EP3721062A1 - Drive device for adjusting a control shaft of a fully variable valve drive of an internal combustion engine - Google Patents

Drive device for adjusting a control shaft of a fully variable valve drive of an internal combustion engine

Info

Publication number
EP3721062A1
EP3721062A1 EP18811782.4A EP18811782A EP3721062A1 EP 3721062 A1 EP3721062 A1 EP 3721062A1 EP 18811782 A EP18811782 A EP 18811782A EP 3721062 A1 EP3721062 A1 EP 3721062A1
Authority
EP
European Patent Office
Prior art keywords
control shaft
variable valve
internal combustion
combustion engine
adjusting
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.)
Withdrawn
Application number
EP18811782.4A
Other languages
German (de)
French (fr)
Inventor
Michael Breuer
Stefan Moormann
Christoph Sadowski
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP3721062A1 publication Critical patent/EP3721062A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/352—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using bevel or epicyclic gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/352—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using bevel or epicyclic gear
    • F01L2001/3521—Harmonic drive of flexspline type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0073—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "Delphi" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L2013/10—Auxiliary actuators for variable valve timing
    • F01L2013/103—Electric motors
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators

Definitions

  • the present invention relates to a drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine having an electric motor with a drive shaft and coupled to the electric motor gear, wherein an output member of the transmission is coupled to a control shaft of a fully variable valve train.
  • Mechanically controllable, fully variable valve trains are known in various designs from the prior art and serve the reduction of fuel consumption and the reduction of emissions.
  • a control shaft is used to change the valve stroke. By changing the valve lift as a function of the load of the internal combustion engine, an increase in efficiency is achieved.
  • a fully variable valve train with input and output valves which can be actuated by a facial expressions.
  • the facial expressions include a control shaft with cams, which act on the valve train, so that by rotation of the control shaft, the stroke of the valves can be adjusted both in the lifting height and in its phase.
  • the rotation of the control shaft via an electronic actuator which is arranged radially to the control shaft and consists of a worm gear, wherein the worm is arranged on the output shaft of the electric motor and acts on a gear which is fixed on the control shaft.
  • a disadvantage is the space requirement of the radially mounted actuator including the transmission, since the space is limited radially to the control shaft by other components of the internal combustion engine.
  • the invention is therefore based on the object to develop a drive for the control shaft, which reduces the indicated disadvantage of the required space requirement in the radial direction to the control shaft and thus saves the limited space in the control shaft in the radial direction
  • the drive shaft of the electric motor and the control shaft is aligned coaxially with each other, so that additional radial space is saved and storage is facilitated.
  • the waves are arranged in alignment with each other.
  • an eccentric gear is used as the transmission, since these eccentric gear have a compact design and a high reduction ratio. Furthermore, these transmissions have a long service life and a small installation space and high reduction ratios can be realized in a few gear stages.
  • the drive shaft of the electric motor is arranged in the axial extension of the control shaft, so that no offset between The drive shaft and the control shaft is created so that space is saved and a direct force transmission exists.
  • the ring gear of the transmission is fixed on one end of the control shaft and serves as a driven member.
  • the eccentric is fixed to the drive shaft of the electric motor or the eccentric is formed integrally with the drive shaft, whereby components are saved, so that the drive is less expensive.
  • the drive shaft of the electric motor is mounted in the control shaft.
  • transverse forces are absorbed by the bearings of the control shaft, so that it is possible to dispense with additional bearing points for mounting the drive shaft, whereby the actuator has a shorter axial length.
  • the planet gears are mounted on the eccentric, since thus transverse and bending forces are reduced and a longer life is achieved.
  • Preferred is the use of an electronically commutated internal rotor motor, which has a low power consumption with low wear.
  • FIG. 1 shows a sectional view of a drive device according to the invention for rotating a control shaft.
  • the drive device has an electric motor 10, which is arranged in a motor housing 12 and is designed as an electronically commutated internal rotor motor.
  • the electric motor consists of a stator 14 with windings 16, which are energized to generate a rotational movement of a rotor 18 of the electric motor 10.
  • the rotor is mounted on a drive shaft 20 whose end protrudes from the motor housing 12 through an opening 15 in the motor housing 12 into a space 13 which is closed by a valve cover 24 of an internal combustion engine and in which a control shaft 22 of a variable valve train is arranged. In a recess at the end of the control shaft 22 protrudes the end of the drive shaft 20 and is supported there by means of a needle bearing.
  • an eccentric 27 is fixed or integrally formed with the drive shaft 20.
  • the eccentric 27 carries a needle bearing 28, via which a first planetary gear 32 and a second planetary gear 30 are mounted, which are arranged rotationally fixed to each other.
  • the second planetary gear 30 has, in the radially inner region, an annular extension 34 extending axially into an inner opening of the first planetary gear 32, on which the first one Planet wheel 32 is pressed or otherwise secured.
  • the first planet gear 32 meshes with a first ring gear 36 which is fixed to an inner wall of the valve cover 24.
  • the second planetary gear 30 is coupled to a driven member 38 which is configured as a second ring gear fixedly disposed within an axially extending annular projection of the control shaft 22 extending from a plate-shaped member fixedly disposed on the end of the control shaft 22 is or is integrally formed with this.
  • a driven member 38 which is configured as a second ring gear fixedly disposed within an axially extending annular projection of the control shaft 22 extending from a plate-shaped member fixedly disposed on the end of the control shaft 22 is or is integrally formed with this.
  • an electronically commutated internal rotor motor can be used, which is arranged parallel to the transmission, whereby no installation space is necessary radially to the valve train and the actuator is arranged completely in the axial direction of extent.
  • an at least two-stage planetary gear can be used, wherein a first sun gear is fixed to the drive shaft or made in one piece with this. By a rotationally fixed coupling of the first planetary gear with the second planetary gear, a rotation of the drive shaft is transmitted to the rotatably mounted in the control shaft second ring gear.

Abstract

Drive devices for adjusting a control shaft (22) of a fully variable valve drive of an internal combustion engine, comprising an electric motor (10) with a driveshaft (20) and a transmission (26) coupled to the electric motor (10), are known, wherein an output element (38) of the transmission (26) is coupled to a control shaft (22) of a fully variable valve drive. The aim of the invention is to arrange such a drive axially to the control shaft (22) such that no installation space is required radially to the valve drive. According to the invention, this is achieved in that the rotational axes of the transmission (26) are arranged parallel to the control shaft (22) and the driveshaft (20) of the electric motor (10).

Description

B E S C H R E I B U N G Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebs einer Verbrennungskraftmaschine  A drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine
Die vorliegende Erfindung betrifft eine Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebs einer Verbrennungskraftmaschine mit einem Elektromotor mit einer Antriebswelle und einem mit dem Elektromotor gekoppelten Getriebe, wobei ein Abtriebsglied des Getriebes mit einer Steuerwelle eines vollvariablen Ventiltriebs gekoppelt ist. Mechanisch steuerbare, vollvariable Ventiltriebe sind in vielfältigen Ausführungen aus dem Stand der Technik bekannt und dienen der Reduzierung des Kraftstoffbedarfs sowie der Reduktion von Emissionen. Zur Änderung des Ventilhubes wird eine Steuerwelle verwendet. Durch eine Änderung des Ventilhubs in Abhängigkeit der Last der Verbrennungskraftmaschine wird eine Effizienzsteigerung erreicht. The present invention relates to a drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine having an electric motor with a drive shaft and coupled to the electric motor gear, wherein an output member of the transmission is coupled to a control shaft of a fully variable valve train. Mechanically controllable, fully variable valve trains are known in various designs from the prior art and serve the reduction of fuel consumption and the reduction of emissions. To change the valve stroke, a control shaft is used. By changing the valve lift as a function of the load of the internal combustion engine, an increase in efficiency is achieved.
In der EP 3 165 724 Al wird ein vollvariabler Ventiltrieb mit Ein- und Ausgangsventilen beschrieben, die über eine Mimik aktuierbar sind. Die Mimik enthält eine Steuerwelle mit Nocken, die auf den Ventiltrieb wirken, so dass durch Drehung der Steuerwelle der Hub der Ventile sowohl in der Hubhöhe als auch in seiner Phase verstellt werden kann. Die Drehung der Steuerwelle erfolgt über einen elektronischen Aktor, der radial zur Steuerwelle angeordnet ist und aus einem Schneckengetriebe besteht, wobei die Schnecke auf der Ausgangswelle des Elektromotors angeordnet ist und auf ein Zahnrad wirkt, welches auf der Steuerwelle befestigt ist. Nachteilig ist der Bauraumbedarf des radial gelagerten Aktors samt Getriebe, da der Bauraum radial zur Steuerwelle durch weitere Bauteile der Verbrennungskraftmaschine beschränkt ist. Der Erfindung liegt daher die Aufgabe zugrunde, einen Antrieb für die Steuerwelle zu entwickeln, der den aufgezeigten Nachteil des benötigten Bauraumbedarfs in radialer Richtung zur Steuerwelle reduziert und somit den beschränkten Platz im Bereich der Steuerwelle in radialer Richtung einspart In EP 3 165 724 Al a fully variable valve train with input and output valves is described, which can be actuated by a facial expressions. The facial expressions include a control shaft with cams, which act on the valve train, so that by rotation of the control shaft, the stroke of the valves can be adjusted both in the lifting height and in its phase. The rotation of the control shaft via an electronic actuator which is arranged radially to the control shaft and consists of a worm gear, wherein the worm is arranged on the output shaft of the electric motor and acts on a gear which is fixed on the control shaft. A disadvantage is the space requirement of the radially mounted actuator including the transmission, since the space is limited radially to the control shaft by other components of the internal combustion engine. The invention is therefore based on the object to develop a drive for the control shaft, which reduces the indicated disadvantage of the required space requirement in the radial direction to the control shaft and thus saves the limited space in the control shaft in the radial direction
Diese Aufgabe wird durch eine Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebs einerThis object is achieved by a drive device for adjusting a control shaft of a fully variable valve train
Verbrennungskraftmaschine mit den Merkmalen des Hauptanspruchs gelöst. Dadurch, dass die Drehachsen des Getriebes und der Antriebswelle des Elektromotors parallel zur Steuerwelle angeordnet sind, wird radialer Bauraum eingespart, da die Erstreckungsrichtung eines derartigen Aktors vollständig in axialer Richtung anzuordnen ist. Internal combustion engine solved with the features of the main claim. The fact that the axes of rotation of the transmission and the drive shaft of the electric motor are arranged parallel to the control shaft, radial space is saved, since the extension direction of such an actuator is to be arranged completely in the axial direction.
Vorzugsweise ist die Antriebswelle des Elektromotors und die Steuerwelle koaxial zueinander ausgerichtet, so dass zusätzlicher radialer Bauraum eingespart wird und die Lagerung erleichtert wird. Insbesondere sind die Wellen dabei fluchtend zueinander angeordnet. Preferably, the drive shaft of the electric motor and the control shaft is aligned coaxially with each other, so that additional radial space is saved and storage is facilitated. In particular, the waves are arranged in alignment with each other.
In einer vorteilhaften Ausführung wird als Getriebe ein Exzentergetriebe verwendet, da diese Exzentergetriebe eine kompakte Bauweise und eine hohe Untersetzung haben. Des Weiteren weisen diese Getriebe eine hohe Lebensdauer und einen geringen Bauraum auf und es können hohe Untersetzungen in wenigen Getriebestufen realisiert werden. Vorzugsweise ist die Antriebswelle des Elektromotors in axialer Verlängerung der Steuerwelle angeordnet, sodass kein Versatz zwischen der Antriebswelle und der Steuerwelle entsteht, sodass Bauraum eingespart wird und ein direkter Kraftübertrag existiert. In an advantageous embodiment, an eccentric gear is used as the transmission, since these eccentric gear have a compact design and a high reduction ratio. Furthermore, these transmissions have a long service life and a small installation space and high reduction ratios can be realized in a few gear stages. Preferably, the drive shaft of the electric motor is arranged in the axial extension of the control shaft, so that no offset between The drive shaft and the control shaft is created so that space is saved and a direct force transmission exists.
In einer vorteilhaften Ausführung ist das Hohlrad des Getriebes auf einem Ende der Steuerwelle fixiert und dient als Abtriebsglied. Dadurch werden zusätzliche Bauteile gespart, sodass die Montage einfacher ist und Bauraum eingespart wird. In an advantageous embodiment, the ring gear of the transmission is fixed on one end of the control shaft and serves as a driven member. As a result, additional components are saved, so that the installation is easier and space is saved.
Vorzugsweise ist an die Antriebswelle des Elektromotors der Exzenter fixiert oder der Exzenter ist einstückig mit der Antriebswelle ausgebildet, wodurch Bauteile eingespart werden, sodass der Antrieb kostengünstiger ist. Preferably, the eccentric is fixed to the drive shaft of the electric motor or the eccentric is formed integrally with the drive shaft, whereby components are saved, so that the drive is less expensive.
In einer vorteilhaften Ausführung ist die Antriebswelle des Elektromotors in der Steuerwelle gelagert. Dadurch werden Querkräfte durch die Lager der Steuerwelle aufgenommen, so dass auf zusätzliche Lagerstellen zur Lagerung der Antriebswelle verzichtet werden kann, wodurch der Aktor eine kürzere axiale Länge aufweist. Vorteilhaft sind die Planetenräder auf dem Exzenter gelagert, da somit Quer- und Biegekräfte reduziert werden und eine höhere Lebensdauer erreicht wird. In an advantageous embodiment, the drive shaft of the electric motor is mounted in the control shaft. As a result, transverse forces are absorbed by the bearings of the control shaft, so that it is possible to dispense with additional bearing points for mounting the drive shaft, whereby the actuator has a shorter axial length. Advantageously, the planet gears are mounted on the eccentric, since thus transverse and bending forces are reduced and a longer life is achieved.
Bevorzugt ist die Verwendung eines elektronisch kommutierten Innenläufermotors, der einen niedrigen Energieverbrauch bei geringem Verschleiß aufweist. Preferred is the use of an electronically commutated internal rotor motor, which has a low power consumption with low wear.
Die Verwendung des axial angeordneten Antriebs spart insgesamt Bauraum ein. Insbesondere entfällt eine zusätzliche radiale Erstreckung des Aktors, so dass eine gute Zugänglichkeit des Aktors vorhanden ist, ohne dass zusätzlicher radialer Bauraum geschaffen werden muss, der üblicherweise in Verbrennungsmotoren stark beschränkt ist. Zusätzlich werden Bauteile eingespart, was zu einem leichteren Gewicht führt, die Montage erleichtert und Baukosten einspart. Durch die kompakte Bauweise des Getriebes ist eine leckagearme Verwendung möglich. Ein Ausführungsbeispiel einer erfindungsgemäßen Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebs einer Verbrennungskraftmaschine ist in der Figur dargestellt und wird nachfolgend beschrieben. Die Figur 1 zeigt eine Schnittansicht einer erfindungsgemäßen Antriebsvorrichtung zur Drehung einer Steuerwelle. The use of the axially arranged drive saves overall space. In particular, eliminates an additional radial extent of the actuator, so that a good accessibility of the actuator is present without additional radial space must be created, which is usually severely limited in internal combustion engines. additionally components are saved, which leads to a lighter weight, facilitates assembly and saves construction costs. Due to the compact design of the transmission, a low-leakage use is possible. An embodiment of a drive device according to the invention for adjusting a control shaft of a fully variable valve train of an internal combustion engine is shown in the figure and will be described below. FIG. 1 shows a sectional view of a drive device according to the invention for rotating a control shaft.
Die Antriebsvorrichtung weist einen Elektromotor 10 auf, der in einem Motorgehäuse 12 angeordnet ist und als elektronisch kommutierter Innenläufermotor ausgebildet ist. Der Elektromotor besteht aus einem Stator 14 mit Wicklungen 16, welche zur Erzeugung einer Drehbewegung eines Rotors 18 des Elektromotors 10 bestromt werden. Der Rotor ist auf einer Antriebswelle 20 befestigt, deren Ende aus dem Motorgehäuse 12 durch eine Öffnung 15 im Motorgehäuse 12 in einen Raum 13 ragt, der durch einen Ventildeckel 24 eines Verbrennungsmotors verschlossen ist und in dem eine Steuerwelle 22 eines variablen Ventiltriebs angeordnet ist. In eine Ausnehmung am Ende der Steuerwelle 22 ragt das Ende der Antriebswelle 20 und ist dort mittels eines Nadellagers gelagert. Auf der Antriebswelle 20 ist ein Exzenter 27 fixiert oder einstückig mit der Antriebswelle 20 ausgebildet. Der Exzenter 27 trägt ein Nadellager 28, über welches ein erstes Planetenrad 32 und ein zweites Planetenrad 30 gelagert werden, die drehfest zueinander angeordnet sind. Das zweite Planetenrad 30 weist hierzu im radial inneren Bereich einen sich axial in eine innere Öffnung des ersten Planetenrades 32 erstreckenden ringförmigen Fortsatz 34 auf, auf dem das erste Planetenrad 32 aufgepresst oder anderweitig befestigt ist. Das erste Planetenrad 32 kämmt mit einem ersten Hohlrad 36, welches an einer Innenwand des Ventildeckels 24 befestigt ist. Das zweite Planetenrad 30 ist mit einem Abtriebsglied 38 gekoppelt, welches als zweites Hohlrad ausgeführt ist, das fest innerhalb eines sich axial erstreckenden ringförmigen Vorsprungs der Steuerwelle 22 angeordnet ist, der sich von einem plattenförmigem Element erstreckt, das fest auf dem Ende der Steuerwelle 22 angeordnet ist oder einstückig mit dieser ausgebildet ist. Bei einer Drehung der Antriebswelle 20 des Elektromotors 10 wird die Drehbewegung durch den Exzenter 27 auf das erste Planetenrad 32 und das zweite Planetenrad 30 übertragen. Durch das Abrollen des ersten Planetenrades 32 im ersten gehäusefesten und damit stillstehenden Hohlrad 36 erfolgt somit eine zwangsweise Drehung des zweiten Planetenrades 30, welches die Drehbewegung auf das als zweites Hohlrad ausgeführte Abtriebsglied 38 überträgt, das fest mit der Steuerwelle 22 verbunden ist, sodass sich die Steuerwelle 22 dreht. The drive device has an electric motor 10, which is arranged in a motor housing 12 and is designed as an electronically commutated internal rotor motor. The electric motor consists of a stator 14 with windings 16, which are energized to generate a rotational movement of a rotor 18 of the electric motor 10. The rotor is mounted on a drive shaft 20 whose end protrudes from the motor housing 12 through an opening 15 in the motor housing 12 into a space 13 which is closed by a valve cover 24 of an internal combustion engine and in which a control shaft 22 of a variable valve train is arranged. In a recess at the end of the control shaft 22 protrudes the end of the drive shaft 20 and is supported there by means of a needle bearing. On the drive shaft 20, an eccentric 27 is fixed or integrally formed with the drive shaft 20. The eccentric 27 carries a needle bearing 28, via which a first planetary gear 32 and a second planetary gear 30 are mounted, which are arranged rotationally fixed to each other. For this purpose, the second planetary gear 30 has, in the radially inner region, an annular extension 34 extending axially into an inner opening of the first planetary gear 32, on which the first one Planet wheel 32 is pressed or otherwise secured. The first planet gear 32 meshes with a first ring gear 36 which is fixed to an inner wall of the valve cover 24. The second planetary gear 30 is coupled to a driven member 38 which is configured as a second ring gear fixedly disposed within an axially extending annular projection of the control shaft 22 extending from a plate-shaped member fixedly disposed on the end of the control shaft 22 is or is integrally formed with this. Upon rotation of the drive shaft 20 of the electric motor 10, the rotational movement is transmitted through the eccentric 27 to the first planetary gear 32 and the second planetary gear 30. By rolling the first planetary gear 32 in the first housing fixed and thus stationary ring gear 36 thus takes place a forced rotation of the second planetary gear 30, which transmits the rotational movement to the second ring gear designed as output member 38 which is fixedly connected to the control shaft 22 so that the Control shaft 22 rotates.
Durch diese Art des Getriebes werden sehr hohe Untersetzungen erreicht, so dass eine extrem genaue Winkelverstellung der Steuerwelle ermöglicht wird. Durch die kompakte Bauweise der drehfest verbundenen Planetenräder benötigt das Getriebe wenig Bauraum. Durch die parallele Anordnung des Motors zum Getriebe und die Anordnung der Antriebswelle als axiale Verlängerung der Steuerwelle, wird kein Bauraum radial zum Ventiltrieb benötigt, da die Erstreckungsrichtung des Aktors komplett in axialer Richtung ist, wodurch der durch weitere Bauteile der Verbrennungskraftmaschine beschränkte radiale Bauraum eingespart wird. Durch die Lagerung der Antriebswelle innerhalb der Steuerwelle werden Querkräfte auf die Lagerung der Steuerwelle geführt, was zu einer längeren Lebensdauer der erfindungsgemäßen Vorrichtung führt. Es sollte deutlich sein, dass verschiedene konstruktive Modifikationen im Vergleich zu der beschriebenen Ausführungsform möglich sind, ohne den Schutzbereich des Hauptanspruchs zu verlassen. So kann anstatt des Axialspaltmotors ein elektronisch kommutierter Innenläufermotor verwendet werden, welcher parallel zum Getriebe angeordnet ist, wodurch kein Bauraum radial zum Ventiltrieb notwendig ist und der Aktor komplett in axialer Erstreckungsrichtung angeordnet ist. Anstatt des Exzentergetriebes kann ein mindestens zweistufiges Planetengetriebe genutzt werden, wobei ein erstes Sonnenrad an der Antriebswelle fixiert oder einstückig mit dieser gefertigt ist. Durch eine drehfeste Kopplung des ersten Planetenrades mit dem zweiten Planetenrad, wird eine Drehung der Antriebswelle auf das drehfest in der Steuerwelle gelagerte zweite Hohlrad übertragen. By this type of transmission very high reductions are achieved, so that an extremely accurate angle adjustment of the control shaft is made possible. Due to the compact design of rotatably connected planet gears, the transmission requires little space. Due to the parallel arrangement of the engine to the transmission and the arrangement of the drive shaft as an axial extension of the control shaft, no space is required radially to the valve train, since the extension direction of the actuator is completely in the axial direction, whereby the limited by other components of the internal combustion engine radial space is saved , Due to the bearing of the drive shaft within the control shaft, transverse forces are transmitted to the bearing of the control shaft, which leads to a longer service life of the device according to the invention. It should be understood that various structural modifications are possible in comparison to the described embodiment without departing from the scope of the main claim. Thus, instead of the axial gap motor, an electronically commutated internal rotor motor can be used, which is arranged parallel to the transmission, whereby no installation space is necessary radially to the valve train and the actuator is arranged completely in the axial direction of extent. Instead of the eccentric, an at least two-stage planetary gear can be used, wherein a first sun gear is fixed to the drive shaft or made in one piece with this. By a rotationally fixed coupling of the first planetary gear with the second planetary gear, a rotation of the drive shaft is transmitted to the rotatably mounted in the control shaft second ring gear.

Claims

P A T E N T A N S P R Ü C H E 1. Antriebsvorrichtung zur Verstellung einer Steuerwelle (22) eines vollvariablen Ventiltriebs einer Verbrennungskraftmaschine mit einem Elektromotor (10) mit einer Antriebswelle (20) und einem mit dem Elektromotor (10) gekoppelten Getriebe (26), wobei ein Abtriebsglied (38) des Getriebes (26) mit einer Steuerwelle (22) eines vollvariablen Ventiltriebs gekoppelt ist, 1. A drive device for adjusting a control shaft (22) of a fully variable valve train of an internal combustion engine having an electric motor (10) with a drive shaft (20) and a gear (26) coupled to the electric motor (10), wherein an output member (38) the transmission (26) is coupled to a control shaft (22) of a fully variable valve train,
dadurch gekennzeichnet, dass  characterized in that
die Drehachsen des Getriebes (26) und der Antriebswelle (20) des Elektromotors (10) parallel zur Steuerwelle (22) angeordnet sind.  the axes of rotation of the gear (26) and the drive shaft (20) of the electric motor (10) are arranged parallel to the control shaft (22).
2. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach2. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine after
Anspruch 1, Claim 1,
dadurch gekennzeichnet, dass  characterized in that
die Antriebswelle (20) des Elektromotors (10) und die Steuerwelle (22) koaxial zueinander angeordnet sind.  the drive shaft (20) of the electric motor (10) and the control shaft (22) are arranged coaxially with each other.
3. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, 3. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
das Getriebe (26) ein Exzentergetriebe ist.  the transmission (26) is an eccentric gear.
4. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, 4. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of the preceding claims,
dadurch gekennzeichnet, dass die Antriebswelle (20) des Elektromotors (10) in axialer Verlängerung der Steuerwelle (22) angeordnet ist. characterized in that the drive shaft (20) of the electric motor (10) is arranged in the axial extension of the control shaft (22).
5. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, 5. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
als Abtriebsglied (38) ein Hohlrad dient, welches zu einem axialen Ende der Steuerwelle (22) fixiert ist.  as a driven member (38), a ring gear is used, which is fixed to an axial end of the control shaft (22).
6. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der Ansprüche 3 bis 5, 6. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of claims 3 to 5,
dadurch gekennzeichnet, dass  characterized in that
ein Exzenter des Exzentergetriebes (26) auf der Antriebswelle (20) des Elektromotors (10) befestigt ist oder einstückig mit der an eccentric of the eccentric (26) on the drive shaft (20) of the electric motor (10) is fixed or integral with the
Antriebswelle (20) ausgebildet ist. Drive shaft (20) is formed.
7. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, 7. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
die Antriebswelle (20) des Elektromotors (10) in der Steuerwelle (22) gelagert ist.  the drive shaft (20) of the electric motor (10) is mounted in the control shaft (22).
8. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der Ansprüche 3 bis 7, 8. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of claims 3 to 7,
dadurch gekennzeichnet, dass  characterized in that
die Planetenräder (30, 32) des Getriebes (26) auf dem Exzenter (27) gelagert sind. the planet gears (30, 32) of the transmission (26) are mounted on the eccentric (27).
9. Antriebsvorrichtung zur Verstellung einer Steuerwelle eines vollvariablen Ventiltriebes einer Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, 9. Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
der Elektromotor (10) ein elektronisch kommutierter Innenläufermotor ist.  the electric motor (10) is an electronically commutated internal rotor motor.
EP18811782.4A 2017-12-06 2018-11-28 Drive device for adjusting a control shaft of a fully variable valve drive of an internal combustion engine Withdrawn EP3721062A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017129025.7A DE102017129025A1 (en) 2017-12-06 2017-12-06 Drive device for adjusting a control shaft of a fully variable valve train of an internal combustion engine
PCT/EP2018/082846 WO2019110388A1 (en) 2017-12-06 2018-11-28 Drive device for adjusting a control shaft of a fully variable valve drive of an internal combustion engine

Publications (1)

Publication Number Publication Date
EP3721062A1 true EP3721062A1 (en) 2020-10-14

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ID=64564864

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Application Number Title Priority Date Filing Date
EP18811782.4A Withdrawn EP3721062A1 (en) 2017-12-06 2018-11-28 Drive device for adjusting a control shaft of a fully variable valve drive of an internal combustion engine

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EP (1) EP3721062A1 (en)
DE (1) DE102017129025A1 (en)
WO (1) WO2019110388A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10120449A1 (en) * 2001-04-26 2002-10-31 Ina Schaeffler Kg Shaft rotatable by electric motor
DE10211998A1 (en) * 2002-03-18 2003-10-02 Ina Schaeffler Kg Device for controlling the cylinder charge of a spark ignition internal combustion engine
DE102004003327A1 (en) * 2004-01-22 2005-09-29 Entec Consulting Gmbh Variable valve lift device for internal combustion engine, has rotatable eccentric shaft having eccentrics contours positioned within circle formed by external diameter of bearings of eccentric shaft
JP4896817B2 (en) * 2006-07-25 2012-03-14 本田技研工業株式会社 Variable valve operating device for internal combustion engine
JP4952653B2 (en) * 2007-06-04 2012-06-13 株式会社デンソー Valve timing adjustment device
US20100059005A1 (en) * 2008-09-08 2010-03-11 Stone Albert C Method and apparatus for adjusting variable valve lift
DE102010033089A1 (en) * 2010-08-02 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Variable valve drive system of internal combustion engine, has electric motor that is acted upon helical gear for shifting axle into one of positions of actuator mechanism
PL231252B1 (en) * 2014-06-27 2019-02-28 Bydon Slawomir Mechanical gear with two gears combined with each other, the axes of which rotate together in eccentric motion inside the two gears with internal teeth permanently meshed with them
DE102015118884A1 (en) 2015-11-04 2017-05-04 Pierburg Gmbh Mechanically controllable valve train
DE102016205805A1 (en) * 2016-04-07 2017-10-12 Bayerische Motoren Werke Aktiengesellschaft Valve drive and motor assembly

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DE102017129025A1 (en) 2019-06-06

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