EP0500622A1 - Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine. - Google Patents

Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine.

Info

Publication number
EP0500622A1
EP0500622A1 EP90916254A EP90916254A EP0500622A1 EP 0500622 A1 EP0500622 A1 EP 0500622A1 EP 90916254 A EP90916254 A EP 90916254A EP 90916254 A EP90916254 A EP 90916254A EP 0500622 A1 EP0500622 A1 EP 0500622A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
combustion engine
internal combustion
toothing
drive wheel
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
EP90916254A
Other languages
German (de)
French (fr)
Other versions
EP0500622B1 (en
Inventor
Wilhelm Hannibal
Johannes Steinwart
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Publication of EP0500622A1 publication Critical patent/EP0500622A1/en
Application granted granted Critical
Publication of EP0500622B1 publication Critical patent/EP0500622B1/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
    • F01L1/34403—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft
    • 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
    • F01L1/34403—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft
    • F01L1/34406—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft the helically teethed sleeve being located in the camshaft driving pulley
    • 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
    • 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
    • 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 drive device for a camshaft mounted in the cylinder head of an internal combustion engine according to the preamble of claim 1.
  • the invention has for its object to provide a drive device of the generic type with which the problems described when installing the internal combustion engine in a motor vehicle are avoided.
  • the servomotor is arranged adjacent to the end of the camshaft facing away from the drive wheel and in that the actuator of the servomotor is connected to the switching element by a switching rod which passes through the camshaft.
  • the servomotor can be accommodated without any problems since it sits at a point at which the bonnet rises towards the windshield.
  • the drive wheel and the camshaft are preferably mounted independently of one another in the cylinder head, which results in a much simpler construction than in the prior art.
  • the two external toothings of the switching element are arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner.
  • Fig. 1 shows a partial longitudinal section of a cylinder head of an internal combustion engine in a horizontal plane through a camshaft
  • FIG. 2 is a view of the assembly comprising the switching element, the shift rod and the actuator of the servomotor.
  • Fig. 1, 1 designates the cylinder head of a valve-controlled reciprocating internal combustion engine, in which a camshaft 3 is supported via bearings 2 and carries cams 4 with which intake and / or exhaust valves (not shown) of the internal combustion engine are actuated.
  • a drive wheel 5 is mounted in the cylinder head 1, which is driven by the crankshaft of the internal combustion engine.
  • a switching element 6 is used, which has two axially adjacent external toothings 7 and 8, which include different angles with the longitudinal center axis of the camshaft 3.
  • the external toothing 7 is designed as a straight toothing and the external toothing 8 as a helical toothing.
  • the external toothing 8 could also be designed as a straight toothing and the external toothing 7 as a helical toothing.
  • the external toothing 7 engages in a corresponding internal toothing 9 in the hollow hub 10 of the drive wheel 5 and the external toothing 8 engages in a corresponding internal toothing 11 in a longitudinal bore 12 of the camshaft 3.
  • the switching element 6 can be axially displaced by a servomotor 13.
  • the servomotor is arranged on the end of the camshaft 3 facing away from the drive wheel 5 and, in the exemplary embodiment, has a hydraulic cylinder 14 which is connected in a rotationally fixed manner to the camshaft 3 by its cover 20 and with its hub 22 in a bearing 15 coaxial with the camshaft bearings 2 is stored. " In the cylinder 14, a piston 16 is slidably arranged, from which a shift rod 17 extends, which is connected to the control element 6. A spring 18 in the cover 20 strives to move to its in FIG. 1, left end position to the piston 16 ⁇ . The piston 16 forms a hydraulic chamber 19 with the cylinder 14.
  • a sleeve 21 is seated in the hub 22, in which a valve body 23 is slidably arranged with two longitudinal grooves 24 and 25, of which the first longitudinal groove 24 has an opening 28 in the sleeve 21 communicates with the hydraulic chamber 19 and the second longitudinal groove 25 is open to the interior of the cylinder head 1.
  • the valve body 23 is under the action of a spring 26, which strives to hold the valve body 23 in the position shown, in which the first longitudinal groove 24 via a channel . 27 in the hub 22 and in the sleeve 21 is connected to the bearing 15 so that the hydraulic chamber 19 is supplied with pressure oil from the bearing 15 and the piston 16 is moved against the action of the spring 18 into the right end position shown.
  • the valve body 23 can be moved to the right by an electromagnet 28 against the action of the spring 26.
  • the first longitudinal groove 24 is controlled by the channel 27 and the second longitudinal groove 25 through a further opening 29 in the sleeve 21 with the hydraulic chamber 19 in connection. This can reduce the pressure in the hydraulic chamber 19 and the spring 18 can move the piston 16 to the left. This causes a corresponding displacement of the actuating element 6, the camshaft 3 being rotated relative to the drive wheel 5 due to the helical teeth 8, 11
  • the drive wheel or its hub 10 is mounted in the cylinder head 1 independently of the camshaft 3.
  • the external toothings 7 and 8 of the switching element 6 can be arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner by a cardan joint 30 indicated schematically in FIG. 2.
  • the servomotor 13 is shown in the exemplary embodiment as a hydraulic motor, the actuator (piston 16) of which is displaced in one direction by the spring 18 and in the other direction by oil pressure.
  • the actuator rod 16
  • the actuator is moved in both directions by oil pressure.
  • the arrangement of the servomotor 13 on the end of the camshaft 3 facing away from the drive wheel saves the otherwise required space for accommodating the servomotor in front of the drive wheel 5.
  • the problems in accommodating the internal combustion engine in the engine compartment of a motor vehicle are thereby considerably reduced.

Landscapes

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

Abstract

Un dispositif d'entraînement pour un arbre à cames (3) d'un moteur à combustion interne est pourvu d'un système de rotation de l'arbre à cames (3) relativement à un pignon d'entraînement (5) coaxial, présentant un élément de commande pignon (6) qui coopère avec le pignon d'entraînement (5) par l'intermédiaire d'une denture droite (7) et avec l'arbre à cames par l'intermédiaire d'une denture hélicoïdale (8) et qui peut être déplacé axialement par un servomoteur (13). Le servomoteur (13) est situé à l'extrémité de l'arbre à cames (3) opposée au pignon d'entraînement (5). On évite ainsi que la longueur axiale du moteur à combustion interne se prolonge au-delà du pignon d'entraînement (5) à cause du servomoteur.A drive device for a camshaft (3) of an internal combustion engine is provided with a camshaft rotation system (3) relative to a coaxial drive pinion (5), having a pinion control element (6) which cooperates with the drive pinion (5) via a straight toothing (7) and with the camshaft via a helical toothing (8) and which can be moved axially by a servomotor (13). The actuator (13) is located at the end of the camshaft (3) opposite the drive pinion (5). This prevents the axial length of the internal combustion engine from extending beyond the drive pinion (5) due to the servomotor.

Description

ANTRIEBSVORRICHTUNG FÜR EINE IM ZYLINDERKOPF EINER BRENNKRAFTMASCHINE GELAGERTE NOCKENWELLE DRIVING DEVICE FOR A CAMSHAFT BEARED IN THE CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
Die Erfindung bezieht sich auf eine Antriebsvorrichtung für eine im Zylinderkopf einer Brennkraftmaschine gelagerte Nockenwelle entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a drive device for a camshaft mounted in the cylinder head of an internal combustion engine according to the preamble of claim 1.
Bei einer bekannten Antriebsvorrichtung dieser Art (DE-A 36 16 234) ist der Stellmotor axial vor dem Antriebsrad in einem Maschinengehäusedeckel angeordnet. Durch diese An¬ ordnung vergrößert sich die Abmessung der Brennkraft¬ maschine in Längsrichtung. Dies führt bei einem Längsein¬ bau der Brennkraftmaschine in ein Kraftfahrzeug zu Platz¬ problemen, da aus aerodynamischen Gründen ein flacher, nach vorn abfallender Motorraumdeckel erwünscht ist. Es ist daher kaum möglich, eine derartige Brennkraftmaschine mit variab¬ ler Ventilsteuerung in ein bestehendes Fahrzeug einzubauen.In a known drive device of this type (DE-A 36 16 234), the servomotor is arranged axially in front of the drive wheel in a machine housing cover. As a result of this arrangement, the dimension of the internal combustion engine increases in the longitudinal direction. When the internal combustion engine is installed longitudinally in a motor vehicle, this leads to space problems since, for aerodynamic reasons, a flat engine compartment cover sloping forward is desired. It is therefore hardly possible to install such an internal combustion engine with variable valve control in an existing vehicle.
Der Erfindung liegt die Aufgabe zugrunde, eine Antriebsvor¬ richtung der gattungsgemäßen Art zu schaffen, mit welcher die geschilderten Probleme beim Einbau der Brennkraft¬ maschine in ein Kraftfahrzeug vermieden sind.The invention has for its object to provide a drive device of the generic type with which the problems described when installing the internal combustion engine in a motor vehicle are avoided.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Stellmotor dem vom Antriebsrad abgewandten Ende der Nocken¬ welle benachbart angeordnet ist und daß das Stellglied des Stellmotors mit dem Schaltelement durch eine die Nocken¬ welle durchsetzende Schaltstange verbunden ist.This object is achieved according to the invention in that the servomotor is arranged adjacent to the end of the camshaft facing away from the drive wheel and in that the actuator of the servomotor is connected to the switching element by a switching rod which passes through the camshaft.
Bei dem erfindungsgemäßen Vorschlag kann der Stellmotor problemlos untergebracht werden, da er an einer Stelle sitzt, an welcher die Motorraumhaube zur Windschutzscheibe hin ansteigt. Vorzugsweise sind das Antriebsrad und die Nockenwelle .un¬ abhängig voneinander im Zylinderkopf gelagert, wodurch sich gegenüber dem Stand der Technik ein wesentlich einfacherer Aufbau ergibt. Um dabei Fluchtungsfehler zwischen dem An¬ triebsrad und der Nockenwelle ausgleichen zu können, sind die beiden Außenverzahnungen des Schaltelements auf ge¬ sonderten Abschnitten angeordnet, die drehfest, jedoch winkelbeweglich miteinander verbunden sind.In the proposal according to the invention, the servomotor can be accommodated without any problems since it sits at a point at which the bonnet rises towards the windshield. The drive wheel and the camshaft are preferably mounted independently of one another in the cylinder head, which results in a much simpler construction than in the prior art. In order to be able to compensate for misalignments between the drive wheel and the camshaft, the two external toothings of the switching element are arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner.
Ein Ausführungsbeispiel der Erfindung wird im folgenden unter Bezugnahme auf die Zeichnungen beschrieben. Es zeigt:An embodiment of the invention is described below with reference to the drawings. It shows:
Fig. 1 einen Teil-Längsschnitt eines Zylinderkopfes einer Brennkraf maschine in einer waagrechten, durch eine Nockenwelle gelegten Ebene, undFig. 1 shows a partial longitudinal section of a cylinder head of an internal combustion engine in a horizontal plane through a camshaft, and
Fig. 2 eine Ansicht der das Schaltelement, die Schalt¬ stange und das Stellglied des Stellmotors umfassen¬ den Baugruppe.2 is a view of the assembly comprising the switching element, the shift rod and the actuator of the servomotor.
In Fig. 1 ist mit 1 der Zylinderkopf einer ventilgesteuer¬ ten Hubkolben-Brennkraftmaschine bezeichnet, in dem über Lager 2 eine Nockenwelle 3 gelagert ist, die Nocken 4 trägt, mit denen nicht gezeigte Einlaß- und/oder Auslaßventile der Brennkraftmaschine betätigt werden. Koaxial zu der Nocken¬ welle 3 ist im Zylinderkopf 1 ein Antriebsrad 5 gelagert, das von der Kurbelwelle der Brennkraftmaschine angetrieben wird. Zur Übertragung des Antriebs vom Antriebsrad 5 auf die Nockenwelle 3 dient ein Schaltelement 6, das zwei axial nebeneinander liegende Außenverzahnungen 7 und 8 aufweist, die unterschiedliche Winkel mit der Längsmittelachse der Nockenwelle 3 einschließen. Im Ausführungsbeispiel ist die Außenverzahnung 7 als Geradverzahnung und die Außenverzah¬ nung 8 als Schrägverzahnung ausgebildet. Es könnte jedoch auch die Außenverzahnung 8 als Geradverzahnung und die Außenverzahnung 7 als Schrägverzahnung ausgebildet sein. Schließlich besteht auch die Möglichkeit, sowohl die Δußen- verzahnung 7 als auch die Außenverzahnung 8 als Schrägver¬ zahnung, jedoch mit entgegengesetzter oder unterschiedlicher Schrägstellung, auszuführen. Die Außenverzahnung 7 greift in eine entsprechende Innenverzahnung 9 in der hohlen Nabe 10 des Antriebsrades 5 ein und die Außenverzahnung 8 greift in eine entsprechende Innenverzahnung 11 in einer Längsbohrung 12 der Nockenwelle 3 ein. Das Schaltelement 6 kann durch einen Stellmotor 13 axial verschoben werden. Der Stellmotor ist an dem von dem Antriebsrad 5 abgewandten Ende der Nockenwelle 3 angeordnet und weist im Ausführungsbeispiel einen Hydraulikzylinder 14 auf, der durch seinen Deckel 20 drehfest mit der Nockenwelle 3 verbunden ist und mit seiner Nabe 22 in einem mit den Nockenwellenlagern 2 koaxialen Lager 15 gelagert ist. „Im Zylinder 14 ist verschiebbar ein Kolben 16 angeordnet, von dem eine Schaltstange 17 ausgeht, die mit dem Stellelement 6 verbunden ist. Eine Feder 18 im Deckel 20 ist bestrebt, den Kolben 16 in seine in Fig. 1 linke Endstellung zu^bewegen. Der Kolben 16 bildet mit dem Zylinder 14 eine Hydraulikkammer 19. In der Nabe 22 sitzt eine Hülse 21, in der verschiebbar ein Ventilkörper 23 mit zwei Längsnuten 24 und 25 angeordnet ist, von denen die erste Längsnut 24 über eine Öffnung 28 in der Hülse 21 mit der Hydraulikkammer 19 in Verbindung steht und die zweite Längsnut 25 zum Inneren des Zylinderkopfes 1 hin offen ist. Der Ventilkörper 23 steht unter der Wirkung einer Feder 26, die bestrebt ist, den Ventilkörper 23 in der dargestellten Stellung zu halten, in welcher die erste Längsnut 24 über einen Kanal.27 in der Nabe 22 und in der Hülse 21 mit dem Lager 15 in Verbindung steht, so daß der Hydraulikkammer 19 Drucköl aus dem Lager 15 zugeführt wird und der Kolben 16 entgegen der Wirkung der Feder 18 in die dargestellte rechte Endlage verschoben wird. Der Ventilkörper 23 kann durch einen Elektromagneten 28 entgegen der Wirkung der Feder 26 nach rechts verschoben werden. In dieser Stellung ist die erste Längsnut 24 von dem Kanal 27 abgesteuert und die zweite Längsnut 25 durch eine weitere Öffnung 29 in der Hülse 21 mit der Hydraulikkammer 19 in Verbindung. Dadurch kann sich der Druck in der Hydraulikkammer 19 abbauen und die Feder 18 kann den Kolben 16 nach links verschieben. Dies bewirkt eine entsprechende Verschiebung des Stellelements 6, wobei aufgrund der Schrägverzahnung 8, 11 eine Verdrehung der Nockenwelle 3 relativ zum Antriebsrad 5 stattfindetIn Fig. 1, 1 designates the cylinder head of a valve-controlled reciprocating internal combustion engine, in which a camshaft 3 is supported via bearings 2 and carries cams 4 with which intake and / or exhaust valves (not shown) of the internal combustion engine are actuated. Coaxially to the Nocken¬ shaft 3, a drive wheel 5 is mounted in the cylinder head 1, which is driven by the crankshaft of the internal combustion engine. To transfer the drive from the drive wheel 5 to the camshaft 3, a switching element 6 is used, which has two axially adjacent external toothings 7 and 8, which include different angles with the longitudinal center axis of the camshaft 3. In the exemplary embodiment, the external toothing 7 is designed as a straight toothing and the external toothing 8 as a helical toothing. However, the external toothing 8 could also be designed as a straight toothing and the external toothing 7 as a helical toothing. Finally, there is also the possibility of designing both the external toothing 7 and the external toothing 8 as helical teeth, but with opposite or different oblique positions. The external toothing 7 engages in a corresponding internal toothing 9 in the hollow hub 10 of the drive wheel 5 and the external toothing 8 engages in a corresponding internal toothing 11 in a longitudinal bore 12 of the camshaft 3. The switching element 6 can be axially displaced by a servomotor 13. The servomotor is arranged on the end of the camshaft 3 facing away from the drive wheel 5 and, in the exemplary embodiment, has a hydraulic cylinder 14 which is connected in a rotationally fixed manner to the camshaft 3 by its cover 20 and with its hub 22 in a bearing 15 coaxial with the camshaft bearings 2 is stored. " In the cylinder 14, a piston 16 is slidably arranged, from which a shift rod 17 extends, which is connected to the control element 6. A spring 18 in the cover 20 strives to move to its in FIG. 1, left end position to the piston 16 ^. The piston 16 forms a hydraulic chamber 19 with the cylinder 14. A sleeve 21 is seated in the hub 22, in which a valve body 23 is slidably arranged with two longitudinal grooves 24 and 25, of which the first longitudinal groove 24 has an opening 28 in the sleeve 21 communicates with the hydraulic chamber 19 and the second longitudinal groove 25 is open to the interior of the cylinder head 1. The valve body 23 is under the action of a spring 26, which strives to hold the valve body 23 in the position shown, in which the first longitudinal groove 24 via a channel . 27 in the hub 22 and in the sleeve 21 is connected to the bearing 15 so that the hydraulic chamber 19 is supplied with pressure oil from the bearing 15 and the piston 16 is moved against the action of the spring 18 into the right end position shown. The valve body 23 can be moved to the right by an electromagnet 28 against the action of the spring 26. In this position, the first longitudinal groove 24 is controlled by the channel 27 and the second longitudinal groove 25 through a further opening 29 in the sleeve 21 with the hydraulic chamber 19 in connection. This can reduce the pressure in the hydraulic chamber 19 and the spring 18 can move the piston 16 to the left. This causes a corresponding displacement of the actuating element 6, the camshaft 3 being rotated relative to the drive wheel 5 due to the helical teeth 8, 11
Wie ersichtlich, ist das Antriebsrad bzw. dessen Nabe 10 un¬ abhängig von der Nockenwelle 3 im Zylinderkopf 1 gelagert. Um Fluchtungsfehler zwischen der Nabe 10 und der Nockenwelle 3 auszugleichen, können die Außenverzahnungen 7 und 8 des Schaltelements 6 auf gesonderten Abschnitten angeordnet sein, die durch ein in Fig. 2 schematisch angedeutetes Kardangelenk 30 drehfest, jedoch winkelbeweglich miteinander verbunden sind.As can be seen, the drive wheel or its hub 10 is mounted in the cylinder head 1 independently of the camshaft 3. In order to compensate for misalignment between the hub 10 and the camshaft 3, the external toothings 7 and 8 of the switching element 6 can be arranged on separate sections which are connected to one another in a rotationally fixed but angularly movable manner by a cardan joint 30 indicated schematically in FIG. 2.
Der Stellmotor 13 ist im Ausführungsbeispiel als Hydraulik¬ motor dargestellt, dessen Stellglied (Kolben 16) in der einen Richtung durch die Feder 18 und in der anderen Richtung durch Öldruck verschoben wird. Anstelle dieses einfach wirkenden Hydraulikmotors kann jedoch auch ein doppelt wirkender Hydraulikmotor entsprechend dem Stand der Technik vorgesehen sein, bei welchem das Stellglied in beiden Richtungen durch Öldruck bewegt wird.The servomotor 13 is shown in the exemplary embodiment as a hydraulic motor, the actuator (piston 16) of which is displaced in one direction by the spring 18 and in the other direction by oil pressure. Instead of this single-acting hydraulic motor, however, a double-acting hydraulic motor according to the prior art can also be provided, in which the actuator is moved in both directions by oil pressure.
Durch die Anordnung des Stellmotors 13 an dem vom Antriebs¬ rad abgewandten Ende der Nockenwelle 3 wird der sonst er¬ forderliche Platz für die Unterbringung des Stellmotors vor dem Antriebsrad 5 eingespart. Dadurch werden die Probleme bei der Unterbringung der Brennkraftmaschine im Motorraum eines Kraftfahrzeuges erheblich verringert. The arrangement of the servomotor 13 on the end of the camshaft 3 facing away from the drive wheel saves the otherwise required space for accommodating the servomotor in front of the drive wheel 5. The problems in accommodating the internal combustion engine in the engine compartment of a motor vehicle are thereby considerably reduced.

Claims

P a t e n t a n s p r ü c h e P a t e n t a n s r u c h e
Antriebεvorrichtung für eine im Zylinderkopf (1) einer Brennkraftmaschine gelagerte Nockenwelle (3) mit einer Einrichtung zum Verdrehen der Nockenwelle relativ zu einem koaxialen, mit der Kurbelwelle der Brennkraftmaεchine in Antriebsverbindung stehenden Antriebsrad (5), die ein koaxial zur Nockenwelle (3) angeordnetes, durch einen Stellmotor (13) axial zwischen zwei Endεtellungen ver¬ schiebbares Schaltelement (6) aufweist, das über eine erste Verzahnung (7,9) mit dem Antriebsrad (5) und über eine zweite Verzahnung (8, 11) mit der Nockenwelle (3) zu¬ sammenwirkt, wobei jede Verzahnung aus einer am Schalt- eiement (6) vorgesehenen Außenverzahnung (7 bzw. 8) und einer in der Nabe (10) des Antriebsrades (5) bzw. in der Nockenwelle (3) vorgesehenen Innenverzahnung (9 bzw. 11) besteht und die beiden Verzahnungen unterschiedliche Winkel mit der Längsmittelachse der Nockenwelle ein¬ schließen, d a d u r c h g e k e n n z e i c h n e t , daß der Stellmotor (13) dem vom Antriebsrad (5) abge¬ wandten Ende der Nockenwelle (3) benachbart angeordnet ist und daß das Stellglied (16) des Stellmotors (13) mit dem Schaltelement (6) durch eine die Nockenwelle (3) durch¬ setzende Schaltstange (17) verbunden ist.Drive device for a camshaft (3) mounted in the cylinder head (1) of an internal combustion engine, with a device for rotating the camshaft relative to a coaxial drive wheel (5) which is in drive connection with the crankshaft of the internal combustion engine and which has a coaxial to the camshaft (3), has a switching element (6) which can be displaced axially between two end positions by means of a servomotor (13) and which has a first toothing (7, 9) with the drive wheel (5) and a second toothing (8, 11) with the camshaft (3 ) interacts, each toothing consisting of an external toothing (7 or 8) provided on the switching element (6) and an internal toothing (9) provided in the hub (10) of the drive wheel (5) or in the camshaft (3) or 11) and the two toothings include different angles with the longitudinal central axis of the camshaft, characterized in that the servomotor (13) is connected to the drive wheel d (5) opposite end of the camshaft (3) is arranged adjacent and that the actuator (16) of the servomotor (13) is connected to the switching element (6) by means of a switching rod (17) which penetrates the camshaft (3) .
Antriebsvorrichtung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß das Antriebsrad (5) und die Nockenwelle (3) unabhängig voneinander im Zylinderkopf (1) gelagert sind und daß die beiden Außenverzahnungen (7, 8) des Schalt¬ elements (6) auf gesonderten Abschnitten angeordnet sind, die drehfest, jedoch winkelbeweglich miteinander verbunden sind. Drive device according to claim 1, characterized gekenn¬ characterized in that the drive wheel (5) and the camshaft (3) are mounted independently of each other in the cylinder head (1) and that the two external toothings (7, 8) of the switching element (6) on separate Sections are arranged which are non-rotatably, but connected to each other at an angle.
EP90916254A 1989-11-11 1990-10-26 Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine Expired - Lifetime EP0500622B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3937628A DE3937628A1 (en) 1989-11-11 1989-11-11 DRIVE DEVICE FOR A CAMSHAFT BEARED IN THE CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
DE3937628 1989-11-11

Publications (2)

Publication Number Publication Date
EP0500622A1 true EP0500622A1 (en) 1992-09-02
EP0500622B1 EP0500622B1 (en) 1993-06-09

Family

ID=6393378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90916254A Expired - Lifetime EP0500622B1 (en) 1989-11-11 1990-10-26 Drive arrangement for a camshaft fitted in the cylinder head of an internal combustion engine

Country Status (4)

Country Link
US (1) US5211141A (en)
EP (1) EP0500622B1 (en)
DE (2) DE3937628A1 (en)
WO (1) WO1991007574A1 (en)

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Also Published As

Publication number Publication date
DE3937628A1 (en) 1991-05-16
US5211141A (en) 1993-05-18
DE59001730D1 (en) 1993-07-15
EP0500622B1 (en) 1993-06-09
WO1991007574A1 (en) 1991-05-30

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