EP1247983A1 - Piston pump for hydraulic systems - Google Patents

Piston pump for hydraulic systems Download PDF

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Publication number
EP1247983A1
EP1247983A1 EP01108795A EP01108795A EP1247983A1 EP 1247983 A1 EP1247983 A1 EP 1247983A1 EP 01108795 A EP01108795 A EP 01108795A EP 01108795 A EP01108795 A EP 01108795A EP 1247983 A1 EP1247983 A1 EP 1247983A1
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EP
European Patent Office
Prior art keywords
piston
pump
pressure
pressure control
check valve
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Granted
Application number
EP01108795A
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German (de)
French (fr)
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EP1247983B1 (en
Inventor
Guenter Bartsch
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to EP01108795A priority Critical patent/EP1247983B1/en
Priority to DE50108826T priority patent/DE50108826D1/en
Priority to US10/063,169 priority patent/US6676389B2/en
Publication of EP1247983A1 publication Critical patent/EP1247983A1/en
Application granted granted Critical
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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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/16—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by adjusting the capacity of dead spaces of working chambers

Definitions

  • the invention relates to a piston pump containing one Delivery piston, a pressure relief piston, a return spring, one Pressure control spring and two check valves, preferably suitable for this sufficient hydraulic pressure to operate a variable To ensure valve control in reciprocating internal combustion engines.
  • a variable valve control for reciprocating internal combustion engines is known from EP 1 046 793.
  • the existing lubricant pump Lubricant flow generated is used at the end of the camshaft adjustment device located between the drive wheel and the camshaft actuate, which in turn causes a phase shift of the camshaft.
  • the adjustment devices mentioned are usually supplied by Bores in the camshaft, with the control of the lubricant flow generally done by solenoid valves.
  • This known device has the disadvantage that at low Speeds of the reciprocating piston internal combustion engine, the amount of lubricant sufficient, but the lubricant pressure is usually too low to Actuating devices or the actuation is too slow.
  • This known disadvantage has so far been compensated for by the fact that a Lubricant pump with increased delivery capacity is installed. This leads to however, very high power consumption of the pump at higher speeds the reciprocating internal combustion engine, which is undesirable, however, because it is the Efficiency reduced.
  • two-stage or variable pumps used which has sufficient lubricant pressure at low speeds ensure, however, a not so high power consumption at high Have speeds. However, these pumps are very expensive.
  • a pump of the type mentioned at the outset is known from EP 0 976 926. she serves a liquid medium such. B. to promote fuel and / or pressure to increase.
  • a cam drives one directly or by means of a push rod Piston on, which can move up and down in a cylindrical bore.
  • the piston moves upwards, the fluid flows through the Output channel off while simultaneously through a liquid check valve reaches the second side of the piston.
  • the downward movement of the piston lets the liquid through while the first check valve closes flow a second check valve into the cylinder.
  • a disadvantage of the type of pump described is that it is often very high Liquid pressures can be achieved in the above application are also a hindrance.
  • the object of the present invention is a Booster pump to improve so that it is approximately constant fluid pressure for the supply of the Guaranteed camshaft adjustment devices and at the same time the Disadvantages of the known solutions, high costs or high Power consumption, avoids, with a small footprint.
  • the cylinder head of a reciprocating piston internal combustion engine contains at least one Camshaft provided with a known camshaft adjusting device is.
  • the cylinder head contains a Housing in which the individual parts of the booster pump are housed are.
  • This housing can be an integral part of the cylinder head or can be fitted as a separate part.
  • Transfer piston in a known manner directly or by means of a plunger already existing cams of the engine valve control or advantageous from an additional cam located on the camshaft is driven.
  • the transfer piston is designed as a hollow part with a fluid drainage and transverse at the cam end Pressure compensation hole. The transfer piston is closed on the cam side and abuts the camshaft while the opposite end is open.
  • the open end of the transfer piston is closed by the Pressure control piston against the pressure control piston spring a circlip embedded in a groove in the transfer piston is pressed.
  • Other components of the pump are also a compression spring, which in known way leads the transfer piston non-positively on the cam and one or two check valves. This opens in an advantageous way Design of the pressure spring held check valve during the Suction strokes to the inlet duct integrated into the housing during this second check valve on the side when the desired one is reached Delivery pressure releases liquid into the pressure channel.
  • An advantageous embodiment of the present invention is that all parts belonging to the booster pump pre-assembled in one insert be, so that a simple assembly of the pump is possible.
  • the housing 3 contains a fluid inlet channel 5, which in a known manner during the operation of a reciprocating piston internal combustion engine with lubricant is acted upon, a fluid drainage channel or delivery channel 6 and one Bore 7, the individual parts of the booster pump or a sleeve 17th (containing the booster pump shown here).
  • a transfer piston 8 is in the bore 7 or, as shown here, in the sleeve 17 mounted displaceably, with a likewise in the transfer piston 8 displaceably mounted pressure control piston 9 and a Pressure control spring 10, both held by a locking ring 11, arranged are.
  • the pressure control spring 10, shown here, can also be any other type from the energy store that fulfills the function.
  • the transfer piston 8 is in turn by a disc 12 by a second Compression spring 13 pressed against the cam of the camshaft 4, so that a constant frictional contact between the transfer piston and cam is guaranteed.
  • the spring strength of the compression spring should be as small as possible to keep the required drive power for the pump low.
  • the compression spring 13 also holds a check valve 14 in position.
  • the check valve 14 serves the lubricant in one Displacement 16 let in while the check valve 15 as Exhaust valve is provided.
  • the Transfer piston 8 (containing the pressure control spring 10 and Pressure control piston 9 secured by the circlip 11), the disc 12, the Compression spring 13 and the inlet check valve 14 mounted in a sleeve 17 and secured by a second locking ring 18, the sleeve 17 on the Camshaft side for receiving the transfer piston 8 is open and on the Lubricant inlet side a sufficiently large bore to fill the Pump through the inlet check valve 14 has.
  • the outlet pressure should have a certain desired value do not exceed. This value is determined by the stiffness of the pressure control spring and the area of the pressure control piston. Now becomes the one you want Output pressure reached during the cam stroke, the Pressure control spring compressed and no further pressure increase takes place instead of.
  • the desired pressure for the Camshaft adjustment device may still be on additional pressure relief valve (not shown here) either in inlet channel 5 or to be provided in the delivery channel 6.
  • the invention thus shows a device for increasing the pressure in fluids which low material consumption and extremely low installation effort in almost all common housing of the type mentioned above can be brought in to the Pressure supply to the camshaft adjustment device as required increase.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Piston pump for fluids, especially for lubricating oil in lifting piston combustion engines with a transfer piston (8), an inlet non-return valve (14) and an outlet non-return valve (15). A pressure control piston (9) is arranged with the transfer piston. The pressure control piston is retained by a pressure control spring (10) so that it is moveable within the transfer piston.

Description

Die Erfindung bezieht sich auf eine Kolbenpumpe, enthaltend einen Förderkolben, einen Druckbegrenzerkolben, eine Rückholfeder, eine Druckkontrollfeder sowie zwei Rückschlagventile, vorzugsweise dazu geeignet einen ausreichenden Hydraulikdruck zur Betätigung einer variablen Ventilsteuerung bei Hubkolbenbrennkraftmaschinen zu gewährleisten.The invention relates to a piston pump containing one Delivery piston, a pressure relief piston, a return spring, one Pressure control spring and two check valves, preferably suitable for this sufficient hydraulic pressure to operate a variable To ensure valve control in reciprocating internal combustion engines.

Eine variable Ventilsteuerungen für Hubkolbenbrennkraftmaschinen ist bekannt aus der EP 1 046 793. Dabei wird der von der vorhandenen Schmierstoffpumpe erzeugte Schmierstoffstrom dazu benutzt, eine sich am Ende der Nockenwelle zwischen Treibrad und Nockenwelle befindlichen Verstelleinrichtung zu betätigen, die wiederum eine Phasenverschiebung der Nockenwelle bewirkt. Versorgt werden die genannten Verstelleinrichtungen in der Regel durch Bohrungen in der Nockenwelle, wobei die Steuerung des Schmierstoffstromes im allgemeinen durch Magnetventile erfolgt.A variable valve control for reciprocating internal combustion engines is known from EP 1 046 793. In this case, the existing lubricant pump Lubricant flow generated is used at the end of the camshaft adjustment device located between the drive wheel and the camshaft actuate, which in turn causes a phase shift of the camshaft. The adjustment devices mentioned are usually supplied by Bores in the camshaft, with the control of the lubricant flow generally done by solenoid valves.

Diese bekannte Einrichtung weist den Nachteil auf, daß bei niedrigen Drehzahlen der Hubkolbenbrennkraftmaschine die Schmierstoffmenge zwar ausreicht, der Schmierstoffdruck in der Regel aber zu gering ist, um die Verstelleinrichtungen zu betätigen oder aber die Betätigung erfolgt zu langsam. Dieser bekannte Nachteil wird bisher dadurch kompensiert, daß eine Schmierstoffpumpe mit erhöhter Förderkapazität eingebaut wird. Dies führt jedoch zu sehr hoher Leistungsaufnahme der Pumpe bei höheren Drehzahlen der Hubkolbenbrennkraftmaschine, die jedoch unerwünscht ist, da sie den Wirkungsgrad herabsetzt. Alternativ werden Zweistufen oder variable Pumpen eingesetzt, die einen ausreichenden Schmierstoffdruck bei niedrigen Drehzahlen sicherstellen, jedoch eine nicht so hohe Leistungsaufnahme bei hohen Drehzahlen aufweisen. Allerdings sind diese Pumpen sehr kostenintensiv.This known device has the disadvantage that at low Speeds of the reciprocating piston internal combustion engine, the amount of lubricant sufficient, but the lubricant pressure is usually too low to Actuating devices or the actuation is too slow. This known disadvantage has so far been compensated for by the fact that a Lubricant pump with increased delivery capacity is installed. this leads to however, very high power consumption of the pump at higher speeds the reciprocating internal combustion engine, which is undesirable, however, because it is the Efficiency reduced. Alternatively, two-stage or variable pumps used which has sufficient lubricant pressure at low speeds ensure, however, a not so high power consumption at high Have speeds. However, these pumps are very expensive.

Eine Pumpe der eingangs genannten Art ist aus der EP 0 976 926 bekannt. Sie dient dazu ein flüssiges Medium z. B. Kraftstoff zu fördern und/oder den Druck zu erhöhen. Dazu treibt ein Nocken direkt oder mittels Stößelstange einen Kolben an, der sich in einer zylindrischen Bohrung auf und ab bewegen kann. Bei der Aufwärtsbewegung des Kolbens strömt das Fluid durch den Ausgangskanal aus, während gleichzeitig durch ein Rückschlagventil Flüssigkeit auf die zweite Seite des Kolbens gelangt. Die Abwärtsbewegung des Kolbens läßt die Flüssigkeit, während das erstgenannte Rückschlagventil schließt, durch ein zweites Rückschlagventil in den Zylinder strömen.A pump of the type mentioned at the outset is known from EP 0 976 926. she serves a liquid medium such. B. to promote fuel and / or pressure to increase. For this purpose, a cam drives one directly or by means of a push rod Piston on, which can move up and down in a cylindrical bore. When the piston moves upwards, the fluid flows through the Output channel off while simultaneously through a liquid check valve reaches the second side of the piston. The downward movement of the piston lets the liquid through while the first check valve closes flow a second check valve into the cylinder.

Nachteilig ist bei der beschriebenen Pumpenart, daß oft sehr hohe Flüssigkeitsdrücke erreicht werden, die in der oben genannten Anwendung ebenfalls hinderlich sind.A disadvantage of the type of pump described is that it is often very high Liquid pressures can be achieved in the above application are also a hindrance.

Vor diesem Hintergrund ist die Aufgabe der vorliegenden Erfindung, eine Druckerhöhungspumpe derart zu verbessern, daß sie einen annähernd gleichbleibenden Flüssigkeitsdruck für die Versorgung der Nockenwellenverstelleinrichtungen gewährleistet und dabei gleichzeitig die Nachteile der bekannten Lösungen, hohe Kosten bzw. hohe Leistungsaufnahme, vermeidet, bei geringem Platzbedarf.Against this background, the object of the present invention is a Booster pump to improve so that it is approximately constant fluid pressure for the supply of the Guaranteed camshaft adjustment devices and at the same time the Disadvantages of the known solutions, high costs or high Power consumption, avoids, with a small footprint.

Diese Aufgabe wird durch eine Druckerhöhungspumpe mit den Merkmalen des Anspruches 1 gelöst. Eine vorteilhafte Ausgestaltung ist in dem Unteranspruch enthalten.This task is carried out by a booster pump with the characteristics of Claim 1 solved. An advantageous embodiment is in the subclaim contain.

Der Zylinderkopf einer Hubkolbenbrennkraftmaschine enthält mindestens eine Nockenwelle, die mit einer bekannten Nockenwellenverstelleinrichtung versehen ist. In der hier gezeigten vorteilhaften Ausgestaltung enthält der Zylinderkopf ein Gehäuse in welchem die Einzelteile der Druckerhöhungspumpe untergebracht sind. Dieses Gehäuse kann integraler Bestandteil des Zylinderkopfes sein oder als separates Teil geeignet montiert werden. Im Gehäuse befindet sich ein Transferkolben der in bekannter Weise direkt oder mittels Stößel von einem bereits vorhandenen Nocken der Motorventilsteuerung oder vorteilhaft von einem zusätzlichen auf der Nockenwelle befindlichen Nocken angetrieben wird. In einer vorteilhaften Ausführung ist der Transferkolben als Hohlteil ausgeführt mit einer am nockenseitigen Ende querliegenden Fluidablauf- und Druckausgleichsbohrung. Der Transferkolben ist nockenseitig geschlossen und liegt an der Nockenwelle an, während das entgegengesetzte Ende offen ist. Das offene Ende des Transferkolbens wird verschlossen durch den Druckkontrollkolben der seinerseits von der Druckkontrollkolbenfeder gegen einen in eine Nut im Transferkolben eingelassenen Sicherungsring gepreßt wird. Weitere Bestandteile der Pumpe sind außerdem eine Druckfeder, die in bekannter Weise den Transferkolben kraftschlüssig auf der Nocke führt sowie ein bis zwei Rückschlagventile. Dabei öffnet das in einer vorteilhaften Ausgestaltung von der Druckfeder gehaltene Rückschlagventil während des Saughubes zum in das Gehäuse integrierten Einlaßkanal während das hier seitlich angebrachte zweite Rückschlagventil bei Erreichen des gewünschten Förderdruckes Flüssigkeit in den Druckkanal entläßt.The cylinder head of a reciprocating piston internal combustion engine contains at least one Camshaft provided with a known camshaft adjusting device is. In the advantageous embodiment shown here, the cylinder head contains a Housing in which the individual parts of the booster pump are housed are. This housing can be an integral part of the cylinder head or can be fitted as a separate part. There is a in the housing Transfer piston in a known manner directly or by means of a plunger already existing cams of the engine valve control or advantageous from an additional cam located on the camshaft is driven. In an advantageous embodiment, the transfer piston is designed as a hollow part with a fluid drainage and transverse at the cam end Pressure compensation hole. The transfer piston is closed on the cam side and abuts the camshaft while the opposite end is open. The open end of the transfer piston is closed by the Pressure control piston against the pressure control piston spring a circlip embedded in a groove in the transfer piston is pressed. Other components of the pump are also a compression spring, which in known way leads the transfer piston non-positively on the cam and one or two check valves. This opens in an advantageous way Design of the pressure spring held check valve during the Suction strokes to the inlet duct integrated into the housing during this second check valve on the side when the desired one is reached Delivery pressure releases liquid into the pressure channel.

Eine vorteilhafte Ausgestaltung der vorliegenden Erfindung besteht darin, daß alle zur Druckerhöhungspumpe gehörenden Teile in einem Einsatz vormontiert werden, so daß eine einfache Montage der Pumpe möglich ist.An advantageous embodiment of the present invention is that all parts belonging to the booster pump pre-assembled in one insert be, so that a simple assembly of the pump is possible.

Die Erfindung wird anhand des in der beiliegenden Zeichnung gezeigten Ausführungsbeispieles näher erläutert. Es zeigt

Fig. 1
einen schematischen Vertikalschnitt durch einen Zylinderkopf eines Kraftfahrzeuges mit der erfindungsgemäßen Druckerhöhungspumpe;
In Figur 1 ist eine erfindungsgemäße Kolbenpumpe 1 im Vertikalschnitt dargestellt. Zu erkennen ist, daß die Kolbenpumpe 1 in ein Gehäuse 3 montiert ist, welches wiederum mit dem Zylinderkopf 2 einer Hubkolbenbrennkraftmaschine verbunden ist. Außerdem gezeigt ist eine Nockenwelle 4, die im Zylinderkopf 3 in bekannter Weise gelagert ist.The invention is explained in more detail using the exemplary embodiment shown in the accompanying drawing. It shows
Fig. 1
a schematic vertical section through a cylinder head of a motor vehicle with the booster pump according to the invention;
A piston pump 1 according to the invention is shown in vertical section in FIG. It can be seen that the piston pump 1 is mounted in a housing 3, which in turn is connected to the cylinder head 2 of a reciprocating piston internal combustion engine. Also shown is a camshaft 4, which is mounted in the cylinder head 3 in a known manner.

Das Gehäuse 3 enthält einen Fluidzulaufkanal 5, der in bekannter Weise während des Betriebes einer Hubkolbenbrennkraftmaschine mit Schmiermittel beaufschlagt wird, einen Fluidablaufkanal oder Förderkanal 6 sowie eine Bohrung 7, die die Einzelteile der Druckerhöhungspumpe oder eine Hülse 17 (enthaltend die Druckerhöhungspumpe, hier gezeigt) aufnimmt.The housing 3 contains a fluid inlet channel 5, which in a known manner during the operation of a reciprocating piston internal combustion engine with lubricant is acted upon, a fluid drainage channel or delivery channel 6 and one Bore 7, the individual parts of the booster pump or a sleeve 17th (containing the booster pump shown here).

In der Bohrung 7 bzw. wie hier gezeigt in der Hülse 17 ist ein Transferkolben 8 verschiebebeweglich gelagert, wobei in dem Transferkolben 8 ein ebenfalls verschiebebeweglich gelagerten Druckkontrollkolben 9 und eine Druckkontrollfeder 10, beide gehalten von einem Sicherungsring 11, angeordnet sind. Die Druckkontrollfeder 10, hier gezeigt, kann aber auch jede andere Art von Kraftspeicher sein, der die Funktion erfüllt.A transfer piston 8 is in the bore 7 or, as shown here, in the sleeve 17 mounted displaceably, with a likewise in the transfer piston 8 displaceably mounted pressure control piston 9 and a Pressure control spring 10, both held by a locking ring 11, arranged are. The pressure control spring 10, shown here, can also be any other type from the energy store that fulfills the function.

Der Transferkolben 8 wiederum wird über eine Scheibe 12 von einer zweiten Druckfeder 13 an die Nocke der Nockenwelle 4 gepreßt, so daß ein ständiger kraftschlüssiger Kontakt zwischen Transferkolben und Nocke gewährleistet ist. Andererseits sollte die Federstärke der Druckfeder möglichst gering gewählt werden, um die erforderliche Antriebsleistung für die Pumpe gering zu halten. In der hier gezeigten Version hält die Druckfeder 13 zusätzlich ein Rückschlagventil 14 in Position. Zusätzlich befindet sich im Gehäuse ein zweites Rückschlagventil 15. Das Rückschlagventil 14 dient dazu das Schmiermittel in einen Verdrängungsraum 16 einzulassen, während das Rückschlagventil 15 als Auslaßventil vorgesehen ist.The transfer piston 8 is in turn by a disc 12 by a second Compression spring 13 pressed against the cam of the camshaft 4, so that a constant frictional contact between the transfer piston and cam is guaranteed. On the other hand, the spring strength of the compression spring should be as small as possible to keep the required drive power for the pump low. In In the version shown here, the compression spring 13 also holds a check valve 14 in position. There is also a second check valve in the housing 15. The check valve 14 serves the lubricant in one Displacement 16 let in while the check valve 15 as Exhaust valve is provided.

In der hier gezeigten vorteilhaften Ausgestaltung der Erfindung befinden sich der Transferkolben 8 (enthaltend die Druckkontrollfeder 10 und den Druckkontrollkolben 9 gesichert vom Sicherungsring 11), die Scheibe 12, die Druckfeder 13 und das Einlaßrückschlagventil 14 montiert in einer Hülse 17 und gesichert durch einen zweiten Sicherungsring 18, wobei die Hülse 17 auf der Nockenwellenseite zur Aufnahme des Transferkolbens 8 geöffnet ist und auf der Schmiermitteleinlaßseite eine ausreichend große Bohrung zur Befüllung der Pumpe durch das Einlaßrückschlagventil 14 besitzt.In the advantageous embodiment of the invention shown here are the Transfer piston 8 (containing the pressure control spring 10 and Pressure control piston 9 secured by the circlip 11), the disc 12, the Compression spring 13 and the inlet check valve 14 mounted in a sleeve 17 and secured by a second locking ring 18, the sleeve 17 on the Camshaft side for receiving the transfer piston 8 is open and on the Lubricant inlet side a sufficiently large bore to fill the Pump through the inlet check valve 14 has.

Während des Betriebes einer Hubkolbenbrennkraftmaschine fördert die vorhandene Schmiermittelpumpe Schmiermittel in den Einlaßkanal 5 der Druckerhöhungspumpe. Durch das Rückschlagventil 14 gelangt das Schmiermittel in den Verdrängungsraum 16 gebildet durch den Raum zwischen dem Transferkolben 8, Bohrung 7, dem Einlaßrückschlagventventil 14 und dem Auslaßrückschlagventil 15. Dreht sich nun die Nockenwelle 4 aus der in Fig. 1 gezeigten Position um 90° in die durch Pfeil markierte Drehrichtung wird der Transferkolben 8 in der Bohrung 7 bzw. der Hülse 17 in Richtung Einlaßkanal 5 gedrückt. Gleichzeitig schließt das Einlaßrückschlagventil 14. Durch die Bewegung der Kolben wird das Fluid verdrängt und auf Grund dessen durch den Auslaßkanal 6 und das Auslaßrückschlagventil 15 zu dem oder den Verbrauchern (Nockenwellenverstelleinrichtung) befördert.The promotes during the operation of a reciprocating piston internal combustion engine existing lubricant pump lubricant in the inlet channel 5 of the Booster pump. Through the check valve 14 passes Lubricant in the displacement space 16 formed by the space between the transfer piston 8, bore 7, the inlet check valve 14 and the Exhaust check valve 15. The camshaft 4 now rotates from that in FIG. 1 shown position by 90 ° in the direction of rotation indicated by the arrow Transfer piston 8 in bore 7 or sleeve 17 in the direction of inlet duct 5 pressed. At the same time, the inlet check valve 14 closes Movement of the pistons displaces the fluid and therefore by the Outlet channel 6 and the outlet check valve 15 to the or Conveyed consumers (camshaft adjustment device).

Erfindungsgemäß soll der Ausgangsdruck einen bestimmten gewünschten Wert nicht überschreiten. Dieser Wert wird durch die Steifigkeit der Druckkontrollfeder und der Fläche des Druckkontrollkolbens bestimmt. Wird nun der gewünschte Ausgangsdruck während des Nockenhubes erreicht, so wird die Druckkontrollfeder komprimiert und eine weitere Druckerhöhung findet nicht statt.According to the invention, the outlet pressure should have a certain desired value do not exceed. This value is determined by the stiffness of the pressure control spring and the area of the pressure control piston. Now becomes the one you want Output pressure reached during the cam stroke, the Pressure control spring compressed and no further pressure increase takes place instead of.

Für den Fall, daß der Eingangsdruck bereits auf dem Niveau des gewünschten Ausgangsdruckes liegt oder kein Fluidbedarf durch den oder die Verbraucher besteht, fördert die Pumpe näherungsweise kein Fluid. Der Druckkontrollkolben verharrt in einer Position und die Nockenwelle verrichtet Arbeit nur gegen die Druckkontrollfeder. In the event that the inlet pressure is already at the desired level Output pressure is or no fluid requirement by the consumer or consumers there is approximately no fluid in the pump. The pressure control piston remains in one position and the camshaft only does work against it Pressure control spring.

Sollte der Förderdruck des Schmierstoffes durch die serienmäßige Förderpumpe einer Hubkolbenbrennkraftmaschine den gewünschten Druck für die Nockenwellenverstelleinrichtung überschreiten, ist eventuell noch ein zusätzliches Überdruckventil (hier nicht gezeigt) entweder im Zulaufkanal 5 oder im Förderkanal 6 vorzusehen.If the delivery pressure of the lubricant is through the standard delivery pump a reciprocating internal combustion engine the desired pressure for the Camshaft adjustment device may still be on additional pressure relief valve (not shown here) either in inlet channel 5 or to be provided in the delivery channel 6.

Dreht sich die Nockenwelle weiter auf die 180° Position bewegen sich der Transferkolben 8 und der Druckkontrollkolben 9 kraftschlüssig geführt durch die Druckfeder 13 in Richtung Nockenwelle 4 und vergrößern den Verdrängungsraum 16. Dadurch entsteht ein Saugdruck, das Ventil 14 öffnet und das Ventil 15 schließt.If the camshaft continues to rotate to the 180 ° position, the Transfer piston 8 and the pressure control piston 9 non-positively guided through the Compression spring 13 in the direction of the camshaft 4 and enlarge the Displacement space 16. This creates a suction pressure that opens valve 14 and the valve 15 closes.

Bewegt sich die Nockenwelle weiter auf 360° beginnt der nächste Pumpzyklus.If the camshaft continues to move through 360 °, the next pump cycle begins.

Die Erfindung zeigt somit eine Einrichtung zur Druckerhöhung in Fluiden, die bei geringem Materialaufwand und äußerst geringem Montageaufwand in fast alle gängige Gehäuse der oben genannten Art einbringbar ist, um dort die Druckversorgung der Nockenwellenverstelleinrichtung bedarfsgerecht zu erhöhen.The invention thus shows a device for increasing the pressure in fluids which low material consumption and extremely low installation effort in almost all common housing of the type mentioned above can be brought in to the Pressure supply to the camshaft adjustment device as required increase.

Claims (2)

Kolbenpumpe (1) für Flüssigkeiten, vor allem für Schmiermittel in Hubkolbenbrennkraftmaschinen, mit einem Transferkolben (8), sowie einem Einlaßrückschlagventil (14) und einem Auslaßrückschlagventil (15)
dadurch gekennzeichnet, daß
   im Transferkolben (8) ein Druckkontrollkolben (9) verschiebbar angeordnet ist, der von einer Druckkontrollfeder (10) gehalten wird.Piston pump (1) for liquids, especially for lubricants in reciprocating piston internal combustion engines, with a transfer piston (8), as well as an inlet check valve (14) and an outlet check valve (15)
characterized in that
A pressure control piston (9), which is held by a pressure control spring (10), is displaceably arranged in the transfer piston (8). Kolbenpumpe für Flüssigkeiten nach Anspruch 1, vor allem für Schmiermittel in Hubkolbenbrennkraftmaschinen,
dadurch gekennzeichnet, daß
   die Kolbenpumpe (1) in einer Hülse (17) gehalten von einem Sicherungsring (18) vormontiert ist.Piston pump for liquids according to claim 1, especially for lubricants in reciprocating piston internal combustion engines,
characterized in that
the piston pump (1) is pre-assembled in a sleeve (17) held by a locking ring (18).
EP01108795A 2001-04-07 2001-04-07 Piston pump for hydraulic systems Expired - Lifetime EP1247983B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01108795A EP1247983B1 (en) 2001-04-07 2001-04-07 Piston pump for hydraulic systems
DE50108826T DE50108826D1 (en) 2001-04-07 2001-04-07 Piston pump for hydraulic systems
US10/063,169 US6676389B2 (en) 2001-04-07 2002-03-27 Piston pump for increasing pressure, comprising a transfer piston and a pressure-control piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01108795A EP1247983B1 (en) 2001-04-07 2001-04-07 Piston pump for hydraulic systems

Publications (2)

Publication Number Publication Date
EP1247983A1 true EP1247983A1 (en) 2002-10-09
EP1247983B1 EP1247983B1 (en) 2006-02-01

Family

ID=8177088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01108795A Expired - Lifetime EP1247983B1 (en) 2001-04-07 2001-04-07 Piston pump for hydraulic systems

Country Status (3)

Country Link
US (1) US6676389B2 (en)
EP (1) EP1247983B1 (en)
DE (1) DE50108826D1 (en)

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DE102010041310A1 (en) * 2010-09-24 2012-03-29 Robert Bosch Gmbh Pump and method for its production
DE102013016030A1 (en) * 2013-09-26 2015-03-26 Hydac System Gmbh Conveyor
US11033943B2 (en) * 2017-09-13 2021-06-15 Ford Motor Company Mechanical applicator for use in stamping die process to apply thermo-chromatic ink to aluminum heat treated panels
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FR2210722A1 (en) * 1973-11-26 1974-07-12 Poclain Sa
DE19820902A1 (en) * 1998-05-09 1999-11-11 Bosch Gmbh Robert Piston pump for a vehicle hydraulic brake system

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DE10354599A1 (en) * 2003-11-21 2005-06-16 Zf Friedrichshafen Ag Radial piston pump has damping piston with its own compression spring which has lower spring rigidity than return spring for feed piston, with compression spring for damping piston fitted concentrically to return spring

Also Published As

Publication number Publication date
US6676389B2 (en) 2004-01-13
US20020146337A1 (en) 2002-10-10
EP1247983B1 (en) 2006-02-01
DE50108826D1 (en) 2006-04-13

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