EP2737208B1 - Piston pump for delivering fluids, and corresponding assembly process for a piston pump - Google Patents

Piston pump for delivering fluids, and corresponding assembly process for a piston pump Download PDF

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Publication number
EP2737208B1
EP2737208B1 EP12724970.4A EP12724970A EP2737208B1 EP 2737208 B1 EP2737208 B1 EP 2737208B1 EP 12724970 A EP12724970 A EP 12724970A EP 2737208 B1 EP2737208 B1 EP 2737208B1
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EP
European Patent Office
Prior art keywords
throttle element
cover
piston pump
cylinder
pressing
Prior art date
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Active
Application number
EP12724970.4A
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German (de)
French (fr)
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EP2737208A1 (en
Inventor
Oliver Gaertner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2737208A1 publication Critical patent/EP2737208A1/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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0091—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using a special shape of fluid pass, e.g. throttles, ducts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49236—Fluid pump or compressor making

Definitions

  • the invention is based on a piston pump for conveying fluids.
  • the present invention also relates to an assembly method for such a piston pump.
  • Piston pumps are known from the prior art in different embodiments.
  • radial piston pumps with a plurality of pump elements for conveying pressure media are frequently used in vehicle brake systems, in which at least one piston can be moved back and forth by means of an eccentric.
  • these so-called pump elements consist of a piston, a piston running surface which is often designed as a cylinder, inlet and outlet valves and sealing elements.
  • the valves serve to control the fluid during the pumping movement of the piston.
  • the inlet valve is used to prevent the fluid from flowing back into the intake chamber during the compression phase.
  • the outlet valve prevents the fluid from flowing back from the pressure side into the pump interior and is typically housed in the cover of the pump.
  • At least one throttle arrangement is provided for throttling the fluid flow after the outlet valve in order to optimize noise and pulsation.
  • a piston pump for brake pressure control in a hydraulic vehicle brake system comprises a pump housing, a receiving bore for the piston pump arranged in the pump housing and a valve cover which closes the receiving pump to the outside, in which an outlet valve and first and second channel sections of an outflow channel are accommodated.
  • the outflow geometry influences the noise behavior of the piston pump and is therefore usually carried out with a suitable tapering of the outflow channel, which then represents a throttling effect.
  • the piston pump for conveying fluids described comprises a piston, a cylinder element and a pressure chamber which is arranged between an inlet valve and an outlet valve and which is closed by a cover, the outlet valve comprising a closing body designed as a ball, a pretensioning device acting on the closing body as a spiral spring, comprises a base element for supporting the pretensioning device and a disk element, and wherein a sealing seat of the outlet valve is arranged on the disk element.
  • the use of the disk element is intended to ensure that component tolerances of different components of the piston pump cannot have a negative effect on the outlet valve.
  • WO 03/004872 A1 describes a piston pump for conveying fluids.
  • the piston pump described comprises a cylinder, a piston movably mounted in the cylinder and a pressure chamber which is arranged between an inlet valve and an outlet valve and is closed by a cover.
  • a throttle element for throttling the fluid flow is provided, which is designed as a spring-elastic disk which is introduced into the cover.
  • the sensor unit according to the invention for a vehicle with the features of independent claim 1 has the advantage that a cost-neutral pre-centering of a throttle element designed as a resilient disc is made possible in a cover without obstructing the oscillating movement of the throttle element during operation.
  • the essence of the invention is a cost-neutral centering of the throttle element designed as a spring-elastic disc.
  • the throttle element is used in the Mounted in the piston pump cover.
  • the pump cylinder is then pressed onto the cover.
  • a centering of the throttle element is provided in the pump cylinder, but a deforming of an insufficiently pre-centered throttle element can occur due to the rapid assembly. It is therefore advisable to pre-center the throttle element in the cover before installing the pump cylinder. This precentering must not restrict the throttle element in its movement, however, because a blocked throttle element prevents the piston pump from functioning and can lead to a system failure due to overloading of a drive.
  • Embodiments of the present invention provide a piston pump for conveying fluids, which comprises a cylinder, a piston movably mounted in the cylinder, and a pressure space arranged between an inlet valve and an outlet valve, which is closed off by a cover, the fluid flow after the Exhaust valve a throttle element is provided for throttling the fluid flow.
  • the throttle element is designed as a resilient disk which is introduced into the cover, means for precentering the throttle element being present in the cover.
  • At least two press webs are formed on the cover, on which the cylinder is pressed with the cover, at least one recess formed between two press webs acting as an outflow channel for the fluid flow.
  • the centering means comprise at least one chamfer, which is arranged on the back of such a pressing web in the pressing direction.
  • the bevels can be implemented in a cost-neutral manner in the cover, which is designed, for example, as a cold impact part.
  • a throttle element for throttling in the fluid flow after the outlet valve the fluid flow is provided, the throttle element is designed as a resilient disc and inserted into the cover. This causes arranged in the lid Centering means a pre-centering of the throttle element in the cover and the cylinder element is pressed into the cover after the introduction and pre-centering of the throttle element.
  • the individual bevels each have an acute angle, which is preferably greater than 60 °. Because of the acute angle, it can advantageously be ensured that the throttle element does not jam on the chamfer or the centering means during operation.
  • annular channel is formed in the cover, which is covered by the throttle element and, when the outlet valve is open, is filled with fluid which flows into at least one outflow channel via the throttle element.
  • the throttle element designed as a resilient disc is arranged between the cylinder and the cover and variably adjusts the flow cross section in the at least one outflow channel as a function of the pressure difference between its top and bottom.
  • the throttle element designed as a resilient disc can be arranged under a defined prestress between the cover and the cylinder, so that an opening differential pressure is predetermined. The pressure difference lifts the throttle element designed as a spring-elastic disk from the side with the higher pressure, so that the throttle element designed as a spring-elastic disk performs a deformation movement along the axis of symmetry and increases the flow cross section.
  • the deformation movement of the throttle element designed as a spring-elastic disk can be limited by a corresponding shaping of an end face of the cylinder.
  • the service life of the throttle element can be increased in an advantageous manner.
  • fluidic end position damping can further optimize the opening and noise behavior.
  • the throttle element designed as a spring-elastic disk has a first opening through which it can flow, wherein when the throttle element designed as a spring-elastic disk is in a raised position, the first opening of the throttle element designed as a spring-elastic disk flows through and / or the flow around the throttle element designed as a spring-elastic disk.
  • a second opening with a defined constant flow cross section that is released independently of the differential pressure.
  • the second opening can be introduced, for example, as a bore in the throttle element designed as a spring-elastic disk and / or as a depression in supports and / or as an annular gap.
  • the second opening in the throttle element designed as a resilient disc acts as an additional static throttle and enables a dynamic throttle with a static component to be implemented simply and inexpensively.
  • the advantage of such a construction is that the positive functions of a dynamic choke can be combined and integrated very inexpensively and easily with a static choke. It is an additional component that can be designed, for example, as a stamped part or as an etched component.
  • the throttle element designed as a spring-elastic disc bends and the dynamic throttle opens, so that a large amount of fluid can also flow out. Below the specified pressure difference, a smaller amount of fluid flows over the static throttle, i.e. through the second opening.
  • the throttle element When a dynamic throttle is integrated into a piston pump, which is used, for example, in an anti-lock braking system (ABS) and / or for an electronic stability program in the vehicle, the throttle element can be centered, for example, by a small chamfer on the cylinder. A rough centering over the outer diameter of the throttle element on the cover is only possible to a limited extent, since the throttle element can deform due to the high press-in speeds of the cylinder if the latter is not correctly centered. In addition, it must be prevented that the throttle element rests on one side and the throttle element may jam. A clamping throttle element prevents the dynamic throttle element from kinking and prevents the high flow rate. This can U can lead to a complete failure of the system because the drive is overloaded.
  • ABS anti-lock braking system
  • a throttle element 30 for throttling the fluid flow 3 is provided in a fluid flow 3 after the outlet valve 5.
  • the outlet valve 5 comprises a closing body 5.1 designed as a ball, an outlet valve seat 5.2 as well as a return spring 5.3 and adjusts the fluid flow 3 between an outlet opening 26 of the pressure chamber 24 and at least one outflow channel 7 of the piston pump 1.
  • the throttle element 30 is designed as a resilient disc and clamped between the cover 10 and the cylinder.
  • the throttle element 30, which is designed as a spring-elastic disk, has a first opening 34, which is adapted to the dimension of the closing body 5.1.
  • the throttle element 30, designed as a resilient disc is clamped between a first support on the cylinder 20 and a second and third support arranged in the cover 10.
  • Throttle element 30 exists between the second support arranged in the cover 10, on which the outer edge of the throttle element 30 designed as a spring-elastic disc rests, and the third support arranged in the cover 10, on which the inner edge of the throttle element 30 designed as a spring-elastic disc lies in the region of the lies first opening 34, an offset dv1, which leads to a preload in the throttle element 30 designed as a spring-elastic disc, which must be applied by a prevailing fluid pressure in order to lift the outer edge of the throttle element 30 designed as a spring-elastic disc from the third support.
  • the inner edge of the throttle element 30, which is designed as a spring-elastic disk lies both on the first bearing arranged on the cylinder element 20 and on the second bearing
  • a deformation movement ds1 of the throttle element 30 designed as a spring-elastic disk is limited by a corresponding shaping of an end face 22 of the cylinder 20.
  • the end face 22 is curved, the dimensions of the curvature specifying the maximum possible deformation movement of the throttle element 30 designed as a spring-elastic disk.
  • Fig. 2 shows the piston pump 1 at a differential pressure which is lower than a predetermined limit pressure value, so that the throttle element designed as a spring-elastic disk rests on all supports and only the static throttle acts, so that a flowing fluid flow 3.1 through a hole in the as a spring-elastic disk throttle element 30 introduced second opening 36 is determined.
  • FIG. 3 shows the piston pump 1 at a differential pressure that is higher than the predetermined limit pressure value, so that the outer edge of the throttle element 30 designed as a spring-elastic disc is lifted off the third support and only the inner edge of the throttle element designed as a spring-elastic disc on the first and second supports is applied.
  • the dynamic throttle acts, so that a further fluid flow 3.2 flows around the throttle element, which is designed as a spring-elastic disk, and which forms an outflowing total fluid flow 3 with the fluid flow 3.1 flowing through the second opening 36.
  • An annular channel 12 is formed in the cover 10 and is covered by the throttle element 30. The fluid arrives when the outlet valve 5 is open, ie when it comes out of the outlet valve seat 5.2 lifted closing body 5.1, via a connecting channel 14 into the ring channel 58 and flows through the throttle element 30 into at least one outflow channel 7.
  • centering means 18 are present in the cover 10 according to the invention, which cause the throttle element 30 to be pre-centered in the cover 10.
  • six press webs 16 are formed in the cover 10, on which the cylinder 20 can be pressed with the cover 10.
  • a recess 17 is formed between each of two press bars 16, which act as outflow channels 7 for the fluid flow 3 when the cylinder 20 is pressed in.
  • the cover 10 of the piston pump 1 has six cutouts 18 and the piston pump 1 thus has six outflow channels 7.
  • the centering means 18 comprise at least one chamfer, which is arranged on the back of the pressing web 16 in the pressing direction.
  • the centering means 18 comprise six chamfers.
  • the individual bevels 18 each have an acute angle ⁇ , which is preferably greater than 60 °, in order to prevent jamming of the throttle element 30, which is designed as a spring-elastic disk.
  • the throttle element 30 is designed as a spring-elastic disk and is introduced into the cover 10.
  • the centering means 18 arranged in the cover 10 causes the throttle element 30 to be pre-centered in the cover 10, and the cylinder element 20 can be pressed into the cover 10 after the throttle element 30 has been introduced and pre-centered, without deforming the throttle element 30, which is designed as a spring-elastic disc or damage.
  • second centering means 28 are provided, which are designed as a circumferential collar adapted to the first opening 34 in the throttle element 30 and bring about a final centering of the throttle element 30.
  • Embodiments of the present invention advantageously enable a cost-neutral pre-centering of the throttle element in the cover of the piston pump.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kolbenpumpe zur Förderung von Fluiden nach der Gattung des unabhängigen Patentanspruchs 1. Zudem betrifft die vorliegende Erfindung ein Montageverfahren für eine solche Kolbenpumpe.The invention is based on a piston pump for conveying fluids. The present invention also relates to an assembly method for such a piston pump.

Kolbenpumpen sind aus dem Stand der Technik in unterschiedlichen Ausführungsformen bekannt. Beispielsweise werden in Fahrzeugbremsanlagen häufig Radialkolbenpumpen mit mehreren Pumpelementen zur Förderung von Druckmitteln verwendet, bei welchen wenigstens ein Kolben mittels eines Exzenters hin und her bewegt werden kann. Typischerweise bestehen diese sogenannten Pumpenelemente aus einem Kolben, einer häufig als Zylinder ausgebildeten Kolbenlauffläche, Einlass- und Auslassventilen sowie Dichtelementen. Die Ventile dienen der Fluidsteuerung bei der Pumpbewegung des Kolbens. Hierbei dient das Einlassventil dazu, das Fluid während der Verdichtungsphase nicht in den Ansaugraum zurückströmen zu lassen. Das Auslassventil verhindert die Rückströmung des Fluides von der Druckseite in den Pumpeninnenraum und ist typischerweise im Deckel der Pumpe untergebracht. Zur Geräusch- und Pulsationsoptimierung ist zum Drosseln der Fluidströmung nach dem Auslassventil mindestens eine Drosselanordnung vorgesehen.Piston pumps are known from the prior art in different embodiments. For example, radial piston pumps with a plurality of pump elements for conveying pressure media are frequently used in vehicle brake systems, in which at least one piston can be moved back and forth by means of an eccentric. Typically, these so-called pump elements consist of a piston, a piston running surface which is often designed as a cylinder, inlet and outlet valves and sealing elements. The valves serve to control the fluid during the pumping movement of the piston. The inlet valve is used to prevent the fluid from flowing back into the intake chamber during the compression phase. The outlet valve prevents the fluid from flowing back from the pressure side into the pump interior and is typically housed in the cover of the pump. At least one throttle arrangement is provided for throttling the fluid flow after the outlet valve in order to optimize noise and pulsation.

In der Offenlegungsschrift DE 10 2008 002 740 A1 wird beispielsweise eine Kolbenpumpe zur Bremsdruckregelung in einer hydraulischen Fahrzeugbremsanlage beschrieben. Die beschriebene Kolbenpumpe umfasst ein Pumpengehäuse, eine im Pumpengehäuse angeordnete Aufnahmebohrung für die Kolbenpumpe und einen die Aufnahmepumpe nach außen verschließenden Ventildeckel, in welchem ein Auslassventil und erste und zweite Kanalabschnitte eines Abströmkanals untergebracht sind. Die Abströmgeometrie beeinflusst das Geräuschverhalten der Kolbenpumpe und wird deswegen meist mit einer geeigneten Verjüngung des Abströmkanals ausgeführt, welche dann eine Drosselwirkung darstellt.In the published application DE 10 2008 002 740 A1 For example, a piston pump for brake pressure control in a hydraulic vehicle brake system is described. The piston pump described comprises a pump housing, a receiving bore for the piston pump arranged in the pump housing and a valve cover which closes the receiving pump to the outside, in which an outlet valve and first and second channel sections of an outflow channel are accommodated. The outflow geometry influences the noise behavior of the piston pump and is therefore usually carried out with a suitable tapering of the outflow channel, which then represents a throttling effect.

In der Offenlegungsschrift DE 10 2006 027 555 A1 wird beispielsweise eine Kolbenpumpe mit reduzierter Geräuschentwicklung beschrieben. Die beschriebene Kolbenpumpe zur Förderung von Fluiden umfasst einen Kolben, ein Zylinderelement und einen zwischen einem Einlassventil und einem Auslassventil angeordneten Druckraum, welcher von einem Deckel abgeschlossen ist, wobei das Auslassventil einen als Kugel ausgeführten Schließkörper, eine auf den Schließkörper wirkende als Spiralfeder ausgeführte Vorspanneinrichtung, ein Basiselement zum Abstützen der Vorspanneinrichtung und ein Scheibenelement umfasst, und wobei ein Dichtsitz des Auslassventils am Scheibenelement angeordnet ist. Durch die Verwendung des Scheibenelements soll sichergestellt werden, dass Bauteiltoleranzen verschiedener Bauteile der Kolbenpumpe sich nicht negativ auf das Auslassventil auswirken können.In the published application DE 10 2006 027 555 A1 For example, a piston pump with reduced noise is described. The piston pump for conveying fluids described comprises a piston, a cylinder element and a pressure chamber which is arranged between an inlet valve and an outlet valve and which is closed by a cover, the outlet valve comprising a closing body designed as a ball, a pretensioning device acting on the closing body as a spiral spring, comprises a base element for supporting the pretensioning device and a disk element, and wherein a sealing seat of the outlet valve is arranged on the disk element. The use of the disk element is intended to ensure that component tolerances of different components of the piston pump cannot have a negative effect on the outlet valve.

In der WO 03/004872 A1 wird eine Kolbenpumpe zur Förderung von Fluiden beschrieben. Die beschriebene Kolbenpumpe umfasst einen Zylinder, einen im Zylinder beweglich gelagerten Kolben und einen zwischen einem Einlassventil und einem Auslassventil angeordneten Druckraum, welcher von einem Deckel abgeschlossen ist. In der Fluidströmung nach dem Auslassventil ist ein Drosselelement zum Drosseln der Fluidströmung vorgesehen, welches als federelastische Scheibe ausgeführt ist, welche in den Deckel eingebracht ist.In the WO 03/004872 A1 describes a piston pump for conveying fluids. The piston pump described comprises a cylinder, a piston movably mounted in the cylinder and a pressure chamber which is arranged between an inlet valve and an outlet valve and is closed by a cover. In the fluid flow after the outlet valve, a throttle element for throttling the fluid flow is provided, which is designed as a spring-elastic disk which is introduced into the cover.

Offenbarung der ErfindungDisclosure of the invention

Die erfindungsgemäße Sensoreinheit für ein Fahrzeug mit den Merkmalen des unabhängigen Patentanspruchs 1 hat demgegenüber den Vorteil, dass eine kostenneutrale Vorzentrierung eines als federelastische Scheibe ausgeführten Drosselelements in einem Deckel ohne Behinderung der Schwingbewegung des Drosselelements im Betrieb ermöglicht wird.The sensor unit according to the invention for a vehicle with the features of independent claim 1 has the advantage that a cost-neutral pre-centering of a throttle element designed as a resilient disc is made possible in a cover without obstructing the oscillating movement of the throttle element during operation.

Der Kern der Erfindung ist eine kostenneutrale Zentrierung des als federelastische Scheibe ausgeführten Drosselelements. Das Drosselelement wird bei der Montage in den Deckel der Kolbenpumpe eingebracht. Danach wird der Pumpenzylinder auf den Deckel gepresst. Im Pumpenzylinder ist zwar eine Zentrierung des Drosselelements vorgesehen, es kann aber aufgrund der schnellen Montage zu einer Verformung eines nicht ausreichend vorzentrierten Drosselelements kommen. Daher ist es sinnvoll das Drosselelement vor Montage des Pumpenzylinders im Deckel vorzuzentrieren. Diese Vorzentrierung darf das Drosselelement in seiner Bewegung allerdings nicht einschränken, denn ein blockiertes Drosselelement verhindert die Funktion der Kolbenpumpe und kann durch eine Überlastung eines Antriebs zu einem Ausfall des Systems führen.The essence of the invention is a cost-neutral centering of the throttle element designed as a spring-elastic disc. The throttle element is used in the Mounted in the piston pump cover. The pump cylinder is then pressed onto the cover. A centering of the throttle element is provided in the pump cylinder, but a deforming of an insufficiently pre-centered throttle element can occur due to the rapid assembly. It is therefore advisable to pre-center the throttle element in the cover before installing the pump cylinder. This precentering must not restrict the throttle element in its movement, however, because a blocked throttle element prevents the piston pump from functioning and can lead to a system failure due to overloading of a drive.

Ausführungsformen der vorliegenden Erfindung stellen eine Kolbenpumpe zur Förderung von Fluiden zur Verfügung, welche einen Zylinder, einen im Zylinder beweglich gelagerten Kolben, und einen zwischen einem Einlassventil und einem Auslassventil angeordneten Druckraum umfasst, welcher von einem Deckel abgeschlossen ist, wobei in der Fluidströmung nach dem Auslassventil ein Drosselelement zum Drosseln der Fluidströmung vorgesehen ist. Hierbei ist das Drosselelement als federelastische Scheibe ausgeführt, welche in den Deckel eingebracht ist, wobei im Deckel Mittel zur Vorzentrierung des Drosselelements vorhanden sind.Embodiments of the present invention provide a piston pump for conveying fluids, which comprises a cylinder, a piston movably mounted in the cylinder, and a pressure space arranged between an inlet valve and an outlet valve, which is closed off by a cover, the fluid flow after the Exhaust valve a throttle element is provided for throttling the fluid flow. Here, the throttle element is designed as a resilient disk which is introduced into the cover, means for precentering the throttle element being present in the cover.

Hierbei sind am Deckel mindestens zwei Pressstege ausgebildet, an welchen der Zylinder mit dem Deckel verpresst ist, wobei mindestens eine zwischen zwei Pressstegen ausgebildete Aussparung als Abströmkanal für die Fluidströmung wirkt. Die Zentriermittel umfassen mindestens eine Fase, welche in Anpressrichtung hintenliegend an einem solchen Presssteg angeordnet ist. In diesem Bereich kann es in vorteilhafter Weise zu keinen Behinderungen aufgrund des Einpressens des Zylinders kommen. Des Weiteren können die Fasen kostenneutral in dem beispielsweise als Kaltschlagteil ausgeführten Deckel umgesetzt werden.In this case, at least two press webs are formed on the cover, on which the cylinder is pressed with the cover, at least one recess formed between two press webs acting as an outflow channel for the fluid flow. The centering means comprise at least one chamfer, which is arranged on the back of such a pressing web in the pressing direction. In this area, there can advantageously be no obstructions due to the pressing in of the cylinder. Furthermore, the bevels can be implemented in a cost-neutral manner in the cover, which is designed, for example, as a cold impact part.

Bei einem erfindungsgemäßen Verfahren zur Montage einer Kolbenpumpe, welche einen Zylinder, einen im Zylinder beweglich gelagerten Kolben, und einen zwischen einem Einlassventil und einem Auslassventil angeordneten Druckraum umfasst, welcher von einem Deckel abgeschlossen ist, wobei in der Fluidströmung nach dem Auslassventil ein Drosselelement zum Drosseln der Fluidströmung vorgesehen ist, wird das Drosselelement als federelastische Scheibe ausgeführt und in den Deckel eingebracht. Hierbei bewirken im Deckel angeordnete Zentriermittel eine Vorzentrierung des Drosselelements im Deckel und das Zylinderelement wird nach dem Einbringen und der Vorzentrierung des Drosselelements in den Deckel eingepresst.In a method according to the invention for assembling a piston pump, which comprises a cylinder, a piston movably mounted in the cylinder, and a pressure chamber arranged between an inlet valve and an outlet valve, which is closed off by a cover, a throttle element for throttling in the fluid flow after the outlet valve the fluid flow is provided, the throttle element is designed as a resilient disc and inserted into the cover. This causes arranged in the lid Centering means a pre-centering of the throttle element in the cover and the cylinder element is pressed into the cover after the introduction and pre-centering of the throttle element.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen und Weiterbildungen sind vorteilhafte Verbesserungen der im unabhängigen Patentanspruch 1 angegebenen Kolbenpumpe möglich.The measures and further developments listed in the dependent claims make advantageous improvements of the piston pump specified in independent claim 1 possible.

In vorteilhafter Ausgestaltung der erfindungsgemäßen Kolbenpumpe weisen die einzelnen Fasen jeweils einen spitzen Winkel auf, welcher vorzugsweise größer als 60° ist. Aufgrund des spitzen Winkels kann in vorteilhafter Weise sichergestellt werden, dass das Drosselelement im Betrieb nicht an der Fase bzw. den Zentriermitteln klemmt.In an advantageous embodiment of the piston pump according to the invention, the individual bevels each have an acute angle, which is preferably greater than 60 °. Because of the acute angle, it can advantageously be ensured that the throttle element does not jam on the chamfer or the centering means during operation.

In weiterer vorteilhafter Ausgestaltung der erfindungsgemäßen Kolbenpumpe ist im Deckel ein Ringkanal ausgebildet, welcher vom Drosselelement abgedeckt und bei geöffnetem Auslassventil mit Fluid gefüllt ist, welches über das Drosselelement in mindestens einen Abströmkanal abfließt.In a further advantageous embodiment of the piston pump according to the invention, an annular channel is formed in the cover, which is covered by the throttle element and, when the outlet valve is open, is filled with fluid which flows into at least one outflow channel via the throttle element.

In weiterer vorteilhafter Ausgestaltung der erfindungsgemäßen Kolbenpumpe ist das als federelastische Scheibe ausgeführte Drosselelement zwischen dem Zylinder und dem Deckel angeordnet und stellt den Strömungsquerschnitt in dem mindestens einen Abströmkanal in Abhängigkeit von der Druckdifferenz zwischen seiner Oberseite und der Unterseite variabel ein. Durch diesen variablen Drosselquerschnitt kann mit einfachen und kostengünstigen Bauteilen, welche prozesssicher zu montieren sind, eine Reduktion von Pulsationen in einem Fluidsystem und ein robustes Design erzielt werden. Das als federelastische Scheibe ausgeführte Drosselelement kann unter einer definierten Vorspannung zwischen dem Deckel und dem Zylinder angeordnet werden, so dass ein Öffnungsdifferenzdruck vorgegeben ist. Die Druckdifferenz hebt das als federelastische Scheibe ausgeführte Drosselelement von der Seite mit dem höheren Druck ab, so dass das als federelastische Scheibe ausgeführte Drosselelement entlang der Symmetrieachse eine Deformationsbewegung ausführt und den Strömungsquerschnitt vergrößert.In a further advantageous embodiment of the piston pump according to the invention, the throttle element designed as a resilient disc is arranged between the cylinder and the cover and variably adjusts the flow cross section in the at least one outflow channel as a function of the pressure difference between its top and bottom. Through this variable throttle cross-section, a reduction in pulsations in a fluid system and a robust design can be achieved with simple and inexpensive components that can be assembled reliably. The throttle element designed as a resilient disc can be arranged under a defined prestress between the cover and the cylinder, so that an opening differential pressure is predetermined. The pressure difference lifts the throttle element designed as a spring-elastic disk from the side with the higher pressure, so that the throttle element designed as a spring-elastic disk performs a deformation movement along the axis of symmetry and increases the flow cross section.

In weiterer vorteilhafter Ausgestaltung der erfindungsgemäßen Kolbenpumpe kann die Deformationsbewegung des als federelastische Scheibe ausgeführten Drosselelements durch eine entsprechende Formgebung einer Stirnfläche des Zylinders begrenzt werden. Dadurch kann in vorteilhafter Weise die Lebensdauer des Drosselelements gesteigert werden. Im Bereich des Anschlags kann eine fluidische Endlagendämpfung das Öffnungs- und Geräuschverhalten weiter optimieren.In a further advantageous embodiment of the piston pump according to the invention, the deformation movement of the throttle element designed as a spring-elastic disk can be limited by a corresponding shaping of an end face of the cylinder. As a result, the service life of the throttle element can be increased in an advantageous manner. In the area of the stop, fluidic end position damping can further optimize the opening and noise behavior.

Besonders vorteilhaft ist, dass das als federelastische Scheibe ausgeführte Drosselelement eine durchströmbare erste Öffnung aufweist, wobei bei einer abgehobenen Stellung des als federelastische Scheibe ausgeführten Drosselelements die erste Öffnung des als federelastische Scheibe ausgeführten Drosselelements durchströmt und/oder das als federelastische Scheibe ausgeführte Drosselelement umströmt ist.It is particularly advantageous that the throttle element designed as a spring-elastic disk has a first opening through which it can flow, wherein when the throttle element designed as a spring-elastic disk is in a raised position, the first opening of the throttle element designed as a spring-elastic disk flows through and / or the flow around the throttle element designed as a spring-elastic disk.

In weiterer vorteilhafter Ausgestaltung der erfindungsgemäßen Kolbenpumpe ist eine unabhängig vom Differenzdruck freigegebene zweite Öffnung mit einem definierten konstanten Strömungsquerschnitt vorhanden. Die zweite Öffnung kann beispielsweise als Bohrung in das als federelastische Scheibe ausgeführte Drosselelement und/oder als Vertiefung in Auflager eingebracht und/oder als Ringspalt ausgeführt werden. Die zweite Öffnung im als federelastische Scheibe ausgeführten Drosselelement wirkt als zusätzliche statische Drossel und ermöglicht eine einfache und kostengünstige Implementierung einer dynamischen Drossel mit einem statischen Anteil. Der Vorteil einer solchen Konstruktion liegt darin, dass die positiven Funktionen einer dynamischen Drossel sehr kostengünstig und montagefreundlich mit einer statischen Drossel kombiniert und integriert werden können. Es handelt sich um ein zusätzliches Bauteil, das beispielsweise als Stanzteil oder als geätztes Bauteil ausgeführt werden kann. Wenn eine bestimmte Druckdifferenz erreicht wird, biegt sich das als federelastische Scheibe ausgeführte Drosselelement durch und die dynamische Drossel öffnet, so dass zusätzlich eine große Fluidmenge abströmen kann. Unterhalb der vorgegebenen Druckdifferenz strömt eine kleinere Fluidmenge über die statische Drossel, d.h. durch die zweite Öffnung ab.In a further advantageous embodiment of the piston pump according to the invention, there is a second opening with a defined constant flow cross section that is released independently of the differential pressure. The second opening can be introduced, for example, as a bore in the throttle element designed as a spring-elastic disk and / or as a depression in supports and / or as an annular gap. The second opening in the throttle element designed as a resilient disc acts as an additional static throttle and enables a dynamic throttle with a static component to be implemented simply and inexpensively. The advantage of such a construction is that the positive functions of a dynamic choke can be combined and integrated very inexpensively and easily with a static choke. It is an additional component that can be designed, for example, as a stamped part or as an etched component. When a certain pressure difference is reached, the throttle element designed as a spring-elastic disc bends and the dynamic throttle opens, so that a large amount of fluid can also flow out. Below the specified pressure difference, a smaller amount of fluid flows over the static throttle, i.e. through the second opening.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. In den Zeichnungen bezeichnen gleiche Bezugszeichen Komponenten bzw. Elemente, die gleiche bzw. analoge Funktionen ausführen.An embodiment of the invention is shown in the drawings and is explained in more detail in the following description. Designate in the drawings same reference numerals components or elements that perform the same or analog functions.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

  • Fig. 1 zeigt eine perspektivische Schnittdarstellung eines hinteren Bereichs eines Ausführungsbeispiels einer erfindungsgemäßen Kolbenpumpe zur Förderung von Fluiden. Fig. 1 shows a perspective sectional view of a rear region of an embodiment of a piston pump according to the invention for conveying fluids.
  • Fig. 2 zeigt eine Detaildarstellung der erfindungsgemäßen Kolbenpumpe aus Fig. 1 in einem ersten Zustand. Fig. 2 shows a detailed view of the piston pump according to the invention Fig. 1 in a first state.
  • Fig. 3 zeigt eine Detaildarstellung der erfindungsgemäßen Kolbenpumpe aus Fig. 1 in einem zweiten Zustand. Fig. 3 shows a detailed view of the piston pump according to the invention Fig. 1 in a second state.
  • Fig. 4 zeigte eine perspektivische Darstellung eines Drosselelements für die Kolbenpumpe aus Fig. 1. Fig. 4 showed a perspective view of a throttle element for the piston pump Fig. 1 ,
  • Fig. 5 zeigte eine perspektivische Darstellung eines Zylinders für die Kolbenpumpe aus Fig. 1. Fig. 5 showed a perspective view of a cylinder for the piston pump Fig. 1 ,
  • Fig. 6 zeigte eine perspektivische Darstellung eines Deckels für die Kolbenpumpe aus Fig. 1. Fig. 6 showed a perspective view of a cover for the piston pump Fig. 1 ,
  • Fig. 7 zeigt eine perspektivische Detaildarstellung des Deckels für eine Kolbenpumpe aus Fig. 6. Fig. 7 shows a perspective detailed view of the cover for a piston pump Fig. 6 ,
  • Fig. 8 zeigte eine perspektivische Darstellung des Deckels aus Fig. 6 oder 7 mit dem eingelegten Drosselelement aus Fig. 4. Fig. 8 showed a perspective view of the lid 6 or 7 with the throttle element inserted Fig. 4 ,
  • Fig. 9 zeigt eine perspektivische Detaildarstellung eines Ausschnitts des Deckels für eine Kolbenpumpe aus Fig. 6 bis 8 mit einem eingepressten Zylinder. Fig. 9 shows a perspective detailed view of a section of the cover for a piston pump 6 to 8 with a pressed-in cylinder.
Ausführungsformen der ErfindungEmbodiments of the invention

Bei der Integration einer dynamischen Drossel in eine Kolbenpumpe, die beispielsweise in einem Antiblockiersystem (ABS) und/oder für ein elektronisches Stabilitätsprogramm im Fahrzeug eingesetzt wird, kann die Zentrierung des Drosselelements beispielsweise durch eine kleine Fase am Zylinder vorgenommen werden. Eine Grobzentrierung über den Außendurchmesser des Drosselelements am Deckel ist nur bedingt möglich, da aufgrund der hohen Einpressgeschwindigkeiten des Zylinders in den Deckel eine Verformung des Drosselelements stattfinden kann, wenn diese nicht korrekt zentriert ist. Außerdem muss verhindert werden, dass das Drosselelement einseitig anliegt und es so zu einem evtl. Klemmen des Drosselelements kommen kann. Durch ein klemmendes Drosselelement wird die Knickfunktion des dynamischen Drosselelements verhindert und der hohe Durchfluss wird verhindert. Dies kann u. U. zu einem Komplettausfall des Systems führen, da der Antrieb überlastet wird.When a dynamic throttle is integrated into a piston pump, which is used, for example, in an anti-lock braking system (ABS) and / or for an electronic stability program in the vehicle, the throttle element can be centered, for example, by a small chamfer on the cylinder. A rough centering over the outer diameter of the throttle element on the cover is only possible to a limited extent, since the throttle element can deform due to the high press-in speeds of the cylinder if the latter is not correctly centered. In addition, it must be prevented that the throttle element rests on one side and the throttle element may jam. A clamping throttle element prevents the dynamic throttle element from kinking and prevents the high flow rate. This can U can lead to a complete failure of the system because the drive is overloaded.

Wie aus Fig. 1 bis 9 ersichtlich ist, umfasst das dargestellte Ausführungsbeispiel einer erfindungsgemäßen Kolbenpumpe 1 zur Förderung von Fluiden in einem Fahrzeugbremssystem einen nicht dargestellten Kolben, einen Zylinder 20 und einen zwischen einem nicht dargestellten Einlassventil und einem Auslassventil 5 angeordneten Druckraum 24, welcher von einem Deckel 10 abgeschlossen ist, wobei in einer Fluidströmung 3 nach dem Auslassventil 5 ein Drosselelement 30 zur Drosselung der Fluidströmung 3 vorgesehen ist.How out 1 to 9 It can be seen that the illustrated embodiment of a piston pump 1 according to the invention for delivering fluids in a vehicle brake system comprises a piston (not shown), a cylinder 20 and a pressure chamber 24 arranged between an inlet valve (not shown) and an outlet valve 5, which is closed off by a cover 10 A throttle element 30 for throttling the fluid flow 3 is provided in a fluid flow 3 after the outlet valve 5.

Wie aus Fig. 1 weiter ersichtlich ist, umfasst das Auslassventil 5 einen als Kugel ausgeführten Schließkörper 5.1, einen Auslassventilsitz 5.2 sowie eine Rückstellfeder 5.3 und stellt die Fluidströmung 3 zwischen einer Auslassöffnung 26 des Druckraums 24 und mindestens einem Abströmkanal 7 der Kolbenpumpe 1 ein. Das Drosselelement 30 ist als federelastische Scheibe ausgeführt und zwischen dem Deckel 10 und dem Zylinder eingespannt. Im dargestellten Ausführungsbeispiel weist das als federelastische Scheibe ausgeführte Drosselelement 30 eine erste Öffnung 34 auf, welche an die Abmessung des Schließkörpers 5.1 angepasst ist.How out Fig. 1 Furthermore, the outlet valve 5 comprises a closing body 5.1 designed as a ball, an outlet valve seat 5.2 as well as a return spring 5.3 and adjusts the fluid flow 3 between an outlet opening 26 of the pressure chamber 24 and at least one outflow channel 7 of the piston pump 1. The throttle element 30 is designed as a resilient disc and clamped between the cover 10 and the cylinder. In the exemplary embodiment shown, the throttle element 30, which is designed as a spring-elastic disk, has a first opening 34, which is adapted to the dimension of the closing body 5.1.

Wie aus Fig.1 bis 5 weiter ersichtlich ist, ist das als federelastische Scheibe ausgeführte Drosselelement 30 zwischen einem ersten Auflager am Zylinder 20 und einem zweiten und dritten im Deckel 10 angeordneten Auflager eingespannt. Zur Einstellung der Vorspannung des als federelastische Scheibe ausgeführten Drosselelements 30 besteht zwischen dem im Deckel 10 angeordneten zweiten Auflager, an welchem der äußere Rand des als federelastische Scheibe ausgeführten Drosselelements 30 aufliegt, und dem im Deckel 10 angeordneten dritten Auflager, an welchem der innere Rand des als federelastische Scheibe ausgeführten Drosselelements 30 im Bereich der ersten Öffnung 34 aufliegt, ein Versatz dv1, welcher zu einer Vorspannung im als federelastische Scheibe ausgeführten Drosselelement 30 führt, welche von einem herrschenden Fluiddruck aufgebracht werden muss, um den äußeren Rand des als federelastische Scheibe ausgeführtes Drosselelements 30 vom dritten Auflager abzuheben. Hierbei liegt der innere Rand des als federelastische Scheibe ausgeführtes Drosselelements 30 unabhängig vom herrschenden Druck sowohl am ersten am Zylinderelement 20 angeordneten ersten Auflager und dem im Deckel 10 angeordneten zweiten Auflager auf.How out Fig. 1 to 5 it can also be seen that the throttle element 30, designed as a resilient disc, is clamped between a first support on the cylinder 20 and a second and third support arranged in the cover 10. To adjust the preload of the spring-elastic disc Throttle element 30 exists between the second support arranged in the cover 10, on which the outer edge of the throttle element 30 designed as a spring-elastic disc rests, and the third support arranged in the cover 10, on which the inner edge of the throttle element 30 designed as a spring-elastic disc lies in the region of the lies first opening 34, an offset dv1, which leads to a preload in the throttle element 30 designed as a spring-elastic disc, which must be applied by a prevailing fluid pressure in order to lift the outer edge of the throttle element 30 designed as a spring-elastic disc from the third support. Here, the inner edge of the throttle element 30, which is designed as a spring-elastic disk, lies both on the first bearing arranged on the cylinder element 20 and on the second bearing arranged in the cover 10, regardless of the prevailing pressure.

Wie aus Fig. 1 bis 5 weiter ersichtlich ist, ist eine Deformationsbewegung ds1 des als federelastische Scheibe ausgeführten Drosselelements 30 durch eine entsprechende Formgebung einer Stirnfläche 22 des Zylinders 20 begrenzt. Im dargestellten Ausführungsbeispiel ist die Stirnfläche 22 gewölbt ausgeführt, wobei die Abmessungen der Wölbung die maximal mögliche Deformationsbewegung des als federelastische Scheibe ausgeführtes Drosselelements 30 vorgeben. Fig. 2 zeigt die Kolbenpumpe 1 bei einem Differenzdruck, der niedriger als ein vorgegebenen Grenzdruckwert ist, so dass das als federelastische Scheibe ausgeführte Drosselelement an allen Auflagern anliegt und nur die statische Drossel wirkt, so dass ein abfließender Fluidstrom 3.1 durch eine als Bohrung in das als federelastische Scheibe ausgeführte Drosselelement 30 eingebrachte zweite Öffnung 36 bestimmt wird. Fig. 3 zeigt die Kolbenpumpe 1 bei einem Differenzdruck, der höher als der vorgegebene Grenzdruckwert ist, so dass der äußere Rand des als federelastische Scheibe ausgeführten Drosselelements 30 vom dritten Auflager abgehoben ist und nur noch der innere Rand des als federelastische Scheibe ausgeführten Drosselelements am ersten und zweiten Auflager anliegt. In diesem Zustand wirkt die dynamische Drossel, so dass das als federelastische Scheibe ausgeführte Drosselelement von einem weiteren Fluidstrom 3.2 umströmt wird, welcher mit dem durch die zweite Öffnung 36 fließenden Fluidstrom 3.1 einen abfließenden Gesamtfluidstrom 3 bildet. Im Deckel 10 ist ein Ringkanal 12 ausgebildet, welcher vom Drosselelement 30 abgedeckt ist. Das Fluid gelangt bei geöffnetem Auslassventil 5, d.h. bei aus dem Auslassventilsitz 5.2 abgehobenem Schließkörper 5.1, über einen Verbindungskanal 14 in den Ringkanal 58 und fließt über das Drosselelement 30 in mindestens einen Abströmkanal 7 ab.How out 1 to 5 it can also be seen that a deformation movement ds1 of the throttle element 30 designed as a spring-elastic disk is limited by a corresponding shaping of an end face 22 of the cylinder 20. In the exemplary embodiment shown, the end face 22 is curved, the dimensions of the curvature specifying the maximum possible deformation movement of the throttle element 30 designed as a spring-elastic disk. Fig. 2 shows the piston pump 1 at a differential pressure which is lower than a predetermined limit pressure value, so that the throttle element designed as a spring-elastic disk rests on all supports and only the static throttle acts, so that a flowing fluid flow 3.1 through a hole in the as a spring-elastic disk throttle element 30 introduced second opening 36 is determined. Fig. 3 shows the piston pump 1 at a differential pressure that is higher than the predetermined limit pressure value, so that the outer edge of the throttle element 30 designed as a spring-elastic disc is lifted off the third support and only the inner edge of the throttle element designed as a spring-elastic disc on the first and second supports is applied. In this state, the dynamic throttle acts, so that a further fluid flow 3.2 flows around the throttle element, which is designed as a spring-elastic disk, and which forms an outflowing total fluid flow 3 with the fluid flow 3.1 flowing through the second opening 36. An annular channel 12 is formed in the cover 10 and is covered by the throttle element 30. The fluid arrives when the outlet valve 5 is open, ie when it comes out of the outlet valve seat 5.2 lifted closing body 5.1, via a connecting channel 14 into the ring channel 58 and flows through the throttle element 30 into at least one outflow channel 7.

Wie aus Fig. 6 bis 9 weiter ersichtlich ist, sind im Deckel 10 erfindungsgemäß Zentriermittel 18 vorhanden, welche eine Vorzentrierung des Drosselelements 30 im Deckel 10 bewirken. Im dargestellten Ausführungsbeispiel sind im Deckel 10 sechs Pressstege 16 ausgebildet, an welchen der Zylinder 20 mit dem Deckel 10 verpresst werden kann. Zwischen zwei Pressstegen 16 ist jeweils eine Aussparung 17 ausgebildet, welche bei eingepresstem Zylinder 20 als Abströmkanäle 7 für die Fluidströmung 3 wirken. Im dargestellten Ausführungsbeispiel weist der Deckel 10 der Kolbenpumpe 1 sechs Aussparungen 18 und die Kolbenpumpe 1 somit sechs Abströmkanäle 7 auf.How out 6 to 9 It can also be seen that centering means 18 are present in the cover 10 according to the invention, which cause the throttle element 30 to be pre-centered in the cover 10. In the exemplary embodiment shown, six press webs 16 are formed in the cover 10, on which the cylinder 20 can be pressed with the cover 10. A recess 17 is formed between each of two press bars 16, which act as outflow channels 7 for the fluid flow 3 when the cylinder 20 is pressed in. In the exemplary embodiment shown, the cover 10 of the piston pump 1 has six cutouts 18 and the piston pump 1 thus has six outflow channels 7.

Wie aus Fig. 6 bis 9 weiter ersichtlich ist, umfassen die Zentriermittel 18 mindestens eine Fase, welche jeweils in Anpressrichtung hintenliegend am Presssteg 16 angeordnet ist. Im dargestellten Ausführungsbeispiel umfassen die Zentriermittel 18 sechs Fasen. Wie aus Fig. 9 ersichtlich ist, weisen die einzelnen Fasen 18 jeweils einen spitzen Winkel α auf, der vorzugsweise größer als 60° ist, um ein Verklemmen des als federelastische Scheibe ausgeführten Drosselelements 30 zu verhindern.How out 6 to 9 can also be seen, the centering means 18 comprise at least one chamfer, which is arranged on the back of the pressing web 16 in the pressing direction. In the illustrated embodiment, the centering means 18 comprise six chamfers. How out Fig. 9 it can be seen, the individual bevels 18 each have an acute angle α, which is preferably greater than 60 °, in order to prevent jamming of the throttle element 30, which is designed as a spring-elastic disk.

Gemäß dem erfindungsgemäßen Verfahren zur Montage einer Kolbenpumpe, wird das Drosselelement 30 als federelastische Scheibe ausgeführt und in den Deckel 10 eingebracht. Durch die im Deckel 10 angeordneten Zentriermittel 18 wird eine Vorzentrierung des Drosselelements 30 im Deckel 10 bewirkt, und das Zylinderelement 20 kann nach dem Einbringen und der Vorzentrierung des Drosselelements 30 in den Deckel 10 eingepresst werden, ohne das als federelastische Scheibe ausgeführte Drosselelement 30 zu verformen bzw. zu beschädigen. An der Auslassöffnung 26 des Zylinders 20 sind zweite Zentriermittel 28 vorgesehen, die als an die erste Öffnung 34 im Drosselelement 30 angepasster umlaufender Kragen ausgeführt sind und eine abschließenden Zentrierung des Drosselelements 30 bewirken.According to the method according to the invention for assembling a piston pump, the throttle element 30 is designed as a spring-elastic disk and is introduced into the cover 10. The centering means 18 arranged in the cover 10 causes the throttle element 30 to be pre-centered in the cover 10, and the cylinder element 20 can be pressed into the cover 10 after the throttle element 30 has been introduced and pre-centered, without deforming the throttle element 30, which is designed as a spring-elastic disc or damage. At the outlet opening 26 of the cylinder 20, second centering means 28 are provided, which are designed as a circumferential collar adapted to the first opening 34 in the throttle element 30 and bring about a final centering of the throttle element 30.

Ausführungsformen der vorliegenden Erfindung ermöglichen in vorteilhafter Weise eine kostenneutrale Vorzentrierung des Drosselelements im Deckel der Kolbenpumpe. Embodiments of the present invention advantageously enable a cost-neutral pre-centering of the throttle element in the cover of the piston pump.

Claims (8)

  1. Piston pump for conveying fluids, which piston pump comprises a cylinder (20), a piston which is mounted movably in the cylinder (20), and a pressure space (24) which is arranged between an inlet valve and an outlet valve (5) and is closed by a cover (10), a throttle element (30) for throttling the fluid stream (3) being provided downstream of the outlet valve (5) in the fluid stream (3), the throttle element (30) being configured as a resilient disc which is introduced into the cover (10), and there being means (18) for pre-centring the throttle element (30) in the cover (10), characterized in that at least two pressing webs (16) are configured on the cover (10), on which pressing webs (16) the cylinder (20) is pressed with the cover (10), the centring means (18) comprising at least one bevel which is arranged on the respective pressing web (16) so as to lie at the rear in the pressing-on direction, and at least one cut-out (17) which is configured between two pressing webs (16) acting as an outflow channel (7) for the fluid stream (3).
  2. Piston pump according to Claim 1, characterized in that the individual bevels (18) in each case have an acute angle (α).
  3. Piston pump according to Claim 1 or 2, characterized in that an annular channel (12) is configured in the cover (10), which annular channel (12) is covered by the throttle element (30) and is filled with fluid in the case of an open outlet valve (5), which fluid flows out via the throttle element (30) into at least one outflow channel (7).
  4. Piston pump according to one of Claims 1 to 3, characterized in that the throttle element (30) which is configured as a resilient disc is arranged between the cylinder (20) and the cover (10) and sets the flow cross section in a variable manner in the at least one outflow channel (7) in a manner which is dependent on the pressure difference between its upper side (32.1) and its lower side (32.2).
  5. Piston pump according to one of Claims 1 to 4, characterized in that a deformation movement (ds1) of the throttle element (30) which is configured as a resilient disc is limited by way of shaping of an end face (22) of the cylinder (20).
  6. Piston pump according to one of Claims 1 to 5, characterized in that the throttle element (30) which is configured as a resilient disc has a first opening (34), through which flow can pass, flow passing through the first opening (34) and/or flowing around the throttle element (30) which is configured as a resilient disc in the case of a lifted-up position of the throttle element (30) which is configured as a resilient disc.
  7. Piston pump according to Claim 6, characterized in that there is a second opening (36) which is released independently of the differential pressure with a defined constant flow cross section, the second opening (36) being made as a bore in the throttle element (30) which is configured as a resilient disc and/or as a depression in rests and/or being configured as an annular gap.
  8. Method for assembling a piston pump which comprises a cylinder (20), a piston which is mounted movably in the cylinder (20), and a pressure space (24) which is arranged between an inlet valve and an outlet valve (5) and is closed by a cover (10), a throttle element (30) for throttling the fluid stream (3) being provided downstream of the outlet valve (5) in the fluid stream (3), the throttle element (30) being configured as a resilient disc and being introduced into the cover (10), centring means (18) which are arranged in the cover (10) bringing about pre-centring of the throttle element (30) in the cover (10), characterized in that the cylinder element (20) is pressed into the cover (10) after the throttle element (30) has been introduced and precentred, the cylinder element (20) being pressed with at least two pressing webs (16) which are configured on the cover (10), the centring means (18) comprising at least one bevel which is arranged on the pressing web (16) so as to lie at the rear in the pressing-on direction, and at least one cut-out (17) which is configured between two pressing webs (16) acting as an outflow channel (7) for the fluid stream (3).
EP12724970.4A 2011-07-27 2012-05-29 Piston pump for delivering fluids, and corresponding assembly process for a piston pump Active EP2737208B1 (en)

Applications Claiming Priority (2)

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DE102011079876A DE102011079876A1 (en) 2011-07-27 2011-07-27 Piston pump for conveying fluids and corresponding assembly method for a piston pump
PCT/EP2012/060043 WO2013013865A1 (en) 2011-07-27 2012-05-29 Piston pump for delivering fluids, and corresponding assembly process for a piston pump

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EP2737208A1 EP2737208A1 (en) 2014-06-04
EP2737208B1 true EP2737208B1 (en) 2020-01-01

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US (1) US9556859B2 (en)
EP (1) EP2737208B1 (en)
JP (1) JP6014135B2 (en)
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DE102013224516A1 (en) 2013-11-29 2015-06-03 Robert Bosch Gmbh Arrangement for throttling a fluid flow
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EP2737208A1 (en) 2014-06-04
US20140147314A1 (en) 2014-05-29
US9556859B2 (en) 2017-01-31
JP6014135B2 (en) 2016-10-25
WO2013013865A1 (en) 2013-01-31
DE102011079876A1 (en) 2013-01-31
JP2014523504A (en) 2014-09-11

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