WO2004029452A1 - Piston pump - Google Patents

Piston pump Download PDF

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Publication number
WO2004029452A1
WO2004029452A1 PCT/EP2003/010197 EP0310197W WO2004029452A1 WO 2004029452 A1 WO2004029452 A1 WO 2004029452A1 EP 0310197 W EP0310197 W EP 0310197W WO 2004029452 A1 WO2004029452 A1 WO 2004029452A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
piston
stop element
return spring
piston pump
Prior art date
Application number
PCT/EP2003/010197
Other languages
German (de)
French (fr)
Inventor
Uwe Greiff
Christoph KÖHLER
Original Assignee
Continental Teves Ag & Co. Ohg
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 Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Priority to EP03798161A priority Critical patent/EP1549850A1/en
Publication of WO2004029452A1 publication Critical patent/WO2004029452A1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • 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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves

Definitions

  • the invention relates to a piston pump for conveying pressure medium in at least one vehicle brake, a pump piston being movably arranged in a receiving body, a carrier carrying a check valve arranged coaxially to the pump piston for ventilation of a work space into which the pump piston is immersed, and a return spring between Carrier and pump piston is arranged.
  • Such a piston pump is known from EP 0 734 494 AI.
  • the pump piston is part of an independently manageable unit, which includes a check valve for ventilation of the work area and the return spring mentioned. This makes it possible to insert the components mentioned as a unit in a pump bore. In a separate step, the carrier for another check valve is inserted into the extended pump bore, the return spring being elastically pre-tensioned.
  • the above-mentioned structural unit and in particular the resulting assembly process is considered to be capable of improvement.
  • This object is achieved in that the return spring is received and guided in the carrier, and that the carrier forms a cage for the return spring together with an attached stop element.
  • the return spring is not compressed during assembly. This is also protected against buckling in a simple manner.
  • the return spring is not damaged when mounting the carrier in the receiving body.
  • the carrier not only holds the check valve but also houses the return spring, which is provided in a package-like and elastically biased manner, so that there is a saving in components. This is because an indispensable component is created from indispensable components, whereby a separate return spring guide or separate components for spring preloading are omitted. This reduces the number of components.
  • the carrier has a cylindrical connecting piece which surrounds the return spring radially on the outside, so that the return spring is guided on a wall of the connecting piece.
  • the stop element is preferably positively attached to the carrier, for example locked or caulked.
  • the carrier has a fastening section at a distance from an end face on the stop element side, which has at least one radial groove or a recess into which a resiliently biased projection of the stop element engages.
  • the stop element is preferably provided as a one-piece sheet metal molded or pressed sheet metal part, the projection being provided on an essentially cylindrical section of the stop element, which merges into a stop section for the return spring arranged at right angles thereto.
  • the stop element can have recesses for the pressure medium passage.
  • the assembly is facilitated if the carrier has a chamfer in the region of its end face, so that the projection is widened in the radial direction as a result of an axial pressing-on movement, and that the projection snaps into the radial groove or recess formed as an undercut after a further pressing-on movement.
  • the components to be fastened to one another are to a certain extent found when they are assembled.
  • the stop element has a compensating piece which is integrally formed thereon.
  • the compensating piece has one or more spring legs and that each spring leg axially in the direction of a sealing element for the purpose of securing the position has the pump piston, wherein the sealing element can be resiliently applied to the spring legs.
  • the stop element has an essentially S-shaped cross section. Component tolerances are compensated for by the spring action.
  • Figure 1 shows a ⁇ first embodiment of a piston pump in section with caulked stop element.
  • FIG. 2 shows details of a second embodiment with a spacer formed on the stop element
  • Fig. 4 details of a piston pump as in Fig. 3 with a changed direction of action of the check valve.
  • FIG. 1 shows a piston pump 101, the pump piston 102 of which is arranged such that it can move in a pump bore 103 of a receiving body 104, which is part of an electrohydraulic unit provided with an electronic control unit (ECU).
  • ECU electronice control unit
  • a bushing inserted into the pump bore 103 is provided for guiding the pump piston 102.
  • the receiving body 104 further includes unillustrated electromagnetically actuatable valves, and connecting them with each other, not shown, channels, which allow to promote pressure medium for the controlled increase in pressure of a working space 111 in a non-illustrated accumulator or 'not clarified vehicle brakes.
  • vehicle control braking or a control intervention such as, for example, a driving stability control intervention (ESP) or another control intervention, such as, in particular, slip control.
  • ESP driving stability control intervention
  • the pump piston 102 abuts one end indirectly via a roller bearing on a driving eccentric which is set in rotation by a shaft of an electric motor, not shown.
  • a return spring 105 is arranged between a carrier 106 for a check valve 107 (suction valve) and the pump piston 102.
  • a check valve 107 designed as a suction valve serves to ventilate the working space 111.
  • a valve body 108 is pressed permanently into a closed position by a spring 109 for bearing against a sealing seat 110 on the carrier side (left half cut). Only in one suction stroke of the pump piston 102 does the pressure difference applied to the valve body 108 overcome the effective spring forces, so that the valve body 108 moves for ventilation of a working space 111 into the open position shown in the right half-section, as a result of which the pressure medium is introduced into the working space 111.
  • the pressure medium inlet E is blocked and the pressure medium escapes from the working space 111 through through holes 430 arranged radially in the nozzle 116 (FIG. 4) and through a check valve 129 provided in an outlet A, which is drawn in the closed position.
  • the stop element 113 can be provided with axially arranged recesses 131 (FIG. 1).
  • the valve body 108 has a pin 126 which is guided in a bore in a receiving cup 127 and (in FIGS. 1 to 3) projects into the working space 111.
  • the receiving bowl 127 is firmly inserted into the carrier 106.
  • the carrier 106 basically has a cup shape and a base 114 in which the sealing seat 110 is provided for the check valve 107. Stepped through-bores are provided in the base 114 for the pressure medium passage from an inlet E into the work space 111, for receiving the receiving bowl 127 and for forming an annular, work space-side support surface 115 on which the return spring 112 is supported. It goes without saying that the carrier 106 is firmly inserted into the receiving body 104, for example by means of screwing, clinching or caulking (only shown schematically in the figures), which ensures that the return spring forces can act on the pump piston 102 uninhibited.
  • a cup-shaped spring plate 112 is provided to support the return spring 105 at an end of the pump piston 102 which projects into the working space 111 and which rests on the generally cylindrical pump piston 102.
  • the carrier 106 forms, together with a stop element 113 fastened to it separately, a cage for the elastically prestressed reception of the return spring 105. Because when the pump piston 102 is removed, the spring plate 112 lies against the stop element 113 under the action of the spring forces.
  • the return spring 105 is also guided in a cylindrical socket 116 of the carrier 106 by abutment against a radially inner wall 117.
  • the carrier 106 has, on a radially outer wall and at a distance from an end face 118 on the work space side, a fastening section 119 with a radial groove 120, which acts as an undercut, or at least two punctiformly Seen recesses (not shown in the drawing), in each of which a resiliently biased projection 121 of the stop element 113 engages from the radially outside.
  • This design makes it possible to reduce the unused volume (dead volume) present in the work space, which is caused, for example, by components for encapsulating the return spring 105, and yet to realize the assembly advantages of forming an assembly. Overall, this results in an improved pump efficiency with a simplified assembly.
  • the stop element 113, 213 is fastened by circumferential caulking, pressing or rolling of the projection 121, 221.
  • a snap fastening (Fig. 3 and 4) is also possible.
  • the type of fastening is independent of whether the fastening means engage the stop element 113, 213 in a cylindrical circumferential manner (FIGS. 1 and 4), or are provided only at certain points (FIGS. 2 and 3).
  • the fastening section 319.419 advantageously has a chamfer 323.423 which widens the projection 321.421 in the radial direction as a result of an axial pressing-on movement before the projection 321.421 snaps into the radial groove 320.420.
  • the chamfer 323.423 also has a self-centering effect when the components 306, 313; 406.413 are brought together.
  • All of the embodiments (FIGS. 1 to 4) have in common that the projection 121, 221, 321, 421 is provided on an essentially cylindrical section which merges into a flat stop section 122, 222, 322, 422 provided at right angles to the spring plate 112, 212, 1212, 412.
  • FIG. 4 The embodiment according to FIG. 4 is essentially the same as FIG. 1, but a check valve 407 designed as a pressure valve is provided.
  • the valve body 408 is pressed by means of a spring 409 permanently in the direction of the working space 411 onto a sealing seat 410 on the support side, and is brought into the opening position illustrated in the right partial section only under the pressure-relieving overpressure effect. This is achieved simply by exchanging the open position and the closed position by (in comparison with FIG. 1) the reverse arrangement of the valve body 408 with respect to the working space 411.
  • the pin 426 clearly protrudes away from the working space 411.
  • FIG. 1 While a separate, distance-compensating compensating piece 124 in the form of an axially elastic corrugated washer is provided in the embodiment according to FIG. 1, which can be applied to the stop section 122 in such a way that a displacement movement or installation tolerances of a sealing element 125 is limited, the embodiments according to FIGS. 2, 3 and 4 about compensating pieces 224, 324, 424 of possibly different lengths, which are arranged on the stop element 213, 334, 413, and which are designed as freely projecting spring legs, and for the purpose of securing the position of the sealing element 225, 325, 255 axially in its direction point.
  • the sealing element 225, 325, 255 which is carried along by the reciprocating movement of the pump piston 202, 302, 402, can be applied elastically to the spring legs.
  • the system can be installed directly on the sealing element 225, 325, 255, but a flat washer 128, 228, 288, 288, which can be seen in the drawing, is useful for the force distribution and is supported under the action of the spring forces on a step of the pump bore 103, 203, 303, 403.
  • the washer 128,228,328,428 thus serves as an abutment for the sealing element 125,225,325,425.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a piston pump for delivering pressure medium into at least one vehicle brake or into a pressure medium reservoir. According to the invention; a pump piston (102) is displaceably mounted inside an accommodating body (104); a support (106) supports a check valve (107) that is mounted coaxial to the pump piston (102) while being provided for ventilating a working space (111) into which the pump piston (102) enters, and; a return spring (105) is situated between the support (106) and the pump piston (102). The essence of the invention consists of the fact that the return spring (105) is accommodated and guided inside the support (106), and the support (106), together with a stop element (113) fastened therein, forms a cage for the return spring (105). The invention thus provides a subassembly in which the support (106) simultaneously forms a cage for the return spring (105) whereby reducing the dead volume inside the working space (111).

Description

Kolbenpu pePiston pump
Die Erfindung betrifft eine Kolbenpumpe zum Fördern von Druckmittel in wenigstens eine Fahrzeugbremse, wobei ein Pumpenkolben in einem Aufnahmekörper bewegbar angeordnet ist, ein Träger ein koaxial zu dem Pumpenkolben angeordnetes Rückschlagventil zur Ventilation eines Arbeitsraumes trägt, in den der Pumpenkolben eintaucht, und wobei eine Rückstellfeder zwischen Träger und Pumpenkolben angeordnet ist .The invention relates to a piston pump for conveying pressure medium in at least one vehicle brake, a pump piston being movably arranged in a receiving body, a carrier carrying a check valve arranged coaxially to the pump piston for ventilation of a work space into which the pump piston is immersed, and a return spring between Carrier and pump piston is arranged.
Eine derartige Kolbenpumpe ist aus der EP 0 734 494 AI bekannt. Der Pumpenkolben ist Bestandteil einer selbständig handhabbaren Baueinheit, zu der ein Rückschlagventil zur Ventilation des Arbeitsraumes sowie die genannte Rückstellfeder gehört. Dadurch wird es ermöglicht, die genannten Bauteile als Einheit in eine Pumpenbohrung einzuführen. In einem gesonderten Schritt wird der Träger für ein weiteres Rückschlagventil in die verlängerte Pumpenbohrung eingeführt, wobei die Rückstellfeder elastisch vorgespannt wird. Die oben genannte Baueinheit und insbesondere der daraus resultierende Montageprozeß wird als verbesserungsfähig an¬ gesehen .Such a piston pump is known from EP 0 734 494 AI. The pump piston is part of an independently manageable unit, which includes a check valve for ventilation of the work area and the return spring mentioned. This makes it possible to insert the components mentioned as a unit in a pump bore. In a separate step, the carrier for another check valve is inserted into the extended pump bore, the return spring being elastically pre-tensioned. The above-mentioned structural unit and in particular the resulting assembly process is considered to be capable of improvement.
Es ist eine Aufgabe der vorliegenden Erfindung, eine andere, insbesondere einfach montierbare sowie unter geringem Aufwand herstellbare Baueinheit bereitzustellen, welche eine Bauteilreduktion ermöglicht. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Rückstellfeder in dem Träger aufgenommen und geführt ist, und daß der Träger zusammen mit einem daran befestigten Anschlagelement einen Käfig für die Rückstellfeder bildet. Bei der Montage erfolgt keine Kompression der Rückstellfeder. Diese ist ferner auf einfach Art und Weise gegen Ausknicken geschützt. Die Rückstellfeder wird bei der Montage des Trägers in dem Aufnahmekörper nicht beschädigt. Der Träger hält nicht nur das Rückschlagventil sondern beherbergt auch die gewissermaßen paketförmig sowie elastisch vorgespannt vorgesehene Rückstellfeder, so daß sich eine Bauteileinsparung ergibt. Denn es wird aus unerläßlichen Bauteilen eine eigenständig handhabbare Baueinheit geschaffen, wobei eine separate Rückstellfederführung oder gesonderte Bauteile zur Federvorspannung entfallen. Die Zahl der Bauteile wird dadurch reduziert.It is an object of the present invention to provide a different structural unit, in particular one that is easy to assemble and that can be produced with little effort, which enables component reduction. This object is achieved in that the return spring is received and guided in the carrier, and that the carrier forms a cage for the return spring together with an attached stop element. The return spring is not compressed during assembly. This is also protected against buckling in a simple manner. The return spring is not damaged when mounting the carrier in the receiving body. The carrier not only holds the check valve but also houses the return spring, which is provided in a package-like and elastically biased manner, so that there is a saving in components. This is because an indispensable component is created from indispensable components, whereby a separate return spring guide or separate components for spring preloading are omitted. This reduces the number of components.
Gemäß einer vorteilhaften Ausführungsform der Erfindung weist der Träger einen zylindrischen Stutzen auf, welcher die Rückstellfeder radial außen umgreift, so daß die Rückstellfeder an einer Wandung des Stutzen geführt ist. Durch diese Maßnahme kann der radiale Abstand zwischen Rückstellfeder und Wandung ohne Rücksicht auf den Bohrungsdurchmesser der Pumpenbohrung oder betreffend anderer Bauteile be¬ liebig abgeändert und insbesondere auf das erforderliche Maß gebracht werden, wobei eine Außenwandung dieses Stutzen zur Zentrierung des Trägers herangezogen werden kann.According to an advantageous embodiment of the invention, the carrier has a cylindrical connecting piece which surrounds the return spring radially on the outside, so that the return spring is guided on a wall of the connecting piece. By this measure, the radial distance between the return spring and the wall can be used without regard to the bore diameter of the pump bore or on other components wherein an outer wall of this nozzle can be used for centering of the carrier be ¬ arbitrarily modified and brought in particular to the required extent.
Vorzugsweise ist das Anschlagelement formschlüssig an dem Träger befestigt, beispielsweise verrastet oder verstemmt. Zur Vereinfachung der Befestigung des Anschlagelementes weist der Träger im Abstand zu einer anschlagelementseiti- gen Stirnseite einen Befestigungsabschnitt auf, welcher über wenigstens eine Radialnut oder eine Vertiefung verfügt, in die ein federnd vorgespannter Vorsprung des Anschlagelements eingreift.The stop element is preferably positively attached to the carrier, for example locked or caulked. To simplify the fastening of the stop element, the carrier has a fastening section at a distance from an end face on the stop element side, which has at least one radial groove or a recess into which a resiliently biased projection of the stop element engages.
Das Anschlagelement ist zur Kostensenkung vorzugsweise als einstückiges Blechform- oder Blechpressteil vorgesehen, wobei der Vorsprung an einem im wesentlichen zylindrischen Abschnitt des Anschlagelementes vorgesehen ist, welcher in einen rechtwinklig dazu angeordneten Anschlagabschnitt für die Rückstellfeder übergeht. Das Anschlagelement kann über Ausnehmungen für den Druckmitteldurchgang verfügen.To reduce costs, the stop element is preferably provided as a one-piece sheet metal molded or pressed sheet metal part, the projection being provided on an essentially cylindrical section of the stop element, which merges into a stop section for the return spring arranged at right angles thereto. The stop element can have recesses for the pressure medium passage.
Die Montage wird erleichtert, wenn der Träger im Bereich seiner Stirnseite eine Fase aufweist, so daß der Vorsprung infolge einer axialen Aufpressbewegung in Radialrichtung aufgeweitet wird, und daß der Vorsprung nach weiterer Aufpressbewegung in die als Hinterschneidung ausgebildete Radialnut oder Vertiefung einschnappt. Die aneinander zu befestigenden Bauteile finden sich bei deren Montage gewissermaßen selbst.The assembly is facilitated if the carrier has a chamfer in the region of its end face, so that the projection is widened in the radial direction as a result of an axial pressing-on movement, and that the projection snaps into the radial groove or recess formed as an undercut after a further pressing-on movement. The components to be fastened to one another are to a certain extent found when they are assembled.
Eine weitere Reduktion der erforderlichen Bauteile ergibt sich, wenn das Anschlagelement ein einstückig daran ausgebildetes Ausgleichsstück aufweist. Dies wird beispielsweise dadurch gelöst, daß das Ausgleichsstück einen oder mehrere Federschenkel aufweist, und daß jeder Federschenkel zwecks Lagesicherung axial in Richtung eines Dichtelementes für den Pumpenkolben weist, wobei das Dichtelement federnd an den Federschenkeln anlegbar ist. Zu diesem Zweck weist das Anschlagelement einen im wesentlichen S-förmigen Querschnitt auf. Durch die Federwirkung werden Bauteiltoleranzen ausgeglichen.A further reduction in the required components results if the stop element has a compensating piece which is integrally formed thereon. This is achieved, for example, in that the compensating piece has one or more spring legs and that each spring leg axially in the direction of a sealing element for the purpose of securing the position has the pump piston, wherein the sealing element can be resiliently applied to the spring legs. For this purpose, the stop element has an essentially S-shaped cross section. Component tolerances are compensated for by the spring action.
Die Erfindung wird nachstehend anhand der Zeichnung erläutert, welche Ausführungsbeispiele der Erfindung zeigt. Jede der Figuren verdeutlicht jenseits einer Mittelinie zwei Totpunktlagen der Kolbenpumpe in größerem Maßstab wie folgt :The invention is explained below with reference to the drawing, which shows exemplary embodiments of the invention. Each of the figures illustrates two dead center positions of the piston pump on a larger scale beyond a center line as follows:
Fig. 1 eine ^erste Ausführungsform einer Kolbenpumpe im Schnitt mit verstemmtem Anschlagelement;Figure 1 shows a ^ first embodiment of a piston pump in section with caulked stop element.
Fig. 2 Einzelheiten einer zweiten Ausführungsform mit an dem Anschlagelement ausgebildetem Distanzstück;2 shows details of a second embodiment with a spacer formed on the stop element;
Fig. 3 Einzelheiten einer dritten Ausführungsform mit ver- rastetem Anschlagelement, und3 details of a third embodiment with a latched stop element, and
Fig. 4 Einzelheiten einer Kolbenpumpe wie in Fig. 3 mit geänderter Wirkrichtung des Rückschlagventils.Fig. 4 details of a piston pump as in Fig. 3 with a changed direction of action of the check valve.
In der Zeichnung sind einheitlich dreistellige Bezugsziffern vorgesehen, wobei übereinstimmende Merkmale mit grundsätzlich übereinstimmenden Bezugsziffern versehen sind, und die erste Ziffer 1,2,3 oder 4 die Zuordnung zu einem Ausführungsbeispiel der Figuren 1,2,3 oder 4 dokumentiert. Zur Vereinfachung erfolgt die Erläuterung übereinstimmender Merkmale anhand der Fig. 1. Die Fig. 1 zeigt eine Kolbenpumpe 101 deren Pumpenkolben 102 in einer Pumpenbohrung 103 eines Aufnahmekörpers 104 bewegbar geführt angeordnet ist, welcher Bestandteil eines mit einer elektronischen Regeleinheit (ECU) versehenen elektrohydraulischen Aggregates ist. Zur Führung des Pumpenkolbens 102 ist eine, in die Pumpenbohrung 103 eingesetzte Laufbuchse vorgesehen. Der Aufnahmekörper 104 weist ferner nicht dargestellte, elektromagnetisch ansteuerbare Ventile sowie diese miteinander verbindende, nicht gezeigte Kanäle auf, welche es erlauben, Druckmittel zur kontrollierten Druckerhöhung aus einem Arbeitsraum 111 in einen nicht gezeichneten Druckmittelspeicher oder in' nicht verdeutlichte Fahrzeugbremsen zu fördern. Dadurch wird eine Fahrzeugregelbremsung, oder ein Regeleingriff wie beispielsweise ein Fahrstabilitätsregeleingriff (ESP) oder ein anderer Regeleingriff wie insbesondere eine Schlupfregelung ermöglicht .In the drawing, uniform three-digit reference numbers are provided, matching features being provided with fundamentally matching reference numbers, and the first number 1, 2, 3 or 4 documenting the assignment to an exemplary embodiment of FIGS. 1, 2, 3 or 4. For the sake of simplicity, matching features are explained with reference to FIG. 1. 1 shows a piston pump 101, the pump piston 102 of which is arranged such that it can move in a pump bore 103 of a receiving body 104, which is part of an electrohydraulic unit provided with an electronic control unit (ECU). A bushing inserted into the pump bore 103 is provided for guiding the pump piston 102. The receiving body 104 further includes unillustrated electromagnetically actuatable valves, and connecting them with each other, not shown, channels, which allow to promote pressure medium for the controlled increase in pressure of a working space 111 in a non-illustrated accumulator or 'not clarified vehicle brakes. This enables vehicle control braking, or a control intervention such as, for example, a driving stability control intervention (ESP) or another control intervention, such as, in particular, slip control.
Der Pumpenkolben 102 liegt über ein Wälzlager mittelbar mit einem Ende an einem antreibenden Exzenter an, welcher von einer Welle eines nicht dargestellten Elektromotors in Rotation versetzt wird. Eine Rückstellfeder 105 ist zwischen einem Träger 106 für ein Rückschlagventil 107 (Saugventil) und dem Pumpenkolben 102 angeordnet.The pump piston 102 abuts one end indirectly via a roller bearing on a driving eccentric which is set in rotation by a shaft of an electric motor, not shown. A return spring 105 is arranged between a carrier 106 for a check valve 107 (suction valve) and the pump piston 102.
Wie aus der Fig. 1 hervorgeht, dient ein als Saugventil ausgebildetes Rückschlagventil 107 der Ventilation des Arbeitsraumes 111. Zu diesem Zweck wird ein Ventilkörper 108 durch eine Feder 109 permanent in eine Schließstellung zur Anlage an einen trägerseitigen Dichtsitz 110 gepresst (linker Halbschnitt) . Nur in einem Saughub des Pumpenkolben 102 überwindet die an dem Ventilkörper 108 anliegende Druckdifferenz die wirksamen Federkräfte, so daß sich der Ventilkörper 108 zur Ventilation eines Arbeitsraumes 111 in die im rechten Halbschnitt verdeutlichte Öffnungsstellung bewegt, wodurch der Druckmitteleinlaß in den Arbeitsraum 111 erfolgt. Im Verdrängungshub ist der Druckmitteleinlaß E versperrt, und das Druckmittel entweicht aus dem Arbeitsraum 111 durch radial im Stutzen 116 angeordnete Durchgangsbohrungen 430 (Fig. 4) und durch ein in einem Auslaß A vorgesehenes Rückschlagventil 129, welches in Schließstellung gezeichnet ist. Ergänzend - beispielsweise zur Erhöhung des Förderstroms bei Tieftemperaturen oder als Ersatz für die Durchgangsbohrungen 430 kann das Anschlagelement 113 mit axial angeordneten Ausnehmungen 131 (Fig. 1) versehen sein. Zu Führungszwecken verfügt der Ventilkörper 108 über einen Zapfen 126, welcher in einer Bohrung in einem Aufnahmenapf 127 geführt ist, und (bei den Fig. 1 bis 3) in den Arbeitsraum 111 ragt. Der Aufnahmenapf 127 ist fest in den Träger 106 eingesetzt.As can be seen from FIG. 1, a check valve 107 designed as a suction valve serves to ventilate the working space 111. For this purpose, a valve body 108 is pressed permanently into a closed position by a spring 109 for bearing against a sealing seat 110 on the carrier side (left half cut). Only in one suction stroke of the pump piston 102 does the pressure difference applied to the valve body 108 overcome the effective spring forces, so that the valve body 108 moves for ventilation of a working space 111 into the open position shown in the right half-section, as a result of which the pressure medium is introduced into the working space 111. In the displacement stroke, the pressure medium inlet E is blocked and the pressure medium escapes from the working space 111 through through holes 430 arranged radially in the nozzle 116 (FIG. 4) and through a check valve 129 provided in an outlet A, which is drawn in the closed position. In addition - for example to increase the flow rate at low temperatures or as a replacement for the through bores 430, the stop element 113 can be provided with axially arranged recesses 131 (FIG. 1). For guiding purposes, the valve body 108 has a pin 126 which is guided in a bore in a receiving cup 127 and (in FIGS. 1 to 3) projects into the working space 111. The receiving bowl 127 is firmly inserted into the carrier 106.
Wie zu ersehen ist, verfügt der Träger 106 grundsätzlich über Napfform sowie einen Boden 114, in dem der Dichtsitz 110 für das Rückschlagventil 107 vorgesehen ist. In dem Boden 114 sind abgestufte Durchgangsbohrungen zum druckmit- teldurchlaß von einem Einlaß E in den Arbeitsraum 111, zur Aufnahme des Aufnahmenapf 127 sowie zur Bildung einer kreisringförmigen, arbeitsraumseitigen Auflagefläche 115 vorgesehen, auf der die Rückstellfeder 112 abgestützt ist. Es versteht sich, daß der Träger 106 fest in den Aufnahmekörper 104 eingesetzt ist, beispielsweise mittels Ver- schraubung, Verclinchung oder Verstemmung (in den Figuren nur schematisch dargestellt) , wodurch sichergestellt ist, daß die Rückstellfederkräfte ungehemmt auf den Pumpenkolben 102 wirken können.As can be seen, the carrier 106 basically has a cup shape and a base 114 in which the sealing seat 110 is provided for the check valve 107. Stepped through-bores are provided in the base 114 for the pressure medium passage from an inlet E into the work space 111, for receiving the receiving bowl 127 and for forming an annular, work space-side support surface 115 on which the return spring 112 is supported. It goes without saying that the carrier 106 is firmly inserted into the receiving body 104, for example by means of screwing, clinching or caulking (only shown schematically in the figures), which ensures that the return spring forces can act on the pump piston 102 uninhibited.
Nachstehend wird auf unterschiedliche Ausführungsformen eingegangen.Different embodiments are discussed below.
In Fig. 1 ist zur Abstützung der Rückstellfeder 105 an einem in den Arbeitsraum 111 ragenden Ende des Pumpenkolbens 102 ein napfförmiger Federteller 112 vorgesehen, der auf dem generell zylindrisch ausgebildeten Pumpenkolben 102 aufsitzt. Wie zu ersehen ist, bildet der Träger 106 zusammen mit einem separat daran befestigten Anschlagelement 113 einen Käfig zur elastisch vorgespannten Aufnahme der Rückstellfeder 105. Denn wenn der Pumpenkolben 102 entfernt wird, liegt der Federteller 112 unter der Wirkung der Federkräfte an dem Anschlagelement 113 an. Die Rückstellfeder 105 ist ferner in einem zylindrischen Stutzen 116 des Trägers 106 mittels Anlage an einer radial inneren Wandung 117 geführt. Dadurch ist ein Ausknicken der Rückstellfeder 105 - insbesondere im Rahmen eines vor der Endmontage erfolgenden Vorspannvorgangs - ausgeschlossen. Der Vorspannvorgang erfolgt somit bei der Vormontage der Baueinheit (des Trägers 106), indem das Anschlagelement 113, an dem die Rückstellfeder 105 anliegt, formschlüssig an dem Träger 106 befestigt wird. Zu diesem Zweck verfügt der Träger 106 an einer radial äußeren Wandung sowie im Abstand zu einer ar- beitsraumseitigen Stirnseite 118 über einen Befestigungsabschnitt 119 mit einer Radialnut 120, die als Hinterschnei- dung wirksam ist, oder über wenigstens zwei punktuell vor- gesehene Vertiefungen (in der Zeichnung nicht verdeutlicht), in die jeweils ein federnd vorgespannter Vorsprung 121 des Anschlagelementes 113 von radial außen eingreift. Durch diese Bauweise wird es ermöglicht, das im Arbeitsraum vorliegende ungenutzte Volumen (Totvolumen) , welches beispielsweise durch Bauteile zur Kapselung der Rückstellfeder 105 verursacht wird, zu reduzieren und dennoch die Montagevorteile einer Baugruppenbildung zu realisieren. Insgesamt ergibt sich dadurch ein verbesserter Pumpenwirkungsgrad bei vereinfachtem Zusammenbau.In Fig. 1, a cup-shaped spring plate 112 is provided to support the return spring 105 at an end of the pump piston 102 which projects into the working space 111 and which rests on the generally cylindrical pump piston 102. As can be seen, the carrier 106 forms, together with a stop element 113 fastened to it separately, a cage for the elastically prestressed reception of the return spring 105. Because when the pump piston 102 is removed, the spring plate 112 lies against the stop element 113 under the action of the spring forces. The return spring 105 is also guided in a cylindrical socket 116 of the carrier 106 by abutment against a radially inner wall 117. This prevents the return spring 105 from buckling - in particular as part of a pretensioning operation that takes place before final assembly. The pretensioning process thus takes place during the preassembly of the structural unit (the carrier 106) in that the stop element 113, against which the return spring 105 rests, is positively attached to the carrier 106. For this purpose, the carrier 106 has, on a radially outer wall and at a distance from an end face 118 on the work space side, a fastening section 119 with a radial groove 120, which acts as an undercut, or at least two punctiformly Seen recesses (not shown in the drawing), in each of which a resiliently biased projection 121 of the stop element 113 engages from the radially outside. This design makes it possible to reduce the unused volume (dead volume) present in the work space, which is caused, for example, by components for encapsulating the return spring 105, and yet to realize the assembly advantages of forming an assembly. Overall, this results in an improved pump efficiency with a simplified assembly.
Bei den Ausführungsformen nach den Figuren 1 und 2 erfolgt die Befestigung des Anschlagelementes 113,213 mittels einer umlaufenden Verstemmung, Verpressung oder Rollierung des Vorsprungs 121,221. Andererseits ist auch eine Rastbefestigung (Fig. 3 und 4) möglich. Generell ist die Befestigungsart jedoch unabhängig davon, ob die Befestigungsmittel an dem Anschlagelement 113,213 zylindrisch umlaufend angreifen (Fig. 1 und 4), oder lediglich punktuell (Fig. 2 und 3) vorgesehen sind.In the embodiments according to FIGS. 1 and 2, the stop element 113, 213 is fastened by circumferential caulking, pressing or rolling of the projection 121, 221. On the other hand, a snap fastening (Fig. 3 and 4) is also possible. In general, however, the type of fastening is independent of whether the fastening means engage the stop element 113, 213 in a cylindrical circumferential manner (FIGS. 1 and 4), or are provided only at certain points (FIGS. 2 and 3).
Soweit eine Rastbefestigung vorliegt (Fig. 3,4), verfügt der Befestigungsabschnitt 319,419 vorteilhafter Weise über eine Fase 323,423, welche den Vorsprung 321,421 infolge einer axialen Aufpressbewegung in Radialrichtung aufweitet, bevor der Vorsprung 321,421 in die Radialnut 320,420 einrastet. Die Fase 323,423 bewirkt auch einen selbstzentrierenden Effekt bei der Zusammenführung der Bauteile 306, 313;406,413. Allen Ausfuhrungsformen (Fig. 1 bis 4) ist gemeinsam, daß der Vorsprung 121,221,321,421 an einem im wesentlichen zylindrischen Abschnitt vorgesehen ist, welcher zur Anlage des Federtellers 112,212,312,412 in einen rechtwinklig dazu vorgesehenen, ebenen Anschlagabschnitt 122,222,322,422 übergeht .Insofar as there is a snap fastening (FIG. 3.4), the fastening section 319.419 advantageously has a chamfer 323.423 which widens the projection 321.421 in the radial direction as a result of an axial pressing-on movement before the projection 321.421 snaps into the radial groove 320.420. The chamfer 323.423 also has a self-centering effect when the components 306, 313; 406.413 are brought together. All of the embodiments (FIGS. 1 to 4) have in common that the projection 121, 221, 321, 421 is provided on an essentially cylindrical section which merges into a flat stop section 122, 222, 322, 422 provided at right angles to the spring plate 112, 212, 1212, 412.
Die Ausfuhrungsform gemäß Fig. 4 stimmt im wesentlichen mit der Fig. 1 uberem, wobei jedoch ein als Druckventil ausgebildetes Ruckschlagventil 407 vorgesehen ist. Dabei wird der Ventilkorper 408 mittels einer Feder 409 permanent Richtung Arbeitsraum 411 auf einen tragerseitigen Dichtsitz 410 gepresst,_ und nur unter druckmittelausschiebender Uber- druckwirkung in die im rechten Teilschnitt verdeutlichte Offnungsstellung gebracht. Dies wird einfach mittels Tausch von Offnungsstellung und Schließstellung durch (im Vergleich mit Fig. 1) umgekehrte Anordnung des Ventilkorpers 408 in Bezug auf den Arbeitsraum 411 erreicht. Dabei ragt der Zapfen 426 ersichtlich von dem Arbeitsraum 411 weg.The embodiment according to FIG. 4 is essentially the same as FIG. 1, but a check valve 407 designed as a pressure valve is provided. The valve body 408 is pressed by means of a spring 409 permanently in the direction of the working space 411 onto a sealing seat 410 on the support side, and is brought into the opening position illustrated in the right partial section only under the pressure-relieving overpressure effect. This is achieved simply by exchanging the open position and the closed position by (in comparison with FIG. 1) the reverse arrangement of the valve body 408 with respect to the working space 411. The pin 426 clearly protrudes away from the working space 411.
Wahrend bei der Ausfuhrungsform nach Fig. 1 ein separates, distanzausgleichendes Ausgleichsstuck 124 in Gestalt einer axial elastischen Wellscheibe vorgesehen ist, welche an dem Anschlagabschnitt 122 derart anlegbar ist, daß eine Verschiebungsbewegung oder Einbautoleranzen eines Dichtelementes 125 begrenzt wird, verfugen die Ausfuhrungsformen nach den Fig. 2, 3 und 4 über emstuckig an dem Anschlagelement 213,313,413 angeordnete Ausgleichsstucke 224,324,424 von ggf. unterschiedlicher Lange, welche als frei auskragende Federschenkel ausgebildet sind, und zwecks Lagesicherung des Dichtelementes 225,325,425 axial in dessen Richtung weisen. Dadurch ist das Dichtelement 225,325,425, welches von der Hin- und Herbewegung des Pumpenkolbens 202,302,402 mitgenommen wird, elastisch an die Federschenkel anlegbar. Die Anlage kann prinzipiell unmittelbar an dem Dichtelelement 225,325,425 erfolgen, eine aus der Zeichnung ersichtliche, ebene Unterlegscheibe 128,228,328,428 ist jedoch zur Kraftverteilung sinnvoll, und wird unter der Wirkung der Federkräfte an einer Stufe der Pumpenbohrung 103,203,303,403 abgestützt. Die Unterlegscheibe 128,228,328,428 dient dadurch als Widerlager für das Dichtelement 125,225,325,425. While a separate, distance-compensating compensating piece 124 in the form of an axially elastic corrugated washer is provided in the embodiment according to FIG. 1, which can be applied to the stop section 122 in such a way that a displacement movement or installation tolerances of a sealing element 125 is limited, the embodiments according to FIGS. 2, 3 and 4 about compensating pieces 224, 324, 424 of possibly different lengths, which are arranged on the stop element 213, 334, 413, and which are designed as freely projecting spring legs, and for the purpose of securing the position of the sealing element 225, 325, 255 axially in its direction point. As a result, the sealing element 225, 325, 255, which is carried along by the reciprocating movement of the pump piston 202, 302, 402, can be applied elastically to the spring legs. In principle, the system can be installed directly on the sealing element 225, 325, 255, but a flat washer 128, 228, 288, 288, which can be seen in the drawing, is useful for the force distribution and is supported under the action of the spring forces on a step of the pump bore 103, 203, 303, 403. The washer 128,228,328,428 thus serves as an abutment for the sealing element 125,225,325,425.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
101.201.301.401 Kolbenpumpe101.201.301.401 piston pump
102.202.302.402 Pumpenkolben102.202.302.402 pump piston
103.203.303.403 Pumpenbohrung103.203.303.403 pump bore
104.204.304.404 Aufnahmekörper104.204.304.404 receptacle
105.205.305.405 Rückstellfeder105.205.305.405 return spring
106.206.306.406 Träger106.206.306.406 carrier
107.207.307.407 Rückschlagventil107.207.307.407 check valve
108.208.308.408 Ventilkörper108.208.308.408 valve body
109.209.309.409 Feder109.209.309.409 spring
110.210.310.410 Dichtsitz110.210.310.410 sealing seat
111.211.311.411 Arbeitsraum111.211.311.411 work space
112.212.312.412 Federteller112.212.312.412 spring retainer
113.213.313.413 Anschlagelement113.213.313.413 stop element
114.214.314.414 Boden114.214.314.414 bottom
115.215.315.415 Auflagefläche115.215.315.415 contact surface
116.216.316.416 Stutzen116.216.316.416 nozzle
117.217.317.417 Wandung117.217.317.417 wall
118.218.318.418 Stirnseite118.218.318.418 end face
119.219.319.419 Befestigungsabschnitt119.219.319.419 mounting section
120.220.320.420 Radialnut120.220.320.420 radial groove
121.221.321.421 Vorsprung121,221,321,421 lead
122.222.322. 22 Anschlagabschnitt122,222,322. 22 stop section
123.223.323.423 Fase123.223.323.423 Chamfer
124.224.324.424 Ausgleichsstück124.224.324.424 compensation piece
125.225.325.425 Dichtelement125.225.325.425 sealing element
126.226.326.426 Zapfen126.226.326.426 cones
127.227.327.427 Aufnahmenapf127.227.327.427 receptacle
128.228.328.428 Unterlegscheibe 129,229,329,429 Rückschlagventil 430 Durchgangsbohrung128.228.328.428 washer 129,229,329,429 check valve 430 through hole
131,231,331,431 Ausnehmung 131,231,331,431 recess

Claims

Patentansprüche claims
1. Kolbenpumpe, zum Fördern von Druckmittel in wenigstens eine Fahrzeugbremse oder in einen Druckmittelspeicher, mit den Merkmalen;1. Piston pump, for conveying pressure medium in at least one vehicle brake or in a pressure medium accumulator, with the features;
ein Pumpenkolben (102,202,302,402) ist in einem Aufnahmekörper (104,204,304,404) bewegbar angeordnet;a pump piston (102, 202, 302, 402) is movably arranged in a receiving body (104, 204, 304, 404);
ein Träger (106,206,306,406) trägt ein koaxial zu dem Pumpenkolben (102,202,302,402) angeordnetes Rückschlagventil (107,207,307,407) zur Ventilation eines Arbeitsraumes (1.11,211,311,411), in den der Pumpenkolben (102,202,302,402) eintaucht;a carrier (106,206,306,406) carries a check valve (107,207,307,407) arranged coaxially with the pump piston (102,202,302,402) for ventilation of a working space (1.11,211,311,411) into which the pump piston (102,202,302,402) is immersed;
eine Rückstellfeder (105,205,305,405) ist zwischen Träger (106,206,306,406) und Pumpenkolben (102,202,302,402) angeordnet,a return spring (105,205,305,405) is arranged between the carrier (106,206,306,406) and the pump piston (102,202,302,402),
dadurch gekennzeichnet, daßcharacterized in that
die Rückstellfeder (105,205,305,405) in dem Träger (106,206,306,406) aufgenommen und geführt ist, und daß der Träger (106,206,306,406) zusammen mit einem daran befestigten Anschlagelement (113,213,313,413) einen Käfig für die Rückstellfeder (105,205,305,405) bildet.the return spring (105,205,305,405) is received and guided in the carrier (106,206,306,406), and that the carrier (106,206,306,406) forms a cage for the return spring (105,205,305,405) together with an attached stop element (113,213,313,413).
2. Kolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Träger (106,206,306,406) einen zylindrischen Stutzen (116,216,316,416) aufweist, welcher die Rück- stellfeder (105,205,305,405) radial außen umgreift, so daß die Rückstellfeder (105,205,305,405) an einer Wandung (117,217,317,417) des Stutzen (116,216,316,416) geführt ist.2. Piston pump according to claim 1, characterized in that the carrier (106,206,306,406) has a cylindrical connecting piece (116,216,316,416) which the back Adjustment spring (105,205,305,405) extends radially around the outside, so that the return spring (105,205,305,405) is guided on a wall (117,217,317,417) of the nozzle (116,216,316,416).
3. Kolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Anschlagelement (113,213,313,413) formschlüssig an dem Träger (106,206,306,406) befestigt ist.3. Piston pump according to claim 1, characterized in that the stop element (113,213,313,413) is positively attached to the carrier (106,206,306,406).
4. Kolbenpumpe nach Anspruch 3, dadurch gekennzeichnet, daß das Anschlagelement (113,213,313,413) mit dem Träger (106,206,306,406) verrastet oder verstemmt ist.4. Piston pump according to claim 3, characterized in that the stop element (113,213,313,413) is locked or caulked to the carrier (106,206,306,406).
5. Kolbenpumpe nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Träger (106,206,306,406) im Abstand zu einer anschlagelementseitigen Stirnseite5. Piston pump according to claim 3 or 4, characterized in that the carrier (106,206,306,406) at a distance from a stop element side end
(118.218.318.418) einen Befestigungsabschnitt(118.218.318.418) a fastening section
(119.219.319.419) aufweist, welcher wenigstens eine Radialnut (120,220,320,420) oder eine Vertiefung aufweist, in die ein federnd vorgespannter Vorsprung(119.219.319.419), which has at least one radial groove (120,220,320,420) or a recess into which a resiliently biased projection
(121.221.321.421) des Anschlagelements (113,213,313,413) eingreift.(121.221.321.421) of the stop element (113.213.313.413) engages.
6. Kolbenpumpe nach Anspruch 5, dadurch gekennzeichnet, daß der Vorsprung (121,221,321,421) an einem im wesentlichen zylindrischen Abschnitt des Anschlagelementes (113,213,313,413) vorgesehen ist, welcher in einen rechtwinklig dazu angeordneten Anschlagabschnitt6. Piston pump according to claim 5, characterized in that the projection (121,221,321,421) is provided on a substantially cylindrical portion of the stop element (113,213,313,413) which is arranged in a stop section arranged at right angles thereto
(122.222.322.422) für die Rückstellfeder (105,205,305,405) übergeht. (122.222.322.422) for the return spring (105,205,305,405).
. Kolbenpumpe nach Anspruch 5, dadurch gekennzeichnet, daß der Träger (106,206,306,406) im Bereich seiner Stirnseite (118,218,318,418) eine Fase, Piston pump according to claim 5, characterized in that the carrier (106, 206, 306, 406) has a chamfer in the region of its end face (118, 218, 318, 418)
(123.223.323.423) aufweist, so daß der Vorsprung (121,221,321,421) infolge einer axialen Aufpressbewegung in Radialrichtung aufgeweitet wird, und daß der Vorsprung (121,221,321,421) nach weiterer Aufpressbewegung in die als Hinterschneidung ausgebildete Radialnut(123.223.323.423), so that the projection (121,221,321,421) is expanded as a result of an axial pressing-on movement in the radial direction, and that the projection (121,221,321,421) after further pressing-on movement into the radial groove designed as an undercut
(120,220,320,420) oder Vertiefung einschnappt.(120,220,320,420) or recess snaps into place.
8. Kolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Anschlagelement (113,213,313,413) ein einstük- kig daran ausgebildetes Ausgleichsstück8. Piston pump according to claim 1, characterized in that the stop element (113,213,313,413) is a one-piece compensating piece formed thereon
(124.224.324.424) aufweist.(124.224.324.424).
9. Kolbenpumpe nach Anspruch 8, dadurch gekennzeichnet, daß das Ausgleichsstück (124,224,324,424) einen Federschenkel aufweist, und daß der Federschenkel zwecks Lagesicherung axial in Richtung eines Dichtelementes9. Piston pump according to claim 8, characterized in that the compensating piece (124,224,324,424) has a spring leg, and that the spring leg for the purpose of securing the position axially in the direction of a sealing element
(125.225.325.425) für den Pumpenkolben (102,202,302,402) weist, und daß das Dichtelement (125,225,325,425) federnd an den Federschenkel anlegbar ist .(125.225.325.425) for the pump piston (102.202.302.402), and that the sealing element (125.225.325.425) can be resiliently applied to the spring leg.
10. Kolbenpumpe nach Anspruch 9, dadurch gekennzeichnet, daß das Anschlagelement (113,213,313,413) einen im wesentlichen S-förmigen Querschnitt aufweist. 10. Piston pump according to claim 9, characterized in that the stop element (113,213,313,413) has a substantially S-shaped cross section.
PCT/EP2003/010197 2002-09-24 2003-09-13 Piston pump WO2004029452A1 (en)

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DE2002144373 DE10244373B4 (en) 2002-09-24 2002-09-24 piston pump
DE10244373.4 2002-09-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102434453A (en) * 2011-11-21 2012-05-02 宝鸡石油机械有限责任公司 Guide plate fastening structure for plunger pump

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US20020100507A1 (en) * 2000-05-10 2002-08-01 Robert Bosch Gmbh Check valve for a piston pump
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DE10244373A1 (en) 2004-04-01
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