EP0180746A1 - Constant flow-rate pump - Google Patents

Constant flow-rate pump Download PDF

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Publication number
EP0180746A1
EP0180746A1 EP85111894A EP85111894A EP0180746A1 EP 0180746 A1 EP0180746 A1 EP 0180746A1 EP 85111894 A EP85111894 A EP 85111894A EP 85111894 A EP85111894 A EP 85111894A EP 0180746 A1 EP0180746 A1 EP 0180746A1
Authority
EP
European Patent Office
Prior art keywords
throttle
pump
adjustable
pressure
line
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.)
Withdrawn
Application number
EP85111894A
Other languages
German (de)
French (fr)
Inventor
Siegfried Mayer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0180746A1 publication Critical patent/EP0180746A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening

Definitions

  • the invention relates to a pump according to the preamble of the main claim.
  • two adjustable throttles are arranged in the suction line, which can be set arbitrarily using the actuating lever.
  • the purpose is to provide the vehicle with a certain driving behavior in the case of a hydrostatic transmission for a vehicle drive supplied by the pump. It is therefore necessary to temporarily operate the vehicle with two accelerators, which is relatively complicated. The effort for this facility is also relatively large.
  • the pump according to the invention with the characterizing features of the main claim has the advantage that a speed-dependent suction throttling is created that is inexpensive and easy to use.
  • a pump 10 sucks pressure medium from a container 12 via a suction line 11 and displaces it into a delivery line 13.
  • an orifice 14 non-variable flow cross-section
  • an adjustable throttle 15 are arranged between the container and the pump.
  • the actuator 16 of the throttle 15 can be adjusted with the aid of a hydraulically actuated actuating cylinder 17, on which liquid pressure acts on the one hand via a line 18, against which a regulator spring 19.
  • the line 18 leads to a 3/2-way valve 21, of which a line 22 leads to a line 23 connected to the delivery line 13.
  • a branch line 24 leads from the line 23 to one end of the directional control valve 21, on the opposite end of which an adjustable regulator spring 25 acts.
  • a line 26 leads from the directional control valve 21 to the container 12.
  • the pump 10 is driven by any drive machine 27.
  • the pump 10 can be any hydrostatic pump that can be operated by suction throttling.
  • the orifice 14 acts as a suction throttle when the throttle 15 is fully open and limits the delivery flow of the pump 10 to a constant value regardless of the pump speed.
  • the delivery pressure propagates from the delivery line 13 into the line 23 and acts via the line 24 on one end of the directional control valve 21.
  • the operating pressure in the delivery line J3 reaches that reached by the spring 25 set on the directional control valve 21, it is shifted from its switching position II into the switching position I, so that pressure medium can reach the actuating cylinder 17 via the lines 22 and 18.
  • the cross section of the throttle 15 is reduced so far against the force of the spring 19 until the flow rate reduced by the throttling just maintains the set pressure.
  • the opening cross section of the throttle 15 is then less than the flow cross section of the orifice 14.
  • the directional control valve 21 can - as shown - be operated hydraulically or via a magnet switched by a pressure switch. Aperture 14 and throttle 15 can be combined in one component. In summary, it should be pointed out again that with this suction throttle control, the power consumption of a pump is reduced when the maximum operating pressure is exceeded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Transmission Device (AREA)

Abstract

Arranged in series in the intake line (11) of a fixed displacement pump (10) are an orifice (14) and an adjustable restrictor (15), the smallest cross-section of passage of which is smaller than that of the orifice (14). The restrictor (15) is adjusted by the pressure in the delivery line (13) with the aid of an actuating cylinder (17) which is subjected to pressure and is controlled via a directional control valve (21) which is likewise adjustable by the pressure in the delivery line counter to the force of a governor spring (25). The solution according to the invention ensures that the power input of a pump is reduced when the maximum pressure is exceeded. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Pumpe nach der Gattung des Hauptanspruches. Hier sind in der Saugleitung zwei verstellbare Drosseln angeordnet, die willkürlich über Betätigungshebel einstellbar sind. Der Zweck besteht darin, bei einem von der Pumpe versorgten hydrostatischen Getriebes für einen Fahrzeugantrieb, dem Fahrzeug ein bestimmtes Fahrverhalten vorzugeben. Es ist also notwendig, den Fahrbetrieb zeitweise mit zwei Fahrpedalen zu betätigen, was verhältnismäßig kompliziert ist. Auch ist der Aufwand für diese Einrichtung relativ groß.The invention relates to a pump according to the preamble of the main claim. Here two adjustable throttles are arranged in the suction line, which can be set arbitrarily using the actuating lever. The purpose is to provide the vehicle with a certain driving behavior in the case of a hydrostatic transmission for a vehicle drive supplied by the pump. It is therefore necessary to temporarily operate the vehicle with two accelerators, which is relatively complicated. The effort for this facility is also relatively large.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Pumpe mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß eine drehzahlabhängige Saugdrosselung geschaffen ist, die wenig aufwendig und einfach zu bedienen ist.The pump according to the invention with the characterizing features of the main claim has the advantage that a speed-dependent suction throttling is created that is inexpensive and easy to use.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind Weiterbildungen der im Hauptanspruch angegebenen Merkmale möglich.The measures listed in the subclaims allow further developments of the features specified in the main claim.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung und in der nachfolgenden Beschreibung näher erläutert. Diese zeigt und beschreibt eine Pumpe mit Saugdrosseln in schematischer Darstellung.An embodiment of the invention is explained in more detail in the drawing and in the description below. This shows and describes a pump with suction throttles in a schematic representation.

Beschreibung des ErfindungsbeispielsDescription of the invention example

Eine Pumpe 10 saugt über eine Saugleitung 11 Druckmittel aus einem Behälter 12 an und verdrängt dieses in eine Förderleitung 13. In der Saugleitung ist nahe dem Behälter eine Blende 14 (nicht veränderbarer Durchflußquerschnitt) und zwischen dieser und der Pumpe eine verstellbare Drossel 15 angeordnet. Das Stellglied 16 der Drossel 15 ist mit Hilfe eines hydraulisch beaufschlagten Stellzylinders 17 einstellbar, auf den einerseits über eine Leitung 18 Flüssigkeitsdruck einwirkt, diesem entgegen eine Reglerfeder 19. Die Leitung 18 führt zu einem 3/2-Wegeventil 21, von dem eine Leitung 22 zu einer an die Förderleitung 13 angeschlossenen Leitung 23 führt. Von der Leitung 23 führt eine Zweigleitung 24 an die eine Stirnseite des Wegeventils 21, auf dessen entgegengesetzte Stirnseite eine verstellbare Reglerfeder 25 einwirkt. Vom Wegeventil 21 führt eine Leitung 26 zum Behälter 12. Die Pumpe 10 ist von einer beliebigen Antriebsmaschine 27 angetrieben, Bei der Pumpe 10 kann es sich um eine beliebige hydrostatische Pumpe handeln, die durch Saugdrosselung betrieben werden kann.A pump 10 sucks pressure medium from a container 12 via a suction line 11 and displaces it into a delivery line 13. In the suction line, an orifice 14 (non-variable flow cross-section) and an adjustable throttle 15 are arranged between the container and the pump. The actuator 16 of the throttle 15 can be adjusted with the aid of a hydraulically actuated actuating cylinder 17, on which liquid pressure acts on the one hand via a line 18, against which a regulator spring 19. The line 18 leads to a 3/2-way valve 21, of which a line 22 leads to a line 23 connected to the delivery line 13. A branch line 24 leads from the line 23 to one end of the directional control valve 21, on the opposite end of which an adjustable regulator spring 25 acts. A line 26 leads from the directional control valve 21 to the container 12. The pump 10 is driven by any drive machine 27. The pump 10 can be any hydrostatic pump that can be operated by suction throttling.

Saugt die Pumpe 10 Druckmittel aus dem Behälter 12 an, so wirkt bei voll geöffneter Drossel 15 die Blende 14 als Saugdrossel und begrenzt unabhängig von der Pumpendrehzahl den Förderstrom der Pumpe 10 auf einen konstanten Wert. Der Förderdruck pflanzt sich aus der Förderleitung 13 in die Leitung 23 fort und wirkt über die Leitung 24 auf die eine Stirnseite des Wegeventils 21. Erreicht der Betriebsdruck in der Förderleitung J3 den durch die Feder 25 am Wegeventil 21 eingestellten Wert, so wird dieses von seiner Schaltstellung II in die Schaltstellung I verschoben, so daß Druckmittel über die Leitungen 22 und 18 zum Stellzylinder 17 gelangen kann. Nun wird der Querschnitt der Drossel 15 entgegen der Kraft der Feder 19 so weit verringert, bis der durch die Drosselung reduzierte Förderstrom gerade noch den eingestellten Druck aufrecht erhält. Der Öffnungsquerschnitt der Drossel 15 ist dann geringer als der Durchflußquerschnitt der Blende 14.If the pump 10 sucks pressure medium from the container 12, the orifice 14 acts as a suction throttle when the throttle 15 is fully open and limits the delivery flow of the pump 10 to a constant value regardless of the pump speed. The delivery pressure propagates from the delivery line 13 into the line 23 and acts via the line 24 on one end of the directional control valve 21. When the operating pressure in the delivery line J3 reaches that reached by the spring 25 set on the directional control valve 21, it is shifted from its switching position II into the switching position I, so that pressure medium can reach the actuating cylinder 17 via the lines 22 and 18. Now the cross section of the throttle 15 is reduced so far against the force of the spring 19 until the flow rate reduced by the throttling just maintains the set pressure. The opening cross section of the throttle 15 is then less than the flow cross section of the orifice 14.

Das Wegeventil 21 kann - wie dargestellt - hydraulisch betätigt werden oder über einen durch einen Druckschalter geschalteten Magnet. Blende 14 und Drossel 15 können in einem Bauteil zusammengefaßt sein. Zusammengefaßt sei nochmals ausgeführt, daß mit dieser Saugdrosselregelung die Leistungsaufnahme einer Pumpe bei Überschreiten des maximalen Betriebsdruckes abgesenkt wird.The directional control valve 21 can - as shown - be operated hydraulically or via a magnet switched by a pressure switch. Aperture 14 and throttle 15 can be combined in one component. In summary, it should be pointed out again that with this suction throttle control, the power consumption of a pump is reduced when the maximum operating pressure is exceeded.

Claims (4)

1. Pumpe mit konstantem Fördervolumen, die Druckmittel aus einem Behälter über eine Saugleitung (11) ansaugt, in der zwei Drosseln (14, 15) hintereinander angeordnet sind, dadurch gekennzeichnet, daß die eine Drossel (14) konstanten Durchflußquerschnitt hat, die zweite Drossel (15) verstellbar ausgebildet ist und deren kleinster Durchflußquerschnitt kleiner ist als derjenige der ersten Drossel, und daß die verstellbare Drossel (15) vom Druck in der Förderleitung (13) der Pumpe (10) einstellbar ist.1. Pump with constant delivery volume, the pressure medium sucks from a container via a suction line (11) in which two throttles (14, 15) are arranged one behind the other, characterized in that the one throttle (14) has a constant flow cross-section, the second throttle (15) is adjustable and the smallest flow cross-section is smaller than that of the first throttle, and that the adjustable throttle (15) is adjustable by the pressure in the delivery line (13) of the pump (10). 2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, daß die verstellbare Drossel (15) über ein Steuerventil (21) einstellbar ist, das einerseits vom Druck in der Förderleitung beaufschlagt ist und auf das andererseits eine Reglerfeder (25) einwirkt.2. Pump according to claim 1, characterized in that the adjustable throttle (15) via a control valve (21) is adjustable, which is acted on the one hand by the pressure in the delivery line and on the other hand, a regulator spring (25) acts. 3. Pumpe nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß dem Stellglied (16) der verstellbaren Drossel (15) ein druckbeaufschlagter Stellzylinder (17) zugeordnet ist, der vom Steuerventil (21) angesteuert ist und auf den entgegen dem Flüssigkeitsdruck eine Reglerfeder (19) einwirkt,3. Pump according to claim 1 and / or 2, characterized in that the actuator (16) of the adjustable throttle (15) is assigned a pressurized actuating cylinder (17) which is controlled by the control valve (21) and on the one against the liquid pressure Acts on the control spring (19), 4. Pumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, da die verstellbare Drossel (15) näher zur Pumpe liegt als die zweckmäßigerweise als Blende ausgebildete Drossel (14).4. Pump according to one of claims 1 to 3, characterized in that the adjustable throttle (15) is closer to the pump than the throttle (14) which is expediently designed as a diaphragm.
EP85111894A 1984-10-17 1985-09-20 Constant flow-rate pump Withdrawn EP0180746A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843438015 DE3438015A1 (en) 1984-10-17 1984-10-17 PUMP WITH CONSTANT FLOW RATE
DE3438015 1984-10-17

Publications (1)

Publication Number Publication Date
EP0180746A1 true EP0180746A1 (en) 1986-05-14

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ID=6248095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111894A Withdrawn EP0180746A1 (en) 1984-10-17 1985-09-20 Constant flow-rate pump

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EP (1) EP0180746A1 (en)
DE (1) DE3438015A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2625560B2 (en) * 1988-09-15 1997-07-02 ツァーンラートファブリーク、フリードリッヒスハーフェン、アクチエンゲゼルシャフト Radial piston pump
DE4320541A1 (en) * 1993-06-21 1994-12-22 Wagner Gmbh J Device for spraying spray material under high pressure
DE4409359A1 (en) * 1994-03-18 1995-09-21 Teves Gmbh Alfred Hydraulic pump driven system for vehicle
DE19612413B4 (en) * 1996-03-28 2006-06-29 Siemens Ag Pressure fluid supply system, in particular for a fuel injection system
DE19612412B4 (en) 1996-03-28 2006-07-06 Siemens Ag Control for a pressurized fluid supply system, in particular for the high pressure in a fuel injection system
DE19900562C2 (en) * 1999-01-09 2000-11-16 Bosch Gmbh Robert Common rail system
US6647965B1 (en) 2003-01-08 2003-11-18 Robert H. Breeden Pump assembly and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR816198A (en) * 1936-02-18 1937-08-02 Teves Kg Alfred Oil pump
GB2049823A (en) * 1979-05-22 1980-12-31 Bosch Gmbh Robert Improvements in or Relating to Systems for Producing Compressed Air
FR2539462A1 (en) * 1983-01-13 1984-07-20 Renault Automatic control pressure generator with flow rate monitoring

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR816198A (en) * 1936-02-18 1937-08-02 Teves Kg Alfred Oil pump
GB2049823A (en) * 1979-05-22 1980-12-31 Bosch Gmbh Robert Improvements in or Relating to Systems for Producing Compressed Air
FR2539462A1 (en) * 1983-01-13 1984-07-20 Renault Automatic control pressure generator with flow rate monitoring

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Publication number Publication date
DE3438015A1 (en) 1986-04-17

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Inventor name: MAYER, SIEGFRIED