EP0745771A1 - Radial piston pump - Google Patents

Radial piston pump Download PDF

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Publication number
EP0745771A1
EP0745771A1 EP96107585A EP96107585A EP0745771A1 EP 0745771 A1 EP0745771 A1 EP 0745771A1 EP 96107585 A EP96107585 A EP 96107585A EP 96107585 A EP96107585 A EP 96107585A EP 0745771 A1 EP0745771 A1 EP 0745771A1
Authority
EP
European Patent Office
Prior art keywords
radial piston
piston pump
pump according
pressure
ring
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.)
Granted
Application number
EP96107585A
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German (de)
French (fr)
Other versions
EP0745771B1 (en
Inventor
Ulrich Hiltemann
Dieter Otto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magna Powertrain Hueckeswagen GmbH
Original Assignee
LuK Automobiltechnik GmbH and Co KG
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Publication of EP0745771A1 publication Critical patent/EP0745771A1/en
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Publication of EP0745771B1 publication Critical patent/EP0745771B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • 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
    • F04B1/0452—Distribution members, e.g. valves
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F04B23/023—Pumping installations or systems having reservoirs the pump being immersed in the reservoir only the pump-part being immersed, the driving-part being outside the reservoir

Definitions

  • the invention relates to a radial piston pump according to the preamble of claim 1.
  • Rumps of the type mentioned here are known.
  • pumps are addressed, the delivery volume of which is effected by a so-called inflow restriction or suction throttling.
  • the aim of the regulation is to reduce the power loss.
  • the problem arises that a vacuum occurs on the suction side, so that cavitation occurs. This leads to a relatively high level of noise during operation of the pump.
  • Pumps of this type are also characterized by a high level of noise because pressure pulsations and strong eddies occur on the high-pressure side of the pump.
  • liquid-filled space is designed as an annular space which completely surrounds the piston ring.
  • Such an implementation is relatively inexpensive to manufacture.
  • an embodiment of the radial piston pump is preferred in which the liquid present in the liquid-filled space is not or only under a slight excess pressure, is preferably connected to the suction side of the radial piston pump. Vibrations emitted by the sealing plugs into the liquid are thus damped so that vibrations of the pump housing are reduced to a minimum.
  • an embodiment of the radial piston pump is preferred, in which the pressure outlet openings, through which the fluid conveyed by the pistons exits under high pressure, come from a sealing device are completed, which has spring tongues. These are characterized by a low weight, so that vibrations in the operation of the pump, but also pressure pulsations during the delivery of the fluid are reduced to a minimum and thus noise is reduced.
  • the radial piston pump 1 shown in Figure 1 has a pump housing 3, which comprises two sub-elements, namely a base body 5 and a cover 7.
  • the base body 5 is very solid, it carries a shaft 9 which is supported in the base body 5 by means of a bearing 11 and is provided with a seal 13.
  • a suitable drive wheel 17 is rotatably attached. This serves to drive the radial piston pump 1, which is preferably used in connection with internal combustion engines of a motor vehicle and is driven by a suitable belt. It is used to generate a fluid flow, which is used, for example, to stabilize the undercarriage, but also to support the steering forces.
  • the shaft 9 has an eccentric 21 arranged eccentrically to its axis of rotation 19 and a shaft extension 25 mounted in a bearing 23, which is arranged concentrically with the other sections of the shaft 9.
  • a piston ring 27 is provided which is connected to the base body 5 in a rotationally fixed manner and which is preferably provided in one piece with a bearing projection 29 which supports the bearing 23 and thus the shaft projection 25.
  • the piston ring 27 is fastened in a suitable manner, for example with the aid of screws 31, to the base body 5 in a rotationally fixed manner. It is provided with bores 33 extending in the radial direction to the axis of rotation 19, in which the pistons 35 of the rotary piston pump 1 are slidably mounted in the radial direction.
  • the bores 33 are open on their side facing the eccentric 21 and are closed in a pressure-tight manner on the opposite side with a sealing plug 37.
  • a helical spring 39 is supported, which rests against the bottom of the internally hollow piston 35 and exerts a compressive force. The bottom is pressed against the surface of the eccentric 21.
  • a suitable bearing ring 41 can be provided here.
  • the base body 9 has an annular wall region 43 which surrounds the piston ring 27.
  • the inside diameter of the ring wall area 43 is matched to the outside diameter of the piston ring 27 such that a liquid-filled space 45 is provided at least in the area of the sealing plug 27.
  • this space is designed as a continuous annular space which is filled with a liquid.
  • This is in fluid connection with the liquid 47 drawn in by the radial piston pump 1, which is connected via a suction channel 49 to a liquid-filled suction section 51, which is designed as an annular space and surrounds the eccentric.
  • the pistons 35 draw in liquid from the suction section 51.
  • suction openings 53 which are introduced into the side wall of the pistons 35 and are connected to the suction section 51 when the pistons are moved into their suction position by the helical spring, in which the bottom of the pistons 35 is arranged so close to the axis of rotation 19 is that the suction openings 53 are no longer closed by the wall of the bore 33.
  • the piston 33 is in its maximally pushed-in position, its base being at the greatest distance from the axis of rotation 19.
  • the liquid sucked in through the suction openings 53 therefore becomes very high Pressure is expelled into the high-pressure region 55 of the pump and conveyed into a pressure groove 57 which runs concentrically to the axis of rotation 19.
  • the pressurized liquid enters through openings 33 in the piston ring 27, not shown here, from the bore 33 into the pressure groove 57, which are closed off by a suitable sealing device 61.
  • the sealing device prevents the high-pressure fluid from flowing back out of the pressure groove 57 into the bore 33.
  • the cover 7 of the radial piston pump 1 is provided with an intake port 59, via which the fluid sucked in by the radial piston pump 1, usually hydraulic oil, enters the space closed by the cover 7 and from there into the suction section 51.
  • the exemplary embodiment of the radial piston pump 1 shown here has six pistons 35 which are guided in bores 33 in the piston ring 27. As explained with reference to FIG. 1, the bores 33 are closed off on their side facing away from the eccentric 21 with a sealing plug 37. It can also be seen here that the piston ring 27 has an outer diameter which is smaller than the inner diameter of the ring wall region 43 of the base body 5 of the pump housing 3.
  • Piston 35 is maximally inserted into the bore 33, while the opposite piston 35 is in its maximum extended position.
  • the eccentric may rotate clockwise, for example, so that the piston 35 to the left of the lowermost piston is inserted a little further into the bore 33 than the lowermost piston.
  • the clockwise following piston 35 is pushed even further into the bore so that the liquid enclosed in the interior of the piston is under pressure. This continues to increase until the piston has reached the 12 o'clock position.
  • Loud noises occur during the operation of the pump, which are based on one hand on cavitation inside the bores 33 and on the other hand on high pressure increases which are caused by a very uneven volume flow. This is unavoidable with suction control.
  • the noises are emitted to the environment via the sealing plug 37, here to the ring-shaped space 45 which completely surrounds the piston ring 27. Vibrations of the sealing plug 37 and thus noises emanating therefrom are damped by the liquid which is not under pressure in the annular space 45. Since the ring wall region 43 which has the fastening points for the pump is relatively solid as part of the base body 5, this additionally dampens the noise emanating from the piston 35. It is therefore possible to make the cover 7 relatively light and thin-walled and thus inexpensive.
  • the cover 7 is attached to the base body 5 via a seal 59 which seals against low pressure or outwards. All that is required is a further seal, namely the seal 13 on the shaft 9, which is also to be referred to as a low pressure seal and seals against the outside or against low pressure, in order to seal the liquid present in the interior of the radial piston pump 1 from the environment. Liquid, which for example emerges from the interior of the bores 33 in the area of the sealing plug 37, does not get into the open, but into the space 45 and thus into the suction area of the pump.
  • the pressure groove 57 is sealed off by the piston ring 27 firmly pressed onto the base body 5.
  • FIG. 2 the rest of the parts that have already been explained in FIG. 1 are provided with the same reference numbers, so that their further description in connection with FIG. 2 can be dispensed with.
  • FIG. 3 shows a detail of the sealing device 61 already explained with reference to FIGS. 1 and 2, which seals off the pressure outlet openings opening into the pressure groove 57.
  • the sealing device 61 consists of a flat material, for example of metal, and is preferably designed as a stamped part.
  • a continuous support ring 63 is provided, which has a plurality of substantially C-shaped recesses 65 distributed over its circumference, which are preferably punched out.
  • these recesses 65 there are sealing plates 67 which are oval in shape and are connected to the support ring 63 via a narrow spring web 69. It can be seen that two pressure outlet openings 71 are assigned to each sealing plate 67 here. It is also conceivable to form the sealing plates 67 round and to arrange them centrally above a pressure outlet opening 71.
  • the support ring 63 of the sealing device 61 is pressed against the surface into which the pressure outlet openings 71 open.
  • the sealing plates 67 are pressed against the pressure outlet openings 71 due to the spring force of the spring webs 69, so that these are sealed off and pressurized liquid cannot return to the pressure outlet openings 71.
  • the sealing plate 67 thus act as a kind of check valve.
  • the complete sealing device 61 in the form of a sheet metal part can be flat, but the spring webs 69 are preferably designed to be somewhat curved or slightly angled. If the sheet metal part is now clamped between the base body 5 and the piston ring 27, the spring webs 69 closing the pressure outlet openings 71 have a pretension.
  • the mass of the sealing plate is very small. It therefore requires a relatively small pulse to lift the sealing plate 67 from the pressure outlet openings 71, so that there are very low pressure pulsations during operation of the radial piston pump 1.
  • the pressure groove 57 is connected to a conventional outlet 73 which, as indicated by an arrow, leads to a suitable consumer.
  • the area of the radial piston pump 1 is present in the liquid under high pressure, that is to say in particular the piston ring 27, is completely encapsulated in the interior of the pump housing 3 and is additionally surrounded by a liquid which is under a low pressure. Vibrations and noises from Piston ring 27 are therefore only released to a very small extent to the surroundings of the radial piston pump 1.
  • the noise source of the pump is also shielded by the fact that the piston ring 27 is completely enclosed by a solid wall area of the pump housing 3, namely by the ring wall area 43.
  • the forces required for fastening the piston ring 27 are introduced inside the pump housing 3 into the base body 5, so that no vibrations are transmitted to free-standing housing areas, for example to the ring wall area 43.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The pump has a stationary piston ring (27), retaining the pistons, radially located w.r.t. the shaft, and enclosing the eccentric. The ring has bores, open to the eccentric, for reception of the pistons. Each bore is closed at its end, away from the eccentric, by a stopper (37). The piston ring is so enclosed by the pump casing (3) that at least one liquid chamber (45) is formed between the stopper and the inside of the pump casing. Pref the liquid chamber is annular, fully surrounding the piston ring. Typically the liquid in the chamber is not pressurised, or only slightly so.

Description

Die Erfindung betrifft eine Radialkolbenpumpe gemäß Oberbegriff des Anspruchs 1. Rumpen der hier angesprochenen Art sind bekannt. Es werden insbesondere Pumpen angesprochen, deren Fördervolumen durch eine sogenannte Zuflußabschnürung oder Saugdrosselung erfolgt. Die Regelung hat das Ziel, die Verlustleistung zu reduzieren. Bei derartigen Regelungen tritt das Problem auf, daß sich auf der Saugseite ein Unterdruck einstellt, so daß Kavitation auftritt. Diese führt zu einer relativ starken Geräuschentwicklung im Betrieb der Pumpe. Derartige Pumpen zeichnen sich auch deshalb durch eine starke Geräuschentwicklung aus, weil auf der Hochdruckseite der Pumpe Druckpulsationen und starke Wirbel entstehen.The invention relates to a radial piston pump according to the preamble of claim 1. Rumps of the type mentioned here are known. In particular, pumps are addressed, the delivery volume of which is effected by a so-called inflow restriction or suction throttling. The aim of the regulation is to reduce the power loss. With such regulations, the problem arises that a vacuum occurs on the suction side, so that cavitation occurs. This leads to a relatively high level of noise during operation of the pump. Pumps of this type are also characterized by a high level of noise because pressure pulsations and strong eddies occur on the high-pressure side of the pump.

Es ist daher Aufgabe der Erfindung, eine Radialkolbenpumpe der hier angesprochenen Art zu schaffen, die relativ geräuscharm arbeitet. Diese Aufgabe wird bei einer Pumpe gemäß Oberbegriff des Anspruchs 1 mit Hilfe der in diesem Anspruch wiedergebenen Merkmale gelöst. Dadurch, daß der Kolbenring, in dem die Kolben im Betrieb der Pumpe hin und her bewegt werden, von dem Pumpengehäuse so umschlossen wird, daß zumindest zwischen den die Bohrungen für die Kolben abschließenden Verschlußstopfen und der Innenseite des Pumpengehäuses ein flüssigkeitsgefüllter Raum gegeben ist. Dieser dämmt die von dem Verschlußstopfen ausgehenden Schwingungen beziehungsweise Schallwellen, so daß sich ein relativ geräuscharmer Betrieb der Pumpe ergibt.It is therefore an object of the invention to provide a radial piston pump of the type mentioned here, which operates relatively quietly. This object is achieved in a pump according to the preamble of claim 1 with the aid of that recited in this claim Features resolved. Characterized in that the piston ring, in which the pistons are moved back and forth during operation of the pump, is enclosed by the pump housing in such a way that there is a liquid-filled space at least between the sealing plugs that close the bores for the pistons and the inside of the pump housing. This dampens the vibrations or sound waves emanating from the sealing plug, so that the pump operates relatively quietly.

Bevorzugt wird eine Ausführungsform der Radialkolbenpumpe, bei der der flüssigkeitsgefüllte Raum als Ringraum ausgebildet ist, der den Kolbenring vollständig umgibt. Eine derartige Realisierung ist relativ kostengünstig herstellbar.An embodiment of the radial piston pump is preferred in which the liquid-filled space is designed as an annular space which completely surrounds the piston ring. Such an implementation is relatively inexpensive to manufacture.

Weiterhin wird eine Ausführungsform der Radialkolbenpumpe bevorzugt, bei der die in dem flüssigkeitsgefüllten Raum vorhandene Flüssigkeit nicht oder nur unter einem geringen Überdruck steht, vorzugsweise mit der Saugseite der Radialkolbenpumpe verbunden ist. Von den Verschlußstopfen in die Flüssigkeit abgegebene Schwingungen werden damit so gedämpft, daß Schwingungen des Pumpengehäuses auf ein Minimum reduziert sind.Furthermore, an embodiment of the radial piston pump is preferred in which the liquid present in the liquid-filled space is not or only under a slight excess pressure, is preferably connected to the suction side of the radial piston pump. Vibrations emitted by the sealing plugs into the liquid are thus damped so that vibrations of the pump housing are reduced to a minimum.

Weiterhin wird eine Ausführungsform der Radialkolbenpumpe bevorzugt, bei der die Druckauslaßöffnungen, über die das von den Kolben geförderte Fluid unter hohem Druck austritt, von einer Dichtungseinrichtung abgeschlossen sind, die Federzungen aufweist. Diese Zeichnen sich durch ein geringes Gewicht aus, so daß Schwingungen im Betrieb der Pumpe, aber auch Druckpulsationen bei der Förderung des Fluids auf ein Minimum reduziert werden und somit eine Geräuschreduktion eintritt.Furthermore, an embodiment of the radial piston pump is preferred, in which the pressure outlet openings, through which the fluid conveyed by the pistons exits under high pressure, come from a sealing device are completed, which has spring tongues. These are characterized by a low weight, so that vibrations in the operation of the pump, but also pressure pulsations during the delivery of the fluid are reduced to a minimum and thus noise is reduced.

Weitere Ausgestaltungen der Radialkolbenpumpe ergeben sich aus den übrigen Unteransprüchen.Further configurations of the radial piston pump result from the remaining subclaims.

Die Radialkolbenpumpe wird im folgenden anhand der Zeichnung näher erläutert. Es zeigen:

Figur 1
einen Längsschnitt durch die Radialkolbenpumpe;
Figur 2
einen Querschnitt durch die Radialkolbenpumpe gemäß Figur 1 im Bereich des Kolbenrings und
Figur 3
eine schematische Darstellung eines Teilbereichs des Dichtrings.
The radial piston pump is explained in more detail below with reference to the drawing. Show it:
Figure 1
a longitudinal section through the radial piston pump;
Figure 2
a cross section through the radial piston pump according to Figure 1 in the region of the piston ring and
Figure 3
is a schematic representation of a portion of the sealing ring.

Die in Figur 1 dargestellte Radialkolbenpumpe 1 weist ein Pumpengehäuse 3 auf, das zwei Teilelemente umfaßt, nämlich einen Grundkörper 5 und einen Deckel 7. Der Grundkörper 5 ist sehr massiv ausgebildet, er trägt eine Welle 9, die mittels eines Lagers 11 im Grundkörper 5 gelagert und mit einer Dichtung 13 versehen ist. An einem Wellenstummel 15 ist ein geeignetes Antriebsrad 17 drehfest angebracht. Dieses dient dem Antrieb der Radialkolbenpumpe 1, die vorzugsweise im Zusammenhang mit Brennkraftmaschinen eines Kraftfahrzeugs verwendet und über einen geeigneten Riemen angetrieben wird Sie dient der Erzeugung eines Fluidstroms, der beispielsweise für die Fahrwerkstabilisierung, aber auch für die Unterstützung der Lankkräfte Verwendung findet.The radial piston pump 1 shown in Figure 1 has a pump housing 3, which comprises two sub-elements, namely a base body 5 and a cover 7. The base body 5 is very solid, it carries a shaft 9 which is supported in the base body 5 by means of a bearing 11 and is provided with a seal 13. On a stub shaft 15, a suitable drive wheel 17 is rotatably attached. This serves to drive the radial piston pump 1, which is preferably used in connection with internal combustion engines of a motor vehicle and is driven by a suitable belt. It is used to generate a fluid flow, which is used, for example, to stabilize the undercarriage, but also to support the steering forces.

Die Welle 9 weist einen exzentrisch zu ihrer Drehachse 19 angeordneten Exzenter 21 auf sowie einen in einem Lager 23 gelagerten Wellenansatz 25, der konzentrisch zu den übrigen Abschnitten der Welle 9 angeordnet ist.The shaft 9 has an eccentric 21 arranged eccentrically to its axis of rotation 19 and a shaft extension 25 mounted in a bearing 23, which is arranged concentrically with the other sections of the shaft 9.

Im Bereich des Exzenters 21 ist ein drehfest mit dem Grundkörper 5 verbundener Kolbenring 27 vorgesehen, der vorzugsweise einstückig mit einem Lageransatz 29 versehen ist, der das Lager 23 und damit den Wellenansatz 25 trägt.In the area of the eccentric 21, a piston ring 27 is provided which is connected to the base body 5 in a rotationally fixed manner and which is preferably provided in one piece with a bearing projection 29 which supports the bearing 23 and thus the shaft projection 25.

Der Kolbenring 27 ist auf geeignete Weise, beispielsweise mit Hilfe von Schrauben 31, drehfest am Grundkörper 5 befestigt. Er ist mit in radialer Richtung zur Drehachse 19 verlaufenden Bohrungen 33 versehen, in denen die Kolben 35 der Rotationskolbenpumpe 1 in radialer Richtung verschieblich gelagert sind. Die Bohrungen 33 sind auf ihrer dem Exzenter 21 zugewandten Seite offen und auf der gegenüberliegenden Seite mit einem Verschlußstopfen 37 druckdicht abgeschlossen. Auf der Innenseite des Verschlußstopfens stützt sich eine Schraubenfeder 39 ab, die gegen den Boden des innen hohlen Kolbens 35 anliegt und eine Druckkraft ausübt. Der Boden wird gegen die Oberfläche des Exzenters 21 gepreßt.The piston ring 27 is fastened in a suitable manner, for example with the aid of screws 31, to the base body 5 in a rotationally fixed manner. It is provided with bores 33 extending in the radial direction to the axis of rotation 19, in which the pistons 35 of the rotary piston pump 1 are slidably mounted in the radial direction. The bores 33 are open on their side facing the eccentric 21 and are closed in a pressure-tight manner on the opposite side with a sealing plug 37. On the inside of the sealing plug, a helical spring 39 is supported, which rests against the bottom of the internally hollow piston 35 and exerts a compressive force. The bottom is pressed against the surface of the eccentric 21.

Es kann hier ein geeigneter Lagerring 41 vorgesehen sein.A suitable bearing ring 41 can be provided here.

Der Grundkörper 9 weist einen Ringwandbereich 43 auf, der den Kolbenring 27 umgibt. Der Innendurchmesser des Ringwandbereichs 43 ist so auf den Außendurchmesser des Kolbenrings 27 abgestimmt, daß zumindest im Bereich der Verschlußstopfen 27 ein flüssigkeitsgefüllter Raum 45 gegeben ist. Bei dem hier dargestellten Ausführungsbeispiel ist dieser Raum als durchgehender Ringraum ausgebildet, der mit einer Flüssigkeit aufgefüllt ist. Diese steht mit der von der Radialkolbenpumpe 1 angesaugten Flüssigkeit 47 in Fluidverbindung, die über einen Saugkanal 49 mit einem flüssigkeitsgefüllten Saugabschnitt 51 in Verbindung steht, der als ringförmiger Raum ausgebildet ist und den Exzenter umgibt. Aus dem Saugabschnitt 51 saugen im Betrieb der Pumpe 1 die Kolben 35 Flüssigkeit an. Sie sind dazu mit in die Seitenwand der Kolben 35 eingebrachten Saugöffnungen 53 versehen, die mit dem Saugabschnitt 51 in Verbindung stehen, wenn die Kolben durch die Schraubenfeder in ihre Saugstellung verfahren werden, in der der Boden der Kolben 35 so nahe an der Drehachse 19 angeordnet ist, daß die Saugöffnungen 53 nicht mehr von der Wandung der Bohrung 33 verschlossen werden.The base body 9 has an annular wall region 43 which surrounds the piston ring 27. The inside diameter of the ring wall area 43 is matched to the outside diameter of the piston ring 27 such that a liquid-filled space 45 is provided at least in the area of the sealing plug 27. In the exemplary embodiment shown here, this space is designed as a continuous annular space which is filled with a liquid. This is in fluid connection with the liquid 47 drawn in by the radial piston pump 1, which is connected via a suction channel 49 to a liquid-filled suction section 51, which is designed as an annular space and surrounds the eccentric. During operation of the pump 1, the pistons 35 draw in liquid from the suction section 51. For this purpose, they are provided with suction openings 53 which are introduced into the side wall of the pistons 35 and are connected to the suction section 51 when the pistons are moved into their suction position by the helical spring, in which the bottom of the pistons 35 is arranged so close to the axis of rotation 19 is that the suction openings 53 are no longer closed by the wall of the bore 33.

Bei der Darstellung gemäß Figur 1 befindet sich der Kolben 33 in seiner maximal eingeschobenen Position, wobei sein Boden den größten Abstand zur Drehachse 19 aufweist. Die durch die Saugöffnungen 53 eingesaugte Flüssigkeit wird daher unter hohem Druck in den Hochdruckbereich 55 der Pumpe ausgestoßen und in eine konzentrisch zur Drehachse 19 umlaufende Drucknut 57 gefördert. Die unter Druck stehende Flüssigkeit tritt über hier nicht dargestellte Öffnungen im Kolbenring 27 aus der Bohrung 33 in die Drucknut 57 ein, die durch eine geeignete Dichtungseinrichtung 61 abgeschlossen sind. Die Dichtungseinrichtung verhindert, daß das unter hohem Druck stehende Fluid aus der Drucknut 57 in die Bohrung 33 zurückströmt.In the illustration according to FIG. 1, the piston 33 is in its maximally pushed-in position, its base being at the greatest distance from the axis of rotation 19. The liquid sucked in through the suction openings 53 therefore becomes very high Pressure is expelled into the high-pressure region 55 of the pump and conveyed into a pressure groove 57 which runs concentrically to the axis of rotation 19. The pressurized liquid enters through openings 33 in the piston ring 27, not shown here, from the bore 33 into the pressure groove 57, which are closed off by a suitable sealing device 61. The sealing device prevents the high-pressure fluid from flowing back out of the pressure groove 57 into the bore 33.

Der Deckel 7 der Radialkolbenpumpe 1 ist mit einem Ansaugstutzen 59 versehen, über den das von der Radialkolbenpumpe 1 angesaugte Fluid, in der Regel ein Hydrauliköl, in den von dem Deckel 7 abgeschlossenen Raum gelangt und von dort in den Saugabschnitt 51.The cover 7 of the radial piston pump 1 is provided with an intake port 59, via which the fluid sucked in by the radial piston pump 1, usually hydraulic oil, enters the space closed by the cover 7 and from there into the suction section 51.

Aus der Querschnittdarstellung gemäß Figur 2 ist ersichtlich, daß das hier wiedergegebene Ausführungsbeispiel der Radialkolbenpumpe 1 sechs Kolben 35 aufweist, die in Bohrungen 33 im Kolbenring 27 geführt sind. Die Bohrungen 33 sind, wie anhand von Figur 1 erläutert, auf ihrer dem Exzenter 21 abgewandten Seite mit einem Verschlußstopfen 37 abgeschlossen. Auch hier ist ersichtlich, daß der Kolbenring 27 einen Außendurchmesser aufweist, der kleiner ist als der Innendurchmesser des Ringwandbereichs 43 des Grundkörpers 5 des Pumpengehäuses 3.It can be seen from the cross-sectional view according to FIG. 2 that the exemplary embodiment of the radial piston pump 1 shown here has six pistons 35 which are guided in bores 33 in the piston ring 27. As explained with reference to FIG. 1, the bores 33 are closed off on their side facing away from the eccentric 21 with a sealing plug 37. It can also be seen here that the piston ring 27 has an outer diameter which is smaller than the inner diameter of the ring wall region 43 of the base body 5 of the pump housing 3.

Aus der Darstellung in Figur 2 wird auch deutlich, daß der oben liegende, in einer 12-Uhr-Position angeordnete Kolben 35 maximal in die Bohrung 33 eingeschoben ist, während der sich gegenüberliegende Kolben 35 in seiner maximal ausgefahrenen Position befindet. Der Exzenter möge sich beispielsweise im Uhrzeigersinn drehen, so daß der links von dem untersten Kolben liegende Kolben 35 etwas weiter eingeschoben ist in die Bohrung 33, als der unterste Kolben. Der im Uhrzeigersinn nachfolgende Kolben 35 ist noch weiter in die Bohrung eingeschoben, daß die im Inneren des Kolbens eingeschlossene Flüssigkeit unter Druck steht. Dieser nimmt weiter zu, bis der Kolben die 12-Uhr-Position eingenommen hat.It is also clear from the illustration in FIG. 2 that the one above is arranged in a 12 o'clock position Piston 35 is maximally inserted into the bore 33, while the opposite piston 35 is in its maximum extended position. The eccentric may rotate clockwise, for example, so that the piston 35 to the left of the lowermost piston is inserted a little further into the bore 33 than the lowermost piston. The clockwise following piston 35 is pushed even further into the bore so that the liquid enclosed in the interior of the piston is under pressure. This continues to increase until the piston has reached the 12 o'clock position.

Im Betrieb der Pumpe entstehen laute Geräusche, die einerseits auf Kavitation im Inneren der Bohrungen 33 beruhen und andererseits auf hohen Druckplusationen, die durch einen sehr ungleichmäßigen Volumenstrom hervorgerufen werden. Dieser ist bei Saugregelung unvermeidbar. Die Geräusche werden über die Verschlußstopfen 37 an die Umgebung abgegeben, hier an den ringförmig ausgebildeten Raum 45, der den Kolbenring 27 vollständig umgibt. Vibrationen der Verschlußstopfen 37 und damit von diesen ausgehende Geräusche werden durch die nicht unter Überdruck stehende Flüssigkeit in dem ringförmigen ausgebildeten Raum 45 gedämpft. Da der die Befestigungspunkte für die Pumpe aufweisende Ringwandbereich 43 als Teil des Grundkörpers 5 relativ massiv ausgebildet ist, dämpft dieser zusätzlich die von den Kolben 35 ausgehenden Geräusche. Es ist also möglich, den Deckel 7 relativ leicht und dünnwandig und damit kostengünstig auszubilden.Loud noises occur during the operation of the pump, which are based on one hand on cavitation inside the bores 33 and on the other hand on high pressure increases which are caused by a very uneven volume flow. This is unavoidable with suction control. The noises are emitted to the environment via the sealing plug 37, here to the ring-shaped space 45 which completely surrounds the piston ring 27. Vibrations of the sealing plug 37 and thus noises emanating therefrom are damped by the liquid which is not under pressure in the annular space 45. Since the ring wall region 43 which has the fastening points for the pump is relatively solid as part of the base body 5, this additionally dampens the noise emanating from the piston 35. It is therefore possible to make the cover 7 relatively light and thin-walled and thus inexpensive.

Der Deckel 7 ist -wie aus Figur 1 ersichtlich- über eine gegen Niederdruck beziehungsweise nach außen dichtende Dichtung 59 am Grundkörper 5 angebracht. Es bedarf lediglich einer weiteren Dichtung, nämlich der auch als Niederdruckdichtung zu bezeichnende, nach außen beziehungsweise gegen Niederdruck dichtende Dichtung 13 an der Welle 9, um die im Inneren der Radialkolbenpumpe 1 vorhandene Flüssigkeit gegenüber der Umgebung abzudichten. Flüssigkeit, die beispielsweise im Bereich der Verschlußstopfen 37 aus dem Inneren der Bohrungen 33 austritt, gelangt nicht ins Freie, sondern in den Raum 45 und damit in den Saugbereich der Pumpe. Die Drucknut 57 wird vom am Grundkörper 5 fest angepreßten Kolbenring 27 dicht abgeschlossen. Zwischen Grundkörper 5 und Kolbenring 27 ist also eine innenliegende Hochdruckdichtung gegeben, die nicht nach außen dichtet. Sollte hier Flüssigkeit austreten, gelangt diese wiederum nicht nach außen in die Umgebung, sondern in den Saugbereich der Pumpe. Der Aufbau der Radialkolbenpumpe 1 ist also bezüglich der Dichtungen sehr einfach und kostengünstig realisierbar. Mit dieser Ausführungsform -keine außenliegende, das heißt nach außen dichtende Hochdruckdichtung, nur zwei oder drei Niederdruckdichtungen- wird eine sehr hohe Sicherheit bezüglich der Dichtigkeit der Pumpe erreicht.As can be seen from FIG. 1, the cover 7 is attached to the base body 5 via a seal 59 which seals against low pressure or outwards. All that is required is a further seal, namely the seal 13 on the shaft 9, which is also to be referred to as a low pressure seal and seals against the outside or against low pressure, in order to seal the liquid present in the interior of the radial piston pump 1 from the environment. Liquid, which for example emerges from the interior of the bores 33 in the area of the sealing plug 37, does not get into the open, but into the space 45 and thus into the suction area of the pump. The pressure groove 57 is sealed off by the piston ring 27 firmly pressed onto the base body 5. Between the base body 5 and the piston ring 27 there is an internal high-pressure seal which does not seal to the outside. If liquid escapes here, it does not reach the outside, but the suction area of the pump. The structure of the radial piston pump 1 can therefore be implemented very simply and inexpensively with regard to the seals. With this embodiment — no external, that is to say outward-sealing, high-pressure seal, only two or three low-pressure seals — a very high level of safety with regard to the tightness of the pump is achieved.

In Figur 2 sind im übrigen Teile, die in Figur 1 bereits erläutert wurden, mit gleichen Bezugsziffern versehen, so daß auf deren weitere Beschreibung im Zusammenhang mit Figur 2 verzichtet werden kann.In FIG. 2, the rest of the parts that have already been explained in FIG. 1 are provided with the same reference numbers, so that their further description in connection with FIG. 2 can be dispensed with.

Figur 3 zeigt einen Ausschnitt, der anhand der Figuren 1 und 2 bereits erläuterten Dichtungseinrichtung 61, die die in die Drucknut 57 mündenden Druckauslaßöffnungen abschließt.FIG. 3 shows a detail of the sealing device 61 already explained with reference to FIGS. 1 and 2, which seals off the pressure outlet openings opening into the pressure groove 57.

Die Dichtungseinrichtung 61 besteht aus einem flachen Material, beispielsweise aus Metall, und ist vorzugsweise als Stanzteil ausgebildet. Bei dem hier dargestellten Ausführungsbeispiel ist ein durchgehender Tragring 63 vorgesehen, der über seinen Umfang verteilt mehrere im wesentlichen C-förmige Ausnehmungen 65 aufweist, die vorzugsweise ausgestanzt sind. In diesen Ausnehmungen 65 befinden sich Dichtplättchen 67, die oval ausgebildet sind und über einen schmalen Federsteg 69 mit dem Tragring 63 verbunden sind. Es ist ersichtlich, daß jedem Dichtplättchen 67 hier zwei Druckauslaßöffnungen 71 zugeordnet sind. Es ist auch denkbar, die Dichtplättchen 67 rund auszubilden und diese zentral über einer Druckauslaßöffnung 71 anzuordnen.The sealing device 61 consists of a flat material, for example of metal, and is preferably designed as a stamped part. In the embodiment shown here, a continuous support ring 63 is provided, which has a plurality of substantially C-shaped recesses 65 distributed over its circumference, which are preferably punched out. In these recesses 65 there are sealing plates 67 which are oval in shape and are connected to the support ring 63 via a narrow spring web 69. It can be seen that two pressure outlet openings 71 are assigned to each sealing plate 67 here. It is also conceivable to form the sealing plates 67 round and to arrange them centrally above a pressure outlet opening 71.

Der Tragring 63 der Dichtungseinrichtung 61 wird gegen die Oberfläche angepreßt, in die die Druckauslaßöffnungen 71 münden. Dadurch werden die Dichtplättchen 67 aufgrund der Federkraft der Federstege 69 gegen die Druckauslaßöffnungen 71 gepreßt, so daß diese abgeschlossen werden und unter Druck stehende Flüssigkeit nicht in die Druckauslaßöffnungen 71 zurückgelangen kann. Die Dichtplättchen 67 wirken also quasi als Rückschlagventil.The support ring 63 of the sealing device 61 is pressed against the surface into which the pressure outlet openings 71 open. As a result, the sealing plates 67 are pressed against the pressure outlet openings 71 due to the spring force of the spring webs 69, so that these are sealed off and pressurized liquid cannot return to the pressure outlet openings 71. The sealing plate 67 thus act as a kind of check valve.

Die komplette als Blechteil ausgebildete Dichtungseinrichtung 61 kann eben sein, vorzugsweise werden aber die Federstege 69 etwas gekrümmt oder auch leicht abgewinkelt ausgeführt. Wird das Blechteil nun zwischen Grundkörper 5 und Kolbenring 27 eingespannt, weisen die die Druckauslaßöffnungen 71 verschließenden Federstege 69 eine Vorspannung auf.The complete sealing device 61 in the form of a sheet metal part can be flat, but the spring webs 69 are preferably designed to be somewhat curved or slightly angled. If the sheet metal part is now clamped between the base body 5 and the piston ring 27, the spring webs 69 closing the pressure outlet openings 71 have a pretension.

Da das Material des Tragrings 63 und damit der Dichtplättchen 67 sehr dünn ausgebildet werden kann, ist die Masse der Dichtplättchen sehr gering. Es bedarf also eines relativ geringen Impulses, die Dichtplättchen 67 von den Druckauslaßöffnungen 71 abzuheben, so daß im Betrieb der Radialkolbenpumpe 1 sehr geringe Druckpulsationen gegeben sind.Since the material of the support ring 63 and thus the sealing plate 67 can be made very thin, the mass of the sealing plate is very small. It therefore requires a relatively small pulse to lift the sealing plate 67 from the pressure outlet openings 71, so that there are very low pressure pulsations during operation of the radial piston pump 1.

Es ist auch ersichtlich, daß die aus den Druckauslaßöffnungen 71 ausströmende Flüssigkeit ungehindert austreten kann und bei abgehobenen Dichtplättchen 67 aus der C-förmigen Ausnehmung 65 ausströmen kann. Daher werden bei dem Ausströmen der Flüssigkeit aus den Druckauslaßöffnungen 71 sehr wenig Wirbel induziert, so daß also die Geräuschentwicklung beim Ausströmen der unter hohem Druck stehenden Flüssigkeit minimiert ist. Auch ein Ventilklappern, hervorgerufen durch ein heftiges Aufschlagen des Dichtelements auf den Sitz, was zum Beispiel bei Kugelsitzventilen sehr laut ist, tritt hier aufgrund der sehr geringen Masse nicht auf.It can also be seen that the liquid flowing out of the pressure outlet openings 71 can escape unhindered and can flow out of the C-shaped recess 65 when the sealing plate 67 is lifted off. Therefore, very little eddy is induced when the liquid flows out of the pressure outlet openings 71, so that the noise development when the liquid under high pressure flows out is minimized. Valve rattling, caused by the sealing element violently hitting the seat, which is very loud, for example, with ball seat valves, does not occur here due to the very low mass.

Daran zeigt sich, daß die Radialkolbenpumpe 1 so ausgebildet ist, daß auf der Hochdruckseite geringe Druckpulsationen induziert und eine Geräuschentwicklung aufgrund von Wirbeln minimiert wird.This shows that the radial piston pump 1 is designed so that small on the high pressure side Pressure pulsations are induced and noise due to eddies is minimized.

Durch das aus Figur 1 ersichtliche Bauprinzip der Radialkolbenpumpe 1 wird nur ein sehr geringer Teil des Pumpengehäuses 3 mit unter Hochdruck stehendem Fluid beaufschlagt. Es ist ersichtlich, daß die Drucknut 57 sehr geringe Ausmaße aufweist. Restliche Pulsationen im Bereich der Drucknut 57 können also nur geringe Schwingungen auf das Pumpengehäuse 3 übertragen, so daß auch hier die Geräuschentwicklung auf ein Minimum reduziert ist.Due to the construction principle of the radial piston pump 1 shown in FIG. 1, only a very small part of the pump housing 3 is acted upon by fluid under high pressure. It can be seen that the pressure groove 57 has very small dimensions. Remaining pulsations in the area of the pressure groove 57 can therefore transmit only slight vibrations to the pump housing 3, so that the noise development is also reduced to a minimum here.

Die Drucknut 57 ist, wie Figur 1 zeigt, mit einem üblichen Auslaß 73 verbunden, der, wie durch einen Pfeil angedeutet, zu einem geeigneten Verbraucher führt.As shown in FIG. 1, the pressure groove 57 is connected to a conventional outlet 73 which, as indicated by an arrow, leads to a suitable consumer.

Es hat sich herausgestellt, daß die anhand der Figuren 1 bis 3 erläuterte Radialkolbenpumpe 1 sich durch eine sehr geringe Geräuschentwicklung auch dann auszeichnet, wenn sie für die Förderung von Flüssigkeit herangezogen wird die unter einem sehr hohen Druck von über 100 bar, aber auch von bis Zu 200 bar eingesetzt wird.It has been found that the radial piston pump 1 explained with reference to Figures 1 to 3 is characterized by a very low noise, even if it is used for the conveyance of liquid under a very high pressure of over 100 bar, but also from to Is used at 200 bar.

Wesentlich ist, daß der Bereich der Radialkolbenpumpe 1 in dem unter hohem Druck stehende Flüssigkeit vorhanden ist, also insbesondere der Kolbenring 27, vollständig abgekapselt im Inneren des Pumpengehäuses 3 angeordnet ist und zusätzlich von einer Flüssigkeit umgeben ist, die unter einem geringen Druck steht. Schwingungen und Geräusche vom Kolbenring 27 werden also nur zu einem sehr geringen Anteil an die Umgebung der Radialkolbenpumpe 1 abgegeben. Eine Abschirmung der Geräuschquelle der Pumpe wird auch noch dadurch bewirkt, daß der Kolbenring 27 durch einen massiven Wandbereich des Pumpengehäuses 3, nämlich durch den Ringwandbereich 43, vollständig umschlossen wird. Zusätzlich werden die zur Befestigung des Kolbenrings 27 erforderlichen Kräfte im Inneren des Pumpengehäuses 3 in den Grundkörper 5 eingeleitet, so daß keine Schwingungen auf freistehende Gehäusebereiche, zum Beispiel auf den Ringwandbereich 43, übertragen werden.It is essential that the area of the radial piston pump 1 is present in the liquid under high pressure, that is to say in particular the piston ring 27, is completely encapsulated in the interior of the pump housing 3 and is additionally surrounded by a liquid which is under a low pressure. Vibrations and noises from Piston ring 27 are therefore only released to a very small extent to the surroundings of the radial piston pump 1. The noise source of the pump is also shielded by the fact that the piston ring 27 is completely enclosed by a solid wall area of the pump housing 3, namely by the ring wall area 43. In addition, the forces required for fastening the piston ring 27 are introduced inside the pump housing 3 into the base body 5, so that no vibrations are transmitted to free-standing housing areas, for example to the ring wall area 43.

Entscheidend ist dabei auch, daß der Aufbau der Radialkolbenpumpe 1 einfach und kompakt ist.It is also crucial that the structure of the radial piston pump 1 is simple and compact.

Claims (16)

Radialkolbenpumpe mit einer in einem Pumpengehäuse gelagerten, einen Exzenter umfassenden Welle, mit einem feststehenden, die in radialer Richtung zur Welle angeordneten Kolben aufnehmenden, den Exzenter umgebenden Kolbenring, der mit zum Exzenter offenen Bohrungen zur Aufnahme der Kolben versehen ist, die an ihren dem Exzenter abgewandten Enden mit jeweils einem Verschlußstopfen abgeschlossen sind, dadurch gekennzeichnet, daß der Kolbenring (27) vom Pumpengehäuse (3) so umschlossen ist, daß zumindest zwischen den Verschlußstopfen (37) und der Innenseite des Pumpengehäuses (3) ein flüssigkeitsgefüllter Raum (45) gegeben ist.Radial piston pump with a shaft mounted in a pump housing and comprising an eccentric, with a fixed piston ring which accommodates the pistons arranged in the radial direction of the shaft and surrounds the eccentric, which is provided with bores open to the eccentric for receiving the pistons which are attached to the eccentric opposite ends are each closed with a sealing plug, characterized in that the piston ring (27) is enclosed by the pump housing (3) in such a way that at least between the sealing plug (37) and the inside of the pump housing (3) there is a liquid-filled space (45) is. Radialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der flüssigkeitsgefüllte Raum (45) als Ringraum ausgebildet ist, der den Kolbenring (27) vollständig umgibt.Radial piston pump according to claim 1, characterized in that the liquid-filled space (45) is designed as an annular space which completely surrounds the piston ring (27). Radialkolbenpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Flüssigkeit im Raum (45) nicht oder nur unter einem geringen Überdruck steht.Radial piston pump according to claim 1 or 2, characterized in that the liquid in the room (45) is not or only under a slight positive pressure. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Flüssigkeit im Raum (45) mit der Saugseite der Radialkolbenpumpe (1) in Verbindung steht.Radial piston pump according to one of the preceding claims, characterized in that the liquid in the space (45) is connected to the suction side of the radial piston pump (1). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Pumpengehäuse (3) zweiteilig ausgebildet ist.Radial piston pump according to one of the preceding claims, characterized in that the pump housing (3) is constructed in two parts. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Pumpengehäuse (3) einen Grundkörper (5) aufweist, der die Lagerkräfte der Welle (9) aufnimmt.Radial piston pump according to one of the preceding claims, characterized in that the pump housing (3) has a base body (5) which absorbs the bearing forces of the shaft (9). Radialkolbenpumpe nach Anspruch 6, dadurch gekennzeichnet, daß der Kolbenring (27) am Grundkörper (5) angebracht ist.Radial piston pump according to claim 6, characterized in that the piston ring (27) is attached to the base body (5). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Grundkörper (5) einen Ringwandbereich (43) aufweist, der den Kolbenring (27) umgibt.Radial piston pump according to one of the preceding claims, characterized in that the base body (5) has an annular wall region (43) which surrounds the piston ring (27). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Pumpengehäuse (3) einen vorzugsweise dünnwandigen Deckel (7) aufweist.Radial piston pump according to one of the preceding claims, characterized in that the pump housing (3) has a preferably thin-walled cover (7). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kolbenring (27) Druckauslaßöffnungen (71) aufweist, denen ein vorzugsweise durchgehender Tragring (63) einer Dichtungseinrichtung (61) zugeordnet ist, der mit Dichtplättchen (67) versehen ist, die die Druckauslaßöffnungen (71) abschließen.Radial piston pump according to one of the preceding claims, characterized in that the piston ring (27) has pressure outlet openings (71), to which a preferably continuous support ring (63) of a sealing device (61) is assigned, which is provided with sealing plates (67) which close off the pressure outlet openings (71). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Dichtplättchen (67) über Federstege (69) mit dem Tragring (63) verbunden sind.Radial piston pump according to one of the preceding claims, characterized in that the sealing plates (67) are connected to the support ring (63) via spring bars (69). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Tragring (63) als Stanzteil ausgebildet ist und/oder vorzugsweise aus Metall besteht.Radial piston pump according to one of the preceding claims, characterized in that the support ring (63) is designed as a stamped part and / or preferably consists of metal. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Pumpengehäuse (3) so ausgebildet ist, daß die unter Hochdruck stehende, von der Radialkolbenpumpe (1) geförderte Flüssigkeit von einer im Pumpengehäuse (3) vorgesehenen Drucknut (57) aufgenommen wird.Radial piston pump according to one of the preceding claims, characterized in that the pump housing (3) is designed such that the liquid under high pressure, which is delivered by the radial piston pump (1), is received by a pressure groove (57) provided in the pump housing (3). Radialkolbenpumpe nach Anspruch 13, dadurch gekennzeichnet, daß die Drucknut (57) sehr viel kleiner ausgebildet ist als die mit der Saugseite der Radialkolbenpumpe (1) kommunizierenden Kammern im Pumpengehäuse (3).Radial piston pump according to claim 13, characterized in that the pressure groove (57) is made much smaller than the chambers in the pump housing (3) communicating with the suction side of the radial piston pump (1). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß alle Hochdruckdichtungen nach außen hin über Niederdruckdichtungen abgesichert sind und damit keine nach außen dichtende Hochdruckdichtung vorgesehen ist.Radial piston pump according to one of the preceding claims, characterized in that all high-pressure seals on the outside via low-pressure seals are secured and therefore no outward sealing high pressure seal is provided. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zwei oder drei nach außen dichtende Dichtungen vorgesehen sind, die alle gegen Niederdruck abdichten.Radial piston pump according to one of the preceding claims, characterized in that two or three outwardly sealing seals are provided, all of which seal against low pressure.
EP96107585A 1995-05-13 1996-05-13 Radial piston pump Expired - Lifetime EP0745771B1 (en)

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GB2277558A (en) * 1993-04-28 1994-11-02 Barmag Luk Automobiltech Hydraulic pump outlet valves

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2310256A (en) * 1996-02-16 1997-08-20 Zahnradfabrik Friedrichshafen Noise reduction of radial piston pumps
GB2310256B (en) * 1996-02-16 1999-04-14 Zahnradfabrik Friedrichshafen Radial piston pump
CN103174618A (en) * 2013-03-29 2013-06-26 西安交通大学 Radial plunger hydraulic pump of double-acting type outer rotor
CN103174618B (en) * 2013-03-29 2015-05-13 西安交通大学 Radial plunger hydraulic pump of double-acting type outer rotor
CN104389754A (en) * 2014-09-17 2015-03-04 西安交通大学 Hydraulic compensated radial plunger pump adopting manner of valve plate flow distribution
CN104389754B (en) * 2014-09-17 2015-12-02 西安交通大学 A kind of compensation hydraulic formula radial plunger pump of end face oil distributing
WO2022013062A1 (en) * 2020-07-13 2022-01-20 Thyssenkrupp Presta Teccenter Ag Radial piston pump

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JP4227674B2 (en) 2009-02-18
JPH09100776A (en) 1997-04-15
DE59608339D1 (en) 2002-01-17
US5716198A (en) 1998-02-10
DE19517628A1 (en) 1996-11-14
EP0745771B1 (en) 2001-12-05

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