EP2539554A1 - Proportional valve, in particular for a camshaft adjuster - Google Patents

Proportional valve, in particular for a camshaft adjuster

Info

Publication number
EP2539554A1
EP2539554A1 EP11701505A EP11701505A EP2539554A1 EP 2539554 A1 EP2539554 A1 EP 2539554A1 EP 11701505 A EP11701505 A EP 11701505A EP 11701505 A EP11701505 A EP 11701505A EP 2539554 A1 EP2539554 A1 EP 2539554A1
Authority
EP
European Patent Office
Prior art keywords
valve
proportional valve
check valve
guide sleeve
piston guide
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.)
Granted
Application number
EP11701505A
Other languages
German (de)
French (fr)
Other versions
EP2539554B1 (en
Inventor
Jens Hoppe
Stefan Konias
Yi Wang
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2539554A1 publication Critical patent/EP2539554A1/en
Application granted granted Critical
Publication of EP2539554B1 publication Critical patent/EP2539554B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • 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
    • Y10T29/49405—Valve or choke making

Definitions

  • the invention relates to a proportional valve with a piston guide sleeve and a valve piston movable in the piston guide sleeve and with a arranged in a pressure medium inlet to the proportional valve check valve and a mounting method for such a proportional valve.
  • Such a proportional valve is known from DE 10 2005 060 1 1 1 A1.
  • This proportional valve is designed for a camshaft adjuster for an internal combustion engine and integrated in a central screw for fastening the camshaft adjuster to a camshaft.
  • the proportional valve to a check valve, which is formed spring-disk-shaped and is arranged in an annular pressure medium inlet laterally adjacent to the proportional valve on the outer circumference of the central screw.
  • check valve is known from EP 1 291 563 A2.
  • This check valve is designed for a particular designed as a cartridge valve proportional valve and integrated into this.
  • this check valve is used in the region of a pressure medium inlet in a recess provided on the inner circumference of the piston guide sleeve prior to assembly of the valve piston.
  • the assembly effort of such in the Kol- ben is required to assembly of the valve piston.
  • the stroke of this formed as a spring ring check valve is not limited to the inside and thus the spring ring can collide with the valve piston. Such a collision can lead to failure of the proportional valve.
  • the invention is based on the object of specifying a proportional valve, in particular for a camshaft adjuster of an internal combustion engine, in which the adaptation of the non-return valve to the proportional valve is improved over the prior art.
  • the check valve is arranged in a ring gap surrounding the piston guide sleeve in the region of the pressure medium inlet.
  • the check valve is on the one hand integrated into the actual proportional valve, so that the check valve does not have to be installed as a separate component during assembly of the proportional valve.
  • the check valve is arranged outside the piston guide sleeve, that the check valve can not be moved radially against the valve piston.
  • the proportional valve thus formed is otherwise preferably used for cam shaft adjustment of an internal combustion engine.
  • the annular gap is delimited by an encapsulation that at least partially surrounds the piston guide sleeve and a receiving sleeve that encompasses at least a portion of the encapsulation.
  • the receiving sleeve at its axial end to a portion of the annular gap forming receiving gap, in which the check valve is used.
  • This embodiment allows a particularly simple and reliable mounting of the check valve by this is introduced without the use of tools in the end-side receiving gap and then the piston guide sleeve is inserted into the receiving sleeve.
  • This refinement also reduces the machining effort on the components, in particular the piston guide sleeve.
  • the piston guide sleeve in the inventive design for the formation of the annular gap is unprocessed.
  • the provided with the encapsulation piston guide sleeve is integrally connected to the receiving sleeve.
  • the non-return valve is inserted into a receiving portion of the annular gap forming a receiving gap of the receiving sleeve and then provided with the encapsulation piston guide sleeve inserted into the receiving sleeve and connected to this, for example, materially.
  • a non-positive or positive connection may be provided.
  • the cohesive connection can be realized for example by ultrasonic welding or gluing.
  • the encapsulation forms on its outer circumferential surface a radially acting in the open position of the check valve stop and the receiving sleeve on its inner lateral surface acting radially in the closing direction of the check valve stop.
  • the check valve In the unactuated state, the check valve is powerless or slightly biased to the inner circumferential surface of the receiving sleeve. If pressure medium fluid, in particular hydraulic fluid, flows radially from the outside into the adjustment space of the proportional valve, then the check valve is pressed by the pressure of the pressure medium fluid against the outer circumferential surface of the extrusion coating and opens the inlet. If pressure oscillations occur opposite to the flow, then the check valve closes against the radial pressure medium inlet of the receiving sleeve.
  • This embodiment offers the advantage that a reliable function is ensured. In any case, it is ensured that a collision of the check valve with the valve piston is excluded.
  • 1 is an overall perspective view of the entire proportional valve for the phaser, a longitudinal section through the proportional valve with the check valve in a closed position, a longitudinal section through the proportional valve with the check valve in an open position and a cross section through the proportional valve with the check valve in a closed position.
  • the proportional valve 1 according to the invention is provided for a camshaft adjuster of an internal combustion engine.
  • the camshaft driven by the camshaft adjuster serves to open the gas exchange valves used for pushing out the combusted gases and sucking in the fresh gases against the force of valve springs mounted on each gas exchange valve.
  • Rigid control times for the gas exchange valves represent a compromise for the design with regard to the achievable mean-pressure maximum or torque maximum and its locations in the usable speed range and the achievable power at rated speed.
  • the actuating piston 6 of the control part 2 displaces the valve piston 3 in a piston guide sleeve 4 of the proportional valve 1 between two end positions and thereby causes a controlled adjustment of the timing on the camshaft adjuster.
  • the proportional valve 1 is in addition to the control part 2 of the piston guide sleeve 4 (see Figures 2 to 4 for detailed illustration), which in the range of a pressure medium inlet 10 and a working port 1 1 b with a Um- injection 5 is provided in particular of a plastic material.
  • the valve piston 3 is displaceable by the actuation part 2 by means of the actuation piston 6 (FIGS. 2 and 3) against the force of a valve spring 7.
  • the provided with the encapsulation 5 piston guide sleeve 4 is inserted into a receiving sleeve 8 and fixed at its end remote from the control part 2 end with this via a snap connection 9 ( Figure 2, 3) accurately positioned.
  • the proportional valve 1 has four hydraulic fluid connections, namely lent a connected to a pump pressure medium inlet 10, two working ports 1 1 a, 1 1 b and connected to a tank return port 1 1 c, which leads through the interior of the hollow cylindrical valve piston 3.
  • the hydraulic fluid which is in particular the engine oil of the internal combustion engine
  • the proportional valve 1 and fed through corresponding passages in the receiving sleeve 8, the encapsulation 5 and depending on the position of the valve piston 3 via a control piston 12a and 12b as part of the valve piston 3 limited annulus 12 to the working ports 1 1 a, 1 1 b out.
  • a defined adjustment of the camshaft is achieved with respect to an example toothed belt-operated or chain-operated drive wheel.
  • This is achieved, for example, by one or more adjusting pistons of the camshaft adjuster 1 which are connected to the camshaft and which are guided through opposing adjusting piston chambers which communicate with the working ports 11a, 11b. are binding, is rotated by imported hydraulic fluid relative to the drive wheel / be.
  • a check valve 13 is inserted in the hydraulic fluid access 10, which in a closed position on the receiving sleeve 8 ( Figure 2) and in an open position on the encapsulation 5 ( Figure 3) is applied.
  • the piston guide sleeve 4, the encapsulation 5 and the receiving sleeve 8 form an annular gap 14 ( Figure 4), in which the check valve 13 is arranged.
  • the receiving sleeve 8 has a nose 15 which cooperates with the encapsulation 5.
  • This nose 15 causes the check valve 13 can not rotate within the annular gap 14. This is a malfunction is excluded. Furthermore, it is ensured by the inventive design that the check valve 13 in the open position with the valve piston 3 can not come into contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention relates to a proportional valve (1), comprising a piston guide sleeve (4) and a valve piston (3) that can be moved in the piston guide sleeve (4), and further comprising a check valve (13) arranged in a pressure medium inlet (10) to the proportional valve (1). According to the invention a proportional valve (1) is provided, in which the adaption of the check valve (13) to the proportional valve (1) is improved with respect to the prior art. This is achieved in that the check valve (13) is arranged in an annular gap (14) surrounding the piston guide sleeve (4) in the region of the pressure medium inlet (10).

Description

Bezeichnung der Erfindung  Name of the invention
Proportionalventil, insbesondere für einen Nockenwellenversteller Beschreibung Proportional valve, in particular for a camshaft adjuster Description
Gebiet der Erfindung Field of the invention
Die Erfindung betrifft ein Proportionalventil mit einer Kolbenführungshülse und einem in der Kolbenführungshülse bewegbaren Ventilkolben sowie mit einem in einem Druckmittelzulauf zu dem Proportionalventil angeordneten Rückschlagventil sowie ein Montageverfahren für ein derartiges Proportionalventil. The invention relates to a proportional valve with a piston guide sleeve and a valve piston movable in the piston guide sleeve and with a arranged in a pressure medium inlet to the proportional valve check valve and a mounting method for such a proportional valve.
Stand der Technik State of the art
Ein derartiges Proportionalventil ist aus der DE 10 2005 060 1 1 1 A1 bekannt. Dieses Proportionalventil ist für einen Nockenwellenversteller für eine Brennkraftmaschine konzipiert und in eine Zentralschraube zur Befestigung des No- ckenwellenverstellers an einer Nockenwelle integriert. Dabei weist das Propor- tionalventil ein Rückschlagventil auf, das federscheibenförmig ausgebildet ist und in einen ringförmigen Druckmittelzulauf seitlich neben dem Proportionalventil am Außenumfang der Zentralschraube angeordnet ist. Bei der Montage muss darauf geachtet werden, dass dieses separat zu dem Proportionalventil angeordnete Rückschlagventil verbaut ist und darüber hinaus besteht zumin- dest beim Einschrauben der das Proportionalventil aufnehmenden Zentralschraube in die Nockenwelle die Gefahr einer Beschädigung. Such a proportional valve is known from DE 10 2005 060 1 1 1 A1. This proportional valve is designed for a camshaft adjuster for an internal combustion engine and integrated in a central screw for fastening the camshaft adjuster to a camshaft. In this case, the proportional valve to a check valve, which is formed spring-disk-shaped and is arranged in an annular pressure medium inlet laterally adjacent to the proportional valve on the outer circumference of the central screw. During assembly, care must be taken to ensure that this check valve, which is separate from the proportional valve, is installed and, moreover, there is a risk of damage at least when the central screw receiving the proportional valve is screwed into the camshaft.
Ein weiteres Rückschlagventil ist aus der EP 1 291 563 A2 bekannt. Dieses Rückschlagventil ist für ein insbesondere als Cartridgeventil ausgebildetes Proportionalventil konzipiert und in dieses integriert. Dabei wird dieses Rückschlagventil im Bereich eines Druckmittelzulaufs in eine am Innenumfang der Kolbenführungshülse vorgesehenen Ausnehmung vor der Montage des Ventilkolbens eingesetzt. Dabei ist der Montageaufwand eines solchen in die Kol- benführungshülse eingesetzten Rückschlagventils erheblich. Hinzu kommt, dass der Hub dieses als Federring ausgebildeten Rückschlagventils nach innen nicht begrenzt ist und der Federring folglich mit dem Ventilkolben kollidieren kann. Eine solche Kollision kann zu einem Ausfall des Proportionalventils führen. Another check valve is known from EP 1 291 563 A2. This check valve is designed for a particular designed as a cartridge valve proportional valve and integrated into this. In this case, this check valve is used in the region of a pressure medium inlet in a recess provided on the inner circumference of the piston guide sleeve prior to assembly of the valve piston. In this case, the assembly effort of such in the Kol- benführungshülse inserted check valve considerably. In addition, the stroke of this formed as a spring ring check valve is not limited to the inside and thus the spring ring can collide with the valve piston. Such a collision can lead to failure of the proportional valve.
Aufgabenstellung task
Der Erfindung liegt die Aufgabe zu Grunde, ein Proportionalventil, insbesonde- re für einen Nockenwellenversteller einer Brennkraftmaschine, anzugeben, bei dem die Adaptierung des Rückschlagventils an das Proportionalventil gegenüber dem Stand der Technik verbessert ist. The invention is based on the object of specifying a proportional valve, in particular for a camshaft adjuster of an internal combustion engine, in which the adaptation of the non-return valve to the proportional valve is improved over the prior art.
Zusammenfassung der Erfindung Summary of the invention
Diese Aufgabe wird dadurch gelöst, dass das Rückschlagventil in einem die Kolbenführungshülse im Bereich des Druckmittelzulaufs umgebenden Ringspalt angeordnet ist. Durch diese Ausgestaltung ist das Rückschlagventil einerseits in das eigentliche Proportionalventil integriert, so dass das Rück- schlagventil bei der Montage des Proportionalventils nicht als separates Bauteil verbaut werden muss. Andererseits ist dadurch, dass das Rückschlagventil außerhalb der Kolbenführungshülse angeordnet ist, sichergestellt, dass das Rückschlagventil nicht radial gegen den Ventilkolben bewegt werden kann. Das so ausgebildete Proportionalventil wird im Übrigen bevorzugt zur Nocken- Wellenverstellung einer Brennkraftmaschine eingesetzt. This object is achieved in that the check valve is arranged in a ring gap surrounding the piston guide sleeve in the region of the pressure medium inlet. By this configuration, the check valve is on the one hand integrated into the actual proportional valve, so that the check valve does not have to be installed as a separate component during assembly of the proportional valve. On the other hand, it is ensured by the fact that the check valve is arranged outside the piston guide sleeve, that the check valve can not be moved radially against the valve piston. The proportional valve thus formed is otherwise preferably used for cam shaft adjustment of an internal combustion engine.
In Weiterbildung der Erfindung ist der Ringspalt von einer die Kolbenführungshülse zumindest teilweise umgebenden Umspritzung und einer zumindest einen Teilbereich der Umspritzung umfassenden Aufnahmehülse begrenzt. Mit dieser Ausgestaltung sind mehrere Vorteile erreicht. Es ist kein zusätzlicher Montageaufwand bei der Montage des Nockenwellenverstellers nötig, wobei dadurch auch die Gefahr von Montagefehlern durch ein falsch oder überhaupt nicht montiertes zusätzliches Rückschlagventil minimiert ist. Weiterhin ist kein zusätzlicher bearbeiteter Bauraum am Zylinderkopf der Brennkraftmaschine für ein separates Rückschlagventil notwendig und es ist eine hydraulisch kurze Entfernung zum eigentlichen Nockenwellenversteller und damit eine steifere hydraulische Abstützung erreicht. In a development of the invention, the annular gap is delimited by an encapsulation that at least partially surrounds the piston guide sleeve and a receiving sleeve that encompasses at least a portion of the encapsulation. With this embodiment, several advantages are achieved. There is no additional installation effort during assembly of the camshaft adjuster necessary, thereby also the risk of assembly errors is minimized by a wrong or not at all mounted additional check valve. Furthermore, no additional machined space on the cylinder head of the engine for a separate check valve necessary and it is a short hydraulic distance to the actual camshaft adjuster and thus achieved a stiffer hydraulic support.
In Weiterbildung der Erfindung weist die Aufnahmehülse an ihrem axialen Ende einen einen Teilbereich des Ringspaltes bildenden Aufnahmespalt auf, in den das Rückschlagventil eingesetzt ist. Diese Ausgestaltung ermöglicht eine besonders einfache und zuverlässige Montage des Rückschlagventils, indem dieses ohne Anwendung von Hilfsmitteln in den endseitigen Aufnahmespalt eingeführt wird und anschließend die Kolbenführungshülse in die Aufnahmehülse eingeführt wird. Durch diese Ausgestaltung ist auch der Bearbeitungsaufwand an den Bauteilen, insbesondere der Kolbenführungshülse reduziert. Im Gegensatz zum Stand der Technik ist die Kolbenführungshülse bei der er- findungsgemäßen Ausgestaltung für die Bildung des Ringspaltes unbearbeitet. In a further development of the invention, the receiving sleeve at its axial end to a portion of the annular gap forming receiving gap, in which the check valve is used. This embodiment allows a particularly simple and reliable mounting of the check valve by this is introduced without the use of tools in the end-side receiving gap and then the piston guide sleeve is inserted into the receiving sleeve. This refinement also reduces the machining effort on the components, in particular the piston guide sleeve. In contrast to the prior art, the piston guide sleeve in the inventive design for the formation of the annular gap is unprocessed.
In weiterer Ausgestaltung der Erfindung ist die mit der Umspritzung versehene Kolbenführungshülse stoffschlüssig mit der Aufnahmehülse verbunden. Dabei wird gemäß einem erfindungsgemäßen Montageverfahren das Rückschlagven- til in einen einen Teilbereich des Ringspalts bildenden Aufnahmespalt der Aufnahmehülse eingesetzt und anschließend die mit der Umspritzung versehene Kolbenführungshülse in die Aufnahmehülse eingeführt und mit dieser beispielsweise stoffschlüssig verbunden. Alternativ dazu kann eine kraft- oder formschlüssige Verbindung vorgesehen sein. Die stoffschlüssige Verbindung kann beispielsweise durch Ultraschallschweißen oder Kleben realisiert sein. Eine kraftschlüssige Verbindung wird beispielsweise durch ein Einpressen der mit der Umspritzung versehenen Kolbenführungshülse in die Aufnahmehülse erreicht, während eine formschlüssige Verbindung durch eine Schnappverbindung realisiert werden kann. Alle diese Ausgestaltungen bieten den Vorteil, dass ein äußerst funktionales Proportionalventil für einen Nockenwellenversteller bereitgestellt ist. In Weiterbildung der Erfindung ist das Rückschlagventil als in axialer Richtung geschlitzte Federhülse ausgebildet, wodurch es wiederum in vorteilhafter Weiterbildung aus einem metallischen Werkstoff, wie beispielsweise Blech oder Edelstahl gefertigt sein kann. In a further embodiment of the invention, the provided with the encapsulation piston guide sleeve is integrally connected to the receiving sleeve. In this case, according to an assembly method according to the invention, the non-return valve is inserted into a receiving portion of the annular gap forming a receiving gap of the receiving sleeve and then provided with the encapsulation piston guide sleeve inserted into the receiving sleeve and connected to this, for example, materially. Alternatively, a non-positive or positive connection may be provided. The cohesive connection can be realized for example by ultrasonic welding or gluing. A frictional connection is achieved, for example, by pressing the piston guide sleeve provided with the extrusion coating into the receiving sleeve, while a positive connection can be achieved by a snap connection. All of these embodiments offer the advantage of providing a highly functional proportional valve for a phaser. In a further development of the invention, the check valve is designed as a slotted spring sleeve in the axial direction, which in turn can be made in an advantageous development of a metallic material, such as sheet metal or stainless steel.
In weiterer Ausgestaltung bildet die Umspritzung an ihrer Außenmantelfläche einen radial in Öffnungsstellung des Rückschlagventils wirkenden Anschlag und die Aufnahmehülse an ihrer Innenmantelfläche einen radial in Schließrichtung des Rückschlagventils wirkenden Anschlag. Im unbetätigten Zustand liegt das Rückschlagventil kraftlos oder leicht vorgespannt an der Innenmantelfläche der Aufnahmehülse an. Strömt Druckmittelfluid, insbesondere Hydraulikfluid, von außen radial in den Verstellraum des Proportionalventils, so wird das Rückschlagventil durch den Druck des Druckmittelfluids gegen die die Außenmantelfläche der Umspritzung gedrückt und öffnet den Zulauf. Treten Druck- Schwingungen entgegengesetzt der Strömung auf, so schließt das Rückschlagventil gegen den radialen Druckmittelzulauf der Aufnahmehülse. Diese Ausgestaltung bietet den Vorteil, dass eine zuverlässige Funktion sichergestellt ist. In jedem Fall ist so sichergestellt, dass eine Kollision des Rückschlagventils mit dem Ventilkolben ausgeschlossen ist. In a further embodiment, the encapsulation forms on its outer circumferential surface a radially acting in the open position of the check valve stop and the receiving sleeve on its inner lateral surface acting radially in the closing direction of the check valve stop. In the unactuated state, the check valve is powerless or slightly biased to the inner circumferential surface of the receiving sleeve. If pressure medium fluid, in particular hydraulic fluid, flows radially from the outside into the adjustment space of the proportional valve, then the check valve is pressed by the pressure of the pressure medium fluid against the outer circumferential surface of the extrusion coating and opens the inlet. If pressure oscillations occur opposite to the flow, then the check valve closes against the radial pressure medium inlet of the receiving sleeve. This embodiment offers the advantage that a reliable function is ensured. In any case, it is ensured that a collision of the check valve with the valve piston is excluded.
Ausführungsbeispiel embodiment
Kurze Beschreibung der Zeichnung Weitere, vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist. BRIEF DESCRIPTION OF THE DRAWING Further advantageous embodiments of the invention can be found in the drawing description in which an embodiment of the invention illustrated in the figures is described in more detail.
Es zeigen: Show it:
Fig .1 eine perspektivische Gesamtansicht des gesamten Proportionalventils für den Nockenwellenversteller, einen Längsschnitt durch das Proportionalventil mit dem Rückschlag ventil in einer geschlossenen Position, einen Längsschnitt durch das Proportionalventil mit dem Rückschlag ventil in einer offenen Position und einen Querschnitt durch das Proportionalventil mit dem Rückschlagventil in einer geschlossenen Position. 1 is an overall perspective view of the entire proportional valve for the phaser, a longitudinal section through the proportional valve with the check valve in a closed position, a longitudinal section through the proportional valve with the check valve in an open position and a cross section through the proportional valve with the check valve in a closed position.
Ausführliche Beschreibung der Erfindung Detailed description of the invention
Das erfindungsgemäße Proportionalventil 1 ist für einen Nockenwellenverstel- ler einer Brennkraftmaschine vorgesehen. Dabei dient die über den Nocken- wellenversteller angetriebene Nockenwelle bei einer Brennkraftmaschine dazu, die für das Ausschieben der verbrannten Gase und das Ansaugen der Frischgase dienenden Gaswechselventile entgegen der Kraft von an jedem Gaswechselventil verbauter Ventilfedern zu öffnen. Starre Steuerzeiten für die Gaswechselventile stellen einen Kompromiss für die Auslegung hinsichtlich des erreichbaren Mitteldruckmaximums bzw. Drehmomentmaximums und des- sen Lagen im nutzbaren Drehzahlband sowie der erreichbaren Leistung bei Nenndrehzahl dar. Durch einen Nockenwellenversteller kann entsprechend dem jeweiligen Betriebszustand eine optimale Anpassung der Steuerzeiten der Gaswechselventile erreicht werden. Das Proportionalventil 1 weist gemäß Figur 1 ein elektromagnetisches Ansteuerteil 2 auf, dessen Betätigungskolben 6 mit einem Ventilkolben 3 (Figuren 2, 3, 4) in dem Proportionalventil 1 zusammenwirkt. Der Betätigungskolben 6 des Ansteuerteils 2 verschiebt dabei den Ventilkolben 3 in einer Kolbenführungshülse 4 des Proportionalventils 1 zwischen zwei Endstellungen und bewirkt dadurch eine geregelte Verstellung der Steuerzeiten am Nockenwellenversteller. Das Proportionalventil 1 besteht neben dem Ansteuerteil 2 aus der Kolbenführungshülse 4 (siehe zur Detaildarstellung Figuren 2 bis 4), die im Bereich eines Druckmittelzulaufs 10 und eines Arbeitsanschlusses 1 1 b mit einer Um- spritzung 5 insbesondere aus einem Kunststoffwerkstoff versehen ist. In der Kolbenführungshülse 4 ist der Ventilkolben 3 von dem Ansteuerteil 2 mittels des Betätigungskolbens 6 (Figuren 2 und 3) gegen die Kraft einer Ventilfeder 7 verschiebbar. The proportional valve 1 according to the invention is provided for a camshaft adjuster of an internal combustion engine. In the case of an internal combustion engine, the camshaft driven by the camshaft adjuster serves to open the gas exchange valves used for pushing out the combusted gases and sucking in the fresh gases against the force of valve springs mounted on each gas exchange valve. Rigid control times for the gas exchange valves represent a compromise for the design with regard to the achievable mean-pressure maximum or torque maximum and its locations in the usable speed range and the achievable power at rated speed. By a camshaft adjuster can be achieved according to the respective operating condition, an optimal adjustment of the timing of the gas exchange valves become. The proportional valve 1, according to Figure 1, an electromagnetic drive part 2, the actuating piston 6 with a valve piston 3 (Figures 2, 3, 4) cooperates in the proportional valve 1. The actuating piston 6 of the control part 2 displaces the valve piston 3 in a piston guide sleeve 4 of the proportional valve 1 between two end positions and thereby causes a controlled adjustment of the timing on the camshaft adjuster. The proportional valve 1 is in addition to the control part 2 of the piston guide sleeve 4 (see Figures 2 to 4 for detailed illustration), which in the range of a pressure medium inlet 10 and a working port 1 1 b with a Um- injection 5 is provided in particular of a plastic material. In the piston guide sleeve 4, the valve piston 3 is displaceable by the actuation part 2 by means of the actuation piston 6 (FIGS. 2 and 3) against the force of a valve spring 7.
Die mit der Umspritzung 5 versehene Kolbenführungshülse 4 ist in eine Aufnahmehülse 8 eingesetzt und an ihrem vom Ansteuerteil 2 abgewandten Ende mit dieser über eine Schnappverbindung 9 (Figur 2, 3) genau positioniert festgelegt. Das Proportionalventil 1 weist vier Hydraulikfluidanschlüsse auf, näm- lieh einen mit einer Pumpe verbundenen Druckmittelzulauf 10, zwei Arbeitsanschlüsse 1 1 a, 1 1 b und einem mit einem Tank verbundenen Rücklaufanschluss 1 1 c, der durch das Innere des hohlzylindrischen Ventilkolbens 3 führt. The provided with the encapsulation 5 piston guide sleeve 4 is inserted into a receiving sleeve 8 and fixed at its end remote from the control part 2 end with this via a snap connection 9 (Figure 2, 3) accurately positioned. The proportional valve 1 has four hydraulic fluid connections, namely lent a connected to a pump pressure medium inlet 10, two working ports 1 1 a, 1 1 b and connected to a tank return port 1 1 c, which leads through the interior of the hollow cylindrical valve piston 3.
Über den Druckmittelzulauf 10 wird das Hydraulikfluid, das insbesondere das Motoröl der Brennkraftmaschine ist, dem Proportionalventil 1 zugeführt und durch entsprechende Durchtritte in der Aufnahmehülse 8, der Umspritzung 5 und je nach Stellung des Ventilkolbens 3 über einen von Steuerkolben 12a und 12b als Teil des Ventilkolbens 3 begrenzten Ringraums 12 zu den Arbeitsanschlüssen 1 1 a, 1 1 b geführt. About the pressure medium inlet 10, the hydraulic fluid, which is in particular the engine oil of the internal combustion engine, the proportional valve 1 and fed through corresponding passages in the receiving sleeve 8, the encapsulation 5 and depending on the position of the valve piston 3 via a control piston 12a and 12b as part of the valve piston 3 limited annulus 12 to the working ports 1 1 a, 1 1 b out.
Vom Arbeitsanschluss 1 1 a ist eine Verbindung zum Rücklaufanschluss 1 1 c über eine Verbindungsöffnung 16 im Ventilkolben 3 herstellbar. An dem Druckmittelzulauf 10, sowie den Arbeitsanschlüssen 1 1 a, 1 1 b sind Ringfilter 17 vorgesehen. Sie sollen das Eindringen von Schmutz in das Proportionalventil 1 verhindern. From the working port 1 1 a is a connection to the return port 1 1 c via a connection opening 16 in the valve piston 3 produced. At the pressure medium inlet 10, and the working ports 1 1 a, 1 1 b ring filter 17 are provided. They are intended to prevent the ingress of dirt into the proportional valve 1.
Durch dieses erfindungsgemäß ausgestaltete Proportionalventil 1 wird eine definierte Verstellung der Nockenwelle gegenüber einem beispielsweise zahn- riemenbetätigten oder kettenbetätigten Antriebsrad erreicht. Dies wird bei- spielsweise durch einen oder mehrere mit der Nockenwelle verbundenen Verstellkolben des Nockenwellenverstellers 1 erreicht, der/die durch in gegenüberliegende Verstellkolbenräume, die mit den Arbeitsanschlüssen 1 1 a, 1 1 b in Ver- bindung stehen, durch eingeführtes Hydraulikfluid relativ zu dem Antriebsrad verdreht wird/werden. By means of this proportional valve 1 designed according to the invention, a defined adjustment of the camshaft is achieved with respect to an example toothed belt-operated or chain-operated drive wheel. This is achieved, for example, by one or more adjusting pistons of the camshaft adjuster 1 which are connected to the camshaft and which are guided through opposing adjusting piston chambers which communicate with the working ports 11a, 11b. are binding, is rotated by imported hydraulic fluid relative to the drive wheel / be.
Um ein Rückströmen des im Ringraum 12 befindlichen Motoröls in den Hydrau- likfluidzugang 10 zu verhindern, was durch die an der Nockenwelle und somit an den Verstellkolben des Nockenwellenverstellers wirkenden Wechselmomenten geschehen kann, ist in den Hydraulikfluidzugang 10 ein Rückschlagventil 13 eingesetzt, das in einer Schließstellung an der Aufnahmehülse 8 (Figur 2) und in einer Offenstellung an der Umspritzung 5 (Figur 3) anliegt. Dabei bilden die Kolbenführungshülse 4, die Umspritzung 5 und die Aufnahmehülse 8 einen Ringspalt 14 (Figur 4), in dem das Rückschlagventil 13 angeordnet ist. Um das als axial geschlitzte Federhülse ausgebildete Rückschlagventil 13 (Reedventil) im Ringspalt 14 zuverlässig zu positionieren, weist die Aufnahmehülse 8 eine Nase 15 auf, die mit der Umspritzung 5 zusammenwirkt. Diese Nase 15 bewirkt, dass das Rückschlagventil 13 sich innerhalb des Ringspalts 14 nicht verdrehen kann. Dadurch ist eine Fehlfunktion ausgeschlossen ist. Weiterhin ist durch die erfindungsgemäße Ausgestaltung sichergestellt, dass das Rückschlagventil 13 in der Offenstellung mit dem Ventilkolben 3 nicht in Kontakt kommen kann. In order to prevent backflow of the engine oil located in the annular space 12 into the hydraulic fluid access 10, which can be done by the alternating torques acting on the camshaft and thus on the adjusting piston of the camshaft adjuster, a check valve 13 is inserted in the hydraulic fluid access 10, which in a closed position on the receiving sleeve 8 (Figure 2) and in an open position on the encapsulation 5 (Figure 3) is applied. In this case, the piston guide sleeve 4, the encapsulation 5 and the receiving sleeve 8 form an annular gap 14 (Figure 4), in which the check valve 13 is arranged. In order to reliably position the non-return valve 13 (reed valve) designed as an axially slotted spring sleeve in the annular gap 14, the receiving sleeve 8 has a nose 15 which cooperates with the encapsulation 5. This nose 15 causes the check valve 13 can not rotate within the annular gap 14. This is a malfunction is excluded. Furthermore, it is ensured by the inventive design that the check valve 13 in the open position with the valve piston 3 can not come into contact.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
Proportionalventil proportional valve
Ansteuerteil  activating part
Ventilkolben  plunger
Kolbenführungshülse  Piston sleeve
Umsphtzung  Umsphtzung
Betätigungskolben  actuating piston
Ventilfeder  valve spring
Aufnahmehülse  receiving sleeve
Schnappverbindung  snap
Druckmittelzulauf Pressure inflow
a, 1 1 b Arbeitsanschlussa, 1 1 b Work connection
c Rücklaufanschluss c return connection
Ringraum annulus
a, 12b Steuerkolben a, 12b spool
Rückschlagventil  check valve
Ringspalt  annular gap
Nase  nose
Verbindungsöffnung  connecting opening
Ringfilter  ring filter

Claims

Patentansprüche claims
Proportionalventil (1 ) mit einer Kolbenführungshülse (4) und einem in der Kolbenführungshülse (4) bewegbaren Ventilkolben (3) sowie mit einem in einem Druckmittelzulauf (10) zu dem Proportionalventil (1 ) angeordneten Rückschlagventil (13), dadurch gekennzeichnet, dass das Rückschlagventil (13) in einem die Kolbenführungshülse (4) im Bereich des Druckmittelzulaufs (10) umgebenden Ringspalt (14) angeordnet ist. Proportional valve (1) with a piston guide sleeve (4) and in the piston guide sleeve (4) movable valve piston (3) and with a in a pressure medium inlet (10) to the proportional valve (1) arranged check valve (13), characterized in that the check valve (13) in a piston guide sleeve (4) in the region of the pressure medium inlet (10) surrounding the annular gap (14) is arranged.
Proportionalventil (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass der Ringspalt (14) von einer die Kolbenführungshülse (4) zumindest teilweise umgebenden Umspritzung (5) und einer zumindest einen Teilbereich der Umspritzung (5) umfassenden Aufnahmehülse (8) begrenzt ist. Proportional valve (1) according to claim 1, characterized in that the annular gap (14) of the piston guide sleeve (4) at least partially surrounding encapsulation (5) and at least a portion of the encapsulation (5) comprising receiving sleeve (8) is limited.
Proportionalventil (1 ) nach Anspruch 2, dadurch gekennzeichnet, dass die Aufnahmehülse (8) an ihrem axialen Ende einen einen Teilbereich des Ringspaltes (14) bildenden Aufnahmespalt aufweist, in den das Rückschlagventil (13) eingesetzt ist. Proportional valve (1) according to claim 2, characterized in that the receiving sleeve (8) has at its axial end a portion of the annular gap (14) forming the receiving gap, in which the check valve (13) is inserted.
Proportionalventil (1 ) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die mit der Umspritzung (5) versehene Kolbenführungshülse (4) stoffschlüssig mit der Aufnahmehülse (8) verbunden ist. Proportional valve (1) according to claim 2 or 3, characterized in that the with the encapsulation (5) provided piston guide sleeve (4) is integrally connected to the receiving sleeve (8).
Proportionalventil (1 ) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die mit der Umspritzung (5) versehene Kolbenführungshülse (4) kraft- oder formschlüssig mit der Aufnahmehülse (8) verbunden ist. Proportional valve (1) according to claim 2 or 3, characterized in that the overmold (5) provided with piston guide sleeve (4) non-positively or positively connected to the receiving sleeve (8).
Proportionalventil (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Rückschlagventil (13) als in axialer Richtung geschlitzte Federhülse ausgebildet ist. Proportional valve (1) according to one of the preceding claims, characterized in that the check valve (13) is designed as a slotted spring sleeve in the axial direction.
7. Proportionalventil (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Rückschlagventil (13) aus einem metallischen Werkstoff gefertigt ist. 7. Proportional valve (1) according to one of the preceding claims, characterized in that the check valve (13) is made of a metallic material.
8. Proportionalventil (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Umspritzung (5) an ihrer Außenmantelfläche einen radial in Öffnungsrichtung des Rückschlagventils (13) wirkenden Anschlag bildet. 8. Proportional valve (1) according to one of the preceding claims, characterized in that the encapsulation (5) on its outer circumferential surface forms a radially acting in the opening direction of the check valve (13) stop.
9. Proportionalventil (1 ) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Aufnahmehülse (8) an ihrer Innenmantelfläche einen radial in Schließrichtung des Rückschlagventils (13) wirkenden Anschlag bildet. 9. Proportional valve (1) according to one of the preceding claims, characterized in that the receiving sleeve (8) on its inner circumferential surface forms a radially acting in the closing direction of the check valve (13) stop.
10. Montageverfahren für ein Proportionalventil (1 ) mit einer Kolbenführungshülse (4) und einem in der Kolbenführungshülse (4) bewegbaren Ventilkolben (3) sowie mit einem in einem Druckmittelzulauf (10) zu dem Proportionalventil (1 ) angeordneten Rückschlagventil (13), dadurch gekennzeichnet, dass das Rückschlagventil (13) in einen einen Teilbe- reich des Ringspalts (14) bildenden Aufnahmespalt der Aufnahmehülse10. Assembly method for a proportional valve (1) with a piston guide sleeve (4) and in the piston guide sleeve (4) movable valve piston (3) and with a in a pressure medium inlet (10) to the proportional valve (1) arranged check valve (13), characterized characterized in that the check valve (13) in a part of the region of the annular gap (14) forming the receiving gap of the receiving sleeve
(8) eingesetzt wird und anschließend die mit der Umspritzung (5) versehene Kolbenführungshülse (4) in die Aufnahmehülse (8) eingeführt und mit dieser verbunden wird. (8) is inserted and then the with the encapsulation (5) provided piston guide sleeve (4) is inserted into the receiving sleeve (8) and connected thereto.
EP11701505.7A 2010-02-26 2011-01-25 Proportional valve, in particular for a camshaft adjuster Not-in-force EP2539554B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010009401 DE102010009401A1 (en) 2010-02-26 2010-02-26 Proportional valve, in particular for a camshaft adjuster
PCT/EP2011/050977 WO2011104058A1 (en) 2010-02-26 2011-01-25 Proportional valve, in particular for a camshaft adjuster

Publications (2)

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EP2539554A1 true EP2539554A1 (en) 2013-01-02
EP2539554B1 EP2539554B1 (en) 2017-09-06

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US (1) US20120312396A1 (en)
EP (1) EP2539554B1 (en)
KR (1) KR20130008013A (en)
CN (1) CN102770627B (en)
BR (1) BR112012021449A2 (en)
DE (1) DE102010009401A1 (en)
WO (1) WO2011104058A1 (en)

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US20120312396A1 (en) 2012-12-13
CN102770627B (en) 2015-05-06
WO2011104058A1 (en) 2011-09-01
DE102010009401A1 (en) 2011-09-01
CN102770627A (en) 2012-11-07
EP2539554B1 (en) 2017-09-06
BR112012021449A2 (en) 2016-05-31
KR20130008013A (en) 2013-01-21

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