EP0795086B1 - Vane pump - Google Patents

Vane pump Download PDF

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Publication number
EP0795086B1
EP0795086B1 EP95936531A EP95936531A EP0795086B1 EP 0795086 B1 EP0795086 B1 EP 0795086B1 EP 95936531 A EP95936531 A EP 95936531A EP 95936531 A EP95936531 A EP 95936531A EP 0795086 B1 EP0795086 B1 EP 0795086B1
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EP
European Patent Office
Prior art keywords
suction
drive shaft
control valve
channel
vane pump
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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
Application number
EP95936531A
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German (de)
French (fr)
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EP0795086A1 (en
Inventor
Johann Merz
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ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00Control; Monitoring or safety arrangements
    • F04C2270/05Speed
    • F04C2270/052Speed angular
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00Control; Monitoring or safety arrangements
    • F04C2270/20Flow
    • F04C2270/205Controlled or regulated

Definitions

  • the invention relates to a vane pump with a in a housing mounted cam ring and a through a drive shaft drivable rotor with radial slots.
  • Working slides are inserted in the radial slots, that glide along the curve ring.
  • the rotor and the working valves formed by control plates in axial Direction are limited.
  • the housing is on the one hand from Delivery pressure and on the other hand the outlet pressure plus one Spring-loaded flow control valve installed, the a connection from a pressure chamber to one with the Can connect connected suction channel.
  • a suction channel in two symmetrical leading to suction zones arranged, curved suction arms divided into the end wall of a housing.
  • Such a vane pump is for example known from US-PS 5 112 199.
  • This pump has two from Flow control valve outgoing and with the two suction zones connected spray channels.
  • the suction zones are also there still over two grooves with one below the flow control valve lying inlet bore in connection.
  • Such a thing System with two spray channels is relatively expensive.
  • these channels can pass through when the oil is sprayed off Tolerances have different effects. This means, that one of the two suction zones charges only with a delay. Due to the different filling of the suction zones Noises arise.
  • the invention is therefore based on the object To improve the pump in its spray and suction area so that there is a favorable noise behavior even at high pump speeds results in low manufacturing costs.
  • Vane pump solved in that the suction channel in a distributor section located in the middle of the flow control valve opens from which the curved suction arms originate, the manifold section and the curved suction arms so are arranged that the drive shaft or its plain bearing bush acts as a current divider.
  • the spray channel of the Flow control valve opens in the middle of the distributor section.
  • the drive shaft forms their contour in the course of the distributor section and on a partial length of the suction arms the inner channel wall.
  • the on the flow control valve via the spray channel into the distributor section regulated oil hits the drive shaft and flows over on both sides of the shaft without great resistance the curved suction arms into the suction zones. Since only one spray channel lies in the center of the distributor section the oil is distributed evenly over the suction zones.
  • the Drive shaft as a current divider has another advantage: Because the flow control valve at high speed regulated oil hits the hard steel drive shaft, there can be no cavitation or abrasion at this point occur. When the duct walls are made Die casting, which usually consists of the entire housing, would be such wear in the sensitive distributor area not be ruled out.
  • a Slide bearing bush of the drive shaft designed as a current divider, with the plain bearing bushing approximately up to the inner one Control plate extends. Since the plain bearing bush as Two-substance store is executed, the stripping beam hits the Spray hole in turn on the hard steel outer jacket the socket.
  • the bore of the flow control valve starting from a pressure chamber by about 15 ° to the drive shaft be inclined. This measure results in a favorable spray angle and thus a better efficiency (charging) of the restricted oil.
  • the leak oil flows from the area of Rotors directly to the suction zones via the suction arms. This measure allows a lubrication groove to be returned save the oil in the slide bearing of the drive shaft.
  • the vane pump is used to deliver pressure oil a container, not shown, to a container, not shown Consumers, for example an auxiliary steering system.
  • the rotor set 3 consists of a cam ring 4 and a rotor 5.
  • the rotor 5 is arranged in the interior of the cam ring 4 and has radially directed slots in which wings 6 are movable. Between the cam ring, the rotor 5 and the wings 6 are working chambers formed by control surfaces adjacent control plates 7 and 8 in the axial direction are limited.
  • the pump corresponds to a double stroke Execution.
  • the housing 2 is composed of a bearing housing 10 and a Pot-shaped housing cover 11 assembled.
  • the rotor 5 sits rotatably on a drive shaft 12, which is in the Bearing housing 10 supports.
  • the bearing in the bearing housing 10 is the only bearing of the drive shaft 12. This means that the drive shaft 12 in the housing cover 11 is not supported in the radial direction.
  • the drive shaft rather is based on the housing cover 11 in axial direction.
  • a flow control valve 13 for the control of the the pressure connection led pressure oil provided.
  • Training the flow control valve 13 and one more existing, not visible pressure relief valve generally known, for example from US Pat. No. 5,098,259 and is therefore not described in detail.
  • they are Pressure channels that connect the working chambers with the flow control valve 13 and connect the pressure relief valve in which Bearing housing 10 arranged. These channels are also general known and are therefore not described in detail.
  • the control plate 7 has a throttle 14 and one Breakthrough 14A.
  • the throttle and the breakthrough are available between the rotor 5, the cam ring 4 and the Wings 6 formed pressure-carrying working chambers in connection.
  • the delivery pressure prevails in pressure chamber 1.
  • Breakthrough 14A closes axially a piston bore 15 of the flow control valve 13 on.
  • the piston bore 15 contains a control piston 17, on the one inserted into a spring chamber 15A Spring 16 presses.
  • the piston bore 15 is over a bore with the outlet channel 19 in connection. How best 2 shows a suction channel 18 via a distributor section 20 and two curved Suction arms 21 and 22 in connection with suction zones 23 and 24, respectively.
  • the suction zones 23 and 24 form the inlets in a known manner between the Wing 6 lying working chambers of the pump.
  • the distributor section 20 is centrally below of the flow control valve 13.
  • the manifold section 20 and the Suction arms 23 and 24 are arranged so that the drive shaft 12 acts as a current divider.
  • the drive shaft thus forms part of the inner channel wall.
  • To the invention also belongs in the middle of the distributor section 20 opening spray channel 25 of the flow control valve 13.
  • the control piston 17 controls the discharge channel 25 Flow control valve 13 promoted at higher speeds Excess current in the suction zones 23, 24.
  • the drive shaft 12 is supported in a plain bearing bush 26.
  • the one that acts as a current divider Bushing 26 is designed as a two-substance store, i. H., the outer jacket consists, for. B. made of steel, while the inner surface is made of non-ferrous metal.
  • the same results here Advantages as already mentioned in connection with FIG. 1. Is left between the end plate 7 and the plain bearing bush 26 a small gap "S" free, so can this gap the leak oil in turn from the area of Rotor 5 the suction arms 21, 22 and thus the suction zones 23, 24 flow.
  • the flow control valve 13 works as follows: With increasing speed, the differential pressure increases because of the throttle 14 on the end face of the control piston 22 facing the opening 14A.
  • the control piston 22 acts as a pressure compensator and moves to the left against the force of a spring 23 and against the force of the outlet pressure behind the control piston. In this case, the end face of the control piston 22 opens the spray channel 25. A partial flow thus reaches the feed side of the pump in a known manner. A horizontal or falling useful current characteristic is thus obtained.

Abstract

The invention concerns a vane pump with a flow-control valve (13) on whose plunger (17) the feed and delivery pressures act as well as the force of a spring. The plunger (17) works as a pressure regulator, the difference in pressure when the pump speed is increasing being used as the control parameter for the amount pumped away. The flow pumped away by the plunger (17) is injected through a spray channel (25) into a distributor zone (20) connected by curved suction arms (21 and 22) to suction zones (23 and 24, respectively). The main feature of the invention is that the distributor zone (20) and the suction arms (21 and 22) are fitted snugly on a drive shaft (12). The drive shaft (12) thus acts as a flow divider. In addition, the spray channel (25) opens out in the middle of the distributor zone (20) so that both the oil sprayed out and the oil aspirated in through a suction channel (18) are distributed uniformly over both suction zones (23 and 24). Since the pressure oil impacts on the drive shafts (12), which is made of a hard material, and passes along the shaft for part of its flow path, no cavitation or abrasion can occur in this region.

Description

Die Erfindung betrifft eine Flügelzellenpumpe mit einem in einem Gehäuse gelagerten Kurvenring und einem durch eine Antriebswelle antreibbaren Rotor mit radialen Schlitzen. In die radialen Schlitze sind Arbeitsschieber eingesetzt, die im Kurvenring dichtend entlanggleiten. Zwischen dem Kurvenring, dem Rotor und den Arbeitsschiebern sind Arbeitskammern gebildet, die durch Steuerplatten in axialer Richtung begrenzt sind. Im Gehäuse ist ein einerseits vom Förderdruck und andererseits vom Auslaßdruck plus einer Federkraft beaufschlagtes Stromregelventil eingebaut, das eine Verbindung von einer Druckkammer zu einem mit der Saugseite verbundenen Abspritzkanal herstellen kann. Außerdem ist ein Saugkanal in zwei zu Saugzonen geführte, symmetrisch angeordnete, gebogene Saugarme aufgeteilt, die in der Stirnwand eines Gehäuses liegen.The invention relates to a vane pump with a in a housing mounted cam ring and a through a drive shaft drivable rotor with radial slots. Working slides are inserted in the radial slots, that glide along the curve ring. Between the cam ring, the rotor and the working valves Working chambers formed by control plates in axial Direction are limited. In the housing is on the one hand from Delivery pressure and on the other hand the outlet pressure plus one Spring-loaded flow control valve installed, the a connection from a pressure chamber to one with the Can connect connected suction channel. Furthermore is a suction channel in two symmetrical leading to suction zones arranged, curved suction arms divided into the end wall of a housing.

Eine derartige Flügelzellenpumpe ist beispielsweise aus der US-PS 5 112 199 bekannt. Diese Pumpe hat zwei vom Stromregelventil abgehende und mit den beiden Saugzonen verbundene Abspritzkanäle. Die Saugzonen stehen außerdem noch über zwei Nuten mit einer unterhalb des Stromregelventils liegenden Einlaßbohrung in Verbindung. Ein derartiges System mit zwei Abspritzkanälen ist verhältnismäßig teuer. Außerdem können diese Kanäle beim Abspritzen des Öls durch Toleranzen unterschiedlich wirksam werden. Dies bedeutet, daß sich eine der beiden Saugzonen nur verzögert auflädt. Durch die unterschiedliche Befüllung der Saugzonen können Geräusche entstehen.Such a vane pump is for example known from US-PS 5 112 199. This pump has two from Flow control valve outgoing and with the two suction zones connected spray channels. The suction zones are also there still over two grooves with one below the flow control valve lying inlet bore in connection. Such a thing System with two spray channels is relatively expensive. In addition, these channels can pass through when the oil is sprayed off Tolerances have different effects. This means, that one of the two suction zones charges only with a delay. Due to the different filling of the suction zones Noises arise.

Der Erfindung liegt deshalb die Aufgabe zugrunde, die Pumpe in ihrem Abspritz- und Saugbereich so zu verbessern, daß sich auch bei hohen Pumpendrehzahlen ein günstiges Geräuschverhalten bei geringen Herstellungskosten ergibt.The invention is therefore based on the object To improve the pump in its spray and suction area so that there is a favorable noise behavior even at high pump speeds results in low manufacturing costs.

Diese Aufgabe ist durch die im Anspruch 1 gekennzeichnete Flügelzellenpumpe dadurch gelöst, daß der Saugkanal in einen mittig zum Stromregelventil liegenden Verteilerabschnitt mündet, von dem die gebogenen Saugarme ausgehen, wobei der Verteilerabschnitt und die gebogenen Saugarme so angeordnet sind, daß die Antriebswelle oder deren Gleitlagerbuchse als Stromteiler wirkt. Der Abspritzkanal des Stromregelventils mündet dabei mittig in den Verteilerabschnitt.This object is characterized by that in claim 1 Vane pump solved in that the suction channel in a distributor section located in the middle of the flow control valve opens from which the curved suction arms originate, the manifold section and the curved suction arms so are arranged that the drive shaft or its plain bearing bush acts as a current divider. The spray channel of the Flow control valve opens in the middle of the distributor section.

Nach dem Hauptmerkmal bildet die Antriebswelle mit ihrer Kontur im Verlauf des Verteilerabschnitts und auf einer Teillänge der Saugarme die innere Kanalwandung. Das am Stromregelventil über den Abspritzkanal in den Verteilerabschnitt abgeregelte Öl trifft auf die Antriebswelle und strömt beidseitig der Welle ohne große Widerstände über die gebogenen Saugarme in die Saugzonen ab. Da nur ein Abspritzkanal im Zentrum des Verteilerabschnitts liegt, läßt sich das Öl gleichmäßig auf die Saugzonen verteilen. Die Antriebswelle als Stromteiler hat noch einen weiteren Vorteil: Da das am Stromregelventil mit hoher Geschwindigkeit abgeregelte Öl auf die Antriebswelle aus hartem Stahl auftrifft, kann an dieser Stelle keine Kavitation bzw. Abrasion auftreten. Bei einer Ausführung der Kanalwandungen aus Druckguß, aus welchem in der Regel das gesamte Gehäuse besteht, wäre ein derartiger Verschleiß im empfindlichen Verteilerbereich nicht auszuschließen.According to the main feature, the drive shaft forms their contour in the course of the distributor section and on a partial length of the suction arms the inner channel wall. The on the flow control valve via the spray channel into the distributor section regulated oil hits the drive shaft and flows over on both sides of the shaft without great resistance the curved suction arms into the suction zones. Since only one spray channel lies in the center of the distributor section the oil is distributed evenly over the suction zones. The Drive shaft as a current divider has another advantage: Because the flow control valve at high speed regulated oil hits the hard steel drive shaft, there can be no cavitation or abrasion at this point occur. When the duct walls are made Die casting, which usually consists of the entire housing, would be such wear in the sensitive distributor area not be ruled out.

Zweckmäßige und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. Die Erfindung ist jedoch nicht auf die Merkmalskombinationen der Ansprüche beschränkt. Für den Fachmann ergeben sich weitere sinnvolle Kombinationsmöglichkeiten von Ansprüchen und einzelnen Anspruchsmerkmalen aus der Aufgabenstellung.Useful and advantageous embodiments of the invention are specified in the subclaims. The invention however, is not based on the combinations of features Claims limited. There are more for the person skilled in the art reasonable combinations of claims and individual Claim characteristics from the task.

In einer Ausführungsform nach Anspruch 2 ist eine Gleitlagerbuchse der Antriebswelle als Stromteiler ausgeführt, wobei sich die Gleitlagerbuchse etwa bis zu der inneren Steuerplatte erstreckt. Da die Gleitlagerbuchse als Zweistofflager ausgeführt ist, trifft der Abregelstrahl der Abspritzbohrung wiederum auf den harten Stahlaußenmantel der Buchse.In one embodiment according to claim 2 is a Slide bearing bush of the drive shaft designed as a current divider, with the plain bearing bushing approximately up to the inner one Control plate extends. Since the plain bearing bush as Two-substance store is executed, the stripping beam hits the Spray hole in turn on the hard steel outer jacket the socket.

Nach Anspruch 3 kann die Bohrung des Stromregelventils von einem Druckraum ausgehend um etwa 15° zur Antriebswelle hin geneigt sein. Diese Maßnahme ergibt einen günstigen Abspritzwinkel und damit einen besseren Wirkungsgrad (Aufladung) des abgeregelten Öls.According to claim 3, the bore of the flow control valve starting from a pressure chamber by about 15 ° to the drive shaft be inclined. This measure results in a favorable spray angle and thus a better efficiency (charging) of the restricted oil.

Nach Anspruch 4 fließt das Lecköl aus dem Bereich des Rotors über die Saugarme unmittelbar den Saugzonen zu. Durch diese Maßnahme läßt sich eine Schmiernut zur Rückführung des Öls im Gleitlager der Antriebswelle einsparen.According to claim 4, the leak oil flows from the area of Rotors directly to the suction zones via the suction arms. This measure allows a lubrication groove to be returned save the oil in the slide bearing of the drive shaft.

Nachfolgend ist die Erfindung anhand der Zeichnung an mehreren Ausführungsbeispielen näher erläutert. The invention is based on the drawing several embodiments explained in more detail.

Es zeigen:

Fig. 1
einen Längsschnitt durch eine erfindungsgemäße Flügelzellenpumpe;
Fig. 2
eine Draufsicht nach der Linie II-II in Fig. 1;
Fig. 3
einen Teil-Längsschnitt durch eine Ausführungsform mit einer in einer Gleitlagerbuchse gelagerten Antriebswelle;
Fig. 4
den Querschnitt nach der Linie IV-IV in Fig. 3 und
Fig. 5
einen Teil-Längsschnitt durch eine weitere Ausführungsform mit einem quer angeordneten Stromregelventil.
Show it:
Fig. 1
a longitudinal section through a vane pump according to the invention;
Fig. 2
a plan view along the line II-II in Fig. 1;
Fig. 3
a partial longitudinal section through an embodiment with a drive shaft mounted in a plain bearing bush;
Fig. 4
the cross section along the line IV-IV in Fig. 3 and
Fig. 5
a partial longitudinal section through a further embodiment with a transverse flow control valve.

Die Flügelzellenpume dient zum Fördern von Drucköl aus einem nicht dargestellten Behälter zu einem nicht dargestellten Verbraucher, beispielsweise einer Hilfskraftlenkung.The vane pump is used to deliver pressure oil a container, not shown, to a container, not shown Consumers, for example an auxiliary steering system.

In Fig. 1 und 2 ist in einem ölgefüllten Druckraum 1 eines Gehäuses 2 ein Rotorensatz 3 eingesetzt. Der Rotorensatz 3 besteht aus einem Kurvenring 4 und einem Rotor 5. Der Rotor 5 ist im Inneren des Kurvenringes 4 angeordnet und weist radial gerichtete Schlitze auf, in denen Flügel 6 verschiebbar sind. Zwischen dem Kurvenring, dem Rotor 5 und den Flügeln 6 sind Arbeitskammern gebildet, die von Steuerflächen benachbarter Steuerplatten 7 und 8 in axialer Richtung begrenzt sind. Die Pumpe entspricht einer doppelhubigen Ausführung. 1 and 2 is 1 in an oil-filled pressure chamber a housing 2, a rotor set 3 is used. The rotor set 3 consists of a cam ring 4 and a rotor 5. The rotor 5 is arranged in the interior of the cam ring 4 and has radially directed slots in which wings 6 are movable. Between the cam ring, the rotor 5 and the wings 6 are working chambers formed by control surfaces adjacent control plates 7 and 8 in the axial direction are limited. The pump corresponds to a double stroke Execution.

Das Gehäuse 2 ist aus einem Lagergehäuse 10 und einem topfförmigen Gehäusedeckel 11 zusammengesetzt. Der Rotor 5 sitzt drehfest auf einer Antriebswelle 12, die sich in dem Lagergehäuse 10 abstützt. Die Lagerstelle in dem Lagergehäuse 10 ist die einzige Lagerung der Antriebswelle 12. Dies bedeutet, daß die Antriebswelle 12 in dem Gehäusedekkel 11 in radialer Richtung nicht gelagert ist. Die Antriebswelle stützt sich vielmehr an dem Gehäusedeckel 11 in axialer Richtung ab.The housing 2 is composed of a bearing housing 10 and a Pot-shaped housing cover 11 assembled. The rotor 5 sits rotatably on a drive shaft 12, which is in the Bearing housing 10 supports. The bearing in the bearing housing 10 is the only bearing of the drive shaft 12. This means that the drive shaft 12 in the housing cover 11 is not supported in the radial direction. The drive shaft rather is based on the housing cover 11 in axial direction.

Neben einem nicht sichtbaren Sauganschluß für den Anschluß des Behälters sowie einem gleichfalls nicht sichtbaren Druckanschluß für den Verbraucher ist in dem Lagergehäuse 10 ein Stromregelventil 13 für die Regelung des zu dem Druckanschluß geführten Drucköls vorgesehen. Die Ausbildung des Stromregelventils 13 und eines außerdem noch vorhandenen, nicht sichtbaren Druckbegrenzungsventils ist allgemein bekannt, beispielsweise aus der US-PS 5 098 259 und wird daher nicht näher beschrieben. Ebenso sind die Druckkanäle, die die Arbeitskammern mit dem Stromregelventil 13 und dem Druckbegrenzungsventil verbinden, in dem Lagergehäuse 10 angeordnet. Auch diese Kanäle sind allgemein bekannt und werden deshalb nicht näher beschrieben.In addition to an invisible suction connection for the connection of the container and one that is also not visible Pressure connection for the consumer is in the bearing housing 10 a flow control valve 13 for the control of the the pressure connection led pressure oil provided. Training the flow control valve 13 and one more existing, not visible pressure relief valve generally known, for example from US Pat. No. 5,098,259 and is therefore not described in detail. Likewise, they are Pressure channels that connect the working chambers with the flow control valve 13 and connect the pressure relief valve in which Bearing housing 10 arranged. These channels are also general known and are therefore not described in detail.

Die Steuerplatte 7 hat eine Drossel 14 und einen Durchbruch 14A. Die Drossel und der Durchbruch stehen mit den zwischen dem Rotor 5, dem Kurvenring 4 und den Flügeln 6 gebildeten druckführenden Arbeitskammern in Verbindung. Im Druckraum 1 herrscht dabei der Förderdruck. Der Förderdruck wird über die Drossel 14 und einen Auslaßkanal 19 dem Verbraucher zugeführt. An den Durchbruch 14A schließt axial eine Kolbenbohrung 15 des Stromregelventils 13 an. Die Kolbenbohrung 15 enthält einen Regelkolben 17, auf den eine in einen Federraum 15A eingesetzte Feder 16 drückt. Die Kolbenbohrung 15 steht über eine Bohrung mit dem Auslaßkanal 19 in Verbindung. Wie am besten die Draufsicht nach Fig. 2 erkennen läßt, steht ein Saugkanal 18 über einen Verteilerabschnitt 20 und zwei gebogene Saugarme 21 und 22 mit Saugzonen 23 bzw. 24 in Verbindung. Es ist für die Strömung günstig, den an den Behälter angeschlossenen Saugkanal 18 im Zentrum des Verteilerabschnitts 20 einmünden zu lassen. Die Saugzonen 23 und 24 bilden in bekannter Weise die Einlässe in die zwischen den Flügeln 6 liegenden Arbeitskammern der Pumpe. Nach der Erfindung liegt der Verteilerabschnitt 20 mittig unterhalb des Stromregelventils 13. Der Verteilerabschnitt 20 und die Saugarme 23 und 24 sind so angeordnet, daß die Antriebswelle 12 als Stromteiler wirkt. Die Antriebswelle bildet somit einen Teil der innenliegenden Kanalwandung. Zur Erfindung gehört außerdem noch ein mittig in den Verteilerabschnitt 20 einmündender Abspritzkanal 25 des Stromregelventils 13. Über den Abspritzkanal 25 regelt der Regelkolben 17 des Stromregelventils 13 den bei höheren Drehzahlen geförderten Überschußstrom in die Saugzonen 23, 24 ab. Da die Antriebswelle 12 die innere Kanalwandung des Verteilerabschnitts 20 und der Saugarme 21, 22 bildet, erhält man eine strömungsgünstige Kanalführung mit guter Aufladewirkung und mit einer gleichmäßigen Aufteilung des gesamten Ansaugstromes. Der über den Abspritzkanal 25 in den Verteilerabschnitt 20 einschießende Strahl reißt dabei das über den Saugkanal 18 herangeführte Öl mit, wodurch sich die Aufladung zusätzlich verbessert. Hierbei ist es vorteilhaft, wenn der Abspritzkanal 25 zum Verteilerabschnitt 20 hin geneigt ist (Fig. 1), damit der mit hoher Geschwindigkeit in den Abspritzkanal 25 eintretende Strahl nicht auf die Kanalwandung, sondern auf die aus hartem Material gefertigte Antriebswelle 12 auftrifft. Dadurch läßt sich Kavitation und Abrasion im Abspritzkanal 25 vermeiden. Das Lecköl aus dem Bereich des Rotors 5 läßt sich zweckmäßig über die Saugarme 21, 22 unmittelbar in die Saugzonen 23, 24 zurückführen. The control plate 7 has a throttle 14 and one Breakthrough 14A. The throttle and the breakthrough are available between the rotor 5, the cam ring 4 and the Wings 6 formed pressure-carrying working chambers in connection. The delivery pressure prevails in pressure chamber 1. Of the Delivery pressure is via the throttle 14 and an outlet channel 19 fed to the consumer. Breakthrough 14A closes axially a piston bore 15 of the flow control valve 13 on. The piston bore 15 contains a control piston 17, on the one inserted into a spring chamber 15A Spring 16 presses. The piston bore 15 is over a bore with the outlet channel 19 in connection. How best 2 shows a suction channel 18 via a distributor section 20 and two curved Suction arms 21 and 22 in connection with suction zones 23 and 24, respectively. It is favorable for the flow that is connected to the container Suction channel 18 in the center of the distributor section 20 to flow. The suction zones 23 and 24 form the inlets in a known manner between the Wing 6 lying working chambers of the pump. According to the invention the distributor section 20 is centrally below of the flow control valve 13. The manifold section 20 and the Suction arms 23 and 24 are arranged so that the drive shaft 12 acts as a current divider. The drive shaft thus forms part of the inner channel wall. To the invention also belongs in the middle of the distributor section 20 opening spray channel 25 of the flow control valve 13. The control piston 17 controls the discharge channel 25 Flow control valve 13 promoted at higher speeds Excess current in the suction zones 23, 24. Because the drive shaft 12 the inner channel wall of the distributor section 20 and the suction arms 21, 22 forms, you get a streamlined Channel guide with good charging effect and with one even distribution of the total intake flow. The via the spray channel 25 in the distributor section 20th the incoming jet tears it via the suction channel 18 brought in oil, which increases the charge improved. It is advantageous if the spray channel 25 is inclined towards the distributor section 20 (Fig. 1), so that at high speed in the spray channel 25 incoming beam not on the channel wall, but on the drive shaft made of hard material 12 hits. This allows cavitation and Avoid abrasion in spray channel 25. The leak oil from the The area of the rotor 5 can be expediently via the suction arms 21, 22 lead directly back into the suction zones 23, 24.

In den Fig. 3 und 4 stützt sich die Antriebswelle 12 in einer Gleitlagerbuchse 26 ab. Die als Stromteiler wirkende Buchse 26 ist als Zweistofflager ausgeführt, d. h., der Außenmantel besteht z. B. aus Stahl, während die Innenfläche aus Buntmetall gefertigt ist. Hier ergeben sich dieselben Vorteile wie bereits in Verbindung mit Fig. 1 erwähnt. Läßt man zwischen der Stirnplatte 7 und der Gleitlagerbuchse 26 einen kleinen Spalt "S" frei, so kann durch diesen Spalt das Lecköl wiederum aus dem Bereich des Rotors 5 den Saugarmen 21, 22 und damit den Saugzonen 23, 24 zufließen.3 and 4, the drive shaft 12 is supported in a plain bearing bush 26. The one that acts as a current divider Bushing 26 is designed as a two-substance store, i. H., the outer jacket consists, for. B. made of steel, while the inner surface is made of non-ferrous metal. The same results here Advantages as already mentioned in connection with FIG. 1. Is left between the end plate 7 and the plain bearing bush 26 a small gap "S" free, so can this gap the leak oil in turn from the area of Rotor 5 the suction arms 21, 22 and thus the suction zones 23, 24 flow.

In Fig. 5 ist eine weitere Variante dargestellt, in welcher die Kolbenbohrung 15 des Stromregelventils 13 von dem Druckraum 1 ausgehend um etwa 15° zur Antriebswelle 12 hin geneigt ist. Diese Maßnahme hat den Vorteil, daß der Abspritzkanal beim Öffnen durch den Regelkolben 17 in einem weiten Bereich parallel oder nahezu parallel zum Abspritzkanal 25 gerichtet ist und der Ölstrahl auf die kavitationsresistente Antriebswelle 12 trifft.5 shows a further variant, in which the piston bore 15 of the flow control valve 13 of the pressure chamber 1 starting from about 15 ° to the drive shaft 12 is inclined. This measure has the advantage that the Spray channel when opened by the control piston 17 in one wide range parallel or almost parallel to the spray channel 25 is directed and the oil jet on the cavitation resistant Drive shaft 12 hits.

Das Stromregelventil 13 arbeitet wie folgt:
Mit steigender Drehzahl nimmt der Differenzdruck wegen der Drossel 14 auf die dem Durchbruch 14A zugewandte Stirnfläche des Regelkolbens 22 zu. Der Regelkolben 22 wirkt als Druckwaage und verschiebt sich gegen die Kraft einer Feder 23 und gegen die Kraft des hinter dem Regelkolben herrschenden Auslaßdruckes nach links. Dabei öffnet die Stirnfläche des Regelkolbens 22 den Abspritzkanal 25. Ein Teilstrom gelangt somit in bekannter Weise wieder auf die Zulaufseite der Pumpe. Man erhält somit eine waagerechte oder fallende Nutzstromkennlinie.
The flow control valve 13 works as follows:
With increasing speed, the differential pressure increases because of the throttle 14 on the end face of the control piston 22 facing the opening 14A. The control piston 22 acts as a pressure compensator and moves to the left against the force of a spring 23 and against the force of the outlet pressure behind the control piston. In this case, the end face of the control piston 22 opens the spray channel 25. A partial flow thus reaches the feed side of the pump in a known manner. A horizontal or falling useful current characteristic is thus obtained.

BezugszeichenReference numerals

11
DruckraumPressure room
22nd
Gehäusecasing
33rd
RotorsatzRotor set
44th
KurvenringCurve ring
55
Rotorrotor
66
Flügelwing
77
SteuerplatteControl plate
88th
SteuerplatteControl plate
99
SaugkanalSuction channel
1010th
LagergehäuseBearing housing
1111
GehäusedeckelHousing cover
1212th
Antriebswelledrive shaft
1313
StromregelventilFlow control valve
1414
Durchbruchbreakthrough
14A14A
Durchbruchbreakthrough
1515
KolbenbohrungPiston bore
15A15A
FederraumSpring chamber
1616
Federfeather
1717th
RegelkolbenControl piston
1818th
SaugkanalSuction channel
1919th
AuslaßkanalExhaust duct
2020th
VerteilerabschnittDistribution section
2121
SaugarmSuction arm
2222
SaugarmSuction arm
2323
SaugzoneSuction zone
2424th
SaugzoneSuction zone
2525th
AbspritzkanalSpray channel
2626
GleitlagerbuchsePlain bearing bush
2727
Bohrungdrilling
"S""S"
Spaltgap

Claims (4)

  1. Vane pump having the following features:
    a cam ring (4) is supported in a housing (2);
    a rotor (5) drivable by a drive shaft (12) has radial slots, into which are inserted working slides (6) which slide sealingly along the cam ring (4);
    formed between the cam ring (4), the rotor (5) and the working slides (6) are working chambers which are delimited in an axial direction by control plates (7, 8);
    installed in the housing is a flow control valve (13), which is acted upon on the one hand by the delivery pressure and on the other hand by the discharge pressure plus a spring force and which may establish a connection from a pressure chamber (1) to a spray channel (25);
    a suction channel (18) is divided into symmetrically arranged, curved suction arms (21, 22), which lead to suction zones (23, 24) and are situated in an end wall of the housing,
    characterized by the following features:
    the suction channel (18) opens into a distributor portion (20), which is situated centrally relative to the flow control valve (13) and from which the curved suction arms (21, 22) emanate;
    the distributor portion (20) and the curved suction arms (21, 22) are disposed in such a way that the drive shaft (12) acts as a flow divider and
    the spray channel (25) of the flow control valve (13) opens centrally into the distributor portion (20).
  2. Vane pump according to claim 1, characterized in that a plain bearing bush (26) of the drive shaft (12) takes the form of a flow divider and the plain bearing bush (26) extends as far as into the vicinity of the inner control plate (7) (Fig. 3).
  3. Vane pump according to claim 1, characterized in that the bore (15) of the flow control valve (13), which bore contains a control plunger (17), emanates from a pressure chamber (1) and is inclined at an angle of around 15° towards the drive shaft (Fig. 5).
  4. Vane pump according to claim 1, characterized in that the leakage oil flows from the region of the rotor (5) through the suction arms (21, 22) directly to the suction zones (23, 24).
EP95936531A 1994-10-29 1995-10-21 Vane pump Expired - Lifetime EP0795086B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4438696A DE4438696A1 (en) 1994-10-29 1994-10-29 Vane pump
DE4438696 1994-10-29
PCT/EP1995/004129 WO1996013665A1 (en) 1994-10-29 1995-10-21 Vane pump

Publications (2)

Publication Number Publication Date
EP0795086A1 EP0795086A1 (en) 1997-09-17
EP0795086B1 true EP0795086B1 (en) 1998-05-27

Family

ID=6532010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936531A Expired - Lifetime EP0795086B1 (en) 1994-10-29 1995-10-21 Vane pump

Country Status (8)

Country Link
US (1) US5800135A (en)
EP (1) EP0795086B1 (en)
JP (1) JP3830514B2 (en)
KR (1) KR100380294B1 (en)
BR (1) BR9509452A (en)
DE (2) DE4438696A1 (en)
ES (1) ES2116778T3 (en)
WO (1) WO1996013665A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2332482B (en) * 1997-06-24 2001-10-03 Luk Fahrzeug Hydraulik Pump for conveying a medium
DE19927792A1 (en) * 1998-06-23 2000-03-16 Jidosha Kiki Co Oil pump for servo steering system on road vehicle incorporates rotor, cam ring, pump chamber and pressure plate arranged at least on one side of rotor and cam ring
DE10015020A1 (en) 2000-03-25 2001-09-27 Zf Lenksysteme Gmbh Positive displacement pump
WO2004007966A1 (en) * 2002-06-13 2004-01-22 Toyoda Koki Kabushiki Kaisha Oil pump
DE102015115587A1 (en) 2015-09-16 2017-03-16 Robert Bosch Automotive Steering Gmbh DISPLACEMENT PUMP, METHOD FOR OPERATING A DISPLACEMENT PUMP, STEERING SYSTEM AND TRANSMISSION

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981067A (en) * 1959-07-06 1961-04-25 Thompson Ramo Wooldridge Inc Flow regulator
JP2840087B2 (en) * 1989-08-29 1998-12-24 株式会社ユニシアジェックス Liquid pump
JPH0350587U (en) * 1989-09-26 1991-05-16
JP2895169B2 (en) * 1990-06-11 1999-05-24 株式会社ユニシアジェックス Vane pump

Also Published As

Publication number Publication date
EP0795086A1 (en) 1997-09-17
WO1996013665A1 (en) 1996-05-09
JP3830514B2 (en) 2006-10-04
KR970707389A (en) 1997-12-01
BR9509452A (en) 1998-01-06
ES2116778T3 (en) 1998-07-16
US5800135A (en) 1998-09-01
KR100380294B1 (en) 2003-07-18
JPH10508355A (en) 1998-08-18
DE59502366D1 (en) 1998-07-02
DE4438696A1 (en) 1996-05-02

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