EP2216550A2 - Gear wheel pump with shaft seal - Google Patents

Gear wheel pump with shaft seal Download PDF

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Publication number
EP2216550A2
EP2216550A2 EP10001269A EP10001269A EP2216550A2 EP 2216550 A2 EP2216550 A2 EP 2216550A2 EP 10001269 A EP10001269 A EP 10001269A EP 10001269 A EP10001269 A EP 10001269A EP 2216550 A2 EP2216550 A2 EP 2216550A2
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EP
European Patent Office
Prior art keywords
pump
gear
housing cover
drive
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10001269A
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German (de)
French (fr)
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EP2216550A3 (en
EP2216550B1 (en
Inventor
Michael Rothen
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.)
Illinois Tool Works Inc
Original Assignee
Inatec GmbH
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Filing date
Publication date
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Priority to PL10001269T priority Critical patent/PL2216550T3/en
Publication of EP2216550A2 publication Critical patent/EP2216550A2/en
Publication of EP2216550A3 publication Critical patent/EP2216550A3/en
Application granted granted Critical
Publication of EP2216550B1 publication Critical patent/EP2216550B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates

Definitions

  • a gear pump with the features of the preamble of claim 1.
  • a gear pump is provided with at least two externally meshing gears, which bear with their flat sides directly or indirectly on housing covers of the gear pump.
  • At least one drive gear is provided with shaft journal and rotatably connected thereto, wherein the shaft journals are arranged on both sides of the at least one drive gear and rotatably mounted in the respective adjacent housing cover.
  • One of the shaft journals of the drive gear is extended and guided as a drive pivot through the adjacent housing cover to the outside.
  • a shaft seal is provided for the drive pivot. This acts sealingly between the drive pivot and the housing cover penetrated by it and is on the pump gear wheels facing the inside of the penetrated by the drive pivot pin first Housing cover arranged in a gear-side recess of the housing cover.
  • Gear pumps of the type described above are known in their basic principle for decades and are used, inter alia, for driving hydraulic systems in vehicle technology, where high efficiency with simple and cost-effective production and the generation of high pressures in the foreground.
  • the construction and the principle of operation of a gear pump is particularly clear in the DE 24 11 492 C2 described.
  • the pump is constructed of three plate-shaped housing parts, which is why such pumps are also referred to as "plate pumps". Of the sandwiched plates, the middle takes up the pump chamber with the two pump gears in this case (pump plate). On both sides of the pump plate are at her sealing housing cover, which close the pump chamber in the axial direction (first and second cover plate).
  • Such pumps can also be used for problematic pumping liquids, such as adhesives.
  • adhesives such as adhesives.
  • PUR adhesives reactive adhesives
  • a gear or plate pump is also used in the DE 81 01 898 U1 described.
  • the pressure effect can be taken from an acting in the axial direction Federkraftbeetzschung the piston or from the hydrostatic pressure of the fluid to be delivered.
  • To seal the high pressure side of the piston against the low pressure side sealing rings are provided, which are arranged in a pressure-loaded annular space.
  • a disadvantage of such an arrangement is in addition to a high cleaning effort that the front side of the promotional gears are exposed by the action of the pistons heavy wear.
  • a contrast easier to clean (metering) gear pump can the US Pat. No. 6,857,860 B1 be removed.
  • the seal of the delivery volume relative to the pump housing and with respect to the drive shaft is effected by a sealing ring arranged in a recess of a housing plate, which is pressed against the driving gear, which is non-rotatably connected to the shaft. The pressing is done by spring force.
  • the recess receiving the sealing ring is subjected to a pressurized sealing liquid.
  • the front side of the driving Gear exposed by the acted upon by mechanical or hydrostatic pressure sealing ring strong mechanical loads, which are a wear reduction of the pump, but in particular of the gear, detrimental.
  • a structurally complex gear pump with preferably three gears can the DE 69 24 726 U be removed.
  • the conveying gears are driven by a third gear, which is in engagement with the driving gear, wherein the drive takes place on the low pressure side of the delivery volume.
  • the arrangement of the drive shaft on the low pressure side of the pump leads to lower demands on the sealing effect of the seal.
  • a recess is provided, in which a plate can be used for fixing the gears.
  • a suitable for promoting not self-lubricating media gear pump can the DE 19 27 514 U1 be removed.
  • the gears do not touch within the pumped volume of the pump, therefore, the gears are driven individually and synchronously.
  • the synchronous drive is carried out in a the volume to be delivered upstream gear housing, which is closed to the oil volume to be delivered.
  • the seals are arranged so that they are accessible from the volume to be delivered.
  • the bearing of the drive shaft is effected by two ball bearings, which are arranged spaced apart in the axial direction in a housing chamber. The chamber is sealed from the volume to be delivered by a packing.
  • the invention is based on the problem in a generic pump to extend the life of the shaft seal for the drive pivot, so that a low maintenance is achieved even for problematic fluids to be pumped.
  • the recess is provided with an arranged on the side facing the pump chamber prechamber, wherein the prechamber supplies the shaft seal with constantly exchanging fluid to be pumped.
  • a further improvement, which also affects the durability of the shaft seal can be achieved by using a bearing bush instead of the fitting gap between the rotary drive pin and the housing cover in question , which absorbs the radial bearing forces and ensures good low-friction bearing and the inner shaft seal better protects against radial loads.
  • the bearing bush can be different means for pivot bearing, such as plain bearings or pivot bearings act.
  • gear pump is designed as a plate pump, in which both sides of a pump plate 12 first and second plate-shaped housing cover 14A, 14B are sealingly applied to the pump plate 12.
  • Two externally meshing pump gears 16A, 16B are arranged in known and intersecting cylindrical openings of the pump plate 12.
  • the drive-side pump gear 16 A is rotatably connected to a drive shaft 18. This has (in the drawing on the left) on the drive side a housing cover 14A outwardly projecting drive pivot pin 18A.
  • the drive shaft On the drive opposite side of the pump gear 16A, the drive shaft has a shaft journal 18B rotatably supported in a mating bore 32A of the second (rear) housing cover 14B with a small radial gap.
  • This bore can be designed as a blind bore or otherwise be sealed against the end face of the pump space.
  • the second pump gear 16B meshing with the first pump gear 16A may be radially and axially supported in any desired manner.
  • the entry of the pumping fluid takes place for example via a lateral inlet opening 20 of the pump plate 2 approximately in the contact region of the two pump gears.
  • the outlet opening is generally diametrically opposite to the inlet opening 20.
  • the drive-side rotary mounting of the drive shaft 18 takes place in the embodiment according to FIG. 1 via a bearing bush 22, which is recessed into the first (front) housing cover 14A on the side opposite the pump plate 12. in this connection it may, for example, be a self-lubricating plain bearing or a roller bearing.
  • a housing cover recess 24 in which a ring seal as a shaft seal 26 for radial sealing of the drive shaft 18 relative to the pump chamber and the first (front) housing cover 14A is used.
  • a towards the pump chamber towards, preferably conically, expanding antechamber 24A of the recess 24 provides the shaft seal 26 with constantly exchanging fluid to be pumped.
  • a radial fitting gap is provided between the drive shaft 18 and the first (front) housing cover 14A.
  • the drive pivot pin 18A is surrounded by a countershaft 28 with a chamber 28A which is open toward the drive pivot pin 18A and can be acted upon by lubricant via radial bores 28B, 28C.
  • a shaft seal 30 seals the chamber 28 A from the outer part of the drive shaft 18 fluidly.
  • the second housing cover 14B rests on its outside tightly against a pump plate, wherein the supply and the discharge for fluid to be pumped (not shown) through the second housing cover 14B through.
  • the second pump gear 16B is seated with the necessary radial play rotatably on a second shaft 19 which is mounted in the first housing cover 14A in a blind bore and rotatably seated in the second housing cover 14B.
  • the shaft journal 18B is rotatable with respect to the second housing cover 14B, wherein the pump chamber 21 located in the pump plate 12 may be sealed by a pump chamber seal 21A against the second housing cover 14B and the shaft journal 18B if necessary.
  • the gear wheel side arranged in the first housing cover 14A shaft seal 26 in axial Direction via a support ring 26A supported on the second housing cover 14B.
  • FIG. 1 The embodiment shown can be modified in a similar manner as the embodiment of the FIG. 2B in relation to those in FIG. 2A , wherein the bearing bush 22 may also be significantly larger in circumference than in FIG. 1 so that common needle roller bearings can be used as a bearing bushing 22, wherein a housing part receiving the needle roller bearing and the needle roller bearing may be partially extended within the first housing cover 14A and partly outside thereof.
  • Bearing bushes 22 used in accordance with the invention can, in particular in one embodiment, also be provided as pump bearings on the pump side or on both sides with additional shaft seals.
  • the possible outlines of a bearing bush 22 in the form of a encapsulated by a housing needle roller bearings are in FIG. 1 drawn in dashed form as an alternative.
  • the pump gears are arranged on a second shaft 19 and a third shaft 19 '.
  • the shafts 19, 19 ' are arranged in cylindrical openings of the pump plates 12 and 12'. Due to the multi-stage design, the delivery volume of the pump according to Fig. 3 relative to the volume of a pump according to the FIGS. 1 . 2A or 2 B be multiplied. For example, according to Fig. 3 about a fourfold or eightfold increase in the delivery volume possible.
  • a recess 24 is provided, in which a shaft seal 26 is arranged.
  • the recess 24 is provided with an on the pump chamber facing side arranged prechamber 24A.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The pump (10) has shaft journals (18B) rotatably connected with a drive gear (16A) and rotatably mounted in housing covers (14A, 14B) at both sides of the drive gear. A shaft seal (26) controls leakage of fluid to be pumped and seals an actuator pivot (18A) with respect to one of the housing covers penetrated by the actuator pivot. The shaft seal is arranged at an inner side of one of the housing covers that is penetrated from the actuator pivot, where the inner side faces the drive gear and another drive gear (16B).

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die Erfindung betrifft eine Zahnradpumpe mit den Merkmalen des Oberbegriffs des Anspruchs 1. Demnach ist eine Zahnradpumpe vorgesehen mit mindestens zwei im Außeneingriff kämmenden Zahnrädern, die mit ihren Flachseiten direkt oder indirekt an Gehäusedeckeln der Zahnradpumpe anliegen. Zumindest ein Antriebszahnrad ist mit Wellenzapfen versehen und drehfest damit verbunden, wobei die Wellenzapfen beidseitig des mindestens einen Antriebszahnrades angeordnet und in dem jeweils benachbarten Gehäusedeckel drehgelagert sind. Einer der Wellenzapfen des Antriebszahnrades ist verlängert und als Antriebsdrehzapfen durch den benachbarten Gehäusedeckel nach außen geführt. Um das Austreten von zu pumpendem Fluid zu verhindern, ist eine Wellendichtung für den Antriebsdrehzapfen vorgesehen. Diese wirkt abdichtend zwischen dem Antriebsdrehzapfen und dem von ihm durchdrungenen Gehäusedeckel und ist auf der den Pumpenzahnrädern zugewandten Innenseite des von dem Antriebsdrehzapfen durchdrungenen ersten Gehäusedeckels in einer zahnradseitigen Aussparung des Gehäusedeckels angeordnet.The invention relates to a gear pump with the features of the preamble of claim 1. Accordingly, a gear pump is provided with at least two externally meshing gears, which bear with their flat sides directly or indirectly on housing covers of the gear pump. At least one drive gear is provided with shaft journal and rotatably connected thereto, wherein the shaft journals are arranged on both sides of the at least one drive gear and rotatably mounted in the respective adjacent housing cover. One of the shaft journals of the drive gear is extended and guided as a drive pivot through the adjacent housing cover to the outside. To prevent the escape of fluid to be pumped, a shaft seal is provided for the drive pivot. This acts sealingly between the drive pivot and the housing cover penetrated by it and is on the pump gear wheels facing the inside of the penetrated by the drive pivot pin first Housing cover arranged in a gear-side recess of the housing cover.

TECHNOLOGISCHER HINTERGRUNDTECHNOLOGICAL BACKGROUND

Zahnradpumpen der vorbeschriebenen Art sind in ihrem Grundprinzip seit Jahrzehnten bekannt und werden unter anderem zum Antreiben hydraulischer Systeme in der Fahrzeugtechnik eingesetzt, wo ein hoher Wirkungsgrad bei einfacher und kostengünstiger Herstellung sowie das Erzeugen hoher Drücke im Vordergrund stehen. Der Aufbau und das Wirkungsprinzip einer Zahnradpumpe ist besonders anschaulich in der DE 24 11 492 C2 beschrieben. Die Pumpe ist aus drei plattenförmigen Gehäuseteilen aufgebaut, weshalb solche Pumpen auch als "Plattenpumpen" bezeichnet werden. Von den sandwichartig zusammengesetzten Platten nimmt die mittlere die Pumpenkammer mit dem in diesem Fall zwei Pumpenzahnrädern auf (Pumpenplatte). Beidseitig der Pumpenplatte liegen an ihr dichtend Gehäusedeckel an, die den Pumpenraum in Axialrichtung verschließen (erste und zweite Deckelplatte). In den gegenüberliegenden Deckelplatten befinden sich miteinander fluchtend angeordnete Bohrungen zur Aufnahme von Wellenzapfen, die beidseitig zumindest das Antriebszahnrad axial überstehen und mit diesem drehfest verbunden sind. Die die Wellenzapfen aufnehmenden Bohrungen in den Deckelplatten weisen ein geringes Übermaß gegenüber dem Zapfendurchmesser auf, so dass bei geringem Spaltmaß ein gewisses radiales Lagerspiel zwischen den Drehzapfen und den Gehäusedeckeln verbleibt. Zur Gehäuseaußenseite hin sind drei der Lagerbohrungen durch je einen Deckel dichtend verschlossen. Die zu pumpende Flüssigkeit, die in den Lagerspalt eintritt und diesen dadurch schmiert, kann also nicht nach außerhalb der Pumpe austreten. Damit auch seitens des Antriebsdrehzapfens, der durch den Gehäusedeckel nach außerhalb des Pumpengehäuses geführt ist, keine zu pumpende Flüssigkeit austreten kann, besitzt der Gehäusedeckel an dieser Stelle eine Stopfbuchse oder dergleichen zur Aufnahme einer Wellendichtung. Auch der Antriebsdrehzapfen bleibt daher mit Flüssigkeit geschmiert Eine solche Wellendichtung ist zwar in der DE 24 11 492 C2 , da an sich bekannt, als solche nicht dargestellt, sondern nur ihr Aufnahmeraum. Solche Wellendichtungen waren, z.B. schon aus der DE 81 01 898 U1 an Plattenpumpen bekannt. Auf diese Weise sind alle vier Wellenzapfen der Pumpenzahnräder hydraulisch durch die zu pumpende Flüssigkeit gelagert und gegen Verschleiß geschützt, wobei aufgrund des sich mit den Pumpenzahnrädern mitdrehenden Wellenzapfens ein sich ständig austauschender Oberflächenfilm von der zu pumpenden Flüssigkeit auf den Radialflächen der Wellenzapfen befindet.Gear pumps of the type described above are known in their basic principle for decades and are used, inter alia, for driving hydraulic systems in vehicle technology, where high efficiency with simple and cost-effective production and the generation of high pressures in the foreground. The construction and the principle of operation of a gear pump is particularly clear in the DE 24 11 492 C2 described. The pump is constructed of three plate-shaped housing parts, which is why such pumps are also referred to as "plate pumps". Of the sandwiched plates, the middle takes up the pump chamber with the two pump gears in this case (pump plate). On both sides of the pump plate are at her sealing housing cover, which close the pump chamber in the axial direction (first and second cover plate). In the opposite cover plates are mutually aligned bores for receiving shaft journals, which protrude axially on both sides at least the drive gear and are rotatably connected thereto. The shaft journal receiving holes in the cover plates have a slight oversize relative to the pin diameter, so that with a small gap a certain radial clearance between the pivot and the housing covers remains. To the outside of the housing, three of the bearing bores are sealed by a lid. The liquid to be pumped, which enters the bearing gap and thereby lubricates it, so can not escape to the outside of the pump. Thus, on the part of the drive pivot pin, which is guided by the housing cover to the outside of the pump housing, no liquid to be pumped can escape, the housing cover has at this point a stuffing box or the like for receiving a shaft seal. Even the drive pivot therefore remains lubricated with liquid Such a shaft seal is indeed in the DE 24 11 492 C2 as known per se, not shown as such, but only their receiving space. Such shaft seals were, eg already from the DE 81 01 898 U1 known on plate pumps. In this way, all four shaft journals of the pump gears are hydraulically supported by the liquid to be pumped and protected against wear, and due to the rotating with the pump gears shaft journal is a constantly exchanging surface film of the liquid to be pumped on the radial surfaces of the shaft journals.

Derartige Pumpen können an sich auch für problematische Pumpflüssigkeiten, wie Klebstoffe verwendet werden. Es hat sich allerdings gezeigt, dass, insbesondere reaktive, Klebstoffe wie z.B. PUR-Klebstoffe zu einem schnellen Altern der Wellendichtung führen.Such pumps can also be used for problematic pumping liquids, such as adhesives. However, it has been found that, especially reactive adhesives such as e.g. PUR adhesives lead to rapid aging of the shaft seal.

Eine Zahnrad- oder Plattenpumpe wird auch in der DE 81 01 898 U1 beschrieben. Zur Reduzierung der Leckverluste im Eingriffbereich der fördernden Zahnräder wird dort vorgeschlagen, mit Druck beaufschlagte Kolben stirnseitig gegen die Zahnräder im Eingriffbereich anzudrücken. Die Druckwirkung kann aus einer in axialer Richtung wirkender Federkraftbeaufschlagung der Kolben oder aus dem hydrostatischen Druck des zu fördernden Fluides entnommen werden. Zur Abdichtung der Hochdruckseite der Kolben gegenüber der Niederdruckseite sind Dichtungsringe vorgesehen, die in einem druckbelasteten Ringraum angeordnet sind. Nachteilig an einer solchen Anordnung ist neben einem hohen Reinigungsaufwand, dass die Stirnseite der fördernden Zahnräder durch die Wirkung der Kolben einem starken Verschleiß ausgesetzt werden.A gear or plate pump is also used in the DE 81 01 898 U1 described. To reduce the leakage in the engagement region of the promotional gears there is proposed to pressurize piston end face against the gears in the engagement area. The pressure effect can be taken from an acting in the axial direction Federkraftbeaufschlagung the piston or from the hydrostatic pressure of the fluid to be delivered. To seal the high pressure side of the piston against the low pressure side sealing rings are provided, which are arranged in a pressure-loaded annular space. A disadvantage of such an arrangement is in addition to a high cleaning effort that the front side of the promotional gears are exposed by the action of the pistons heavy wear.

Eine demgegenüber einfacher zu reinigende (Dosier-)Zahnradpumpe kann der US 6,857,860 B1 entnommen werden. Die Dichtung des Fördervolumens gegenüber dem Pumpengehäuse und gegenüber der Antriebswelle erfolgt durch einen in einer Ausnehmung einer Gehäuseplatte angeordneten Dichtring, der an das antreibende Zahnrad angedrückt wird, welches mit der Welle drehfest verbunden ist. Das Andrücken erfolgt mit Federkraft. Zusätzlich kann vorgesehen sein, die den Dichtring aufnehmende Ausnehmung mit einer unter Druck stehenden Dichfflüssigkeit zu beaufschlagen. Auch bei dieser Dosier-Zahnradpumpe wird die Stirnseite des antreibenden Zahnrades durch den mit mechanischem oder hydrostatischem Druck beaufschlagten Dichtring starken mechanischen Belastungen ausgesetzt, die einer Verschleißreduzierung der Pumpe, insbesondere jedoch des Zahnrades, abträglich sind.A contrast easier to clean (metering) gear pump can the US Pat. No. 6,857,860 B1 be removed. The seal of the delivery volume relative to the pump housing and with respect to the drive shaft is effected by a sealing ring arranged in a recess of a housing plate, which is pressed against the driving gear, which is non-rotatably connected to the shaft. The pressing is done by spring force. In addition, it can be provided that the recess receiving the sealing ring is subjected to a pressurized sealing liquid. Also in this metering gear pump, the front side of the driving Gear exposed by the acted upon by mechanical or hydrostatic pressure sealing ring strong mechanical loads, which are a wear reduction of the pump, but in particular of the gear, detrimental.

Eine konstruktiv aufwändigere Zahnradpumpe mit vorzugsweise drei Zahnrädern kann der DE 69 24 726 U entnommen werden. Dort werden die fördernden Zahnräder durch ein drittes Zahnrad angetrieben, welches mit dem antreibenden Zahnrad in Eingriff steht, wobei der Antrieb auf der Niederdruckseite des Fördervolumens erfolgt. Die Anordnung der Antriebswelle auf der Niederdruckseite der Pumpe führt zu geringeren Anforderungen an die dichtende Wirkung der Dichtung. In dem Gehäusedeckel ist eine Ausnehmung vorgesehen, in die zur Fixierung der Zahnräder eine Platte einsetzbar ist.A structurally complex gear pump with preferably three gears can the DE 69 24 726 U be removed. There, the conveying gears are driven by a third gear, which is in engagement with the driving gear, wherein the drive takes place on the low pressure side of the delivery volume. The arrangement of the drive shaft on the low pressure side of the pump leads to lower demands on the sealing effect of the seal. In the housing cover, a recess is provided, in which a plate can be used for fixing the gears.

Eine zur Förderung nicht selbst schmierender Medien geeignete Zahnradpumpe kann der DE 19 27 514 U1 entnommen werden. Damit die Zahnräder sich innerhalb des zu fördernden Volumens der Pumpe nicht berühren, werden demnach die Zahnräder einzeln und synchron angetrieben. Der synchrone Antrieb erfolgt in einem dem zu fördernden Volumen vorgelagerten Getriebegehäuse, welches gegenüber dem zu fördernden Volumen öldicht abgeschlossen ist. Die Dichtungen sind dabei so angeordnet, dass sie von dem zu fördernden Volumen aus zugänglich sind.A suitable for promoting not self-lubricating media gear pump can the DE 19 27 514 U1 be removed. Thus, the gears do not touch within the pumped volume of the pump, therefore, the gears are driven individually and synchronously. The synchronous drive is carried out in a the volume to be delivered upstream gear housing, which is closed to the oil volume to be delivered. The seals are arranged so that they are accessible from the volume to be delivered.

Eine Zahnradpumpe mit einem beweglich auf der Antriebswelle gelagerten ersten Zahnrad, welches mit einem im Gehäuse ohne Welle gelagerten zweiten Zahnrad in Eingriff steht, kann der DE 18 22 807 U entnommen werden. Die Lagerung der Antriebswelle erfolgt durch zwei Kugellager, welche in axialer Richtung zueinander beabstandet in einer Gehäusekammer angeordnet sind. Die Kammer ist von dem zu fördernden Volumen durch eine Dichtungspackung abgedichtet.A gear pump with a movably mounted on the drive shaft first gear, which is in engagement with a bearing mounted in the housing without a second gear, the DE 18 22 807 U be removed. The bearing of the drive shaft is effected by two ball bearings, which are arranged spaced apart in the axial direction in a housing chamber. The chamber is sealed from the volume to be delivered by a packing.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Davon ausgehend liegt der Erfindung das Problem zugrunde bei einer gattungsgemäßen Pumpe die Lebensdauer der Wellendichtung für den Antriebsdrehzapfen zu verlängern, so dass eine weitgehende Wartungsarmut auch für problematische zu pumpende Fluide erreicht wird.On this basis, the invention is based on the problem in a generic pump to extend the life of the shaft seal for the drive pivot, so that a low maintenance is achieved even for problematic fluids to be pumped.

Zur Lösung dieser Aufgabe wird eine Zahnradpumpe mit den Merkmalen des Anspruchs 1 vorgeschlagen. Demnach ist vorgesehen, dass die Aussparung mit einer auf der dem Pumpenraum zugewandten Seite angeordneten Vorkammer versehen ist, wobei die Vorkammer die Wellendichtung mit ständig sich austauschendem zu pumpendem Fluid versorgt.To solve this problem, a gear pump with the features of claim 1 is proposed. Accordingly, it is provided that the recess is provided with an arranged on the side facing the pump chamber prechamber, wherein the prechamber supplies the shaft seal with constantly exchanging fluid to be pumped.

Es hat sich überraschender Weise gezeigt, dass verkürzte Lebensdauern der Wellendichtung auch beim Pumpen problematischer Pumpflüssigkeiten nicht mehr auftreten, wenn die Wellendichtung von der Außenseite des betroffenen Gehäusedeckels auf dessen Innenseite in eine Aussparung mit einer Vorkammer verlagert wird. Z.B. treten störende Kristallbildungen, wie sie bei außenliegenden Wellendichtungen beobachtet wurden, bei der Erfindung nicht mehr auf.It has surprisingly been found that shortened lifetimes of the shaft seal no longer occur even when pumping problematic pumping liquids when the shaft seal is displaced from the outside of the affected housing cover on the inside in a recess with a prechamber. For example, disturbing crystal formations, as observed in external shaft seals, no longer occur in the invention.

Wenn die Radiallagerung des Antriebsdrehzapfens wegen nunmehr fehlender Schmierung des Passspaltes zum Gehäusedeckel unzureichend ist, kann eine weitere Verbesserung, die sich auch auf die Haltbarkeit der Wellendichtung auswirkt, dadurch erreicht werden, dass anstelle des Passspaltes zwischen dem Drehantriebszapfen und dem betreffenden Gehäusedeckel eine Lagerbuchse eingesetzt wird, welche die radialen Lagerkräfte aufnimmt und für eine gute reibungsarme Lagerung sorgt und die innen liegende Wellendichtung besser vor radialen Belastungen schützt. Bei der Lagerbuchse kann es sich um unterschiedliche Mittel zu Drehlagerung, wie Gleitlager oder Drehlager, handeln.If the radial bearing of the drive pivot pin is insufficient because of now lack of lubrication of the fitting gap to the housing cover, a further improvement, which also affects the durability of the shaft seal can be achieved by using a bearing bush instead of the fitting gap between the rotary drive pin and the housing cover in question , which absorbs the radial bearing forces and ensures good low-friction bearing and the inner shaft seal better protects against radial loads. In the bearing bush can be different means for pivot bearing, such as plain bearings or pivot bearings act.

Alternativ zu einer solchen Lagerbuchse ist es auch möglich, den außerhalb des betroffenen Gehäusedeckels liegenden Teil des Antriebsdrehzapfens mit einem Vorgelege in Gestalt einer antriebsseitig drehgedichteten Kammer zu versehen. Diese kann bei Bedarf mit einem Fluid zur Schmierung befüllt werden. Trockenlaufprobleme im Passspalt zwischen dem Antriebsdrehzapfen und dem zugehörigen Gehäusedeckel können dadurch völlig ausgeschlossen werden. Unter Umständen wird auch die Lagerung des Antriebsdrehzapfens verbessert.As an alternative to such a bearing bush, it is also possible to provide the outside of the affected housing cover part of the drive pivot pin with a countershaft in the form of a drive side rotary sealed chamber. This can be filled if necessary with a fluid for lubrication. Dry running problems in the fitting gap between the drive pivot and the associated housing cover can be completely excluded. Under certain circumstances, the storage of the drive pivot is improved.

Die vorgenannten sowie die beanspruchten und in den Ausführungsbeispielen beschriebenen erfindungsgemäß zu verwendenden Bauteile unterliegen in ihrer Größe, Formgestaltung, Materialauswahl und technischen Konzeption keinen besonderen Ausnahmebedingungen, so dass die in dem Anwendungsgebiet bekannten Auswahlkriterien uneingeschränkt Anwendung finden könnenThe above-mentioned and the claimed components to be used according to the invention described in the exemplary embodiments are not subject to special conditions of size, shape, material selection and technical design, so that the selection criteria known in the field of application can be used without restriction

Weitere Einzelheiten, Merkmale und Vorteile des Gegenstandes der Erfindung ergeben sich aus den Unteransprüchen, sowie aus der nachfolgenden Beschreibung der zugehörigen Zeichnung und Tabelle, in der - beispielhaft - ein Ausführungsbeispiel einer Zahnradpumpe dargestellt ist. Auch einzelne Merkmale der Ansprüche oder der Ausführungsformen können mit anderen Merkmalen anderer Ansprüche und Ausführungsformen kombiniert werden.Further details, features and advantages of the subject matter of the invention will become apparent from the dependent claims, as well as from the following description of the accompanying drawings and table, in which - by way of example - an embodiment of a gear pump is shown. Also, individual features of the claims or of the embodiments may be combined with other features of other claims and embodiments.

KURZBESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

In der Zeichnung zeigen

Fig. 1
eine Zahnradpumpe in einer ersten Ausführungsform in Seitenansicht, zum Teil aufgebrochen:
Fig. 2A
eine zweite Ausführungsform einer Zahnradpumpe in der gleichen Darstellungsart mit einem Vorgelege,
Fig. 2B
von der zweiten Ausführungsform eine andere Bauart in Axialschnitt- ansicht sowie
Fig. 3
eine dritte, mehrstufige Ausführungsform einer Zahnradpumpe in Axialschnittansicht.
In the drawing show
Fig. 1
a gear pump in a first embodiment in side view, partially broken:
Fig. 2A
a second embodiment of a gear pump in the same representation with a countershaft,
Fig. 2B
from the second embodiment of another type in axial section view and
Fig. 3
a third, multi-stage embodiment of a gear pump in axial section view.

DETAILLIERTE FIGURENBESCHREIBUNGDETAILED FIGURE DESCRIPTION

Die in Figuren 1 und 2A/B insgesamt mit 10 bezeichnete Zahnradpumpe ist als Plattenpumpe ausgebildet, bei der beidseitig einer Pumpenplatte 12 erste und zweite plattenförmige Gehäusedeckel 14A, 14B dichtend an die Pumpenplatte 12 angelegt sind. Zwei im Außeneingriff kämmende Pumpenzahnräder 16A, 16B sind in an sich bekannten und einander überschneidenden zylindrischen Durchbrechungen der Pumpenplatte 12 angeordnet. Das antriebsseitige Pumpenzahnrad 16A ist drehfest mit einer Antriebswelle 18 verbunden. Diese weist (in der Zeichnung links) antriebsseitig einen den Gehäusedeckel 14A nach außen überragenden Antriebsdrehzapfen 18A auf. Auf der dem Antrieb gegenüberliegenden Seite des Pumpenzahnrades 16A weist die Antriebswelle einen Wellenzapfen 18B auf, der in einer damit fluchtenden Passbohrung 32A des zweiten (hinteren) Gehäusedeckels 14B mit geringem radialen Spaltmaß drehgelagert ist. Diese Bohrung kann als Sackbohrung ausgeführt sein oder anderweitig stirnendseitig gegenüber dem Pumpenraum gedichtet sein.In the FIGS. 1 and 2A / B generally designated 10 gear pump is designed as a plate pump, in which both sides of a pump plate 12 first and second plate-shaped housing cover 14A, 14B are sealingly applied to the pump plate 12. Two externally meshing pump gears 16A, 16B are arranged in known and intersecting cylindrical openings of the pump plate 12. The drive-side pump gear 16 A is rotatably connected to a drive shaft 18. This has (in the drawing on the left) on the drive side a housing cover 14A outwardly projecting drive pivot pin 18A. On the drive opposite side of the pump gear 16A, the drive shaft has a shaft journal 18B rotatably supported in a mating bore 32A of the second (rear) housing cover 14B with a small radial gap. This bore can be designed as a blind bore or otherwise be sealed against the end face of the pump space.

Das mit dem ersten Pumpenzahnrad 16A kämmende zweite Pumpenzahnrad 16B kann in an sich beliebiger Weise radial und axial gelagert sein. Der Eintritt des Pumpfluids erfolgt z.B. über eine seitliche Eintrittsöffnung 20 der Pumpenplatte 2 etwa im Kontaktbereich der beiden Pumpenzahnräder. Die Austrittsöffnung liegt in der Regel diametral gegenüberliegend zur Eintrittsöffnung 20. Die antriebsseitige Drehlagerung der Antriebswelle 18 erfolgt bei dem Ausführungsbeispiel nach Figur 1 über eine Lagerbuchse 22, die auf der von der Pumpenplatte 12 gegenüberliegenden Seite in den ersten (vorderen) Gehäusedeckel 14A eingelassen ist. Hierbei kann es sich zum Beispiel um ein selbstschmierendes Gleitlager oder um ein Wälzlager handeln.The second pump gear 16B meshing with the first pump gear 16A may be radially and axially supported in any desired manner. The entry of the pumping fluid takes place for example via a lateral inlet opening 20 of the pump plate 2 approximately in the contact region of the two pump gears. The outlet opening is generally diametrically opposite to the inlet opening 20. The drive-side rotary mounting of the drive shaft 18 takes place in the embodiment according to FIG. 1 via a bearing bush 22, which is recessed into the first (front) housing cover 14A on the side opposite the pump plate 12. in this connection it may, for example, be a self-lubricating plain bearing or a roller bearing.

Nach den Ausführungsbeispielen befindet sich auf der der Pumpenplatte 12 zugewandten Seite des ersten (vorderen) Gehäusedeckels 14A eine Gehäusedeckelaussparung 24, in der eine Ringdichtung als Wellendichtung 26 zur radialen Abdichtung der Antriebswelle 18 gegenüber der Pumpenkammer und dem ersten (vorderen) Gehäusedeckel 14A dient. Eine zur Pumpenkammer hin sich, vorzugsweise konisch, erweiternde Vorkammer 24A der Aussparung 24 versorgt die Wellendichtung 26 mit ständig sich austauschendem zu pumpenden Fluid.According to the embodiments located on the pump plate 12 side facing the first (front) housing cover 14A a housing cover recess 24 in which a ring seal as a shaft seal 26 for radial sealing of the drive shaft 18 relative to the pump chamber and the first (front) housing cover 14A is used. A towards the pump chamber towards, preferably conically, expanding antechamber 24A of the recess 24 provides the shaft seal 26 with constantly exchanging fluid to be pumped.

Bei dem Ausführungsbeispiel nach Figur 2A ist anstelle der Lagerbuchse 22 ein radialer Passspalt zwischen der Antriebswelle 18 und dem ersten (vorderen) Gehäusedeckel 14A vorgesehen. Antriebsseitig ist der Antriebsdrehzapfen 18A von einem Vorgelege 28 mit einer zum Antriebsdrehzapfen 18A offenen Kammer 28A umgeben, die über Radialbohrungen 28B, 28C mit einem Schmiermittel beaufschlagbar ist. Am antriebsseitigen Ende des Vorgeleges 28 dichtet eine Wellendichtung 30 die Kammer 28A gegenüber dem außerhalb liegenden Teil der Antriebswelle 18 fluidisch ab.According to the embodiment FIG. 2A instead of the bearing bush 22, a radial fitting gap is provided between the drive shaft 18 and the first (front) housing cover 14A. On the drive side, the drive pivot pin 18A is surrounded by a countershaft 28 with a chamber 28A which is open toward the drive pivot pin 18A and can be acted upon by lubricant via radial bores 28B, 28C. At the drive-side end of the countershaft 28, a shaft seal 30 seals the chamber 28 A from the outer part of the drive shaft 18 fluidly.

Bei dem Ausführungsbeispiel nach Figur 2B ist vorgesehen, dass der zweite Gehäusedeckel 14B auf seiner Außenseite dicht an einer Pumpenplatte anliegt, wobei die Zu- und die Ableitung für zu pumpendes Fluid (nicht dargestellt) durch den zweiten Gehäusedeckel 14B hindurch erfolgt. Das zweite Pumpenzahnrad 16B sitzt mit dem notwendigen Radialspiel drehbar auf einer zweiten Welle 19, welche in dem ersten Gehäusedeckel 14A in einer Sackbohrung gelagert ist und drehfest in dem zweiten Gehäusedeckel 14B sitzt. Auch bei diesem Ausführungsbeispiel ist der Wellenzapfen 18B drehbar bezüglich des zweiten Gehäusedeckels 14B, wobei die in der Pumpenplatte 12 sich befindende Pumpenkammer 21 durch eine Pumpenkammerdichtung 21A gegenüber dem zweiten Gehäusedeckel 14B und dem Wellenzapfen 18B im Bedarfsfall abgedichtet sein kann. Schließlich ist die zahnradseitig in dem ersten Gehäusedeckel 14A angeordnete Wellendichtung 26 in axialer Richtung über einen Stützring 26A an dem zweiten Gehäusedeckel 14B angestützt.According to the embodiment FIG. 2B it is provided that the second housing cover 14B rests on its outside tightly against a pump plate, wherein the supply and the discharge for fluid to be pumped (not shown) through the second housing cover 14B through. The second pump gear 16B is seated with the necessary radial play rotatably on a second shaft 19 which is mounted in the first housing cover 14A in a blind bore and rotatably seated in the second housing cover 14B. Also in this embodiment, the shaft journal 18B is rotatable with respect to the second housing cover 14B, wherein the pump chamber 21 located in the pump plate 12 may be sealed by a pump chamber seal 21A against the second housing cover 14B and the shaft journal 18B if necessary. Finally, the gear wheel side arranged in the first housing cover 14A shaft seal 26 in axial Direction via a support ring 26A supported on the second housing cover 14B.

Die in Figur 1 gezeigte Ausführungsform kann in ähnlicher Weise abgewandelt werden, wie die Ausführungsform der Figur 2B im Verhältnis zu derjenigen in Figur 2A, wobei die Lagerbuchse 22 ihrem Umfang nach auch deutlich größer sein kann als in Figur 1, so dass gebräuchliche Nadellager als Lagerbuchse 22 Verwendung finden können, wobei ein das Nadellager aufnehmendes Gehäuseteil und das Nadellager zum Teil innerhalb des ersten Gehäusedeckels 14A und zum Teil außerhalb desselben erstreckt sein können. Erfindungsgemäß verwendete Lagerbuchsen 22 können, insbesondere in einer Ausführung als Wälzlager auch pumpenseitig oder beidseitig mit zusätzlichen Wellendichtungen versehen sein. Die möglichen Umrisse einer Lagerbuchse 22 in Gestalt eines durch ein Gehäuse gekapseltes Nadellager sind in Figur 1 in gestrichelter Form als Alternative eingezeichnet.In the FIG. 1 The embodiment shown can be modified in a similar manner as the embodiment of the FIG. 2B in relation to those in FIG. 2A , wherein the bearing bush 22 may also be significantly larger in circumference than in FIG. 1 so that common needle roller bearings can be used as a bearing bushing 22, wherein a housing part receiving the needle roller bearing and the needle roller bearing may be partially extended within the first housing cover 14A and partly outside thereof. Bearing bushes 22 used in accordance with the invention can, in particular in one embodiment, also be provided as pump bearings on the pump side or on both sides with additional shaft seals. The possible outlines of a bearing bush 22 in the form of a encapsulated by a housing needle roller bearings are in FIG. 1 drawn in dashed form as an alternative.

Einen Schnitt durch eine mehrstufige Zahnradpumpe 10 kann der Fig. 3 entnommen werden, wobei die Antriebswelle 18 in axialer Hintereinanderfolge mit zumindest 2 Zahnrädern 16A, 16A' durch Passfedern 18D verbunden ist. Die Zahnräder 16A, 16A' stehen jeweils mit mehreren umfangsverteilt angeordneten Pumpenzahnrädern 16B, 16B' sowie 16B", 16B"' in Eingriff. Die Pumpenzahnräder sind auf einer zweiten Welle 19 und einer dritten Welle 19' angeordnet. Die Wellen 19, 19' sind in zylindrischen Durchbrechungen der Pumpenplatten 12 und 12' angeordnet. Durch die mehrstufige Ausführung kann das Fördervolumen der Pumpe gemäß Fig. 3 gegenüber dem Volumen einer Pumpe gemäß der Figuren 1, 2A oder 2B vervielfacht werden. Beispielsweise ist gemäß Fig. 3 etwa eine Vervierfachung oder Verachtfachung des Fördervolumens möglich.A section through a multi-stage gear pump 10, the Fig. 3 are removed, wherein the drive shaft 18 is connected in axial succession with at least 2 gears 16A, 16A 'by keyways 18D. The gears 16A, 16A 'are respectively engaged with a plurality of circumferentially distributed pump gears 16B, 16B' and 16B ", 16B"'. The pump gears are arranged on a second shaft 19 and a third shaft 19 '. The shafts 19, 19 'are arranged in cylindrical openings of the pump plates 12 and 12'. Due to the multi-stage design, the delivery volume of the pump according to Fig. 3 relative to the volume of a pump according to the FIGS. 1 . 2A or 2 B be multiplied. For example, according to Fig. 3 about a fourfold or eightfold increase in the delivery volume possible.

Der Fig. 3 ist zu entnehmen, dass in dem Gehäusedeckel 14A zahnradseitig eine Aussparung 24 vorgesehen ist, in der eine Wellendichtung 26 angeordnet ist. Die Aussparung 24 ist mit einer auf der dem Pumpenraum zugewandten Seite angeordneten Vorkammer 24A versehen. Dadurch ist die Wellendichtung 26 mit ständig sich austauschendem zu pumpendem Fluid versorgbar.Of the Fig. 3 It can be seen that in the housing cover 14A gear side, a recess 24 is provided, in which a shaft seal 26 is arranged. The recess 24 is provided with an on the pump chamber facing side arranged prechamber 24A. As a result, the shaft seal 26 can be supplied with constantly exchanging fluid to be pumped.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

1010
Zahnradpumpegear pump
12, 12'12, 12 '
Pumpenplattepump plate
14A14A
erster Gehäusedeckelfirst housing cover
14B14B
zweiter Gehäusedeckelsecond housing cover
16A, 16A'16A, 16A '
erstes Pumpenzahnrad (Antriebszahnrad)first pump gear (drive gear)
16B, 16B', 16B", 16B"'16B, 16B ', 16B ", 16B"'
zweites Pumpenzahnradsecond pump gear
1818
Antriebswelledrive shaft
18A18A
AntriebsdrehzapfenDrive trunnion
18B18B
Wellenzapfenshaft journal
18C18C
PassfederAdjusting spring
18D18D
PassfederAdjusting spring
19, 19'19, 19 '
zweite Wellesecond wave
2020
Eintrittsöffnunginlet opening
2121
Pumpenkammerpump chamber
21A21A
PumpenkammerdichtungPump chamber seal
2222
Lagerbuchsebearing bush
2424
Aussparungrecess
24A24A
Vorkammerantechamber
2626
Wellendichtungshaft seal
26A26A
Stützringsupport ring
2828
Vorgelegecountershaft
28A28A
Kammerchamber
28B/C28B / C
radiale Bohrungenradial bores
3030
Wellendichtungshaft seal
32A32A
Passbohrungfitting bore
32B32B
Passbohrungfitting bore

Claims (4)

Zahnradpumpe - mit mindestens zwei im Außeneingriff kämmenden Zahnrädern (16A, 16B), die mit ihren Flachseiten an ersten und zweiten Gehäusedeckeln (14A, 14B) der Zahnradpumpe anliegen, - mit Wellenzapfen, die zumindest mit dem Antriebszahnrad (16A) drehfest verbunden sind und beidseitig des Antriebszahnrades (16A) in dem ersten bzw. zweiten Gehäusedeckel (14A, 14B) drehgelagert sind, - mit einem durch den ersten Gehäusedeckel (14A) nach außen geführten Antriebsdrehzapfen (18A) und - mit einer den Antriebsdrehzapfen (18A) gegenüber dem von ihm durchdrungenen Gehäusedeckel (14A) abdichtenden und das Austreten von zu pumpendem Fluid verhindernden Wellendichtung, die auf der den Pumpenzahnrädern (16A, 16B) zugewandten Innenseite des von dem Antriebsdrehzapfen (18A) durchdrungenen ersten Gehäusedeckels (14A) in einer zahnradseitigen Aussparung (24) des Gehäusedeckels (14A) angeordnet ist, dadurch gekennzeichnet, dass die Aussparung (24) mit einer auf der dem Pumpenraum zugewandten Seite angeordneten Vorkammer (24A) versehen ist, wodurch die Wellendichtung (26) mit ständig sich austauschendem zu pumpendem Fluid versorgbar ist. gear pump - With at least two externally meshing gears (16 A, 16 B), which abut with their flat sides on first and second housing covers (14 A, 14 B) of the gear pump, - With shaft journals which are at least in rotation with the drive gear (16A) and rotatably mounted on both sides of the drive gear (16A) in the first and second housing cover (14A, 14B), - With a through the first housing cover (14 A) outwardly guided drive pivot (18 A) and - with a the drive pivot (18A) against the penetrated by him housing cover (14A) sealing and the leakage of fluid to be pumped preventing shaft seal on the pump gears (16A, 16B) facing the inside of the drive pivot (18A) penetrated by the first housing cover (14A) in a gear-side recess (24) of the housing cover (14A) is arranged, characterized in that the recess (24) with a pump chamber on the side facing the pre-chamber (24A) is provided, whereby the shaft seal (26) constantly replaceable fluid to be pumped is supplied. Zahnradpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Vorkammer (24A) sich zur Pumpenkammer hin, vorzugsweise konisch, erweitert.Gear pump according to claim 1, characterized in that the prechamber (24A) extends towards the pump chamber, preferably conically. Zahnradpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der erste Gehäusedeckel (14 A) an seiner Außenseite mit einer den Antriebsdrehzapfen (18A) lagernden Lagerbuchse (22) versehen ist.Gear pump according to claim 1 or 2, characterized in that the first housing cover (14 A) on its outer side with a drive pivot (18A) overlapping bearing bush (22) is provided. Zahnradpumpe nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine auf der Außenseite des ersten Gehäusedeckels (14A) vorgesehene, den Antriebsdrehzapfen (18A) umschließende Schmierstoffkammer (28A).Gear pump according to one of claims 1 to 3, characterized by an on the outside of the first housing cover (14A) provided for, the actuator pivot (18A) surrounding the lubricant chamber (28A).
EP10001269.9A 2009-02-06 2010-02-08 Gear wheel pump with shaft seal Active EP2216550B1 (en)

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DE202015006862U1 (en) 2015-10-02 2015-10-23 Beinlich Pumpen Gmbh Pump for hydraulic media
DE202023000769U1 (en) 2023-04-06 2023-08-09 SKTEC GmbH Gear pump with sealing system

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DE1822807U (en) 1959-01-15 1960-12-01 Kirk & Kompagni GEAR PUMP FOR HOMOGENIZERS.
DE1927514U (en) 1965-08-25 1965-11-18 Bayerische Motoren Werke Ag HEATING AND VENTILATION DEVICE FOR INSTALLATION IN FRONT OF OR UNDER THE DASHBOARD OF MOTOR VEHICLES.
DE6924726U (en) 1969-06-19 1969-10-16 V D O Tachometer Werke Adolf S GEAR PUMP OR MOTOR
DE8101898U1 (en) 1981-01-27 1982-07-15 Robert Bosch Gmbh, 7000 Stuttgart GEAR MACHINE (PUMPS OR MOTOR)
DE2411492C2 (en) 1974-03-11 1984-07-26 Robert Bosch Gmbh, 7000 Stuttgart Gear pump
US6857860B1 (en) 2000-05-08 2005-02-22 Pomtava Sa Metering pump for liquid products

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DE3312868C2 (en) * 1983-04-09 1986-03-20 Glyco-Antriebstechnik Gmbh, 6200 Wiesbaden Hydraulic pump
JP3169146B2 (en) * 1992-08-06 2001-05-21 株式会社豊田自動織機製作所 Vehicle heating system
CA2176404A1 (en) * 1996-05-08 1997-11-09 Yuri Belman Gear pump and seal for use therewith adapted for use in vacuum applications
DE19942297A1 (en) * 1999-09-04 2001-03-08 Bosch Gmbh Robert Gear machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1822807U (en) 1959-01-15 1960-12-01 Kirk & Kompagni GEAR PUMP FOR HOMOGENIZERS.
DE1927514U (en) 1965-08-25 1965-11-18 Bayerische Motoren Werke Ag HEATING AND VENTILATION DEVICE FOR INSTALLATION IN FRONT OF OR UNDER THE DASHBOARD OF MOTOR VEHICLES.
DE6924726U (en) 1969-06-19 1969-10-16 V D O Tachometer Werke Adolf S GEAR PUMP OR MOTOR
DE2411492C2 (en) 1974-03-11 1984-07-26 Robert Bosch Gmbh, 7000 Stuttgart Gear pump
DE8101898U1 (en) 1981-01-27 1982-07-15 Robert Bosch Gmbh, 7000 Stuttgart GEAR MACHINE (PUMPS OR MOTOR)
US6857860B1 (en) 2000-05-08 2005-02-22 Pomtava Sa Metering pump for liquid products

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DE202009001525U1 (en) 2010-06-24
ES2688647T3 (en) 2018-11-06
EP2216550A3 (en) 2016-07-27
PL2216550T3 (en) 2018-12-31
EP2216550B1 (en) 2018-07-25

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