EP0903470B1 - Dispositif pour varier le calage d'un arbre à cames de moteur à combustion interne - Google Patents

Dispositif pour varier le calage d'un arbre à cames de moteur à combustion interne Download PDF

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Publication number
EP0903470B1
EP0903470B1 EP98890261A EP98890261A EP0903470B1 EP 0903470 B1 EP0903470 B1 EP 0903470B1 EP 98890261 A EP98890261 A EP 98890261A EP 98890261 A EP98890261 A EP 98890261A EP 0903470 B1 EP0903470 B1 EP 0903470B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
electric motor
threaded section
adjusting element
motor
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.)
Expired - Lifetime
Application number
EP98890261A
Other languages
German (de)
English (en)
Other versions
EP0903470A1 (fr
Inventor
Siegfried Ing. Heer
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.)
TCG Unitech AG
Original Assignee
TCG Unitech 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 TCG Unitech AG filed Critical TCG Unitech AG
Priority to AT98890261T priority Critical patent/ATE249573T1/de
Publication of EP0903470A1 publication Critical patent/EP0903470A1/fr
Application granted granted Critical
Publication of EP0903470B1 publication Critical patent/EP0903470B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L1/352—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using bevel or epicyclic gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/34403—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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/032—Electric motors

Definitions

  • the present invention relates to a device for adjusting a camshaft of an internal combustion engine according to the preamble of patent claim 1.
  • valve timing In order to achieve optimum fuel consumption and exhaust gas values in various areas of the engine map, it is necessary to change the valve timing in dependence on various operating parameters. Such a change in the timing can be elegantly effected by a rotation of the camshaft with respect to the driving wheel.
  • the camshaft of an internal combustion engine is usually driven by a sprocket, which is connected to the crankshaft via a drive chain, or designed as a pulley drive wheel, which communicates via a toothed belt with the crankshaft.
  • GB 2 221 513 A shows an adjusting device for camshafts, in which a. Electric motor actuated a group of levers that rotate the camshaft relative to the drive wheel. For this purpose, an actuating element, on which the levers are articulated, is displaced in the axial direction.
  • Electric motor actuated a group of levers that rotate the camshaft relative to the drive wheel.
  • an actuating element, on which the levers are articulated is displaced in the axial direction.
  • A1 adjusting devices are known in which between an associated with the camshaft component and an associated with the drive wheel component an adjusting element is provided which has two helical gears, the with corresponding teeth of the camshaft and the drive wheel are engaged.
  • an axial displacement of this adjusting element By an axial displacement of this adjusting element, a rotation of the camshaft relative to the drive wheel can be effected.
  • One possibility of the axial displacement of the adjusting element is the actuation by a hydraulic piston, which is actuated in dependence on the required adjustment.
  • the disadvantage of this solution is that to achieve the required forces, a relatively large hydraulic piston is required, which is a major construction effort.
  • the oil consumption by the operation of the piston is relatively large, which is a load on the engine by a corresponding oil pump.
  • the camshaft can be switched back and forth only between two end positions.
  • DE 36 07 256 A describes a device in which a stepping motor for adjusting the camshaft is provided, which is connected on the one hand with the camshaft and on the other hand with the drive wheel. Since this stepper motor must absorb the entire drive torque of the camshaft, such a solution is not feasible with reasonable effort.
  • Object of the present invention is to develop a device of the above type such that with comparatively simple means a safe and reliable adjustment of the camshaft is achieved without limiting the life of the engine.
  • the electric motor in principle rotates with the camshaft and that due to the large reduction, which is given by the two threaded portions, a relatively low moment load of the electric motor can be achieved. In this way, a complex transmission of the actuating force can be avoided by a non-rotating electric motor to the rotating camshaft.
  • the inventive system is self-locking, so that an undesirable adjustment of the system can not take place. Furthermore, the system requires no bearings, which must accommodate the speed of the camshaft. The roller bearings of the system itself run at a total camshaft speed and only need to accommodate the rotation of the electric motor.
  • the camshaft is connected to a flange, that the electric motor is connected to a sleeve-shaped component and that the flange is fixedly connected to the sleeve-shaped component via connecting elements which pass through the drive wheel.
  • the flange is fixedly connected to the sleeve-shaped component via connecting elements which pass through the drive wheel.
  • bolts which connect the flange with the sleeve pass through arcuate slots in the drive wheel.
  • the drive shaft of the motor has a helically threaded portion which is in engagement with a threaded portion of the adjusting element. In this way, a very large reduction from a fast-running electric motor to a corresponding one
  • Axial movement of the adjustment can be effected.
  • the electric motor is designed as a stepping motor, this allows a simple control and reliable operation.
  • FIG. 1 a section through an embodiment variant of the present invention.
  • a non-illustrated camshaft of an internal combustion engine has a flange 2 at one end.
  • a camshaft drive member 4 is fixedly connected to the camshaft 1 via a screw 3.
  • the component 4 is connected via a mounted on its outer circumference helical threaded portion 4a with a threaded portion 5a of the adjusting element-5 in engagement.
  • the adjusting element 5 surrounds the component 4 and in turn has at its outer periphery a threaded portion 5b.
  • This threaded portion 5b is engaged with a threaded portion 6b of the drive wheel 6 for the camshaft 1, which is formed as a sprocket. In the teeth 6a of the sprocket 6 engages a drive chain, not shown.
  • the inner threaded portion 5a of the adjusting element 5 is formed in the opposite direction to the outer threaded portion 5b, so that by an axial displacement of the adjusting element 5, a rotation of the camshaft 1 with respect to the drive wheel 6 takes place.
  • a sleeve 7 With the flange 2 of the camshaft 1, a sleeve 7 is firmly connected. The connection is made by threaded bolts 8, which are screwed in the flange 2, and which are fastened with a nut 9 on the sleeve 7.
  • the threaded bolts 8 pass through holes 10 in the drive wheel 6, which holes 10 are formed as circular arc-shaped elongated holes.
  • Spacers 11, 12 and 13 establish a well-defined distance between the sleeve 7 and the flange 2 ago.
  • the spacer 12 is made smaller than the width of the slot 10, while the spacers 11 and 13 have a larger diameter.
  • the width of the spacer 12 corresponds exactly to the thickness of the drive wheel 6 in this section, so that the axial position of the drive wheel is fixed without play.
  • a spindle 14 has a External thread 14 a, via which it is engaged with the adjusting element 5.
  • the spindle 14 is driven by an electric motor 15 which is fixedly connected to the sleeve 7.
  • connection is made by screws 16, which connect the electric motor 15 with a fastened to the sleeve 7 connecting member 17.
  • the spindle 14 is mounted via a rolling bearing 20 in the radial direction relative to the component 17.
  • a locking ring 21 secures the outer ring of the rolling bearing 20.
  • the spindle 14 is fixed by a thrust bearing 22 in position.
  • the thrust bearing 22 is supported on the one hand on an abutting on a shoulder of the sleeve 7 disc 23, and on the other hand on a disc 24, which is connected by a nut 25 with the sleeve 7.
  • a shaft seal 26 prevents the ingress of engine oil to the electric motor 15.
  • the shaft seal 26 is fixed with its outer periphery with the sleeve 7.
  • a nut 27 defines, via a sleeve 28, the exact axial position of the spindle 14 with respect to the thrust bearing 22.
  • the engine 15 is fixedly connected to the camshaft 1.
  • the output shaft 29 of the motor 15 rotates the spindle 14.
  • the rotation of the spindle 14 relative to the camshaft 1 is caused to displace the adjustment member 5 along the threaded portion 14a in the axial direction, for example, to the left in FIG. 1.
  • By this displacement takes place a rotation of the component 4, relative to the drive wheel 6 according to the opposite threaded portions 4a / 5a and 6b / 5b.
  • the camshaft 1 is adjusted with respect to the drive wheel 6.
  • an unillustrated further shaft seal must be provided on the outside of the sleeve 7, which is externally mounted in a corresponding partition, which is also not shown. Due to the large ratio of the electric motor 15 can be achieved that even with a relatively low torque secure adjustment can be achieved.
  • the present invention makes it possible to easily and safely change the timing of valves of an internal combustion engine. It is particularly advantageous that any intermediate positions can be controlled.

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)

Claims (7)

  1. Dispositif pour régler un arbre à cames (1) d'un moteur à combustion interne par rapport à la roue (6) qui l'entraîne à l'aide d'un élément de réglage (5) d'une part en prise avec une pièce portant la roue d'entraînement (6) et d'autre part en prise avec une pièce (4) solidaire de l'arbre à cames (1),
    dans lequel
    l'élément de réglage (5) comporte un premier segment fileté (5a) en prise avec un segment fileté (4a) de la pièce (4) reliée solidairement à l'arbre à cames (1) ainsi qu'un second segment fileté (5b) en prise avec un segment fileté (6b) de la pièce portant la roue d'entraînement (6), de façon qu'un coulissement axial de l'élément de réglage (5) produise une rotation de l'arbre à cames (1) par rapport à la roue d'entraînement (6),
    caractérisé par
    un moteur électrique (15) pour déplacer l'élément d'actionnement (5) dans la direction axiale, ce moteur étant relié solidairement à l'arbre à cames (1) et son alimentation électrique étant assurée par des contacts à glissement (19).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    l'arbre à cames (1) est relié à une bride (2), le moteur électrique (15) est relié à une pièce (7) en forme de manchon et la bride (2) est reliée solidairement à la pièce en forme de manchon (7) par des éléments de liaison (8) traversant la roue d'entraînement (6).
  3. Dispositif selon l'une des revendications 1 à 2,
    caractérisé en ce que
    l'arbre d'entraînement (29) du moteur (15) comporte un segment à denture en biais en prise avec un segment fileté de l'élément de réglage.
  4. Dispositif selon l'une des revendications 1 à 3,
    caractérisé en ce que
    le premier segment fileté (5a) et le second segment fileté (5b) sont prévus sur le côté intérieur et le côté extérieur d'un corps cylindrique creux.
  5. Dispositif selon l'une des revendications 1 à 4,
    caractérisé en ce que
    le moteur électrique (15) est un moteur pas à pas.
  6. Dispositif selon l'une des revendications 1 à 5,
    caractérisé en ce que
    le moteur électrique (15) est un moteur réducteur.
  7. Moteur à combustion interne caractérisé par un dispositif selon l'une des revendications 1 à 6.
EP98890261A 1997-09-19 1998-09-10 Dispositif pour varier le calage d'un arbre à cames de moteur à combustion interne Expired - Lifetime EP0903470B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT98890261T ATE249573T1 (de) 1997-09-19 1998-09-10 Vorrichtung zur verstellung einer nockenwelle einer brennkraftmaschine mit innerer verbrennung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT1586/97 1997-09-19
AT0158697A AT407282B (de) 1997-09-19 1997-09-19 Vorrichtung zur verstellung einer nockenwelle
AT158697 1997-09-19

Publications (2)

Publication Number Publication Date
EP0903470A1 EP0903470A1 (fr) 1999-03-24
EP0903470B1 true EP0903470B1 (fr) 2003-09-10

Family

ID=3516627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98890261A Expired - Lifetime EP0903470B1 (fr) 1997-09-19 1998-09-10 Dispositif pour varier le calage d'un arbre à cames de moteur à combustion interne

Country Status (4)

Country Link
US (1) US5979382A (fr)
EP (1) EP0903470B1 (fr)
AT (2) AT407282B (fr)
DE (1) DE59809548D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2194242A1 (fr) 2008-12-04 2010-06-09 Pierburg GmbH Dispositif de décalage de phase de l'angle de rotation d'une roue motrice par rapport à un arbre mené

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE59802310D1 (de) * 1997-09-19 2002-01-17 Tcg Unitech Ag Vorrichtung zur verstellung der nockenwelle einer brennkraftmaschine mit innerer verbrennung
US6302073B1 (en) * 1999-03-23 2001-10-16 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
US6328006B1 (en) * 1999-03-23 2001-12-11 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
AT409786B (de) * 1999-03-23 2002-11-25 Tcg Unitech Ag Vorrichtung zur verstellung einer nockenwelle einer brennkraftmaschine mit innerer verbrennung
US6257186B1 (en) * 1999-03-23 2001-07-10 Tcg Unitech Aktiengesellschaft Device for adjusting the phase angle of a camshaft of an internal combustion engine
US6199522B1 (en) * 1999-08-27 2001-03-13 Daimlerchrysler Corporation Camshaft phase controlling device
US6202611B1 (en) * 1999-12-23 2001-03-20 Daimlerchrysler Corporation Camshaft drive device for an internal combustion engine
DE10116707B4 (de) * 2001-04-04 2017-01-19 Schaeffler Technologies AG & Co. KG Vorrichtung zur Relativverdrehung einer Nockenwelle gegenüber einer Kurbelwelle einer Brennkraftmaschine
DE10207760B4 (de) * 2002-02-23 2019-10-31 Schaeffler Technologies AG & Co. KG Vorrichtung zum lösbaren Verbinden und Verstellen zweier zueinander drehwinkelverstellbarer Wellen
DE10220687A1 (de) * 2002-05-10 2003-11-20 Ina Schaeffler Kg Nockenwellenversteller mit elektrischem Antrieb
JP4012445B2 (ja) * 2002-08-13 2007-11-21 株式会社日立製作所 内燃機関の可変動弁装置
WO2006047099A2 (fr) 2004-10-26 2006-05-04 George Louie Dispositif de commande de distribution à réglage continu
JP4240488B2 (ja) * 2005-02-01 2009-03-18 株式会社デンソー バルブリフト制御装置のアクチュエータ
JP4987031B2 (ja) * 2009-04-27 2012-07-25 日立オートモティブシステムズ株式会社 内燃機関のバルブタイミング制御装置
US9534513B2 (en) * 2014-01-16 2017-01-03 Delphi Technologies, Inc. Camshaft phaser actuated by an electric motor
FR3027055B1 (fr) * 2014-10-14 2021-11-05 Renault Sas Commande de decalage d'instants d'ouverture/fermeture de soupapes d'un moteur de vehicule automobile

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2194242A1 (fr) 2008-12-04 2010-06-09 Pierburg GmbH Dispositif de décalage de phase de l'angle de rotation d'une roue motrice par rapport à un arbre mené
DE102008060219A1 (de) 2008-12-04 2010-06-17 Pierburg Gmbh Vorrichtung zur Phasenverschiebung des Drehwinkels eines Antriebsrades zu einer Antriebswelle
DE102008060219B4 (de) * 2008-12-04 2011-07-14 Pierburg GmbH, 41460 Vorrichtung zur Phasenverschiebung des Drehwinkels eines Antriebsrades zu einer Abtriebswelle

Also Published As

Publication number Publication date
AT407282B (de) 2001-02-26
EP0903470A1 (fr) 1999-03-24
US5979382A (en) 1999-11-09
ATA158697A (de) 2000-06-15
DE59809548D1 (de) 2003-10-16
ATE249573T1 (de) 2003-09-15

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