EP1485581A1 - Camshaft adjuster for an internal combustion engine - Google Patents

Camshaft adjuster for an internal combustion engine

Info

Publication number
EP1485581A1
EP1485581A1 EP03744333A EP03744333A EP1485581A1 EP 1485581 A1 EP1485581 A1 EP 1485581A1 EP 03744333 A EP03744333 A EP 03744333A EP 03744333 A EP03744333 A EP 03744333A EP 1485581 A1 EP1485581 A1 EP 1485581A1
Authority
EP
European Patent Office
Prior art keywords
guide sleeve
camshaft
control piston
camshaft adjuster
adjuster according
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
EP03744333A
Other languages
German (de)
French (fr)
Other versions
EP1485581B1 (en
Inventor
Christian Haser
Kai Lehmann
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.)
Daimler 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 EP1485581A1 publication Critical patent/EP1485581A1/en
Application granted granted Critical
Publication of EP1485581B1 publication Critical patent/EP1485581B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F01L1/34—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
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • 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
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • F01L2001/3443—Solenoid driven oil control valves
    • 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
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • F01L2001/34433—Location oil control valves

Definitions

  • the invention relates to a camshaft adjuster according to the preamble of claim 1.
  • An actuating unit for angular adjustment of a camshaft can be controlled via the control piston, the actuating unit having an inner body formed by an impeller in a rotationally fixed manner with the camshaft and an outer body rotatably mounted to the camshaft and formed by a sprocket wheel, via which a drive connection from the crankshaft to the camshaft runs.
  • the control piston is slidably guided in a receptacle of a central clamping screw in the axial direction of the central clamping screw.
  • the inner body is axially clamped against the camshaft via the central clamping screw.
  • the invention is based in particular on the object of providing a generic camshaft adjuster for an internal combustion engine with reduced tolerances and at the same time reduced production costs. It is solved according to the invention by the features of claim 1. Further refinements result from the subclaims.
  • the invention relates to a camshaft adjuster for an internal combustion engine with a hydraulic control piston, with which an actuating unit for angular adjustment of a camshaft can be controlled.
  • control piston be guided in a separate guide sleeve.
  • the guide sleeve can be designed specifically for its function and faults caused by other functions can be avoided.
  • Control edges can be introduced to the guide sleeve in a structurally simple, inexpensive and particularly precise manner, as a result of which tolerances can be reduced overall and costs can be saved.
  • Functional decoupling can be achieved and modularization and unification can be achieved with the functional decoupling, e.g. can be used for at least several similar guide sleeves for different internal combustion engines.
  • the guide sleeve is arranged in the camshaft, simple oil guidance can be achieved and, in particular, existing oil guides can be used essentially unchanged. Furthermore, the arrangement of the guide sleeve in the camshaft enables an advantageous precise position assignment of the control piston to the camshaft.
  • the guide sleeve can, however, also be arranged in an impeller, a central tensioning screw or another component which appears useful to the person skilled in the art.
  • the guide sleeve be inserted, as a result of which it can be designed and assembled particularly simply and inexpensively.
  • the guide sleeve could also be screwed on.
  • the guide sleeve can also be held in a component receiving the guide sleeve by various non-positive, positive and / or material connections that appear to be useful to the person skilled in the art, for example by a welded connection, adhesive connection, press connection, screw connection, etc.
  • the guide sleeve pressed in or is the guide sleeve held by a press connection the guide sleeve can be attached inexpensively, and in particular the attachment can advantageously be integrated into existing assembly processes of internal combustion engines.
  • the press connection is particularly advantageously produced by a heat-related shrinking process.
  • At least one channel is introduced at least one interface between the guide sleeve and a component receiving the guide sleeve in the longitudinal and / or in the circumferential direction of the guide sleeve, additional channels which are difficult to manufacture can be avoided in other functional components, such as in particular in the camshaft, and costs can be saved, and in particular if the channel is formed by a recess made in the guide sleeve.
  • a distribution of pressure and / or control means is realized via the channel.
  • control piston be held captively in the guide sleeve by means of a securing element.
  • the guide sleeve and the control piston can advantageously be preassembled as a unit, checked for their function, transported and assembled.
  • a spring acting on the control piston is arranged in the guide sleeve, whereby a simple control of the control piston via an actuator generating tensile or compressive forces alone can be realized.
  • Fig. 1 shows a section of an internal combustion engine 20 of a motor vehicle, not shown, with a camshaft adjuster according to the invention.
  • the camshaft adjuster has a hydraulic control piston 10 with which an actuating unit for angular adjustment of a camshaft 16 can be controlled.
  • the control piston 10 is guided in a separate guide sleeve 11, which has control edges formed by four radial bores 12, 13, 14, 15, the radial bores 12, 15 being arranged offset in the circumferential direction from the radial bores 13, 14.
  • the guide sleeve 11 is inserted or pressed into a concentric recess 21, which extends from one end of the camshaft 16 in the axial direction. Before the guide sleeve 11 is inserted into the recess 21, the camshaft 16 is heated, the camshaft 16 and thus the recess 21 expanding. The guide sleeve 11 is inserted into the recess 21 in the heated state, namely until it strikes the bottom of the recess 21 with its end face facing the camshaft 16. When the cam shaft 16 narrows the recess 21, and the guide sleeve 11 is pressed into the recess 21.
  • the camshaft 16 is mounted in a cylinder head 23 of the internal combustion engine 20 via a main bearing 22 and is fixed in the axial direction to the control piston 10 via a cover 24 screwed onto the cylinder head 23.
  • pressure medium is supplied via a radial bore 25 and via an axial bore 26 in the camshaft 16 and via interfaces 17, 55 between the guide sleeve 11 and the camshaft 16, namely via an axially extending channel, not shown, and via an annular groove 47, radial bores 27, 28 are fed to the guide sleeve 11, via which the pressure medium is guided into an annular space formed by an annular groove 29 of the control piston 10 and by the guide sleeve 11.
  • the channel, not shown, and the annular groove 47 are formed by recesses made in the guide sleeve 11.
  • control piston 10 On a side of the control piston 10 facing the camshaft 16 there is a helical compression spring 19 acting on the control piston 10, which is supported with its end facing away from the control piston 10 on a bottom of the guide sleeve 11 closed to the side of the camshaft 16 and with its end facing the control piston 10 End acts on the control piston 10.
  • an actuating magnet 30 formed by a pressure magnet is arranged in a housing 36 which is fixedly mounted to the cylinder head 23 and by means of which the control piston 10 can be adjusted against the spring force of the helical compression spring 19.
  • piston 10 on an end of the control spring facing away from the helical compression spring 19 piston 10 a contact point, not shown, between the plunger of the pressure magnet and the control piston, which transmits the actuating forces of the pressure magnet to the control piston in a known manner.
  • the control piston 10 is secured in the guide sleeve 11 via a locking ring 18 in the direction facing away from the helical compression spring 19.
  • the actuating unit which can be controlled with the actuating magnet 30 via the control piston 10 has a sleeve-shaped housing 31 which encloses the camshaft 16 at its end.
  • the cover 32, the housing 31 and the sprocket 33 are clamped over tensioning screws 34 extending in the axial direction and form a unit rotatably mounted on the camshaft 16.
  • the cover 32, the housing 31 and the sprocket 33 enclose an annular space in which an impeller 35 is arranged.
  • the impeller 35 is pressed non-rotatably onto the camshaft 16 and has vanes, not shown, which extend outward in the radial direction.
  • the vanes of the impeller 35 form pressure chambers with vanes, not shown, which are molded onto the housing 31 and extend radially inwards. If the actuating magnet 30 is deactivated, the control piston 10 is displaced by the helical compression spring 19 into its first end position facing away from the camshaft 16.
  • the annular groove 29 of the control piston 10 is located radially within the radial bores 12, 15.
  • the annular groove 29 of the control piston 10 comes to lie radially within the radial bores 13, 14.
  • Via the radial bores 13, 14, via an interface 56 between the guide sleeve 11 and the camshaft 16, specifically via an annular groove 53 made on the outer circumference of the guide sleeve 11, via radial bores 39, 40 in the camshaft 16 and via radial bores 51, 52 in the inner ring of the impeller 35 further pressure chambers are pressurized.
  • annular groove 41 of the control piston 10 comes to rest radially inside the radial bores 12, 15, via which the first pressure spaces are relieved of pressure and via channels 42, 43 in the control piston 10, so that the sprocket 33 rotates relative to the camshaft 16 into its second rotational position ,
  • the actuating magnet 30 is deactivated and the control piston 10 by the spring force of the helical compression spring 19 in the
  • the camshaft 16 is shifted away from it, namely until the annular groove 29 of the control piston 10 comes to rest radially within the radial bores 12, 15, the radial bores 37, the radial bores 37, the radial bores 12, 15 and the annular groove 48 introduced into the guide sleeve 11.
  • 38 in the camshaft 16 and via the radial bores 49, 50 in the inner ring of the impeller 35 pressurized the first pressure chambers.
  • annular groove 44 of the control piston 10 comes to rest radially inside the radial bores 13, 14, via which the further pressure spaces are relieved of pressure and via channels 45, 46 in the control piston 10, so that the sprocket 33 rotates relative to the camshaft 16 into its first rotational position ,

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 camshaft adjuster for an internal combustion engine, comprising a hydraulic control piston, which is used to control an adjusting unit for adjusting the angle of a camshaft. The invention is characterised in that the control piston is configured in a separate guide casing.

Description

Nockenwellenversteller für eine Brennkraftmaschine Camshaft adjuster for an internal combustion engine
Die Erfindung betrifft einen Nockenwellenversteller nach dem Oberbegriff des Anspruchs 1.The invention relates to a camshaft adjuster according to the preamble of claim 1.
Aus der DE 198 17 319 AI ist ein gattungsbildender Nockenwellenversteller für eine Brennkraftmaschine mit einem hydraulischen Steuerkolben bekannt. Über den Steuerkolben ist eine Stelleinheit zur Winkelverstellung einer Nockenwelle steuerbar, wobei die Stelleinheit einen mit der Nockenwelle drehfest verbundenen, von einem Flügelrad gebildeten Innenkδrper und einen zur Nockenwelle drehbar gelagerten, von einem Kettenzahnrad gebildeten Außenkörper aufweist, über den eine Antriebsverbindung von der Kurbelwelle zur Nockenwelle verläuft. Der Steuerkolben ist in einer Aufnahme einer Zentralspannschraube in axialer Richtung zur ZentralSpannschraube verschiebbar geführt. Über die ZentralSpannschraube ist der Innenkörper axial gegen die Nockenwelle verspannt.From DE 198 17 319 AI a generic camshaft adjuster for an internal combustion engine with a hydraulic control piston is known. An actuating unit for angular adjustment of a camshaft can be controlled via the control piston, the actuating unit having an inner body formed by an impeller in a rotationally fixed manner with the camshaft and an outer body rotatably mounted to the camshaft and formed by a sprocket wheel, via which a drive connection from the crankshaft to the camshaft runs. The control piston is slidably guided in a receptacle of a central clamping screw in the axial direction of the central clamping screw. The inner body is axially clamped against the camshaft via the central clamping screw.
Der Erfindung liegt insbesondere die Aufgabe zugrunde, einen gattungsgemäßen Nockenwellenversteller für eine Brennkraftmaschine mit reduzierten Toleranzen bei gleichzeitig reduzierten Herstellkosten bereitzustellen. Sie wird gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst. Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen. Die Erfindung geht aus von einem Nockenwellenversteller für eine Brennkraftmaschine mit einem hydraulischen Steuerkolben, mit dem eine Stelleinheit zur Winkelverstellung einer Nockenwelle steuerbar ist.The invention is based in particular on the object of providing a generic camshaft adjuster for an internal combustion engine with reduced tolerances and at the same time reduced production costs. It is solved according to the invention by the features of claim 1. Further refinements result from the subclaims. The invention relates to a camshaft adjuster for an internal combustion engine with a hydraulic control piston, with which an actuating unit for angular adjustment of a camshaft can be controlled.
Es wird vorgeschlagen, daß der Steuerkolben in einer separaten Führungshülse geführt ist. Die Führungshülse kann gezielt auf ihre Funktion ausgelegt und durch andere Funktionen bedingte Störungen können vermieden werden. Steuerkanten können an die Führungshülse konstruktiv einfach, kostengünstig und besonders exakt eingebracht werden, wodurch insgesamt Toleranzen reduziert und Kosten eingespart werden können. Es kann eine Funktionsentkopplung und mit der Funktionsentkopplung kann eine Modularisierung und Vereinheitlichung erreicht werden, z.B. können mehrere zumindest gleichartige Führungshülsen für verschiedene Brennkraftmaschinen verwendet werden.It is proposed that the control piston be guided in a separate guide sleeve. The guide sleeve can be designed specifically for its function and faults caused by other functions can be avoided. Control edges can be introduced to the guide sleeve in a structurally simple, inexpensive and particularly precise manner, as a result of which tolerances can be reduced overall and costs can be saved. Functional decoupling can be achieved and modularization and unification can be achieved with the functional decoupling, e.g. can be used for at least several similar guide sleeves for different internal combustion engines.
Ist die Führungshülse in der Nockenwelle angeordnet, kann eine einfache Ölführung erreicht und insbesondere können bestehende Ölführungen im wesentlichen unverändert genutzt werden. Ferner kann durch die Anordnung der Führungshülse in der Nockenwelle eine vorteilhafte präzise Lagezuordnung des Steuerkolbens zur Nockenwelle erreicht werden. Die Führungshülse kann jedoch auch in einem Flügelrad, einer ZentralSpannschraube oder einem sonstigen, dem Fachmann als sinnvoll erscheinenden Bauteil angeordnet sein.If the guide sleeve is arranged in the camshaft, simple oil guidance can be achieved and, in particular, existing oil guides can be used essentially unchanged. Furthermore, the arrangement of the guide sleeve in the camshaft enables an advantageous precise position assignment of the control piston to the camshaft. The guide sleeve can, however, also be arranged in an impeller, a central tensioning screw or another component which appears useful to the person skilled in the art.
In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß die Führungshülse gesteckt ist, wodurch diese besonders einfach und kostengünstig ausgeführt und montiert werden kann. Grundsätzlich könnte die Führungshülse jedoch auch geschraubt sein. Die Führungshülse kann ferner durch verschiedene, dem Fachmann als sinnvoll erscheinende kraftschlüssige, formschlüssige und/oder stoffschlüssige Verbindungen in einem die Führungshülse aufnehmenden Bauteil gehalten sein, beispielsweise durch eine Schweißverbindung, Klebeverbindung, Preßverbindung, Schraubverbindung usw. Ist die Führungshülse eingepreßt bzw. ist die Führungshülse durch eine Preßverbindung gehalten, kann die Führungshülse kostengünstig befestigt werden, und insbesondere kann die Befestigung vorteilhaft in bestehende Montageprozesse von Brennkraftmaschinen eingebunden werden. Besonders vorteilhaft wird die Preßverbindung durch einen wärmebedingten Schrumpfungsprozeß hergestellt.In a further embodiment of the invention, it is proposed that the guide sleeve be inserted, as a result of which it can be designed and assembled particularly simply and inexpensively. In principle, however, the guide sleeve could also be screwed on. The guide sleeve can also be held in a component receiving the guide sleeve by various non-positive, positive and / or material connections that appear to be useful to the person skilled in the art, for example by a welded connection, adhesive connection, press connection, screw connection, etc. Is the guide sleeve pressed in or is the guide sleeve held by a press connection, the guide sleeve can be attached inexpensively, and in particular the attachment can advantageously be integrated into existing assembly processes of internal combustion engines. The press connection is particularly advantageously produced by a heat-related shrinking process.
Ist an zumindest einer Schnittstelle zwischen der Führungshülse und einem die Führungshülse aufnehmenden Bauteil in Längsund/oder in Umfangsrichtung der Führungshülse zumindest ein Kanal eingebracht, können zusätzliche, aufwendig herzustellende Kanäle in anderen Funktionsbauteilen, wie insbesondere in der Nockenwelle, vermieden und Kosten eingespart werden, und zwar insbesondere wenn der Kanal von einer in die Führungshülse eingebrachten Ausnehmung gebildet ist . Über den Kanal ist eine Verteilung von Druck- und/oder Steuermitteln realisiert.If at least one channel is introduced at least one interface between the guide sleeve and a component receiving the guide sleeve in the longitudinal and / or in the circumferential direction of the guide sleeve, additional channels which are difficult to manufacture can be avoided in other functional components, such as in particular in the camshaft, and costs can be saved, and in particular if the channel is formed by a recess made in the guide sleeve. A distribution of pressure and / or control means is realized via the channel.
In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß der Steuerkolben in der Führungshülse über ein Sicherungselement verliersicher gehalten ist. Die Führungshülse und der Steuerkolben können als Einheit vorteilhaft vormontiert, auf ihre Funktion überprüft, transportiert und montiert werden.In a further embodiment of the invention it is proposed that the control piston be held captively in the guide sleeve by means of a securing element. The guide sleeve and the control piston can advantageously be preassembled as a unit, checked for their function, transported and assembled.
Ferner wird vorgeschlagen, daß in der Führungshülse eine auf den Steuerkolben wirkende Feder angeordnet ist, wodurch eine einfache Ansteuerung des Steuerkolbens über einen allein Zugkräfte oder Druckkräfte erzeugenden Aktuator realisierbar ist.It is also proposed that a spring acting on the control piston is arranged in the guide sleeve, whereby a simple control of the control piston via an actuator generating tensile or compressive forces alone can be realized.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The description and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.
Fig. 1 zeigt einen Ausschnitt einer Brennkraftmaschine 20 eines nicht näher dargestellten Kraftfahrzeugs mit einem erfindungsgemäßen Nockenwellenversteller. Der Nockenwellenversteller besitzt einen hydraulischen Steuerkolben 10, mit dem eine Stelleinheit zur Winkelverstellung einer Nockenwelle 16 steuerbar ist .Fig. 1 shows a section of an internal combustion engine 20 of a motor vehicle, not shown, with a camshaft adjuster according to the invention. The camshaft adjuster has a hydraulic control piston 10 with which an actuating unit for angular adjustment of a camshaft 16 can be controlled.
Der Steuerkolben 10 ist in einer separaten Führungshülse 11 geführt, die von vier Radialbohrungen 12, 13, 14, 15 gebildete Steuerkanten aufweist, wobei die Radialbohrungen 12, 15 in Um- fangsrichtung versetzt zu den Radialbohrungen 13, 14 angeordnet sind.The control piston 10 is guided in a separate guide sleeve 11, which has control edges formed by four radial bores 12, 13, 14, 15, the radial bores 12, 15 being arranged offset in the circumferential direction from the radial bores 13, 14.
Die Führungshülse 11 ist in einer konzentrischen, sich von einem Ende der Nockenwelle 16 in axialer Richtung erstreckenden Ausnehmung 21 eingesteckt bzw. eingepreßt. Bevor die Führungs- hülse 11 in die Ausnehmung 21 eingesteckt wird, wird die Nockenwelle 16 erwärmt, wobei sich die Nockenwelle 16 und damit die Ausnehmung 21 ausdehnt. Die Führungshülse 11 wird im erwärmten Zustand in die Ausnehmung 21 eingesteckt, und zwar bis diese mit ihrer der Nockenwelle 16 zugewandten Stirnseite am Boden der Ausnehmung 21 anschlägt. Beim Abkühlen der Nocken- welle 16 verengt sich die Ausnehmung 21, und die Führungshülse 11 wird in die Ausnehmung 21 eingepreßt.The guide sleeve 11 is inserted or pressed into a concentric recess 21, which extends from one end of the camshaft 16 in the axial direction. Before the guide sleeve 11 is inserted into the recess 21, the camshaft 16 is heated, the camshaft 16 and thus the recess 21 expanding. The guide sleeve 11 is inserted into the recess 21 in the heated state, namely until it strikes the bottom of the recess 21 with its end face facing the camshaft 16. When the cam shaft 16 narrows the recess 21, and the guide sleeve 11 is pressed into the recess 21.
Die Nockenwelle 16 ist über ein Hauptlager 22 in einem Zylinderkopf 23 der Brennkraftmaschine 20 gelagert und ist in axialer Richtung zum Steuerkolben 10 über einen an den Zylinderkopf 23 angeschraubten Deckel 24 fixiert. Ausgehend vom Hauptlager 22 wird Druckmittel über eine Radialbohrung 25 und über eine Axialbohrung 26 in der Nockenwelle 16 sowie über Schnittstellen 17, 55 zwischen der Führungshülse 11 und der Nockenwelle 16, und zwar über einen sich in axialer Richtung erstreckenden, nicht näher dargestellten Kanal und über eine Ringnut 47, Radialbohrungen 27, 28 der Führungshülse 11 zugeführt, ü- ber die das Druckmittel in einen von einer Ringnut 29 des Steuerkolbens 10 und von der Führungshülse 11 gebildeten Ringraum geführt wird. Der nicht näher dargestellte Kanal und die Ringnut 47 werden durch in die Führungshülse 11 eingebrachte Ausnehmungen gebildet .The camshaft 16 is mounted in a cylinder head 23 of the internal combustion engine 20 via a main bearing 22 and is fixed in the axial direction to the control piston 10 via a cover 24 screwed onto the cylinder head 23. Starting from the main bearing 22, pressure medium is supplied via a radial bore 25 and via an axial bore 26 in the camshaft 16 and via interfaces 17, 55 between the guide sleeve 11 and the camshaft 16, namely via an axially extending channel, not shown, and via an annular groove 47, radial bores 27, 28 are fed to the guide sleeve 11, via which the pressure medium is guided into an annular space formed by an annular groove 29 of the control piston 10 and by the guide sleeve 11. The channel, not shown, and the annular groove 47 are formed by recesses made in the guide sleeve 11.
Auf einer der Nockenwelle 16 zugewandten Seite des Steuerkolbens 10 ist eine auf den Steuerkolben 10 wirkende Schraubendruckfeder 19 angeordnet, die sich mit ihrem dem Steuerkolben 10 abgewandten Ende an einem Boden der zur Seite der Nockenwelle 16 verschlossenen Führungshülse 11 abstützt und mit ihrem dem Steuerkolben 10 zugewandten Ende auf den Steuerkolben 10 wirkt.On a side of the control piston 10 facing the camshaft 16 there is a helical compression spring 19 acting on the control piston 10, which is supported with its end facing away from the control piston 10 on a bottom of the guide sleeve 11 closed to the side of the camshaft 16 and with its end facing the control piston 10 End acts on the control piston 10.
Auf der der Nockenwelle 16 abgewandten Seite des Steuerkolbens 10 ist in einem zum Zylinderkopf 23 ortsfest montierten Gehäuse 36 ein von einem Druckmagnet gebildeter Stellmagnet 30 angeordnet, über den der Steuerkolben 10 entgegen der Federkraft der Schraubendruckfeder 19 verstellbar ist. Hierfür ist auf einem der Schraubendruckfeder 19 abgewandten Ende des Steuer- kolbens 10 ein nicht näher dargestellter Kontaktpunkt zwischen dem Stössel des Druckmagneten und dem Steuerkolben vorhanden, der die Stellkräfte des Druckmagneten auf den Steuerkolben in bekannter Weise überträgt. Um die Führungshülse 11 mit der Schraubendruckfeder 19 und dem Steuerkolben 10 unabhängig vom Stellmagneten 30 zu einem Modul vormontieren zu können, ist der Steuerkolben 10 in der Führungshülse 11 über einen Sicherungsring 18 in die von der Schraubendruckfeder 19 abgewandte Richtung gesichert .On the side of the control piston 10 facing away from the camshaft 16, an actuating magnet 30 formed by a pressure magnet is arranged in a housing 36 which is fixedly mounted to the cylinder head 23 and by means of which the control piston 10 can be adjusted against the spring force of the helical compression spring 19. For this purpose, on an end of the control spring facing away from the helical compression spring 19 piston 10 a contact point, not shown, between the plunger of the pressure magnet and the control piston, which transmits the actuating forces of the pressure magnet to the control piston in a known manner. In order to be able to preassemble the guide sleeve 11 with the helical compression spring 19 and the control piston 10 independently of the actuating magnet 30 to form a module, the control piston 10 is secured in the guide sleeve 11 via a locking ring 18 in the direction facing away from the helical compression spring 19.
Die mit dem Stellmagnet 30 über den Steuerkolben 10 steuerbare Stelleinheit besitzt ein die Nockenwelle 16 an ihrem Ende umschließendes, hülsenförmiges Gehäuse 31. Auf der dem Stellmagnet 30 zugewandten Seite des Gehäuses 31 ist ein scheibenförmiger Deckel 32 mit einer zentrischen Ausnehmung für die Führungshülse 11 und auf der dem Stellmagnet 30 abgewandten Seite des Gehäuses 31 ist ein auf der Nockenwelle 16 drehbar gelagertes Kettenzahnrad 33 angeordnet, über das die Nockenwelle 16 mit einer nicht näher dargestellten Kurbelwelle in Antriebsverbindung steht. Der Deckel 32, das Gehäuse 31 und das Kettenzahnrad 33 sind über sich in axialer Richtung erstreckende Spannschrauben 34 verspannt und bilden eine auf der Nockenwelle 16 drehbar gelagerte Einheit.The actuating unit which can be controlled with the actuating magnet 30 via the control piston 10 has a sleeve-shaped housing 31 which encloses the camshaft 16 at its end. On the side of the housing 31 facing the actuating magnet 30 there is a disk-shaped cover 32 with a central recess for the guide sleeve 11 and on the side of the housing 31 facing away from the control magnet 30 there is a sprocket 33 which is rotatably mounted on the camshaft 16 and via which the camshaft 16 is in drive connection with a crankshaft (not shown). The cover 32, the housing 31 and the sprocket 33 are clamped over tensioning screws 34 extending in the axial direction and form a unit rotatably mounted on the camshaft 16.
Der Deckel 32, das Gehäuse 31 und das Kettenzahnrad 33 schließen einen Ringraum ein, in dem ein Flügelrad 35 angeordnet ist. Das Flügelrad 35 ist drehfest auf die Nockenwelle 16 aufgepreßt und besitzt sich in radialer Richtung nach außen erstreckende, nicht näher dargestellte Flügel. Die Flügel des Flügelrads 35 bilden mit nicht näher dargestellten, an das Gehäuse 31 angeformten, sich radial nach innen erstreckenden Flügeln Druckräume . Ist der Stellmagnet 30 deaktiviert, ist der Steuerkolben 10 durch die Schraubendruckfeder 19 in seine erste, der Nockenwelle 16 abgewandte Endstellung verschoben. Die Ringnut 29 des Steuerkolbens 10 befindet sich radial innerhalb der Radialbohrungen 12, 15. Über die Radialbohrungen 12, 15, über eine Schnittstelle 54 zwischen der Führungshülse 11 und der Nockenwelle 16, und zwar über eine am Außenumfang der Führungshülse 11 eingebrachte Ringnut 48 und über Radialbohrungen 37, 38 in der Nockenwelle 16 sowie über Radialbohrungen 49, 50 in einem Innenring des Flügelrads 35 werden erste Druckräume mit Druckmittel beaufschlagt, so daß das Kettenzahnrad 33 relativ zur Nockenwelle 16 in einer ersten Drehstellung fixiert ist.The cover 32, the housing 31 and the sprocket 33 enclose an annular space in which an impeller 35 is arranged. The impeller 35 is pressed non-rotatably onto the camshaft 16 and has vanes, not shown, which extend outward in the radial direction. The vanes of the impeller 35 form pressure chambers with vanes, not shown, which are molded onto the housing 31 and extend radially inwards. If the actuating magnet 30 is deactivated, the control piston 10 is displaced by the helical compression spring 19 into its first end position facing away from the camshaft 16. The annular groove 29 of the control piston 10 is located radially within the radial bores 12, 15. Via the radial bores 12, 15, via an interface 54 between the guide sleeve 11 and the camshaft 16, specifically via an annular groove 48 made on the outer circumference of the guide sleeve 11 and over Radial bores 37, 38 in the camshaft 16 and via radial bores 49, 50 in an inner ring of the impeller 35 are pressurized with pressure medium, so that the sprocket 33 is fixed relative to the camshaft 16 in a first rotational position.
Wird der Stellmagnet 30 aktiviert und der Steuerkolben 10 entgegen der Federkraft der Schraubendruckfeder 19 in Richtung der Nockenwelle 16 in seine zweite, der Nockenwelle 16 zugewandte Endstellung verschoben, kommt die Ringnut 29 des Steuerkolbens 10 radial innerhalb der Radialbohrungen 13, 14 zum Liegen. Über die Radialbohrungen 13, 14, über eine Schnittstelle 56 zwischen der Führungshülse 11 und der Nockenwelle 16, und zwar über eine am Außenumfang der Führungshülse 11 eingebrachte Ringnut 53, über Radialbohrungen 39, 40 in der Nockenwelle 16 und über Radialbohrungen 51, 52 im Innenring des Flügelrads 35 werden dabei weitere Druckräume mit Druckmittel beaufschlagt. Gleichzeitig kommt radial innerhalb der Radialbohrungen 12, 15 eine Ringnut 41 des Steuerkolbens 10 zum Liegen, über die und über Kanäle 42, 43 im Steuerkolben 10 die ersten Druckräume druckentlastet werden, so daß sich das Kettenzahnrad 33 relativ zur Nockenwelle 16 in seine zweite Drehstellung verdreht.If the actuating magnet 30 is activated and the control piston 10 is moved against the spring force of the helical compression spring 19 in the direction of the camshaft 16 into its second end position facing the camshaft 16, the annular groove 29 of the control piston 10 comes to lie radially within the radial bores 13, 14. Via the radial bores 13, 14, via an interface 56 between the guide sleeve 11 and the camshaft 16, specifically via an annular groove 53 made on the outer circumference of the guide sleeve 11, via radial bores 39, 40 in the camshaft 16 and via radial bores 51, 52 in the inner ring of the impeller 35 further pressure chambers are pressurized. At the same time, an annular groove 41 of the control piston 10 comes to rest radially inside the radial bores 12, 15, via which the first pressure spaces are relieved of pressure and via channels 42, 43 in the control piston 10, so that the sprocket 33 rotates relative to the camshaft 16 into its second rotational position ,
Wird der Stellmagnet 30 deaktiviert und der Steuerkolben 10 durch die Federkraft der Schraubendruckfeder 19 in die von der Nockenwelle 16 abgewandte Richtung verschoben, und zwar bis die Ringnut 29 des Steuerkolbens 10 radial innerhalb der Radialbohrungen 12, 15 zum Liegen kommt, werden über die Radial- bohrungen 12, 15, über die in die Führungshülse 11 eingebrachte Ringnut 48, die Radialbohrungen 37, 38 in der Nockenwelle 16 und über die Radialbohrungen 49, 50 im Innenring des Flügelrads 35 die ersten Druckräume mit Druckmittel beaufschlagt. Gleichzeitig kommt radial innerhalb der Radialbohrungen 13, 14 eine Ringnut 44 des Steuerkolbens 10 zum Liegen, über die und über Kanäle 45, 46 im Steuerkolben 10 die weiteren Druckräume druckentlastet werden, so daß sich das Kettenzahnrad 33 relativ zur Nockenwelle 16 in seine erste Drehstellung verdreht. The actuating magnet 30 is deactivated and the control piston 10 by the spring force of the helical compression spring 19 in the The camshaft 16 is shifted away from it, namely until the annular groove 29 of the control piston 10 comes to rest radially within the radial bores 12, 15, the radial bores 37, the radial bores 37, the radial bores 12, 15 and the annular groove 48 introduced into the guide sleeve 11. 38 in the camshaft 16 and via the radial bores 49, 50 in the inner ring of the impeller 35 pressurized the first pressure chambers. At the same time, an annular groove 44 of the control piston 10 comes to rest radially inside the radial bores 13, 14, via which the further pressure spaces are relieved of pressure and via channels 45, 46 in the control piston 10, so that the sprocket 33 rotates relative to the camshaft 16 into its first rotational position ,

Claims

Patentansprüche claims
1. Nockenwellenversteller für eine Brennkraftmaschine mit einem hydraulischen Steuerkolben, mit dem eine Stelleinheit zur Winkelverstellung einer Nockenwelle steuerbar ist, d a d u r c h g e k e n n z e i c h n e t , daß der Steuerkolben (10) in einer separaten Führungshülse (11) geführt ist.1. Camshaft adjuster for an internal combustion engine with a hydraulic control piston, with which an actuating unit for the angular adjustment of a camshaft can be controlled, so that the control piston (10) is guided in a separate guide sleeve (11).
2. Nockenwellenversteller 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 die Führungshülse (11) von Bohrungen (12, 13, 14, 15) und/oder Nuten gebildete Steuerkanten aufweist.2. Camshaft adjuster according to claim 1, that the guide sleeve (11) has bores (12, 13, 14, 15) and / or grooves formed control edges.
3. Nockenwellenversteller 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 die Führungshülse (11) in der Nockenwelle (16) angeordnet ist .3. camshaft adjuster 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 guide sleeve (11) in the camshaft (16) is arranged.
4. Nockenwellenversteller nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Führungshülse (11) gesteckt ist.4. camshaft adjuster according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the guide sleeve (11) is inserted.
5. Nockenwellenversteller nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß die Führungshülse (11) eingepreßt ist.5. camshaft adjuster according to claim 4, characterized in that the guide sleeve (11) is pressed.
6. Nockenwellenversteller nach Anspruch 4 oder 5, d a d u r c h g e k e n n z e i c h n e t , daß an zumindest einer Schnittstelle (17, 54, 55, 56) zwischen der Führungshülse (11) und einem die Führungshülse (11) aufnehmenden Bauteil (16) in Längs- und/oder in Umfangsrichtung der Führungshülse (11) zumindest ein Kanal (47, 48, 53) eingebracht ist .6. Camshaft adjuster according to claim 4 or 5, characterized in that at least one interface (17, 54, 55, 56) between the guide sleeve (11) and a guide sleeve (11) receiving component (16) in longitudinal and / or in At least one channel (47, 48, 53) is introduced in the circumferential direction of the guide sleeve (11).
7. Nockenwellenversteller nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , daß der Steuerkolben (10) in der Führungshülse (11) über ein7. camshaft adjuster according to any one of the preceding claims, that the control piston (10) in the guide sleeve (11) via a
Sicherungselement (18) verliersicher gehalten ist.Securing element (18) is kept captive.
8. Nockenwellenversteller nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t , daß in der Führungshülse (11) eine auf den Steuerkolben (10) wirkende Feder (19) angeordnet ist.8. camshaft adjuster according to claim 7, d a d u r c h g e k e n z e i c h n e t that in the guide sleeve (11) on the control piston (10) acting spring (19) is arranged.
9. Nockenwellenversteller nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t , daß die Lage des Steuerkolbens (10) durch das Kräftegleichgewicht zwischen der Feder (19) und der entgegenwirkenden Magnetkraft bestimmt wird. 9. camshaft adjuster according to claim 8, that the position of the control piston (10) is determined by the balance of forces between the spring (19) and the opposing magnetic force.
EP03744333A 2002-03-15 2003-02-21 Camshaft adjuster for an internal combustion engine Expired - Fee Related EP1485581B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10211468 2002-03-15
DE10211468A DE10211468A1 (en) 2002-03-15 2002-03-15 Camshaft adjuster for internal combustion engine has control piston in separate guide casing
PCT/EP2003/001772 WO2003078804A1 (en) 2002-03-15 2003-02-21 Camshaft adjuster for an internal combustion engine

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EP1485581A1 true EP1485581A1 (en) 2004-12-15
EP1485581B1 EP1485581B1 (en) 2006-04-12

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US (1) US20050051123A1 (en)
EP (1) EP1485581B1 (en)
JP (1) JP2005530078A (en)
DE (2) DE10211468A1 (en)
WO (1) WO2003078804A1 (en)

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JP2005530078A (en) 2005-10-06
EP1485581B1 (en) 2006-04-12
WO2003078804A1 (en) 2003-09-25
DE10211468A1 (en) 2003-09-25
US20050051123A1 (en) 2005-03-10

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