EP1247983B1 - Piston pump for hydraulic systems - Google Patents
Piston pump for hydraulic systems Download PDFInfo
- Publication number
- EP1247983B1 EP1247983B1 EP01108795A EP01108795A EP1247983B1 EP 1247983 B1 EP1247983 B1 EP 1247983B1 EP 01108795 A EP01108795 A EP 01108795A EP 01108795 A EP01108795 A EP 01108795A EP 1247983 B1 EP1247983 B1 EP 1247983B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- pump
- pressure control
- return valve
- piston pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000314 lubricant Substances 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Images
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
- 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 according to the preamble of claim 1.
- Such a piston pump is known from FR 2 157 546 A.
- a variable valve control for reciprocating internal combustion engines is known from EP 1 046 793.
- the lubricant flow generated by the existing lubricant pump is used to actuate a located at the end of the camshaft between the drive wheel and camshaft adjustment, which in turn causes a phase shift of the camshaft.
- the said adjusting devices are usually supplied by bores in the camshaft, wherein the control of the lubricant flow is generally carried out by solenoid valves.
- This known device has the disadvantage that at low speeds of the reciprocating internal combustion engine, the lubricant quantity is indeed sufficient, but the lubricant pressure is usually too low to operate the adjustment or the operation is too slow.
- This known disadvantage has been compensated by the fact that a lubricant pump with increased delivery capacity is installed. However, this leads to very high power consumption of the pump at higher speeds of the reciprocating internal combustion engine, which is undesirable because it reduces the efficiency.
- two-stage or variable pumps are used which provide sufficient lubricant pressure at low speeds but not so high power consumption at high speeds. However, these pumps are very expensive.
- Another pump is known from EP 0 976 926. It serves to a liquid medium z. B. to promote fuel and / or to increase the pressure.
- a cam directly or by means of push rod drives a piston which can move up and down in a cylindrical bore.
- the fluid flows through the outlet channel, while at the same time passes through a check valve liquid on the second side of the piston.
- the cylinder head of a reciprocating internal combustion engine includes at least one camshaft provided with a known camshaft adjusting device.
- the cylinder head contains a housing in which housed the items of the booster pump are.
- This housing can be an integral part of the cylinder head or mounted as a separate part suitable.
- a transfer piston which is driven in a known manner directly or by means of plunger of an existing cam of the engine valve control or advantageously by an additional located on the camshaft cam.
- the transfer piston is designed as a hollow part with a transverse to the cam end fluid drain and pressure equalization hole. The transfer piston is closed on the cam side and bears against the camshaft, while the opposite end is open.
- the open end of the transfer piston is closed by the pressure control piston, which in turn is pressed by the pressure control piston spring against an inserted into a groove in the transfer piston circlip.
- Other components of the pump are also a compression spring, the transfer piston in a known manner non-positively on the cam and one to two check valves.
- the non-return valve held in an advantageous embodiment of the compression spring opens during the suction stroke to the inlet channel integrated into the housing while the laterally attached second check valve releases liquid into the pressure channel upon reaching the desired delivery pressure.
- FIG. 1 shows a vertical section of a piston pump 1 according to the invention. 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 internal combustion engine. Also shown is a camshaft 4, which is mounted in the cylinder head 3 in a known manner.
- the housing 3 includes a fluid inlet channel 5, which is lubricated in a known manner during operation of a reciprocating internal combustion engine, a fluid drain channel or delivery channel 6 and a bore 7, which receives the components of the booster pump or a sleeve 17 (including the booster pump, shown here) ,
- a transfer piston 8 is mounted displaceably, wherein in the transfer piston 8 a likewise displaceably mounted pressure control piston 9 and a pressure control spring 10, both held by a locking ring 11, are arranged.
- the transfer piston 8 in turn, is pressed by a second pressure spring 13 against the cam of the camshaft 4 via a disk 12, so that a permanent frictional contact between transfer piston and cam is ensured.
- the spring strength of the compression spring should be as low as possible in order to keep the required drive power for the pump low.
- the compression spring 13 additionally holds a check valve 14 in position.
- the transfer piston 8 (containing the pressure control spring 10 and the Pressure control piston 9 secured by the locking ring 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, wherein the sleeve 17 is opened on the camshaft side for receiving the transfer piston 8 and on the lubricant inlet side has a sufficiently large bore for filling the pump through the inlet check valve 14.
- the existing lubricant pump delivers lubricant into the inlet channel 5 of the booster pump.
- the check valve 14 Through the check valve 14, the lubricant passes into the displacement chamber 16 formed by the space between the transfer piston 8, bore 7, the inlet check valve 14 and the outlet check valve 15. Now rotates the camshaft 4 from the position shown in Fig. 1 by 90 ° in the by the arrow marked direction of rotation of the transfer piston 8 in the bore 7 and the sleeve 17 is pressed in the direction of the inlet channel 5.
- the inlet check valve 14 closes the inlet check valve 14.
- the outlet pressure should not exceed a certain desired value. This value is determined by the stiffness of the pressure control spring and the area of the pressure control piston. Now, if the desired output pressure is reached during the cam lift, the pressure control spring is compressed and a further pressure increase does not take place.
- the pump promotes approximately no fluid.
- the pressure control piston remains in one position and the camshaft performs work only against the pressure control spring.
- an additional overpressure valve may be provided either in the inlet channel 5 or in the delivery channel 6.
- the invention thus shows a device for increasing the pressure in fluids, which can be introduced at low cost of materials and extremely low installation costs in almost all common housing of the above type, there to increase the pressure supply of the camshaft adjusting device as needed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Valve Device For Special Equipments (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Details Of Reciprocating Pumps (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung bezieht sich auf eine Kolbenpumpe gemäß dem Oberbegrift des Anspruchs 1.The invention relates to a piston pump according to the preamble of claim 1.
Eine solche kolbenpumpe ist aus der FR 2 157 546 A bekannt.Such a piston pump is known from
Eine variable Ventilsteuerung 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 lubricant flow generated by the existing lubricant pump is used to actuate a located at the end of the camshaft between the drive wheel and camshaft adjustment, which in turn causes a phase shift of the camshaft. The said adjusting devices are usually supplied by bores in the camshaft, wherein the control of the lubricant flow is generally carried out 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 internal combustion engine, the lubricant quantity is indeed sufficient, but the lubricant pressure is usually too low to operate the adjustment or the operation is too slow. This known disadvantage has been compensated by the fact that a lubricant pump with increased delivery capacity is installed. However, this leads to very high power consumption of the pump at higher speeds of the reciprocating internal combustion engine, which is undesirable because it reduces the efficiency. Alternatively, two-stage or variable pumps are used which provide sufficient lubricant pressure at low speeds but not so high power consumption at high speeds. However, these pumps are very expensive.
Eine weitere Pumpe 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.Another pump is known from EP 0 976 926. It serves to a liquid medium z. B. to promote fuel and / or to increase the pressure. For this purpose, a cam directly or by means of push rod drives a piston which can move up and down in a cylindrical bore. During the upward movement of the piston, the fluid flows through the outlet channel, while at the same time passes through a check valve liquid on the second side of the piston. The downward movement of the piston, while the first-mentioned check valve closes, allows the fluid to flow through 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 described type of pump that often very high fluid pressures are achieved, which are also a hindrance in the above application.
Es 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 und hohe Montageaufwand, vermeidet, bei geringem Platzbedarf.It is the object of the present invention to improve a pressure booster pump such that it ensures an approximately constant fluid pressure for the supply of the camshaft adjusting devices while avoiding the disadvantages of the known solutions, high costs or high power consumption and high assembly costs, 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 object is achieved by a booster pump having the features of claim 1. An advantageous embodiment is contained in the subclaim.
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 internal combustion engine includes at least one camshaft provided with a known camshaft adjusting device. In the advantageous embodiment shown here, the cylinder head contains a housing in which housed the items of the booster pump are. This housing can be an integral part of the cylinder head or mounted as a separate part suitable. In the housing is a transfer piston which is driven in a known manner directly or by means of plunger of an existing cam of the engine valve control or advantageously by an additional located on the camshaft cam. In an advantageous embodiment, the transfer piston is designed as a hollow part with a transverse to the cam end fluid drain and pressure equalization hole. The transfer piston is closed on the cam side and bears against the camshaft, while the opposite end is open. The open end of the transfer piston is closed by the pressure control piston, which in turn is pressed by the pressure control piston spring against an inserted into a groove in the transfer piston circlip. Other components of the pump are also a compression spring, the transfer piston in a known manner non-positively on the cam and one to two check valves. In this case, the non-return valve held in an advantageous embodiment of the compression spring opens during the suction stroke to the inlet channel integrated into the housing while the laterally attached second check valve releases liquid into the pressure channel upon reaching the desired delivery pressure.
Erfindungsgemäß werden alle zur Druckerhöhungspumpe gehörenden Teile in einem Einsatz vormontiert, so daß eine einfache Montage der Pumpe möglich ist.According to the invention all belonging to the booster pump parts are pre-assembled in one use, so that a simple installation 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;
- Fig. 1
- a schematic vertical section through a cylinder head of a motor vehicle with the booster pump according to the invention;
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.FIG. 1 shows a vertical section of a piston pump 1 according to the invention. It can be seen that the piston pump 1 is mounted in a
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
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.In the bore 7 or as shown here in the
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, in turn, is pressed by a
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 the
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.During operation of a reciprocating internal combustion engine, the existing lubricant pump delivers lubricant into the
Der Ausgangsdruck soll 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.The outlet pressure should not exceed a certain desired value. This value is determined by the stiffness of the pressure control spring and the area of the pressure control piston. Now, if the desired output pressure is reached during the cam lift, the pressure control spring is compressed and a further pressure increase does not take place.
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 level of the desired outlet pressure or no fluid requirement by the consumer or consumers, the pump promotes approximately no fluid. The pressure control piston remains in one position and the camshaft performs work only against the 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 exceeds the desired pressure for the camshaft adjusting device by the standard delivery pump of a reciprocating internal combustion engine, an additional overpressure valve (not shown here) may be provided either in the
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
Bewegt sich die Nockenwelle weiter auf 360° beginnt der nächste Pumpzyklus.If the camshaft continues to move to 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 can be introduced at low cost of materials and extremely low installation costs in almost all common housing of the above type, there to increase the pressure supply of the camshaft adjusting device as needed.
Claims (7)
- Piston pump (1) for liquids, in particular for lubricant in reciprocating internal combustion engines, having a transfer piston (8), an inlet non-return valve (14), an outlet non-return valve (15) and a pressure control piston (9) which is displaceably arranged in the transfer piston (8) and is held by a pressure control spring (10), characterized in that a sleeve (17) is provided in which the transfer piston (8) is displaceably mounted.
- Piston pump (1) according to Claim 1, characterized in that a retaining ring (11) is provided which holds the pressure control piston (9) and the pressure control spring (10) in the transfer piston (9).
- Piston pump (1) according to Claim 1 or 2, characterized in that a compression spring (13) is provided on that side of the transfer piston (8) which faces the inlet non-return valve (14), this compression spring (13) loading the transfer piston (8) via a disc (12).
- Piston pump (1) according to Claim 3, characterized in that the disc (12), the compression spring (13) and the inlet non-return valve (14) are arranged in the sleeve (17).
- Piston pump (1) according to Claim 4, characterized in that a second retaining ring (18) is provided which retains the transfer piston (8) together with pressure control piston (9) and pressure control spring (10), the disc (12), the compression spring (13) and the inlet non-return valve (14).
- Piston pump (1) according to one of the preceding claims, characterized in that, on the side facing the inlet non-return valve (14), the sleeve (17) has a hole for filling the piston pump (1) through the inlet non-return valve (14).
- Piston pump (1) according to one of the preceding claims, characterized in that, on the side remote from the inlet non-return valve (14), the sleeve (17) is open for accommodating the transfer piston (8).
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 EP1247983A1 (en) | 2002-10-09 |
| EP1247983B1 true 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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|---|---|---|---|---|
| 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 |
| US7314353B2 (en) * | 2004-10-08 | 2008-01-01 | Urschel Laboratories, Inc. | Pump assembly for transporting a cooling fluid |
| US20090272366A1 (en) * | 2008-04-30 | 2009-11-05 | Caterpillar Inc. | Internal combustion engine set up method and fuel pump having installation assist mechanism |
| 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 |
| GB2622016A (en) * | 2022-08-30 | 2024-03-06 | Delphi Tech Ip Ltd | Lubricant dosing device for gaseous fuel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE28880E (en) * | 1967-07-21 | 1976-06-29 | Colorflo Limited | Printing machines feed mechanism |
| DE2151715A1 (en) * | 1971-10-18 | 1973-04-26 | Kloeckner Humboldt Deutz Ag | SELF-REGULATING PISTON PUMP |
| FR2210722B1 (en) * | 1973-11-26 | 1975-06-06 | Poclain Sa | |
| DE19820902A1 (en) * | 1998-05-09 | 1999-11-11 | Bosch Gmbh Robert | Piston pump for a vehicle hydraulic brake system |
| EP1046793A3 (en) | 1999-04-21 | 2002-08-21 | Ford Global Technologies, Inc. | Variable cam timing system and method |
| DE19918122A1 (en) * | 1999-04-22 | 2000-11-23 | Bosch Gmbh Robert | Piston pump |
| JP3850598B2 (en) * | 1999-10-07 | 2006-11-29 | 株式会社日立製作所 | Vane valve timing control device for internal combustion engine |
| US20020056427A1 (en) * | 1999-12-21 | 2002-05-16 | Chun Liang Lee | Cam timing system |
| JP4203703B2 (en) * | 2000-06-14 | 2009-01-07 | アイシン精機株式会社 | Valve timing control device |
-
2001
- 2001-04-07 EP EP01108795A patent/EP1247983B1/en not_active Expired - Lifetime
- 2001-04-07 DE DE50108826T patent/DE50108826D1/en not_active Expired - Lifetime
-
2002
- 2002-03-27 US US10/063,169 patent/US6676389B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US20020146337A1 (en) | 2002-10-10 |
| US6676389B2 (en) | 2004-01-13 |
| DE50108826D1 (en) | 2006-04-13 |
| EP1247983A1 (en) | 2002-10-09 |
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