EP2655882A1 - Pump having a throttle - Google Patents

Pump having a throttle

Info

Publication number
EP2655882A1
EP2655882A1 EP11778826.5A EP11778826A EP2655882A1 EP 2655882 A1 EP2655882 A1 EP 2655882A1 EP 11778826 A EP11778826 A EP 11778826A EP 2655882 A1 EP2655882 A1 EP 2655882A1
Authority
EP
European Patent Office
Prior art keywords
pump
spring element
outflow channel
throttle
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11778826.5A
Other languages
German (de)
French (fr)
Inventor
Horst Beling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2655882A1 publication Critical patent/EP2655882A1/en
Withdrawn legal-status Critical Current

Links

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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • 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
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing

Definitions

  • the invention relates to a pump having an outflow channel for discharging fluid from the pump whose passage area is determined by a throttle.
  • a throttle is often arranged in the outflow or outflow.
  • the throttle is intended to reduce the effect of pressure pulsations in the pump on the subsequent hydraulic system and in particular to reduce the noise of the pump.
  • noise reduction such chokes are known with fixed passage area.
  • Typical pumps for automotive brake systems comprise a cylinder in which a piston is slidably mounted. When moving the piston promotes a fluid in the form of brake fluid in the discharge channel of the pump.
  • a pump is provided with an outflow channel for discharging fluid from the pump, whose passage area is determined by a throttle.
  • the throttle is designed with a passage area of the outflow channel changing in size spring element.
  • the passage area of the throttle is made variable at an outflow channel of a pump.
  • the throttle effect can be adapted to the operating situation of the pump.
  • the variation of the size of the passage area is created in a particularly simple and cost-producible manner by means of a deflectable spring element.
  • the spring element is loaded by the hydraulic pressure generated by the pump and deviates correspondingly. With the retreat, the spring element increases at the same time the passage area, so that the throttle effect decreases.
  • the throttle effect is reduced at high flow rate of the pump, whereas the throttling effect is stronger at low flow rate.
  • the passage area of the pump is designed with a non-closable by the spring element bypass surface.
  • the bypass surface forms an always permeable passage area or cross-sectional area in the discharge channel. It thereby ensures a minimum outflow from the pump.
  • the bypass surface is preferably formed next to the spring element along its direction of movement.
  • the bypass surface is preferably designed as a gap, slot or the like next to the spring element. This gap is not closed and can therefore always be flowed through freely. Furthermore, the gap serves as tolerance compensation with regard to the dimensional tolerances of the width of the spring element and the width of the outflow channel. As a result, the assembly of the spring element in the discharge channel is easier.
  • the spring element is designed with a leaf spring in the pump.
  • the spring element in the outflow channel can be arranged particularly easily and positioned in a fixed manner. Furthermore, there is only a small space requirement for the leaf spring.
  • a plate spring can be selected as a spring element.
  • a diaphragm spring allows a large range of variation in terms of the size of the passage area with largely closed and largely open Mandarinskyse.
  • the leaf spring is preferably configured and arranged such that it protrudes arcuately into the outflow channel. The curved shape of the leaf spring can then be targeted by the fluid flowing through the discharge channel, whereby turbulence formation can be minimized. Such a flowed leaf spring thus deviates back defined due to the pressure force of the flow.
  • the size of the passage area and thus the throttle effect is precisely changed in this way. Thus, a defined flow situation can be generated on the spring element, which leads to a correspondingly defined throttle behavior of the variable throttle according to the invention.
  • the leaf spring is furthermore preferably located with at least one section on a wall of the outflow channel and is rounded at this section.
  • the thus configured leaf spring can be positioned by simply inserting or applying in the interior of the discharge channel.
  • the at least one rounded portion reduces the friction of such a leaf spring applied to the wall of the outflow channel. Consequently, the bending behavior of the leaf spring is improved when it is pushed back by the pressure force of the inflowing hydraulic fluid and thereby deformed.
  • At least one shoulder is preferably formed, with which the spring element is positioned in the longitudinal direction of the outflow channel.
  • the shoulder prevents migration of the spring element along the Ausströmkanals.
  • a pump cover is provided on the pump, which acts as a particular disc-shaped cover member for the cylinder of the pump and has a cylinder facing end face.
  • the outflow channel is formed with the spring element disposed therein end face.
  • the spring element is laterally easy to install or to install.
  • the frontal tig formed outflow to a closed channel shape or tube shape are designed.
  • the pump is formed along a cylinder axis and the outflow channel aligned with the spring element arranged therein radially to the cylinder axis.
  • the described pump is used in a motor vehicle brake system.
  • the inventively achieved, variable throttle effect is particularly advantageous for use in motor vehicle systems and the targeted there noise reduction.
  • Fig. 1 is a longitudinal section of a pump according to the invention.
  • Fig. 2 shows the section II - II of FIG. 1 in an enlarged view.
  • a pump 10 is illustrated, in which in a substantially block-shaped housing 1 1, a first piston member 12 and a second piston member 13 are slidably mounted.
  • the piston elements 12 and 13 are coupled to one another in a force-transmitting manner, in particular connected on the front side, and are driven by means of a drive 14 in the form of an eccentric.
  • the piston member 13 is biased against the drive 14 with a spring 16 in the form of a helical spring.
  • the spring 16 is arranged in a delivery chamber 18 which is surrounded by a cylinder 19. In the cylinder 19, the piston member 13 slides fluid-tight along.
  • An inlet 20 is fluidly connected to an inlet port 28 formed centrally in the piston member 13 with respect to the longitudinal axis of the assembly.
  • This inlet opening 28 is part of an inlet valve 22 and, as such, cooperates with a closure body 24 to selectively allow brake fluid to flow into the delivery space 18.
  • the inlet valve 22 is designed as a check valve, the closure body 24 being in the form of a ball. is formed, which is biased by a spring 26 against the inlet opening 28.
  • an outlet opening 36 is located centrally on an end face of the cylinder 19 facing away from the inlet opening 28.
  • This outlet opening 36 is part of an outlet valve 30 and interacts with a spherical closure body 32.
  • the closure body 32 is biased by a spring 34 against the outlet opening 36.
  • the outlet valve 30 is thus also designed as a check valve.
  • a pump cover 37 is arranged behind the outlet opening 28 (and thus outside of the delivery chamber 18) on the front side of the cylinder 19.
  • the pump cover 37 is placed on the front end of the cylinder 19 and supports the spring 34 from. Further, the pump cover 37 optionally provides sufficient space for a reservoir or damper (not shown).
  • an outflow 38 formed, in particular milled, which leads to an outlet 40 on the housing 1 1.
  • a throttle spring element 42 is arranged in the form of a leaf spring.
  • the leaf spring is shaped in such a way that in its rest position it essentially closes off the outflow channel 38 and can be deformed by an influx with escaping brake fluid in order then to provide an enlarged passage area in the outflow channel 38 in comparison to the rest position.
  • the leaf spring has an overall arc-shaped cross-sectional shape (see FIG. 1) and is provided at its end regions with in each case an oppositely curved or rounded section 46.
  • the sections 46 lie against one of the walls of the outflow channel 38, which are formed by the pump cover 37 at.
  • the leaf spring is thus similar to a Greek Omega ( ⁇ ) bent.
  • the bent portions 46 reduce the friction of the leaf spring at the bearing or contact surfaces in the discharge channel 38th
  • the width (measured in the circumferential direction of the pump cover 37) of the leaf spring is adapted to the width of the outflow channel 38, that on both sides of the Leaf spring a gap 54 remains.
  • the gaps 54 thus extend along the direction of movement of the spring element 42 and form a bypass line or a minimum passage area for the outflow channel 38, with which a resistance-free minimum outflow from the pump 10 is ensured. Furthermore, the gaps 54 serve as tolerance compensation with regard to the width dimensions mentioned.
  • a shoulder 44 is formed as a kind of stage in the outflow channel. At this shoulder 44 is located on a portion 46 of the spring element 42, which prevents the spring element 42 could migrate radially or slip. In particular, it is prevented that the spring element 42 could migrate (due to pressure pulsations in the outflow channel 44) in the direction of the outlet valve 30.
  • the outflow channel 38 is divided from the inside to the outside into a first, radial section 48, a second, radial section 50 and a third, axial section 52.
  • the shoulder 44 is formed in the section 48 and the spring element 42 in the section 50.
  • the transition from the section 50 to the section 52 is L-shaped, whereby the spring element 42 is retained in the direction of the outlet 40.
  • the portion 48 is designed slightly longer than the leaf spring, so that this finds sufficient space for their bending movement.
  • variable throttle created by the spring element 42 When a pumping action, triggered by the drive 14 which pushes the coupled piston elements 12 and 13 into the delivery chamber 18, takes place, fluid is forced under pressure through the outlet valve 30 pushed in the outflow channel 38.
  • the fluid can flow through the gaps 54 through the outflow channel 38.
  • a dynamic pressure builds up in front of the spring element 42, which results in that the spring element 42 is moved from its rest position into a deformed position. In this deformed position, the spring element 42 is less curved, ie bent back. It then no longer largely obstructs the outflow channel 38, but instead releases an enlarged passage area through which fluid can reach the outlet 40.
  • the spring element 42 is thus deformed as soon as a larger amount of fluid is conveyed out of the partial region 48 of the outflow channel 38.
  • the deformation begins only from a certain pressure value or from a certain force which exerts the fluid on the spring element 42. It increases the flow cross-section through the discharge channel 38, which was previously largely closed.
  • the throttle thus regulates the flow of the fluid through the discharge channel 38 as a function of the delivery rate of the pump 10.
  • the spring element 42 can be produced inexpensively as a simple sheet metal bent part by means of stamping. In addition, only a small footprint for the spring element 42 is necessary. In principle, only one outflow channel 38 with an associated variable throttle is necessary. However, it is also possible for a plurality of such outflow channels to be distributed, in particular distributed on the circumference of the pump cover 37.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to a pump (10) having an outflow channel (38) for discharging fluid out of the pump (10), the outlet area thereof being determined by a throttle, wherein the throttle is designed having a spring element (42) which changes the size of the outlet area of the outflow channel (38).

Description

Beschreibung  description
Titel title
Pumpe mit einer Drossel Stand der Technik  Pump with a throttle prior art
Die Erfindung betrifft eine Pumpe mit einem Ausströmkanal zum Abführen von Fluid aus der Pumpe, dessen Durchlassfläche von einer Drossel bestimmt ist. The invention relates to a pump having an outflow channel for discharging fluid from the pump whose passage area is determined by a throttle.
Bei Pumpen, insbesondere bei Kolbenpumpen mit pulsierender hydraulischer Druckerzeugung und vor allem bei Pumpen zur Verwendung in Kraftfahrzeugbremsanlagen, wird in deren Ausströmkanal bzw. Abströmkanal oftmals eine Drossel angeordnet. Die Drossel soll die Auswirkung von in der Pumpe entstehenden Druckpulsationen auf das nachfolgende hydraulische System vermindern und insbesondere die Geräuschentwicklung der Pumpe reduzieren. Als kostengünstiges Mittel der Geräuschreduzierung sind solche Drosseln mit fester Durchlassfläche bekannt. In pumps, especially in piston pumps with pulsating hydraulic pressure generation and especially in pumps for use in motor vehicle brake systems, a throttle is often arranged in the outflow or outflow. The throttle is intended to reduce the effect of pressure pulsations in the pump on the subsequent hydraulic system and in particular to reduce the noise of the pump. As a cost-effective means of noise reduction such chokes are known with fixed passage area.
Typische Pumpen für Kraftfahrzeugbremsanlagen umfassen einen Zylinder, in dem ein Kolben verschiebbar gelagert ist. Beim Verschieben fördert der Kolben ein Fluid in Gestalt von Bremsflüssigkeit in den Ausströmkanal der Pumpe. Typical pumps for automotive brake systems comprise a cylinder in which a piston is slidably mounted. When moving the piston promotes a fluid in the form of brake fluid in the discharge channel of the pump.
Offenbarung der Erfindung Disclosure of the invention
Erfindungsgemäß ist eine Pumpe mit einem Ausströmkanal zum Abführen von Fluid aus der Pumpe geschaffen, dessen Durchlassfläche von einer Drossel bestimmt ist. Die Drossel ist mit einem die Durchlassfläche des Ausströmkanals in ihrer Größe verändernden Federelement gestaltet. According to the invention, a pump is provided with an outflow channel for discharging fluid from the pump, whose passage area is determined by a throttle. The throttle is designed with a passage area of the outflow channel changing in size spring element.
Erfindungsgemäß ist die Durchlassfläche der Drossel an einem Ausströmkanal einer Pumpe variabel gestaltet. Mit der Variation bzw. Veränderung der Größe der Durchlassfläche kann die Drosselwirkung an die Betriebssituation der Pumpe angepasst werden. Die Variation der Größe der Durchlassfläche wird auf besonders einfache und kostengünstig herstellbare Weise mittels eines auslenkbaren Federelements geschaffen. Das Federelement wird von dem von der Pumpe erzeugten Hydraulikdruck belastet und weicht entsprechend zurück. Mit dem Zurückweichen vergrößert das Federelement zugleich die Durchlassfläche, so dass die Drosselwirkung abnimmt. Damit wird die Drosselwirkung bei hoher Förderleistung der Pumpe reduziert, wohingegen die Drosselwirkung bei geringer Förderleistung stärker ist. According to the invention, the passage area of the throttle is made variable at an outflow channel of a pump. With the variation or change of size the passage area, the throttle effect can be adapted to the operating situation of the pump. The variation of the size of the passage area is created in a particularly simple and cost-producible manner by means of a deflectable spring element. The spring element is loaded by the hydraulic pressure generated by the pump and deviates correspondingly. With the retreat, the spring element increases at the same time the passage area, so that the throttle effect decreases. Thus, the throttle effect is reduced at high flow rate of the pump, whereas the throttling effect is stronger at low flow rate.
Bei bekannten fest vorgegebenen Drosselquerschnitten wird hingegen bei hoher Förderleistung der Pumpe zu stark gedrosselt und bei niedriger Förderleistung zu wenig. In known fixed throttle cross-sections, however, at high flow rate of the pump is throttled too much and at low flow too little.
Vorzugsweise ist die Durchlassfläche der Pumpe mit einer von dem Federelement nicht verschließbaren Bypassfläche gestaltet. Die Bypassfläche bildet eine immer durchströmbare Durchlassfläche bzw. Querschnittfläche im Ausströmkanal. Sie stellt dadurch eine Mindestausströmung aus der Pumpe sicher. Preferably, the passage area of the pump is designed with a non-closable by the spring element bypass surface. The bypass surface forms an always permeable passage area or cross-sectional area in the discharge channel. It thereby ensures a minimum outflow from the pump.
Die Bypassfläche ist bevorzugt neben dem Federelement längs dessen Bewegungsrichtung ausgebildet. Dabei ist die Bypassfläche vorzugsweise als Spalt, Schlitz oder dergleichen neben dem Federelement gestaltet. Dieser Spalt ist nicht verschlossen und kann damit immer frei durchströmt werden. Ferner dient der Spalt als Toleranzausgleich im Hinblick auf die Maßtoleranzen der Breite des Federelements und der Breite des Ausströmkanals. Dadurch wird auch die Montage des Federelements im Ausströmkanal einfacher. The bypass surface is preferably formed next to the spring element along its direction of movement. In this case, the bypass surface is preferably designed as a gap, slot or the like next to the spring element. This gap is not closed and can therefore always be flowed through freely. Furthermore, the gap serves as tolerance compensation with regard to the dimensional tolerances of the width of the spring element and the width of the outflow channel. As a result, the assembly of the spring element in the discharge channel is easier.
Bevorzugt ist bei der Pumpe das Federelement mit einer Blattfeder gestaltet. Derart gestaltet lässt sich das Federelement im Ausströmkanal besonders einfach anordnen und ortsfest positionieren. Ferner besteht für die Blattfeder nur ein geringer Bauraumbedarf. Preferably, the spring element is designed with a leaf spring in the pump. In this way, the spring element in the outflow channel can be arranged particularly easily and positioned in a fixed manner. Furthermore, there is only a small space requirement for the leaf spring.
Alternativ kann eine Tellerfeder als Federelement gewählt werden. Eine Tellerfeder ermöglicht einen großen Variationsbereich hinsichtlich der Größe der Durchlassfläche bei weitgehend geschlossenem und bei weitgehend offenem Durchläse. Die Blattfeder ist bevorzugt so ausgestaltet und angeordnet, dass sie bogenförmig in den Ausströmkanal hineinragt. Die Bogenform der Blattfeder kann dann von dem durch den Ausströmkanal strömenden Fluid gezielt angeströmt werden, wodurch ein Bilden von Turbulenzen gering gehalten werden kann. Eine derart angeströmte Blattfeder weicht also aufgrund der Druckkraft der Anströmung definiert zurück. Die Größe der Durchlassfläche und damit der Drosselwirkung wird auf diese Weise präzise verändert. Es kann also eine definierte Strömungssituation am Federelement erzeugt werden, was zu einem entsprechend definierten Drosselverhalten der erfindungsgemäß variablen Drossel führt. Alternatively, a plate spring can be selected as a spring element. A diaphragm spring allows a large range of variation in terms of the size of the passage area with largely closed and largely open Durchläse. The leaf spring is preferably configured and arranged such that it protrudes arcuately into the outflow channel. The curved shape of the leaf spring can then be targeted by the fluid flowing through the discharge channel, whereby turbulence formation can be minimized. Such a flowed leaf spring thus deviates back defined due to the pressure force of the flow. The size of the passage area and thus the throttle effect is precisely changed in this way. Thus, a defined flow situation can be generated on the spring element, which leads to a correspondingly defined throttle behavior of the variable throttle according to the invention.
Die Blattfeder liegt ferner bevorzugt mit mindestens einem Abschnitt an einer Wandung des Ausströmkanals an und ist an diesem Abschnitt gerundet gestaltet. Die derart gestaltete Blattfeder kann durch einfaches Einlegen bzw. Anlegen im Inneren des Ausströmkanals positioniert werden. Der mindestens eine gerundete Abschnitt reduziert die Reibung einer derart an die Wandung des Ausströmkanals angelegten Blattfeder. Folglich wird das Biegeverhalten der Blattfeder verbessert, wenn diese von der Druckkraft des anströmenden Hydraulikfluids zurückgedrängt und dabei verformt wird. The leaf spring is furthermore preferably located with at least one section on a wall of the outflow channel and is rounded at this section. The thus configured leaf spring can be positioned by simply inserting or applying in the interior of the discharge channel. The at least one rounded portion reduces the friction of such a leaf spring applied to the wall of the outflow channel. Consequently, the bending behavior of the leaf spring is improved when it is pushed back by the pressure force of the inflowing hydraulic fluid and thereby deformed.
In dem Ausströmkanal ist vorzugsweise mindestens ein Absatz ausgebildet, mit dem das Federelement in Längsrichtung des Ausströmkanals positioniert ist. Der Absatz verhindert ein Wandern des Federelements entlang des Ausströmkanals. Derart gestaltet wird eine einfache und zugleich genaue Positionierung des Federelements im Ausströmkanal ermöglicht. In the outflow channel, at least one shoulder is preferably formed, with which the spring element is positioned in the longitudinal direction of the outflow channel. The shoulder prevents migration of the spring element along the Ausströmkanals. Such a design enables a simple and accurate positioning of the spring element in the outflow channel.
Bevorzugt ist an der Pumpe ein Pumpendeckel vorgesehen, der als ein insbesondere scheibenförmiges Deckelelement für den Zylinder der Pumpe wirkt und eine zum Zylinder gewandte Stirnseite aufweist. In dem Pumpendeckel ist der Ausströmkanal mit dem darin angeordneten Federelement stirnseitig ausgebildet ist. Ein derart in einem Deckelelement stirnseitig ausgebildeter Ausströmkanal, und insbesondere auch ein dabei im Ausströmkanal ausgebildeter Absatz für die Positionierung des Federelements, kann besonders einfach und kostengünstig hergestellt werden. In dem stirnseitigen Ausströmkanal ist das Federelement seitlich einfach Einzusetzen bzw. Einzubauen. In Zusammenwirkung mit einem weiteren Bauteil der Pumpe, insbesondere dem Zylinder, kann der derart stirnsei- tig ausgeformte Ausströmkanal zu einer geschlossenen Kanalform bzw. Rohrform gestaltet werden. Preferably, a pump cover is provided on the pump, which acts as a particular disc-shaped cover member for the cylinder of the pump and has a cylinder facing end face. In the pump cover the outflow channel is formed with the spring element disposed therein end face. Such in a cover element end face formed discharge channel, and in particular a case in the outflow formed paragraph for the positioning of the spring element, can be made particularly simple and inexpensive. In the end-side outflow channel, the spring element is laterally easy to install or to install. In cooperation with a further component of the pump, in particular the cylinder, the frontal tig formed outflow to a closed channel shape or tube shape are designed.
Vorteilhaft ist die Pumpe längs einer Zylinderachse ausgebildet und der Ausströmkanal mit dem darin angeordneten Federelement radial zur Zylinderachse ausgerichtet. Mit dem derartrigen radialen Strömungsweg aus dem Zentrum der Pumpe heraus, hin zu deren Außenseite ist eine insgesamt sehr platzsparende und damit bauraumoptimierte Lösung gestaltet. Advantageously, the pump is formed along a cylinder axis and the outflow channel aligned with the spring element arranged therein radially to the cylinder axis. With the derartrigen radial flow path out of the center of the pump, towards the outside of an overall very space-saving and thus space-optimized solution is designed.
Vorzugsweise wird die beschriebene Pumpe in einer Kraftfahrzeugbremsanlage verwendet. Die erfindungsgemäß erzielte, variable Drosselwirkung ist insbesondere für den Einsatz bei Kraftfahrzeugbremsanlagen und der dort angestrebten Geräuschreduzierung besonders vorteilhaft. Preferably, the described pump is used in a motor vehicle brake system. The inventively achieved, variable throttle effect is particularly advantageous for use in motor vehicle systems and the targeted there noise reduction.
Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigt: An exemplary embodiment of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. It shows:
Fig. 1 einen Längsschnitt einer erfindungsgemäßen Pumpe, und Fig. 1 is a longitudinal section of a pump according to the invention, and
Fig. 2 den Schnitt II - II gemäß Fig. 1 in vergrößerter Darstellung. Fig. 2 shows the section II - II of FIG. 1 in an enlarged view.
In den Fig. ist eine Pumpe 10 veranschaulicht, bei der in einem im Wesentlichen blockförmigen Gehäuse 1 1 ein erstes Kolbenelement 12 und ein zweites Kolbenelement 13 verschiebbar gelagert sind. Die Kolbenelemente 12 und 13 sind miteinander kraftübertragend gekoppelt, insbesondere stirnseitig verbunden und werden mittels eines Antriebs 14 in Gestalt eines Exzenters angetrieben. Das Kolbenelement 13 ist dabei mit einer Feder 16 in Form einer Schraubenfeder gegen den Antrieb 14 vorgespannt. Die Feder 16 ist in einem Förderraum 18 angeordnet, der von einem Zylinder 19 umgeben ist. In dem Zylinder 19 gleitet das Kolbenelement 13 fluiddichtend entlang. In the Fig. A pump 10 is illustrated, in which in a substantially block-shaped housing 1 1, a first piston member 12 and a second piston member 13 are slidably mounted. The piston elements 12 and 13 are coupled to one another in a force-transmitting manner, in particular connected on the front side, and are driven by means of a drive 14 in the form of an eccentric. The piston member 13 is biased against the drive 14 with a spring 16 in the form of a helical spring. The spring 16 is arranged in a delivery chamber 18 which is surrounded by a cylinder 19. In the cylinder 19, the piston member 13 slides fluid-tight along.
Ein Einlass 20 ist fluidleitend mit einer Einlassöffnung 28 verbunden, die in Bezug auf die Längsachse der Anordnung mittig in dem Kolbenelement 13 ausgebildet ist. Diese Einlassöffnung 28 ist Teil eines Einlassventils 22 und wirkt als solches mit einem Verschlusskörper 24 zusammen, um wahlweise Bremsfluid in den Förderraum 18 einströmen zu lassen. Das Einlassventil 22 ist als Rückschlagventil gestaltet, wobei der Verschlusskörpers 24 in Form einer Kugel aus- gebildet ist, die mittels einer Feder 26 gegen die Einlassöffnung 28 vorgespannt ist. An inlet 20 is fluidly connected to an inlet port 28 formed centrally in the piston member 13 with respect to the longitudinal axis of the assembly. This inlet opening 28 is part of an inlet valve 22 and, as such, cooperates with a closure body 24 to selectively allow brake fluid to flow into the delivery space 18. The inlet valve 22 is designed as a check valve, the closure body 24 being in the form of a ball. is formed, which is biased by a spring 26 against the inlet opening 28.
Ferner befindet sich an einer von der Einlassöffnung 28 abgewandten Stirnseite des Zylinders 19 mittig eine Auslassöffnung 36. Diese Auslassöffnung 36 ist Teil eines Auslassventils 30 und wirkt mit einem kugelförmigen Verschlusskörper 32 zusammen. Der Verschlusskörper 32 ist mittels einer Feder 34 gegen die Auslassöffnung 36 vorgespannt. Das Auslassventil 30 ist damit ebenfalls als Rückschlagventil gestaltet. Furthermore, an outlet opening 36 is located centrally on an end face of the cylinder 19 facing away from the inlet opening 28. This outlet opening 36 is part of an outlet valve 30 and interacts with a spherical closure body 32. The closure body 32 is biased by a spring 34 against the outlet opening 36. The outlet valve 30 is thus also designed as a check valve.
In Strömungsrichtung des ausströmenden Bremsfluids ist hinter der Auslassöffnung 28 (und damit außerhalb des Förderraums 18) an der Stirnseite des Zylinders 19 ein Pumpendeckel 37 angeordnet. Der Pumpendeckel 37 ist auf das Stirnende des Zylinders 19 aufgesetzt und stützt die Feder 34 ab. Ferner stellt der Pumpendeckel 37 gegebenenfalls ausreichend Bauraum für einen Speicher oder Dämpfer (nicht dargestellt) zur Verfügung. In the flow direction of the outflowing brake fluid, a pump cover 37 is arranged behind the outlet opening 28 (and thus outside of the delivery chamber 18) on the front side of the cylinder 19. The pump cover 37 is placed on the front end of the cylinder 19 and supports the spring 34 from. Further, the pump cover 37 optionally provides sufficient space for a reservoir or damper (not shown).
An der zum Zylinder 19 gewandten Stirnseite des Pumpendeckels 37 ist radial aus diesem ein Ausströmkanal 38 ausgeformt, insbesondere ausgefräst, der zu einem Auslass 40 am Gehäuse 1 1 führt. Im Ausströmkanal 38 ist ein als Drossel wirkendes Federelement 42 in Form einer Blattfeder angeordnet. Die Blattfeder ist derart geformt, dass sie in Ihrer Ruhelage den Ausströmkanal 38 im Wesentlichen verschließt und durch ein Anströmen mit ausströmenden Bremsfluid verformt werden kann, um dann eine im Vergleich zur Ruhelage vergrößerte Durchlassfläche im Ausströmkanal 38 bereitzustellen. On the side facing the cylinder 19 front side of the pump cover 37 is radially out of this an outflow 38 formed, in particular milled, which leads to an outlet 40 on the housing 1 1. In the discharge channel 38 acting as a throttle spring element 42 is arranged in the form of a leaf spring. The leaf spring is shaped in such a way that in its rest position it essentially closes off the outflow channel 38 and can be deformed by an influx with escaping brake fluid in order then to provide an enlarged passage area in the outflow channel 38 in comparison to the rest position.
Die Blattfeder weist eine insgesamt bogenförmige Querschnittsform auf (siehe Fig. 1) und ist an ihren Endbereichen mit jeweils einem entgegengesetzt gebogenen bzw. abgerundeten Abschnitt 46 versehen. Die Abschnitte 46 liegen dabei an einer der Wandungen des Ausströmkanals 38, die vom Pumpendeckel 37 gebildet sind, an. Die Blattfeder ist also ähnlich einem griechischen Omega (Ω) gebogen. Die gebogenen Abschnitte 46 verringern die Reibung der Blattfeder an den Auflage- bzw. Anlageflächen im Ausströmkanal 38. The leaf spring has an overall arc-shaped cross-sectional shape (see FIG. 1) and is provided at its end regions with in each case an oppositely curved or rounded section 46. The sections 46 lie against one of the walls of the outflow channel 38, which are formed by the pump cover 37 at. The leaf spring is thus similar to a Greek Omega (Ω) bent. The bent portions 46 reduce the friction of the leaf spring at the bearing or contact surfaces in the discharge channel 38th
Die Breite (in Umfangsrichtung des Pumpendeckels 37 gemessen) der Blattfeder ist so an die Breite des Ausströmkanals 38 angepasst, dass an beiden Seiten der Blattfeder ein Spalt 54 verbleibt. Die Spalte 54 erstrecken sich damit längs der Bewegungsrichtung des Federelements 42 und bilden eine Bypassleitung bzw. eine Mindestdurchlassfläche für den Ausströmkanal 38, mit der eine widerstandfreie Mindestausströmung aus der Pumpe 10 gewährleistet ist. Ferner dienen die Spalte 54 als Toleranzausgleich im Hinblick auf die genannten Breitenmaße. The width (measured in the circumferential direction of the pump cover 37) of the leaf spring is adapted to the width of the outflow channel 38, that on both sides of the Leaf spring a gap 54 remains. The gaps 54 thus extend along the direction of movement of the spring element 42 and form a bypass line or a minimum passage area for the outflow channel 38, with which a resistance-free minimum outflow from the pump 10 is ensured. Furthermore, the gaps 54 serve as tolerance compensation with regard to the width dimensions mentioned.
Ferner ist im Ausströmkanal ein Absatz 44 als eine Art Stufe ausgebildet. An diesem Absatz 44 liegt ein Abschnitt 46 des Federelements 42 an, wodurch verhindert ist, dass das Federelement 42 radial wandern bzw. verrutschen könnte. Insbesondere ist verhindert, dass das Federelement 42 (bedingt durch Druckpulsationen im Ausströmkanal 44) in Richtung des Auslassventils 30 wandern könnte. Der Ausströmkanal 38 ist dabei von innen nach außen in einen ersten, radialen Teilabschnitt 48, einen zweiten, radialen Teilabschnitt 50 und einen dritten, axialen Teilabschnitt 52 aufgeteilt. Der Absatz 44 ist im Teilabschnitt 48 ausgebildet und das Federelement 42 im Teilabschnitt 50. Der Übergang vom Teilabschnitt 50 zum Teilabschnitt 52 ist L-förmig gestaltet, wodurch das Federelement 42 in Richtung zum Auslass 40 rückgehalten ist. Der Teilabschnitt 48 ist geringfügig länger gestaltet, als die Blattfeder, so dass diese ausreichend Raum für ihre Biegebewegung vorfindet. Furthermore, a shoulder 44 is formed as a kind of stage in the outflow channel. At this shoulder 44 is located on a portion 46 of the spring element 42, which prevents the spring element 42 could migrate radially or slip. In particular, it is prevented that the spring element 42 could migrate (due to pressure pulsations in the outflow channel 44) in the direction of the outlet valve 30. The outflow channel 38 is divided from the inside to the outside into a first, radial section 48, a second, radial section 50 and a third, axial section 52. The shoulder 44 is formed in the section 48 and the spring element 42 in the section 50. The transition from the section 50 to the section 52 is L-shaped, whereby the spring element 42 is retained in the direction of the outlet 40. The portion 48 is designed slightly longer than the leaf spring, so that this finds sufficient space for their bending movement.
Im Folgenden wird die Funktionsweise der mit dem Federelement 42 geschaffenen, variablen Drossel erläutert: Wenn ein Pumpvorgang, ausgelöst durch den Antrieb 14, welcher die gekoppelten Kolbenelemente 12 und 13 in den Förderaum 18 hineindrängt, erfolgt, wird Fluid unter Druck durch das Auslassventil 30 in den Ausströmkanal 38 hineingedrängt. The following describes the mode of operation of the variable throttle created by the spring element 42: When a pumping action, triggered by the drive 14 which pushes the coupled piston elements 12 and 13 into the delivery chamber 18, takes place, fluid is forced under pressure through the outlet valve 30 pushed in the outflow channel 38.
Das Fluid kann soweit möglich durch die Spalte 54 durch den Ausströmkanal 38 hindurchströmen. Darüber hinaus baut sich vor dem Federelement 42 ein Staudruck auf, der dazu führt, dass das Federelement 42 aus seiner Ruhelage in eine verformte Stellung bewegt wird. In dieser verformten Stellung, ist das Federelement 42 weniger stark gewölbt geformt, also zurückgebogen. Es versperrt dann nicht mehr weitgehend den Ausströmkanal 38, sondern gibt in diesem eine vergrößerte Durchlassfläche frei, durch die hindurch Fluid zum Auslass 40 gelangen kann. Das Federelement 42 wird also verformt, sobald ein größere Menge an Fluid aus dem Teilbereich 48 des Ausströmkanals 38 herangefördert wird. Die Verformung beginnt erst ab einem bestimmten Druckwert bzw. ab einer bestimmten Kraft, die das Fluid auf das Federelement 42 ausübt. Es vergrößert sich der Strömungsquerschnitt durch den Ausströmkanal 38, welcher vorher großteils verschlossen war. Die Drossel regelt damit den Durchfluss des Fluids durch den Ausströmkanal 38 in Abhängigkeit der Fördermenge der Pumpe 10. As far as possible, the fluid can flow through the gaps 54 through the outflow channel 38. In addition, a dynamic pressure builds up in front of the spring element 42, which results in that the spring element 42 is moved from its rest position into a deformed position. In this deformed position, the spring element 42 is less curved, ie bent back. It then no longer largely obstructs the outflow channel 38, but instead releases an enlarged passage area through which fluid can reach the outlet 40. The spring element 42 is thus deformed as soon as a larger amount of fluid is conveyed out of the partial region 48 of the outflow channel 38. The deformation begins only from a certain pressure value or from a certain force which exerts the fluid on the spring element 42. It increases the flow cross-section through the discharge channel 38, which was previously largely closed. The throttle thus regulates the flow of the fluid through the discharge channel 38 as a function of the delivery rate of the pump 10.
Vorteilhaft an dieser Gestaltung ist, dass das Federelement 42 als einfaches Blechbiegeteil mittels Stanzen kostengünstig hergestellt werden kann. Zudem ist lediglich ein geringer Platzbedarf für das Federelement 42 nötig. Prinzipiell ist nur ein Ausströmkanal 38 mit einer zugehörigen variablen Drossel nötig. Es können aber auch mehrere solcher Ausströmkanäle insbesondere am Umfang des Pumpendeckels 37 verteilt vorgesehen sein. An advantage of this design is that the spring element 42 can be produced inexpensively as a simple sheet metal bent part by means of stamping. In addition, only a small footprint for the spring element 42 is necessary. In principle, only one outflow channel 38 with an associated variable throttle is necessary. However, it is also possible for a plurality of such outflow channels to be distributed, in particular distributed on the circumference of the pump cover 37.

Claims

Ansprüche claims
1. Pumpe (10) mit einem Ausströmkanal (38) zum Abführen von Fluid aus der Pumpe (10), dessen Durchlassfläche von einer Drossel bestimmt ist, dadurch gekennzeichnet, dass die Drossel mit einem die Durchlassfläche des Ausströmkanals (38) in ihrer Größe verändernden Federelement (42) gestaltet ist. A pump (10) having an exhaust passage (38) for discharging fluid from the pump (10) whose passage area is defined by a throttle, characterized in that the throttle varies in size with a passage area of the exhaust passage (38) Spring element (42) is designed.
2. Pumpe nach Anspruch 1 , 2. Pump according to claim 1,
dadurch gekennzeichnet, dass die Durchlassfläche mit einer von dem Federelement (42) nicht verschließbaren Bypassfläche gestaltet ist.  characterized in that the passage area is designed with a by the spring element (42) non-closable bypass surface.
3. Pumpe nach Anspruch 2, 3. Pump according to claim 2,
dadurch gekennzeichnet, dass die Bypassfläche neben dem Federelement (42) längs dessen Bewegungsrichtung ausgebildet ist.  characterized in that the bypass surface is formed adjacent to the spring element (42) along its direction of movement.
4. Pumpe nach einem der Ansprüche 1 bis 3, 4. Pump according to one of claims 1 to 3,
dadurch gekennzeichnet, dass das Federelement (42) mit einer Blattfeder gestaltet ist.  characterized in that the spring element (42) is designed with a leaf spring.
5. Pumpe nach Anspruch 4, 5. Pump according to claim 4,
dadurch gekennzeichnet, dass die Blattfeder bogenförmig in den Ausströmkanal (38) hineinragt.  characterized in that the leaf spring protrudes arcuately into the outflow channel (38).
6. Pumpe nach Anspruch 4 oder 5, 6. Pump according to claim 4 or 5,
dadurch gekennzeichnet, dass die Blattfeder mit mindestens einem Abschnitt (46) an einer Wandung des Ausströmkanals (38) anliegt und an diesem Abschnitt (46) gerundet gestaltet ist.  characterized in that the leaf spring with at least one portion (46) rests against a wall of the outflow channel (38) and is rounded at this portion (46).
7. Pumpe nach einem der Ansprüche 1 bis 6, 7. Pump according to one of claims 1 to 6,
dadurch gekennzeichnet, dass in dem Ausströmkanal (38) mindestens ein Ab- satz (44) ausgebildet ist, mit dem das Federelement (42) in Längsrichtung des Ausströmkanals (38) positioniert ist. characterized in that in the outflow channel (38) at least one Ab- set (44) is formed, with which the spring element (42) in the longitudinal direction of the outflow channel (38) is positioned.
8. Pumpe nach einem der Ansprüche 1 bis 7, 8. Pump according to one of claims 1 to 7,
dadurch gekennzeichnet, dass ein Pumpendeckel (37) vorgesehen ist, in dem der Ausströmkanal (38) mit dem darin angeordneten Federelement (42) stirnseitig ausgebildet ist.  characterized in that a pump cover (37) is provided, in which the outflow channel (38) with the spring element (42) arranged therein is formed frontally.
9. Pumpe nach einem der Ansprüche 1 bis 8, 9. Pump according to one of claims 1 to 8,
dadurch gekennzeichnet, dass die Pumpe (10) längs einer Zylinderachse ausgebildet ist und der Ausströmkanal (38) mit dem darin angeordneten Federelement (42) radial zur Zylinderachse ausgerichtet ist.  characterized in that the pump (10) is formed along a cylinder axis and the outflow channel (38) is aligned with the spring element (42) arranged therein radially to the cylinder axis.
10. Verwendung einer Pumpe (10) nach einem der Ansprüche 1 bis 9 in einer Kraftfahrzeugbremsanlage. 10. Use of a pump (10) according to any one of claims 1 to 9 in a motor vehicle brake system.
EP11778826.5A 2010-12-23 2011-10-24 Pump having a throttle Withdrawn EP2655882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010064114.6A DE102010064114B4 (en) 2010-12-23 2010-12-23 Pump with a throttle
PCT/EP2011/068566 WO2012084307A1 (en) 2010-12-23 2011-10-24 Pump having a throttle

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EP (1) EP2655882A1 (en)
JP (1) JP5786032B2 (en)
CN (1) CN103282654B (en)
DE (1) DE102010064114B4 (en)
WO (1) WO2012084307A1 (en)

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Also Published As

Publication number Publication date
CN103282654A (en) 2013-09-04
JP2014503742A (en) 2014-02-13
US9303639B2 (en) 2016-04-05
CN103282654B (en) 2016-04-13
US20140003982A1 (en) 2014-01-02
JP5786032B2 (en) 2015-09-30
WO2012084307A1 (en) 2012-06-28
DE102010064114B4 (en) 2021-07-29
DE102010064114A1 (en) 2012-06-28

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