EP3242039A1 - Fixing of a pump cover by notches formed in a casing wall, said notches engaging a shoulder of the cover - Google Patents

Fixing of a pump cover by notches formed in a casing wall, said notches engaging a shoulder of the cover Download PDF

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Publication number
EP3242039A1
EP3242039A1 EP17159213.2A EP17159213A EP3242039A1 EP 3242039 A1 EP3242039 A1 EP 3242039A1 EP 17159213 A EP17159213 A EP 17159213A EP 3242039 A1 EP3242039 A1 EP 3242039A1
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EP
European Patent Office
Prior art keywords
pump
pump housing
housing
cover
pump cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17159213.2A
Other languages
German (de)
French (fr)
Inventor
Paul Skljarow
Reinhard Dittmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3242039A1 publication Critical patent/EP3242039A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/60Mounting; Assembling; Disassembling
    • F04D29/62Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/406Casings; Connections of working fluid especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00Pumps with circumferential or transverse flow
    • F04D5/002Regenerative pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/30Retaining components in desired mutual position
    • F05D2260/36Retaining components in desired mutual position by a form fit connection, e.g. by interlocking

Definitions

  • the invention relates to a delivery unit according to the preamble of the main claim.
  • the disadvantage is that, as a result of the local deformations of the pump housing, deformations may also occur on the side of the pump cover facing the pump chamber, depending on the tool generating the deformations, which may affect the clearance for the impeller arranged in the pump chamber.
  • the delivery unit according to the invention with the characterizing features of the main claim has the advantage that deformations on the pump cover, in particular in the pump chamber, are avoided by the cut edges are each arched to your indentation.
  • the deformation of the pump housing is achieved by radially with respect to the pump axis dipping into the pump housing tools, the underside curved arched inwards.
  • the indentation generating tool is correspondingly formed with a tapered tool tip.
  • the indentations in the direction of the pump axis are pointed, triangular or semicircular. According to the advantageous embodiment, spatially seen result tetrahedral indentations.
  • the indentations are provided in the region of a flange of the pump housing.
  • the curling ensures that a prestressing force is built up between the pump cover and an intermediate housing. At the same time, the pump cover is centered.
  • this biasing force is further enhanced.
  • the indentations also serve to maintain this preload force at all operating temperatures and throughout the product life.
  • Fig.1 shows a three-dimensional partial view of a delivery unit with indentations according to the invention for attachment of a pump cover.
  • the delivery unit serves to convey a fluid.
  • the delivery unit is designed as an electric fuel pump.
  • the delivery unit comprises a cylindrical or pot-shaped pump housing 1 with an end opening 2, in which a pump cover 4 occluding the opening 2 is arranged.
  • the pump cover 4 is fixed and secured within the pump housing 1 in the axial direction with respect to a pump axis 7 of the delivery unit. This is achieved by crimping, ie bending over the edge of the opening 2 and through a plurality of local indentations 10 on the pump housing 1 distributed over the circumference of the pump housing 1, which are produced by local deformation of the pump housing 1 by means of corresponding tools 8.
  • a tool 8 is after Figure 3 pressed into the material of the pump housing 1 at the corresponding position in the radial direction with respect to the pump axis 7 and penetrates with a predetermined depth into the material and deforms this plastically.
  • the pump housing 1 is locally severed at the indentations 10 each at a cutting edge 12.
  • the indentations 10 are in the region of the flange 9 of the pump housing. 1
  • Fig.2 shows a sectional view of the delivery unit after Fig.1 with a recess according to the invention.
  • an intermediate housing 3 and the opening 2 closing the pump cover 4 are arranged in the opening 2 of the pump housing 1. Between the pump cover 4 and the intermediate housing 3, a pump chamber 5 is enclosed, in which an impeller 6 is rotatably mounted for fluid delivery.
  • the recesses 10 engage behind a shoulder 11 of the pump cover 4 and each have a tapered, the shoulder 11 of the pump cover 4 facing base.
  • the recesses 10 are formed, for example tetrahedral, wherein the shoulder 11 of the pump cover 4 facing triangular Area of the hollow tetrahedron is the base area.
  • the base can also be pointed, semi-circular or semi-oval.
  • the pump cover 4 is pressed by the indentations 10 of the pump housing 1 in the axial direction with respect to the pump axis 7 against the intermediate housing 3, wherein the intermediate housing 3 is supported on the pump housing 1, for example on a shoulder 15 of the pump housing 1. In this way, the between the Pump cover 4 and the intermediate housing 3 formed pump chamber 5 sealed.
  • the shoulder 11 of the pump cover 4 has, for example, a bevel 13 on the side facing away from the pump chamber 5 in order to ensure a certain prestressing force acting on the pump cover 4.
  • the cut edges 12 are arched in each case towards their indentation 10. In this way, the overlap between the pump housing 1 and the pump cover 4 is reduced, so that the mechanical loads on the pump cover 4 and thus also its deformation can be reduced.
  • FIG 3 shows three views of the tool for producing the indentations according to the invention Fig.1 and Fig.2 ,
  • the tool 8 has a longitudinal extension and at its free end a dome 16, which is pressed into the pump housing 1.
  • the dome 16 is executed pointed or rounded.
  • the tool 8 is curved inwards.
  • the top 16 has at the bottom 17 at its foremost end a flattening or chamfer 18.
  • the height H of the tool 8 thereby increases from the foremost tip 19 in the direction of the other end until a constant height H is reached.
  • the inwardly directed curvature of the tool 8 on its underside 17 generates a corresponding outwardly facing curvature at the cutting edge 12 of the respective indentation 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Es ist schon ein Förderaggregat bekannt, mit einem zylinderförmigen, eine Pumpenachse aufweisenden Pumpengehäuse und einem das Pumpengehäuse stirnseitig verschließenden Pumpendeckel. Der Pumpendeckel ist durch lokale Verformung des Pumpengehäuses im Pumpengehäuse fixiert, wobei die lokale Verformung des Pumpengehäuses durch mehrere über den Umfang des Pumpengehäuses verteilte lokale Einbuchtungen erreicht ist, die eine Schulter des Pumpendeckels hintergreifen und bei denen das Pumpengehäuse jeweils an einer geradlinigen Schnittkante lokal durchtrennt ist. Der Pumpendeckel wird durch die lokalen Einbuchtungen im Pumpengehäuse in axialer Richtung gegen ein im Pumpengehäuse angeordnetes, ein Laufrad des Förderaggregates umfassendes Zwischengehäuse gedrückt. Auf diese Weise ist eine zwischen dem Pumpendeckel und dem Zwischengehäuse gebildete Pumpenkammer abgedichtet. Nachteilig ist, dass durch die lokalen Verformungen des Pumpengehäuses abhängig von dem die Verformungen erzeugenden Werkzeug auch Verformungen auf der der Pumpenkammer zugewandten Seite des Pumpendeckels entstehen können, die den Spielraum für das in der Pumpenkammer angeordnete Laufrad beeinträchtigen können. Bei dem erfindungsgemäßen Förderaggregat werden Verformungen am Pumpendeckel, insbesondere im Bereich der Pumpenkammer, vermieden. Erfindungsgemäß ist vorgesehen, dass die Schnittkanten (12) jeweils zu Ihrer Einbuchtung (10) hin gewölbt sind.It is already a delivery unit known, with a cylindrical pump housing having a pump housing and the pump housing frontally occlusive pump cover. The pump cover is fixed by local deformation of the pump housing in the pump housing, wherein the local deformation of the pump housing is achieved by a plurality of distributed over the circumference of the pump housing local indentations, which engage behind a shoulder of the pump cover and in which the pump housing is severed locally at a straight cutting edge , The pump cover is pressed by the local indentations in the pump housing in the axial direction against an arranged in the pump housing, an impeller of the delivery aggregate comprehensive intermediate housing. In this way, a pump chamber formed between the pump cover and the intermediate housing is sealed. The disadvantage is that, as a result of the local deformations of the pump housing, deformations may also occur on the side of the pump cover facing the pump chamber, depending on the tool generating the deformations, which may affect the clearance for the impeller arranged in the pump chamber. In the delivery unit according to the invention, deformations on the pump cover, in particular in the region of the pump chamber, are avoided. According to the invention, it is provided that the cut edges (12) are arched towards their indentation (10).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Förderaggregat nach der Gattung des Hauptanspruchs.The invention relates to a delivery unit according to the preamble of the main claim.

Es ist schon ein Förderaggregat aus der DE 195 28 181 A1 bekannt, mit einem zylinderförmigen, eine Pumpenachse aufweisenden Pumpengehäuse und einem das Pumpengehäuse stirnseitig verschließenden Pumpendeckel. Der Pumpendeckel ist durch lokale Verformung des Pumpengehäuses im Pumpengehäuse fixiert, wobei die lokale Verformung des Pumpengehäuses durch mehrere über den Umfang des Pumpengehäuses verteilte lokale Einbuchtungen erreicht ist, die eine Schulter des Pumpendeckels hintergreifen und bei denen das Pumpengehäuse jeweils an einer geradlinigen Schnittkante lokal durchtrennt ist. Der Pumpendeckel wird durch die lokalen Einbuchtungen im Pumpengehäuse in axialer Richtung gegen ein im Pumpengehäuse angeordnetes, ein Laufrad des Förderaggregates umfassendes Zwischengehäuse gedrückt. Auf diese Weise ist eine zwischen dem Pumpendeckel und dem Zwischengehäuse gebildete Pumpenkammer abgedichtet. Nachteilig ist, dass durch die lokalen Verformungen des Pumpengehäuses abhängig von dem die Verformungen erzeugenden Werkzeug auch Verformungen auf der der Pumpenkammer zugewandten Seite des Pumpendeckels entstehen können, die den Spielraum für das in der Pumpenkammer angeordnete Laufrad beeinträchtigen können.It is already a delivery unit from the DE 195 28 181 A1 known, with a cylindrical, a pump axis having pump housing and the pump housing frontally occlusive pump cover. The pump cover is fixed by local deformation of the pump housing in the pump housing, wherein the local deformation of the pump housing is achieved by a plurality of distributed over the circumference of the pump housing local indentations, which engage behind a shoulder of the pump cover and in which the pump housing is severed locally at a straight cutting edge , The pump cover is pressed by the local indentations in the pump housing in the axial direction against an arranged in the pump housing, an impeller of the delivery aggregate comprehensive intermediate housing. In this way, a pump chamber formed between the pump cover and the intermediate housing is sealed. The disadvantage is that, as a result of the local deformations of the pump housing, deformations may also occur on the side of the pump cover facing the pump chamber, depending on the tool generating the deformations, which may affect the clearance for the impeller arranged in the pump chamber.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Förderaggregat mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass Verformungen am Pumpendeckel, insbesondere im Bereich der Pumpenkammer, vermieden werden, indem die Schnittkanten jeweils zu Ihrer Einbuchtung hin gewölbt sind.The delivery unit according to the invention with the characterizing features of the main claim has the advantage that deformations on the pump cover, in particular in the pump chamber, are avoided by the cut edges are each arched to your indentation.

Die Verformung des Pumpengehäuses wird durch radial bezüglich der Pumpenachse in das Pumpengehäuse eintauchende Werkzeuge erreicht, deren Unterseite bogenförmig nach innen gewölbt.The deformation of the pump housing is achieved by radially with respect to the pump axis dipping into the pump housing tools, the underside curved arched inwards.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Förderaggregates möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim conveying unit are possible.

Weiterhin vorteilhaft ist, dass sich die Einbuchtungen in radialer Richtung bezüglich der Pumpenachse verjüngen. Das die Einbuchtungen erzeugende Werkzeug ist entsprechend mit einer sich verjüngenden Werkzeugspitze ausgebildet.It is also advantageous that the recesses taper in the radial direction with respect to the pump axis. The indentation generating tool is correspondingly formed with a tapered tool tip.

Nach einem vorteilhaften Ausführungsbeispiel sind die Einbuchtungen in Richtung der Pumpenachse gesehen spitzenförmig, dreieckförmig oder halbkreisförmig. Nach dem vorteilhaften Ausführungsbeispiel ergeben sich räumlich gesehen tetraederförmige Einbuchtungen.According to an advantageous embodiment, the indentations in the direction of the pump axis are pointed, triangular or semicircular. According to the advantageous embodiment, spatially seen result tetrahedral indentations.

Außerdem vorteilhaft ist, wenn die Einbuchtungen im Bereich einer Bördelung des Pumpengehäuses vorgesehen sind. Durch die Bördelung wird erreicht, dass eine Vorspannkraft zwischen Pumpendeckel und einem Zwischengehäuse aufgebaut wird. Gleichzeitig erfolgt eine Zentrierung des Pumpendeckels. Durch Einbuchtungen im Pumpengehäuse wird diese Vorspannkraft weiterhin verstärkt. Die Einbuchtungen dienen auch dazu, diese Vorspannkraft bei allen Betriebstemperaturen und während der gesamten Produktlebensdauer aufrechtzuhalten.It is also advantageous if the indentations are provided in the region of a flange of the pump housing. The curling ensures that a prestressing force is built up between the pump cover and an intermediate housing. At the same time, the pump cover is centered. By indentations in the pump housing, this biasing force is further enhanced. The indentations also serve to maintain this preload force at all operating temperatures and throughout the product life.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert.

Fig.1
zeigt eine dreidimensionale Teilansicht eines Förderaggregates mit erfindungsgemäßen Einbuchtungen zur Befestigung eines Pumpendeckels,
Fig.2
zeigt eine Schnittansicht des Förderaggregates nach Fig.1 mit einer erfindungsgemäßen Einbuchtung und
Fig.3
drei Ansichten eines Werkzeugs zur Herstellung der erfindungsgemäßen Einbuchtungen.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.
Fig.1
shows a three-dimensional partial view of a delivery unit with indentations according to the invention for attaching a pump cover,
Fig.2
shows a sectional view of the delivery unit after Fig.1 with a recess according to the invention and
Figure 3
three views of a tool for producing the indentations according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Fig.1 zeigt eine dreidimensionale Teilansicht eines Förderaggregates mit erfindungsgemäßen Einbuchtungen zur Befestigung eines Pumpendeckels. Fig.1 shows a three-dimensional partial view of a delivery unit with indentations according to the invention for attachment of a pump cover.

Das Förderaggregat dient dazu, ein Fluid zu fördern. Beispielsweise ist das Förderaggregat als Elektrokraftstoffpumpe ausgebildet.The delivery unit serves to convey a fluid. For example, the delivery unit is designed as an electric fuel pump.

Das Förderaggregat umfasst ein zylinderförmiges oder topfförmiges Pumpengehäuse 1 mit einer stirnseitigen Öffnung 2, in der ein die Öffnung 2 verschließender Pumpendeckel 4 angeordnet ist. Der Pumpendeckel 4 ist innerhalb des Pumpengehäuses 1 in axialer Richtung bezüglich einer Pumpenachse 7 des Förderaggregates fixiert und befestigt. Dies wird durch Bördeln, also Umbiegen des Randes der Öffnung 2 und durch mehrere, über den Umfang des Pumpengehäuses 1 verteilte lokale Einbuchtungen 10 am Pumpengehäuse 1 erreicht, die durch lokale Verformung des Pumpengehäuses 1 mittels entsprechender Werkzeuge 8 hergestellt sind. Zur Herstellung einer der Einbuchtungen 10 wird ein Werkzeug 8 nach Fig.3 an der entsprechenden Position in radialer Richtung bezüglich der Pumpenachse 7 in das Material des Pumpengehäuses 1 hineingedrückt und dringt dabei mit einer vorbestimmten Tiefe in das Material ein und verformt dieses plastisch. Dabei wird das Pumpengehäuse 1 an den Einbuchtungen 10 jeweils an einer Schnittkante 12 lokal durchtrennt. Die Einbuchtungen 10 liegen im Bereich der Bördelung 9 des Pumpengehäuses 1.The delivery unit comprises a cylindrical or pot-shaped pump housing 1 with an end opening 2, in which a pump cover 4 occluding the opening 2 is arranged. The pump cover 4 is fixed and secured within the pump housing 1 in the axial direction with respect to a pump axis 7 of the delivery unit. This is achieved by crimping, ie bending over the edge of the opening 2 and through a plurality of local indentations 10 on the pump housing 1 distributed over the circumference of the pump housing 1, which are produced by local deformation of the pump housing 1 by means of corresponding tools 8. To produce one of the recesses 10, a tool 8 is after Figure 3 pressed into the material of the pump housing 1 at the corresponding position in the radial direction with respect to the pump axis 7 and penetrates with a predetermined depth into the material and deforms this plastically. In this case, the pump housing 1 is locally severed at the indentations 10 each at a cutting edge 12. The indentations 10 are in the region of the flange 9 of the pump housing. 1

Fig.2 zeigt eine Schnittansicht des Förderaggregates nach Fig.1 mit einer erfindungsgemäßen Einbuchtung. Fig.2 shows a sectional view of the delivery unit after Fig.1 with a recess according to the invention.

In der Öffnung 2 des Pumpengehäuses 1 sind ein Zwischengehäuse 3 und der die Öffnung 2 verschließende Pumpendeckel 4 angeordnet. Zwischen dem Pumpendeckel 4 und dem Zwischengehäuse 3 ist eine Pumpenkammer 5 eingeschlossen, in der ein Laufrad 6 zur Fluidförderung drehbar gelagert ist.In the opening 2 of the pump housing 1, an intermediate housing 3 and the opening 2 closing the pump cover 4 are arranged. Between the pump cover 4 and the intermediate housing 3, a pump chamber 5 is enclosed, in which an impeller 6 is rotatably mounted for fluid delivery.

Die Einbuchtungen 10 hintergreifen eine Schulter 11 des Pumpendeckels 4 und weisen jeweils eine sich verjüngende, der Schulter 11 des Pumpendeckels 4 zugewandte Grundfläche auf. Die Einbuchtungen 10 sind beispielsweise tetraederförmig ausgebildet, wobei die der Schulter 11 des Pumpendeckels 4 zugewandte dreieckige Fläche des hohlen Tetraeders die Grundfläche ist. Alternativ kann die Grundfläche auch spitzenförmig, halbkreisförmig oder halbovalförmig ausgeführt sein.The recesses 10 engage behind a shoulder 11 of the pump cover 4 and each have a tapered, the shoulder 11 of the pump cover 4 facing base. The recesses 10 are formed, for example tetrahedral, wherein the shoulder 11 of the pump cover 4 facing triangular Area of the hollow tetrahedron is the base area. Alternatively, the base can also be pointed, semi-circular or semi-oval.

Der Pumpendeckel 4 wird von den Einbuchtungen 10 des Pumpengehäuses 1 in axialer Richtung bezüglich der Pumpenachse 7 gegen das Zwischengehäuse 3 gedrückt, wobei das Zwischengehäuse 3 am Pumpengehäuse 1 abgestützt ist, beispielsweise an einem Absatz 15 des Pumpengehäuses 1. Auf diese Weise ist die zwischen dem Pumpendeckel 4 und dem Zwischengehäuse 3 gebildete Pumpenkammer 5 abgedichtet.The pump cover 4 is pressed by the indentations 10 of the pump housing 1 in the axial direction with respect to the pump axis 7 against the intermediate housing 3, wherein the intermediate housing 3 is supported on the pump housing 1, for example on a shoulder 15 of the pump housing 1. In this way, the between the Pump cover 4 and the intermediate housing 3 formed pump chamber 5 sealed.

Die Schulter 11 des Pumpendeckels 4 weist an der der Pumpenkammer 5 abgewandten Seite beispielsweise eine Schräge 13 auf, um eine bestimmte, auf den Pumpendeckel 4 wirkende Vorspannkraft sicher zu stellen.The shoulder 11 of the pump cover 4 has, for example, a bevel 13 on the side facing away from the pump chamber 5 in order to ensure a certain prestressing force acting on the pump cover 4.

Erfindungsgemäß ist vorgesehen, dass die Schnittkanten 12 jeweils zu Ihrer Einbuchtung 10 hin gewölbt sind. Auf diese Weise wird die Überdeckung zwischen dem Pumpengehäuse 1 und dem Pumpendeckel 4 verringert, so dass die mechanischen Belastungen auf den Pumpendeckel 4 und damit auch seine Verformung reduziert werden.According to the invention, it is provided that the cut edges 12 are arched in each case towards their indentation 10. In this way, the overlap between the pump housing 1 and the pump cover 4 is reduced, so that the mechanical loads on the pump cover 4 and thus also its deformation can be reduced.

Fig.3 zeigt drei Ansichten des Werkzeugs zur Herstellung der erfindungsgemäßen Einbuchtungen nach Fig.1 und Fig.2.
Das Werkzeug 8 hat eine Längserstreckung und an seinem freien Ende eine Kuppe 16, die in das Pumpengehäuse 1 gedrückt wird. Die Kuppe 16 ist spitz oder abgerundet ausgeführt. An seiner der Schulter 11 des Pumpendeckels 4 zugewandten Unterseite 17 ist das Werkzeug 8 nach innen gewölbt. Außerdem hat die Kuppe 16 an der Unterseite 17 an ihrem vordersten Ende eine Abflachung oder Anschrägung 18. Die Höhe H des Werkzeuges 8 nimmt dadurch von der vordersten Spitze 19 in Richtung des anderen Endes zu, bis eine konstante Höhe H erreicht ist. Die nach innen gewandte Wölbung des Werkzeuges 8 an seiner Unterseite 17 erzeugt eine korrespondierende nach außen gewandte Wölbung an der Schnittkante 12 der jeweiligen Einbuchtung 10.
Figure 3 shows three views of the tool for producing the indentations according to the invention Fig.1 and Fig.2 ,
The tool 8 has a longitudinal extension and at its free end a dome 16, which is pressed into the pump housing 1. The dome 16 is executed pointed or rounded. At its the shoulder 11 of the pump cover 4 facing bottom 17, the tool 8 is curved inwards. In addition, the top 16 has at the bottom 17 at its foremost end a flattening or chamfer 18. The height H of the tool 8 thereby increases from the foremost tip 19 in the direction of the other end until a constant height H is reached. The inwardly directed curvature of the tool 8 on its underside 17 generates a corresponding outwardly facing curvature at the cutting edge 12 of the respective indentation 10.

Claims (5)

Förderaggregat mit einem zylinderförmigen, eine Pumpenachse (7) aufweisenden Pumpengehäuse (1) und einem das Pumpengehäuse (1) stirnseitig verschließenden Pumpendeckel (4), der durch lokale Verformung des Pumpengehäuses (1) im Pumpengehäuse (1) fixiert ist, wobei die lokale Verformung des Pumpengehäuses (1) durch mehrere über den Umfang des Pumpengehäuses (1) verteilte lokale Einbuchtungen (10) erreicht ist, die eine Schulter (11) des Pumpendeckels (4) hintergreifen und bei denen das Pumpengehäuse (1) jeweils an einer Schnittkante (12) lokal durchtrennt ist, dadurch gekennzeichnet, dass die Schnittkanten (12) jeweils zu Ihrer Einbuchtung (10) hin gewölbt sind.Delivery unit with a cylindrical pump housing (1) having a pump axis (7) and a pump cover (4) closing the pump housing (1) which is fixed by local deformation of the pump housing (1) in the pump housing (1), the local deformation the pump housing (1) is achieved by a plurality of local recesses (10) distributed over the circumference of the pump housing (1), which engage behind a shoulder (11) of the pump cover (4) and in which the pump housing (1) is in each case connected to a cutting edge (12 ) is locally severed, characterized in that the cut edges (12) in each case to their indentation (10) are curved. Förderaggregat nach Anspruch 1, dadurch gekennzeichnet, dass sich die Einbuchtungen (10) in Richtung zunehmender Eindringtiefe gesehen verjüngen.Delivery unit according to claim 1, characterized in that the indentations (10) taper in the direction of increasing penetration depth seen. Förderaggregat nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Einbuchtungen (10) in Richtung der Pumpenachse (7) gesehen spitzenförmig, dreieckförmig oder halbkreisförmig sind.Delivery unit according to one of the preceding claims, characterized in that the indentations (10) in the direction of the pump axis (7) seen are tip-shaped, triangular or semicircular. Förderaggregat nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Einbuchtungen (10) tetraederförmig sind.Delivery unit according to one of the preceding claims, characterized in that the indentations (10) are tetrahedral. Förderaggregat nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Einbuchtungen (10) im Bereich einer Bördelung (9) des Pumpengehäuses (1) vorgesehen sind.Delivery unit according to one of the preceding claims, characterized in that the indentations (10) in the region of a flange (9) of the pump housing (1) are provided.
EP17159213.2A 2016-05-03 2017-03-03 Fixing of a pump cover by notches formed in a casing wall, said notches engaging a shoulder of the cover Withdrawn EP3242039A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016207595.0A DE102016207595A1 (en) 2016-05-03 2016-05-03 delivery unit

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293288A (en) * 1979-02-05 1981-10-06 Weber Industries, Inc. Submersible pump housing
DE19528181A1 (en) 1995-08-01 1997-02-06 Bosch Gmbh Robert Peripheral pump, in particular for delivering fuel from a storage tank to the internal combustion engine of a motor vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293288A (en) * 1979-02-05 1981-10-06 Weber Industries, Inc. Submersible pump housing
DE19528181A1 (en) 1995-08-01 1997-02-06 Bosch Gmbh Robert Peripheral pump, in particular for delivering fuel from a storage tank to the internal combustion engine of a motor vehicle

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