EP0822334B1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
EP0822334B1
EP0822334B1 EP97112978A EP97112978A EP0822334B1 EP 0822334 B1 EP0822334 B1 EP 0822334B1 EP 97112978 A EP97112978 A EP 97112978A EP 97112978 A EP97112978 A EP 97112978A EP 0822334 B1 EP0822334 B1 EP 0822334B1
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EP
European Patent Office
Prior art keywords
gear pump
pressure
pump
relief valve
pressure relief
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP97112978A
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German (de)
French (fr)
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EP0822334A2 (en
EP0822334A3 (en
Inventor
Paul Lütkenhaus
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Neudecker & Jolitz & Co GmbH
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Neudecker & Jolitz & Co GmbH
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Publication of EP0822334A3 publication Critical patent/EP0822334A3/en
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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
    • 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
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00Power-operated mechanisms for wings
    • E05F15/50Power-operated mechanisms for wings using fluid-pressure actuators

Definitions

  • the invention relates to a hydraulic gear pump, in particular for door operating devices according to the preamble of the main claim.
  • Hydraulic gear pumps are used in door actuators successfully used for a long time.
  • This hydraulic Gear pumps are powered by a drive, for example an electric motor, driven and pumping under pressure hydraulic fluid towards a pistoned one Cylinder, which in turn with further connection elements, such as a toggle lever, with the one to be operated Door is connected.
  • a drive for example an electric motor
  • the hydraulic fluid is supplied, this caused an opening the door to be operated, the hydraulic fluid z. B. is promoted with a pressure of 35 bar.
  • the hydraulic Liquid is pumped in a cycle, i.e. H. the hydraulic fluid is then fed through a suction line fed back to the hydraulic gear pump.
  • the door drives are aligned that a swinging door is not the same until the very end Opening speed as in their middle range of motion has, but the door is about to be reached their maximum opening position with reduced speed moved to an abrupt hard braking of the Avoid the door when it reaches its maximum opening position. This also applies when a door is closed to to avoid loud and material slamming the door. During these phases the door will not move demands the full pump output of the hydraulic gear pump. A reduction in pump performance via a corresponding one Adjustment of the pump drive, e.g. B. one Electric motor, would be due to the required control devices costly and therefore disadvantageous.
  • the known door actuators a pressure relief valve on the gear pumps is connected to a harmful increase in the Avoid hydraulic fluid pressure if not the full pump power is required. In doing so, they effect Pressure relief valves that with an increase in the Gear pump pumped hydraulic fluid pressure a pressure relief valve opens and in the sense of a Bypass hydraulic fluid from the pressure line to the Suction line redirects to cause, on the one hand, the pressure the hydraulic fluid is reduced and also due to the return of the hydraulic fluid a continuous Run of the gear pump can take place.
  • GB 2 295 422 describes a fuel pump for fuel injection an internal combustion engine in which a pressure relief valve is integrated, however this is Pressure relief valve in a fixed part of the pump built-in, d. H. the pump housing is strongly on adapted to the installation of the valve. This is disadvantageous if Pumps can be built with or without a valve, because designed two completely different pump housings and have to be manufactured.
  • a hydraulic pump is known from US Pat. No. 4,828,462, which also has a pressure relief valve, but that not located in the immediate vicinity of the drive gears is, so that the space required for this is high.
  • a gear pump with included Relief valve known, with a bypass channel between the Pressure space and the suction space is created that a bearing body for the pinion shafts axially movable in pump housing is arranged and opposite the end wall of the Gear pump is loaded by an adjustable spring.
  • this is only with a relatively high level of design effort and a special adaptation of the pump housing to enable this purpose. Therefore, it is necessary to create a special housing for this, and if above Pump units are also manufactured without a pressure relief valve should be, especially for applications in which a Pressure relief valve is not necessary and a special one inexpensive technical solution is required, it is necessary two or more different housings for each Design and provide use cases. This is in Considerable in terms of manufacturing and storage costs and therefore unfavorable.
  • the pressure relief valve works in axial direction of the shafts of the gear wheels.
  • FR-A-2 393 956 is a hydraulic gear pump known that u. a. a pressure relief valve in a bearing body the gears describes the one depending on the condition Bypass channel between the pressure and suction area of the Gear pump enables or blocks.
  • This hydraulic Gear pump acts on the pressure relief valve
  • Bearing bodies of the gears are not directly used as sealing elements for the hydraulic fluid and therefore are additional sealing devices necessary, reducing the manufacturing costs a corresponding pump.
  • the direction of movement of the sealing body of the pressure relief valve axially formed to the gear axis and thereby the bearing body becomes very wide, so that this solution is due their size is disadvantageous wherever there is one in a confined space hydraulic gear pump is to be installed, e.g. B. in door actuators.
  • the invention has for its object a pump device to create especially for door operating devices, which have a pressure relief valve and which regarding of the pump devices that do not have a pressure relief valve exhibit minimal design changes.
  • a door operating device 1 is a detail of a door operating device 1, which essentially consists of a Electric motor 2 and an associated hydraulic Gear pump 3 exists. Connect to gear pump 3 other devices for door operation, such as a cylinder provided with a piston and a of which operated door toggle lever, which in turn with the one to be operated Door is connected, these latter facilities however, not shown for reasons of clarity are.
  • the electric motor 2 receives its electrical via a cable 4 Tension; via a motor shaft 5 and a coupling piece 6 the motor 2 connected to the gear pump 3, the Coupling 6 engages in a pump shaft 7.
  • the gear pump 3 consists essentially of a housing 8, in which two intermeshing gears are arranged are, only one gear 9 can be seen in FIG. 1.
  • On the sides of the gears 9 are delimited by bearing bodies 10 and 11, which receive the shafts 12 and 14 of the gear wheels 9.
  • These bearing bodies 10, 11 are essentially eight-shaped or glasses-like shape, as can be seen from FIGS. 2 and 3 is and have a sealing and storage function.
  • the gear pump 3 has a suction channel 15 for the hydraulic fluid on the gear pump 3 again flows in and a pressure line 16, in which the under pressure conveyed liquid medium is removed.
  • the flow direction of the hydraulic medium is illustrated by arrows in Fig. 1.
  • the electric motor 2 runs when the door operating device is in operation 1 always with the same power and moves over the motor shaft 5, the clutch 6 and the pump shaft 7, the gears 9, so that the hydraulic fluid through the pressure line 16th convey out of the pump area. If need hydraulic fluid is not high, for example if the Door is almost completely open and is switched so that it turns only moving slowly, becomes more hydraulic fluid promoted as the door operating device 1 needed and the Liquid pressure rises.
  • a pressure relief valve is used 17 proposed that in this embodiment in a bearing body 11 is provided.
  • the pressure relief valve consists essentially of a ball 18, which has a Spring 19 is loaded.
  • a ball 18 can also other sealing element can be used, e.g. B. a cone or the like.
  • the valve 17 is between the pressure side and the suction side the gear pump 3 arranged and connects them Pumps when needed.
  • the setting of the pressure relief valve 17 is in this Embodiment possible and takes place via a screw 21, which is provided on its outside with a thread 22, the combs with a thread of the screw seat 23.
  • the Screw 21 presses the spring 19, and another Screwing in the screw 21 places a greater load on the ball 18, so that the pressure relief valve 17 only at one opens higher pressure; of course, in reverse
  • the pressure relief valve 17 is also set in this way be that there is already a lower pressure in the Pressure line 16 opens.
  • the pressure relief valve 17 proposed here can also be trained in a different way, such. B. can instead another chosen ball / spring connection Device be present, which is elastic and if the pressure in the pressure channel 16 is too high, the bypass channel 20 releases.
  • the setting of the valve can also be set to other way.
  • Pressure relief valve 17 is only preset in the gear pump 3 to integrate, as can be seen from Fig. 3.
  • the pressure relief valve 17 can not have a Screw are regulated, but the setting of the Pressure relief valve 17 is preset at the factory, to save costs.
  • the ball 18 and the spring 19 were only used in the gear pump 3. By means of a mother 14, the pressure relief valve 17 is fixed.
  • pressure relief valve 17 it is also possible to separate the pressure relief valve 17 to control, e.g. B. over compressed air, or an externally controlled Use solenoid valve. This is beneficial to z. B. to open the valve when starting the pump to by Lowering the fluid pressure a lighter Allow the pump to start.
  • the bearing body 10 or 11 with an integrated pressure relief valve equip, d. H. as a fully integrated Unit so that the pump housing does not change at all must now if a gear pump 3 with a pressure relief valve should be equipped, because with this Embodiment on a bore of the pump housing for a spring 19 according to FIGS. 1 to 3 can be dispensed with.
  • the integration of the pressure relief valve 17 in the bearing body or "glasses" also has the advantage that when opening of the bypass channel created by the valve is extremely short. This is advantageous because when opening the valve a particularly quick Pressure equalization is brought about, so that, for. B. damage is avoided as quickly as possible due to overpressure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Description

Die Erfindung betrifft eine hydraulische Zahnradpumpe, insbesondere für Türbetätigungsvorrichtungen gemäß dem Oberbegriff des Hauptanspruches.The invention relates to a hydraulic gear pump, in particular for door operating devices according to the preamble of the main claim.

Hydraulische Zahnradpumpen sind bei Türbetätigungsvorrichtungen bereits seit langem erfolgreich im Einsatz. Diese hydraulischen Zahnradpumpen werden über einen Antrieb, beispielsweise einen Elektromotor, angetrieben und fördern unter Druck hydraulische Flüssigkeit in Richtung eines mit einem Kolben versehenen Zylinders, der wiederum mit weiteren Verbindungs elementen, beispielsweise einem Kniehebel, mit der zu betätigenden Tür verbunden ist. Wenn unter Druck dem Zylinder hydraulische Flüssigkeit zugeführt wird, bewirkte dies ein Öffnen der zu betätigenden Tür, wobei die hydraulische Flüssigkeit z. B. mit einem Druck von 35 bar gefördert wird. Die hydraulische Flüssigkeit wird in einem Kreislauf gefördert, d. h. die hydraulische Flüssigkeit wird anschließend über eine Saugleitung der hydraulischen Zahnradpumpe wieder zugeführt.Hydraulic gear pumps are used in door actuators successfully used for a long time. This hydraulic Gear pumps are powered by a drive, for example an electric motor, driven and pumping under pressure hydraulic fluid towards a pistoned one Cylinder, which in turn with further connection elements, such as a toggle lever, with the one to be operated Door is connected. When under pressure the cylinder hydraulic fluid is supplied, this caused an opening the door to be operated, the hydraulic fluid z. B. is promoted with a pressure of 35 bar. The hydraulic Liquid is pumped in a cycle, i.e. H. the hydraulic fluid is then fed through a suction line fed back to the hydraulic gear pump.

Bei diesen aus der Praxis bekannten hydraulischen Zahnradpumpen sind die Zahnräder mittels Lagerkörper, sog. "Brillen" gelagert, die in das Gehäuse einsetzbar sind. In these hydraulic gear pumps known from practice are the gears by means of bearing bodies, so-called "glasses" stored, which can be inserted into the housing.

Bei Türbetätigungsvorrichtungen sind die Türantriebe so ausgerichtet, daß eine aufschwingende Tür nicht bis zuletzt die gleiche Öffnungsgeschwindigkeit wie in ihrem mitleren Bewegungsbereich aufweist, sondern die Tür wird kurz vor dem Erreichen ihrer maximalen Öffnungsposition mit verringerter Geschwindigkeit bewegt, um ein abruptes hartes Abbremsen der Tür bei Erreichen ihrer maximalen Öffnungsposition zu vermeiden. Dies trifft ebenfalls bei dem Schließen einer Tür zu, um ein lautes und materialbelastendes Zuschlagen der Tür zu vermeiden. In diesen Phasen verringerter Bewegung der Tür wird nicht die volle Pumpenleistung der hydraulischen Zahnradpumpe abverlangt. Eine Reduzierung der Pumpenleistung über eine entsprechende Anpassung des Pumpenantriebes, z. B. also eines Elektromotors, wäre aufgrund der benötigten Regeleinrichtungen kostenintensiv und daher nachteilhaft.For door actuators, the door drives are aligned that a swinging door is not the same until the very end Opening speed as in their middle range of motion has, but the door is about to be reached their maximum opening position with reduced speed moved to an abrupt hard braking of the Avoid the door when it reaches its maximum opening position. This also applies when a door is closed to to avoid loud and material slamming the door. During these phases the door will not move demands the full pump output of the hydraulic gear pump. A reduction in pump performance via a corresponding one Adjustment of the pump drive, e.g. B. one Electric motor, would be due to the required control devices costly and therefore disadvantageous.

Aus diesem Grunde weisen die bekannten Türbetätigungsvorrichtungen ein Druckentlastungsventil auf, das den Zahnradpumpen nachgeschaltet ist, um eine schädliche Erhöhung des Druckes der hydraulischen Flüssigkeit zu vermeiden, wenn nicht die volle Pumpenleistung benötigt wird. Dabei bewirken diese Druckentlastungsventile, daß bei einem Anstieg des von der Zahnradpumpe geförderten Druckes der hydraulischen Flüssigkeit sich ein Druckentlastungsventil öffnet und im Sinne eines Bypass hydraulische Flüssigkeit von der Druckleitung zur Saugleitung umleitet, um zu bewirken, daß zum einen der Druck der hydraulischen Flüssigkeit vermindert wird und zudem aufgrund der Rückleitung der hydraulischen Flüssigkeit ein kontinuierlicher Lauf der Zahnradpumpe stattfinden kann.For this reason, the known door actuators a pressure relief valve on the gear pumps is connected to a harmful increase in the Avoid hydraulic fluid pressure if not the full pump power is required. In doing so, they effect Pressure relief valves that with an increase in the Gear pump pumped hydraulic fluid pressure a pressure relief valve opens and in the sense of a Bypass hydraulic fluid from the pressure line to the Suction line redirects to cause, on the one hand, the pressure the hydraulic fluid is reduced and also due to the return of the hydraulic fluid a continuous Run of the gear pump can take place.

Diese bekannten Druckentlastungsventile werden bei Türbetätigungsvorrichtungen in einer aufwendig aufgebauten Platte angeordnet, die der Zahnradpumpe nachgeschaltet ist. Diese nachgeschaltete Platte ist zum einen kostenaufwendig in der Herstellung und zudem ist der Platzbedarf dieser Platte recht hoch, so daß sich dadurch der Platzbedarf der gesamten Türbetätigungsvorrichtung erhöht.These known pressure relief valves are used in door actuators arranged in a complex plate, which is downstream of the gear pump. This downstream plate is costly in the one Manufacture and also the space requirement of this plate is right high, so that the space requirement of the entire door operating device elevated.

Aus der GB 2 295 422 ist eine Kraftstoffpumpe für die Kraftstoffeinspritzung einer Verbrennungsmaschine bekannt, in der ein Druckbegrenzungsventil integriert ist, jedoch ist dieses Druckbegrenzungsventil in einem feststehenden Teil der Pumpe eingebaut, d. h. das Pumpengehäuse ist in starkem Maße an dem Einbau des Ventils angepaßt. Dies ist nachteilhaft, wenn Pumpen sowohl mit als auch ohne Ventil gebaut werden, da hierfür zwei komplett unterschiedliche Pumpengehäuse konstruiert und gefertigt werden müssen.GB 2 295 422 describes a fuel pump for fuel injection an internal combustion engine in which a pressure relief valve is integrated, however this is Pressure relief valve in a fixed part of the pump built-in, d. H. the pump housing is strongly on adapted to the installation of the valve. This is disadvantageous if Pumps can be built with or without a valve, because designed two completely different pump housings and have to be manufactured.

Aus der US-PS 48 28 462 ist eine hydraulische Pumpe bekannt, die ebenfalls über ein Druckbegrenzungsventil verfügt, das jedoch nicht in unmittelbarer Nähe der Antriebszahnräder angeordnet ist, so daß der Platzbedarf hierfür hoch ist.A hydraulic pump is known from US Pat. No. 4,828,462, which also has a pressure relief valve, but that not located in the immediate vicinity of the drive gears is, so that the space required for this is high.

Aus der DD 221 798 ist eine Zahnradpumpe mit einbezogenem Überdruckventil bekannt, wobei ein Bypasskanal zwischen dem Druckraum und dem Ansaugraum dadurch geschaffen wird, daß ein Lagerkörper für die Ritzelwellen axial beweglich im Pumpengehäuse angeordnet ist und gegenüber der Stimwandung der Zahnradpumpe mittels einer einstellbaren Feder belastet ist. Dies ist jedoch nur mit einem relativ hohen konstruktiven Aufwand und einer besonderen Adaptierung des Pumpengehäuses an diesen Einsatzzweck zu ermöglichen. Daher ist es notwendig, ein spezielles Gehäuse hierfür zu schaffen, und wenn darüber hinaus Pumpeneinheiten ohne Druckbegrenzungsventil gefertigt werden sollen, insbesondere für Anwendungen, in denen ein Druckbegrenzungsventil nicht notwendig ist und eine besonders kostengünstige technische Lösung gefordert wird, ist es notwendig, zwei oder mehr verschiedene Gehäuse für die jeweiligen Anwendungsfälle zu konstruieren und bereitzustellen. Dies ist im Hinblick auf die Herstellungs- und Lagerkosten aufwendig und daher ungünstig. Zudem arbeitet das Druckbegrenzungsventil in axialer Richtung der Wellen der Zahnräder.From DD 221 798 is a gear pump with included Relief valve known, with a bypass channel between the Pressure space and the suction space is created that a bearing body for the pinion shafts axially movable in pump housing is arranged and opposite the end wall of the Gear pump is loaded by an adjustable spring. However, this is only with a relatively high level of design effort and a special adaptation of the pump housing to enable this purpose. Therefore, it is necessary to create a special housing for this, and if above Pump units are also manufactured without a pressure relief valve should be, especially for applications in which a Pressure relief valve is not necessary and a special one inexpensive technical solution is required, it is necessary two or more different housings for each Design and provide use cases. This is in Considerable in terms of manufacturing and storage costs and therefore unfavorable. In addition, the pressure relief valve works in axial direction of the shafts of the gear wheels.

Aus der FR-A-2 393 956 ist eine hydraulische Zahnradpumpe bekannt, die u. a. ein Druckbegrenzungsventil in einem Lagerkörper der Zahnräder beschreibt, der je nach Zustand einen Bypasskänal zwischen dem Druck- und dem Saugbereich der Zahnradpumpe freigibt bzw. sperrt. Bei dieser hydraulischen Zahnradpumpe wirkt der das Druckbegrenzungsventil aufweisende Lagerkörper der Zahnräder nicht unmittelbar als Abdichtungselemente für die hydraulische Flüssigkeit und daher sind zusätzliche Abdichtvorrichtungen notwendig, wodurch die Herstellungskosten einer entsprechenden Pumpe steigen. Zudem ist die Bewegungsrichtung des Dichtkörpers des Druckbegrenzungsventiles axial zur Zahnradachse ausgebildet und hierdurch wird der Lagerkörper sehr breit, so daß diese Lösung aufgrund ihrer Größe nachteilig ist überall dort, wo auf engstem Raum eine hydraulische Zahnradpumpe zu installieren ist, z. B. in Türbetätigungsvprrichtungen. FR-A-2 393 956 is a hydraulic gear pump known that u. a. a pressure relief valve in a bearing body the gears describes the one depending on the condition Bypass channel between the pressure and suction area of the Gear pump enables or blocks. With this hydraulic Gear pump acts on the pressure relief valve Bearing bodies of the gears are not directly used as sealing elements for the hydraulic fluid and therefore are additional sealing devices necessary, reducing the manufacturing costs a corresponding pump. moreover is the direction of movement of the sealing body of the pressure relief valve axially formed to the gear axis and thereby the bearing body becomes very wide, so that this solution is due their size is disadvantageous wherever there is one in a confined space hydraulic gear pump is to be installed, e.g. B. in door actuators.

Der Erfindung liegt die Aufgabe zugrunde, eine Pumpenvorrichtung insbesondere für Türbetätigungsvorrichtungen zu schaffen, die ein Druckbegrenzungsventil aufweisen und die hinsichtlich der Pumpenvorrichtungen, die kein Druckbegrenzungsventil aufweisen, nur minimale konstruktive Änderungen erfordern.The invention has for its object a pump device to create especially for door operating devices, which have a pressure relief valve and which regarding of the pump devices that do not have a pressure relief valve exhibit minimal design changes.

Mit anderen Worten ausgedrückt wird vorgeschlagen, lediglich die Lagerkörper für die Zahnräder der hydraulischen Zahnradpumpe zu modifizieren, um ein Druckbegrenzungsventil zu erhalten, so daß es beispielsweise überhaupt nicht erforderlich sein muß, das Pumpengehäuse selbst zu modifizieren, sondern lediglich einen Lagerkörper für die Zahnräder entsprechend mit einem Druckbegrenzungsventil auszustatten.In other words, it is suggested only the bearing bodies for the gears of the hydraulic gear pump to modify to a pressure relief valve received so that, for example, it is not required at all must be to modify the pump housing itself, but only a bearing body for the gears accordingly to equip a pressure relief valve.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen erläutert.Advantageous embodiments of the invention are in the subclaims explained.

Ausführungsbeispiele der Erfindung werden nachfolgend in der Zeichnung dargestellt, wobei

Fig. 1
in einer Seitenansicht einen Elektromotor mit daran angeordneter hydraulischer Zahnradpumpe zeigt,
Fig. 2
zeigt einen Querschnitt durch die Zahnradpumpe und
Fig. 3
zeigt ein weiteres Ausführungsbeispiel einer hydraulischen Zahnradpumpe.
Embodiments of the invention are shown below in the drawing, wherein
Fig. 1
shows a side view of an electric motor with a hydraulic gear pump arranged thereon,
Fig. 2
shows a cross section through the gear pump and
Fig. 3
shows a further embodiment of a hydraulic gear pump.

Bezugnehmend auf Fig. 1 ist ein Ausschnitt einer Türbetätigungsvorrichtung 1 dargestellt, die im wesentlichen aus einem Elektromotor 2 und einer damit verbundenen hydraulischen Zahnradpumpe 3 besteht. An die Zahnradpumpe 3 schließen sich weitere Vorrichtungen für die Türbetätigung an, wie beispielsweise ein mit einem Kolben versehener Zylinder und ein davon betätigter Türkniehebel, der wiederum mit der zu betätigenden Tür verbunden ist, wobei diese zuletzt genannten Einrichtungen jedoch aus Übersichtlichkeitsgründen nicht dargestellt sind.1 is a detail of a door operating device 1, which essentially consists of a Electric motor 2 and an associated hydraulic Gear pump 3 exists. Connect to gear pump 3 other devices for door operation, such as a cylinder provided with a piston and a of which operated door toggle lever, which in turn with the one to be operated Door is connected, these latter facilities however, not shown for reasons of clarity are.

Der Elektromotor 2 erhält über ein Kabel 4 seine elektrische Spannung; über eine Motorwelle 5 und ein Kupplungsstück 6 ist der Motor 2 mit der Zahnradpumpe 3 verbunden, wobei die Kupplung 6 in eine Pumpenwelle 7 eingreift.The electric motor 2 receives its electrical via a cable 4 Tension; via a motor shaft 5 and a coupling piece 6 the motor 2 connected to the gear pump 3, the Coupling 6 engages in a pump shaft 7.

Die Zahnradpumpe 3 besteht im wesentlichen aus einem Gehäuse 8, in dem zwei ineinanderkämmende Zahnräder angeordnet sind, wobei in Fig. 1 lediglich ein Zahnrad 9 zu sehen ist. An den Seiten sind die Zahnräder 9 begrenzt durch Lagerkörper 10 und 11, die die Wellen 12 und 14 der Zahnräder 9 aufnehmen. Diese Lagerkörper 10, 11 haben im wesentlichen eine achtförmige bzw. brillenförmige Form, wie dies aus den Fig. 2 und 3 ersichtlich ist und haben eine Dichtungs- und Lagerungsfunktion.The gear pump 3 consists essentially of a housing 8, in which two intermeshing gears are arranged are, only one gear 9 can be seen in FIG. 1. On the sides of the gears 9 are delimited by bearing bodies 10 and 11, which receive the shafts 12 and 14 of the gear wheels 9. These bearing bodies 10, 11 are essentially eight-shaped or glasses-like shape, as can be seen from FIGS. 2 and 3 is and have a sealing and storage function.

Zudem weist die Zahnradpumpe 3 einen Saugkanal 15 für die hydraulische Flüssigkeit auf, die der Zahnradpumpe 3 wieder zuströmt und einer Druckleitung 16, in dem das unter Druck geförderte flüssige Medium abgefördert wird. Die Fließrichtung des hydraulischen Mediums wird durch Pfeile in Fig. 1 verdeutlicht.In addition, the gear pump 3 has a suction channel 15 for the hydraulic fluid on the gear pump 3 again flows in and a pressure line 16, in which the under pressure conveyed liquid medium is removed. The flow direction of the hydraulic medium is illustrated by arrows in Fig. 1.

Der Elektromotor 2 läuft bei Betrieb der Türbetätigungsvorrichtung 1 stets mit gleicher Leistung und bewegt über die Motorwelle 5, die Kupplung 6 und die Pumpenwelle 7 die Zahnräder 9, so daß sie die hydraulische Flüssigkeit über die Druckleitung 16 aus dem Pumpenbereich herausfördern. Wenn der Bedarf an hydraulischer Flüssigkeit nicht hoch ist, beispielsweise wenn die Tür beinahe ganz geöffnet ist und so geschaltet ist, daß sie sich nur noch langsam bewegt, wird mehr hydraulische Flüssigkeit gefördert als die Türbetätigungsvorrichtung 1 benötigt und der Druck der Flüssigkeit steigt an. Um ein zu starkes Ansteigen des Flüssigkeitsdruckes zu verhindern, wird ein Druckentlastungsventil 17 vorgeschlagen, das in diesem Ausführungsbeispiel in einer Lagerkörper 11 vorgesehen ist. Das Druckentlastungsventil besteht im wesentlichen aus einer Kugel 18, die über eine Feder 19 belastet wird. Anstatt einer Kugel 18 kann auch ein anderes Dichtungselement verwendet werden, z. B. ein Kegel od. dgl. Bei einem Ansteigen des Druckes in der Druckleitung 16 wird die Kugel 18 nach oben gedrückt und gibt einen Bypasskanal 20 frei, so daß die Flüssigkeit von der Druckleitung 16 in die Saugleitung 15 strömen kann, so daß eine Druckentlastung stattfindet. Das Ventil 17 ist zwischen Druckseite und Saugseite der Zahnradpumpe 3 angeordnet und verbindet diese Pumpen bei Bedarf.The electric motor 2 runs when the door operating device is in operation 1 always with the same power and moves over the motor shaft 5, the clutch 6 and the pump shaft 7, the gears 9, so that the hydraulic fluid through the pressure line 16th convey out of the pump area. If need hydraulic fluid is not high, for example if the Door is almost completely open and is switched so that it turns only moving slowly, becomes more hydraulic fluid promoted as the door operating device 1 needed and the Liquid pressure rises. To increase the To prevent fluid pressure, a pressure relief valve is used 17 proposed that in this embodiment in a bearing body 11 is provided. The pressure relief valve consists essentially of a ball 18, which has a Spring 19 is loaded. Instead of a ball 18 can also other sealing element can be used, e.g. B. a cone or the like. When the pressure in the pressure line 16 rises the ball 18 is pushed upwards and gives a bypass channel 20 free, so that the liquid from the pressure line 16 in the Suction line 15 can flow, so that pressure relief takes place. The valve 17 is between the pressure side and the suction side the gear pump 3 arranged and connects them Pumps when needed.

Die Einstellung des Druckentlastungsventiles 17 ist in diesem Ausführungsbeispiel möglich und erfolgt über eine Schraube 21, die an ihrer Außenseite mit einem Gewinde 22 versehen ist, das mit einem Gewinde des Schraubensitzes 23 kämmt. Die Schraube 21 drückt auf die Feder 19, und bei einem weiteren Hineindrehen der Schraube 21 wird die Kugel 18 stärker belastet, so daß sich das Druckentlastungsventil 17 erst bei einem höheren Druck öffnet; selbstverständlich kann in umgekehrter Weise auch das Druckentlastungsventil 17 derart eingestellt werden, daß es sich bereits bei einem geringeren Druck in der Druckleitung 16 öffnet.The setting of the pressure relief valve 17 is in this Embodiment possible and takes place via a screw 21, which is provided on its outside with a thread 22, the combs with a thread of the screw seat 23. The Screw 21 presses the spring 19, and another Screwing in the screw 21 places a greater load on the ball 18, so that the pressure relief valve 17 only at one opens higher pressure; of course, in reverse The pressure relief valve 17 is also set in this way be that there is already a lower pressure in the Pressure line 16 opens.

Das hier vorgeschlagene Druckentlastungsventil 17 kann auch auf andere Art und Weise ausgebildet sein, so z. B. kann anstelle der gewählten Verbindung Kugel/Feder auch eine andere Vorrichtung vorhanden sein, die elastisch ausgebildet ist und bei einem zu hohen Druck im Druckkanal 16 den Bypasskanal 20 freigibt. Ebenfalls kann die Einstellung des Ventils auch auf andere Art und Weise erfolgen.The pressure relief valve 17 proposed here can also be trained in a different way, such. B. can instead another chosen ball / spring connection Device be present, which is elastic and if the pressure in the pressure channel 16 is too high, the bypass channel 20 releases. The setting of the valve can also be set to other way.

In einer etwas einfacheren Ausführung ist es möglich, das Druckentlastungsventil 17 lediglich voreingestellt in die Zahnradpumpe 3 zu integrieren, wie dies aus Fig. 3 ersichtlich ist. Dabei kann das Druckentlastungsventil 17 nicht über eine Schraube reguliert werden, sondern die Einstellung des Druckentlastungsventiles 17 ist bereits ab Werk voreingestellt, um Kosten zu sparen. Die Kugel 18 und die Feder 19 wurden lediglich in die Zahnradpumpe 3 eingesetzt. Mittels einer Mutter 14 wird das Druckentlastungsventil 17 fixiert.In a somewhat simpler version, it is possible that Pressure relief valve 17 is only preset in the gear pump 3 to integrate, as can be seen from Fig. 3. The pressure relief valve 17 can not have a Screw are regulated, but the setting of the Pressure relief valve 17 is preset at the factory, to save costs. The ball 18 and the spring 19 were only used in the gear pump 3. By means of a mother 14, the pressure relief valve 17 is fixed.

Es ist auch möglich, das Druckentlastungsventil 17 gesondert anzusteuern, z. B. über Druckluft, oder aber ein fremdgesteuertes Magnetventil zu verwenden. Dies ist vorteilhaft, um z. B. das Ventil beim Starten der Pumpe zu öffnen, um durch die Herabsetzung des Förderflüssigkeits-Druckes ein leichteres Starten der Pumpe zu ermöglichen.It is also possible to separate the pressure relief valve 17 to control, e.g. B. over compressed air, or an externally controlled Use solenoid valve. This is beneficial to z. B. to open the valve when starting the pump to by Lowering the fluid pressure a lighter Allow the pump to start.

In einer besonders kostengünstigen Ausführungsart ist es möglich, den Lagerkörper 10 oder 11 mit einem integrierten Druckbegrenzungsventil auszustatten, d. h. als komplett integrierte Einheit, so daß das Pumpengehäuse überhaupt nicht verändert werden muß, wenn nun eine Zahnradpumpe 3 mit einem Druckbegrenzungsventil ausgestattet werden soll, da man bei dieser Ausführungsform auf eine Bohrung des Pumpengehäuses für eine Feder 19 entsprechend den Fig. 1 bis 3 verzichten kann. In einem derartigen Ausführungsbeispiel wäre ein das Druckbegrenzungsventil verschließendes Element innerhalb des Lagerkörpers 10, 11 integriert angeordnet.In a particularly inexpensive embodiment, it is possible the bearing body 10 or 11 with an integrated pressure relief valve equip, d. H. as a fully integrated Unit so that the pump housing does not change at all must now if a gear pump 3 with a pressure relief valve should be equipped, because with this Embodiment on a bore of the pump housing for a spring 19 according to FIGS. 1 to 3 can be dispensed with. In one such embodiment would be the pressure relief valve closing element within the bearing body 10, 11 arranged integrated.

Jedoch auch wenn die Ausführungsformen gemäß den Fig. 1 bis 3 verwendet werden, sind die erforderlichen Modifikationen an dem Pumpengehäuse 8 gering, die dazu notwendig ist, um dieses Gehäuse mit einem Druckbegrenzungsventil auszustatten.However, even if the embodiments according to FIG. 1 used until 3 are the required modifications on the pump housing 8 low, which is necessary to to equip this housing with a pressure relief valve.

Die Integration des Druckbegrenzungsventiles 17 in die Lagerkörper bzw. "Brille" hat zudem den Vorteil, daß der bei Öffnung des Ventils entstehende Bypass-Kanal extrem kurz ist. Dies ist vorteilhaft, da bei Öffnung des Ventils ein besonders schneller Druckausgleich herbeigeführt wird, so daß z. B. ein Schaden aufgrund Überdruck schnellstmöglich vermieden wird.The integration of the pressure relief valve 17 in the bearing body or "glasses" also has the advantage that when opening of the bypass channel created by the valve is extremely short. This is advantageous because when opening the valve a particularly quick Pressure equalization is brought about, so that, for. B. damage is avoided as quickly as possible due to overpressure.

Claims (5)

  1. Hydraulic gear pump, particularly for a door actuating device with a housing in which are arranged external meshed gearwheels, the gearwheels being supported by at least one bearing body which can be removed from the housing, where at least one gearwheel is provided with a drive, a pressure pipe for the hydraulic fluid to be conveyed and a suction pipe for the hydraulic fluid to be sucked in, a bypass duct being located between the pressure and suction pipe of the pump and opened by a pressure limiting valve (17) arranged in a bearing body (11) whose outer wall is arranged in the housing (8) so that it seals it, characterised in that the straight line of movement of the sealing element of the pressure limiting valve (17) is arranged at right angles to the axis of rotation of the gearwheels.
  2. Gear pump according to claim 1, characterised by a spring-loaded sealing element of'the pressure limiting valve (17), whose spring (19) is adjustable in terms of its tension.
  3. Gear pump according to one of the preceding claims, characterised by a pressure limiting valve (17) that can be remotely controlled.
  4. Gear pump according to one of the preceding claims, characterised by the bearing body (11) exhibiting the pressure limiting valve (17), which body is arranged with its outside in the housing (8), so that it seals it, except for recesses for the bypass duct (20), for the pressure pipe (16) and suction pipe (15).
  5. Gear pump according to one of the preceding claims, characterised by an octagonal design of the external bearing body (11).
EP97112978A 1996-08-02 1997-07-29 Gear pump Expired - Lifetime EP0822334B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19631202A DE19631202A1 (en) 1996-08-02 1996-08-02 Hydraulic gear pump, in particular for a door operating device
DE19631202 1996-08-02

Publications (3)

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EP0822334A2 EP0822334A2 (en) 1998-02-04
EP0822334A3 EP0822334A3 (en) 1998-11-25
EP0822334B1 true EP0822334B1 (en) 2003-09-17

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ID=7801575

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EP97112978A Expired - Lifetime EP0822334B1 (en) 1996-08-02 1997-07-29 Gear pump

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EP (1) EP0822334B1 (en)
DE (3) DE19631202A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933864C2 (en) * 1999-07-23 2003-05-28 Neudecker & Jolitz Gmbh & Co Door Opener
CN111119637A (en) * 2019-12-23 2020-05-08 北京电子工程总体研究所 Pneumatic cabin body door cover opening mechanism

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758548A (en) * 1950-08-24 1956-08-14 Edward A Rockwell Rotary fluid displacement device and mechanism therefor
US3671143A (en) * 1970-11-05 1972-06-20 Trw Inc Flat side valve for pressure balanced power steering pump with improved aspirator action
FR2393956A2 (en) * 1977-06-07 1979-01-05 Hydro Meca Gear pump for power assisted steering system - has delivery valve with sprung piston to control volume of oil flow
DE3225549A1 (en) * 1982-07-08 1984-01-12 Robert Bosch Gmbh, 7000 Stuttgart Pump, in particular for feeding fuel for internal combustion engines
DE3320596A1 (en) * 1983-06-08 1984-01-05 Neudecker & Jolitz GmbH & Co KG, 4423 Gescher Compact motor-pump unit comprising electric motor and externally toothed gear pump complete in one housing
DD221798A1 (en) * 1984-03-12 1985-05-02 Schwermasch Liebknecht Veb K GEAR PUMP WITH INTEGRATED OVERPRESSURE VALVE
US4902202A (en) * 1987-07-29 1990-02-20 Hydreco, Inc. Variable discharge gear pump with energy recovery
US4828462A (en) * 1987-12-10 1989-05-09 Dana Corporation Pressure detecting system for a hydraulic device
US5397219A (en) * 1993-06-21 1995-03-14 C. Cretors & Company Integral liquid pump and drainback valve
DE4441505A1 (en) * 1994-11-22 1996-05-23 Bosch Gmbh Robert Fuel feed pump for a fuel injection pump for internal combustion engines
DE4444819A1 (en) * 1994-12-15 1996-06-20 Bayerische Motoren Werke Ag Lubricating oil pump for IC engine

Also Published As

Publication number Publication date
DE19631202A1 (en) 1998-02-05
DE29713614U1 (en) 1997-10-30
DE59710749D1 (en) 2003-10-23
EP0822334A2 (en) 1998-02-04
EP0822334A3 (en) 1998-11-25

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