EP1121531B1 - Radial piston pump for supplying fuel at high pressure - Google Patents
Radial piston pump for supplying fuel at high pressure Download PDFInfo
- Publication number
- EP1121531B1 EP1121531B1 EP99939926A EP99939926A EP1121531B1 EP 1121531 B1 EP1121531 B1 EP 1121531B1 EP 99939926 A EP99939926 A EP 99939926A EP 99939926 A EP99939926 A EP 99939926A EP 1121531 B1 EP1121531 B1 EP 1121531B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pump
- piston
- spring
- closing
- 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
- F04B1/0408—Pistons
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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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/464—Inlet valves of the check valve type
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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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/102—Disc valves
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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
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
- F02M2200/505—Adjusting spring tension by sliding spring seats
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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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
Definitions
- the invention relates to a radial piston pump according to the Genus of claim 1.
- the radial piston pump according to the invention with the features of Claim 1 has the advantage that the Open the suction valve at low pressure of the supplied Fuel is supported by the fact that increasing suction stroke of the pump piston the closing force of the Valve closing spring reduced. With a multi-piston pump an opening of all suction valves is thus reliably achieved and achieved a relatively high level of equal funding. Therefore is an opening pressure setting of the suction valves dispensable or permissible with reduced accuracy.
- a radial piston pump is included in DE 44 06 803 A1 axially flow-through pump piston known in the one Suction valve is arranged, the valve closing spring on the one hand on the closing body of the suction valve and on the other hand attacks the pump piston. When opening the suction valve rises however, the closing force of the spring increases with increasing stroke.
- the measure specified in claim 2 allows the Reduce the size of the radial piston pump because the Valve closing spring essentially within the construction volume of the pump piston is arranged. This arrangement will also achieved guidance of the valve closing spring.
- the development of the invention according to claim 4 is distinguished by direct introduction of the spring force into the Valve control components. Therefore only act the dimensional deviations of fewer components on the setting of the Suction valve off.
- FIG. 1 shows a Radial piston pump in section and Figure 2 as detail II in Figure 1, a suction valve of the pump on a larger scale.
- Radial piston pump 10 is for the High-pressure fuel generation in fuel injection systems of internal combustion engines, especially in a common rail injection system, intended.
- the radial piston pump 10 has a housing 11 in which a drive shaft 12 with a Eccentric section 13 is mounted. On the eccentric section 13, a cam ring 14 is guided.
- a piston foot 15 one with respect to Drive shaft 12 is longitudinally movable radially in the pump housing 11 guided pump piston 16 supported.
- the piston foot 15 is due to the effect of being coaxial with the pump piston 16 arranged piston spring 17, which on the one hand on the piston foot 15 and on the other hand attacks on the pump housing 11, always in System held on the cam ring 14.
- the pump piston 16 is a suction valve 18 and a pressure valve 19 are also assigned.
- the suction valve 18 is fuel, for example diesel oil, through a channel 20 of the pump housing 11 under low pressure fed. From the pressure valve 19 a channel 21 of the Pump housing 11, which from the pump piston 16th discharged fuel under high pressure.
- the Pump piston 16 with piston foot 15, piston spring 17, suction valve 18 and pressure valve 19 form a pump element 22 of the Radial piston pump 10. This is with other, for example equipped a total of three pump elements 22, which (in the drawing is not visible) offset by 120 ° in a radial plane to the axis of the drive shaft 12 in Pump housing 11 are arranged.
- the others Pump elements 22 are also with the channels 20 and 21 in connection. The following description of the Pump element 22 based on FIG. 2 thus applies equally for the other pump elements.
- the suction valve 18 is radial with respect to the drive shaft 12 following on the pump piston 16 in the pump housing 11 arranged.
- the suction valve has a valve plate 24 which in a bore 25 of the pump housing 11 with a Locking screw 26 is held down.
- the Valve seat 27 is thus fixed with respect to the housing arranged and is under low pressure with the fuel leading channel 20 in conductive connection.
- the suction valve 18 has a closing body 28 with a conical Valve plate 29, which with the valve seat 27 Valve plate 24 works together. When closed Suction valve 18 closes the valve plate 29 of the Closing body 28 approximately flush with the pump piston side End face of the valve plate 24.
- the in a cylinder space (displacement space) 32 des Pump housing 16 arranged pump piston 16 has a than Blind bore formed longitudinal bore 33, which in a flat bottom 34 ends.
- a Helical compression spring designed valve closing spring 35 added. Since the upper in FIG Pump pistons 16 are located close to the dead center extends the valve chamber 24 delimiting the cylinder space 22, the valve closing spring 35 is predominant Part of its length in the longitudinal bore 33 of the pump piston.
- the valve closing spring 35 largely has one Diameter of the longitudinal bore 33 of the pump piston 16 adjusted outer diameter and engages on the one hand Hole bottom 34 and on the other hand on the valve plate 29.
- the Closing body 28 of the suction valve 18 is with a provided pin-shaped shaft 36 which through the interior the valve closing spring 35 is guided and in the Drawn dead center position of the pump piston 16 and Closed position of the suction valve 18 to close to the Hole bottom 34 is enough.
- the one with its outer diameter almost the inside diameter of the valve closing spring 35 corresponding shaft 36 of the closing body 28 is over the Valve plate 29 extended by a small amount and in the valve plate 24 guided longitudinally. Because the axis to the pump piston 16 extending shaft 36 of the closing body 28 together with the valve closing spring 35 largely Fill the volume of the longitudinal bore 33 of the pump piston 16, As shown in FIG. 2, the dead volume of the pump is low.
- FIG. 2 also shows the cylinder space 32 on the suction valve side compared to the pump piston 16 slightly enlarged and stands in this enlarged Section with the pressure valve 19 in connection.
- the Valve closing spring 35 In the drawn position of the pump piston 16, the Valve closing spring 35 a maximum closing force on the Valve plate 29 of the suction valve 18 and holds it closed. During the suction stroke of the pump piston 16, this becomes from the position shown towards the Eccentric section 13 of the drive shaft 12 moves. there the valve closing spring 35 experiences a reduction in its Closing force.
- the suction valve 18 through the channel 20 supplied fuel under low pressure exercises one of the Spring force opposing opening force on the Valve plate 29 out. If the opening force is predominant the suction valve 18 is open, i.e. the valve plate 29 lifts off the valve seat 27 and moves a little Measure into the cylinder space 32.
- Opening the Suction valve 18 takes place depending on the pressure of the supplied fuel: opening takes place at high pressure of the suction valve 18 already at a low suction stroke Pump piston 16 instead; at low pressure it will Suction valve opened when the pump piston 16 has a larger one Has completed suction stroke.
- the valve closing spring 35 is however designed so that at low pressures of supplied fuel, the suction valve 18 at large suction stroke of the pump piston 16 opens safely and a partial filling of the cylinder space 32 takes place. Because of the seized Opening the suction valve 18 is also in a corresponding manner the partial filling of the remaining pump elements 22 of the Radial piston pump 10 given.
Description
Die Erfindung geht aus von einer Radialkolbenpumpe nach der Gattung des Patentanspruchs 1.The invention relates to a radial piston pump according to the Genus of claim 1.
Es ist schon eine solche Radialkolbenpumpe bekannt (DE 23 38 489 B2), bei welcher das Saugventil einen von seinem Schließkörper achsgleich zum Pumpenkolben ausgehenden Schaft hat, auf dem außerhalb des Zylinderraums die Ventilschließfeder sitzt. Diese greift einerseits am Schaft und andererseits mittelbar am Pumpengehäuse an. Beim Öffnen des Saugventils steigt daher mit dem Hub die Schließkraft der Feder an.Such a radial piston pump is already known (DE 23 38 489 B2), in which the suction valve is one of its closing body is aligned axially with the pump piston On the outside of the cylinder space Valve closing spring is seated. This grips the shaft on the one hand and on the other hand indirectly on the pump housing. When opening of the suction valve therefore increases the closing force with the stroke the spring.
Bei derartigen Radialkolbenpumpen mit mehreren Pumpenkolben (Pumpenelementen) werden hohe Anforderungen an die Gleichförderung gestellt: bei niedriger Fördermenge sollen alle Pumpenelemente fördern, und die Fördermenge der einzelnen Pumpenelemente soll in engen Grenzen differieren. Bei niedrigem Druck des der Radialkolbenpumpe zugeführten Kraftstoffs ergeben sich bereits bei geringen Öffnungsdruckunterschieden der Saugventile der Pumpenelemente Schwierigkeiten, diese Anforderungen zu erfüllen. In such radial piston pumps with several pump pistons (Pump elements) place high demands on the Equal funding provided: with a low funding amount convey all pump elements, and the flow rate of the individual pump elements should differ within narrow limits. At low pressure of the radial piston pump Fuel already result at low Differences in opening pressure of the suction valves Pump elements have difficulty meeting these requirements fulfill.
Bei der eingangs genannten Radialkolbenpumpe soll der Öffnungsvorgang des Saugventils dadurch unterstützt werden, daß der im Zylinderraum befindliche Schließkörper des Ventils im oberen Totpunkt des Pumpenkolbens von diesem weitgehend umschlossen ist und demzufolge der Kolben beim Saughub eine Saugwirkung auf den Schließkörper ausübt.In the radial piston pump mentioned at the outset Opening process of the suction valve can be supported that the closing body located in the cylinder chamber Valve at top dead center of the pump piston is largely enclosed and therefore the piston when Suction stroke exerts a suction effect on the closing body.
Die erfindungsgemäße Radialkolbenpumpe mit den Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß das Öffnen des Saugventils bei niedrigem Druck des zugeführten Kraftstoffs dadurch unterstützt wird, daß sich mit zunehmendem Saughub des Pumpenkolbens die Schließkraft der Ventilschließfeder verringert. Bei einer Mehrkolbenpumpe wird somit ein Öffnen aller Saugventile sicher erreicht und ein relativ hoher Grad an Gleichförderung erzielt. Deshalb ist eine Öffnungsdruckeinstellung der Saugventile entbehrlich oder mit verminderter Genauigkeit zulässig.The radial piston pump according to the invention with the features of Claim 1 has the advantage that the Open the suction valve at low pressure of the supplied Fuel is supported by the fact that increasing suction stroke of the pump piston the closing force of the Valve closing spring reduced. With a multi-piston pump an opening of all suction valves is thus reliably achieved and achieved a relatively high level of equal funding. Therefore is an opening pressure setting of the suction valves dispensable or permissible with reduced accuracy.
Zwar ist aus DE 44 06 803 A1 eine Radialkolbenpumpe mit axial durchströmten Pumpenkolben bekannt, in dem ein Saugventil angeordnet ist, dessen Ventilschließfeder einerseits am Schließkörper des Saugventils und andererseits am Pumpenkolben angreift. Beim Öffnen des Saugventils steigt jedoch mit zunehmendem Hub die Schließkraft der Feder an.A radial piston pump is included in DE 44 06 803 A1 axially flow-through pump piston known in the one Suction valve is arranged, the valve closing spring on the one hand on the closing body of the suction valve and on the other hand attacks the pump piston. When opening the suction valve rises however, the closing force of the spring increases with increasing stroke.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Patentanspruch 1 angegebenen Radialkolbenpumpe gegeben.By the measures listed in the subclaims advantageous developments and improvements in Claim 1 given radial piston pump.
Die im Anspruch 2 angegebene Maßnahme erlaubt es, die Baugröße der Radialkolbenpumpe zu verringern, da die Ventilschließfeder im wesentlichen innerhalb des Bauvolumens des Pumpenkolbens angeordnet ist. Durch diese Anordnung wird zugleich eine Führung der Ventilschließfeder erzielt.The measure specified in claim 2 allows the Reduce the size of the radial piston pump because the Valve closing spring essentially within the construction volume of the pump piston is arranged. This arrangement will also achieved guidance of the valve closing spring.
Mit der Ausgestaltung der Radialkolbenpumpe nach Anspruch 3 ist aufbauend auf die Maßnahme gemäß Anspruch 2 ebenfalls eine ausreichende Führung des Schließkörperschafts unter gleichzeitiger Verringerung des Totvolumens der Pumpe geschaffen.With the design of the radial piston pump according to claim 3 is also based on the measure according to claim 2 adequate guidance of the closing body shaft simultaneous reduction of the dead volume of the pump created.
Die Weiterbildung der Erfindung nach Anspruch 4 zeichnet aus durch unmittelbare Einleitung der Federkraft in die der Ventilsteuerung dienenden Bauteile. Deshalb wirken sich nur die Maßabweichungen weniger Bauteile auf die Einstellung des Saugventils aus.The development of the invention according to claim 4 is distinguished by direct introduction of the spring force into the Valve control components. Therefore only act the dimensional deviations of fewer components on the setting of the Suction valve off.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Radialkolbenpumpe im Schnitt und Figur 2 als Einzelheit II in Figur 1 ein Saugventil der Pumpe in größerem Maßstab.An embodiment of the invention is in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows a Radial piston pump in section and Figure 2 as detail II in Figure 1, a suction valve of the pump on a larger scale.
Eine in Figur 1 dargestellte, nicht verstellbare
Radialkolbenpumpe 10 ist für die
Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen
von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem,
vorgesehen. Die Radialkolbenpumpe 10 hat
ein Gehäuse 11, in dem eine Antriebswelle 12 mit einem
Exzenterabschnitt 13 gelagert ist. Auf dem Exzenterabschnitt
13 ist ein Hubring 14 geführt. In Figur 1 der Zeichnung ist
an dem Hubring 14 ein Kolbenfuß 15 eines bezüglich der
Antriebswelle 12 radial im Pumpengehäuse 11 längsbewegbar
geführten Pumpenkolbens 16 abgestützt. Der Kolbenfuß 15 ist
aufgrund der Wirkung einer achsgleich zum Pumpenkolben 16
angeordneten Kolbenfeder 17, welche einerseits am Kolbenfuß
15 und andererseits am Pumpengehäuse 11 angreift, stets in
Anlage am Hubring 14 gehalten. Dem Pumpenkolben 16 ist
ferner ein Saugventil 18 und ein Druckventil 19 zugeordnet.
Dem Saugventil 18 ist Kraftstoff, beispielsweise Dieselöl,
durch einen Kanal 20 des Pumpengehäuses 11 unter Niederdruck
zuführbar. Vom Druckventil 19 geht ein Kanal 21 des
Pumpengehäuses 11 aus, welcher vom Pumpenkolben 16
geförderten Kraftstoff unter Hochdruck ableitet. Der
Pumpenkolben 16 mit Kolbenfuß 15, Kolbenfeder 17, Saugventil
18 und Druckventil 19 bilden ein Pumpenelement 22 der
Radialkolbenpumpe 10. Diese ist mit weiteren, beispielsweise
insgesamt drei Pumpenelementen 22 ausgestattet, welche (in
der Zeichnung nicht sichtbar) um 120° gegeneinander versetzt
in einer Radialebene zur Achse der Antriebswelle 12 im
Pumpengehäuse 11 angeordnet sind. Die weiteren
Pumpenelemente 22 stehen gleichfalls mit den Kanälen 20 und
21 in Verbindung. Die nachfolgende Beschreibung des
Pumpenelements 22 anhand der Figur 2 gilt somit
gleichermaßen für die übrigen Pumpenelemente.A non-adjustable shown in Figure 1
Das Saugventil 18 ist bezüglich der Antriebswelle 12 radial
auf dem Pumpenkolben 16 folgend im Pumpengehäuse 11
angeordnet. Das Saugventil hat eine Ventilplatte 24, welche
in einer Bohrung 25 des Pumpengehäuses 11 mit einer
Verschlußschraube 26 niedergehalten ist. An der Ventilplatte
24 ist ein hohlkegelförmiger Ventilsitz 27 ausgebildet. Der
Ventilsitz 27 ist somit bezüglich des Gehäuses festliegend
angeordnet und steht mit dem Kraftstoff unter Niederdruck
führenden Kanal 20 in leitender Verbindung. Das Saugventil
18 besitzt einen Schließkörper 28 mit einem kegelförmigen
Ventilteller 29, welcher mit dem Ventilsitz 27 der
Ventilplatte 24 zusammenarbeitet. Bei geschlossenem
Saugventil 18 schließt der Ventilteller 29 des
Schließkörpers 28 etwa bündig mit der pumpenkolbenseitigen
Stirnfläche der Ventilplatte 24 ab.The
Der in einem Zylinderraum (Verdrängerraum) 32 des
Pumpengehäuses 11 angeordnete Pumpenkolben 16 weist eine als
Sacklochbohrung ausgebildete Längsbohrung 33 auf, welche in
einem ebenen Bohrungsgrund 34 endet. In der achsgleich zum
Pumpenkolben 16 angeordneten Längsbohrung 33 ist eine als
Schraubendruckfeder ausgebildete Ventilschließfeder 35
aufgenommen. Da sich der in Figur 2 in seiner oberen
Totpunktstellung befindliche Pumpenkolben 16 bis nahe an die
den Zylinderraum 22 begrenzende Ventilplatte 24 erstreckt,
befindet sich die Ventilschließfeder 35 zum überwiegenden
Teil ihrer Länge in der Längsbohrung 33 des Pumpenkolbens.
Die Ventilschließfeder 35 hat einen weitgehend dem
Durchmesser der Längsbohrung 33 des Pumpenkolbens 16
angepaßten Außendurchmesser und greift einerseits am
Bohrungsgrund 34 und andererseits am Ventilteller 29 an. Der
Schließkörper 28 des Saugventils 18 ist mit einem
stiftförmigen Schaft 36 versehen, welcher durch das Innere
der Ventilschließfeder 35 geführt ist und in der
gezeichneten Totpunktstellung des Pumpenkolbens 16 und
Schließstellung des Saugventils 18 bis nahe an den
Bohrungsgrund 34 reicht. Der mit seinem Außendurchmesser
nahezu dem Innendurchmesser der Ventilschließfeder 35
entsprechende Schaft 36 des Schließkörpers 28 ist über den
Ventilteller 29 hinaus um ein geringes Maß verlängert und in
der Ventilplatte 24 längsbewegbar geführt. Da der achsgleich
zum Pumpenkolben 16 verlaufende Schaft 36 des Schließkörpers
28 zusammen mit der Ventilschließfeder 35 weitgehend das
Volumen der Längsbohrung 33 des Pumpenkolbens 16 ausfüllen,
ist, wie Figur 2 zeigt, das Totvolumen der Pumpe gering. Wie
Figur 2 ebenfalls zeigt, ist der Zylinderraum 32
saugventilseitig im Durchmesser gegenüber dem Pumpenkolben
16 geringfügig vergrößert und steht in diesem vergrößerten
Abschnitt mit dem Druckventil 19 in Verbindung.The in a cylinder space (displacement space) 32
In der gezeichneten Stellung des Pumpenkolbens 16 übt die
Ventilschließfeder 35 eine maximale Schließkraft auf den
Ventilteller 29 des Saugventils 18 aus und hält dieses
geschlossen. Beim Saughub des Pumpenkolbens 16 wird dieser
aus der gezeichneten Stellung in Richtung auf den
Exzenterabschnitt 13 der Antriebswelle 12 bewegt. Dabei
erfährt die Ventilschließfeder 35 eine Verringerung ihrer
Schließkraft. Der durch den Kanal 20 dem Saugventil 18
zugeführte Kraftstoff unter Niederdruck übt eine der
Federkraft entgegengerichtete Öffnungskraft auf den
Ventilteller 29 aus. Bei Überwiegen der Öffnungskraft wird
das Saugventil 18 geöffnet, das heißt der Ventilteller 29
hebt vom Ventilsitz 27 ab und bewegt sich um ein geringes
Maß in den Zylinderraum 32 hinein. Das Öffnen des
Saugventils 18 erfolgt in Abhängigkeit vom Druck des
zugeführten Kraftstoffs: bei hohem Druck findet das Öffnen
des Saugventils 18 bereits bei geringem Saughub des
Pumpenkolbens 16 statt; bei niedrigem Druck wird das
Saugventil geöffnet, wenn der Pumpenkolben 16 einen größeren
Saughub zurückgelegt hat. Die Ventilschließfeder 35 ist
jedoch so ausgelegt, daß bei geringen Drücken des
zugeführten Kraftstoffs das Saugventil 18 bei großem Saughub
des Pumpenkolbens 16 sicher öffnet und eine Teilbefüllung
des Zylinderraums 32 erfolgt. Aufgrund des sichergestellten
Öffnens des Saugventils 18 ist in entsprechender Weise auch
die Teilbefüllung der übrigen Pumpenelemente 22 der
Radialkolbenpumpe 10 gegeben.In the drawn position of the
Claims (4)
- Radial piston pump (10) for producing high fuel pressure in fuel injection systems of internal combustion engines, in particular in a common-rail injection system, having a longitudinally movable, spring-loaded pump piston (16) in a cylinder space (32), which is connected to a suction valve (18) whose closing body (28), opening at least indirectly into the cylinder space (32), is loaded by a valve-closing spring (35) acting in the direction of its valve seat (27) fixed to the housing, characterized in that the valve-closing spring (35) is supported on the pump piston (16).
- Radial piston pump according to Claim 1, characterized in that the valve-closing spring (35) is designed as a helical compression spring and is accommodated over most of its length in a longitudinal bore (33) of the pump piston (16).
- Radial piston pump according to Claim 2, characterized in that a pin-shaped shank (36) of the closing body (28) is guided inside the valve-closing spring (35).
- Radial piston pump according to Claim 3, characterized in that the valve-closing spring (35) is supported with its one end on the bottom (34) of the longitudinal bore (39), designed as a blind hole, of the pump piston (16) and with its other end on a valve plate (29) of the closing body (28) of the suction valve (18), from which valve plate (29) the pin-shaped shank (36) of the closing body (28) starts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19848035 | 1998-10-17 | ||
| DE19848035A DE19848035A1 (en) | 1998-10-17 | 1998-10-17 | Radial piston pump for high fuel pressure in IC engines with common-rail injection system has suction valve closure spring supported on pump piston and contained in long piston bore |
| PCT/DE1999/001815 WO2000023711A1 (en) | 1998-10-17 | 1999-06-22 | Radial piston pump for supplying fuel at high pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1121531A1 EP1121531A1 (en) | 2001-08-08 |
| EP1121531B1 true EP1121531B1 (en) | 2003-01-22 |
Family
ID=7884881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99939926A Expired - Lifetime EP1121531B1 (en) | 1998-10-17 | 1999-06-22 | Radial piston pump for supplying fuel at high pressure |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6457957B1 (en) |
| EP (1) | EP1121531B1 (en) |
| JP (1) | JP4681119B2 (en) |
| DE (2) | DE19848035A1 (en) |
| WO (1) | WO2000023711A1 (en) |
Families Citing this family (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1310755B1 (en) | 1999-11-30 | 2002-02-22 | Elasis Sistema Ricerca Fiat | HIGH PRESSURE HYDRAULIC PUMP, IN PARTICULAR RUBBER PISTON PUMP FOR THE FUEL OF AN INTERNAL COMBUSTION ENGINE. |
| DE19959006C1 (en) | 1999-12-08 | 2000-12-21 | Bosch Gmbh Robert | Radial piston pump for common-rail fuel injection system for automobile engine has suction valve for one cylinder bore controlled in dependence on rotation angle of eccentric drive shaft |
| DE10117600C1 (en) * | 2001-04-07 | 2002-08-22 | Bosch Gmbh Robert | High-pressure fuel pump for a fuel system of a direct-injection internal combustion engine, fuel system and internal combustion engine |
| US6837694B2 (en) * | 2001-06-27 | 2005-01-04 | Unisia Jecs Corporation | Hydraulic pump unit with orifice plate for vehicle brake control system |
| KR100442379B1 (en) * | 2001-10-15 | 2004-07-30 | 엘지전자 주식회사 | Apparatus for sucking gas in linear compressor |
| DE10207043A1 (en) * | 2002-02-20 | 2003-08-21 | Bosch Gmbh Robert | Cap closure resisting extreme loading in engine fuel injection pump, has hard insert pressed-in to cause interlocking plastic deformation into annular groove |
| DE10218022A1 (en) | 2002-04-23 | 2003-11-06 | Bosch Gmbh Robert | Fuel injection device for an internal combustion engine |
| US6793471B2 (en) * | 2002-05-09 | 2004-09-21 | Sergei Latyshev | Fluid machine |
| DE10228551A1 (en) * | 2002-06-26 | 2004-01-22 | Siemens Ag | Radial piston pump |
| DE10228552B9 (en) * | 2002-06-26 | 2007-08-23 | Siemens Ag | Radial piston pump unit |
| DE10239728A1 (en) * | 2002-08-29 | 2004-03-11 | Robert Bosch Gmbh | Pump, in particular for a fuel injection device for an internal combustion engine |
| DE10243148A1 (en) * | 2002-09-17 | 2004-03-25 | Siemens Ag | Radial piston pump unit used in high-pressure injection systems for internal combustion engines, especially common rail injection systems, comprises a fuel-conveying pump with a spring-loaded low-pressure pump piston |
| DE10253189A1 (en) * | 2002-11-15 | 2004-05-27 | Robert Bosch Gmbh | Radial piston pump esp. for common rail fuel injection systems has flat seal in joint face between flange and housing to seal intake chamber against pump surroundings |
| DE10259178A1 (en) * | 2002-12-18 | 2004-07-08 | Robert Bosch Gmbh | High pressure pump for a fuel injection device of an internal combustion engine |
| DE102004023195B4 (en) * | 2004-05-11 | 2006-06-14 | Siemens Ag | Radial piston pump with balance weight |
| US7134846B2 (en) * | 2004-05-28 | 2006-11-14 | Stanadyne Corporation | Radial piston pump with eccentrically driven rolling actuation ring |
| DE102004028999A1 (en) * | 2004-06-16 | 2006-01-05 | Robert Bosch Gmbh | High-pressure pump for a fuel injection device of an internal combustion engine |
| DE102006017037B4 (en) | 2006-04-11 | 2015-09-17 | Continental Automotive Gmbh | Radial piston pump for high-pressure fuel supply in an internal combustion engine |
| DE102008064914B3 (en) * | 2007-03-29 | 2022-02-17 | Denso Corporation | hydraulic pump |
| JP2008248788A (en) * | 2007-03-30 | 2008-10-16 | Denso Corp | High pressure fuel pump |
| JP4318730B2 (en) * | 2007-03-29 | 2009-08-26 | 株式会社デンソー | High pressure fuel pump |
| JP5034705B2 (en) * | 2007-06-18 | 2012-09-26 | 株式会社アドヴィックス | Piston pump |
| US8287256B2 (en) * | 2007-11-01 | 2012-10-16 | Caterpillar Inc. | Valve assembly |
| DE102009002517A1 (en) | 2009-04-21 | 2010-10-28 | Robert Bosch Gmbh | Pump element, particularly plug-in pump for fuel injection system of air-compression-type, self-igniting internal combustion engine, has cylinder body and suction valve which is arranged in cylinder body |
| IT1397725B1 (en) * | 2009-12-22 | 2013-01-24 | Bosch Gmbh Robert | FUEL SUPPLY SYSTEM FROM A TANK TO AN INTERNAL COMBUSTION ENGINE. |
| CN103883452B (en) * | 2012-12-21 | 2016-03-30 | 北京亚新科天纬油泵油嘴股份有限公司 | The oil sucting valve assembly of high voltage common rail pump |
| ITMI20131952A1 (en) * | 2013-11-22 | 2015-05-23 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
| US10012228B2 (en) * | 2014-04-17 | 2018-07-03 | Danfoss Power Solutions Gmbh & Co. Ohg | Variable fluid flow hydraulic pump |
| GB2549746B (en) * | 2016-04-27 | 2020-04-01 | Delphi Tech Ip Ltd | High pressure fuel pump |
| GB2555599A (en) * | 2016-11-02 | 2018-05-09 | Delphi Int Operations Luxembourg Sarl | Fuel pump |
| DE102018204160A1 (en) * | 2018-03-19 | 2019-09-19 | Robert Bosch Gmbh | High-pressure pump and fuel delivery system for cryogenic fuels |
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|---|---|---|---|---|
| US2587421A (en) * | 1946-11-14 | 1952-02-26 | Jas P Marsh Corp | Release valve |
| GB1241793A (en) * | 1967-07-21 | 1971-08-04 | Colorflo Ltd | Improvements in or relating to printing apparatus |
| DE2333103A1 (en) * | 1973-06-29 | 1975-01-16 | Rexroth Gmbh G L | RADIAL PISTON MACHINE |
| DE2431938A1 (en) * | 1974-07-03 | 1976-01-22 | Bosch Gmbh Robert | Piston pump device with bore cut into piston - has sliding bolt in the axial piston aperture which slides under the influence of radial play |
| DE3710919C1 (en) * | 1987-04-01 | 1988-06-30 | Fluidtech Gmbh | Hydraulic single piston pump for manual operation |
| IT1261556B (en) * | 1992-04-27 | 1996-05-23 | Elasis Sistema Ricerca Fiat | RADIAL PISTON PUMP, IN PARTICULAR FOR THE FUEL OF INTERNAL COMBUSTION ENGINES. |
| DE59402095D1 (en) * | 1993-07-23 | 1997-04-17 | Teves Gmbh Alfred | HYDRAULIC BRAKE SYSTEM WITH BRAKE-SLIP AND DRIVE-SLIP CONTROL |
| DE4425402A1 (en) * | 1993-08-06 | 1996-04-04 | Teves Gmbh Alfred | Hydraulic pump for hydraulic brake system |
-
1998
- 1998-10-17 DE DE19848035A patent/DE19848035A1/en not_active Withdrawn
-
1999
- 1999-06-22 US US09/807,407 patent/US6457957B1/en not_active Expired - Fee Related
- 1999-06-22 EP EP99939926A patent/EP1121531B1/en not_active Expired - Lifetime
- 1999-06-22 WO PCT/DE1999/001815 patent/WO2000023711A1/en active IP Right Grant
- 1999-06-22 JP JP2000577409A patent/JP4681119B2/en not_active Expired - Fee Related
- 1999-06-22 DE DE59904114T patent/DE59904114D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US6457957B1 (en) | 2002-10-01 |
| JP2003527516A (en) | 2003-09-16 |
| JP4681119B2 (en) | 2011-05-11 |
| EP1121531A1 (en) | 2001-08-08 |
| DE59904114D1 (en) | 2003-02-27 |
| WO2000023711A1 (en) | 2000-04-27 |
| DE19848035A1 (en) | 2000-04-20 |
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