EP3237730A1 - Valve drive device for an internal combustion engine - Google Patents

Valve drive device for an internal combustion engine

Info

Publication number
EP3237730A1
EP3237730A1 EP15804071.7A EP15804071A EP3237730A1 EP 3237730 A1 EP3237730 A1 EP 3237730A1 EP 15804071 A EP15804071 A EP 15804071A EP 3237730 A1 EP3237730 A1 EP 3237730A1
Authority
EP
European Patent Office
Prior art keywords
engagement element
switching position
engagement
adjusting device
restoring force
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15804071.7A
Other languages
German (de)
French (fr)
Other versions
EP3237730B1 (en
Inventor
Juergen Bauer
Matthias Lahr
Marc Oliver Wagner
Benjamin Zeller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
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 EP3237730A1 publication Critical patent/EP3237730A1/en
Application granted granted Critical
Publication of EP3237730B1 publication Critical patent/EP3237730B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • 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 valve drive device for an internal combustion engine, an internal combustion engine with an engine brake and a method for operating the valve drive device.
  • the valve drive device comprises an axial
  • the adjusting device comprises a first engagement element which is provided to axially displace the cam element into a first switching position. Furthermore, the adjusting device comprises a second engagement element which is provided to axially displace the cam element into a second switching position.
  • the adjusting device has a first slide track, in which the first engagement element is guided in the first switching position. Furthermore, the adjusting device has a second slide track, in which the second engagement element is guided in the second switching position.
  • the first engagement element is forcibly coupled to the second engagement element.
  • the invention is in particular the object of a particularly
  • the invention is based on a valve drive device for an internal combustion engine, with an axially displaceable cam element and with an adjusting device comprising a first engagement element which is intended to axially displace the cam element into a first switching position and which comprises a second engagement element is provided to the cam member in a second switching position to move axially, wherein the adjusting device has a first slide track, in which the first engagement element is guided in the first switching position, and a second slide track, in which the second engagement element is guided in the second switching position, wherein the first engagement element with the second
  • Engagement element is formed positively coupled.
  • the adjusting device comprises a triggering device, which is provided to hold the first engaging element in the second switching position against a restoring force.
  • Brake motor in particular a truck, is.
  • Valve train device is preferably for an internal combustion engine one
  • the cam element is preferably rotatably and axially displaceably mounted.
  • a "cam element rotatably and axially displaceably mounted” is to be understood in particular as a cam element which is rotatably and axially displaceably mounted relative to a cylinder head or another stationarily arranged component of the internal combustion engine
  • Cam member rotatably and is, in particular together with the
  • Cam element mounted axially displaceable in the cylinder head.
  • the term “axial” is particularly related to a main axis of rotation of the cam member, so that the term “axial” refers in particular to a direction which is parallel or coaxial with the main axis of rotation.
  • the term “radial” is particularly related to the main axis of rotation of the cam member, so that the term “radial” refers in particular to a direction which is perpendicular to the main axis of rotation.
  • valve lift changeover is to be understood to mean, in particular, a discrete switchover between at least two valve actuation curves which define an actuation of at least one gas exchange valve
  • Crom element is to be understood in particular an element which has at least one cam for actuating a gas exchange valve merely providing the first engagement member for axial displacement of the cam member in two opposite directions.
  • a "first switching position" is intended in particular to mean a
  • a "second switching position" is intended in particular to mean a triggering position and / or a triggering position
  • Motor brake position are understood.
  • the restoring force is at least substantially constant.
  • provided is to be understood in particular to be specially designed, designed, equipped and / or arranged.
  • the triggering device comprises an electromagnet, which is provided to hold the first engagement element in the second switching position against the restoring force.
  • the triggering device is provided to provide a triggering force, which extends radially starting from the cam element.
  • the triggering device comprises a return spring, which is provided for exerting the restoring force on the first engagement element in the direction of the first slide track.
  • the return spring forms a helical compression spring.
  • the restoring force is aligned radially in the direction of the cam member.
  • the return spring is provided to return the first engagement element after a shutdown of the electromagnet in the first slide track for performing a switching operation in the first switching position.
  • an operation in case of electrical failure of the electromagnet can advantageously be continued in the first switching position.
  • no external energy, such as, in particular, electrical energy is required to carry out the switching operation into the first switching position.
  • the first slide track is provided for, upon rotation of the cam member in the first switching position, the first engagement member to oscillate in a radial direction of the cam member to move.
  • the first slide track viewed over a circumferential course, different distances to the main axis of rotation of the cam member.
  • the first engagement element can advantageously be introduced as a function of a rotation angle of the cam element. This can advantageously be achieved increased reliability.
  • the first engagement element is arranged in such a way to the triggering device that the restoring force in a movement portion of the first engagement element is greater than a release force of the triggering device acting on the first engagement element.
  • a "release force” is to be understood as meaning, in particular, a holding force and / or a magnetic force, in particular an attractive magnetic force
  • a "movement portion” is to be understood as meaning in particular a portion of a maximum possible range of motion.
  • the triggering device preferably acts on the first engagement element only in a near zone with a greater release force than the restoring force. Thereby, a switching operation in an unwanted rotational angle position of the cam member can be advantageously avoided.
  • a temporal control of the triggering device can advantageously also be carried out imprecisely and / or independently of a rotational angle position of the cam element.
  • the adjustment device comprises a lever element which supports the first engagement element and the second engagement element about a common pivot axis.
  • the pivot axis is parallel to the main axis of rotation of the cam member.
  • Other triggering devices can be advantageously avoided.
  • a synchronization between a movement of the first engagement element and a movement of the second engagement element can be achieved particularly reliable and durable.
  • valve drive device comprises a camshaft for the rotationally fixed mounting of the cam element, wherein the adjusting device is arranged at a free longitudinal end of the camshaft.
  • the valve drive device can be integrated particularly easily into an internal combustion engine.
  • a "free longitudinal end” should in particular refer to a free end. be understood in a main extension direction of an element.
  • Cam element in two opposite directions from a first switching position proposed in a second switching position, with an adjusting device, wherein a first engaging element is positively coupled to a second engaging element and wherein the first engaging member of a triggering device in the second
  • Shift position is held against a restoring force. As a result, a particularly high level of operational reliability can be achieved.
  • valvetrain device 1 is an isometric view of a valvetrain device
  • Fig. 3 is a side view of the valve drive device in a maximum
  • valve drive device 4 shows the valve drive device in a sectional view through IV - IV
  • Fig. 5 is another side view of the valve drive device in a minimum
  • valve drive device 6 is a sectional view of the valve drive device in one
  • Fig. 7 is a further sectional view of the valve drive device in one
  • FIG. 8 is another side view of the valve drive device in one
  • Fig. 9 is another side view of the valve drive device in a
  • Figures 1 and 2 show a valve drive device for an internal combustion engine not shown in detail.
  • the internal combustion engine has an engine brake.
  • the valve drive device comprises an axially displaceable cam element 10.
  • the valve drive device has a camshaft 22.
  • the camshaft 22 is provided for the rotationally fixed mounting of the cam member 10. That's it
  • Cam member 10 rotatably connected to the camshaft 22.
  • the cam 10 is rotatably mounted about a main axis of rotation 23.
  • the camshaft 22 is rotatably supported about the main rotation axis 23.
  • the camshaft 22 has two differently configured, not shown in detail cam.
  • the different cams have a same base circle radius.
  • the different cams are each provided for different operating modes, such as in particular for a firing mode and for an engine braking mode.
  • the valve drive device has an adjusting device 11.
  • the adjusting device 11 is a adjusting device 11.
  • the first engagement element 12 is provided for axially displacing the cam element 10 into a first shift position.
  • the first engagement element 12 is cylindrical.
  • the adjusting device 11 has a first slide track 14.
  • Sliding track 14 has different segments.
  • a segment forms a first engagement segment 27.
  • Another segment forms a first adjustment segment 28.
  • the first Einspursegment 27 extends in the circumferential direction and has three circumferentially offset by 120 ° elevations.
  • the first slide track 14 thus has, viewed over a circumferential course, different distances to
  • Cam member 10 is an oscillating movement. A maximum
  • Oscillation angle reaches the first engagement element 12 on one of the elevations.
  • a minimum oscillation angle reaches the first engagement element 12 at a middle between two elevations.
  • the first slide track 14 is provided, upon rotation of the cam member 10 in the first switching position, the first Engagement member 12 oscillating in a radial direction 19 of the cam member 10 to move.
  • the first adjustment segment 28 has a direction with a radial and an axial component. Due to the axial component, the cam member 10 can be moved axially. A radial depth of the first adjustment segment 28 corresponds to a radial depth of the first engagement segment 27. A radial height of a first
  • the adjusting device 11 comprises a second engagement element 13.
  • the second engagement element 13 is provided for axially displacing the cam element 10 into a second switching position.
  • the adjusting device 11 is arranged at a free longitudinal end 26 of the camshaft 22.
  • the second engagement element 13 is cylindrical.
  • the adjusting device 11 has a second slide track 15.
  • the second slide track 15 is axially spaced from the first slide track 14.
  • the second slide track 15 has different segments.
  • One segment forms a second single track segment 30.
  • the second Einspursegment 30 extends in the circumferential direction and has a circumferentially constant distance to the main axis of rotation 23.
  • the second Einspursegment 30 includes a second adjustment segment 31.
  • the second adjustment segment 31 has a direction with a radial and an axial component. Due to the axial component, the cam member 10 can be moved axially.
  • the second adjustment segment 31 is further spaced from the main rotation axis 23 than the second engagement segment 30.
  • a step is formed over an entire circumference.
  • a height of a second guide wall 32 of the second adjustment segment 31 decreases in the circumferential direction.
  • the second adjustment segment 31 is provided to guide the second engagement element 13 along the second guide wall 32 into the engagement segment 30 when the second shift position is activated.
  • the cam member 10 is thereby displaced axially.
  • the second guide wall 32 includes an acute angle to a main rotation plane of the cam member 10.
  • the main rotation plane is perpendicular to the main axis of rotation 23.
  • the first engagement element 12 is guided in the first shift position in the first slide track 14.
  • the valve drive device is in a firing mode.
  • the first engagement element 12 is moved up and down on the first slide track 14 in a radial direction.
  • FIG. 3 shows the first one
  • Engagement element 12 with a maximum oscillation angle.
  • the first engagement element 12 of the main axis of rotation 23 is closest.
  • the first engagement element 12 is located between two elevations of the first engagement segment 27.
  • One of the elevations pushes the first engagement element 12 away from the main rotation axis 23 during further rotation of the cam element 10.
  • FIG. 5 shows the first engagement element 12 a minimum oscillation angle.
  • the first engagement element 12 is furthest from the main axis of rotation 23.
  • the first engagement element 12 lies on one of the elevations of the first Einspursegments 27th
  • the second engagement element 13 is spaced apart from the second slide track 15 during the firing mode.
  • the first engagement element 12 is positively coupled to the second engagement element 13.
  • the adjusting device 11 comprises a lever element 33.
  • the lever element 33 supports the first engagement element 12 and the second engagement element 13 about a common pivot axis 21.
  • the common pivot axis 21 extends parallel to the main axis of rotation 23 of the cam element 10.
  • the triggering device 16 comprises a return spring 18.
  • the return spring 18 loads the first engagement element 12 with a restoring force.
  • the return spring 18 is provided for exerting the restoring force on the first engagement element 12 in the direction of the first slide track 14.
  • the return spring 18 forms a helical compression spring.
  • the restoring force is aligned radially in the direction of the cam element 10.
  • the adjusting device 11 comprises a triggering device 16.
  • the triggering device 16 is provided for changing the operating mode. More specifically, the tripping device 16 is provided for activating an engine braking mode. For this purpose, the triggering device 16 holds the first engagement element 12 against the restoring force (FIG. 6).
  • the triggering device 16 comprises an electromagnet 17.
  • the electromagnet 17 is provided to hold the first engagement element 12 in the second switching position against the restoring force.
  • the electromagnet 17 is electrically actuated via a cable 34.
  • the triggering device 16 is provided to provide a triggering force that extends radially from the cam element 10. The release force corresponds to a magnetic holding force in this embodiment.
  • the electromagnet 17 is arranged radially behind the first engagement element 12 starting from the main rotational axis 23.
  • the electromagnet 17 attracts the first engagement element 12 in an activated state.
  • the electromagnet 17 comprises a magnet coil 24.
  • the electromagnet 17 further comprises a magnet housing 25 in which the magnet coil 24 is arranged.
  • the return spring 18 is disposed within the magnet housing 25.
  • the return spring 18 is surrounded by the magnetic coil 24.
  • the return spring 18 is arranged coaxially with the magnet coil 24.
  • the first engagement element 12 is arranged in such a way to the triggering device 16, that the restoring force in a moving portion 20 of the first engaging member 12 is greater than acting on the first engaging member 12 release force of the triggering device 16.
  • a distance between the electromagnet 17 and a magnetic force of the electromagnet 17th are designed by a specialist so that the release force exceeds the restoring force only in the range of the minimum oscillation angle.
  • the triggering device 16 does not trigger, since the magnetic force acting on the engagement element 12 is less than the restoring force of the return spring 18. With a decreasing oscillation angle and the associated approach of the first engagement element 12 the electromagnet 17 increases the effect of the magnetic force on the first engaging element 12 and finally exceeds the restoring force in a near area. Then, the first engagement element 12 is used to the electromagnet 17.
  • the second engagement member 13 is applied to the second slide track 15.
  • the cam member 10 is displaced axially by abutment of the second engagement member 13 on the second guide wall 32 and then moves into the second Einspursegment 30. Thereby, the cam member 10 is axially locked ( Figure 7).
  • the second switching position is now taken.
  • the first engagement element 13 is in the second switching position on the electromagnet 17.
  • the electromagnet 17 is turned off.
  • the return spring 18 is provided to return the first engagement element 12 after the switching off of the electromagnet 17 in the first slide track 14 for performing the switching operation in the first switching position. In case of failure of the electromagnet 17 also carried out the implementation of the switching operation in the first switching position.
  • the return spring 18 presses the first engagement element 12 after the switching off of the electromagnet 17 on the first slide track 14.
  • the first engagement element 12 is located at the axial height of the first

Landscapes

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

Abstract

The invention relates to a valve drive device for an internal combustion engine, having an axially displaceable cam element (10) and having an adjusting device (11) which comprises a first engagement element (12) which is provided to displace the cam element (10) axially into a first switching position, and which comprises a second engagement element (13) which is provided to displace the cam element (10) axially into a second switching position, wherein the adjusting device (11) has a first slotted guide track (14), in which the first engagement element (12) is guided in the first switching position, and has a second slotted guide track (15), in which the second engagement element (13) is guided in the second switching position, wherein the first engagement element (12) is configured so as to be positively coupled to the second engagement element (13), and wherein the adjusting device (11) comprises a triggering device (16) which is provided to hold the first engagement element (12) fixedly in the second switching position counter to a restoring force, and to a method for axial displacement of a rotating cam element (10) from a first switching position into a second switching position, having an adjusting device (11), wherein a first engagement element (12) is positively coupled to a second engagement element (13), and wherein the first engagement element (12) is held fixedly in the second switching position by a triggering device (16) counter to a restoring force.

Description

Ventiltriebvorrichtung für eine Brennkraftmaschine  Valve train device for an internal combustion engine
Die Erfindung betrifft eine Ventiltriebvorrichtung für eine Brennkraftmaschine, eine Brennkraftmaschine mit einer Motorbremse und ein Verfahren zum Betrieb der Ventiltriebvorrichtung. The invention relates to a valve drive device for an internal combustion engine, an internal combustion engine with an engine brake and a method for operating the valve drive device.
Aus der DE 10 2007 048 915 A1 ist bereits eine Ventiltriebvorrichtung für eine From DE 10 2007 048 915 A1 is already a valve drive device for a
Brennkraftmaschine bekannt. Die Ventiltriebvorrichtung umfasst ein axial Internal combustion engine known. The valve drive device comprises an axial
verschiebbares Nockenelement und eine Versteilvorrichtung. Die Verstellvorrichtung umfasst ein erstes Eingriffselement, das dazu vorgesehen ist, das Nockenelement in eine erste Schaltstellung axial zu verschieben. Ferner umfasst die Versteilvorrichtung ein zweites Eingriffselement, das dazu vorgesehen ist, das Nockenelement in eine zweite Schaltstellung axial zu verschieben. Die Verstellvorrichtung weist eine erste Kulissenbahn auf, in welcher das erste Eingriffselement in der ersten Schaltstellung geführt ist. Des Weiteren weist die Verstellvorrichtung eine zweite Kulissenbahn auf, in welcher das zweite Eingriffselement in der zweiten Schaltstellung geführt ist. Das erste Eingriffselement ist mit dem zweiten Eingriffselement zwangsgekoppelt ausgebildet. slidable cam element and an adjusting device. The adjusting device comprises a first engagement element which is provided to axially displace the cam element into a first switching position. Furthermore, the adjusting device comprises a second engagement element which is provided to axially displace the cam element into a second switching position. The adjusting device has a first slide track, in which the first engagement element is guided in the first switching position. Furthermore, the adjusting device has a second slide track, in which the second engagement element is guided in the second switching position. The first engagement element is forcibly coupled to the second engagement element.
Der Erfindung liegt insbesondere die Aufgabe zugrunde, einen besonders The invention is in particular the object of a particularly
zuverlässigen Betrieb einer Brennkraftmaschine zu erzielen. Sie wird durch eine erfindungsgemäße Ausgestaltung entsprechend den Ansprüchen 1 und 9, sowie durch ein erfindungsgemäßes Verfahren entsprechend dem Anspruch 10 gelöst. to achieve reliable operation of an internal combustion engine. It is achieved by an inventive embodiment according to claims 1 and 9, and by a method according to the invention according to claim 10.
Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen. Further developments of the invention will become apparent from the dependent claims.
Die Erfindung geht aus von einer Ventiltriebvorrichtung für eine Brennkraftmaschine, mit einem axial verschiebbaren Nockenelement und mit einer Verstellvorrichtung, die ein erstes Eingriffselement umfasst, das dazu vorgesehen ist, das Nockenelement in eine erste Schaltstellung axial zu verschieben, und die ein zweites Eingriffselement umfasst, das dazu vorgesehen ist, das Nockenelement in eine zweite Schaltstellung axial zu verschieben, wobei die Verstellvorrichtung eine erste Kulissenbahn aufweist, in welcher das erste Eingriffselement in der ersten Schaltstellung geführt ist, und eine zweite Kulissenbahn aufweist, in welcher das zweite Eingriffselement in der zweiten Schaltstellung geführt ist, wobei das erste Eingriffselement mit dem zweiten The invention is based on a valve drive device for an internal combustion engine, with an axially displaceable cam element and with an adjusting device comprising a first engagement element which is intended to axially displace the cam element into a first switching position and which comprises a second engagement element is provided to the cam member in a second switching position to move axially, wherein the adjusting device has a first slide track, in which the first engagement element is guided in the first switching position, and a second slide track, in which the second engagement element is guided in the second switching position, wherein the first engagement element with the second
Eingriffselement zwangsgekoppelt ausgebildet ist. Engagement element is formed positively coupled.
Es wird vorgeschlagen, dass die Verstellvorrichtung eine Auslösevorrichtung umfasst, die dazu vorgesehen ist, das erste Eingriffselement in der zweiten Schaltstellung entgegen einer Rückstellkraft festzuhalten. Dadurch kann ein besonders sicherer Motorbetrieb, insbesondere auch bei einem Ausfall der Auslösevorrichtung, erreicht werden. Zusätzliche Auslösevorrichtungen können vorteilhaft vermieden werden. It is proposed that the adjusting device comprises a triggering device, which is provided to hold the first engaging element in the second switching position against a restoring force. As a result, particularly reliable engine operation, in particular even in the event of a failure of the triggering device, can be achieved. Additional triggering devices can be advantageously avoided.
Ferner können besonders zuverlässig häufige Wechsel der Schaltstellungen durchgeführt werden, was besonders vorteilhaft für eine Motorbremse einer Furthermore, frequent changes of switching positions can be performed particularly reliable, which is particularly advantageous for a motor brake
Bremskraftmaschine, insbesondere eines Lastkraftfahrzeugs, ist. Die Brake motor, in particular a truck, is. The
Ventiltriebvorrichtung ist vorzugsweise für eine Brennkraftmaschine eines Valve train device is preferably for an internal combustion engine one
Lastkraftfahrzeugs vorgesehen. Truck provided.
Das Nockenelement ist vorzugsweise drehbar und axial verschiebbar gelagert. Unter einem„drehbar und axial verschiebbar gelagerten Nockenelement" soll insbesondere ein Nockenelement verstanden werden, das drehbar und axial verschiebbar gegenüber einem Zylinderkopf oder einem anderen ortsfest angeordneten Bauteil der Brennkraftmaschine gelagert ist. Vorzugsweise nimmt ein Lagerelement das The cam element is preferably rotatably and axially displaceably mounted. A "cam element rotatably and axially displaceably mounted" is to be understood in particular as a cam element which is rotatably and axially displaceably mounted relative to a cylinder head or another stationarily arranged component of the internal combustion engine
Nockenelement drehbar auf und ist, insbesondere gemeinsam mit dem Cam member rotatably and is, in particular together with the
Nockenelement, axial verschiebbar in dem Zylinderkopf gelagert. Der Begriff„axial" ist insbesondere auf eine Hauptrotationsachse des Nockenelements bezogen, sodass der Ausdruck„axial" insbesondere eine Richtung bezeichnet, die parallel oder koaxial zu der Hauptrotationsachse verläuft. Ferner ist der Begriff„radial" insbesondere auf die Hauptrotationsachse des Nockenelements bezogen, sodass der Ausdruck„radial" insbesondere eine Richtung bezeichnet, die senkrecht zu der Hauptrotationsachse verläuft. Cam element, mounted axially displaceable in the cylinder head. The term "axial" is particularly related to a main axis of rotation of the cam member, so that the term "axial" refers in particular to a direction which is parallel or coaxial with the main axis of rotation. Furthermore, the term "radial" is particularly related to the main axis of rotation of the cam member, so that the term "radial" refers in particular to a direction which is perpendicular to the main axis of rotation.
Das Nockenelement ist vorzugsweise zur Ventilhubumschaltung axial verschiebbar. Unter einer„Ventilhubumschaltung" soll insbesondere eine diskrete Umschaltung zwischen zumindest zwei Ventilbetätigungskurven, die eine Betätigung zumindest eines Gaswechselventils definieren, verstanden werden. Unter einem The cam element is preferably axially displaceable for valve lift switching. A "valve lift changeover" is to be understood to mean, in particular, a discrete switchover between at least two valve actuation curves which define an actuation of at least one gas exchange valve
„Nockenelement" soll insbesondere ein Element verstanden werden, das zumindest einen Nocken zu einer Betätigung eines Gaswechselventils aufweist. Bevorzugt ist lediglich das erste Eingriffselement zu einer axialen Verschiebung des Nockenelements in zwei entgegengesetzte Richtungen vorgesehen. Unter einer „ersten Schaltstellung" soll in diesem Zusammenhang insbesondere eine "Cam element" is to be understood in particular an element which has at least one cam for actuating a gas exchange valve merely providing the first engagement member for axial displacement of the cam member in two opposite directions. In this context, a "first switching position" is intended in particular to mean a
Betriebsstellung verstanden werden. Unter einer„zweiten Schaltstellung" soll in diesem Zusammenhang insbesondere eine Auslösestellung und/oder eine Operating position to be understood. In this context, a "second switching position" is intended in particular to mean a triggering position and / or a triggering position
Motorbremsstellung verstanden werden. Bevorzugt ist die Rückstellkraft zumindest im Wesentlichen konstant. Unter„vorgesehen" soll insbesondere speziell ausgebildet, ausgelegt, ausgestattet und/oder angeordnet verstanden werden. Motor brake position are understood. Preferably, the restoring force is at least substantially constant. By "provided" is to be understood in particular to be specially designed, designed, equipped and / or arranged.
In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, dass die Auslösevorrichtung einen Elektromagneten umfasst, der dazu vorgesehen ist, das erste Eingriffselement in der zweiten Schaltstellung entgegen der Rückstellkraft festzuhalten. Vorteilhaft ist die Auslösevorrichtung dazu vorgesehen, eine Auslösekraft bereitzustellen, die vom Nockenelement ausgehend radial verläuft. Dadurch kann eine besonders langlebige und schnelle Aktivierung und/oder Beibehaltung der zweiten Schaltstellung erreicht werden. Dies ist besonders vorteilhaft, wenn die Ventiltriebvorrichtung für einen Motorbremsvorgang eingesetzt wird. In a further embodiment of the invention it is proposed that the triggering device comprises an electromagnet, which is provided to hold the first engagement element in the second switching position against the restoring force. Advantageously, the triggering device is provided to provide a triggering force, which extends radially starting from the cam element. As a result, a particularly long-lived and rapid activation and / or maintenance of the second switching position can be achieved. This is particularly advantageous when the valvetrain device is used for an engine braking operation.
Des Weiteren wird vorgeschlagen, dass die Auslösevorrichtung eine Rückstellfeder umfasst, die zur Ausübung der Rückstellkraft auf das erste Eingriffselement in Richtung der ersten Kulissenbahn vorgesehen ist. Vorzugsweise bildet die Rückstellfeder eine Schraubendruckfeder aus. Weiterhin vorteilhaft ist die Rückstellkraft radial in Richtung des Nockenelements ausgerichtet. Dadurch kann die erste Schaltstellung vorteilhaft ohne eine externe Energiezufuhr aktiviert und/oder beibehalten werden. In einem Störfall des Elektromagneten kann die erste Schaltstellung zuverlässig eingenommen werden. Furthermore, it is proposed that the triggering device comprises a return spring, which is provided for exerting the restoring force on the first engagement element in the direction of the first slide track. Preferably, the return spring forms a helical compression spring. Further advantageously, the restoring force is aligned radially in the direction of the cam member. As a result, the first switching position can advantageously be activated and / or maintained without an external power supply. In a fault of the electromagnet, the first switching position can be reliably taken.
Weiterhin wird vorgeschlagen, dass die Rückstellfeder dazu vorgesehen ist, das erste Eingriffselement nach einer Abschaltung des Elektromagneten in die erste Kulissenbahn zur Durchführung eines Schaltvorgangs in die erste Schaltstellung zurückzuführen. Somit kann ein Betrieb bei einem elektrischen Ausfall des Elektromagneten vorteilhaft in der ersten Schaltstellung fortgeführt werden. Weiterhin wird zur Durchführung des Schaltvorgangs in die erste Schaltstellung vorteilhaft keine externe Energie, wie insbesondere elektrische Energie, benötigt. Furthermore, it is proposed that the return spring is provided to return the first engagement element after a shutdown of the electromagnet in the first slide track for performing a switching operation in the first switching position. Thus, an operation in case of electrical failure of the electromagnet can advantageously be continued in the first switching position. Furthermore, advantageously no external energy, such as, in particular, electrical energy, is required to carry out the switching operation into the first switching position.
Ferner wird vorgeschlagen, dass die erste Kulissenbahn dazu vorgesehen ist, bei einer Drehung des Nockenelements in der ersten Schaltstellung das erste Eingriffselement oszillierend in eine Radialrichtung des Nockenelements zu bewegen. Vorzugsweise weist die erste Kulissenbahn, über einen Umfangsverlauf betrachtet, verschiedene Abstände zur Hauptrotationsachse des Nockenelements auf. Dadurch kann das erste Eingriffselement vorteilhaft in Abhängigkeit von einem Drehwinkel des Nockenelements herangeführt werden. Dadurch kann vorteilhaft eine erhöhte Betriebssicherheit erreicht werden. It is also proposed that the first slide track is provided for, upon rotation of the cam member in the first switching position, the first engagement member to oscillate in a radial direction of the cam member to move. Preferably, the first slide track, viewed over a circumferential course, different distances to the main axis of rotation of the cam member. As a result, the first engagement element can advantageously be introduced as a function of a rotation angle of the cam element. This can advantageously be achieved increased reliability.
Zudem wird vorgeschlagen, dass das erste Eingriffselement derart zur Auslösevorrichtung angeordnet ist, dass die Rückstellkraft in einem Bewegungsteilbereich des ersten Eingriffselements größer ist als eine auf das erste Eingriffselement wirkende Auslösekraft der Auslösevorrichtung. Unter einer„Auslösekraft" soll in diesem Zusammenhang insbesondere eine Haltekraft und/oder eine Magnetkraft, insbesondere eine anziehende Magnetkraft, verstanden werden. Unter einem„Bewegungsteilbereich" soll in diesem Zusammenhang insbesondere ein Teilbereich eines maximal möglichen Bewegungsbereichs verstanden werden. Die Auslösevorrichtung wirkt auf das erste Eingriffselement vorzugsweise lediglich in einem Nahbereich mit einer größeren Auslösekraft als die Rückstellkraft. Dadurch kann ein Schaltvorgang in einer ungewollten Drehwinkellage des Nockenelements vorteilhaft vermieden werden. Eine zeitliche Steuerung der Auslösevorrichtung kann vorteilhaft auch unpräzise und/oder unabhängig von einer Drehwinkellage des Nockenelements erfolgen. In addition, it is proposed that the first engagement element is arranged in such a way to the triggering device that the restoring force in a movement portion of the first engagement element is greater than a release force of the triggering device acting on the first engagement element. In this context, a "release force" is to be understood as meaning, in particular, a holding force and / or a magnetic force, in particular an attractive magnetic force, In this context, a "movement portion" is to be understood as meaning in particular a portion of a maximum possible range of motion. The triggering device preferably acts on the first engagement element only in a near zone with a greater release force than the restoring force. Thereby, a switching operation in an unwanted rotational angle position of the cam member can be advantageously avoided. A temporal control of the triggering device can advantageously also be carried out imprecisely and / or independently of a rotational angle position of the cam element.
Des Weiteren wird vorgeschlagen, dass die Versteilvorrichtung ein Hebelelement umfasst, das das erste Eingriffselement und das zweite Eingriffselement um eine gemeinsame Schwenkachse lagert. Bevorzugt verläuft die Schwenkachse parallel zur Hauptrotationsachse des Nockenelements. Dadurch kann bei einfacher konstruktiver Ausgestaltung eine Bewegung des zweiten Eingriffselements an das erste Eingriffselement gekoppelt werden. Weitere Auslösevorrichtungen können vorteilhaft vermieden werden. Eine Synchronisation zwischen einer Bewegung des ersten Eingriffselements und einer Bewegung des zweiten Eingriffselements kann besonders betriebssicher und langlebig erreicht werden. Furthermore, it is proposed that the adjustment device comprises a lever element which supports the first engagement element and the second engagement element about a common pivot axis. Preferably, the pivot axis is parallel to the main axis of rotation of the cam member. As a result, a movement of the second engagement element can be coupled to the first engagement element with a simple structural design. Other triggering devices can be advantageously avoided. A synchronization between a movement of the first engagement element and a movement of the second engagement element can be achieved particularly reliable and durable.
Ferner wird vorgeschlagen, dass die Ventiltriebvorrichtung eine Nockenwelle zur drehfesten Lagerung des Nockenelements umfasst, wobei die Verstellvorrichtung an einem freien Längsende der Nockenwelle angeordnet ist. Dadurch kann die Ventiltriebvorrichtung besonders einfach in eine Brennkraftmaschine integriert werden. Unter einem „freien Längsende" soll in diesem Zusammenhang insbesondere ein freies Ende bezo- gen auf eine Haupterstreckungsrichtung eines Elements verstanden werden. It is also proposed that the valve drive device comprises a camshaft for the rotationally fixed mounting of the cam element, wherein the adjusting device is arranged at a free longitudinal end of the camshaft. As a result, the valve drive device can be integrated particularly easily into an internal combustion engine. In this context, a "free longitudinal end" should in particular refer to a free end. be understood in a main extension direction of an element.
Weiterhin wird eine Brennkraftmaschine mit einer Motorbremse, die eine erfindungsgemäße Ventiltriebvorrichtung aufweist, vorgeschlagen. Hierbei kann eine besonders häufige Umschaltung des Nockenelements zum zuverlässigen Aktivieren einer Motorbremse erfolgen. Furthermore, an internal combustion engine with an engine brake, which has a valve drive device according to the invention, proposed. In this case, a particularly frequent switching of the cam element for reliably activating a motor brake can take place.
Zudem wird ein Verfahren zur axialen Verschiebung eines sich drehenden In addition, a method for axial displacement of a rotating
Nockenelements in zwei entgegengesetzte Richtungen von einer ersten Schaltstellung in eine zweite Schaltstellung vorgeschlagen, mit einer Verstellvorrichtung, wobei ein erstes Eingriffselement mit einem zweiten Eingriffselement zwangsgekoppelt ist und wobei das erste Eingriffselement von einer Auslösevorrichtung in der zweiten Cam element in two opposite directions from a first switching position proposed in a second switching position, with an adjusting device, wherein a first engaging element is positively coupled to a second engaging element and wherein the first engaging member of a triggering device in the second
Schaltstellung entgegen einer Rückstellkraft festgehalten wird. Dadurch kann eine besonders hohe Betriebssicherheit erreicht werden. Shift position is held against a restoring force. As a result, a particularly high level of operational reliability can be achieved.
Weitere Vorteile ergeben sich aus der folgenden Figurenbeschreibung. In den Figuren 1 bis 9 ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Figuren, die Further advantages will become apparent from the following description of the figures. In the figures 1 to 9 an embodiment of the invention is shown. The figures, the
Figurenbeschreibung und die Ansprüche enthalten zahlreiche Merkmale in The description of the figures and the claims contain numerous features
Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen. 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 isometrische Ansicht einer Ventiltriebvorrichtung, 1 is an isometric view of a valvetrain device,
Fig. 2 eine weitere isometrische Ansicht der Ventiltriebvorrichtung,  2 shows a further isometric view of the valve drive device,
Fig. 3 eine Seitenansicht der Ventiltriebvorrichtung in einem maximalen  Fig. 3 is a side view of the valve drive device in a maximum
Oszillationswinkel,  oscillation,
Fig. 4 die Ventiltriebvorrichtung in einer Schnittdarstellung durch IV - IV, 4 shows the valve drive device in a sectional view through IV - IV,
Fig. 5 eine weitere Seitenansicht der Ventiltriebvorrichtung in einem minimalen Fig. 5 is another side view of the valve drive device in a minimum
Oszillationswinkel,  oscillation,
Fig. 6 eine Schnittdarstellung der Ventiltriebvorrichtung in einem 6 is a sectional view of the valve drive device in one
Auslösevorgang,  Release operation,
Fig. 7 eine weitere Schnittdarstellung der Ventiltriebvorrichtung in einem  Fig. 7 is a further sectional view of the valve drive device in one
Einrastvorgang, Fig. 8 eine weitere Seitenansicht der Ventiltriebvorrichtung in einem latching operation, Fig. 8 is another side view of the valve drive device in one
Absetzvorgang und  Settling process and
Fig. 9 eine weitere Seitenansicht der Ventiltriebvorrichtung in einem Fig. 9 is another side view of the valve drive device in a
Ausschaltvorgang.  Off operation.
Die Figuren 1 und 2 zeigen eine Ventiltriebvorrichtung für eine nicht näher gezeigte Brennkraftmaschine. Die Brennkraftmaschine weist eine Motorbremse auf. Die Ventiltriebvorrichtung umfasst ein axial verschiebbares Nockenelement 10. Die Ventiltriebvorrichtung weist eine Nockenwelle 22 auf. Die Nockenwelle 22 ist zur drehfesten Lagerung des Nockenelements 10 vorgesehen. Dazu ist das Figures 1 and 2 show a valve drive device for an internal combustion engine not shown in detail. The internal combustion engine has an engine brake. The valve drive device comprises an axially displaceable cam element 10. The valve drive device has a camshaft 22. The camshaft 22 is provided for the rotationally fixed mounting of the cam member 10. That's it
Nockenelement 10 drehfest mit der Nockenwelle 22 verbunden. Das NockenelementCam member 10 rotatably connected to the camshaft 22. The cam element
10 ist um eine Hauptrotationsachse 23 drehbar gelagert. Die Nockenwelle 22 ist um die Hauptrotationsachse 23 drehbar gelagert. Die Nockenwelle 22 weist zwei unterschiedlich ausgestaltete, nicht näher gezeigte Nocken auf. Die unterschiedlichen Nocken weisen dabei einen gleichen Grundkreisradius auf. Die unterschiedlichen Nocken sind jeweils für unterschiedliche Betriebsmodi vorgesehen, wie insbesondere für einen Befeuerungsmodus und für einen Motorbremsmodus. 10 is rotatably mounted about a main axis of rotation 23. The camshaft 22 is rotatably supported about the main rotation axis 23. The camshaft 22 has two differently configured, not shown in detail cam. The different cams have a same base circle radius. The different cams are each provided for different operating modes, such as in particular for a firing mode and for an engine braking mode.
Die Ventiltriebvorrichtung weist eine Versteilvorrichtung 11 auf. Die VersteilvorrichtungThe valve drive device has an adjusting device 11. The adjusting device
1 1 umfasst ein erstes Eingriffselement 12. Das erste Eingriffselement 12 ist dazu vorgesehen, das Nockenelement 10 in eine erste Schaltstellung axial zu verschieben. Das erste Eingriffselement 12 ist zylinderförmig ausgebildet. 1 1 comprises a first engagement element 12. The first engagement element 12 is provided for axially displacing the cam element 10 into a first shift position. The first engagement element 12 is cylindrical.
Die Versteilvorrichtung 11 weist eine erste Kulissenbahn 14 auf. Die erste The adjusting device 11 has a first slide track 14. The first
Kulissenbahn 14 weist unterschiedliche Segmente auf. Ein Segment bildet ein erstes Einspursegment 27 aus. Ein weiteres Segment bildet ein erstes Verstellsegment 28 aus. Das erste Einspursegment 27 verläuft in Umfangsrichtung und weist drei in Umfangsrichtung um 120° versetzte Erhebungen auf. Die erste Kulissenbahn 14 weist somit, über einen Umfangsverlauf betrachtet, verschiedene Abstände zur Sliding track 14 has different segments. A segment forms a first engagement segment 27. Another segment forms a first adjustment segment 28. The first Einspursegment 27 extends in the circumferential direction and has three circumferentially offset by 120 ° elevations. The first slide track 14 thus has, viewed over a circumferential course, different distances to
Hauptrotationsachse 23 des Nockenelements 10 auf. Läuft das erste EingriffselementMain axis of rotation 23 of the cam member 10 on. Runs the first engagement element
12 auf dem ersten Einspursegment 27, führt es während einer Rotation des 12 on the first one-track segment 27, it performs during a rotation of the
Nockenelements 10 eine oszillierende Bewegung aus. Einen maximalen Cam member 10 is an oscillating movement. A maximum
Oszillationswinkel erreicht das erste Eingriffselement 12 auf einer der Erhebungen. Einen minimalen Oszillationswinkel erreicht das erste Eingriffselement 12 bei einer Mitte zwischen zwei Erhebungen. Die erste Kulissenbahn 14 ist dazu vorgesehen, bei einer Drehung des Nockenelements 10 in der ersten Schaltstellung das erste Eingriffselement 12 oszillierend in eine Radialrichtung 19 des Nockenelements 10 zu bewegen. Oscillation angle reaches the first engagement element 12 on one of the elevations. A minimum oscillation angle reaches the first engagement element 12 at a middle between two elevations. The first slide track 14 is provided, upon rotation of the cam member 10 in the first switching position, the first Engagement member 12 oscillating in a radial direction 19 of the cam member 10 to move.
Neben dem ersten Einspursegment 27 schließt das erste Verstellsegment 28 an. Das erste Verstellsegment 28 weist eine Richtung mit einer radialen und einer axialen Komponente auf. Durch die axiale Komponente kann das Nockenelement 10 axial verschoben werden. Eine radiale Tiefe des ersten Verstellsegments 28 entspricht einer radialen Tiefe des ersten Einspursegments 27. Eine radiale Höhe einer ersten In addition to the first Einspursegment 27 includes the first adjustment segment 28. The first adjustment segment 28 has a direction with a radial and an axial component. Due to the axial component, the cam member 10 can be moved axially. A radial depth of the first adjustment segment 28 corresponds to a radial depth of the first engagement segment 27. A radial height of a first
Führungswandung 29 des ersten Verstellsegments 28 ist gleichbleibend. Guide wall 29 of the first adjustment segment 28 is constant.
Die Verstellvorrichtung 11 umfasst ein zweites Eingriffselement 13. Das zweite Eingriffselement 13 ist dazu vorgesehen, das Nockenelement 10 in eine zweite Schaltstellung axial zu verschieben. Die Versteilvorrichtung 11 ist an einem freien Längsende 26 der Nockenwelle 22 angeordnet. Das zweite Eingriffselement 13 ist zylinderförmig ausgebildet. The adjusting device 11 comprises a second engagement element 13. The second engagement element 13 is provided for axially displacing the cam element 10 into a second switching position. The adjusting device 11 is arranged at a free longitudinal end 26 of the camshaft 22. The second engagement element 13 is cylindrical.
Die Verstellvorrichtung 11 weist eine zweite Kulissenbahn 15 auf. Die zweite Kulissenbahn 15 ist axial zur ersten Kulissenbahn 14 beabstandet. Die zweite Kulissenbahn 15 weist unterschiedliche Segmente auf. Ein Segment bildet ein zweites Einspursegment 30 aus. Das zweite Einspursegment 30 verläuft in Umfangsrichtung und weist einen in Umfangsrichtung gleichbleibenden Abstand zur Hauptrotationsachse 23 auf. Neben dem zweiten Einspursegment 30 schließt ein zweites Verstellsegment 31 an. Das zweite Verstellsegment 31 weist eine Richtung mit einer radialen und einer axialen Komponente auf. Durch die axiale Komponente kann das Nockenelement 10 axial verschoben werden. Das zweite Verstellsegment 31 ist weiter von der Hauptrotationsachse 23 beabstandet als das zweite Einspursegment 30. The adjusting device 11 has a second slide track 15. The second slide track 15 is axially spaced from the first slide track 14. The second slide track 15 has different segments. One segment forms a second single track segment 30. The second Einspursegment 30 extends in the circumferential direction and has a circumferentially constant distance to the main axis of rotation 23. In addition to the second Einspursegment 30 includes a second adjustment segment 31. The second adjustment segment 31 has a direction with a radial and an axial component. Due to the axial component, the cam member 10 can be moved axially. The second adjustment segment 31 is further spaced from the main rotation axis 23 than the second engagement segment 30.
Zwischen dem zweiten Einspursegment 30 und dem zweiten Verstellsegment 31 ist über einen gesamten Umfang eine Stufe ausgebildet. Eine Höhe einer zweiten Führungswandung 32 des zweiten Verstellsegments 31 nimmt in Umfangsrichtung ab. Das zweite Verstellsegment 31 ist dazu vorgesehen, bei einer Aktivierung der zweiten Schaltstellung das zweite Eingriffselement 13 entlang der zweiten Führungswandung 32 in das Einspursegment 30 zu führen. Das Nockenelement 10 wird dabei axial verschoben. Die zweite Führungswandung 32 schließt einen spitzen Winkel zu einer Hauptrotationsebene des Nockenelements 10 ein. Die Hauptrotationsebene verläuft senkrecht zur Hauptrotationsachse 23. Das erste Eingriffselement 12 ist in der ersten Schaltstellung in der ersten Kulissenbahn 14 geführt. Die Ventiltriebvorrichtung befindet sich hierbei in einem Befeuerungsmodus. Das erste Eingriffselement 12 wird auf der ersten Kulissenbahn 14 in einer radialen Richtung auf und ab bewegt. Die Figur 3 zeigt das erste Between the second Einspursegment 30 and the second adjustment segment 31 a step is formed over an entire circumference. A height of a second guide wall 32 of the second adjustment segment 31 decreases in the circumferential direction. The second adjustment segment 31 is provided to guide the second engagement element 13 along the second guide wall 32 into the engagement segment 30 when the second shift position is activated. The cam member 10 is thereby displaced axially. The second guide wall 32 includes an acute angle to a main rotation plane of the cam member 10. The main rotation plane is perpendicular to the main axis of rotation 23. The first engagement element 12 is guided in the first shift position in the first slide track 14. The valve drive device is in a firing mode. The first engagement element 12 is moved up and down on the first slide track 14 in a radial direction. FIG. 3 shows the first one
Eingriffselement 12 mit einem maximalen Oszillationswinkel. Dabei ist das erste Eingriffselement 12 der Hauptrotationsachse 23 am nächsten. Wie in der Figur 4 gezeigt, befindet sich erste Eingriffselement 12 zwischen zwei Erhebungen des ersten Einspursegments 27. Eine der Erhebungen drückt das erste Eingriffselement 12 bei einer weiteren Drehung des Nockenelements 10 weg von der Hauptrotationsachse 23. Die Figur 5 zeigt das erste Eingriffselement 12 mit einem minimalen Oszillationswinkel. Dabei ist das erste Eingriffselement 12 am weitesten von der Hauptrotationsachse 23 beabstandet. Das erste Eingriffselement 12 liegt dabei auf einer der Erhebungen des ersten Einspursegments 27. Engagement element 12 with a maximum oscillation angle. In this case, the first engagement element 12 of the main axis of rotation 23 is closest. As shown in FIG. 4, the first engagement element 12 is located between two elevations of the first engagement segment 27. One of the elevations pushes the first engagement element 12 away from the main rotation axis 23 during further rotation of the cam element 10. FIG. 5 shows the first engagement element 12 a minimum oscillation angle. In this case, the first engagement element 12 is furthest from the main axis of rotation 23. The first engagement element 12 lies on one of the elevations of the first Einspursegments 27th
Das zweite Eingriffselement 13 ist während des Befeuerungsmodus von der zweiten Kulissenbahn 15 beabstandet. Das erste Eingriffselement 12 ist mit dem zweiten Eingriffselement 13 zwangsgekoppelt ausgebildet. Die Versteilvorrichtung 11 umfasst ein Hebelelement 33. Das Hebelelement 33 lagert das erste Eingriffselement 12 und das zweite Eingriffselement 13 um eine gemeinsame Schwenkachse 21. Die gemeinsame Schwenkachse 21 verläuft parallel zur Hauptrotationsachse 23 des Nockenelements 10. The second engagement element 13 is spaced apart from the second slide track 15 during the firing mode. The first engagement element 12 is positively coupled to the second engagement element 13. The adjusting device 11 comprises a lever element 33. The lever element 33 supports the first engagement element 12 and the second engagement element 13 about a common pivot axis 21. The common pivot axis 21 extends parallel to the main axis of rotation 23 of the cam element 10.
Die Auslösevorrichtung 16 umfasst eine Rückstellfeder 18. Die Rückstellfeder 18 belastet das erste Eingriffselement 12 mit einer Rückstellkraft. Die Rückstellfeder 18 ist dabei zur Ausübung der Rückstellkraft auf das erste Eingriffselement 12 in Richtung der ersten Kulissenbahn 14 vorgesehen. Die Rückstellfeder 18 bildet eine Schraubendruckfeder aus. Die Rückstellkraft ist radial in Richtung des Nockenelements 10 ausgerichtet. The triggering device 16 comprises a return spring 18. The return spring 18 loads the first engagement element 12 with a restoring force. The return spring 18 is provided for exerting the restoring force on the first engagement element 12 in the direction of the first slide track 14. The return spring 18 forms a helical compression spring. The restoring force is aligned radially in the direction of the cam element 10.
Die Versteilvorrichtung 11 umfasst eine Auslösevorrichtung 16. Die Auslösevorrichtung 16 ist zur Änderung des Betriebsmodus vorgesehen. Genauer gesagt ist die Auslösevorrichtung 16 zur Aktivierung eines Motorbremsmodus vorgesehen. Die Auslösevorrichtung 16 hält hierfür das erste Eingriffselement 12 entgegen der Rückstellkraft fest (Fig. 6). Hierzu umfasst die Auslösevorrichtung 16 einen Elektromagneten 17. Der Elektromagnet 17 ist dazu vorgesehen, das erste Eingriffselement 12 in der zweiten Schaltstellung entgegen der Rückstellkraft festzuhalten. Der Elektromagnet 17 ist über ein Kabel 34 elektrisch ansteuerbar. Die Auslösevorrichtung 16 ist dazu vorgesehen, eine Auslösekraft bereitzustellen, die vom Nockenelement 10 ausgehend radial verläuft. Die Auslösekraft entspricht in diesem Ausführungsbeispiel einer Magnethaltekraft. Der Elektromagnet 17 ist, radial von der Hauptrotationsachse 23 ausgehend, hinter dem ersten Eingriffselement 12 angeordnet. Der Elektromagnet 17 zieht das erste Eingriffselement 12 in einem aktivierten Zustand an. Der Elektromagnet 17 umfasst eine Magnetspule 24. Der Elektromagnet 17 umfasst ferner ein Magnetgehäuse 25, in welchem die Magnetspule 24 angeordnet ist. Die Rückstellfeder 18 ist innerhalb des Magnetgehäuses 25 angeordnet. Die Rückstellfeder 18 ist von der Magnetspule 24 umgeben. Die Rückstellfeder 18 ist koaxial zur Magnetspule 24 angeordnet. The adjusting device 11 comprises a triggering device 16. The triggering device 16 is provided for changing the operating mode. More specifically, the tripping device 16 is provided for activating an engine braking mode. For this purpose, the triggering device 16 holds the first engagement element 12 against the restoring force (FIG. 6). For this purpose, the triggering device 16 comprises an electromagnet 17. The electromagnet 17 is provided to hold the first engagement element 12 in the second switching position against the restoring force. The electromagnet 17 is electrically actuated via a cable 34. The triggering device 16 is provided to provide a triggering force that extends radially from the cam element 10. The release force corresponds to a magnetic holding force in this embodiment. The electromagnet 17 is arranged radially behind the first engagement element 12 starting from the main rotational axis 23. The electromagnet 17 attracts the first engagement element 12 in an activated state. The electromagnet 17 comprises a magnet coil 24. The electromagnet 17 further comprises a magnet housing 25 in which the magnet coil 24 is arranged. The return spring 18 is disposed within the magnet housing 25. The return spring 18 is surrounded by the magnetic coil 24. The return spring 18 is arranged coaxially with the magnet coil 24.
Das erste Eingriffselement 12 ist dabei derart zur Auslösevorrichtung 16 angeordnet, dass die Rückstellkraft in einem Bewegungsteilbereich 20 des ersten Eingriffselements 12 größer ist als eine auf das erste Eingriffselement 12 wirkende Auslösekraft der Auslösevorrichtung 16. Ein Abstand zwischen dem Elektromagneten 17 und eine Magnetkraftkraft des Elektromagneten 17 sind dabei von einem Fachmann so ausgelegt, dass die Auslösekraft die Rückstellkraft nur im Bereich des minimalen Oszillationswinkels übersteigt. The first engagement element 12 is arranged in such a way to the triggering device 16, that the restoring force in a moving portion 20 of the first engaging member 12 is greater than acting on the first engaging member 12 release force of the triggering device 16. A distance between the electromagnet 17 and a magnetic force of the electromagnet 17th are designed by a specialist so that the release force exceeds the restoring force only in the range of the minimum oscillation angle.
Wird der Elektromagnet 17 beispielsweise im Bereich des maximalen Oszillationswinkel aktiviert, löst die Auslösevorrichtung 16 nicht aus, da die auf das Eingriffselement 12 wirkende Magnetkraft geringer ist als die Rückstellkraft der Rückstellfeder 18. Mit einem abnehmenden Oszillationswinkel und der damit verbundenen Annäherung des ersten Eingriffselements 12 an den Elektromagneten 17 vergrößert sich die Wirkung der Magnetkraft auf das erste Eingriffselement 12 und übersteigt die Rückstellkraft schließlich in einem Nahbereich. Daraufhin wird das erste Eingriffselement 12 an den Elektromagneten 17 herangezogen. If the electromagnet 17 is activated, for example, in the range of the maximum oscillation angle, the triggering device 16 does not trigger, since the magnetic force acting on the engagement element 12 is less than the restoring force of the return spring 18. With a decreasing oscillation angle and the associated approach of the first engagement element 12 the electromagnet 17 increases the effect of the magnetic force on the first engaging element 12 and finally exceeds the restoring force in a near area. Then, the first engagement element 12 is used to the electromagnet 17.
Durch das Hebelelement 33 wird das zweite Eingriffselement 13 an die zweite Kulissenbahn 15 angelegt. Das Nockenelement 10 wird durch Anlage des zweiten Eingriffselements 13 an der zweiten Führungswandung 32 axial verschoben und bewegt sich dann in das zweite Einspursegment 30. Dadurch ist das Nockenelement 10 axial verriegelt (Figur 7). Die zweite Schaltstellung ist nun eingenommen. Das erste Eingriffselement 13 liegt in der zweiten Schaltstellung am Elektromagneten 17 an. Zum Zurückschalten in die erste Schaltstellung wird der Elektromagnet 17 abgeschaltet. Die Rückstellfeder 18 ist dazu vorgesehen, das erste Eingriffselement 12 nach der Abschaltung des Elektromagneten 17 in die erste Kulissenbahn 14 zur Durchführung des Schaltvorgangs in die erste Schaltstellung zurückzuführen. Bei einem Ausfall des Elektromagneten 17 erfolgt ebenfalls die Durchführung des Schaltvorgangs in die erste Schaltstellung. By the lever member 33, the second engagement member 13 is applied to the second slide track 15. The cam member 10 is displaced axially by abutment of the second engagement member 13 on the second guide wall 32 and then moves into the second Einspursegment 30. Thereby, the cam member 10 is axially locked (Figure 7). The second switching position is now taken. The first engagement element 13 is in the second switching position on the electromagnet 17. To switch back to the first switching position, the electromagnet 17 is turned off. The return spring 18 is provided to return the first engagement element 12 after the switching off of the electromagnet 17 in the first slide track 14 for performing the switching operation in the first switching position. In case of failure of the electromagnet 17 also carried out the implementation of the switching operation in the first switching position.
Wie in der Figur 8 gezeigt, drückt die Rückstellfeder 18 das erste Eingriffselement 12 nach der Abschaltung des Elektromagneten 17 auf die erste Kulissenbahn 14. Das erste Eingriffselement 12 befindet sich dabei auf axialer Höhe des ersten As shown in Figure 8, the return spring 18 presses the first engagement element 12 after the switching off of the electromagnet 17 on the first slide track 14. The first engagement element 12 is located at the axial height of the first
Verstellsegments 28. Bei einem Erreichen der ersten Führungswandung 29 wird das Nockenelement 10 axial verschoben (Figur 9). Zuletzt befindet sich das Verstellsegments 28. When reaching the first guide wall 29, the cam member 10 is axially displaced (Figure 9). Last is the
Nockenelement 10 im ersten Einspursegment 27. Cam element 10 in the first Einspursegment 27th
Bezugszeichenliste Nockenelement Reference numeral list cam element
Verstellvorrichtung adjustment
Eingriffselement engaging member
Eingriffselement engaging member
Kulissenbahn link path
Kulissenbahn link path
Auslösevorrichtung triggering device
Elektromagnet electromagnet
Rückstellfeder Return spring
Radialrichtung radial direction
Bewegungsteilbereich Movement subregion
Schwenkachse swivel axis
Nockenwelle camshaft
Hauptrotationsachse Main axis of rotation
Magnetspule solenoid
Magnetgehäuse magnet housing
Längsende longitudinal end
Einspursegment Einspursegment
Verstellsegment adjusting segment
Führungswandung guide wall
Einspursegment Einspursegment
Verstellsegment adjusting segment
Führungswandung guide wall
Hebelelement lever member
Kabel electric wire

Claims

Patentansprüche  claims
Ventiltriebvorrichtung für eine Brennkraftmaschine, mit einem axial verschiebbaren Nockenelement (10) und mit einer Verstellvorrichtung (1 1), die ein erstes Valve train device for an internal combustion engine, with an axially displaceable cam member (10) and with an adjusting device (1 1), the first
Eingriffselement (12) umfasst, das dazu vorgesehen ist, das Nockenelement (10) in eine erste Schaltstellung axial zu verschieben, und die ein zweites Eingriffselement (13) umfasst, das dazu vorgesehen ist, das Nockenelement (10) in eine zweite Schaltstellung axial zu verschieben, wobei die Verstellvorrichtung (11) eine erste Kulissenbahn (14) aufweist, in welcher das erste Eingriffselement (12) in der ersten Schaltstellung geführt ist, und eine zweite Kulissenbahn (15) aufweist, in welcher das zweite Eingriffselement (13) in der zweiten Schaltstellung geführt ist, wobei das erste Eingriffselement (12) mit dem zweiten Eingriffselement (13) zwangsgekoppelt ausgebildet ist, Engaging member (12) adapted to axially displace the cam member (10) to a first shift position, and comprising a second engagement member (13) arranged to axially urge the cam member (10) to a second shift position shift, wherein the adjusting device (11) has a first slide track (14), in which the first engagement element (12) is guided in the first switching position, and a second slide track (15), in which the second engagement element (13) in the second switching position is guided, wherein the first engagement element (12) with the second engagement element (13) is positively coupled,
dadurch gekennzeichnet, dass characterized in that
die Verstellvorrichtung (1 1) eine Auslösevorrichtung (16) umfasst, die dazu vorgesehen ist, das erste Eingriffselement (12) in der zweiten Schaltstellung entgegen einer Rückstellkraft festzuhalten. the adjusting device (1 1) comprises a triggering device (16) which is provided to hold the first engaging element (12) in the second switching position counter to a restoring force.
Ventiltriebvorrichtung nach Anspruch 1 , Valve train device according to claim 1,
dadurch gekennzeichnet, dass characterized in that
die Auslösevorrichtung (16) einen Elektromagneten (17) umfasst, der dazu vorgesehen ist, das erste Eingriffselement (12) in der zweiten Schaltstellung entgegen der Rückstellkraft festzuhalten. Ventiltriebvorrichtung nach Anspruch 1 oder 2, the triggering device (16) comprises an electromagnet (17) which is provided to hold the first engagement element (12) in the second switching position counter to the restoring force. Valve train device according to claim 1 or 2,
dadurch gekennzeichnet, dass characterized in that
die Auslösevorrichtung (16) eine Rückstellfeder (18) umfasst, die zur Ausübung der Rückstellkraft auf das erste Eingriffselement (12) in Richtung der ersten the triggering device (16) comprises a return spring (18) which is used to exert the restoring force on the first engagement element (12) in the direction of the first
Kulissenbahn (14) vorgesehen ist. Sliding track (14) is provided.
Ventiltriebvorrichtung nach den Ansprüchen 2 und 3, Valve train device according to claims 2 and 3,
dadurch gekennzeichnet, dass characterized in that
die Rückstellfeder (18) dazu vorgesehen ist, das erste Eingriffselement (12) nach einer Abschaltung des Elektromagneten (17) in die erste Kulissenbahn (14) zur Durchführung eines Schaltvorgangs in die erste Schaltstellung zurückzuführen. the return spring (18) is provided for returning the first engagement element (12) to the first shift path (14) after a switch-off of the electromagnet (17) into the first slide track (14) for carrying out a shift operation.
Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche, Valve train device according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
die erste Kulissenbahn (14) dazu vorgesehen ist, bei einer Drehung des the first slide track (14) is provided, upon rotation of the
Nockenelements (10) in der ersten Schaltstellung das erste Eingriffselement (12) oszillierend in eine Radialrichtung (19) des Nockenelements (10) zu bewegen. Cam element (10) in the first switching position to move the first engagement member (12) oscillating in a radial direction (19) of the cam member (10).
Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche, Valve train device according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
das erste Eingriffselement (12) derart zur Auslösevorrichtung (16) angeordnet ist, dass die Rückstellkraft in einem Bewegungsteilbereich (20) des ersten the first engagement element (12) is arranged in such a way to the release device (16) that the restoring force in a movement portion (20) of the first
Eingriffselements (12) größer ist als eine auf das erste Eingriffselement (12) wirkende Auslösekraft der Auslösevorrichtung (16). Engagement element (12) is greater than one on the first engagement element (12) acting release force of the trigger device (16).
Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche, Valve train device according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
die Verstellvorrichtung (1 1) ein Hebelelement (33) umfasst, das das erste the adjusting device (1 1) comprises a lever element (33), which is the first
Eingriffselement (12) und das zweite Eingriffselement (13) um eine gemeinsame Schwenkachse (21) lagert. Engagement element (12) and the second engagement element (13) about a common pivot axis (21) superimposed.
8. Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche, gekennzeichnet durch 8. Valve drive device according to one of the preceding claims, characterized by
eine Nockenwelle (22) zur drehfesten Lagerung des Nockenelements (10), wobei die Versteilvorrichtung (11) an einem freien Längsende (26) der Nockenwelle (22) angeordnet ist.  a camshaft (22) for non-rotatably supporting the cam member (10), wherein the adjusting device (11) at a free longitudinal end (26) of the camshaft (22) is arranged.
9. Brennkraftmaschine mit einer Motorbremse, die eine Ventiltriebvorrichtung nach einem der vorhergehenden Ansprüche aufweist. 9. Internal combustion engine with an engine brake, which has a valve drive device according to one of the preceding claims.
10. Verfahren zur axialen Verschiebung eines sich drehenden Nockenelements (10) von einer ersten Schaltstellung in eine zweite Schaltstellung, mit einer 10. A method for the axial displacement of a rotating cam member (10) from a first switching position to a second switching position, with a
Versteilvorrichtung (11), wobei ein erstes Eingriffselement (12) mit einem zweiten Eingriffselement (13) zwangsgekoppelt ist,  Adjusting device (11), wherein a first engagement element (12) is forcibly coupled to a second engagement element (13),
dadurch gekennzeichnet, dass  characterized in that
das erste Eingriffselement (12) von einer Auslösevorrichtung (16) in der zweiten Schaltstellung entgegen einer Rückstellkraft festgehalten wird.  the first engagement element (12) by a triggering device (16) is held in the second switching position against a restoring force.
EP15804071.7A 2014-12-23 2015-12-02 Valve drive device for an internal combustion engine Not-in-force EP3237730B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014019573.2A DE102014019573A1 (en) 2014-12-23 2014-12-23 Valve train device for an internal combustion engine
PCT/EP2015/002421 WO2016102042A1 (en) 2014-12-23 2015-12-02 Valve drive device for an internal combustion engine

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EP3237730A1 true EP3237730A1 (en) 2017-11-01
EP3237730B1 EP3237730B1 (en) 2018-09-26

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EP (1) EP3237730B1 (en)
JP (1) JP6357590B2 (en)
CN (1) CN107109966B (en)
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WO (1) WO2016102042A1 (en)

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DE102017009350A1 (en) 2017-10-09 2018-04-19 Daimler Ag Valve train device, in particular for an internal combustion engine
DE102018110705A1 (en) * 2018-05-04 2019-11-07 Man Truck & Bus Se Variable valve train
DE102018110714A1 (en) * 2018-05-04 2019-11-07 Man Truck & Bus Se Variable valve train
AT521446B1 (en) 2018-06-21 2021-12-15 Avl List Gmbh VALVE GEAR DEVICE FOR AN INTERNAL ENGINE

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US10443454B2 (en) 2019-10-15
DE102014019573A1 (en) 2016-06-23
US20170362964A1 (en) 2017-12-21
WO2016102042A1 (en) 2016-06-30
EP3237730B1 (en) 2018-09-26
CN107109966A (en) 2017-08-29
JP6357590B2 (en) 2018-07-11
CN107109966B (en) 2019-07-05

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