WO2006136294A1 - Device for hydraulically switching valve lift - Google Patents

Device for hydraulically switching valve lift Download PDF

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Publication number
WO2006136294A1
WO2006136294A1 PCT/EP2006/005511 EP2006005511W WO2006136294A1 WO 2006136294 A1 WO2006136294 A1 WO 2006136294A1 EP 2006005511 W EP2006005511 W EP 2006005511W WO 2006136294 A1 WO2006136294 A1 WO 2006136294A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
throttle valve
cylinder head
guide element
oil
Prior art date
Application number
PCT/EP2006/005511
Other languages
German (de)
French (fr)
Inventor
Jan Zimmermann
Original Assignee
Gm Global Technology Operations, Inc.
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 Gm Global Technology Operations, Inc. filed Critical Gm Global Technology Operations, Inc.
Publication of WO2006136294A1 publication Critical patent/WO2006136294A1/en

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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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • 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
    • 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
    • F01L2001/3443—Solenoid driven oil control valves
    • 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
    • F01L2001/34433—Location oil control valves

Definitions

  • EP 0 671 550 A1 discloses a generic device for hydraulic valve lift switching in an internal combustion engine.
  • the hydraulic pressures in respectively associated oil passages are released at low temperature when the internal combustion engine starts to operate.
  • hydraulic pressure is applied to the one oil passage, but the hydraulic pressure in the second oil passage is released.
  • the hydraulic pressure is applied to both oil passages.
  • the connection and disconnection of the switching element used for this purpose is performed by operating integrated switching mechanisms in response to the application of the hydraulic pressure to the oil passages.
  • the oil supply channel of the throttle valve is at least partially formed by an extension tube inserted into an oil supply bore of the cylinder head.
  • the inserted extension tube allows a simple coupling of the lubricating oil supply to the throttle valve integrated in the guide element.
  • the guide element according to the invention consists of a pourable material - preferably a light metal - and has on the timing chain contact surface on an additional sliding coating over which the guide element is in contact with the timing chain and this leads.
  • the guide element may be made of plastic, wherein the sliding lining may also be omitted.
  • the electromagnetic throttle valve for valve lift switching between at least two throttle Positions switchable wherein the valve body containing the valve body is at least partially housed in a corresponding recess of the guide member, further comprising the electromagnetic actuator unit of the valve mechanism, including electrical connection is disposed outside of the guide member. It is also conceivable to completely integrate the electromagnetic throttle valve for valve lift switching in the guide element, so that only its electrical connection is accessible to the outside.
  • the partial integration in the guide element described above, however, has the advantage that the relative to the valve mechanism repair-prone electromagnetic actuator unit is easily accessible from the outside for repair purposes.
  • the electromagnetic throttle valve also supplies lubricating oil for lubrication of the timing chain in addition to the valve lift.
  • a riser passage extends from the throttle valve through the guide element, which opens out at the timing chain contact surface. At this point, lubricating oil can get from the throttle valve to the timing chain, which is lubricated over this.
  • the electromagnetic throttle valve thus serves in addition to the limitation of the oil pressure in Hydraulic valve lift switching also the branching of the oil flow for lubrication purposes.
  • Figure 1 is a perspective view of the part of a cylinder head of an internal combustion engine with in a
  • FIG. 2 shows a partial cross section through the cylinder head according to FIG. 1 in the region of the guide element to be attached here, and FIG.
  • FIG. 3 shows a cross section through an integrated in the guide element of Figure 1 throttle valve for mounting on the
  • a cylinder head 1 of an internal combustion engine (not shown) has two overhead camshafts, of which only one camshaft 2 is illustrated here.
  • the camshaft 2 is offset by means of timing chain 3 (indicated schematically here) in a conventional manner in rotational movement to actuate the switching element 4 via the cam.
  • the cylinder head 1 has a circulating oil gallery 5.
  • the switching elements 4 are each assigned - operated here - not shown - Hydrolifter, which are arranged within a receptacle 6 on the cylinder head 1.
  • a guide element 7 is provided for the timing chain 3 above the cylinder head 1.
  • the guide member 7 is made of a light metal and is provided at the timing chain contact surface with a sliding coating 8. To adjust different valve strokes is an operatively connected to the oil gallery 5 electromagnetically actuated throttle valve 9, which is partially integrated in the mounted on the cylinder head 1 guide member 7 for the timing chain 3.
  • the oil gallery 5 integrated in the cylinder head 1 comprises an oil supply riser 10, which is equipped with an inserted extension pipe 11.
  • the inserted extension tube 11 serves to supply oil to the throttle valve (not shown in this figure).
  • the electromagnetic throttle valve 9 is fed to the valve lift switching, starting from an oil supply passage 13 with lubricating oil, which passes through the guide member 7 therethrough.
  • the oil supply channel 13 extends - not shown here - extension tube 11 into it.
  • the valve body 14 containing the valve mechanism of the throttle valve 9 is partially accommodated in a corresponding recess of the guide element 7.
  • the electromagnetic throttle valve 9 further comprises an electromagnetic actuator 15, with which the valve mechanism is switchable.
  • the electromagnetic actuating unit 15 is together with an external electrical connection 16 outside the Guiding element 7 is arranged.
  • the oil pressure present from the oil supply channel 13 is more or less throttled forward to the oil drain channel 17 and from here reaches the siphon chamber 12 of the oil gallery 5 (not shown here).
  • the valve mechanism integrated in the electromagnetic throttle valve 9 branches the oil flow, so that a portion of the oil flow also flows through a riser duct 18 in the region of the sliding lining 8, which is also shown in the guide element 7.
  • the electromagnetic throttle valve 9 is fastened detachably to the guide element 7 via a fastening screw 19.

Abstract

Device for hydraulically switching valve lift in an internal combustion engine having a plurality of switching elements (3) whose activation is carried out by means of at least one cam shaft (2) which is rotatably mounted on the cylinder head (1) and driven by a control chain (3) in order to switch in each case one inlet/outlet valve, the switching element (4) being adjustable hydraulically by means of a throttle valve (9) in order to set at least two different valve lifts, the electromagnetically activated throttle valve (9) being integrated at least partially into a guide element (7), mounted on the cylinder head (1), for the control chain (3).

Description

Einrichtung zur hydraulischen Vβntilhubumschaltung Device for hydraulic Vβntilhubumschaltung
B e s c h r e i b u n gDescription
Die vorliegende Erfindung betrifft eine Einrichtung zur hydraulischen Ventilhubumschaltung bei einem Verbrennungsmotor mit mehreren Schaltelementen, deren Betätigung durch mindestens eine am Zylinderkopf drehbar gelagerte und durch eine Steuerkette angetriebene Nockenwelle erfolgt, um ein je zugeordnetes Einlass-/Auslassventil zu schalten, wobei das Schaltelement zur Einstellung mindestens zwei unterschiedlicher Ventilhübe hydraulisch über ein Drosselventil verstellbar ist.The present invention relates to a device for hydraulic valve lift switching in an internal combustion engine having a plurality of switching elements, the actuation of which is effected by at least one rotatably mounted on the cylinder head and driven by a timing chain camshaft to switch an associated each inlet / outlet valve, wherein the switching element for adjusting at least two different valve lifts hydraulically via a throttle valve is adjustable.
Durch die hydraulische Ventilhubumschaltung ändert sich sowohl der Ventilhub als auch die Ventilsteuerzeit. Im niedrigen und mittleren Drehzahlbereich des Verbrennungsmotors sorgen kleine Ventilhübe mit dem damit verbundenen geringen Öffnungsquerschnitt für eine höhere Einströmgeschwindigkeit und damit für eine bessere Verwirbelung der Frischluft im Zylinder. Damit ist in der Teillast eine sehr gute Gemischaufbereitung gewährleistet. Bei hoher Drehzahl und hoher Drehmomentforderung - bei Volllast - ist aufgrund der geforderten hohen Motorleistung die maximale Füllung erforderlich. Hierzu wird der große Ventilhub eingestellt. Die Umschaltung auf verschiedene Ventilhübe wird dadurch erreicht, dass ein Zusatznocken der Nockenwelle eines vorher freischwingenden Schaltschlepphebels als Schalt- element auf einen Standard-Kipphebel drehzahlabhängig eingekoppelt wird.The hydraulic valve lift switching changes both the valve lift and the valve timing. In the low and medium speed range of the internal combustion engine small valve strokes with the associated small opening cross-section provide for a higher inflow velocity and thus for a better turbulence of the fresh air in the cylinder. This ensures a very good mixture preparation in the partial load. At high speed and high torque demand - at full load - the maximum charge is required due to the required high engine power. For this purpose, the large valve lift is adjusted. The switchover to different valve lifts is achieved in that an additional cam of the camshaft of a previously free-swinging rocker arm as Schalt- element is coupled to a standard rocker arm speed-dependent.
Aus der DE 102004 007766 Al geht ein derartiges nach Art eines Schaltschlepphebels aufgebautes Schaltelement zur Einstellung unterschiedlicher Nockenhübe hervor. Dieser besteht aus einem Außenhebel, zwischen dessen Armen ein Innenhebel verschwenkbeweglich gelagert ist. So wird bei Kopplung ein großer und bei Entkopplung ein kleiner oder Null-Ventilhub generiert. Als Koppelmittel umfasst das Schaltelement einen längs verlagerbaren Schieber, der innerhalb einer Längsbohrung im Schaltelement angeordnet ist und über Druckmittel betätigbar ist. Der Schieber ist in der Koppelrichtung über die Kraft des Druckmittels verlagerbar.From DE 102004 007766 Al, such a built-up in the manner of a shift rocker lever switching element for setting different cam strokes out. This consists of an outer lever, between the arms of an inner lever is pivotally mounted. Thus, a small or zero valve lift is generated when coupling a large and decoupling. As a coupling means, the switching element comprises a longitudinally displaceable slide, which is arranged within a longitudinal bore in the switching element and can be actuated via pressure medium. The slider is displaceable in the coupling direction via the force of the pressure medium.
Aus der EP 0 671 550 Al geht eine gattungsgemäße Einrichtung zur hydraulischen Ventilhubumschaltung bei einem Verbrennungsmotor hervor. Über zwei den Hydraulikdruck steuernde Drosselventile werden die Hydraulikdrücke in jeweils zugeordne- ten Ölpassagen bei Betriebsstart des Verbrennungsmotors bei niedriger Temperatur gelöst. Wenn nach dem Start des Verbrennungsmotors ein Niederdrehzahl-Betriebszustand erreicht ist, wird an der einen Ölpassage Hydraulikdruck angelegt, jedoch wird der Hydraulikdruck in der zweiten Ölpassage gelöst. Wenn ferner der Verbrennungsmotor einen Hochdrehzahl-Betriebszustand erreicht hat, wird der Hydraulikdruck an beide Ölpassagen angelegt. Das Verbinden und Trennen des hierfür zum Einsatz kommenden Schaltelements erfolgt durch Betätigung integrierter Umschaltmechanismen in Antwort auf das Anlegen des Hydraulikdrucks an die Ölpassagen.EP 0 671 550 A1 discloses a generic device for hydraulic valve lift switching in an internal combustion engine. By means of two throttle valves which control the hydraulic pressure, the hydraulic pressures in respectively associated oil passages are released at low temperature when the internal combustion engine starts to operate. When a low-speed operation state is reached after the start of the engine, hydraulic pressure is applied to the one oil passage, but the hydraulic pressure in the second oil passage is released. Further, when the internal combustion engine has reached a high-speed operating state, the hydraulic pressure is applied to both oil passages. The connection and disconnection of the switching element used for this purpose is performed by operating integrated switching mechanisms in response to the application of the hydraulic pressure to the oil passages.
Bei einer hydraulischen Ventilhubumschaltung der vorstehend beschriebenen Art tritt das Problem auf, dass das zur hydraulischen Einstellung der Ventilhübe zum Einsatz kommende Drosselventil an geeigneter Stelle im Bereich des Zylinderkopfes des Verbrennungsmotors vorzusehen ist. Bauraum ist hier jedoch knapp .In a hydraulic valve lift of the type described above, the problem arises that the hydraulic adjustment of the valve strokes used to be used throttle valve at a suitable location in the region of the cylinder head of the internal combustion engine is provided. Space is scarce here.
Es ist daher die Aufgabe der vorliegenden Erfindung das Drosselventil einer hydraulischen Ventilhubumschaltung bei einem Verbrennungsmotor bauraum-optimal und gut zugänglich am Zylinderkopf anzuordnen.It is therefore the object of the present invention to arrange the throttle valve of a hydraulic valve lift switching in an internal combustion engine space optimally and easily accessible to the cylinder head.
Die Aufgabe wird ausgehend von einer Einrichtung gemäß dem Oberbegriff von Anspruch 1 in Verbindung mit dessen kennzeichnenden Merkmalen gelöst. Die nachfolgenden abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.The object is achieved on the basis of a device according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention.
Die Erfindung schließt die technische Lehre ein, dass das elektromagnetisch betätigbare Drosselventil zumindest teilweise in einem am Zylinderkopf angebrachten Führungselement für die Steuerkette integriert ist.The invention includes the technical teaching that the electromagnetically operable throttle valve is at least partially integrated in a mounted on the cylinder head guide element for the timing chain.
Der Vorteil der erfindungsgemäßen Lösung liegt insbesondere darin, dass das sowieso zur Führung der Steuerkette vorzusehende Führungselement das Drosselventil aufnimmt, wel- ches in soweit nicht separat an andere Stelle am Zylinderkopf angebracht werden muss. Das Führungselement für die Steuerkette ist meist oberhalb des Zylinderkopfes im Bereich zwischen beiden Nockenwellen angeordnet. Die Steuerkette verläuft ausgehend von der Kurbelwelle und ggf. über Umlenkrollen über beide Nockenwel- len und wird dabei durch das Führungselement geführt. Durch die Integration des Drosselventils in das Führungselement sind weniger Bauteile erforderlich, die Anzahl der Montageoperation verringert sich und das Führungselement kann des Weiteren auch zur Zuführung und Abführung des Schmieröls entsprechende Kanäle aufnehmen. Da das Drosselventil der hydraulischen Ventil- hubumschaltung erfindungsgemäß in bestehenden Bauraum eingebracht ist, ist auch keine zusätzliche Abdichtung erforderlich. Des Weiteren ist Modularität im Sinne von Ausstattung desThe advantage of the solution according to the invention is, in particular, that the guide element to be provided anyway for guiding the timing chain accommodates the throttle valve, which does not have to be separately attached to another location on the cylinder head. The guide element for the timing chain is usually arranged above the cylinder head in the region between the two camshafts. The timing chain runs starting from the crankshaft and optionally via deflection rollers over both camshafts and is thereby guided through the guide element. By integrating the throttle valve into the guide member, fewer components are required, the number of assembly operations is reduced, and the guide member can also be used take appropriate channels for supplying and discharging the lubricating oil. Since the throttle valve of the hydraulic valve lift switching is inventively introduced into existing space, no additional sealing is required. Furthermore, modularity is in the sense of equipping the
Verbrennungsmotors mit oder ohne Schaltelement durch einfaches Austauschen des Drosselventils am Führungselement erreichbar.Internal combustion engine with or without switching element accessible by simply replacing the throttle valve on the guide element.
Gemäß einer die Erfindung verbessernden Maßnahme ist vorgesehen, dass der Ölversorgungskanal des Drosselventils wenigsten teilweise durch ein in eine Ölversorgungssteigbohrung des Zylinderkopfes eingestecktes Verlängerungsrohr gebildet ist. Das eingesteckte Verlängerungsrohr ermöglicht eine einfache Ankopplung der Schmierölversorgung an das im Führungselement integrierte Drosselventil.According to a measure improving the invention, it is provided that the oil supply channel of the throttle valve is at least partially formed by an extension tube inserted into an oil supply bore of the cylinder head. The inserted extension tube allows a simple coupling of the lubricating oil supply to the throttle valve integrated in the guide element.
Vorzugsweise ist im Zylinderkopf ein Syphonraum einer Ölgalerie eingebracht, und zwar konzentrisch um die Ölversorgungssteigbohrung des Zylinderkopfes zum Drosselventil hin. Der Syphonraum der Ölgalerie verhindert ein Leerlaufen der Ölgalerie, was Folgeschäden bis hin zur Zerstörung des Verbrennungsmotors nach sich ziehen könnte.Preferably, a siphon space of an oil gallery is introduced in the cylinder head, specifically concentrically around the oil supply bore of the cylinder head to the throttle valve. The siphon room of the oil gallery prevents emptying of the oil gallery, which could lead to consequential damage up to the destruction of the internal combustion engine.
Das erfindungsgemäße Führungselement besteht aus einem gießfähigen Material - vorzugsweise einem Leichtmetall - und weist auf dessen Steuerketten-Kontaktfläche einen zusätzlichen Gleitbelag auf, über welchen das Führungselement mit der Steuerkette in Kontakt steht und diese führt. Daneben ist es auch denkbar, dass das Führungselement aus Kunststoff bestehen kann, wobei der Gleitbelag ggf. auch entfallen kann.The guide element according to the invention consists of a pourable material - preferably a light metal - and has on the timing chain contact surface on an additional sliding coating over which the guide element is in contact with the timing chain and this leads. In addition, it is also conceivable that the guide element may be made of plastic, wherein the sliding lining may also be omitted.
Vorzugsweise ist das elektromagnetische Drosselventil zur Ventilhubumschaltung zwischen mindestens zwei Drossel- Stellungen umschaltbar, wobei der die Ventilmechanik enthaltende Ventilkörper zumindest teilweise in einer korrespondierenden Ausnehmung des Führungselements untergebracht ist, wobei ferner die elektromagnetische Betätigungseinheit der Ventilmechanik samt elektrischem Anschluss außerhalb des Führungselements angeordnet ist. Es ist auch denkbar, das elektromagnetische Drosselventil zur Ventilhubumschaltung vollständig in das Führungselement zu integrieren, so dass lediglich dessen elektrischer Anschluss nach außen hin zugänglich ist. Die vorstehend beschriebene teilweise Integration im Führungselement hat demgegenüber jedoch den Vorteil, dass die gegenüber der Ventilmechanik reparaturanfällige elektromagnetische Betätigungseinheit von außen her zur Reparaturzwecken gut zugänglich ist.Preferably, the electromagnetic throttle valve for valve lift switching between at least two throttle Positions switchable, wherein the valve body containing the valve body is at least partially housed in a corresponding recess of the guide member, further comprising the electromagnetic actuator unit of the valve mechanism, including electrical connection is disposed outside of the guide member. It is also conceivable to completely integrate the electromagnetic throttle valve for valve lift switching in the guide element, so that only its electrical connection is accessible to the outside. The partial integration in the guide element described above, however, has the advantage that the relative to the valve mechanism repair-prone electromagnetic actuator unit is easily accessible from the outside for repair purposes.
In diesem Zusammenhang bietet es sich an, das elektromagnetische Drosselventil mit nur einer Befestigungsschraube lösbar am Führungselement zu befestigen. Denn es hat sich gezeigt, dass eine einzige Befestigungsschraube ausreicht, um eine zuverlässige lösbare Verbindung zwischen Drosselventil und Führungselement herzustellen. Hierüber lässt sich das elektromagnetische Drosselventil in besonders einfacher Weise montieren oder demontieren.In this context, it makes sense to attach the electromagnetic throttle valve with only one fastening screw releasably on the guide element. Because it has been shown that a single fastening screw is sufficient to produce a reliable detachable connection between the throttle valve and guide element. This allows the electromagnetic throttle valve in a particularly simple way assemble or disassemble.
Gemäß einer weiteren die Erfindung verbesserndeAccording to another invention improving the invention
Maßnahme ist vorgesehen, dass das elektromagnetische Drosselventil neben der Ventilhubumschaltung auch Schmieröl zur Schmierung der Steuerkette liefert. Zu diesem Zwecke verläuft vom Drosselventil aus ein Steigkanal durch das Führungselement, der an der Steuerketten-Kontaktfläche ausmündet. An dieser Stelle kann Schmieröl ausgehend vom Drosselventil an die Steuerkette gelangen, welche hierüber geschmiert wird. Das elektromagnetische Drosselventil dient somit neben der Begrenzung des Öldrucks im Rahmen der hydraulischen Ventilhubumschaltung auch dem Verzweigen des Ölstroms zu Schmierungszwecken.Measure is provided that the electromagnetic throttle valve also supplies lubricating oil for lubrication of the timing chain in addition to the valve lift. For this purpose, a riser passage extends from the throttle valve through the guide element, which opens out at the timing chain contact surface. At this point, lubricating oil can get from the throttle valve to the timing chain, which is lubricated over this. The electromagnetic throttle valve thus serves in addition to the limitation of the oil pressure in Hydraulic valve lift switching also the branching of the oil flow for lubrication purposes.
Weitere die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
Figur 1 eine perspektivische Darstellung des Teils eines Zylinderkopfes eines Verbrennungsmotors mit in einenFigure 1 is a perspective view of the part of a cylinder head of an internal combustion engine with in a
Führungselement für die Steuerkette integrierten Drosselventil zur hydraulischen Ventilhubumschaltung,Guide element for the timing chain integrated throttle valve for hydraulic valve lift switching,
Figur 2 einen teilweise Querschnitt durch den Zylinderkopf nach Figur 1 im Bereich des hier anzubringenden Führungselements, undFIG. 2 shows a partial cross section through the cylinder head according to FIG. 1 in the region of the guide element to be attached here, and FIG
Figur 3 einen Querschnitt durch ein im Führungselement nach Figur 1 integriertes Drosselventil zur Montage auf den3 shows a cross section through an integrated in the guide element of Figure 1 throttle valve for mounting on the
Zylinderkopf nach Figur 2.Cylinder head according to FIG. 2.
Gemäß Figur 1 weist ein Zylinderkopf 1 eines - nicht weiter dargestellten - Verbrennungsmotors zwei obenliegende Nockenwellen auf, von welchen hier nur die eine Nockenwelle 2 zeichnerisch dargestellt ist. Die Nockenwelle 2 wird mittels Steuerkette 3 (hier schematisch angedeutet) in an sich bekannter Weise in Drehbewegung versetzt, um über deren Nocken das Schaltelement 4 zu betätigen. Zur hydraulischen Ventilhubum- Schaltung weist der Zylinderkopf 1 eine umlaufende Ölgalerie 5 auf. Über die Ölgalerie 5 werden den Schaltelementen 4 je zugeordnete - hier nicht weiter dargestellte - Hydrolifter betätigt, die innerhalb einer Aufnahme 6 am Zylinderkopf 1 angeordnet sind. Zwischen den Nockenwellen 2 (nur eine dargestellt) ist oberhalb des Zylinderkopfes 1 ein Führungselement 7 für die Steuerkette 3 vorgesehen. Das Führungselement 7 besteht aus einem Leichtmetall und ist an dessen Steuerketten-Kontaktfläche mit einem Gleitbelag 8 versehen. Der Gleitbelag 8 dient zum Verschleißschutz des Führungselements 7. Zur Einstellung unterschiedlicher Ventilhübe dient ein mit der Ölgalerie 5 in Wirkverbindung stehendes elektromagnetisch betätigbares Drosselventil 9, welches teilweise in dem am Zylinderkopf 1 angebrachten Führungselement 7 für die Steuerkette 3 integriert ist.According to FIG. 1, a cylinder head 1 of an internal combustion engine (not shown) has two overhead camshafts, of which only one camshaft 2 is illustrated here. The camshaft 2 is offset by means of timing chain 3 (indicated schematically here) in a conventional manner in rotational movement to actuate the switching element 4 via the cam. For hydraulic valve lift circuit, the cylinder head 1 has a circulating oil gallery 5. About the oil gallery 5 the switching elements 4 are each assigned - operated here - not shown - Hydrolifter, which are arranged within a receptacle 6 on the cylinder head 1. Between the camshafts 2 (only one shown), a guide element 7 is provided for the timing chain 3 above the cylinder head 1. The guide member 7 is made of a light metal and is provided at the timing chain contact surface with a sliding coating 8. To adjust different valve strokes is an operatively connected to the oil gallery 5 electromagnetically actuated throttle valve 9, which is partially integrated in the mounted on the cylinder head 1 guide member 7 for the timing chain 3.
Gemäß Figur 2 umfasst die im Zylinderkopf 1 integrierte Ölgalerie 5 eine Ölversorgungssteigbohrung 10, die mit einem eingesteckten Verlängerungsrohr 11 ausgestattet ist. Das eingesteckte Verlängerungsrohr 11 dient der Ölversorgung des - in dieser Figur nicht dargestellten - Drosselventils. Um das Verlängerungsrohr 11 herum befindet sich ein Syphonraum 12 der Ölgalerie 5, der ein Leerlaufen verhindert.According to FIG. 2, the oil gallery 5 integrated in the cylinder head 1 comprises an oil supply riser 10, which is equipped with an inserted extension pipe 11. The inserted extension tube 11 serves to supply oil to the throttle valve (not shown in this figure). Around the extension tube 11 is a siphon room 12 of the oil gallery 5, which prevents emptying.
Im Hinblick auf Figur 3 ist das elektromagnetische Drosselventil 9 zur Ventilhubumschaltung ausgehend von einem Ölversorgungskanal 13 mit Schmieröl gespeist, welcher durch das Führungselement 7 hindurch verläuft. In den Ölversorgungskanal 13 ragt - das hier nicht weiter dargestellte - Verlängerungsrohr 11 hinein. Der die Ventilmechanik des Drosselventils 9 enthaltende Ventilkörper 14 ist teilweise in einer korrespondierenden Ausnehmung des Führungselements 7 untergebracht. Das elekt- romagnetische Drosselventil 9 umfasst ferner eine elektromagnetische Betätigungseinheit 15, mit welcher die Ventilmechanik schaltbar ist. Die elektromagnetische Betätigungseinheit 15 ist samt eines äußeren elektrischen Anschlusses 16 außerhalb des Führungselements 7 angeordnet. Der vom Ölversorgungskanal 13 her anstehende Öldruck wird je nach Schaltstellung der Ventilmechanik mehr oder weniger gedrosselt zum Ölablasskanal 17 weitergeleitet und gelangt von hier aus in den - hier nicht weiter dargestellten - Syphonraum 12 der Ölgalerie 5.With regard to Figure 3, the electromagnetic throttle valve 9 is fed to the valve lift switching, starting from an oil supply passage 13 with lubricating oil, which passes through the guide member 7 therethrough. In the oil supply channel 13 extends - not shown here - extension tube 11 into it. The valve body 14 containing the valve mechanism of the throttle valve 9 is partially accommodated in a corresponding recess of the guide element 7. The electromagnetic throttle valve 9 further comprises an electromagnetic actuator 15, with which the valve mechanism is switchable. The electromagnetic actuating unit 15 is together with an external electrical connection 16 outside the Guiding element 7 is arranged. Depending on the switching position of the valve mechanism, the oil pressure present from the oil supply channel 13 is more or less throttled forward to the oil drain channel 17 and from here reaches the siphon chamber 12 of the oil gallery 5 (not shown here).
Die im elektromagnetischen Drosselventil 9 integrierte Ventilmechanik verzweigt den Ölfluss, so dass ein Teil des Ölflusses über einen ebenfalls im Führungselement 7 ausgebilde- ten Steigkanal 18 im Bereich des Gleitbelages 8 zur - hier nicht weiter dargestellten - Steuerkette hinaus mündet. Das elektromagnetische Drosselventil 9 ist über eine Befestigungsschraube 19 lösbar am Führungselement 7 befestigt. The valve mechanism integrated in the electromagnetic throttle valve 9 branches the oil flow, so that a portion of the oil flow also flows through a riser duct 18 in the region of the sliding lining 8, which is also shown in the guide element 7. The electromagnetic throttle valve 9 is fastened detachably to the guide element 7 via a fastening screw 19.
B e z u g s z e i c h e n l i s t eC o m p a n c e m e n t i o n s
1 Zylinderkopf1 cylinder head
2 Nockenwelle 3 Steuerkette2 camshaft 3 timing chain
4 Schaltelement4 switching element
5 Ölgalerie5 oil gallery
6 Ausnehmung6 recess
7 Führungselement 8 Gleitbelag7 guide element 8 sliding coating
9 Drosselventil9 throttle valve
10 Ölversorgungssteigbohrung10 oil supply riser hole
11 Verlängerungsrohr11 extension tube
12 Syphonraum 13 Ölversorgungskanal12 Siphon room 13 Oil supply channel
14 Ventilkörper14 valve body
15 Betätigungseinheit15 operating unit
16 elektrischer Anschluss16 electrical connection
17 Ölauslasskanal 18 Steigkanal17 Oil outlet channel 18 Rising channel
19 Befestigungsschraube 19 fixing screw

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Einrichtung zur hydraulischen Ventilhubumschaltung bei einem Verbrennungsmotor mit mehreren Schaltelementen (3), deren Betätigung durch mindestens eine am Zylinderkopf (1) drehbar gelagerte und durch eine Steuerkette (3) angetriebene Nockenwelle (2) erfolgt, um ein jeweils zugeordnetes Einlass-/Auslassventil zu schalten, wobei das Schaltelement (4) zur Einstellung mindestens zweier unter- schiedlicher Ventilhübe hydraulisch über ein Drosselventil (9) verstellbar ist, dadurch gekennzeichnet, dass das elektromagnetisch betätigbare Drosselventil (9) zumindest teilweise in einem am Zylinderkopf (1) angebrachten Führungselement (7) für die Steuerkette (3) integriert ist.1. A device for hydraulic valve lift switching in an internal combustion engine having a plurality of switching elements (3), the actuation of which by at least one on the cylinder head (1) rotatably mounted and by a timing chain (3) driven camshaft (2) takes place to a respective associated inlet / outlet valve to switch, wherein the switching element (4) for adjusting at least two different valve lifts hydraulically via a throttle valve (9) is adjustable, characterized in that the electromagnetically operable throttle valve (9) at least partially in a cylinder head (1) mounted guide element ( 7) for the timing chain (3) is integrated.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Ölversorgungskanal (13) des Drosselventils (9) zumindest teilweise durch ein in eine Ölversorgungssteigbohrung (10) des Zylinderkopfes (1) eingestecktes Verlänge- rungsrohr (11) gebildet ist.2. Device according to claim 1, characterized in that the oil supply channel (13) of the throttle valve (9) at least partially by a in an oil supply riser hole (10) of the cylinder head (1) plugged extension tube (11) is formed.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass ein Syphonraum (12) einer Ölgalerie (5) konzentrisch um die Ölversorgungssteigbohrung (10) im Zylinderkopf (1) an- geordnet ist.3. A device according to claim 2, characterized in that a siphon space (12) of an oil gallery (5) concentrically about the oil supply riser hole (10) in the cylinder head (1) is arranged.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Führungselement (7) aus einem Metall oder Kunststoff besteht, wobei dessen Steuerketten-Kontaktfläche mit einem zusätzlichen Gleitbelag (8) versehen ist. 4. The device according to claim 1, characterized in that the guide element (7) consists of a metal or plastic, wherein the timing chain contact surface is provided with an additional sliding coating (8).
5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Ölversorgungskanal (13) mit dem aus der Ölgalerie (5) des Zylinderkopfs (1) stammenden Schmieröl gespeist ist.5. The device according to claim 1, characterized in that the oil supply channel (13) is fed with the oil from the gallery (5) of the cylinder head (1) originating lubricating oil.
6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet:, dass das elektromagnetische Drosselventil (9) zur Ventilhub- umschaltung zwischen mindestens zwei Drosselstellungen schaltbar ist, wobei der die Ventilmechanik enthaltende Ventilkörper (14) zumindest teilweise in einer korres- pondierenden Ausnehmung des Führungselements (7) untergebracht ist, wobei ferner die elektromagnetische Betätigungseinheit (15) der Ventilmechanik samt elektrischem Anschluss (16) außerhalb des Führungselements (7) angeordnet ist.6. The device according to claim 1, characterized in that the electromagnetic throttle valve (9) for Ventilhub- switching between at least two throttle positions is switchable, wherein the valve body containing the valve body (14) at least partially in a corre- ponding recess of the guide element (7 ), wherein furthermore the electromagnetic actuating unit (15) of the valve mechanism together with the electrical connection (16) is arranged outside the guide element (7).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das elektromagnetische Drosselventil (9) daneben auch Schmieröl zur Schmierung der Steuerkette liefert, das an einem am Gleitbelag (8) ausmündenden Steigkanal (18) aus- tritt.7. The device according to claim 6, characterized in that the electromagnetic throttle valve (9) also supplies lubricating oil for lubrication of the timing chain, which emerges on a sliding surface (8) emptying riser channel (18).
8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das elektromagnetische Drosselventil (9) mit nur einer Befestigungsschraube (19) lösbar am Führungselement (7) befestigt ist. 8. The device according to claim 1, characterized in that the electromagnetic throttle valve (9) with only one fastening screw (19) is releasably secured to the guide element (7).
PCT/EP2006/005511 2005-06-22 2006-06-09 Device for hydraulically switching valve lift WO2006136294A1 (en)

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DE102005028805.7 2005-06-22

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US5732612A (en) * 1995-08-26 1998-03-31 Hydraulik-Ring Antriebs- Und Steuerungstechnik Gmbh Actuator for a position-adjusting device, preferably for a valve lift adjusting device of motor vehicles
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1291528A (en) * 1969-07-30 1972-10-04 Nissan Motor Valve timing system in an automotive internal combustion engine
US5732612A (en) * 1995-08-26 1998-03-31 Hydraulik-Ring Antriebs- Und Steuerungstechnik Gmbh Actuator for a position-adjusting device, preferably for a valve lift adjusting device of motor vehicles
EP0945598A2 (en) * 1998-03-27 1999-09-29 Yamaha Hatsudoki Kabushiki Kaisha Four stroke internal combustion engine
US6295964B1 (en) * 2000-08-10 2001-10-02 Ford Global Technologies, Inc. End-feed variable cam timing oil supply and control module
EP1201885A1 (en) * 2000-10-25 2002-05-02 Honda Giken Kogyo Kabushiki Kaisha Valve operating control system in engine
US20020059911A1 (en) * 2000-11-22 2002-05-23 Masayuki Takahashi Internal combustion engine
US20030172897A1 (en) * 2002-03-12 2003-09-18 Ford Global Technologies, Inc. Oil feed system for IC engine with variable camshaft timing
DE10307623A1 (en) * 2003-02-22 2004-09-02 Daimlerchrysler Ag Device for relative rotation angle change of a camshaft to a drive wheel of an internal combustion engine

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