WO2011039128A2 - Internal gear pump for a hydraulic vehicle braking system - Google Patents

Internal gear pump for a hydraulic vehicle braking system Download PDF

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Publication number
WO2011039128A2
WO2011039128A2 PCT/EP2010/064214 EP2010064214W WO2011039128A2 WO 2011039128 A2 WO2011039128 A2 WO 2011039128A2 EP 2010064214 W EP2010064214 W EP 2010064214W WO 2011039128 A2 WO2011039128 A2 WO 2011039128A2
Authority
WO
WIPO (PCT)
Prior art keywords
internal gear
pump
pressure piece
gear pump
disc
Prior art date
Application number
PCT/EP2010/064214
Other languages
German (de)
French (fr)
Other versions
WO2011039128A3 (en
Inventor
Rene Schepp
Norbert Alaze
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
Priority to US13/498,309 priority Critical patent/US20120244028A1/en
Priority to JP2012531339A priority patent/JP2013506088A/en
Priority to CN2010800441856A priority patent/CN102782326A/en
Priority to EP10759877A priority patent/EP2483562A2/en
Publication of WO2011039128A2 publication Critical patent/WO2011039128A2/en
Publication of WO2011039128A3 publication Critical patent/WO2011039128A3/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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • 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
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the invention relates to an internal gear pump for a hydraulic vehicle brake system having the features of the preamble of claim 1.
  • Such an internal gear pump is known from the published patent application
  • the internal gear pump has an internal gear and an external gear eccentric to and meshing with the internal gear.
  • the internal gear pump has a pressure piece on an end face of the internal gear and the external gear, sealingly against the end faces of the pump
  • the pump space is a space between the two gears that extends circumferentially from a pump inlet to a pump outlet.
  • the pressure piece is usually in the form of a perforated disk and is penetrated by a pump shaft, it is also referred to as an axial disk. It can be arranged on both faces of the gears of an internal gear pump, a pressure piece or there is only one pressure piece available.
  • the pump chamber is closed and sealed on the other end face, for example by a housing wall of a pump housing, the pump housing being closed on this side, for example, or it is a housing wall between two internal gear pumps.
  • the housing wall can possibly be interpreted as a pressure piece.
  • the thrust piece of an internal gear pump must be made of a wear-resistant material, otherwise the gear wheels form in particular in the region of their tooth heads, which leads to leakage, worsens the efficiency of the pump and a delivery pressure, ie a pressure difference between pump penauslass and pump inlet, reduced.
  • a delivery pressure ie a pressure difference between pump penauslass and pump inlet, reduced.
  • the pump inlet and the pump outlet pass through the pressure piece, it has a complicated shape.
  • the pump outlet in some cases also the pump inlet, has a so-called pressure field in the pressure piece.
  • the pressure field is a recess that extends a little bit in the circumferential direction.
  • the preparation of such a pressure piece of a wear-resistant material is complex because of the complicated shape and associated with high costs.
  • the internal gear pump according to the invention with the features of claim 1 has a pressure piece on an end face of the gears, d. H. of the internal gear and the external gear of the internal gear pump. Between the pressure piece and the gears, a disc with high wear resistance is arranged rotationally fixed, which closes and seals the pump chamber on this end face.
  • the disc and / or the pressure piece can extend over the entire circumference or over part of the circumference, the disc extends at least as far in the circumferential direction as the pump space of the internal gear pump. Because the disc rotatably rests on the pressure piece and no pressure component along the pressure piece, the pressure piece of the internal gear pump according to the invention is in principle not wear-exposed.
  • the invention has the advantage that the pressure piece can consist of a cost-effective, easy to process and / or easily produced material, it can be made for example by injection molding of plastic.
  • the arranged between the pressure piece and the gears of the internal gear pump disc can be thin and therefore requires little material.
  • the material costs of the disc can be kept low, even if the disc consists of an expensive material high wear resistance.
  • Another advantage is the easier machinability of the disk when it is thin.
  • FIG. 1 shows an axial section of an internal gear pump according to the invention
  • Figure 2 is an end view of an internal gear pump of Figure 1;
  • FIG. 3 shows a disk of the internal gear pump from FIGS. 1 and 2;
  • Figure 4 is a pressure piece of the internal gear pump of Figures 1 and 2 embodiment of the invention
  • the illustrated in Figure 1 internal gear pump 1 is a double pump with two internal gear pumps 2, 2 '.
  • Each internal gear pump 2, 2 ' has an external gear 3, 3' and an internal gear 4, 4 ', which mesh with each other.
  • the two gears 3, 4, 3 ', 4' are arranged in a plane and eccentric to each other.
  • the external gears 3, 3 ' are rotationally fixed by star profiles 5, 5' by positive engagement with a pump shaft 6.
  • the two internal gear pumps 2, 2 ' are housed in a two-part housing 7, 7', the radially divided and the two housing halves 7, T axially are pinned together. Between the two gear pumps 2, 2 'is a
  • Partition 8 arranged.
  • a pump chamber 10 ( Figure 2) between the external gear 3, 3 'and the internal gear 4, 4', an arcuate sickle 1 1 is arranged, which is pivotable about a pin 12 which passes through the filler 1 1 axially parallel to the pump shaft 6. Tooth tips of the external gear 3, 3 'and the internal gear 4, 4' strip on the sickle 1 1 along.
  • the internal gear pump 2, 2 ' is therefore a so-called sickle pump.
  • the invention is not limited to this type of internal gear pump, it may for example be designed as a gerotor pump (not shown).
  • the pump chamber 10 extends within the nenzahnrads 4, 4 'in the circumferential direction around the external gear 3, 3' from a pump inlet 13 to a pump outlet 14th
  • FIG. 4 shows the front view of one of the plungers 9.
  • the plungers 9 are disc-shaped, they are made of plastic and are made by injection molding. They have the shape of circle segments extending over more than 180 °, i. H. take more than one semicircle.
  • an oblique surface 16 is excluded at the transition from a straight, chordwise edge 17 to the periphery.
  • the pressure pieces 9 have a blind hole 18 for the pin 12 of the sickle 1 1 and a pressure pad 19.
  • the pressure field 19 is a recess in the end face of the pressure piece 9, which faces the internal gear pump 2, 2 'and which extends a little way in the circumferential direction and tapers in a circumferential direction.
  • Pressure fields are known from internal gear pumps, they serve an axial hydraulic compensation at the pump inlet and / or outlet.
  • 2 In the illustrated internal gear pump 2, 2 'communicates the pressure field 19 with the pump outlet 14, at the pump inlet 13, the pressure piece 9, instead of a pressure field, the flattening through the chordwise edge 17.
  • the left in Figure 1 pressure piece 9 on the closed side of the housing 7 additionally has a bearing bush 20 for pivotal mounting of the pump shaft 6.
  • the bushing 20 is an integral part of the pressure piece 9.
  • Figure 1 right pressure piece 9 ' has no bearing bush, because the pump shaft 6 is mounted there with an engine mount, not shown, an electric drive motor of the internal gear pump 1, 2, 2'.
  • a disc 21, 21 ' is arranged, which consists of metal or other wear-resistant material.
  • the disc 21 has the same shape as the pressure piece 9. The disc 21 closes the pump chamber 10 and seals the gears 3, 4, 3 ', 4' at their end faces.

Abstract

The invention relates to an internal gear pump (2, 2') for a slip-regulated hydraulic vehicle braking system, comprising one pressure piece (8, 9, 9') on either side of the gear wheels (3, 4, 3', 4') of said pump. According to the invention, a disk (21, 21') consisting of wear-resistant material is arranged between the pressure piece (8, 9, 9') and the gear pump (2, 2'). The pressure pieces (9, 9') can be manufactured from plastic to reduce costs.

Description

Beschreibung  description
Titel title
Innenzahnradpumpe für eine hydraulische Fahrzeugbremsanlage  Internal gear pump for a hydraulic vehicle brake system
Stand der Technik State of the art
Die Erfindung betrifft eine Innenzahnradpumpe für eine hydraulische Fahrzeugbremsanlage mit den Merkmalen des Oberbegriffs des Anspruchs 1 . Eine derar- tige Innenzahnradpumpe ist bekannt aus der OffenlegungsschriftThe invention relates to an internal gear pump for a hydraulic vehicle brake system having the features of the preamble of claim 1. Such an internal gear pump is known from the published patent application
DE 10 2007 054 808 A1. Die Innenzahnradpumpe hat ein Innenzahnrad und ein Außenzahnrad, das exzentrisch zum Innenzahnrad in diesem angeordnet ist und mit ihm kämmt. Zum Verschließen und zur Abdichtung eines Pumpenraums weist die Innenzahnradpumpe ein Druckstück auf einer Stirnseite des Innen- zahnrads und des Außenzahnrads auf, das dichtend an den Stirnseiten derDE 10 2007 054 808 A1. The internal gear pump has an internal gear and an external gear eccentric to and meshing with the internal gear. For closing and sealing a pump chamber, the internal gear pump has a pressure piece on an end face of the internal gear and the external gear, sealingly against the end faces of the pump
Zahnräder anliegt. Der Pumpenraum ist ein Raum zwischen den beiden Zahnrädern, der sich in Umfangsrichtung von einem Pumpeneinlass zu einem Pum- penauslass erstreckt. Das Druckstück hat üblicherweise die Form einer Lochscheibe und wird von einer Pumpenwelle durchgriffen, es wird auch als Axial- scheibe bezeichnet. Es kann auf beiden Stirnseiten der Zahnräder einer Innenzahnradpumpe ein Druckstück angeordnet sein oder es ist nur ein Druckstück vorhanden. In letzterem Fall ist der Pumpenraum auf der anderen Stirnseite beispielsweise durch eine Gehäusewand eines Pumpengehäuses verschlossen und abgedichtet, wobei das Pumpengehäuse auf dieser Seite beispielsweise ge- schlössen ist, oder es handelt sich um eine Gehäusewand zwischen zwei Innen- zahnradpumpen. Die Gehäusewand kann ggf. als Druckstück aufgefasst werden. Gears rests. The pump space is a space between the two gears that extends circumferentially from a pump inlet to a pump outlet. The pressure piece is usually in the form of a perforated disk and is penetrated by a pump shaft, it is also referred to as an axial disk. It can be arranged on both faces of the gears of an internal gear pump, a pressure piece or there is only one pressure piece available. In the latter case, the pump chamber is closed and sealed on the other end face, for example by a housing wall of a pump housing, the pump housing being closed on this side, for example, or it is a housing wall between two internal gear pumps. The housing wall can possibly be interpreted as a pressure piece.
Das Druckstück einer Innenzahnradpumpe muss aus einem verschleißfesten Material bestehen, weil sich sonst die Zahnräder insbesondere im Bereich ihrer Zahnköpfe einformen, was zu Undichtigkeit führt, den Wirkungsgrad der Pumpe verschlechtert und einen Förderdruck, also eine Druckdifferenz zwischen Pum- penauslass und Pumpeneinlass, verringert. Weil der Pumpeneinlass und der Pumpenauslass durch das Druckstück führt, weist es eine komplizierte Form auf. Vielfach weist der Pumpenauslass, teilweise auch der Pumpeneinlass, ein sog. Druckfeld im Druckstück auf. Beim Druckfeld handelt es sich um eine Aus- nehmung, die sich ein Stück weit in Umfangsrichtung erstreckt. Die Herstellung eines solchen Druckstücks aus einem verschleißfesten Werkstoff ist wegen der komplizierten Form aufwändig und mit hohen Kosten verbunden. The thrust piece of an internal gear pump must be made of a wear-resistant material, otherwise the gear wheels form in particular in the region of their tooth heads, which leads to leakage, worsens the efficiency of the pump and a delivery pressure, ie a pressure difference between pump penauslass and pump inlet, reduced. Because the pump inlet and the pump outlet pass through the pressure piece, it has a complicated shape. In many cases, the pump outlet, in some cases also the pump inlet, has a so-called pressure field in the pressure piece. The pressure field is a recess that extends a little bit in the circumferential direction. The preparation of such a pressure piece of a wear-resistant material is complex because of the complicated shape and associated with high costs.
Offenbarung der Erfindung Disclosure of the invention
Die erfindungsgemäße Innenzahnradpumpe mit den Merkmalen des Anspruchs 1 weist ein Druckstück auf einer Stirnseite der Zahnräder, d. h. des Innenzahnrads und des Außenzahnrads der Innenzahnradpumpe auf. Zwischen dem Druckstück und den Zahnrädern ist eine Scheibe mit hoher Verschleißfestigkeit drehfest angeordnet, die den Pumpenraum auf dieser Stirnseite verschließt und abdichtet. Die Scheibe und/oder das Druckstück können sich über den gesamten Umfang oder über einen Teil des Umfangs erstrecken, die Scheibe erstreckt sich mindestens so weit in Umfangsrichtung wie der Pumpenraum der Innenzahnradpumpe. Weil die Scheibe drehfest am Druckstück anliegt und am Druckstück kein Bauteil entlang gleitet, ist das Druckstück der erfindungsgemäßen Innenzahnradpumpe grundsätzlich nicht verschleißbeaufschlagt. Die Erfindung hat den Vorteil, dass das Druckstück aus einem kostengünstigen, gut bearbeitbaren und/oder einfach herstellbaren Werkstoff bestehen kann, es kann beispielsweise durch Spritzgießen aus Kunststoff hergestellt sein. Die zwischen dem Druckstück und den Zahnrädern der Innenzahnradpumpe angeordnete Scheibe kann dünn sein und erfordert deswegen wenig Werkstoff. Die Werkstoffkosten der Scheibe lassen sich dadurch niedrig halten, auch wenn die Scheibe aus einem teuren Werkstoff hoher Verschleißfestigkeit besteht. Ein weiterer Vorteil ist die einfachere Bearbeitbarkeit der Scheibe, wenn sie dünn ist. The internal gear pump according to the invention with the features of claim 1 has a pressure piece on an end face of the gears, d. H. of the internal gear and the external gear of the internal gear pump. Between the pressure piece and the gears, a disc with high wear resistance is arranged rotationally fixed, which closes and seals the pump chamber on this end face. The disc and / or the pressure piece can extend over the entire circumference or over part of the circumference, the disc extends at least as far in the circumferential direction as the pump space of the internal gear pump. Because the disc rotatably rests on the pressure piece and no pressure component along the pressure piece, the pressure piece of the internal gear pump according to the invention is in principle not wear-exposed. The invention has the advantage that the pressure piece can consist of a cost-effective, easy to process and / or easily produced material, it can be made for example by injection molding of plastic. The arranged between the pressure piece and the gears of the internal gear pump disc can be thin and therefore requires little material. The material costs of the disc can be kept low, even if the disc consists of an expensive material high wear resistance. Another advantage is the easier machinability of the disk when it is thin.
Die Unteransprüche haben vorteilhafte Ausgestaltungen und Weiterbildungen der im Anspruch 1 angegebenen Erfindung zum Gegenstand. Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer Ausführungsform, der Zeichnung und den Ansprüchen. Die einzelnen Merkmale können je für sich oder zu mehreren in beliebiger Kombination bei Ausführungsformen der Erfindung verwirklicht sein. Kurze Beschreibung der Zeichnung The dependent claims have advantageous refinements and developments of the invention specified in claim 1 to the subject. Further features of the invention will become apparent from the following description of an embodiment, the drawings and the claims. The individual features may be implemented individually or in any combination in embodiments of the invention. Short description of the drawing
Die Erfindung wird nachfolgend anhand einer in der Zeichnung dargestellten Ausführungsform näher erläutert. Es zeigen: The invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it:
Figur 1 einen Achsschnitt einer erfindungsgemäßen Innenzahnradpumpe; 1 shows an axial section of an internal gear pump according to the invention;
Figur 2 eine Stirnansicht einer Innenzahnradpumpe aus Figur 1 ; Figure 2 is an end view of an internal gear pump of Figure 1;
Figur 3 eine Scheibe der Innenzahnradpumpe aus Figuren 1 und 2; und FIG. 3 shows a disk of the internal gear pump from FIGS. 1 and 2; and
Figur 4 ein Druckstück der Innenzahnradpumpe aus Figuren 1 und 2. Ausführungsform der Erfindung Figure 4 is a pressure piece of the internal gear pump of Figures 1 and 2 embodiment of the invention
Die in Figur 1 dargestellte Innenzahnradpumpe 1 gemäß der Erfindung ist eine Doppelpumpe mit zwei Innenzahnradpumpen 2, 2'. Jede Innenzahnradpumpe 2, 2' weist ein Außenzahnrad 3, 3' und ein Innenzahnrad 4, 4' auf, die miteinander kämmen. Die beiden Zahnräder 3, 4, 3', 4' sind in einer Ebene und exzentrisch zueinander angeordnet. Die Außenzahnräder 3, 3' sind durch Sternprofile 5, 5' durch Formschluss drehfest mit einer Pumpenwelle 6. Die beiden Innenzahnradpumpen 2, 2' sind in einem zweiteiligen Gehäuse 7, 7' untergebracht, das radial geteilt und dessen beide Gehäusehälften 7, T axial zu- sammengesteckt sind. Zwischen den beiden Zahnradpumpen 2, 2' ist eineThe illustrated in Figure 1 internal gear pump 1 according to the invention is a double pump with two internal gear pumps 2, 2 '. Each internal gear pump 2, 2 'has an external gear 3, 3' and an internal gear 4, 4 ', which mesh with each other. The two gears 3, 4, 3 ', 4' are arranged in a plane and eccentric to each other. The external gears 3, 3 'are rotationally fixed by star profiles 5, 5' by positive engagement with a pump shaft 6. The two internal gear pumps 2, 2 'are housed in a two-part housing 7, 7', the radially divided and the two housing halves 7, T axially are pinned together. Between the two gear pumps 2, 2 'is a
Trennwand 8 angeordnet. Partition 8 arranged.
In einem Pumpenraum 10 (Figur 2) zwischen dem Außenzahnrad 3, 3' und dem Innenzahnrad 4, 4' ist eine bogenförmige Sichel 1 1 angeordnet, die um einen Stift 12 schwenkbar ist, der das Füllstück 1 1 achsparallel zur Pumpenwelle 6 durchsetzt. Zahnköpfe des Außenzahnrads 3, 3' und des Innenzahnrads 4, 4' streifen an der Sichel 1 1 entlang. Die Innenzahnradpumpe 2, 2' ist also eine sog. Sichelpumpe. Die Erfindung ist nicht auf diese Bauform von Innenzahnradpumpen beschränkt, sie kann beispielsweise auch als Zahnringpumpe ausge- führt sein (nicht dargestellt). Der Pumpenraum 10 erstreckt sich innerhalb des In- nenzahnrads 4, 4' in Umfangsrichtung um das Außenzahnrad 3, 3' herum von einem Pumpeneinlass 13 zu einem Pumpenauslass 14. In a pump chamber 10 (Figure 2) between the external gear 3, 3 'and the internal gear 4, 4', an arcuate sickle 1 1 is arranged, which is pivotable about a pin 12 which passes through the filler 1 1 axially parallel to the pump shaft 6. Tooth tips of the external gear 3, 3 'and the internal gear 4, 4' strip on the sickle 1 1 along. The internal gear pump 2, 2 'is therefore a so-called sickle pump. The invention is not limited to this type of internal gear pump, it may for example be designed as a gerotor pump (not shown). The pump chamber 10 extends within the nenzahnrads 4, 4 'in the circumferential direction around the external gear 3, 3' from a pump inlet 13 to a pump outlet 14th
Auf einander abgewandten Stirnseiten der Innenzahnradpumpen 2, 2' sind Druckstücke 9, 9' angeordnet, die zylindrische Durchgangslöcher 15 für dieOn opposite end faces of the internal gear pumps 2, 2 'are plungers 9, 9' are arranged, the cylindrical through holes 15 for the
Pumpenwelle 6 aufweisen. Figur 4 zeigt die Stirnansicht eines der Druckstücke 9. Die Druckstücke 9 sind scheibenförmig, sie bestehen aus Kunststoff und sind durch Spritzgießen hergestellt. Sie haben die Form von Kreissegmenten, die sich über mehr als 180° erstrecken, d. h. mehr als einen Halbkreis einnehmen. Zu- sätzlich ist eine Schrägfläche 16 am Übergang von einem geraden, in Sehnenrichtung verlaufenden Rand 17 zum Umfang ausgenommen. Die Druckstücke 9 weisen ein Sackloch 18 für den Stift 12 der Sichel 1 1 sowie ein Druckfeld 19 auf. Das Druckfeld 19 ist eine Aussparung in der Stirnseite des Druckstücks 9, die der Innenzahnradpumpe 2, 2' zugewandt ist und die sich ein Stück weit in Um- fangsrichtung erstreckt und sich in einer Umfangsrichtung verjüngt. SolchePump shaft 6 have. Figure 4 shows the front view of one of the plungers 9. The plungers 9 are disc-shaped, they are made of plastic and are made by injection molding. They have the shape of circle segments extending over more than 180 °, i. H. take more than one semicircle. In addition, an oblique surface 16 is excluded at the transition from a straight, chordwise edge 17 to the periphery. The pressure pieces 9 have a blind hole 18 for the pin 12 of the sickle 1 1 and a pressure pad 19. The pressure field 19 is a recess in the end face of the pressure piece 9, which faces the internal gear pump 2, 2 'and which extends a little way in the circumferential direction and tapers in a circumferential direction. Such
Druckfelder sind von Innenzahnradpumpen bekannt, sie dienen einem axialen hydraulischen Ausgleich am Pumpenein- und/oder -auslass. Bei der dargestellten Innenzahnradpumpe 2, 2' kommuniziert das Druckfeld 19 mit dem Pumpenauslass 14, am Pumpeneinlass 13 weist das Druckstück 9 statt eines Druckfeldes die Abflachung durch den in Sehnenrichtung verlaufenden Rand 17 auf. Pressure fields are known from internal gear pumps, they serve an axial hydraulic compensation at the pump inlet and / or outlet. In the illustrated internal gear pump 2, 2 'communicates the pressure field 19 with the pump outlet 14, at the pump inlet 13, the pressure piece 9, instead of a pressure field, the flattening through the chordwise edge 17.
Das in Figur 1 linke Druckstück 9 auf der geschlossenen Seite des Gehäuses 7 weist zusätzlich eine Lagerbuchse 20 zur Drehlagerung der Pumpenwelle 6 auf. Die Lagerbuchse 20 ist ein einstückiger Bestandteil des Druckstücks 9. Das inThe left in Figure 1 pressure piece 9 on the closed side of the housing 7 additionally has a bearing bush 20 for pivotal mounting of the pump shaft 6. The bushing 20 is an integral part of the pressure piece 9. The in
Figur 1 rechte Druckstück 9' weist keine Lagerbuchse auf, weil die Pumpenwelle 6 dort mit einem nicht dargestellten Motorlager eines Elektro-Antriebsmotors der Innenzahnradpumpe 1 , 2, 2' gelagert ist. Zwischen dem Druckstück 9, 9' und den Zahnrädern 3, 4, 3', 4' der Innenzahnradpumpen 2, 2' ist eine Scheibe 21 , 21 ' angeordnet, die aus Metall oder einem sonstigen verschleißfesten Werkstoff besteht. In Stirnansicht (Figur 3) hat die Scheibe 21 dieselbe Form wie das Druckstück 9. Die Scheibe 21 verschließt den Pumpenraum 10 und dichtet die Zahnräder 3, 4, 3', 4' an ihren Stirnseiten ab. Die Scheiben 21 , 21 ' sind von der Pumpenwelle 6 und den Stiften 12, 12' derFigure 1 right pressure piece 9 'has no bearing bush, because the pump shaft 6 is mounted there with an engine mount, not shown, an electric drive motor of the internal gear pump 1, 2, 2'. Between the pressure piece 9, 9 'and the gears 3, 4, 3', 4 'of the internal gear pumps 2, 2', a disc 21, 21 'is arranged, which consists of metal or other wear-resistant material. In front view (Figure 3), the disc 21 has the same shape as the pressure piece 9. The disc 21 closes the pump chamber 10 and seals the gears 3, 4, 3 ', 4' at their end faces. The discs 21, 21 'are of the pump shaft 6 and the pins 12, 12' of
Sicheln 1 1 , 1 1 ' durchsetzt und dadurch drehfest gehalten. Da die Scheiben 21 , 21 ' dünn sind, lassen sie sich gut bearbeiten, obwohl sie aus verschleißfestem Werkstoff bestehen. Sie weisen ausschließlich zylindrische und deswegen einfach herstellbare Löcher auf. In der Stirnfläche, die der Innenzahnradpumpe 2, 2' zugewandt ist, weisen die Scheiben 21 , 21 ' Feinsteuerkerben 22 auf. Dabei han- delt es sich um Rillen, die sich bogenförmig ein begrenztes Stück in einer mittleren Zahnhöhe der Zahnräder 3, 4, 3', 4' erstrecken. Die Feinsteuerkerben 22 sorgen für einen Druckausgleich in Zahnzwischenräumen der Zahnräder 3, 4, 3', 4' und mindern eine Geräuschentwicklung der Innenzahnradpumpen 2, 2'. Die beiden Innenzahnradpumpen 2, 2' sind um 180° zueinander versetzt, d. h. ihre Pumpenräume 10 liegen in Umfangsrichtung gesehen einander gegenüber. Sickles 1 1, 1 1 'interspersed and held by rotation. Since the discs 21, 21 'are thin, they can be processed well, although they are made of wear-resistant material. They have only cylindrical and therefore easy to produce holes. In the end face which faces the internal gear pump 2, 2 ', the disks 21, 21' have fine control notches 22. These are grooves which extend arcuately a limited distance in a central tooth height of the gears 3, 4, 3 ', 4'. The fine control notches 22 provide pressure equalization in interdental spaces of the gears 3, 4, 3 ', 4' and reduce noise of the internal gear pumps 2, 2 '. The two internal gear pumps 2, 2 'are offset by 180 ° to each other, ie their pump chambers 10 are seen in the circumferential direction opposite each other.
Auf den einander zugewandten Stirnseiten der Innenzahnradpumpen 2, 2', also zwischen den Innenzahnradpumpen 2, 2' und der Trennwand 8, sind ebenfalls Scheiben 21 , 21 ' angeordnet, wie sie auch zwischen den Druckstücken 9, 9' und den Innenzahnradpumpen 2, 2' angeordnet und oben erläutert worden sind. Die Trennwand 8 kann ebenfalls als Druckstück der Innenzahnradpumpen 2, 2' auf- gefasst werden. Die Pumpeneinlässe 10 und die Pumpenauslässe 14 sind durch die TrennwandOn the mutually facing end faces of the internal gear pumps 2, 2 ', ie between the internal gear pumps 2, 2' and the partition wall 8, discs 21, 21 'are also arranged, as they are also between the pressure pieces 9, 9' and the internal gear 2, 2 'have been arranged and explained above. The partition wall 8 can also be taken as a pressure piece of the internal gear pumps 2, 2 '. The pump inlets 10 and the pump outlets 14 are through the bulkhead
8 geführt, sie befinden sich außerhalb der Schnittebene und sind deswegen nicht sichtbar. 8 guided, they are outside the cutting plane and are therefore not visible.

Claims

Ansprüche claims
1 . Innenzahnradpumpe für eine hydraulische Fahrzeugbremsanlage, mit einem Innenzahnrad (4, 4') und mit einem exzentrisch in ihm angeordneten Außenzahnrad (3, 3'), das mit dem Innenzahnrad (4, 4') kämmt, und mit einem Druckstück (8, 9, 9'), das drehfest auf einer Stirnseite des Außenzahnrads (3, 3') und des Innenzahnrads (4, 4') angeordnet ist, dadurch gekennzeichnet, dass zwischen dem Druckstück (8, 9, 9') einerseits und dem Außenzahnrad (3, 3') und dem Innenzahnrad (4, 4') andererseits eine Scheibe (21 , 21 ') hoher Verschleißfestigkeit drehfest angeordnet ist, die die Zahnräder (3, 4, 3', 4') auf der Stirnseite abdichtet. 1 . Internal gear pump for a hydraulic vehicle brake system, with an internal gear (4, 4 ') and with an eccentrically arranged in it external gear (3, 3'), which meshes with the internal gear (4, 4 '), and with a pressure piece (8, 9 , 9 '), which is non-rotatably mounted on an end face of the external gear (3, 3') and the internal gear (4, 4 '), characterized in that between the pressure piece (8, 9, 9') on the one hand and the external gear ( 3, 3 ') and the internal gear (4, 4') on the other hand, a disc (21, 21 ') of high wear resistance is rotatably disposed, which seals the gears (3, 4, 3', 4 ') on the front side.
2. Innenzahnradpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass die Scheibe (21 , 21 ') aus Metall und/oder das Druckstück (9, 9') aus Kunststoff besteht. 2. Internal gear pump according to claim 1, characterized in that the disc (21, 21 ') made of metal and / or the pressure piece (9, 9') consists of plastic.
3. Innenzahnradpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass die Innenzahnradpumpe (2, 2') auf jeder Stirnseite ihrer Zahnräder (3, 4, 3', 4') ein Druckstück (8, 9, 9') und eine Scheibe (21 , 21 ') aufweist. 3. internal gear pump according to claim 1, characterized in that the internal gear pump (2, 2 ') on each end face of their gears (3, 4, 3', 4 ') a pressure piece (8, 9, 9') and a disc (21 , 21 ').
4. Innenzahnradpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass ein Pumpeneinlass (10) oder ein Pumpenauslass (14) aus dem Druckstück (9, 9') und/oder der Scheibe (21 , 21 ') ausgespart ist. 4. internal gear pump according to claim 1, characterized in that a pump inlet (10) or a pump outlet (14) from the pressure piece (9, 9 ') and / or the disc (21, 21') is recessed.
5. Innenzahnradpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass die Scheibe (21 , 21 ') Rillen (22) auf ihrer den Zahnrädern (3, 4, 3', 4') zugewandten Seite im Bereich von Zähnen der Zahnräder (3, 4, 3', 4') aufweist. 5. internal gear pump according to claim 1, characterized in that the disc (21, 21 ') grooves (22) on its the gears (3, 4, 3', 4 ') facing side in the region of teeth of the gears (3, 4th , 3 ', 4').
6. Innenzahnradpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass das Druckstück (9) ein Wellenlager (20) für eine Pumpenwelle (6) der Innenzahnradpumpe (2, 2') aufweist. 6. internal gear pump according to claim 1, characterized in that the pressure piece (9) has a shaft bearing (20) for a pump shaft (6) of the internal gear pump (2, 2 ').
7. Innenzahnradpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass die Innenzahnradpumpe (1 ) eine Doppelpumpe mit zwei Innenzahnradpumpen (2, 2') ist, die eine gemeinsame Pumpenwelle (6) aufweisen. 7. internal gear pump according to claim 1, characterized in that the internal gear pump (1) is a double pump with two internal gear pumps (2, 2 ') having a common pump shaft (6).
8. Innenzahnradpumpe nach Anspruch 7, dadurch gekennzeichnet, dass die Doppelpumpe zwischen den beiden Innenzahnradpumpen (2, 2') ein gemeinsames Druckstück (8) aufweist. 8. Internal gear pump according to claim 7, characterized in that the double pump between the two internal gear pumps (2, 2 ') has a common pressure piece (8).
PCT/EP2010/064214 2009-10-01 2010-09-27 Internal gear pump for a hydraulic vehicle braking system WO2011039128A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/498,309 US20120244028A1 (en) 2009-10-01 2010-09-27 Internal Gear Pump for a Hydraulic Vehicle Braking System
JP2012531339A JP2013506088A (en) 2009-10-01 2010-09-27 Internal gear pump for hydraulic vehicle brakes
CN2010800441856A CN102782326A (en) 2009-10-01 2010-09-27 Axial sealing element for an internal gear pump
EP10759877A EP2483562A2 (en) 2009-10-01 2010-09-27 Axial sealing for an internal gear pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009045227A DE102009045227A1 (en) 2009-10-01 2009-10-01 Internal gear pump for a hydraulic vehicle brake system
DE102009045227.3 2009-10-01

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WO2011039128A2 true WO2011039128A2 (en) 2011-04-07
WO2011039128A3 WO2011039128A3 (en) 2011-11-10

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EP (1) EP2483562A2 (en)
JP (1) JP2013506088A (en)
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WO (1) WO2011039128A2 (en)

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CN102782326A (en) 2012-11-14
DE102009045227A1 (en) 2011-04-21
JP2013506088A (en) 2013-02-21
US20120244028A1 (en) 2012-09-27
EP2483562A2 (en) 2012-08-08
WO2011039128A3 (en) 2011-11-10

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