EP1503048B1 - Valve drive for an internal combustion engine - Google Patents

Valve drive for an internal combustion engine Download PDF

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Publication number
EP1503048B1
EP1503048B1 EP04010397A EP04010397A EP1503048B1 EP 1503048 B1 EP1503048 B1 EP 1503048B1 EP 04010397 A EP04010397 A EP 04010397A EP 04010397 A EP04010397 A EP 04010397A EP 1503048 B1 EP1503048 B1 EP 1503048B1
Authority
EP
European Patent Office
Prior art keywords
cam
section
valve drive
drive according
sliding
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.)
Expired - Lifetime
Application number
EP04010397A
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German (de)
French (fr)
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EP1503048A1 (en
Inventor
Willi Schultz
Frank Ickinger
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Publication of EP1503048A1 publication Critical patent/EP1503048A1/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
    • 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
    • F01L1/053—Camshafts overhead type
    • 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
    • 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
    • F01L2013/0052—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 with cams provided on an axially slidable sleeve
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a valve drive for an internal combustion engine according to the preamble of patent claim 1.
  • a well-known valve train, EP 0 798 451 B1 for an internal combustion engine comprises a camshaft with a sliding cam device.
  • the sleeve-like arranged on the camshaft sliding cam device is provided with spaced lifting curves and adjacent cam tracks with different cam shapes.
  • the lifting curves work together to adjust the sliding cam device with control pins having actuators and each have both an inlet as well as an outlet area.
  • This valvetrain offers significant potentials to realize with relatively simple means a highly effective variable valve timing for an internal combustion engine, with the aim of improving the latter in terms of performance and consumption.
  • valve train 2 with inlet valves 3 and 4 and exhaust valves 4 and 5 - four-valve technology - is shown, which are each arranged above a combustion chamber of a cylinder, the latter are not shown.
  • the camshaft 6 and the intake valves 3 and 4 cooperate in the manner of a variable valve timing.
  • the camshaft 6 is provided with a sleeve-like disc cam device 10, which is axially movable - in the direction AA - is mounted on the camshaft 6, but rotatably connected to the latter, wherein the camshaft 6 and the Sliding cam device 10 cooperate with the interposition of a positive hub connection 11, which is a Drivenutprofil or a serrated profile in the embodiment - Fig. 3 -.
  • the sliding cam device 10 has three cam tracks 12, 13 and 14 with different cam shapes NI, Nil and NIII, which are combined to form a cam block 15 next to each other, the cam block 15 is bounded on both sides of Hubkurven 16 and 17.
  • control pins 18, 19, 20 and 21 having actuators 22,23,24 and 25 are provided, which are, for example.
  • Electromagnetic or hydraulic genus which is arranged radially to the sliding cam device 10.
  • the control pins 18, 19, 20 or 21 in engagement with the example as U-shaped recesses 26 and 27 Fig. 2 - formed lifting curves 16 and 17.
  • the lift curves 16 and 17 of the cam tracks 12, 13 and 14 carrying sliding cam means 10 have for the engaged control pins 18,19, 20 and 21 different Hubkurvensetechnischen HKS on.
  • the lift cam sections Hks of the lift curves 16 and 17 are displayed in accordance with the outer peripheries of the shift cam device 10 reproducing figures Fig. 4 and 5 formed by an inlet section 28, a first centering section 29, an adjustment section 30 and a second centering section 31, to which an extension section 32 connects.
  • a portion of the recesses 26 and 27 for the control pins 18,19,19 and 21 between the beginning of the inlet section 28 and the end of the second centering 31 is designated AfdS, Fig. 5 -.
  • the inlet section 28 tapers in the direction of the first centering section 29 in the manner of a funnel 33.
  • the funnel 33 is preceded by a first adjusting section 34.
  • the second centering section 31 is followed by a locking section 35 and a second adjusting section 36.
  • a locking device 37 - Fig. 2 - which on an inner circumferential surface 38 of the sliding cam device 10 has three radial circumferential Grooves 39, 40 and 41, wherein the camshaft 6 is provided in the region of the grooves 39, 40 and 41 with a cylindrical recess 42 for a detent ball 43 and a coil spring 44.
  • ring elements 46 and 47 are provided, which protrude beyond the cam block 15.
  • the lifting curves 16 and 17 are arranged.
  • radial webs 48 and 49 of the ring elements 46 and 47 delimit the cam tracks 12, 13 and 14 of the cam block 15.
  • the ring elements 46 and 47 and the cam hub 45 are made in one piece.
  • the roller cam followers 9 and thus also the inlet valves 3 and 4 actuate.
  • the variable valve timing is operated.
  • the actuating elements 22, 23, 24 or 25 are activated and one of the control pins 18, 19, 20 or 21 brought into engagement with the recesses 26 or 27, which due to the Verstellsetation 30 to an axial movement of the sliding cam device 10 in the direction AA and thus to a defined circuit of one of the cam tracks 12,13 or 14 leads.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Description

Die Erfindung betrifft einen Ventiltrieb für eine Brennkraftmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a valve drive for an internal combustion engine according to the preamble of patent claim 1.

Ein bekannter Ventiltrieb, EP 0 798 451 B1 , für eine Brennkraftmaschine umfasst eine Nockenwelle mit einer Schiebenockeneinrichtung. Die hülsenartig auf der Nockenwelle angeordnete Schiebenockeneinrichtung ist mit beabstandeten Hubkurven und nebeneinanderliegenden Nockenbahnen mit unterschiedlichen Nockenformen versehen. Die Hubkurven arbeiten zur Verstellung der Schiebenockeneinrichtung mit Steuerstifte aufweisenden Betätigungselementen zusammen und weisen jeweils sowohl einen Einlauf- wie auch einen Auslaufbereich auf. Dieser Ventiltrieb bietet bedeutende Potentiale, um mit vergleichsweise einfachen Mitteln eine hochwirksame variable Ventilsteuerung für eine Brennkraftmaschine zu realisieren, und zwar mit dem Ziel letztere bezüglich Leistung und Verbrauch zu verbessern.A well-known valve train, EP 0 798 451 B1 for an internal combustion engine comprises a camshaft with a sliding cam device. The sleeve-like arranged on the camshaft sliding cam device is provided with spaced lifting curves and adjacent cam tracks with different cam shapes. The lifting curves work together to adjust the sliding cam device with control pins having actuators and each have both an inlet as well as an outlet area. This valvetrain offers significant potentials to realize with relatively simple means a highly effective variable valve timing for an internal combustion engine, with the aim of improving the latter in terms of performance and consumption.

Es ist Aufgabe der Erfindung einen Ventiltrieb der dargestellten Gattung dahingehend auszugestalten, dass die Schiebenockeneinrichtung eine vorbildliche Konstruktion bildet und Schaitfunktionen der verschiedenen Nockenbahnen, die über Steuerstifte von Betätigungselementen und eine Hubkurve bewerkstelligt werden, rasch, sicher und exakt ausführbar sind.It is an object of the invention to design a valve train of the type shown to the effect that the sliding cam device forms an exemplary construction and Schaitfunktionen the various cam tracks, which are accomplished via control pins of actuators and a lifting curve, are quickly, safely and accurately executed.

Diese Aufgabe wird nach der Erfindung durch die Merkmale des Patentanspruchs 1 gelöst. Weitere, die Erfindung ausgestaltende Merkmale sind in den Unteransprüchen enthalten.This object is achieved according to the invention by the features of patent claim 1. Further, the invention ausgestaltende features are included in the subclaims.

Die mit der Erfindung hauptsächlich erzielten Vorteile sind darin zu sehen, dass dank der Schiebenockeneinrichtung mit den unterschiedliche Hubkurvensektionen aufweisenden Hubkurven ein ruckfreier und folglich funktionsoptimierter Verlauf der Verstellung der besagten Schiebnockeneinrichtung zur Schaltung der verschiedenen Nockenbahnen sichergestellt ist. Dabei sind die verschieden Hubkurvensektionen ohne weiteres in den Hubkurven darstellbar. Die Schiebenockeneinrichtung mit den Ringelementen ist ein mit vertretbaren Mitteln herstellbares Bauteil, wobei in den Ringelelementen sich die Hubkurven leicht einarbeiten lassen.The advantages achieved by the invention are to be seen in the fact that thanks to the sliding cam device with the different Hubkurvensektionen having lifting curves a jerk-free and consequently function optimized course of the adjustment of said sliding cam device for switching the various cam tracks is ensured. The different Hubkurvensektionen are easily in the Lifting curves can be displayed. The sliding cam device with the ring elements is a manufacturable with justifiable means component, wherein in the annulus elements, the lifting curves can be easily incorporated.

Schließlich bietet sich an, eine Schiebennockennabe der Schiebnockeneinrichtung und die Ringelemente aus einem Stück herzustellen, wobei allerdings auch denkbar ist die Schiebenockennabe und die Ringelemente aus mehreren Teilen zusammenzusetzen.Finally, it makes sense to produce a push cam hub of the sliding cam device and the ring elements in one piece, although it is also conceivable to assemble the sliding cam hub and the ring elements of several parts.

In der Zeichnung wird ein Ausführungsbeispiel der Erfindung gezeigt, das nachstehend näher beschrieben wird.In the drawing, an embodiment of the invention is shown, which will be described in more detail below.

Es zeigen

Fig. 1
eine Schrägansicht auf einen Ventiltrieb einer Brennkraftmaschine nach der Erfindung mit einer Schiebenockeneinrichtung,
Fig. 2
einen Längsschnitt durch die Schiebenockeneinrichtung der Fig. 1,
Fig. 3
einen Schnitt nach der Linie III - III der Fig. 2,
Fig. 4
eine Abwicklung von Hubkurven der Schiebenockeneinrichtung,
Fig. 5
eine schematische Einzelheit X der Fig. 4 in größerem Maßstab.
Show it
Fig. 1
3 is an oblique view of a valve train of an internal combustion engine according to the invention with a sliding cam device,
Fig. 2
a longitudinal section through the sliding cam device of Fig. 1 .
Fig. 3
a section along the line III - III of Fig. 2 .
Fig. 4
a development of lifting curves of the sliding cam device,
Fig. 5
a schematic detail of the X Fig. 4 on a larger scale.

Von einer Brennkraftmaschine 1, die zum Einbau in Kraftfahrzeug geeignet ist, ist lediglich ein Ventiltrieb 2 mit Einlassventilen 3 und 4 und Auslassventilen 4 und 5 - Vier-Ventiltechnik - dargestellt, die jeweils oberhalb eines Brennraums eines Zylinders angeordnet sind, letztere sind nicht dargestellt. Eine Nockenwelle 6, angetrieben von einer Kurbelwelle, betätigt die von Ventilfedern 7 und 8 umgebenen Einlassventile 3 und 4, und zwar unter Zwischenschaltung eines Rollenschlepphebels 9. Die Nockenwelle 6 sowie die Einlassventile 3 und 4 wirken nach Art einer variablen Ventilsteuerung zusammen. Hierzu ist die Nockenwelle 6 mit einer büchsenartigen Scheibenockeneinrichtung 10 versehen, die zwar axial beweglich - in Richtung A-A - auf der Nockenwelle 6 gelagert ist, jedoch drehfest mit letzterer verbunden ist, wobei die Nockenwelle 6 und die Schiebenockeneinrichtung 10 unter Zwischenschaltung einer formschlüssigen Nabenverbindung 11 zusammenarbeiten, die im Ausführungsbeispiel ein Vielnutprofil oder ein Kerbzahnprofil ist - Fig. 3 -.From an internal combustion engine 1, which is suitable for installation in motor vehicle, only a valve train 2 with inlet valves 3 and 4 and exhaust valves 4 and 5 - four-valve technology - is shown, which are each arranged above a combustion chamber of a cylinder, the latter are not shown. A camshaft 6, driven by a crankshaft, actuates the intake valves 3 and 4 surrounded by valve springs 7 and 8, with the interposition of a roller cam follower 9. The camshaft 6 and the intake valves 3 and 4 cooperate in the manner of a variable valve timing. For this purpose, the camshaft 6 is provided with a sleeve-like disc cam device 10, which is axially movable - in the direction AA - is mounted on the camshaft 6, but rotatably connected to the latter, wherein the camshaft 6 and the Sliding cam device 10 cooperate with the interposition of a positive hub connection 11, which is a Vielnutprofil or a serrated profile in the embodiment - Fig. 3 -.

Die Schiebenockeneinrichtung 10 weist drei Nockenbahnen 12, 13 und 14 mit unterschiedlichen Nockenformen NI, Nil und NIII auf, die zu einem Nockenblock 15 zusammengefasst nebeneinander liegen, der Nockenblock 15 wird beiderseits von Hubkurven 16 und 17 begrenzt. Zur Verstellung der Schiebenockeneinrichtung 10 auf der Nockenwelle 6 sind Steuerstifte 18, 19,20 und 21 aufweisende Betätigungselemente 22,23,24 und 25 vorgesehen, die bspw. elektromagnetischer oder hydraulischer Gattung sind, die radial zur Schiebenockeneinrichtung 10 angeordnet ist. Je nach Schaltung einer der Nockenbahnen 12, 13 oder 14 sind die Steuerstifte 18, 19, 20 oder 21 im Eingriff mit den z.B. als U-förmige Ausnehmungen 26 und 27 - Fig. 2 - gebildeten Hubkurven 16 und 17.The sliding cam device 10 has three cam tracks 12, 13 and 14 with different cam shapes NI, Nil and NIII, which are combined to form a cam block 15 next to each other, the cam block 15 is bounded on both sides of Hubkurven 16 and 17. For adjusting the sliding cam device 10 on the camshaft 6 control pins 18, 19, 20 and 21 having actuators 22,23,24 and 25 are provided, which are, for example. Electromagnetic or hydraulic genus, which is arranged radially to the sliding cam device 10. Depending on the circuit of one of the cam tracks 12, 13 or 14, the control pins 18, 19, 20 or 21 in engagement with the example as U-shaped recesses 26 and 27 Fig. 2 - formed lifting curves 16 and 17.

Die Hubkurven 16 und 17 der die Nockenbahnen 12, 13 und 14 tragenden Schiebenockeneinrichtung 10 weisen für die in Eingriff befindlichen Steuerstifte 18,19, 20 und 21 verschiedene Hubkurvensektionen Hks auf. Die Hubkurvensektionen Hks der Hubkurven 16 und 17 werden gemäß den äußere Umfänge der Schiebenockeneinrichtung 10 wiedergebenden Figuren Fig. 4 und 5 gebildet, und zwar durch eine Einlaufsektion 28, eine erste Zentriersektion 29, eine Verstellsektion 30 und eine zweite Zentriersektion 31, an die eine Ausfahrsektion 32 anschließt. Ein Bereich der Ausnehmungen 26 und 27 für die Steuerstifte 18,19,19 und 21 zwischen dem Beginn der Einlaufsektion 28 und dem Ende der zweiten Zentrierung 31 ist mit AfdS bezeichnet - Fig. 5 -. Die Einlaufsektion 28 verjüngt sich in Richtung der ersten Zentriersektion 29 nach Art eines Trichters 33. Dem Trichter 33 vorgelagert ist eine erste Einstellsektion 34. Außerdem sind der zweiten Zentriersektion 31 eine Verriegelungssektion 35 und eine zweite Einstellsektion 36 nachgeschaltet. Für die lagerichtige Festlegung der Nockenbahnen 12,13 und 14 zu den Einlassventilen 3 und 4 dient eine Verriegelungseinrichtung 37 - Fig. 2 -, die an einer inneren Umfangsfläche 38 der Schiebenockeneinrichtung 10 drei radiale umlaufende Nuten 39, 40 und 41 umfasst, wobei die Nockenwelle 6 im Bereich der Nuten 39, 40 und 41 mit einer zylindrischen Ausnehmung 42 für eine Rastkugel 43 und einer Spiralfeder 44 versehen ist.The lift curves 16 and 17 of the cam tracks 12, 13 and 14 carrying sliding cam means 10 have for the engaged control pins 18,19, 20 and 21 different Hubkurvensektionen HKS on. The lift cam sections Hks of the lift curves 16 and 17 are displayed in accordance with the outer peripheries of the shift cam device 10 reproducing figures Fig. 4 and 5 formed by an inlet section 28, a first centering section 29, an adjustment section 30 and a second centering section 31, to which an extension section 32 connects. A portion of the recesses 26 and 27 for the control pins 18,19,19 and 21 between the beginning of the inlet section 28 and the end of the second centering 31 is designated AfdS, Fig. 5 -. The inlet section 28 tapers in the direction of the first centering section 29 in the manner of a funnel 33. The funnel 33 is preceded by a first adjusting section 34. In addition, the second centering section 31 is followed by a locking section 35 and a second adjusting section 36. For the correct positioning of the cam tracks 12,13 and 14 to the intake valves 3 and 4 is a locking device 37 - Fig. 2 - Which on an inner circumferential surface 38 of the sliding cam device 10 has three radial circumferential Grooves 39, 40 and 41, wherein the camshaft 6 is provided in the region of the grooves 39, 40 and 41 with a cylindrical recess 42 for a detent ball 43 and a coil spring 44.

Aus Fig. 2 geht hervor, dass beiderseits eines die Nockenbahnen 12, 13 und 14 tragenden Nockenblocks 15, der als eine Nockennabe 45 ausgebildet ist, Ringelemente 46 und 47 vorgesehen sind, die über den Nockenblock 15 hinausragen. In den Ringelementen 46 und 47 sind die Hubkurven 16 und 17 angeordnet. Dabei begrenzen radiale Stege 48 und 49 der Ringelemente 46 und 47 die Nockenbahnen 12, 13 und 14 des Nockenblocks 15. Die Ringelemente 46 und 47 und die Nockennabe 45 sind aus einem Stück hergestellt. Schließlich ist aber auch denkbar, die Ringelemente 46 und 47 und die Nockennabe 45 aus mehreren Teilen zusammenzusetzen.Out Fig. 2 It can be seen that on both sides of a cam block 15 carrying the cam tracks 12, 13 and 14, which is designed as a cam hub 45, ring elements 46 and 47 are provided, which protrude beyond the cam block 15. In the ring elements 46 and 47, the lifting curves 16 and 17 are arranged. In this case, radial webs 48 and 49 of the ring elements 46 and 47 delimit the cam tracks 12, 13 and 14 of the cam block 15. The ring elements 46 and 47 and the cam hub 45 are made in one piece. Finally, however, it is also conceivable to assemble the ring elements 46 and 47 and the cam hub 45 from a plurality of parts.

Nach dem Anlassen der Brennkraftmaschine 1 wird eine der Nockenbahnen 12, 13 oder 14 den Rollenschlepphebel 9 und damit auch die Einlassventile 3 und 4 betätigen. In Abhängigkeit von Parametern bspw. Drehzahl, Last (Fahrpedalsteilung) oder dgl. der Brennkraftmaschine 1 wird die variable Ventilsteuerung betrieben d.h. die Betätigungselemente 22, 23, 24 oder 25 werden aktiviert und einer der Steuerstifte 18, 19,20 oder 21 in Eingriff mit den Ausnehmungen 26 oder 27 gebracht, was aufgrund der Verstellsektion 30 zu einer Axialbewegung der Schiebenockeneinrichtung 10 in Richtung A-A und damit zu einer definierten Schaltung von einer der Nockenbahnen 12,13 oder 14 führt.After starting the internal combustion engine 1, one of the cam tracks 12, 13 or 14, the roller cam followers 9 and thus also the inlet valves 3 and 4 actuate. Depending on parameters such as speed, load (accelerator pedal pitch) or the like of the engine 1, the variable valve timing is operated. the actuating elements 22, 23, 24 or 25 are activated and one of the control pins 18, 19, 20 or 21 brought into engagement with the recesses 26 or 27, which due to the Verstellsektion 30 to an axial movement of the sliding cam device 10 in the direction AA and thus to a defined circuit of one of the cam tracks 12,13 or 14 leads.

Claims (8)

  1. Valve drive for an internal combustion engine, comprising a camshaft with a sliding cam device (10), which sliding cam device (10) has cam tracks which are situated adjacent to one another and have different cam shapes and lift curves (16, 17), which lift curves interact with actuating elements (22, 23, 24 and 25), which have control pins (18, 19, 20 and 21), in order to adjust the sliding cam device (10), with at least one lift curve (16 or 17) of the sliding cam device (10), which carries the cam tracks (12, 13 and 14), being provided with different lift curve sections (Hks) for the control pin (18, 19, 20 and 21), which engages therein, of the associated actuating element (22, 23, 24 and 25), with an adjusting section (30) following a run-in section (28), characterized in that
    - a first centring section (29) is provided between the run-in section (28) and the adjusting section (30), and
    - a second centring section (31) is provided after the adjusting section (30).
  2. Valve drive according to Claim 1, characterized in that a run-out section (32) adjoins the second centring section (31).
  3. Valve drive according to Claim 1, characterized in that the run-in section (28) tapers in the manner of a funnel (33) in the direction of the first centring -section (29).
  4. Valve drive according to Claim 1, characterized in that the sliding cam device (10) is provided, at both sides of a cam block (15), which carries the cam tracks (12, 13 and 14), of a cam hub (45), with annular elements (46 and 47) which are formed in the manner of hollow bodies and which project beyond the cam block (15).
  5. Valve drive according to Claim 4, characterized in that the annular elements (46 and 47) are provided with the lift curves (16 and 17).
  6. Valve drive according to Claim 4, characterized in that radial webs (48 and 49) of the annular elements (46 and 47) delimit the cam tracks (12, 13 and 14) of the cam block (15).
  7. Valve drive according to one of Claims 4 to 6, characterized in that the annular elements (46 and 47) and the cam hub (45) are produced from one piece.
  8. Valve drive according to one of Claims 4-6, characterized in that the annular elements (46 and 47) and the cam hub (45) are assembled from a plurality of parts.
EP04010397A 2003-07-19 2004-05-03 Valve drive for an internal combustion engine Expired - Lifetime EP1503048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10332927 2003-07-19
DE10332927 2003-07-19

Publications (2)

Publication Number Publication Date
EP1503048A1 EP1503048A1 (en) 2005-02-02
EP1503048B1 true EP1503048B1 (en) 2008-10-08

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Country Status (4)

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US (1) US20050011480A1 (en)
EP (1) EP1503048B1 (en)
JP (1) JP4088276B2 (en)
DE (1) DE502004008185D1 (en)

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US20050011480A1 (en) 2005-01-20
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DE502004008185D1 (en) 2008-11-20
JP4088276B2 (en) 2008-05-21

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