WO2013120567A1 - Device for adjusting the valve train of a motor vehicle - Google Patents

Device for adjusting the valve train of a motor vehicle Download PDF

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Publication number
WO2013120567A1
WO2013120567A1 PCT/EP2013/000022 EP2013000022W WO2013120567A1 WO 2013120567 A1 WO2013120567 A1 WO 2013120567A1 EP 2013000022 W EP2013000022 W EP 2013000022W WO 2013120567 A1 WO2013120567 A1 WO 2013120567A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
cam elements
elements
camshaft
valve
Prior art date
Application number
PCT/EP2013/000022
Other languages
German (de)
French (fr)
Inventor
Thomas Stolk
Alexander Von Gaisberg-Helfenberg
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2013120567A1 publication Critical patent/WO2013120567A1/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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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

Definitions

  • the invention relates to a Kraft mecanical negligenceverstellvoroplasty according to the preamble of claim 1.
  • DE 10 2004 021 375 A1 already discloses a motor vehicle valve drive adjusting device with a camshaft which comprises two axially displaceably arranged cam elements which each have at least two cam tracks for adjusting a valve lift of at least one valve of a cylinder, and with at least one actuator device belonging to the Adjustment of the valve lift is provided to at least one of the cam elements of the camshaft to move axially known.
  • the invention is in particular the object of providing a motor vehicle valve drive device, which is particularly variable and thereby formed particularly advantageous adjustable. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.
  • the invention is based on a KraftGermanventiltriebverstellvorraumtage with at least one camshaft, which comprises at least two axially displaceably arranged cam elements which have at least one valve of a cylinder for adjusting a valve lift at least two cam tracks, and with at least one actuator, which provided for adjusting the valve to is to move at least one of the cam elements of the camshaft axially.
  • the motor vehicle valve drive adjusting device has a control and / or regulating unit which is provided to switch the at least two cam elements at least partially independently of one another.
  • the cam elements can be switched particularly advantageous and the Kraft mecanicaltriebverstell- device are made particularly variable.
  • a shaft can be understood, which is provided for actuating a plurality of valves of a motor vehicle internal combustion engine and in each case has at least one cam track for actuating a valve.
  • the camshaft is formed as an intake camshaft and is provided to actuate intake valves, as well as that the camshaft is formed as an exhaust camshaft and is provided to actuate exhaust valves.
  • a “cam element” is to be understood in particular as an element which is arranged in a rotationally fixed manner on a camshaft and is provided for actuating a valve to act on the corresponding valve directly or indirectly with at least one stroke that transmits a torque and / or a rotary motion unchanged.
  • the term “axially” is to be understood to mean in particular axially with respect to a main rotational axis of the cam element.
  • “Axially displaceable” is to be understood in particular as meaning that the cam element is displaceable on the camshaft parallel to the main rotational axis of the cam element between at least two shift positions.
  • a "cam track” is to be understood as meaning, in particular, a region of the cam element which forms a valve actuation curve for valve actuation and / or which defines the valve actuation, in particular a movement triggered by the cam tracks of the cam elements the valve can be understood, in which the valve preferably lifts from its valve seat and thus releases a flow cross-section.
  • An “adjustment of a valve lift” is to be understood as meaning, in particular, a switchover between at least two cam tracks, which define an actuation of the at least one valve, wherein the cam tracks each cause different movements of the valve provides a force for switching the cam elements, in order to switch them from one switching position to another switching position and for this purpose preferably comprise at least one actuator
  • a "control and / or regulating unit” is to be understood as meaning in particular a unit having at least one control unit.
  • a “control unit” is to be understood as meaning, in particular, a unit having a processor unit and a memory unit as well as an operating program stored in the memory unit Bus system, such as in particular a CAN bus system to communicate with each other.
  • Provisioned is to be understood in particular specially programmed, designed and / or equipped.
  • switch at least partially independently is to be understood in particular that a cam element in an operating condition, regardless of whether the other Cam elements can be switched, can be switched. In this case, it may be to the circuit of the cam elements to the same actuator, which can switch the cam elements individually and independently.
  • a circuit of all cam elements in a period of less than 10 camshaft revolutions should be understood in particular as a dependent circuit of the cam elements, which is not independent in the sense of separately switchable cam elements.
  • the Kraftmaschineschwetilventiltriebverstellvorraum comprises at least two cam elements, but also, depending on a number of cylinders of the automotive internal combustion engine, three cam elements, four cam elements, five cam elements, six cam elements, eight cam elements or another, the Professional may appear as meaningful number of cam elements.
  • control and / or regulating unit is provided in at least one operating state to change a switching position of at least one of the cam elements and to maintain a switching position of at least one other cam element.
  • a cam element can be switched particularly advantageously independently of the other cam element.
  • a “switching position of a cam element” should be understood to mean a defined position of the cam element, which occupies the cam element after completion of a circuit and in which a defined cam track engages the corresponding valve in that a cam element is switched from one switching position to another switching position. Under a “maintain switching position” should be understood in particular that the switching position of the cam element remains the same and in particular no switching is made in a different switching position.
  • At least one of the cam elements in at least one operating state has a cam track in engagement, which triggers a different valve lift than another of the cam elements of the camshaft.
  • the motor vehicle valve drive adjusting device has at least one further operating state in which at least one cam element engages a cam track which triggers a different valve lift than a cam track of the same cam element which is engaged in the other operating state.
  • This can a cylinder of the motor vehicle internal combustion engine are operated particularly advantageous variable.
  • the camshaft comprises at least four axially displaceable cam elements, wherein at least two cam elements in at least one operating state each have a cam track in engagement, triggering a different valve lift, than the cam tracks in engagement of the other two cam elements.
  • the actuator device comprises at least one central actuator, which is provided to switch at least two of the cam elements.
  • the cam elements can be switched particularly advantageous.
  • a "central actuator” is to be understood in particular an actuator which is arranged along an axis of rotation of the camshaft centrally on the camshaft and is intended to switch at least two, but preferably four or particularly advantageous all cam elements of the Kraft mecanicaltriebverstellvorraum.
  • the actuator device has a mechanical coding which specifies at least one defined switching sequence of the cam elements.
  • a "mechanical coding” is to be understood in particular as a device which preferably defines a movement of two elements fixedly to one another by a positive and / or non-positive connection and thereby predetermines an always constant defined movement of one or both elements, whereby preferably an always constant, exact one
  • a sequence of successive switching positions of a cam element is to be understood in this context as a "switching sequence".
  • the actuator device is provided to switch the cam elements as a function of at least one operating parameter of the motor vehicle internal combustion engine.
  • an "operating parameter” is to be understood in particular as meaning a parameter of the motor vehicle internal combustion engine, such as, for example, a rotational speed or a power-dependent electrical or electronic signal
  • the actuator device is provided via a value stored on the control and regulation unit for the operating parameter to switch the cam elements.
  • FIG. 1 is a schematic representation of a motor vehicle valve drive adjusting device according to the invention.
  • FIG. 2 shows a characteristic of the motor vehicle valve drive adjusting device according to the invention, which is subdivided into different operating ranges.
  • FIG. 1 shows a motor vehicle valve drive adjusting device according to the invention.
  • the motor vehicle valve drive device is part of a non-illustrated motor vehicle internal combustion engine 34.
  • the motor vehicle internal combustion engine 34 is part of a motor vehicle not shown in detail and has four cylinders not shown in detail. In principle, it is also conceivable that the motor vehicle internal combustion engine 34 has another number of cylinders that appears appropriate to the person skilled in the art.
  • the motor vehicle internal combustion engine 34 has, for each cylinder, two valves not shown in detail, designed as intake valves, and two valves (not shown in detail) designed as exhaust valves.
  • the motor vehicle valve drive apparatus has a camshaft 10 designed as an intake camshaft, which is provided for actuating the valves designed as intake valves, and a camshaft (not illustrated in detail) designed as an exhaust camshaft, which is provided for actuating the valves designed as exhaust valves.
  • a camshaft 10 designed as an intake camshaft will be described below.
  • the camshaft designed as an exhaust camshaft may in principle be of essentially the same design as the intake camshaft described below.
  • camshaft 10 and designed as an exhaust camshaft camshaft, the valves that they operate, act on different strokes, which may differ both in their maximum stroke and in a stroke course.
  • the camshaft 10 is rotatably supported in a cylinder head of the motor vehicle internal combustion engine 34.
  • the camshaft 10 comprises four axially displaceably arranged cam elements 11, 12, 13, 14.
  • the cam elements 11, 12, 13, 14 are rotatably connected via a non-illustrated positive connection with the camshaft 10.
  • the cam elements 11, 12, 13, 14 are displaceable between two switching positions.
  • the first cam member 11 is associated with the first cylinder and the corresponding valves.
  • the second cam member 12 is associated with the second cylinder and the corresponding valves.
  • the third cam member 13 is associated with the third cylinder and the corresponding valves.
  • the fourth cam member 14 is associated with the fourth cylinder and the corresponding valves.
  • the axially displaceable cam elements 11, 12, 13, 14 are provided for actuating and adjusting a valve lift of two valves of a cylinder.
  • the cam elements 11, 12, 13, 14 each have two cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 for each valve .
  • Each of the cam elements 11, 12, 13, 14 has two first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 and two second cam tracks 16, 18, 20, 22, 24, 26, 28, 30.
  • a first cam track 15, 17, 19, 21, 23, 25, 27, 29 and a second cam track 16, 18, 20, 22, 24, 26, 28, 30 are each associated with the same valve of a cylinder and have different valve strokes and Hubverrise on.
  • the first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 and the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30, which are respectively associated with the same valve of the respective cylinder are on the respective cam member 11, 12, 13, 14 respectively adjacent.
  • the first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 of the cam elements 11, 12, 13, 14 are provided for a small valve lift.
  • the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 of the cam elements 11, 12, 13, 14 are provided for a large valve lift.
  • the first cam tracks which are provided for a small valve lift, have a smaller maximum distance from the rotational axis 35 of the camshaft 10 than the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 provided for a large stroke
  • the cam elements 11, 12, 13, 14 each have a different cross-section than in a region of the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30.
  • the first cam tracks of the four cam elements 11, 12, 13, 14 are each formed the same. In each case, there are always two first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 or two second cam tracks 16, 18, 20, 22, 24, 26,
  • first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 of the four cam elements 11, 12, 13, 14 are formed differently.
  • the motor vehicle valve drive adjusting device comprises an actuator device 31, which is provided for adjusting the valve lift to axially displace the cam elements 11, 12, 13, 14 of the camshaft 10.
  • the cam elements 11, 12, 13, 14 By axially displacing the cam elements 11, 12, 13, 14, the cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, which are in engagement with the respective valve, are displaced.
  • the KraftGermanventiltriebverstellvorraum comprises a control and regulating unit 32.
  • the control unit 32 is formed as part of a motor control. In principle, it is also conceivable that the control and regulation unit 32 is formed as a separate unit.
  • the control and regulation unit 32 is provided to switch the at least four cam elements 11, 12, 13, 14 independently of each other.
  • the control unit 32 sends to switch a cam member 11, 12, 13, 14 from one switching position to the other an electrical or electronic signal to the actuator 31, which then the corresponding cam member 11, 12, 13, 14 from a switching position in the other switching position switches.
  • the control unit 32 is provided in at least one operating state to change the switching position of one of the cam elements 11, 12, 13, 14 and the switching position of another No- 11, 12, 13, 14 maintain.
  • control unit 32 changes the valve lift of one cam member 11, 12, 13, 14 from a small to a large valve lift or from a large to a small valve lift, the valve lift of the other non-switched cam member 11, 12, 13 , 14 remains at its recent small or large valve lift. It is conceivable that the control unit 32 in a defined operating state exclusively a cam member 1 1, 12, 13, 14 switches, two cam elements 11, 12, 13, 14, three cam elements
  • cam elements 11, 12, 13, 14 or all four cam elements 11, 12, 13, 14 switches at least substantially simultaneously. In this case, it may be due to the actuator 31 to time differences, which are preferably only up to two camshaft revolutions. In principle, it is also conceivable that all the cam elements 11 to be switched
  • At least one of the four cam elements 11, 12, 13, 14 has a cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 in at least one operating state engaging a valve lift other than an engaged cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 of another of the four cam elements 11, 12, 13, 14.
  • Various cam elements 11, 12, 13, 14 have in an operating state cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 in engagement, which trigger different valve strokes at the respective valves.
  • At least one of the four cam elements 11, 12, 13, 14 is in the first switching position, that is to say it has in each case the first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 in engagement trigger small valve lift, while at least one other of the four cam elements 11, 12, 13, 14 is in the second switching position, so in each case the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 is engaged, the to trigger a large valve lift.
  • two of the four cam members 11, 12, 13, 14 have respective cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 in FIG Engagement that trigger a different valve lift than the engaged cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 of the other two of the four cam elements 11, 12, 13, 14.
  • one of the four cam elements 11, 12, 13, 14 has a cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, which triggers a different valve lift than the cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 of the same cam member 11, 12, 13, 14, which is engaged in the other operating state.
  • the actuator device 31 comprises a central actuator 33, which is provided to switch all four cam elements 11, 12, 13, 14. In principle, it is also conceivable that the actuator device 31 comprises two actuators 33 which are each provided to switch two of the four cam elements 11, 12, 13, 14.
  • the actuator device 31 for switching each of the cam elements 11, 12, 13, 14 has a separate actuator 33, which in each case exclusively switches the cam element 11, 12, 13, 14 assigned to it.
  • any other arrangement and / or number of actuators 33 that appears appropriate to a person skilled in the art is conceivable in order to switch the cam elements 11, 12, 13, 14. It is also possible to combine actuators which merely switch one cam element 11, 12, 13, 14 and actuators which switch a plurality of cam elements 11, 12, 13, 14.
  • the KraftGermanventiltriebverstellvorraum has, as shown in Figure 2, five different operating areas 36, 37, 38, 39, 40.
  • a speed of the motor vehicle internal combustion engine 34 is plotted on the abscissa 41 and an output of the motor vehicle internal combustion engine 34 is plotted on the ordinate 42.
  • the motor vehicle valve drive adjusting device it is also conceivable, of course, for the motor vehicle valve drive adjusting device to have another number of operating areas 36, 37, 38, 39, 40 that appears appropriate to the person skilled in the art.
  • the various operating regions 36, 37, 38, 39, 40 are associated with a power-rpm range of the automotive internal combustion engine 34.
  • the motor vehicle internal combustion engine 34 is in the first operating range 36. Above the defined first power 43 and below a second defined power 45, or above the first defined speed 44 and below a second one
  • the third operating range 38 is limited by the second defined power 45, the second defined speed 46, and a third defined power 47 and a third defined speed 48.
  • the fourth operating range 39 is limited by the third defined power 47, the third defined speed 48 and a fourth defined power 49 and a fourth defined speed 50.
  • the fifth operating range 40 is limited by the fourth defined power 49, the fourth defined speed 50 and a maximum power 51 and maximum speed 52.
  • the motor vehicle valve drive adjusting device has a different combination of switching positions of the cam elements 11, 12, 13, 14.
  • the cam elements 11, 12, 13, 14 are switched to the same switching position.
  • the cam elements 11, 12, 13, 14 are each in their first switching position and actuate the respective valves each with a small valve lift.
  • the first three cam elements 11, 12, 13 are connected in the first switching position and the fourth cam element 14 in the second switching position.
  • control and regulating unit 32 switches the fourth cam member 14 in a transition from the first operating region 36 in the second operating region 37 by means of the actuator 31 from the first to the second switching position and thus changes the valve lifts the actuated by the fourth cam member 14 valves of fourth cylinder from the small valve lift to the large valve lift.
  • the third operating region 38 both the second cam element 12 and the third cam element 13 in the first switching position and the first cam element 11 and the fourth cam element 14 in the second switching position.
  • control and regulating unit 32 switches the first cam element 11 in a transition from the second operating region 37 in the third operating range 38 by means of the actuator 31 from the first switching position to the second switching position and thus changes the valve lifts the actuated by the first cam member 11 valves of the first cylinder from the small valve lift to the large valve lift.
  • the fourth operating region 39 only the third cam element 13 is in the first switching position.
  • the first cam member 11, the second cam member 12 and the fourth cam member 14 are in the fourth operating range 39 in the second shift position.
  • control and regulating unit 32 switches the second cam member 12 at a transition from the third operating region 38 in the fourth operating region 39 by means of the actuator 31 from the first switching position to the second switching position and thus changes the valve strokes of the actuated by the first cam member 1 1 Valves of the second cylinder from the small valve lift to the large valve lift.
  • all cam elements 11, 12, 13, 14 are switched to the same switching position.
  • the cam elements 11, 12, 13, 14 are each in their second switching position and actuate the respective valves in each case with their large valve lift.
  • the control and regulating unit 32 switches the third cam member 13 at a transition from the fourth operating region 39 in the fifth operating region 40 by means of the actuator 31 from the first switching position to the second switching position and thus changes the valve lifts the actuated by the third cam member 13 valves of the third cylinder from the small valve lift to the large valve lift.
  • a transition from a higher operating range 37, 38, 39, 40 to the Next smaller operating range 36, 37, 38, 39 is analogous to the corresponding transition from the lower operating range 36, 37, 38, 39 in the higher operating range 37, 38, 39, 40.
  • the control unit 32 switches at a transition from the second operating region 37 into the first operating region 36, the fourth cam element 14 from the second switching position into the first switching position.
  • individual operating areas 36, 37, 38, 39, 40 are exposed in which, for example, a circuit of the corresponding cam element 11, 12, 13, 14 is temporarily suspended and, for example, only at a transition to the corresponding next or after next operating range 36, 37, 38, 39, 40 is performed. It is conceivable that the control and regulation unit 32 individual operating areas 36, 37, 38, 39, 40 or the circuit of the corresponding cam elements 11, 12, 13, 14 in the individual operating areas 36, 37, 38, 39, 40 on Reason of engine parameters, such as a load torque or the like, exposes.
  • control and regulating unit 32 would, for example, switch both the first cam element 11 and the fourth cam element 14 in each case from the first switching position to the second switching position in a transition from the first operating region 36 into the second operating region 37, thus changing the valve strokes of Valves of the first and fourth cylinders operated by the first cam member 11 and the fourth cam member 14, respectively, from the small valve lift to the large valve lift.
  • the actuator device 31 has a mechanical coding, which defines a defined switching sequence of the cam elements 11, 12, 13, 14. Due to the mechanical coding of the actuator device 31, a switching sequence of the cam elements 11, 12, 13, 14 is fixed and a circuit of the individual cam elements 11, 12, 13, 14 always follows a fixed pattern. The individual switching positions of the individual cam elements 11, 12, 13, 14 in the various operating regions 36, 37, 38, 39, 40 are predetermined by the mechanical coding. On the switching position of a cam member 11, 12, 13, 14 follows in a next operating range 36, 37, 38, 39, 40 always the same switching position. Thus, a switching sequence of the first cam element 11, which is assigned to the first cylinder, for example, first switching position, first Shift position, second shift position, second shift position, second shift position amount.
  • the control and regulating unit 32 In a circuit from the one operating region 36, 37, 38, 39, 40 into an adjacent operating region 36, 37, 38, 39, 40, the control and regulating unit 32 outputs only a signal for switching to the actuator device 31 and a correct circuit the cam elements 11, 12, 13, 14 is predetermined by the mechanical coding. A malfunction or failure of a circuit of the cam elements 1 1, 12, 13, 14 is excluded. There are always defined switching positions of the cam elements 11, 12, 13, 14 before.
  • the actuator device 31 is provided to switch the cam elements 11, 12, 13, 14 as a function of at least one operating parameter of the motor vehicle internal combustion engine 34.
  • the control unit 32 outputs a signal for switching the corresponding cam elements 11, 12, 13, 14 when exceeding a defined speed or a defined power of the motor vehicle engine 34, which separate two operating areas 36, 37, 38, 39, 40 from each other by means of the actuator device 31.

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

Abstract

The invention relates to a device for adjusting the valve train of a motor vehicle having at least one cam shaft (10), which comprises at least two cam elements (11, 12, 13, 14) arranged such that said cam elements are axially slidable, said cam elements each being provided with at least two cam tracks (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30) for adjusting a valve lift of at least one valve of a cylinder, and at least one actuator device (31), which is designed to axially move at least one of the cam elements (11, 12, 13, 14) of the cam shaft (10) for adjusting the valve lift. According to the invention, the device for adjusting the valve train of a motor vehicle is provided with at least one control and/or regulating unit (32) configured to switch the at least two cam elements (11, 12, 13, 14) independently from one another, at least in part.

Description

Kraftfahrzeugventiltriebverstellvorrichtung  Kraftfahrzeugventiltriebverstellvorrichtung
Die Erfindung betrifft eine Kraftfahrzeugventiltriebverstellvorrichtung nach dem Oberbegriff des Anspruchs 1. The invention relates to a Kraftfahrzeugventiltriebverstellvorrichtung according to the preamble of claim 1.
Aus der DE 10 2004 021 375 A1 ist bereits eine Kraftfahrzeugventiltriebverstellvorrichtung mit einer Nockenwelle, die zwei axial verschiebbar angeordnete Nockenelemente um- fasst, die zur Verstellung eines Ventilhubs zumindest eines Ventils eines Zylinders jeweils zumindest zwei Nockenspuren aufweisen, und mit zumindest einer Aktuatorvorrichtung, die zur Verstellung des Ventilhubs dazu vorgesehen ist, zumindest eines der Nockenelemente der Nockenwelle axial zu verschieben, bekannt. DE 10 2004 021 375 A1 already discloses a motor vehicle valve drive adjusting device with a camshaft which comprises two axially displaceably arranged cam elements which each have at least two cam tracks for adjusting a valve lift of at least one valve of a cylinder, and with at least one actuator device belonging to the Adjustment of the valve lift is provided to at least one of the cam elements of the camshaft to move axially known.
Der Erfindung liegt insbesondere die Aufgabe zugrunde, eine Kraftfahrzeugventiltriebvorrichtung bereitzustellen, die besonders variabel und dadurch insbesondere vorteilhaft einstellbar ausgebildet ist. Sie wird gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst. Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen. The invention is in particular the object of providing a motor vehicle valve drive device, which is particularly variable and thereby formed particularly advantageous adjustable. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.
Die Erfindung geht aus von einer Kraftfahrzeugventiltriebverstellvorrichtung mit zumindest einer Nockenwelle, die zumindest zwei axial verschiebbar angeordnete Nockenelemente umfasst, die zur Verstellung eines Ventilhubs zumindest eines Ventils eines Zylinders jeweils zumindest zwei Nockenspuren aufweisen, und mit zumindest einer Aktuatorvorrichtung, die zur Verstellung des Ventilhubs dazu vorgesehen ist, zumindest eines der Nockenelemente der Nockenwelle axial zu verschieben. The invention is based on a Kraftfahrzeugventiltriebverstellvorrichtung with at least one camshaft, which comprises at least two axially displaceably arranged cam elements which have at least one valve of a cylinder for adjusting a valve lift at least two cam tracks, and with at least one actuator, which provided for adjusting the valve to is to move at least one of the cam elements of the camshaft axially.
Es wird vorgeschlagen, dass die Kraftfahrzeugventiltriebverstellvorrichtung eine Steuer- und/oder Regeleinheit aufweist, die dazu vorgesehen ist, die zumindest zwei Nockenelemente zumindest teilweise unabhängig voneinander zu schalten. Dadurch können die Nockenelemente besonders vorteilhaft geschaltet und die Kraftfahrzeugventiltriebverstell- vorrichtung besonders variabel ausgestaltet werden. Unter einer„Nockenwelle" soll dabei insbesondere eine Welle verstanden werden, die zur Betätigung mehrerer Ventile einer Kraftfahrzeugbrennkraftmaschine vorgesehen ist und zur Betätigung eines Ventils jeweils zumindest eine Nockenspur aufweist. Dabei ist es sowohl denkbar, dass die Nockenwelle als Einlassnockenwelle ausgebildet und dazu vorgesehen ist, Einlassventile zu betätigen, als auch, dass die Nockenwelle als Auslassnockenwelle ausgebildet und dazu vorgesehen ist, Auslassventile zu betätigen. Unter einem„Nockenelement" soll insbesondere ein Element verstanden werden, das drehfest auf einer Nockenwelle angeordnet und zur Betätigung eines Ventils dazu vorgesehen ist, das entsprechende Ventil direkt oder indirekt mit zumindest einem Hub zu beaufschlagen. Unter„drehfest" soll insbesondere eine Verbindung verstanden werden, die ein Drehmoment und/oder eine Drehbewegung unverändert überträgt. Unter„axial" soll insbesondere axial in Bezug auf eine Hauptrotationsachse des Nockenelements verstanden werden. Unter„axial verschiebbar" soll dabei insbesondere verstanden werden, dass das Nockenelement auf der Nockenwelle, parallel zu der Hauptrotationsachse des Nockenelements zwischen zumindest zwei Schaltstellungen verschiebbar ist. Unter einer„Nockenspur" soll insbesondere ein auf dem Umfang des Nockenelements verlaufender Bereich des Nockenelements verstanden werden, der eine Ventilbetätigungskurve zur Ventilbetätigung ausbildet und/oder der die Ventilbetätigung definiert. Unter einem„Ventilhub" soll dabei insbesondere eine durch die Nockenspuren der Nockenelemente ausgelöste Bewegung des Ventils verstanden werden, bei dem sich das Ventil vorzugsweise aus seinem Ventilsitz hebt und so einen Strömungsquerschnitt freigibt. Unter einer„Verstellung eines Ventilhubs" soll insbesondere eine Umschaltung zwischen zumindest zwei Nockenspuren, die eine Betätigung des zumindest einen Ventils definieren, verstanden werden, wobei die Nockenspuren jeweils unterschiedliche Bewegungen des Ventils hervorrufen. Unter einer Aktuatorvorrichtung soll dabei insbesondere eine Vorrichtung verstanden werden, die eine Kraft zum Schalten der Nockenelemente bereitstellt, um diese von einer Schaltstellung in eine andere Schaltstellung zu schalten und dazu vorzugsweise zumindest einen Aktuator aufweisen. Unter einer„Steuer- und/oder Regeleinheit" soll insbesondere eine Einheit mit zumindest einem Steuergerät verstanden werden. Unter einem„Steuergerät" soll insbesondere eine Einheit mit einer Prozessoreinheit und mit einer Speichereinheit sowie mit einem in der Speichereinheit gespeicherten Betriebsprogramm verstanden werden. Grundsätzlich kann die Steuer- und/oder Regeleinheit mehrere untereinander verbundene Steuergeräte aufweisen, die vorzugsweise dazu vorgesehen sind, über ein Bus-System, wie insbesondere ein CAN- Bus-System, miteinander zu kommunizieren. Unter„vorgesehen" soll insbesondere speziell programmiert, ausgelegt und/oder ausgestattet verstanden werden. Unter„zumindest teilweise unabhängig voneinander schalten" soll dabei insbesondere verstanden werden, dass ein Nockenelement in einem Betriebszustand unabhängig davon, ob die anderen Nockenelemente geschaltet werden, geschaltet werden kann. Dabei kann es sich zur Schaltung der Nockenelemente um den selben Aktuator handeln, der die Nockenelemente einzeln und unabhängig voneinander schalten kann. Eine Schaltung sämtlicher Nockenelemente in einem Zeitraum kleiner 10 Nockenwellenumdrehungen soll dabei insbesondere als eine abhängige Schaltung der Nockenelemente verstanden werden, die nicht unabhängig im Sinne von getrennt voneinander schaltbaren Nockenelementen ist. Unter „zumindest zwei Nockenelementen" soll insbesondere verstanden werden, dass die Kraft- fahrzeugventiltriebverstellvorrichtung zumindest zwei Nockenelemente umfasst, aber auch, abhängig von einer Zylinderzahl der Kraftfahrzeugbrennkraftmaschine, drei Nockenelemente, vier Nockenelemente, fünf Nockenelemente, sechs Nockenelemente, acht Nockenelemente oder eine andere, dem Fachmann als sinnvoll erscheinende Anzahl an Nockenelementen umfassen kann. It is proposed that the motor vehicle valve drive adjusting device has a control and / or regulating unit which is provided to switch the at least two cam elements at least partially independently of one another. Thereby, the cam elements can be switched particularly advantageous and the Kraftfahrzeugventiltriebverstell- device are made particularly variable. Under a "camshaft" is intended In particular, a shaft can be understood, which is provided for actuating a plurality of valves of a motor vehicle internal combustion engine and in each case has at least one cam track for actuating a valve. It is also conceivable that the camshaft is formed as an intake camshaft and is provided to actuate intake valves, as well as that the camshaft is formed as an exhaust camshaft and is provided to actuate exhaust valves. A "cam element" is to be understood in particular as an element which is arranged in a rotationally fixed manner on a camshaft and is provided for actuating a valve to act on the corresponding valve directly or indirectly with at least one stroke that transmits a torque and / or a rotary motion unchanged. The term "axially" is to be understood to mean in particular axially with respect to a main rotational axis of the cam element. "Axially displaceable" is to be understood in particular as meaning that the cam element is displaceable on the camshaft parallel to the main rotational axis of the cam element between at least two shift positions. A "cam track" is to be understood as meaning, in particular, a region of the cam element which forms a valve actuation curve for valve actuation and / or which defines the valve actuation, in particular a movement triggered by the cam tracks of the cam elements the valve can be understood, in which the valve preferably lifts from its valve seat and thus releases a flow cross-section. An "adjustment of a valve lift" is to be understood as meaning, in particular, a switchover between at least two cam tracks, which define an actuation of the at least one valve, wherein the cam tracks each cause different movements of the valve provides a force for switching the cam elements, in order to switch them from one switching position to another switching position and for this purpose preferably comprise at least one actuator A "control and / or regulating unit" is to be understood as meaning in particular a unit having at least one control unit. A "control unit" is to be understood as meaning, in particular, a unit having a processor unit and a memory unit as well as an operating program stored in the memory unit Bus system, such as in particular a CAN bus system to communicate with each other. "Provided" is to be understood in particular specially programmed, designed and / or equipped. Under "switch at least partially independently" is to be understood in particular that a cam element in an operating condition, regardless of whether the other Cam elements can be switched, can be switched. In this case, it may be to the circuit of the cam elements to the same actuator, which can switch the cam elements individually and independently. A circuit of all cam elements in a period of less than 10 camshaft revolutions should be understood in particular as a dependent circuit of the cam elements, which is not independent in the sense of separately switchable cam elements. By "at least two cam elements" is to be understood in particular that the Kraftzeugzeugventilventiltriebverstellvorrichtung comprises at least two cam elements, but also, depending on a number of cylinders of the automotive internal combustion engine, three cam elements, four cam elements, five cam elements, six cam elements, eight cam elements or another, the Professional may appear as meaningful number of cam elements.
Weiter wird vorgeschlagen, dass die Steuer- und/oder Regeleinheit in zumindest einem Betriebszustand dazu vorgesehen ist, eine Schaltstellung zumindest eines der Nockenelemente zu verändern und eine Schaltstellung zumindest eines anderen Nockenelements aufrechtzuerhalten. Dadurch kann ein Nockenelement besonders vorteilhaft unabhängig von dem anderen Nockenelement geschaltet werden. Unter einer„Schaltstellung eines Nockenelements" soll dabei eine definierte Position des Nockenelements verstanden werden, die das Nockenelement nach Vollenden einer Schaltung einnimmt und in dem eine definierte Nockenspur mit dem entsprechenden Ventil in Eingriff steht. Unter eine„Schaltstellung zu verändern" soll insbesondere verstanden werden, dass ein Nockenelement von einer Schaltstellung in eine andere Schaltstellung geschaltet wird. Unter eine „Schaltstellung aufrechtzuerhalten" soll insbesondere verstanden werden, dass die Schaltstellung des Nockenelements gleich bleibt und insbesondere keine Schaltung in eine andere Schaltstellung vorgenommen wird. It is further proposed that the control and / or regulating unit is provided in at least one operating state to change a switching position of at least one of the cam elements and to maintain a switching position of at least one other cam element. As a result, a cam element can be switched particularly advantageously independently of the other cam element. A "switching position of a cam element" should be understood to mean a defined position of the cam element, which occupies the cam element after completion of a circuit and in which a defined cam track engages the corresponding valve in that a cam element is switched from one switching position to another switching position. Under a "maintain switching position" should be understood in particular that the switching position of the cam element remains the same and in particular no switching is made in a different switching position.
Des Weiteren wird vorgeschlagen, dass zumindest eines der Nockenelemente in zumindest einem Betriebszustand eine Nockenspur in Eingriff hat, die einen anderen Ventilhub auslöst als ein anderes der Nockenelemente der Nockenwelle. Dadurch kann die Kraftfahrzeugbrennkraftmaschine besonders variabel betrieben werden. Furthermore, it is proposed that at least one of the cam elements in at least one operating state has a cam track in engagement, which triggers a different valve lift than another of the cam elements of the camshaft. As a result, the motor vehicle internal combustion engine can be operated in a particularly variable manner.
Zudem wird vorgeschlagen, dass die Kraftfahrzeugventiltriebverstellvorrichtung zumindest einen weiteren Betriebszustand aufweist, in dem zumindest ein Nockenelement eine Nockenspur in Eingriff hat, die einen anderen Ventilhub auslöst als eine Nockenspur des selben Nockenelements, die in dem anderen Betriebszustand in Eingriff ist. Dadurch kann ein Zylinder der Kraftfahrzeugbrennkraftmaschine besonders vorteilhaft variabel betrieben werden. In addition, it is proposed that the motor vehicle valve drive adjusting device has at least one further operating state in which at least one cam element engages a cam track which triggers a different valve lift than a cam track of the same cam element which is engaged in the other operating state. This can a cylinder of the motor vehicle internal combustion engine are operated particularly advantageous variable.
Weiterhin wird vorgeschlagen, dass die Nockenwelle zumindest vier axial verschiebbare Nockenelemente umfasst, wobei zumindest zwei Nockenelemente in zumindest einem Betriebszustand jeweils eine Nockenspur in Eingriff haben, die einen anderen Ventilhub auslösen, als die in Eingriff befindlichen Nockenspuren der anderen zwei Nockenelemente. Dadurch kann eine besonders vorteilhafte Kraftfahrzeugventiltriebverstellvorrichtung für eine vierzylindrige Kraftfahrzeugbrennkraftmaschine bereitgestellt werden. Furthermore, it is proposed that the camshaft comprises at least four axially displaceable cam elements, wherein at least two cam elements in at least one operating state each have a cam track in engagement, triggering a different valve lift, than the cam tracks in engagement of the other two cam elements. Thereby, a particularly advantageous Kraftfahrzeugventiltriebverstellvorrichtung for a four-cylinder automotive internal combustion engine can be provided.
Femer wird vorgeschlagen, dass die Aktuatorvorrichtung zumindest einen zentralen Ak- tuator umfasst, der dazu vorgesehen ist, zumindest zwei der Nockenelemente zu schalten. Dadurch können die Nockenelemente besonders vorteilhaft geschaltet werden. Furthermore, it is proposed that the actuator device comprises at least one central actuator, which is provided to switch at least two of the cam elements. As a result, the cam elements can be switched particularly advantageous.
Unter einem„zentralen Aktuator" soll insbesondere ein Aktuator verstanden werden, der entlang einer Rotationsachse der Nockenwelle zentral an der Nockenwelle angeordnet und dazu vorgesehen ist, zumindest zwei, vorzugsweise aber vier oder besonders vorteilhaft alle Nockenelemente der Kraftfahrzeugventiltriebverstellvorrichtung zu schalten. A "central actuator" is to be understood in particular an actuator which is arranged along an axis of rotation of the camshaft centrally on the camshaft and is intended to switch at least two, but preferably four or particularly advantageous all cam elements of the Kraftfahrzeugventiltriebverstellvorrichtung.
Des Weiteren wird vorgeschlagen, dass die Aktuatorvorrichtung eine mechanische Codierung aufweist, die zumindest eine definierte Schaltabfolge der Nockenelemente vorgibt. Dadurch können die Nockenelemente besonders einfach geschaltet werden und insbesondere die Schaltabfolge sicher eingehalten werden. Unter einer„mechanischen Codierung" soll insbesondere eine Vorrichtung verstanden werden, die vorzugsweise durch einen Form- und/oder Kraftschluss eine Bewegung zweier Elemente fest zueinander definiert und dadurch eine immer gleichbleibende definierte Bewegung eines oder beider Elemente vorgibt, wodurch vorzugsweise eine immer gleichbleibende, exakte Bewegungsabfolge erreicht werden kann. Unter einer„Schaltabfolge" soll dabei insbesondere eine Abfolge von aufeinander folgenden Schaltstellungen eines Nockenelements verstanden werden. Furthermore, it is proposed that the actuator device has a mechanical coding which specifies at least one defined switching sequence of the cam elements. As a result, the cam elements can be switched particularly easily and in particular the switching sequence can be safely maintained. A "mechanical coding" is to be understood in particular as a device which preferably defines a movement of two elements fixedly to one another by a positive and / or non-positive connection and thereby predetermines an always constant defined movement of one or both elements, whereby preferably an always constant, exact one A sequence of successive switching positions of a cam element is to be understood in this context as a "switching sequence".
Weiterhin wird vorgeschlagen, dass die Aktuatorvorrichtung dazu vorgesehen ist, die Nockenelemente in Abhängigkeit von zumindest einem Betriebsparameter der Kraftfahrzeugbrennkraftmaschine zu schalten. Dadurch kann eine Schaltung der Nockenelemente besonders vorteilhaft und einfach ausgelöst werden. Unter einem„Betriebsparameter" soll insbesondere ein von einem Parameter der Kraftfahrzeugbrennkraftmaschine, wie beispielsweise ein drehzahl- oder ein leistungsabhängiges elektrisches oder elektronisches Signal verstanden werden. Unter„in Abhängigkeit eines Betriebsparametes zu schalten" soll insbesondere verstanden werden, dass die Aktuatorvorrichtung bei einem von der Steuer- und Regeleinheit erkannten Überschreiten eines Betriebsparameters über einen auf der Steuer- und Regeleinheit hinterlegten Wert für den Betriebsparameter dazu vorgesehen ist, die Nockenelemente zu schalten. Furthermore, it is proposed that the actuator device is provided to switch the cam elements as a function of at least one operating parameter of the motor vehicle internal combustion engine. As a result, a circuit of the cam elements can be triggered particularly advantageously and simply. An "operating parameter" is to be understood in particular as meaning a parameter of the motor vehicle internal combustion engine, such as, for example, a rotational speed or a power-dependent electrical or electronic signal In particular, it should be understood that when the operating parameter is exceeded by an operating parameter detected by the control and regulation unit, the actuator device is provided via a value stored on the control and regulation unit for the operating parameter to switch the cam elements.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In den Zeichnungen ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnungen, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen. Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Dabei zeigen: Showing:
Fig. 1 eine schematische Darstellung einer erfindungsgemäßen Kraftfahrzeug- ventiltriebverstellvorrichtung und  1 is a schematic representation of a motor vehicle valve drive adjusting device according to the invention and
Fig. 2 ein Kennfled der erfindungsgemäßen Kraftfahrzeugventiltriebverstellvor- richtung, das in verschiedene Betriebsbereiche unterteilt ist. 2 shows a characteristic of the motor vehicle valve drive adjusting device according to the invention, which is subdivided into different operating ranges.
Die Figur 1 zeigt eine erfindungsgemäße Kraftfahrzeugventiltriebverstellvorrichtung. Die Kraftfahrzeugventiltriebvorrichtung ist Teil einer nicht näher dargestellten Kraftfahrzeugbrennkraftmaschine 34. Die Kraftfahrzeugbrennkraftmaschine 34 ist Teil eines nicht näher dargestellten Kraftfahrzeugs und weist vier nicht näher dargestellte Zylinder auf. Grundsätzlich ist es auch denkbar, dass die Kraftfahrzeugbrennkraftmaschine 34 eine andere, dem Fachmann als sinnvoll erscheinende Anzahl an Zylindern aufweist. Die Kraftfahrzeugbrennkraftmaschine 34 weist für jeden Zylinder jeweils zwei nicht näher dargestellte, als Einlassventile ausgebildete Ventile und zwei nicht näher dargestellte, als Auslassventile ausgebildete Ventile auf. Grundsätzlich ist es auch denkbar, dass die Kraftfahrzeugbrennkraftmaschine 34 für jeden Zylinder jeweils nur ein Einlassventil und ein Auslassventil, oder eine andere, dem Fachmann als sinnvoll erscheinende Anzahl an Einlass- und/oder Auslassventilen aufweist. Die Kraftfahrzeugventiltriebvorrichtung weist eine als Einlassnockenwelle ausgebildete Nockenwelle 10, die zur Betätigung der als Einlassventile ausgebildeten Ventile vorgesehen ist, und eine nicht näher dargestellte, als Auslassnockenwelle ausgebildete Nockenwelle, die zur Betätigung der als Auslassventile ausgebildeten Ventile vorgesehen ist, auf. Im Folgenden wird aus Übersichtlichkeitsgründen nur die als Einlassnockenwelle ausgebildete Nockenwelle 10 beschrieben. Die als Auslassnockenwelle ausgebildete Nockenwelle kann grundsätzlich im Wesentlichen gleich ausgebildet sein, wie die im Folgenden beschriebene als Einlassnockenwelle aus- gebildete Nockenwelle 10. Dabei können sich die als Einlassnockenwelle ausgebildete Nockenwelle 10 und die als Auslassnockenwelle ausgebildete Nockenwelle die Ventile, die sie betätigen, mit unterschiedlichen Hüben beaufschlagen, die sich sowohl in ihrem Maximalhub als auch in einem Hubverlauf unterscheiden können. Die Nockenwelle 10 ist in einem Zylinderkopf der Kraftfahrzeugbrennkraftmaschine 34 drehbar gelagert. FIG. 1 shows a motor vehicle valve drive adjusting device according to the invention. The motor vehicle valve drive device is part of a non-illustrated motor vehicle internal combustion engine 34. The motor vehicle internal combustion engine 34 is part of a motor vehicle not shown in detail and has four cylinders not shown in detail. In principle, it is also conceivable that the motor vehicle internal combustion engine 34 has another number of cylinders that appears appropriate to the person skilled in the art. The motor vehicle internal combustion engine 34 has, for each cylinder, two valves not shown in detail, designed as intake valves, and two valves (not shown in detail) designed as exhaust valves. In principle, it is also conceivable that the motor vehicle internal combustion engine 34 has for each cylinder only one inlet valve and one outlet valve, or another number of inlet and / or outlet valves that appears appropriate to the person skilled in the art. The motor vehicle valve drive apparatus has a camshaft 10 designed as an intake camshaft, which is provided for actuating the valves designed as intake valves, and a camshaft (not illustrated in detail) designed as an exhaust camshaft, which is provided for actuating the valves designed as exhaust valves. For reasons of clarity, only the camshaft 10 designed as an intake camshaft will be described below. The camshaft designed as an exhaust camshaft may in principle be of essentially the same design as the intake camshaft described below. formed camshaft 10 and designed as an exhaust camshaft camshaft, the valves that they operate, act on different strokes, which may differ both in their maximum stroke and in a stroke course. The camshaft 10 is rotatably supported in a cylinder head of the motor vehicle internal combustion engine 34.
Die Nockenwelle 10 umfasst vier axial verschiebbar angeordnete Nockenelemente 11 , 12, 13, 14. Die Nockenelemente 11 , 12, 13, 14 sind über einen nicht näher dargestellten Formschluss drehfest mit der Nockenwelle 10 verbunden. In einer Axialrichtung, die parallel zu einer Rotationsachse 35 der Nockenwelle 10 verläuft, sind die Nockenelemente 11 , 12, 13, 14 zwischen zwei Schaltstellungen verschiebbar. Grundsätzlich ist es auch denkbar, dass die Nockenelemente 11 , 12, 13, 14 auf eine andere, dem Fachmann als sinnvoll erscheinende Weise mit der Nockenwelle 10 verbunden sind. Das erste Nockenelement 11 ist dem ersten Zylinder und den entsprechenden Ventilen zugeordnet. Das zweite Nockenelement 12 ist dem zweiten Zylinder und den entsprechenden Ventilen zugeordnet. Das dritte Nockenelement 13 ist dem dritten Zylinder und den entsprechenden Ventilen zugeordnet. Das vierte Nockenelement 14 ist dem vierten Zylinder und den entsprechenden Ventilen zugeordnet. Die axial verschiebbaren Nockenelemente 11 , 12, 13, 14 sind zur Betätigung und Verstellung eines Ventilhubs von jeweils zwei Ventilen eines Zylinders vorgesehen. Dazu weisen die Nockenelemente 11 , 12, 13, 14 jeweils zwei Nockenspuren 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 für jeweils ein Ventil auf. Jedes der Nockenelemente 11 , 12, 13, 14 weist zwei erste Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 und zwei zweite Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30 auf. Je eine erste Nockenspur 15, 17, 19, 21 , 23, 25, 27, 29 und eine zweite Nockenspur 16, 18, 20, 22, 24, 26, 28, 30 sind jeweils dem selben Ventil eines Zylinders zugeordnet und weisen unterschiedliche Ventilhübe und Hubverläufe auf. Die ersten Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 und die zweiten Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30, die jeweils dem selben Ventil des jeweiligen Zylinders zugeordnet sind, sind auf dem jeweiligen Nockenelement 11 , 12, 13, 14 jeweils benachbart angeordnet. Die ersten Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 der Nockenelemente 11 , 12, 13, 14 sind für einen kleinen Ventilhub vorgesehen. Die zweiten Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30 der Nockenelemente 11 , 12, 13, 14 sind für einen großen Ventilhub vorgesehen. Dabei weisen die ersten Nockenspuren, die für einen kleinen Ventilhub vorgesehen sind, einen kleineren maximalen Abstand von der Rotationsachse 35 der Nockenwelle 10 auf als die für einen großen Hub vorgesehenen zweiten Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30. In einem Bereich der ersten Nockenspuren weisen die Nockenelemente 11 , 12, 13, 14 jeweils einen anderen Querschnitt auf als in einem Bereich der zweiten Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30. Die ersten Nockenspuren der vier Nockenelemente 11 , 12, 13, 14 sind jeweils gleich ausgebildet. Es sind dabei jeweils immer zwei erste Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 oder zwei zweite Nockenspuren 16, 18, 20, 22, 24, 26,The camshaft 10 comprises four axially displaceably arranged cam elements 11, 12, 13, 14. The cam elements 11, 12, 13, 14 are rotatably connected via a non-illustrated positive connection with the camshaft 10. In an axial direction, which runs parallel to a rotational axis 35 of the camshaft 10, the cam elements 11, 12, 13, 14 are displaceable between two switching positions. In principle, it is also conceivable that the cam elements 11, 12, 13, 14 are connected to the camshaft 10 in another way that appears appropriate to a person skilled in the art. The first cam member 11 is associated with the first cylinder and the corresponding valves. The second cam member 12 is associated with the second cylinder and the corresponding valves. The third cam member 13 is associated with the third cylinder and the corresponding valves. The fourth cam member 14 is associated with the fourth cylinder and the corresponding valves. The axially displaceable cam elements 11, 12, 13, 14 are provided for actuating and adjusting a valve lift of two valves of a cylinder. For this purpose, the cam elements 11, 12, 13, 14 each have two cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 for each valve , Each of the cam elements 11, 12, 13, 14 has two first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 and two second cam tracks 16, 18, 20, 22, 24, 26, 28, 30. Depending on a first cam track 15, 17, 19, 21, 23, 25, 27, 29 and a second cam track 16, 18, 20, 22, 24, 26, 28, 30 are each associated with the same valve of a cylinder and have different valve strokes and Hubverläufe on. The first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 and the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30, which are respectively associated with the same valve of the respective cylinder are on the respective cam member 11, 12, 13, 14 respectively adjacent. The first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 of the cam elements 11, 12, 13, 14 are provided for a small valve lift. The second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 of the cam elements 11, 12, 13, 14 are provided for a large valve lift. The first cam tracks, which are provided for a small valve lift, have a smaller maximum distance from the rotational axis 35 of the camshaft 10 than the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 provided for a large stroke In a region of the first cam tracks, the cam elements 11, 12, 13, 14 each have a different cross-section than in a region of the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30. The first cam tracks of the four cam elements 11, 12, 13, 14 are each formed the same. In each case, there are always two first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 or two second cam tracks 16, 18, 20, 22, 24, 26,
28, 30 eines Nockenelements 11 , 12, 13, 14 zur Betätigung der Ventile eines Zylinders in Eingriff. Grundsätzlich ist es auch denkbar, dass die ersten Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 der vier Nockenelemente 11 , 12, 13, 14 unterschiedlich ausgebildet sind. Grundsätzlich ist es auch denkbar, dass die ersten Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 zur Betätigung des ersten Ventils eines Zylinders und die ersten Nockenspuren 15,28, 30 of a cam member 11, 12, 13, 14 for actuating the valves of a cylinder in engagement. In principle, it is also conceivable that the first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 of the four cam elements 11, 12, 13, 14 are formed differently. In principle, it is also conceivable that the first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 for actuating the first valve of a cylinder and the first cam tracks 15,
17, 19, 21 , 23, 25, 27, 29 zur Betätigung des zweiten Ventils des selben Zylinders, also zwei erste Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 des selben Nockenelements 11 , 12, 13, 14, unterschiedlich ausgestaltet sind. 17, 19, 21, 23, 25, 27, 29 for actuating the second valve of the same cylinder, that is to say two first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 of the same cam element 11, 12, 13, 14, are designed differently.
Zur Verstellung des Ventilhubs umfasst die Kraftfahrzeugventiltriebverstellvorrichtung eine Aktuatorvorrichtung 31 , die zur Verstellung des Ventilhubs dazu vorgesehen ist, die Nockenelemente 11 , 12, 13, 14 der Nockenwelle 10 axial zu verschieben. Durch axiales verschieben der Nockenelemente 11 , 12, 13, 14 werden die mit dem jeweiligen Ventil in Eingriff stehenden Nockenspuren 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28,To adjust the valve lift, the motor vehicle valve drive adjusting device comprises an actuator device 31, which is provided for adjusting the valve lift to axially displace the cam elements 11, 12, 13, 14 of the camshaft 10. By axially displacing the cam elements 11, 12, 13, 14, the cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, which are in engagement with the respective valve, are displaced.
29, 30 verändert. In einer ersten Schaltstellung eines der Nockenelemente 1 1 , 12, 13, 14 sind jeweils die beiden ersten Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 in Eingriff und betätigen das entsprechende Ventil des entsprechenden Zylinders. In der ersten Schaltstellung werden die Ventile der Zylinder mit dem kleinen Ventilhub ausgelenkt. In einer zweiten Schaltstellung eines der Nockenelemente 11 , 12, 13, 14 sind jeweils die beiden zweiten Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30 in Eingriff und betätigen das entsprechende Ventil des entsprechenden Zylinders. In der zweiten Schaltstellung werden die Ventile der Zylinder mit dem großen Ventilhub ausgelenkt. 29, 30 changed. In a first switching position of the cam elements 1 1, 12, 13, 14 are respectively the first two cam tracks 15, 17, 19, 21, 23, 25, 27, 29 in engagement and actuate the corresponding valve of the corresponding cylinder. In the first switching position, the valves of the cylinder are deflected with the small valve lift. In a second switching position of one of the cam elements 11, 12, 13, 14 are respectively the two second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 in engagement and actuate the corresponding valve of the corresponding cylinder. In the second switching position, the valves of the cylinder are deflected with the large valve lift.
Die Kraftfahrzeugventiltriebverstellvorrichtung umfasst eine Steuer- und Regeleinheit 32. Die Steuer- und Regeleinheit 32 ist als Teil einer Motorsteuerung ausgebildet. Grundsätzlich ist es auch denkbar, dass die Steuer- und Regeleinheit 32 als separate Einheit ausgebildet ist. Die Steuer- und Regeleinheit 32 ist dazu vorgesehen, die zumindest vier Nockenelemente 11 , 12, 13, 14 unabhängig voneinander zu schalten. Die Steuer- und Regeleinheit 32 sendet zur Schaltung eines Nockenelements 11 , 12, 13, 14 von einer Schaltstellung in die andere ein elektrisches oder elektronisches Signal an die Aktuatorvorrichtung 31 , die dann das entsprechende Nockenelement 11 , 12, 13, 14 von einer Schaltstellung in die andere Schaltstellung umschaltet. Die Steuer- und Regeleinheit 32 ist in zumindest einem Betriebszustand dazu vorgesehen, die Schaltstellung eines der Nockenelemente 11 , 12, 13, 14 zu verändern und die Schaltstellung eines anderen No- ckenelements 11 , 12, 13, 14 aufrechtzuerhalten. Dadurch verändert die Steuer- und Regeleinheit 32 den Ventilhub des einen Nockenelements 11 , 12, 13, 14 von einem kleinen auf einen großen Ventilhub oder von einem großen auf einen kleinen Ventilhub, wobei der Ventilhub des anderen, nicht umgeschalteten Nockenelements 11 , 12, 13, 14 bei seinem bisherigen kleinen oder großen Ventilhub bleibt. Dabei ist es denkbar, dass die Steuer- und Regeleinheit 32 in einem definierten Betriebszustand ausschließlich ein Nockenelement 1 1 , 12, 13, 14 schaltet, zwei Nockenelemente 11 , 12, 13, 14, drei NockenelementeThe Kraftfahrzeugventiltriebverstellvorrichtung comprises a control and regulating unit 32. The control unit 32 is formed as part of a motor control. In principle, it is also conceivable that the control and regulation unit 32 is formed as a separate unit. The control and regulation unit 32 is provided to switch the at least four cam elements 11, 12, 13, 14 independently of each other. The control unit 32 sends to switch a cam member 11, 12, 13, 14 from one switching position to the other an electrical or electronic signal to the actuator 31, which then the corresponding cam member 11, 12, 13, 14 from a switching position in the other switching position switches. The control unit 32 is provided in at least one operating state to change the switching position of one of the cam elements 11, 12, 13, 14 and the switching position of another No- 11, 12, 13, 14 maintain. Thereby, the control unit 32 changes the valve lift of one cam member 11, 12, 13, 14 from a small to a large valve lift or from a large to a small valve lift, the valve lift of the other non-switched cam member 11, 12, 13 , 14 remains at its recent small or large valve lift. It is conceivable that the control unit 32 in a defined operating state exclusively a cam member 1 1, 12, 13, 14 switches, two cam elements 11, 12, 13, 14, three cam elements
11 , 12, 13, 14 oder alle vier Nockenelemente 11 , 12, 13, 14 zumindest im Wesentlichen zeitgleich schaltet. Dabei kann es durch die Aktuatorvorrichtung 31 zu zeitlichen Unterschieden kommen, die vorzugsweise nur bis zu zwei Nockenwellenumdrehungen betragen. Grundsätzlich ist es auch denkbar, dass alle zu schaltenden Nockenelemente 11 ,11, 12, 13, 14 or all four cam elements 11, 12, 13, 14 switches at least substantially simultaneously. In this case, it may be due to the actuator 31 to time differences, which are preferably only up to two camshaft revolutions. In principle, it is also conceivable that all the cam elements 11 to be switched
12, 13, 14 zeitgleich schalten. 12, 13, 14 switch at the same time.
Zumindest eines der vier Nockenelemente 11 , 12, 13, 14 hat in zumindest einem Betriebszustand eine Nockenspur 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 in Eingriff, die einen anderen Ventilhub auslöst als eine in Eingriff befindliche Nockenspur 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 eines anderen der vier Nockenelemente 11 , 12, 13, 14. Verschiedene Nockenelemente 11 , 12, 13, 14 haben in einem Betriebszustand Nockenspuren 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 in Eingriff, die bei den entsprechenden Ventilen verschiedene Ventilhübe auslösen. So befindet sich in einem Betriebszustand zumindest eins der vier Nockenelemente 1 1 , 12, 13, 14 in der ersten Schaltstellung, hat also jeweils die ersten Nockenspuren 15, 17, 19, 21 , 23, 25, 27, 29 in Eingriff, die einen kleinen Ventilhub auslösen, während sich zumindest ein anderes der vier Nockenelemente 11 , 12, 13, 14 in der zweiten Schaltstellung befindet, also jeweils die zweiten Nockenspuren 16, 18, 20, 22, 24, 26, 28, 30 in Eingriff hat, die einen großen Ventilhub auslösen. In einem anderen Betriebszustand haben zwei der vier Nockenelemente 11 , 12, 13, 14 jeweils Nockenspuren 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 in Eingriff, die einen anderen Ventilhub auslösen als die in Eingriff befindlichen Nockenspuren 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 der anderen zwei der vier Nockenelemente 11 , 12, 13, 14. In einem weiteren Betriebszustand der Kraftfahrzeugventiltriebverstellvorrichtung hat eins der vier Nockenelemente 11 , 12, 13, 14 eine Nockenspur 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 in Eingriff, die einen anderen Ventilhub auslöst als die Nockenspur 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30 des selben Nockenelements 11 , 12, 13, 14, die in dem anderen Betriebszustand in Eingriff ist. Die Aktuatorvorrichtung 31 umfasst einen zentralen Aktuator 33, der dazu vorgesehen ist, alle vier Nockenelemente 11 , 12, 13, 14 zu schalten. Es ist grundsätzlich auch denkbar, dass die Aktuatorvorrichtung 31 zwei Aktuatoren 33 umfasst, die jeweils dazu vorgesehen sind, zwei der vier Nockenelemente 11 , 12, 13, 14 zu schalten. Grundsätzlich ist es auch denkbar, dass die Aktuatorvorrichtung 31 zur Schaltung jedes der Nockenelemente 11 , 12, 13, 14 einen separaten Aktuator 33 aufweist, der jeweils ausschließlich das ihm zugeordnete Nockenelement 11 , 12, 13, 14 schaltet. Grundsätzlich ist auch jede andere, dem Fachmann als sinnvoll erscheinende Anordnung und/oder Anzahl von Aktuatoren 33 denkbar, um die Nockenelemente 11 , 12, 13, 14 zu schalten. Dabei können auch Aktuatoren, die lediglich ein Nockenelement 11 , 12, 13, 14 und Aktuatoren die mehrere Nockenelemente 11 , 12, 13, 14 schalten, kombiniert werden. At least one of the four cam elements 11, 12, 13, 14 has a cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 in at least one operating state engaging a valve lift other than an engaged cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 of another of the four cam elements 11, 12, 13, 14. Various cam elements 11, 12, 13, 14 have in an operating state cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 in engagement, which trigger different valve strokes at the respective valves. Thus, in one operating state, at least one of the four cam elements 11, 12, 13, 14 is in the first switching position, that is to say it has in each case the first cam tracks 15, 17, 19, 21, 23, 25, 27, 29 in engagement trigger small valve lift, while at least one other of the four cam elements 11, 12, 13, 14 is in the second switching position, so in each case the second cam tracks 16, 18, 20, 22, 24, 26, 28, 30 is engaged, the to trigger a large valve lift. In another operating condition, two of the four cam members 11, 12, 13, 14 have respective cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 in FIG Engagement that trigger a different valve lift than the engaged cam tracks 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 of the other two of the four cam elements 11, 12, 13, 14. In another operating state of the motor vehicle valve drive adjusting device, one of the four cam elements 11, 12, 13, 14 has a cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, which triggers a different valve lift than the cam track 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 of the same cam member 11, 12, 13, 14, which is engaged in the other operating state. The actuator device 31 comprises a central actuator 33, which is provided to switch all four cam elements 11, 12, 13, 14. In principle, it is also conceivable that the actuator device 31 comprises two actuators 33 which are each provided to switch two of the four cam elements 11, 12, 13, 14. In principle, it is also conceivable that the actuator device 31 for switching each of the cam elements 11, 12, 13, 14 has a separate actuator 33, which in each case exclusively switches the cam element 11, 12, 13, 14 assigned to it. In principle, any other arrangement and / or number of actuators 33 that appears appropriate to a person skilled in the art is conceivable in order to switch the cam elements 11, 12, 13, 14. It is also possible to combine actuators which merely switch one cam element 11, 12, 13, 14 and actuators which switch a plurality of cam elements 11, 12, 13, 14.
Die Kraftfahrzeugventiltriebverstellvorrichtung weist, wie in Figur 2 dargestellt, fünf verschiedene Betriebsbereiche 36, 37, 38, 39, 40 auf. Auf dem in Figur 2 dargestellten Diagramm ist auf der Abszisse 41 eine Drehzahl der Kraftfahrzeugbrennkraftmaschine 34 und auf der Ordinate 42 eine Leistung der Kraftfahrzeugbrennkraftmaschine 34 aufgetragen. Grundsätzlich ist es natürlich auch denkbar, dass die Kraftfahrzeugventiltriebver- stellvorrichtung eine andere, dem Fachmann als sinnvoll erscheinende Anzahl an Betriebsbereichen 36, 37, 38, 39, 40 aufweist. Die verschiedenen Betriebsbereiche 36, 37, 38, 39, 40 sind einem Leistungs-Drehzahlbereich der Kraftfahrzeugbrennkraftmaschine 34 zugeordnet. Unterhalb einer definierten ersten Leistung 43 und unterhalb einer definierten ersten Drehzahl 44 befindet sich die Kraftfahrzeugbrennkraftmaschine 34 in dem ersten Betriebsbereich 36. Oberhalb der definierten ersten Leistung 43 und unterhalb einer zweiten definierten Leistung 45, bzw. oberhalb der ersten definierten Drehzahl 44 und unterhalb einer zweiten definierten Drehzahl 46 befindet sich die Kraftfahrzeugbrennkraftmaschine 34 in dem zweiten Betriebsbereich 37. Der dritte Betriebsbereich 38 wird von der zweiten definierten Leistung 45, der zweiten definierten Drehzahl 46, sowie einer dritten definierten Leistung 47 und einer dritten definierten Drehzahl 48 begrenzt. Der vierte Betriebsbereich 39 wird von der dritten definierten Leistung 47, der dritten definierten Drehzahl 48 sowie einer vierten definierten Leistung 49 und einer vierten definierten Drehzahl 50 begrenzt. Der fünfte Betriebsbereich 40 wird von der vierten definierten Leistung 49, der vierten definierten Drehzahl 50 sowie einer maximalen Leistung 51 und maximalen Drehzahl 52 begrenzt. Eine Definition der verschiedenen Leistungen 43, 45, 47, 49, 51 und Drehzahlen 44, 46, 48, 50, 52 erfolgt abhängig von der entsprechenden Kraftfahrzeugbrennkraftmaschine 34 und bewegt sich in für den Fachmann als sinnvoll erscheinenden Bereichen. In jedem Betriebsbereich 36, 37, 38, 39, 40 weist die Kraftfahrzeugventiltriebverstellvor- richtung eine andere Kombination an Schaltstellungen der Nockenelemente 11 , 12, 13, 14 auf. In dem ersten Betriebsbereich 36 sind alle Nockenelemente 11 , 12, 13, 14 in die gleiche Schaltstellung geschaltet. In dem ersten Betriebsbereich 36 sind die Nockenelemente 11 , 12, 13, 14 jeweils in ihrer ersten Schaltstellung und betätigen die jeweiligen Ventile jeweils mit einem kleinen Ventilhub. In dem zweiten Betriebsbereich 37 sind die ersten drei Nockenelemente 11 , 12, 13 in die erste Schaltstellung und das vierte Nockenelement 14 in die zweite Schaltstellung geschaltet. Dazu schaltet die Steuer- und Regeleinheit 32 das vierte Nockenelement 14 bei einem Übergang von dem ersten Betriebsbereich 36 in den zweiten Betriebsbereich 37 mittels der Aktuatorvorrichtung 31 von der ersten in die zweite Schaltstellung und verändert so die Ventilhübe der von dem vierten Nockenelement 14 betätigten Ventile des vierten Zylinders von dem kleinen Ventilhub auf den großen Ventilhub. In dem dritten Betriebsbereich 38 sind sowohl das zweite Nockenelement 12 als auch das dritte Nockenelement 13 in der ersten Schaltstellung und das erste Nockenelement 11 als auch das vierte Nockenelement 14 in der zweiten Schaltstellung. Dazu schaltet die Steuer- und Regeleinheit 32 das erste Nockenelement 11 bei einem Übergang von dem zweiten Betriebsbereich 37 in den dritten Betriebsbereich 38 mittels der Aktuatorvorrichtung 31 von der ersten Schaltstellung in die zweite Schaltstellung und verändert so die Ventilhübe der von dem ersten Nockenelement 11 betätigten Ventile des ersten Zylinders von dem kleinen Ventilhub auf den großen Ventilhub. In dem vierten Betriebsbereich 39 ist ausschließlich das dritte Nockenelement 13 in der ersten Schaltstellung. Das erste Nockenelement 11 , das zweite Nockenelement 12 und das vierte Nockenelement 14 sind in dem vierten Betriebsbereich 39 in der zweiten Schaltstellung. Dazu schaltet die Steuer- und Regeleinheit 32 das zweite Nockenelement 12 bei einem Übergang von dem dritten Betriebsbereich 38 in den vierten Betriebsbereich 39 mittels der Aktuatorvorrichtung 31 von der ersten Schaltstellung in die zweite Schaltstellung und verändert so die Ventilhübe der von dem ersten Nockenelement 1 1 betätigten Ventile des zweiten Zylinders von dem kleinen Ventilhub auf den großen Ventilhub. In dem fünften Betriebsbereich 40 sind alle Nockenelemente 11 , 12, 13, 14 in die gleiche Schaltstellung geschaltet. In dem fünften Betriebsbereich 40 sind die Nockenelemente 11 , 12, 13, 14 jeweils in ihrer zweiten Schaltstellung und betätigen die jeweiligen Ventile jeweils mit ihrem großen Ventilhub. Dazu schaltet die Steuer- und Regeleinheit 32 das dritte Nockenelement 13 bei einem Übergang von dem vierten Betriebsbereich 39 in den fünften Betriebsbereich 40 mittels der Aktuatorvorrichtung 31 von der ersten Schaltstellung in die zweite Schaltstellung und verändert so die Ventilhübe der von dem dritten Nockenelement 13 betätigten Ventile des dritten Zylinders von dem kleinen Ventilhub auf den großen Ventilhub. Ein Übergang von einem höheren Betriebsbereich 37, 38, 39, 40 zu dem nächst kleineren Betriebsbereich 36, 37, 38, 39 erfolgt analog zu dem entsprechenden Übergang von dem niedrigeren Betriebsbereich 36, 37, 38, 39 in den höheren Betriebsbereich 37, 38, 39, 40. Beispielsweise schaltet die Steuer- und Regeleinheit 32 bei einem Übergang von dem zweiten Betriebsbereich 37 in den ersten Betriebsbereich 36 das vierte Nockenelement 14 von der zweiten Schaltstelllung in die erste Schaltstellung. Grundsätzlich ist es ebenfalls denkbar, dass einzelne Betriebsbereiche 36, 37, 38, 39, 40 ausgesetzt werden, in dem beispielsweise eine Schaltung des entsprechenden Nockenelements 11 , 12, 13, 14 zeitweise ausgesetzt wird und beispielsweise erst bei einem Übergang in den entsprechenden nächsten oder übernächsten Betriebsbereich 36, 37, 38, 39, 40 durchgeführt wird. Dabei ist es denkbar, dass die Steuer- und Regeleinheit 32 einzelne Betriebsbereiche 36, 37, 38, 39, 40 oder die Schaltung der entsprechenden Nockenelemente 11 , 12, 13, 14 in den einzelnen Betriebsbereichen 36, 37, 38, 39, 40 auf Grund von Motorparametern, wie beispielsweise einem Lastmoment oder Ähnlichem, aussetzt. The Kraftfahrzeugventiltriebverstellvorrichtung has, as shown in Figure 2, five different operating areas 36, 37, 38, 39, 40. On the diagram shown in FIG. 2, a speed of the motor vehicle internal combustion engine 34 is plotted on the abscissa 41 and an output of the motor vehicle internal combustion engine 34 is plotted on the ordinate 42. In principle, it is also conceivable, of course, for the motor vehicle valve drive adjusting device to have another number of operating areas 36, 37, 38, 39, 40 that appears appropriate to the person skilled in the art. The various operating regions 36, 37, 38, 39, 40 are associated with a power-rpm range of the automotive internal combustion engine 34. Below a defined first power 43 and below a defined first speed 44, the motor vehicle internal combustion engine 34 is in the first operating range 36. Above the defined first power 43 and below a second defined power 45, or above the first defined speed 44 and below a second one The third operating range 38 is limited by the second defined power 45, the second defined speed 46, and a third defined power 47 and a third defined speed 48. The fourth operating range 39 is limited by the third defined power 47, the third defined speed 48 and a fourth defined power 49 and a fourth defined speed 50. The fifth operating range 40 is limited by the fourth defined power 49, the fourth defined speed 50 and a maximum power 51 and maximum speed 52. A definition of the various powers 43, 45, 47, 49, 51 and rotational speeds 44, 46, 48, 50, 52 takes place depending on the corresponding motor vehicle engine 34 and moves in areas that appear reasonable for the person skilled in the art. In each operating region 36, 37, 38, 39, 40, the motor vehicle valve drive adjusting device has a different combination of switching positions of the cam elements 11, 12, 13, 14. In the first operating region 36, all cam elements 11, 12, 13, 14 are switched to the same switching position. In the first operating region 36, the cam elements 11, 12, 13, 14 are each in their first switching position and actuate the respective valves each with a small valve lift. In the second operating region 37, the first three cam elements 11, 12, 13 are connected in the first switching position and the fourth cam element 14 in the second switching position. For this purpose, the control and regulating unit 32 switches the fourth cam member 14 in a transition from the first operating region 36 in the second operating region 37 by means of the actuator 31 from the first to the second switching position and thus changes the valve lifts the actuated by the fourth cam member 14 valves of fourth cylinder from the small valve lift to the large valve lift. In the third operating region 38, both the second cam element 12 and the third cam element 13 in the first switching position and the first cam element 11 and the fourth cam element 14 in the second switching position. For this purpose, the control and regulating unit 32 switches the first cam element 11 in a transition from the second operating region 37 in the third operating range 38 by means of the actuator 31 from the first switching position to the second switching position and thus changes the valve lifts the actuated by the first cam member 11 valves of the first cylinder from the small valve lift to the large valve lift. In the fourth operating region 39, only the third cam element 13 is in the first switching position. The first cam member 11, the second cam member 12 and the fourth cam member 14 are in the fourth operating range 39 in the second shift position. For this purpose, the control and regulating unit 32 switches the second cam member 12 at a transition from the third operating region 38 in the fourth operating region 39 by means of the actuator 31 from the first switching position to the second switching position and thus changes the valve strokes of the actuated by the first cam member 1 1 Valves of the second cylinder from the small valve lift to the large valve lift. In the fifth operating region 40, all cam elements 11, 12, 13, 14 are switched to the same switching position. In the fifth operating region 40, the cam elements 11, 12, 13, 14 are each in their second switching position and actuate the respective valves in each case with their large valve lift. For this purpose, the control and regulating unit 32 switches the third cam member 13 at a transition from the fourth operating region 39 in the fifth operating region 40 by means of the actuator 31 from the first switching position to the second switching position and thus changes the valve lifts the actuated by the third cam member 13 valves of the third cylinder from the small valve lift to the large valve lift. A transition from a higher operating range 37, 38, 39, 40 to the Next smaller operating range 36, 37, 38, 39 is analogous to the corresponding transition from the lower operating range 36, 37, 38, 39 in the higher operating range 37, 38, 39, 40. For example, the control unit 32 switches at a transition from the second operating region 37 into the first operating region 36, the fourth cam element 14 from the second switching position into the first switching position. In principle, it is also conceivable that individual operating areas 36, 37, 38, 39, 40 are exposed in which, for example, a circuit of the corresponding cam element 11, 12, 13, 14 is temporarily suspended and, for example, only at a transition to the corresponding next or after next operating range 36, 37, 38, 39, 40 is performed. It is conceivable that the control and regulation unit 32 individual operating areas 36, 37, 38, 39, 40 or the circuit of the corresponding cam elements 11, 12, 13, 14 in the individual operating areas 36, 37, 38, 39, 40 on Reason of engine parameters, such as a load torque or the like, exposes.
Grundsätzlich ist natürlich auch jegliche andere, dem Fachmann als sinnvoll erscheinende Schaltung der Nockenelemente 11 , 12, 13, 14 in den verschiedenen Betriebsbereichen 36, 37, 38, 39, 40 denkbar. So ist es beispielsweise denkbar, dass in dem zweiten Betriebsbereich 37 sowohl das erste Nockenelement 11 und das vierte Nockenelement 14 oder das dritte Nockenelement 13 und das vierte Nockenelement 14 in ihre zweite Schaltstellung geschaltet sind. Dazu würde die Steuer- und Regeleinheit 32 beispielsweise bei einem Übergang von dem ersten Betriebsbereich 36 in den zweiten Betriebsbereich 37 sowohl das erste Nockenelement 11 als auch das vierte Nockenelement 14 jeweils von der ersten Schaltstellung in die zweite Schaltstellung schalten und verändert so die Ventilhübe der von dem ersten Nockenelement 11 und von dem vierten Nockenelement 14 betätigten Ventile des ersten und des vierten Zylinders jeweils von dem kleinen Ventilhub auf den großen Ventilhub. In principle, of course, any other circuit of the cam elements 11, 12, 13, 14 which appears to the person skilled in the art to be useful in the various operating regions 36, 37, 38, 39, 40 is also conceivable. Thus, it is conceivable, for example, for both the first cam element 11 and the fourth cam element 14 or the third cam element 13 and the fourth cam element 14 to be switched to their second switching position in the second operating region 37. For this purpose, the control and regulating unit 32 would, for example, switch both the first cam element 11 and the fourth cam element 14 in each case from the first switching position to the second switching position in a transition from the first operating region 36 into the second operating region 37, thus changing the valve strokes of Valves of the first and fourth cylinders operated by the first cam member 11 and the fourth cam member 14, respectively, from the small valve lift to the large valve lift.
Die Aktuatorvorrichtung 31 weist eine mechanische Codierung auf, die eine definierte Schaltabfolge der Nockenelemente 11 , 12, 13, 14 vorgibt. Durch die mechanische Codierung der Aktuatorvorrichtung 31 wird eine Schaltabfolge der Nockenelemente 1 1 , 12, 13, 14 fest vorgegeben und eine Schaltung der einzelnen Nockenelemente 11 , 12, 13, 14 folgt immer einem festgelegten Muster. Die einzelnen Schaltstellungen der einzelnen Nockenelemente 11 , 12, 13, 14 in den verschiedenen Betriebsbereichen 36, 37, 38, 39, 40 sind durch die mechanische Codierung vorgegeben. Auf die Schaltstellung eines Nockenelements 11 , 12, 13, 14 folgt in einem nächsten Betriebsbereich 36, 37, 38, 39, 40 immer die gleiche Schaltstellung. So kann eine Schaltabfolge des ersten Nockenelements 11 , das dem ersten Zylinder zugeordnet ist, beispielsweise erste Schaltstellung, erste Schaltstellung, zweite Schaltstellung, zweite Schaltstellung, zweite Schaltstellung betragen. Bei einer Schaltung von dem einen Betriebsbereich 36, 37, 38, 39, 40 in einen benachbarten Betriebsbereich 36, 37, 38, 39, 40 gibt die Steuer- und Regeleinheit 32 lediglich ein Signal zur Schaltung an die Aktuatorvorrichtung 31 aus und eine korrekte Schaltung der Nockenelemente 11 , 12, 13, 14 ist durch die mechanische Codierung vorbestimmt. Eine Fehlschaltung oder ein Ausbleiben einer Schaltung eines der Nockenelemente 1 1 , 12, 13, 14 ist ausgeschlossen. Es liegen immer definierte Schaltstellungen der Nockenelemente 11 , 12, 13, 14 vor. The actuator device 31 has a mechanical coding, which defines a defined switching sequence of the cam elements 11, 12, 13, 14. Due to the mechanical coding of the actuator device 31, a switching sequence of the cam elements 11, 12, 13, 14 is fixed and a circuit of the individual cam elements 11, 12, 13, 14 always follows a fixed pattern. The individual switching positions of the individual cam elements 11, 12, 13, 14 in the various operating regions 36, 37, 38, 39, 40 are predetermined by the mechanical coding. On the switching position of a cam member 11, 12, 13, 14 follows in a next operating range 36, 37, 38, 39, 40 always the same switching position. Thus, a switching sequence of the first cam element 11, which is assigned to the first cylinder, for example, first switching position, first Shift position, second shift position, second shift position, second shift position amount. In a circuit from the one operating region 36, 37, 38, 39, 40 into an adjacent operating region 36, 37, 38, 39, 40, the control and regulating unit 32 outputs only a signal for switching to the actuator device 31 and a correct circuit the cam elements 11, 12, 13, 14 is predetermined by the mechanical coding. A malfunction or failure of a circuit of the cam elements 1 1, 12, 13, 14 is excluded. There are always defined switching positions of the cam elements 11, 12, 13, 14 before.
Die Aktuatorvorrichtung 31 ist dazu vorgesehen, die Nockenelemente 11 , 12, 13, 14 in Abhängigkeit von zumindest einem Betriebsparameter der Kraftfahrzeugbrennkraftmaschine 34 zu schalten. Die Steuer- und Regeleinheit 32 gibt bei überschreiten einer definierten Drehzahl oder einer definierten Leistung der Kraftfahrzeugbrennkraftmaschine 34, die jeweils zwei Betriebsbereiche 36, 37, 38, 39, 40 voneinander trennen, ein Signal zum schalten der entsprechenden Nockenelemente 11 , 12, 13, 14 mittels der Aktuatorvorrichtung 31. The actuator device 31 is provided to switch the cam elements 11, 12, 13, 14 as a function of at least one operating parameter of the motor vehicle internal combustion engine 34. The control unit 32 outputs a signal for switching the corresponding cam elements 11, 12, 13, 14 when exceeding a defined speed or a defined power of the motor vehicle engine 34, which separate two operating areas 36, 37, 38, 39, 40 from each other by means of the actuator device 31.
Die oben angeführte Beschreibung bezieht sich nur auf die Ausgestaltung der Kraftfahr- zeugnockenwellenverstellvorrichtung für eine Kraftfahrzeugbrennkraftmaschine 34 mit vier Zylindern. Eine Ausgestaltung der Kraftfahrzeugnockenwellenverstellvorrichtung für eine Kraftfahrzeugbrennkraftmaschine 34 mit einer anderen, dem Fachmann als sinnvoll erscheinenden Anzahl an Zylindern, wie beispielsweise zwei Zylinder, drei Zylinder, sechs Zylinder oder acht Zylinder ist im Wesentlichen gleich. Eine andere Anzahl an Zylindern bewirkt eine angepasste Anzahl an axial verschiebbaren Nockenelementen 1 1 , 12, 13, 14 und dadurch eine Anzahl an Kombinationsmöglichkeiten der Schaltstellung der verschiedenen Nockenelemente 11 , 12, 13, 14. Auch bei Kraftfahrzeugnockenwellenverstellvor- richtungen für eine Kraftfahrzeugbrennkraftmaschine 34 mit mehr oder weniger Zylindern erfolgt eine, wie im obigen Ausführungsbeispiel beschrieben, einzelne oder gruppenweise Schaltung der Nockenelemente 11 , 12, 13, 14, die wie oben beschrieben, auf die Anzahl an Nockenelementen 11 , 12, 13, 14 angepasst werden kann. Eine Ausgestaltung der Aktuatorvorrichtung 31 und eine Anzahl und/oder Anordnung der Aktuatoren 33 kann auf eine, dem Fachmann als sinnvoll erscheinende Weise geschehen. Bezugszeichenliste Nockenwelle The description above refers only to the design of the motor vehicle camshaft adjuster for a four-cylinder automotive internal combustion engine. An embodiment of the Kraftfahrzeugnockenwellenverstellvorrichtung for a motor vehicle internal combustion engine 34 with another, to those skilled appears reasonable number of cylinders, such as two cylinders, three cylinders, six cylinders or eight cylinders is substantially equal. Another number of cylinders causes an adapted number of axially displaceable cam elements 1 1, 12, 13, 14 and thereby a number of possible combinations of the switching position of the various cam elements 11, 12, 13, 14. Also in Kraftfahrzeugnockenwellenverstellvor- directions for an automotive internal combustion engine 34 with more or less cylinders takes place, as described in the above embodiment, single or group-wise circuit of the cam elements 11, 12, 13, 14, which, as described above, can be adapted to the number of cam elements 11, 12, 13, 14. An embodiment of the actuator device 31 and a number and / or arrangement of the actuators 33 can be done in a manner that appears appropriate to the person skilled in the art. Reference numeral camshaft
Nockenelement cam member
Nockenelement cam member
Nockenelement cam member
Nockenelement cam member
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Nockenspur cam track
Aktuatorvorrichtung actuator
Steuer- und/oder Regeleinheit Control and / or regulating unit
Aktuator actuator
Kraftfahrzeugbrennkraftmaschine Automotive engine
Rotationsachse axis of rotation
Betriebsbereich operating range
Betriebsbereich operating range
Betriebsbereich Betriebsbereich Betriebsbereich Abszisse operating range Operating range Operating range abscissa
Ordinate erste Leistung erste Drehzahl zweite Leistung zweite Drehzahl dritte Leistung dritte Drehzahl vierte Leistung vierte Drehzahl maximale Leistung maximale Drehzahl Ordinate first power first speed second power second speed third power third speed fourth power fourth speed maximum power maximum speed

Claims

Patentansprüche claims
1. Kraftfahrzeugventiltriebverstellvorrichtung mit zumindest einer Nockenwelle (10), die zumindest zwei axial verschiebbar angeordnete Nockenelemente (11 , 12, 13, 14) umfasst, die zur Verstellung eines Ventilhubs zumindest eines Ventils eines Zylinders jeweils zumindest zwei Nockenspuren (15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30) aufweisen, und mit zumindest einer Aktuatorvorrichtung (31 ), die zur Verstellung des Ventilhubs dazu vorgesehen ist, zumindest eines der Nockenelemente (11 , 12, 13, 14) der Nockenwelle (10) axial zu verschieben, gekennzeichnet durch 1. Kraftfahrzeugventiltriebverstellvorrichtung with at least one camshaft (10) which comprises at least two axially displaceably arranged cam elements (11, 12, 13, 14) for adjusting a valve lift at least one valve of a cylinder in each case at least two cam tracks (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30), and with at least one actuator device (31) provided for adjusting the valve lift thereto, at least one of the cam elements (11, 12, 13, 14) of the camshaft (10) to move axially, characterized by
eine Steuer- und/oder Regeleinheit (32), die dazu vorgesehen ist, die zumindest zwei Nockenelemente (11 , 12, 13, 14) zumindest teilweise unabhängig voneinander zu schalten.  a control and / or regulating unit (32) which is provided to switch the at least two cam elements (11, 12, 13, 14) at least partially independently of one another.
2. Kraftfahrzeugventiltriebverstellvorrichtung nach Anspruch 1 , 2. Kraftfahrzeugventiltriebverstellvorrichtung according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
die Steuer- und/oder Regeleinheit (32) in zumindest einem Betriebszustand dazu vorgesehen ist, eine Schaltstellung zumindest eines der Nockenelemente (11 , 12, 13, 14) zu verändern und eine Schaltstellung zumindest eines anderen Nockenelements (11 , 12, 13, 14) aufrechtzuerhalten.  the control and / or regulating unit (32) is provided in at least one operating state to change a switching position of at least one of the cam elements (11, 12, 13, 14) and a switching position of at least one other cam element (11, 12, 13, 14 ) maintain.
Kraftfahrzeugventiltriebverstellvorrichtung nach Anspruch 1 oder 2, Kraftfahrzeugventiltriebverstellvorrichtung according to claim 1 or 2,
dadurch gekennzeichnet, dass characterized in that
zumindest eines der Nockenelemente (11 , 12, 13, 14) in zumindest einem Betriebszustand eine Nockenspur (15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30) in Eingriff hat, die einen anderen Ventilhub auslöst als ein anderes der Nockenelemente (11 , 12, 13, 14) der Nockenwelle (10). at least one of the cam elements (11, 12, 13, 14) in at least one operating state, a cam track (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30), which triggers a different valve lift than another of the cam elements (11, 12, 13, 14) of the camshaft (10).
Kraftfahrzeugventiltriebverstellvorrichtung nach einem der vorhergehenden Ansprüche, Kraftfahrzeugventiltriebverstellvorrichtung according to any one of the preceding claims,
gekennzeichnet durch marked by
zumindest einen weiteren Betriebszustand, in dem zumindest ein Nockenelement (11 , 12, 13, 14) eine Nockenspur (15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30) in Eingriff hat, die einen anderen Ventilhub auslöst als eine Nockenspur (15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30), die in dem anderen Betriebszustand in Eingriff ist. at least one further operating state in which at least one cam element (11, 12, 13, 14) has a cam track (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30) engaging a valve lift other than a cam track (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30), which is engaged in the other operating state.
Kraftfahrzeugventiltriebverstellvorrichtung nach einem der vorhergehenden Ansprüche, Kraftfahrzeugventiltriebverstellvorrichtung according to any one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
die Nockenwelle (10) zumindest vier axial verschiebbare Nockenelemente (11 , 12, 13, 14) umfasst, wobei zumindest zwei Nockenelemente (11 , 12, 13, 14) in zumindest einem Betriebszustand jeweils eine Nockenspur (15, 16, 17, 18, 19, 20, 21 , 22,the camshaft (10) comprises at least four axially displaceable cam elements (11, 12, 13, 14), wherein at least two cam elements (11, 12, 13, 14) in at least one operating state each have a cam track (15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 29, 30) in Eingriff haben, die einen anderen Ventilhub auslösen als die in Eingriff befindlichen Nockenspuren (15, 16, 17, 18, 19, 20, 21 , 22, 23,23, 24, 25, 26, 27, 28, 29, 30) which trigger a different valve lift than the engaged cam tracks (15, 16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30) der anderen zwei Nockenelemente (11 , 12, 13, 14). 24, 25, 26, 27, 28, 29, 30) of the other two cam members (11, 12, 13, 14).
Kraftfahrzeugventiltriebverstellvorrichtung nach einem der vorhergehenden Ansprüche, Kraftfahrzeugventiltriebverstellvorrichtung according to any one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
die Aktuatorvorrichtung (31 ) zumindest einen zentralen Aktuator (33) umfasst, der dazu vorgesehen ist, zumindest zwei der Nockenelemente (11 , 12, 13, 14) zu schalten. the actuator device (31) comprises at least one central actuator (33) which is provided to switch at least two of the cam elements (11, 12, 13, 14).
7. Kraftfahrzeugventiltriebverstellvorrichtung nach einem der vorhergehenden Ansprüche, 7. Kraftfahrzeugventiltriebverstellvorrichtung according to any one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
die Aktuatorvorrichtung (31 ) eine mechanische Codierung aufweist, die zumindest eine definierte Schaltabfolge der Nockenelemente (11 , 12, 13, 14) vorgibt.  the actuator device (31) has a mechanical coding which specifies at least one defined switching sequence of the cam elements (11, 12, 13, 14).
8. Kraftfahrzeugventiltriebverstellvorrichtung nach einem der vorhergehenden Ansprüche, 8. Kraftfahrzeugventiltriebverstellvorrichtung according to any one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
die Aktuatorvorrichtung (31 ) dazu vorgesehen ist, die Nockenelemente (11 , 12, 13, 14) in Abhängigkeit von zumindest einem Betriebsparameter der Kraftfahrzeugbrennkraftmaschine (34) zu schalten.  the actuator device (31) is provided to switch the cam elements (11, 12, 13, 14) as a function of at least one operating parameter of the motor vehicle internal combustion engine (34).
9. Verfahren zum Betrieb einer Kraftfahrzeugventiltriebverstellvorrichtung nach einem der vorhergehenden Ansprüche. 9. A method for operating a Kraftfahrzeugventiltriebverstellvorrichtung according to any one of the preceding claims.
10. Brennkraftmaschine mit einer erfindungsgemäßen Kraftfahrzeugventiltriebverstell- vorrichtung nach einem der vorhergehenden Ansprüche. 10. Internal combustion engine with a Kraftfahrzeugventiltriebverstell- device according to any one of the preceding claims.
PCT/EP2013/000022 2012-02-14 2013-01-08 Device for adjusting the valve train of a motor vehicle WO2013120567A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021375A1 (en) 2004-04-30 2006-01-26 Audi Ag Valve operating mechanism of internal combustion engine has one cam shaft, on which axially adjustable cam carrier is arranged, whereby cam shaft is supported by bearing block, which has thrust bearing impact surfaces on both of its sides
DE102007010148A1 (en) * 2007-03-02 2008-09-04 Audi Ag Valve gear for internal combustion engine, includes bearing which can be slid along cam shaft with cam carriers, relative to engine casing
DE102007037747A1 (en) * 2007-08-10 2009-02-12 Daimler Ag combustion engine valve
DE102008029325A1 (en) * 2008-06-20 2009-12-24 Daimler Ag Valve drive device
DE102008036030A1 (en) * 2008-08-01 2010-02-04 Daimler Ag Valve train device for use in internal-combustion engine, has set of cams arranged on set of cam elements, and bearing device rotatably mounting set of partial cams on cam elements in axial and firm manner
DE102008064340A1 (en) * 2008-12-20 2010-06-24 Audi Ag Valve train for gas exchange valves of internal-combustion engine, has base camshaft comprising cylindrical shaft sections between adjacent external gearing sections, and cam carriers radially guided on one of cylindrical shaft sections
WO2010142408A1 (en) * 2009-06-10 2010-12-16 Audi Ag Constructed shaft element, particularly a constructed camshaft for valve controlled internal combustion engines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004021375A1 (en) 2004-04-30 2006-01-26 Audi Ag Valve operating mechanism of internal combustion engine has one cam shaft, on which axially adjustable cam carrier is arranged, whereby cam shaft is supported by bearing block, which has thrust bearing impact surfaces on both of its sides
DE102007010148A1 (en) * 2007-03-02 2008-09-04 Audi Ag Valve gear for internal combustion engine, includes bearing which can be slid along cam shaft with cam carriers, relative to engine casing
DE102007037747A1 (en) * 2007-08-10 2009-02-12 Daimler Ag combustion engine valve
DE102008029325A1 (en) * 2008-06-20 2009-12-24 Daimler Ag Valve drive device
DE102008036030A1 (en) * 2008-08-01 2010-02-04 Daimler Ag Valve train device for use in internal-combustion engine, has set of cams arranged on set of cam elements, and bearing device rotatably mounting set of partial cams on cam elements in axial and firm manner
DE102008064340A1 (en) * 2008-12-20 2010-06-24 Audi Ag Valve train for gas exchange valves of internal-combustion engine, has base camshaft comprising cylindrical shaft sections between adjacent external gearing sections, and cam carriers radially guided on one of cylindrical shaft sections
WO2010142408A1 (en) * 2009-06-10 2010-12-16 Audi Ag Constructed shaft element, particularly a constructed camshaft for valve controlled internal combustion engines

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