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EP1088154A1 - Device for adjusting the relative angle of a cam shaft - Google Patents

Device for adjusting the relative angle of a cam shaft

Info

Publication number
EP1088154A1
EP1088154A1 EP00909182A EP00909182A EP1088154A1 EP 1088154 A1 EP1088154 A1 EP 1088154A1 EP 00909182 A EP00909182 A EP 00909182A EP 00909182 A EP00909182 A EP 00909182A EP 1088154 A1 EP1088154 A1 EP 1088154A1
Authority
EP
European Patent Office
Prior art keywords
impeller
pocket
recess
wing
drive element
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
EP00909182A
Other languages
German (de)
French (fr)
Other versions
EP1088154B1 (en
Inventor
Anton Huber
Wolfgang Speier
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
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1088154A1 publication Critical patent/EP1088154A1/en
Application granted granted Critical
Publication of EP1088154B1 publication Critical patent/EP1088154B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
    • F01L2001/34483—Phaser return springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2102—Adjustable

Definitions

  • the invention relates to a device for the relative angular adjustment of a camshaft according to the kind defined in the preamble of claim 1.
  • a generic device is known from DE 197 26 300 AI.
  • a spring element is arranged between the impeller and the housing wheel, which holds the impeller in a basic position. As a result, the impeller cannot move even when the oil pressure is not present and it is ensured that no more noise occurs when the internal combustion engine is started and that the desired valve timing is also set for the exhaust valve.
  • the housing wheel and the impeller each have recesses in which the spring element is arranged in order to ensure a certain guidance for the same.
  • the recess in the housing wheel due to the wrestle depth of the recess is only insufficient guidance for the spring element and on the other hand, it is extremely expensive to manufacture, the recess in the housing wheel. If the depth of the recess were increased for the guidance of the spring element, these manufacturing difficulties would increase.
  • EP 0 821 138 AI The general prior art relating to devices for the relative angle adjustment of camshafts is further referred to EP 0 821 138 AI, EP 0 801 212 AI, DE 39 07 077 C2, DE 41 08 111 AI, DE 44 02 586 AI , the DE 196 30 403 AI and DE 196 54 926 AI referred.
  • the housing wheel can be produced inexpensively by sintering, which makes a great deal of machining unnecessary. Furthermore, the spring elements can also be easily inserted into the cavity between the impeller and the Housing wheel 'are mounted.
  • Figure 1 shows a device according to the invention in section along the line I-I of Fig. 2.
  • FIG. 2 shows the device according to the invention in section along the line II-II from FIG. 1st
  • the camshaft is provided for actuating exhaust valves, likewise not shown, of an internal combustion engine operating in a known manner, but the device 1 in the form described below can also be used for use with an intake camshaft.
  • the device 1 has a drive element 2, which in this case is designed as a so-called housing wheel 2.
  • the housing wheel 2 is provided on its periphery with a toothing 3, designed in one piece with the housing wheel 2, for a chain (not shown).
  • an impeller 4 which forms the output element and which is not shown with the camshaft in FIG. asked, but connected in a manner known per se.
  • the housing wheel 2 has four inwardly projecting projections 5, a different number of projections 5 being conceivable in other embodiments.
  • the impeller 4 is provided with four outwardly projecting vanes 6, which are each located in recesses or cavities 7 of the housing wheel 2 formed between the individual projections 5. Here, however, the wings 6 do not fill the recesses 7. The impeller 4 can thus perform a slight rotation within the housing wheel 2, which corresponds to the difference between the length of the recesses 7 and the length of the blades 6, each viewed in the U direction.
  • a spring element 8 is arranged between the projections 5 and the wings 6.
  • the spring elements 8 press the vanes 6 to the edge of the projections 5 and thus hold the impeller 4 in its basic position, in which the camshaft realizes "normal" valve timing.
  • the camshaft and thus the impeller 4 always strives to move away from the projections 5, which would result in an adjustment of the valve timing in the direction of a late opening of the exhaust valves.
  • the wings 6 also have pocket-like recesses 10.
  • the spring elements 8, which in this case are designed as compression springs, are thus located in the cavities 7 between the projections 5 and the wings 6.
  • the recesses 10 have a smaller depth than the recesses 9.
  • spring elements 8 can also be provided in a manner not shown.
  • spring elements 8 it is also possible to use spring elements 8 with a different spring characteristic.
  • the pocket-like recesses 9 of the projections 5 are opened in the axial direction in order to make the recesses 9 easier to manufacture and the spring elements 8 to be assembled more easily. In this way, an inexpensive sintering of the housing wheel 2 is possible.
  • the pocket-like recesses 10 can also be opened in the axial direction, as a result of which gives the possibility of also producing the impeller 4 by sintering.
  • a locking device 11 is provided on the housing wheel 2 and on the impeller 4, by means of which the impeller 4 can be locked in its basic position. Since the locking device 11 is of a type known per se, it will not be discussed in more detail below.
  • a so-called central screw 12 is arranged inside the impeller 4 in a manner known per se.
  • a control piston 13 of a likewise known type.
  • the central screw 12 and the control piston 13 together form a 4/2 proportional valve as a control device.
  • various ring channels 14, which are located in the impeller 4 are released and through inlet openings 15 in the impeller 4 or in the central screw 12, oil causes the adjustment of the impeller 4 relative to the Housing wheel 2 in a manner known per se.
  • the existing oil of the internal combustion engine can be used to operate the device 1, i.e. the device 1 can be integrated into the oil circuit of the internal combustion engine.
  • the impeller 4 there are further bores 17, which are shown in dashed lines and emerge from the impeller 4 directly behind the edge on which the vanes 6 rest on the projections 5. If oil is passed through the bores 17, the impeller 4 moves against the force of the spring elements 8 into a different position, as a result of which the camshaft is rotated accordingly and a different valve timing is set.
  • the impeller 4 is adjusted until the correct valve timing is determined by a sensor, not shown. Then the corresponding ring channels 14 and thus the bores 16 and 17 are closed. Medium enclosed in the cavities 7 holds the impeller 4 in the set position. This is a continuous adjustment with an integrated 4/2 proportional valve as stated above. Alternatively, an embodiment without an integrated valve but with an external valve would also be possible.
  • the device 1 has covers 18 and 19 on both sides in the axial direction, which are connected to one another by screws 20.
  • the covers 18 and 19 limit the space in which an oil pressure can be applied.

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 device (1) for adjusting the relative angle of a cam shaft, especially for a cam shaft that actuates outlet valves, vis-à-vis a crankshaft that drives said cam shaft. The inventive device is characterized by the following features: A drive element (2) that is driven by the crankshaft, a power take-off element (4) that drives said cam shaft and that can be adjusted vis-à-vis the drive element, and control means for adjusting the drive element vis-à-vis the power take-off element. Said power take-off element (4) is mounted in an at least substantially coaxial relation to the drive element. At least one spring element (8) that holds the drive element in a normal position is arranged between the drive element and the power take-off element.

Description

Vorrichtung zur relativen Winkelverstellung einer Nockenwelle Device for the relative angular adjustment of a camshaft
Die Erfindung betrifft eine Vorrichtung zur relativen Winkelverstellung einer Nockenwelle nach der im Oberbegriff von Anspruch 1 näher definierten Art.The invention relates to a device for the relative angular adjustment of a camshaft according to the kind defined in the preamble of claim 1.
Eine gattungsgemäße Vorrichtung ist aus der DE 197 26 300 AI bekannt. Dabei ist zwischen dem Flügelrad und dem Gehäuserad ein Federelement angeordnet, welches das Flügelrad in einer Grundstellung hält. Dadurch kann sich das Flügelrad auch ohne anliegenden Öldruck nicht bewegen und es ist sichergestellt, daß beim Starten der Brennkraftmaschine keine Geräusche mehr auftreten und die erwünschten Ventilsteuerzeiten auch für das Auslaßventil eingestellt sind.A generic device is known from DE 197 26 300 AI. A spring element is arranged between the impeller and the housing wheel, which holds the impeller in a basic position. As a result, the impeller cannot move even when the oil pressure is not present and it is ensured that no more noise occurs when the internal combustion engine is started and that the desired valve timing is also set for the exhaust valve.
Das Gehäuserad und das Flügelrad weisen hierbei jeweils Ausnehmungen auf, in denen das Federelement angeordnet ist, um eine gewisse Führung für dasselbe zu' gewährleisten. Zum einen ist jedoch aufgrund der ge- ringen Tiefe der Ausnehmung nur eine unzureichende Führung für das Federelement gegeben und zum anderen ist es fertigungstechnisch äußerst aufwendig, die Ausnehmung in dem Gehäuserad herzustellen. Bei einer für die Führung des Federelements günstigen Vergrößerung der Tiefe der Ausnehmung würden sich diese Schwierigkeiten bezüglich der Fertigung noch erhöhen.The housing wheel and the impeller each have recesses in which the spring element is arranged in order to ensure a certain guidance for the same. On the one hand, however, due to the wrestle depth of the recess is only insufficient guidance for the spring element and on the other hand, it is extremely expensive to manufacture, the recess in the housing wheel. If the depth of the recess were increased for the guidance of the spring element, these manufacturing difficulties would increase.
Zum allgemeinen Stand der Technik bezüglich Vorrichtungen zur relativen Winkelverstellung von Nockenwellen wird des weiteren auf die EP 0 821 138 AI, die EP 0 801 212 AI, die DE 39 07 077 C2, die DE 41 08 111 AI, die DE 44 02 586 AI, die DE 196 30 403 AI und die DE 196 54 926 AI verwiesen.The general prior art relating to devices for the relative angle adjustment of camshafts is further referred to EP 0 821 138 AI, EP 0 801 212 AI, DE 39 07 077 C2, DE 41 08 111 AI, DE 44 02 586 AI , the DE 196 30 403 AI and DE 196 54 926 AI referred.
Es ist Aufgabe der vorliegenden Erfindung, eine Vorrichtung zur relativen Winkelverstellung einer Nockenwelle gegenüber der diese antreibenden Kurbelwelle zu schaffen, welche die Vorteile bezüglich des Einnehmens der Grundstellung beibehält, dabei jedoch einfach und mit geringem maschinellen Aufwand herzustellen ist.It is an object of the present invention to provide a device for the relative angular adjustment of a camshaft relative to the crankshaft which drives it, which retains the advantages with regard to assuming the basic position, but is easy to manufacture and requires little mechanical effort.
Erfindungsgemäß wird diese Aufgabe durch die in kennzeichnenden Teil von Anspruch 1 genannten Merkmale gelöst .According to the invention this object is achieved by the features mentioned in the characterizing part of claim 1.
Dadurch, daß erfindungsgemäß die taschenartige Ausnehmung des wenigstens einen Vorsprungs in axialer Richtung geöffnet ist, kann das Gehäuserad kostengünstig durch Sintern hergestellt werden, was einen großen Aufwand an spanender Nachbearbeitung unnötig macht Des weiteren können auch die Fedεrelemente leicht in den Hohlraum zwischen dem Flügelrad und dem Gehäuserad ' montiert werden. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und aus dem nachfolgend anhand der Zeichnung prinzipmäßig dargestellten Ausführungsbeispiel.Because the pocket-like recess of the at least one projection is opened in the axial direction according to the invention, the housing wheel can be produced inexpensively by sintering, which makes a great deal of machining unnecessary. Furthermore, the spring elements can also be easily inserted into the cavity between the impeller and the Housing wheel 'are mounted. Advantageous refinements and developments of the invention result from the subclaims and from the exemplary embodiment shown in principle below with reference to the drawing.
Es zeigt:It shows:
Fig. 1 eine erfindungsgemäße Vorrichtung im Schnitt nach der Linie I-I aus Fig. 2; undFigure 1 shows a device according to the invention in section along the line I-I of Fig. 2. and
Fig. 2 die erfindungsgemäße Vorrichtung im Schnitt nach der Linie II-II aus Fig. 1.2 shows the device according to the invention in section along the line II-II from FIG. 1st
Fig. 1 zeigt eine Vorrichtung 1 zur relativen Winkelverstellung einer nicht dargestellten Nockenwelle gegenüber der diese antreibenden Kurbelwelle, welche ebenfalls nicht dargestellt ist. Im vorliegenden Fall ist die Nockenwelle zur Betätigung von ebenfalls nicht dargestellten Auslaßventilen einer in bekannter Weise arbeitenden Brennkraftmaschine vorgesehen, die Vorrichtung 1 ist jedoch in der nachfolgend beschriebenen Form auch für den Einsatz bei einer Einlaßnockenwelle verwendbar.1 shows a device 1 for the relative angular adjustment of a camshaft, not shown, relative to the crankshaft driving it, which is also not shown. In the present case, the camshaft is provided for actuating exhaust valves, likewise not shown, of an internal combustion engine operating in a known manner, but the device 1 in the form described below can also be used for use with an intake camshaft.
Die Vorrichtung 1 weist ein Antriebselement 2 auf, welches in diesem Fall als sogenanntes Gehäuserad 2 ausgebildet ist. Zur Verbindung mit der Kurbelwelle ist das Gehäuserad 2 an seinem Umfang mit einer einteilig mit dem Gehäuserad 2 ausgebildeten, doppelt ausgeführten Verzahnung 3 für eine nicht dargestellte Kette versehen. Im Inneren des hohlen Gehäuserades 2 befindet sich ein Flügelrad 4, welches das Abtriebs-" element bildet und mit der Nockenwelle in nicht darge- stellter, jedoch an sich bekannter Art und Weise verbunden ist.The device 1 has a drive element 2, which in this case is designed as a so-called housing wheel 2. For connection to the crankshaft, the housing wheel 2 is provided on its periphery with a toothing 3, designed in one piece with the housing wheel 2, for a chain (not shown). In the interior of the hollow housing wheel 2 there is an impeller 4 which forms the output element and which is not shown with the camshaft in FIG. asked, but connected in a manner known per se.
Das Gehäuserad 2 weist vier nach innen ragende Vorsprünge 5 auf, wobei in anderen Ausführungsformen auch eine andere Anzahl von Vorsprüngen 5 denkbar wäre. Das Flügelrad 4 ist mit vier nach außen ragenden Flügeln 6 versehen, welche sich jeweils in zwischen den einzelnen Vorsprüngen 5 gebildeten Aussparungen bzw. Hohlräumen 7 des Gehäuserades 2 befinden. Hierbei füllen die Flügel 6 die Aussparungen 7 jedoch nicht aus. Das Flügelrad 4 kann somit eine geringfügige Drehung innerhalb des Gehäuserades 2 ausführen, welche der Differenz zwischen der Länge der Aussparungen 7 und der Länge der Flügel 6, jeweils in U fangsrichtung betrachtet, entspricht.The housing wheel 2 has four inwardly projecting projections 5, a different number of projections 5 being conceivable in other embodiments. The impeller 4 is provided with four outwardly projecting vanes 6, which are each located in recesses or cavities 7 of the housing wheel 2 formed between the individual projections 5. Here, however, the wings 6 do not fill the recesses 7. The impeller 4 can thus perform a slight rotation within the housing wheel 2, which corresponds to the difference between the length of the recesses 7 and the length of the blades 6, each viewed in the U direction.
Um ein Anliegen der Flügel 6 an den Vorsprüngen 5 zu erreichen, ist zwischen den Vorsprüngen 5 und den Flügeln 6 jeweils ein Federelement 8 angeordnet. Die Federelemente 8 drücken die Flügel 6 an den Rand der Vorsprünge 5 und halten somit das Flügelrad 4 in seiner Grundstellung, in welcher die Nockenwelle "normale" Ventilsteuerzeiten realisiert. Durch Momente, welche infolge von Reibung auftreten, ist die Nokkenwelle und somit das Flügelrad 4 nämlich stets bestrebt, sich von den Vorsprüngen 5 weg zu bewegen, was eine Verstellung der Ventilsteuerzeit in Richtung eines späten Öff ens der Auslaßventile zur Folge hätte. Insbesondere in der Startphase der Brennkraftmaschine ist es jedoch unerläßlich, daß sich das Flügelrad 4 in seiner Grundstellung befindet.In order to make the wings 6 rest against the projections 5, a spring element 8 is arranged between the projections 5 and the wings 6. The spring elements 8 press the vanes 6 to the edge of the projections 5 and thus hold the impeller 4 in its basic position, in which the camshaft realizes "normal" valve timing. By moments, which occur as a result of friction, the camshaft and thus the impeller 4 always strives to move away from the projections 5, which would result in an adjustment of the valve timing in the direction of a late opening of the exhaust valves. Particularly in the starting phase of the internal combustion engine, however, it is essential that the impeller 4 is in its basic position.
Eine sichere Führung der Federelemente 8 wird dadurch gewährleistet, daß sich in den Vorsprüngen 5 taschenartige Ausnehmungen 9 befinden, in welche jeweils die Federelemente 8 eingeführt sind. Zur Aufnahme der Federelemente 8 weisen auch die Flügel 6 taschenartige Ausnehmungen 10 auf. Die Federelemente 8, welche in diesem Fall als Druckfedern ausgebildet sind, befinden sich somit in den Hohlräumen 7 zwischen den Vorsprüngen 5 und den Flügeln 6. Die Ausnehmungen 10 weisen in diesem Fall eine geringere Tiefe auf als die Ausnehmungen 9.This ensures secure guidance of the spring elements 8 ensures that there are 5 pocket-like recesses 9 in the projections, into each of which the spring elements 8 are inserted. To accommodate the spring elements 8, the wings 6 also have pocket-like recesses 10. The spring elements 8, which in this case are designed as compression springs, are thus located in the cavities 7 between the projections 5 and the wings 6. In this case, the recesses 10 have a smaller depth than the recesses 9.
Um unterschiedliche Rückstellkräfte bzw. Rückstellmomente für das Flügelrad 4 realisieren zu können, kann in nicht dargestellter Art und Weise auch eine geringere oder größere Anzahl an Federelementen 8 vorgesehen sein. Hierzu ist es einerseits möglich, in einzelne der bestehenden Hohlräume 7 keine Federelemente 8 einzusetzen oder eine andere Anzahl von Vorsprüngen 5 des Gehäuserades 2 und der zugehörigen Flügel 6 des Flügelrades 4 vorzusehen. Dies stellt eine sehr einfache und kostengünstige Anpassung an verschiedene Rückstellmomente verschiedener Brennkraftmaschinen dar, an welchen die Vorrichtung 1 eingesetzt werden kann. Alternativ ist es auch möglich, Federelemente 8 mit einer anderen Federkennlinie einzusetzen.In order to be able to implement different restoring forces or restoring moments for the impeller 4, a smaller or larger number of spring elements 8 can also be provided in a manner not shown. For this purpose, it is possible on the one hand not to insert spring elements 8 into individual existing cavities 7 or to provide a different number of projections 5 of the housing wheel 2 and the associated vanes 6 of the impeller 4. This represents a very simple and inexpensive adaptation to different restoring torques of different internal combustion engines, on which the device 1 can be used. Alternatively, it is also possible to use spring elements 8 with a different spring characteristic.
Wie in Fig. 2 besser erkennbar ist, sind die taschenartigen Ausnehmungen 9 der Vorsprünge 5 in axialer Richtung geöffnet, um eine einfachere Fertigung der Ausnehmungen 9 und eine einfachere Montage der Federelemente 8 zu ermöglichen. Auf diese Art und Weise ist nämlich ein kostengünstiges Sintern des Gehäuserades 2 möglich. Auch die taschenartigen Ausnehmungen 10 können in axialer Richtung geöffnet sein, wodurch sich die Möglichkeit ergibt, das Flügelrad 4 ebenfalls durch Sintern herzustellen. Selbstverständlich ist auch die Herstellung der Ausnehmungen 10 in dem Flügelrad 4 durch Bohren möglich. In diesem Fall würde es sich dann um geschlossene Ausnehmungen 10 handeln.As can be seen more clearly in FIG. 2, the pocket-like recesses 9 of the projections 5 are opened in the axial direction in order to make the recesses 9 easier to manufacture and the spring elements 8 to be assembled more easily. In this way, an inexpensive sintering of the housing wheel 2 is possible. The pocket-like recesses 10 can also be opened in the axial direction, as a result of which gives the possibility of also producing the impeller 4 by sintering. Of course, it is also possible to produce the recesses 10 in the impeller 4 by drilling. In this case, the recesses 10 would then be closed.
Aus Fig. 2 geht des weiteren hervor, daß an dem Gehäuserad 2 und an dem Flügelrad 4 eine Verriegelungseinrichtung 11 vorgesehen ist, durch welche das Flügelrad 4 in seiner Grundstellung verriegelt werden kann. Da die Verriegelungseinrichtung 11 von an sich bekannter Bauart ist, wird im folgenden nicht näher auf dieselbe eingegangen .From Fig. 2 it can further be seen that a locking device 11 is provided on the housing wheel 2 and on the impeller 4, by means of which the impeller 4 can be locked in its basic position. Since the locking device 11 is of a type known per se, it will not be discussed in more detail below.
Innerhalb des Flügelrades 4 ist in ebenfalls an sich bekannter Weise eine sogenannte Zentralschraube 12 angeordnet. Innerhalb der Zentralschraube 12 befindet sich ein Steuerkolben 13 von ebenfalls bekannter Bauart. Die Zentralschraube 12 und der Steuerkolben 13 bilden gemeinsam ein 4/2-Proportionalventil als Steuereinrichtung. Durch Verstellung des Steuerkolbens 13 in der Zentralschraube 12 in axialer Richtung werden verschiedene Ringkanäle 14, welche sich in dem Flügelrad 4 befinden, freigegeben und durch Einführöffnungen 15 in das Flügelrad 4 bzw. in die Zentralschraube 12 eintretendes Öl bewirkt die Verstellung des Flügelrades 4 gegenüber dem Gehäuserad 2 in an sich bekannter Weise. Zum Betrieb der Vorrichtung 1 kann das vorhandene Öl der Brennkraftmaschine verwendet werden, d.h. die Vorrichtung 1 kann in den Ölkreislauf der Brennkraftmaschine eingebunden sein.A so-called central screw 12 is arranged inside the impeller 4 in a manner known per se. Within the central screw 12 there is a control piston 13 of a likewise known type. The central screw 12 and the control piston 13 together form a 4/2 proportional valve as a control device. By adjusting the control piston 13 in the central screw 12 in the axial direction, various ring channels 14, which are located in the impeller 4, are released and through inlet openings 15 in the impeller 4 or in the central screw 12, oil causes the adjustment of the impeller 4 relative to the Housing wheel 2 in a manner known per se. The existing oil of the internal combustion engine can be used to operate the device 1, i.e. the device 1 can be integrated into the oil circuit of the internal combustion engine.
Die genaue Art und Weise der Verstellung des Flügelrades 4 ist wiederum in Fig. 1 besser erkennbar. So sind in dem Flügelrad 4 Bohrungen 16 vorgesehen, welche im Bereich zwischen den Flügeln 6 und den Vorsprüngen 5 in die Hohlräume 7 münden. Wenn Öl aus den Ringkanälen 14 in die Bohrungen 16 geleitet wird, bewegt sich das Flügelrad 4 durch den Öldruck in Richtung seiner Grundstellung, also der Anlage der Flügel 6 an den Vorsprüngen 5. In der ' Grundstellung kann das Flügelrad 4 durch die Verriegelungseinrichtung 11 verriegelt werden, z.B. wenn die Brennkraftmaschine abgestellt wird. Das Öffnen der Verriegelungseinrichtung 11 kann wiederum durch Öldruck nach dem Starten der Brennkraf maschine erfolgen. Wie oben beschrieben wird durch die Federelemente 8 das Flügelrad 4 auch dann in die Grundstellung gebracht, wenn kein Öldruck ansteht.The exact manner of the adjustment of the impeller 4 can again be seen better in FIG. 1. So are 4 bores 16 are provided in the impeller, which open into the cavities 7 in the area between the vanes 6 and the projections 5. When oil is passed from the ring channels 14 into the bores 16, the impeller 4 moves by the oil pressure in the direction of its basic position, that is to say the contact of the blades 6 with the projections 5. In the ' basic position, the impeller 4 can be locked by the locking device 11 be, for example, when the internal combustion engine is turned off. The opening of the locking device 11 can in turn be done by oil pressure after starting the internal combustion engine. As described above, the impeller 4 is also brought into the basic position by the spring elements 8 when no oil pressure is present.
In dem Flügelrad 4 befinden sich weitere Bohrungen 17, welche gestrichelt dargestellt sind und direkt hinter derjenigen Kante aus dem Flügelrad 4 austreten, an welcher die Flügel 6 an den Vorsprüngen 5 anliegen. Wird Öl durch die Bohrungen 17 geleitet, so bewegt sich das Flügelrad 4 gegen die Kraft der Federelemente 8 in eine andere Position, wodurch die Nockenwelle entsprechend verdreht und eine andere Ventilsteuerzeit eingestellt wird.In the impeller 4 there are further bores 17, which are shown in dashed lines and emerge from the impeller 4 directly behind the edge on which the vanes 6 rest on the projections 5. If oil is passed through the bores 17, the impeller 4 moves against the force of the spring elements 8 into a different position, as a result of which the camshaft is rotated accordingly and a different valve timing is set.
Die Verstellung des Flügelrades 4 erfolgt so lange, bis von einem nicht dargestellten Sensor die korrekt eingestellte Ventilsteuerzeit festgestellt wird. Daraufhin werden die entsprechenden Ringkanäle 14 und damit die Bohrungen 16 und 17 verschlossen. In den Hohlräumen 7 eingeschlossenes Medium hält das Flügelrad 4 in der eingestellten Stellung. Es handelt sich hierbei um eine kontinuierliche Verstellung mit, wie oben angegeben, integriertem 4/2-Proportionalventil . Es wäre alternativ auch eine Ausführungsform ohne integriertes sondern mit einem externen Ventil möglich.The impeller 4 is adjusted until the correct valve timing is determined by a sensor, not shown. Then the corresponding ring channels 14 and thus the bores 16 and 17 are closed. Medium enclosed in the cavities 7 holds the impeller 4 in the set position. This is a continuous adjustment with an integrated 4/2 proportional valve as stated above. Alternatively, an embodiment without an integrated valve but with an external valve would also be possible.
Die Vorrichtung 1 weist in axialer Richtung an beiden Seiten Deckel 18 und 19 auf, welche durch Schrauben 20 miteinander verbunden sind. Die Deckel 18 und 19 begrenzen hierbei denjenigen Raum, in welchem ein Öldruck aufgebracht werden kann. The device 1 has covers 18 and 19 on both sides in the axial direction, which are connected to one another by screws 20. The covers 18 and 19 limit the space in which an oil pressure can be applied.

Claims

PatentansprücheVorrichtung zur relativen Winkelverstellung einer Nockenwelle, insbesondere einer zur Betätigung von Auslaßventilen vorgesehenen Nockenwelle, gegenüber der diese antreibenden Kurbelwelle mit folgenden Merkmalen: Device for the relative angular adjustment of a camshaft, in particular a camshaft provided for actuating exhaust valves, with respect to the crankshaft which drives it, having the following features:
1.1 einem von der Kurbelwelle angetriebenen Antriebselement,1.1 a drive element driven by the crankshaft,
1.2 einem gegenüber dem Antriebselement verstellbaren Abtriebselement, welches zum Antrieb der Nockenwelle vorgesehen ist,1.2 an output element which is adjustable relative to the drive element and which is provided for driving the camshaft,
1.3 einer Steuereinrichtung zur Verstellung des Antriebselements gegenüber dem Abtriebselement,1.3 a control device for adjusting the drive element relative to the output element,
1.4 das Abtriebselement ist wenigstens annähernd konzentrisch zu dem Antriebselement angeordnet,1.4 the output element is arranged at least approximately concentrically with the drive element,
1.5 zwischen dem Antriebselement und dem Abtriebselement ist wenigstens ein Federelement zum Halten des Abtriebselements in einer Grundstellung angeordnet,1.5 at least one spring element for holding the output element in a basic position is arranged between the drive element and the output element,
1.6 das Abtriebselement ist als Flügelrad mit wenigstens einem Flügel ausgebildet und innerhalb des hohlen und als Gehäuserad ausge- bildeten Antriebselements angeordnet,1.6 the output element is designed as an impeller with at least one wing and inside the hollow and as a housing wheel formed drive elements arranged,
1.7 das Gehäuserad weist wenigstens einen nach innen ragenden Vorsprung auf, an welchem der wenigstens eine Flügel des Flügelrades in der Grundstellung des Flügelrades anliegt,1.7 the housing wheel has at least one inwardly projecting projection on which the at least one wing of the impeller bears in the basic position of the impeller,
1.8 zwischen dem wenigstens einen Flügel und dem wenigstens einen Vorsprung ist ein Hohlraum ausgebildet, in welchem das wenigstens eine Federelement angeordnet ist,1.8 a cavity is formed between the at least one wing and the at least one projection, in which the at least one spring element is arranged,
1.9 der wenigstens eine Vorsprung des Gehäuserades weist eine taschenartige Ausnehmung auf,1.9 the at least one projection of the housing wheel has a pocket-like recess,
1.10 das Federelement ist in der taschenartigen Ausnehmung des wenigstens einen Vorsprungs angeordnet, da dur ch g e ke nn z e i chne t , daß1.10 the spring element is arranged in the pocket-like recess of the at least one projection, as a result of that
1.11 die taschenartige Ausnehmung (9) des wenigstens einen Vorsprungs (5) in axialer Richtung geöffnet ist.1.11 the pocket-like recess (9) of the at least one projection (5) is open in the axial direction.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der wenigstens eine Flügel (6) des Flügelrades (4) eine taschenartige Ausnehmung (10) aufweist.2. Apparatus according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the at least one wing (6) of the impeller (4) has a pocket-like recess (10).
3. Vorrichtung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß das Federelement (8) in der taschenartigen Ausnehmung (10) des wenigstens einen Flügels (6) angeordnet ist.3. Apparatus according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the spring element (8) in the pocket-like recess (10) of the at least one wing (6) is arranged.
Δ Vorrichtung nach einem der Ansprüche 1, 2 oder 3, dadu r ch g e ke nn z e i ch n e t , daß das Federelement (8) als Druckfeder ausgebildet ist . Δ Device according to one of claims 1, 2 or 3, so that the spring element (8) is designed as a compression spring.
5. Vorrichtung nach einem der Ansprüche 2, 3 oder 4, d a d u r c h g e k e n n z e i c h n e t , daß die taschenartige Ausnehmung (10) des wenigstens einen Flügels (6) in axialer Richtung geöffnet ist .5. Device according to one of claims 2, 3 or 4, that the pocket-like recess (10) of the at least one wing (6) is open in the axial direction.
6. Vorrichtung nach einem der Ansprüche 2, 3 oder 4, d a d u r c h g e k e n n z e i c h n e t , daß die taschenartige Ausnehmung (10) des wenigstens einen Flügels (6) in axialer Richtung geschlossen ist .6. Device according to one of claims 2, 3 or 4, that the pocket-like recess (10) of the at least one wing (6) is closed in the axial direction.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, d a d u r c h g e k e n n z e i c h n e t , daß das Flügelrad (4) mehrere Flügel (6) aufweist, welche in der Grundstellung des Flügelrades (4) an einer entsprechenden Anzahl von Vorsprüngen (5) des Gehäuserades (2) anliegen, wobei je nach erforderlicher Rückstellkraft eine entsprechende Anzahl von Federelementen (8) zwischen den Vorsprüngen (5) und den Flügeln (6) vorgesehen sind. 7. Device according to one of claims 1 to 6, characterized in that the impeller (4) has a plurality of vanes (6) which rest in the basic position of the impeller (4) on a corresponding number of projections (5) of the housing wheel (2) Depending on the required restoring force, a corresponding number of spring elements (8) are provided between the projections (5) and the wings (6).
EP00909182A 1999-04-14 2000-02-16 Device for adjusting the relative angle of a cam shaft Expired - Lifetime EP1088154B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19916675 1999-04-14
DE19916675A DE19916675B4 (en) 1999-04-14 1999-04-14 Device for relative angular adjustment of a camshaft
PCT/EP2000/001252 WO2000061920A1 (en) 1999-04-14 2000-02-16 Device for adjusting the relative angle of a cam shaft

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EP1088154A1 true EP1088154A1 (en) 2001-04-04
EP1088154B1 EP1088154B1 (en) 2004-04-07

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EP (1) EP1088154B1 (en)
JP (1) JP2002541380A (en)
DE (2) DE19916675B4 (en)
WO (1) WO2000061920A1 (en)

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Publication number Publication date
WO2000061920A1 (en) 2000-10-19
US6336433B1 (en) 2002-01-08
DE50005967D1 (en) 2004-05-13
DE19916675B4 (en) 2005-07-07
DE19916675A1 (en) 2000-11-30
JP2002541380A (en) 2002-12-03
EP1088154B1 (en) 2004-04-07

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