FIG. 4
- a partial section through components of a third embodiment of a fuel pump;
- FIG. 5
- a partial section through components of a fourth embodiment of a fuel pump;
- FIG. 6
- a section through components of a fifth embodiment of a fuel pump;
- FIG. 7
- an enlarged detail of
Fig. 6 ; and - FIG. 8
- a section through components of a sixth embodiment of a fuel pump.
In
Die Radialkolbenpumpe 10 umfasst ein Gehäuse 14. In einer Bohrung (ohne Bezugszeichen) ist ein Kolben 16 axial verschieblich aufgenommen. Der Kolben 16 begrenzt mit seiner in
Im Gehäuse 14 der Radialkolbenpumpe 10 ist eine Exzenterwelle mit einem Exzenterabschnitt 22 gelagert. Auf den Exzenterabschnitt 22 ist ein Hubring 24 aufgesetzt, der im Bereich der einzelnen Zylinder 12a - 12c jeweils eine plan gearbeitete Kontaktfläche 26 aufweist. Ein als Gleitschuh ausgebildetes Basisteil 28 wird mittelbar und auf noch näher darzustellende Art und Weise von einer Druckfeder 30 gegen die Kontaktfläche 26 beaufschlagt. Die Druckfeder 30 ist in einem Ringraum 32 des Gehäuses 14 aufgenommen. Dieser wird nach radial innen von einem rohrabschnittartigen Führungsabschnitt 34 begrenzt. In diesem ist wiederum der Kolben 16 axial gleitend und fluiddicht aufgenommen. Die Verbindung des Kolbens 16 mit dem Basisteil 28 und die kolbenseitige Abstützung der Druckfeder 30 wird nun im Detail im Zusammenhang mit
Der Kolben 16 weist einen dem Exzenterabschnitt 22 bzw. den Hubring 24 zugewandten Endbereich 36 auf, welcher einen größeren Durchmesser als der restliche Kolben 16 hat. Der Endbereich 36 ist bereichsweise in einer komplementären Ausnehmung 38 im Basisteil 28 aufgenommen. An einem zwischen dem Kolbenschaft 39 und dem Endbereich 36 des Kolbens 16 gebildeten Absatz 41 liegt ein ringscheibenförmiges Stützelement 40 an. Das Stützelement 40 besitzt einen sich radial einwärts erstreckenden Halteabschnitt 42 und einen sich axial erstreckenden Führungsabschnitt 44. Durch diese beiden Abschnitte 42 und 44 wird das Stützelement 40 gegenüber der Längsachse des Kolbens 16 zentriert.The
In seinem radial äußeren Bereich weist das Stützelement 40 eine sich in Umfangsrichtung erstreckende und in axialer Richtung "geöffnete" rillenartige Vertiefung 46 auf, in der das in
Die Radialkolbenpumpe 10 arbeitet folgendermaßen: Durch eine Rotation der Exzenterwelle mit dem Exzenterabschnitt 22 bewegt sich der Mittelpunkt des Hubrings 24 längs einer Kreisbahn. Die Kontaktflächen 26 des Hubrings 24 bewegen sich hierdurch zum einen in axialer Richtung der jeweiligen Zylinder 12 und auch lateral zur Längsachse der jeweiligen Zylinder 12. Durch die Axialbewegung der Kontaktflächen 26 und die Rückstellkraft der Druckfeder 30 wird der Kolben 16 über das Basisteil 28 in eine axiale Hin- und Herbewegung versetzt. Hierdurch wird Kraftstoff entweder in den Arbeitsraum 18 eingesaugt, oder der im Arbeitsraum 18 vorhandene Kraftstoff wird komprimiert und zur Kraftstoff-Sammelleitung hin ausgestoßen.The
In
Im Unterschied zu den
In den
Aufgrund der oben beschriebenen Bewegung der Kontaktflächen 26 lateral zur Längsachse des jeweiligen Zylinders 12 werden von der Kontaktfläche 26 aufgrund der vorhandenen Reibung auch laterale Kräfte in das Basisteil 28 eingeleitet. Bei der obigen Radialkolbenpumpe 10 (
In den
Das Stützelement ist in
Bei dem in den
Das Basisteil 28 weist an seinem radial äußeren Rand einen umlaufenden hochgezogenen Abschnitt 70 auf, welcher die Führungshülse 68 in axialer Richtung bereichsweise überdeckt. Wie aus
Die Führungshülse 68 ist auf einem Führungsabschnitt 62 des Gehäuses 14 in axialer Richtung gleitend geführt. Somit werden Querkräfte, welche über die Kontaktfläche 26 des Hubrings 24 in das Basisteil 28 eingeleitet werden, über die Führungshülse 68 in den Führungsabschnitt 62 des Gehäuses 14 eingeleitet. Wie aus
Ein nochmals anderes Ausführungsbeispiel ist in
Das Basisteil 28 weist einen in
Claims (10)
- Fuel pump (10) for an internal combustion engine, having a housing (14), having at least one piston (16), having a working space (18) which is delimited in regions by the piston (16), having an eccentric shaft (22) or camshaft which acts at least indirectly on the piston (16) at that end of the latter (36) which is situated opposite from the working space (18), and having a preload element (30) which at least indirectly loads the piston (16) against the eccentric shaft (22) or camshaft, with a support element (40) which is separate from the piston (16) being provided, which support element (40) is connected to that end region (36) of the piston (16) which faces toward the eccentric shaft (22) or camshaft, and on which support element (40) the preload element (30) is supported, characterized in that the support element (40) comprises a support ring (52).
- Fuel pump (10) according to Claim 1, characterized in that the support element (40) is formed in two parts and comprises a support ring (52), which is connected to the end region (36) of the piston (16), and an intermediate element (54) which is pushed onto the piston (16) between the preload element (30) and the support ring (52).
- Fuel pump (10) according to one of the preceding claims, characterized in that the support element (40) bears with a section (42) against a securing ring (78) which is held in regions in a groove in that end region (36) of the piston (16) which faces toward the eccentric shaft (22) or camshaft.
- Fuel pump (10) according to one of the preceding claims, characterized in that said fuel pump comprises a guide sleeve (68) which is movable with the piston (16) and which interacts with a guide section (62) which is fixed to the housing.
- Fuel pump (10) according to Claim 4, characterized in that the support element (40) is formed in one piece with the guide sleeve (68).
- Fuel pump (10) according to one of the preceding claims, characterized in that the support element (40) has a radially inwardly aligned annular collar (66) which is supported on a radially outwardly aligned annular collar (64) of the piston (16).
- Fuel pump (10) according to one of the preceding claims, characterized in that said fuel pump comprises a base part (28) which bears against that end surface of the piston (16) which faces toward the eccentric shaft (22) or camshaft.
- Fuel pump according to one of Claims 4 to 6 together with Claim 8, characterized in that the guide sleeve (68) has a radially inwardly aligned annular collar (66) which projects into an annular space (84) situated between the support element (40) and base part (28).
- Fuel pump (10) according to one of Claims 7 or 8, characterized in that the base part (28) has a turned-up section (70) which overlaps the support element (40) axially in regions, and the support element (40) is fixedly connected to the base part (28) by means of the turned-up section (70).
- Fuel pump (10) according to Claim 8, characterized in that the support element (40) has at least one bend (48) which engages around the base part (28) from the outside and holds the latter axially.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10200792A DE10200792A1 (en) | 2002-01-11 | 2002-01-11 | Fuel pump for an internal combustion engine |
DE10200792 | 2002-01-11 | ||
PCT/DE2002/004206 WO2003058064A1 (en) | 2002-01-11 | 2002-11-14 | Fuel pump for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1483503A1 EP1483503A1 (en) | 2004-12-08 |
EP1483503B1 true EP1483503B1 (en) | 2008-09-24 |
Family
ID=7711886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02779213A Expired - Lifetime EP1483503B1 (en) | 2002-01-11 | 2002-11-14 | Fuel pump for an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US6951165B2 (en) |
EP (1) | EP1483503B1 (en) |
JP (1) | JP4418681B2 (en) |
DE (2) | DE10200792A1 (en) |
WO (1) | WO2003058064A1 (en) |
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DE10355027A1 (en) * | 2003-11-25 | 2005-06-23 | Robert Bosch Gmbh | High-pressure pump, in particular for a fuel injection device of an internal combustion engine |
DE102004013245A1 (en) * | 2004-03-18 | 2005-10-06 | Robert Bosch Gmbh | Radial piston pump |
DE102004022431B4 (en) * | 2004-05-06 | 2007-02-08 | Siemens Ag | Radial piston pump with cam ring |
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DE102006032244A1 (en) * | 2006-07-12 | 2008-01-17 | Siemens Ag | Radial piston pump for high pressure fuel injection system, has high pressure piston formed as two-piece with cylindrical piston part and ring that are connected with each other in force-fitting and/or form-fitting manner |
DE102006043187B3 (en) * | 2006-09-14 | 2008-04-03 | Siemens Ag | Fluid pump, in particular high-pressure fuel pump for injection systems of internal combustion engines |
US8986253B2 (en) | 2008-01-25 | 2015-03-24 | Tandem Diabetes Care, Inc. | Two chamber pumps and related methods |
DE102008000824A1 (en) * | 2008-03-26 | 2009-10-01 | Robert Bosch Gmbh | Pump, in particular high-pressure fuel pump |
DE102008000955A1 (en) | 2008-04-03 | 2009-10-08 | Robert Bosch Gmbh | High pressure fuel pump for use as plug-in pump in crankcase, for operating internal combustion engine, has defined gap provided between inner diameter of sleeve and upper outlet of reduced diameter part of pump piston |
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IT1401914B1 (en) * | 2010-09-01 | 2013-08-28 | Bosch Gmbh Robert | PUMPING UNIT FOR FUEL SUPPLEMENT, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE AND RELATIVE ASSEMBLY METHOD |
JP5337824B2 (en) | 2011-01-14 | 2013-11-06 | 日立オートモティブシステムズ株式会社 | High pressure fuel supply pump |
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ITMI20112165A1 (en) * | 2011-11-28 | 2013-05-29 | Bosch Gmbh Robert | HIGH PRESSURE PUMP TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
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DE10039210A1 (en) * | 2000-08-10 | 2002-02-28 | Siemens Ag | Radial piston pump has two-part spring carrier in form of pivoted connecting element between piston and return spring |
-
2002
- 2002-01-11 DE DE10200792A patent/DE10200792A1/en not_active Ceased
- 2002-11-14 DE DE50212815T patent/DE50212815D1/en not_active Expired - Lifetime
- 2002-11-14 US US10/432,744 patent/US6951165B2/en not_active Expired - Lifetime
- 2002-11-14 JP JP2003558343A patent/JP4418681B2/en not_active Expired - Lifetime
- 2002-11-14 WO PCT/DE2002/004206 patent/WO2003058064A1/en active IP Right Grant
- 2002-11-14 EP EP02779213A patent/EP1483503B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP4418681B2 (en) | 2010-02-17 |
WO2003058064A1 (en) | 2003-07-17 |
EP1483503A1 (en) | 2004-12-08 |
US6951165B2 (en) | 2005-10-04 |
JP2005514557A (en) | 2005-05-19 |
US20040096337A1 (en) | 2004-05-20 |
DE50212815D1 (en) | 2008-11-06 |
DE10200792A1 (en) | 2003-07-31 |
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