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EP2017436A1 - Variable Nockenverstellvorrichtung - Google Patents

Variable Nockenverstellvorrichtung Download PDF

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Publication number
EP2017436A1
EP2017436A1 EP07252466A EP07252466A EP2017436A1 EP 2017436 A1 EP2017436 A1 EP 2017436A1 EP 07252466 A EP07252466 A EP 07252466A EP 07252466 A EP07252466 A EP 07252466A EP 2017436 A1 EP2017436 A1 EP 2017436A1
Authority
EP
European Patent Office
Prior art keywords
cam phaser
rotor
drive
gear system
triple
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07252466A
Other languages
English (en)
French (fr)
Inventor
Philippe-Siad Farah
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP07252466A priority Critical patent/EP2017436A1/de
Publication of EP2017436A1 publication Critical patent/EP2017436A1/de
Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/352—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using bevel or epicyclic gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/352—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using bevel or epicyclic gear
    • F01L2001/3521—Harmonic drive of flexspline type

Definitions

  • the present invention relates to a cam phaser apparatus, particularly, but not exclusively a variable cam phaser apparatus used in valve trains of automobile engines.
  • cam phase i.e. the angular relationship between the crankshaft and the camshaft
  • Such systems are required to efficiently convert rotational movement from the crankshaft into rotational movement of the camshaft whilst allowing dislocation between these rotational movements in order to allow variation of the cam phase.
  • triple shaft gear systems suitable for use with a cam phaser comprise planetary gear systems, with a sun gear, planetary gears mounted on a planet carrier and a ring gear, or harmonic drive systems with a wave generator, flex-spline and circular spline.
  • triple member system equivalent to a planetary gear system comprises a magnetic gear having an outer ring comprising a plurality of magnets (equivalent to the ring gear), a concentric inner ring comprising a plurality of circumferentially spaced magnets (equivalent to a sun gear) and an intermediate ring or carrier member mounted in an annular space between said outer and inner rings and comprising a plurality of circumferentially spaced pole pieces (equivalent to planetary carrier upon which a plurality of planetary gears are mounted).
  • one shaft is connected to the cam sprocket or pulley to comprise a drive member (typically the planet carrier or circular spline) and a second shaft is connected to the camshaft (typically the ring gear or the flex-spline) to comprise a driven member, the remaining third shaft (typically the sun gear or wave generator) being connected to an actuator for varying the cam phase (i.e. the angular relationship between the drive and driven members).
  • a drive member typically the planet carrier or circular spline
  • the camshaft typically the ring gear or the flex-spline
  • the remaining third shaft typically the sun gear or wave generator
  • the actuator normally comprises an electric motor having a stator fixed to the engine and a rotor mounted on the adjusting part of the cam phaser.
  • DC direct current
  • AC brushless alternating current
  • a problem with simple single phase brushless AC motors is that the conventional single-phase motor has certain rotor positions for which it is not self-starting, even when the stator windings are energized full wave. Such rotor positions are generally referred to as null positions.
  • the performance range of such arrangements of synchronous motors is also limited, in particular by the irregular torque profile in the start-up range.
  • the motor is constructed with an asymmetrical stator and/or rotor air gap geometry which serves to preposition the rotor so that starting is not attempted from a null position.
  • the motor is effectively operated as a two-phase machine by providing a separate starting winding, and energizing it with phase displaced current.
  • the phase displaced current is typically generated with an impedance element such as a capacitor.
  • three phase motors are therefore generally used in preference to single phase motors.
  • three phase motors require a full electronic bridge, three winding phases on the stator and three sensors, increasing the cost and complexity of the cam phaser.
  • an electrically actuated cam phaser apparatus for transferring a driving torque from a drive member to a driven member and for selectively adjusting the angular relationship between the drive and driven members, wherein the cam phaser includes an actuator comprising a single phase brushless electric motor having a rotor and a stator, whereby the rotor is rotatably driven by the drive member.
  • the cam phaser apparatus comprising a triple member gear system said triple member gear system comprising a first member connectable to said driven member, a second member connectable to said drive member, and a third member comprising an adjusting means of said triple member gear system, said third member being connected to said actuator for applying a braking torque and/or a motoring torque to said third member to vary the angular relationship between the first and second members, the rotor being directly connected to or mounted on the third member.
  • the triple member gear system may be one of a planetary gear system, a harmonic drive or a magnetic gear,
  • the actuator By drivingly connecting the rotor to the drive member, via the triple gear system, the actuator will never need to supply or absorb torque at 0 rpm, and therefore there is no need for a 0rpm starting torque capability for the actuator.
  • an internal combustion engine having a cam phaser apparatus in accordance with the abovementioned first aspect of the invention.
  • stator is mounted on the cylinder head of the engine and the rotor is mounted on the third member of the cam phaser apparatus.
  • the cam phaser apparatus includes a first member 1 of a triple member gear system, said first member 1 being connected to a crankshaft of the engine via a pulley or cam sprocket and an endless belt or chain.
  • first member 1 could be the planet carrier and planetary gears.
  • first member 1 could be the circular spline.
  • first member 1 could be the intermediate ring or pole pieces.
  • the camshaft of the engine is connected to a second member 2 of the triple member gear system.
  • the second member 2 could be the ring gear.
  • the second member 2 could be the flex-spline.
  • the second member 2 could be the outer ring.
  • a third member 3 of the triple member gear system is connected to a single phase brushless electric motor 4 for altering the cam phase of the engine.
  • the third member 3 could be the sun gear.
  • the third member 3 could be the wave generator.
  • the third member 3 could be the inner ring.
  • the housing of the motor is fixed with respect to the cylinder head while the rotor of the motor rotates with the camshaft.
  • a braking torque is applied to the third member 3 by the electric motor 4 to decelerate the third member 3, thus advancing the camshaft angle with respect to the crankshaft.
  • a motoring torque is applied to the third member 3 by the electric motor to accelerate the third member 3, thus retarding the camshaft angle with respect to the crankshaft.
  • the motor 4 Because the rotor of the motor 4 is effectively rotatably driven by the engine, via the camshaft pulley, when the engine is operating, the motor will never need to supply or absorb torque at 0 rpm, and therefore there is no need for a 0 rpm starting torque capability for the motor and a simple single phase AC electric motor can be readily used.

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)
EP07252466A 2007-06-16 2007-06-16 Variable Nockenverstellvorrichtung Withdrawn EP2017436A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07252466A EP2017436A1 (de) 2007-06-16 2007-06-16 Variable Nockenverstellvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07252466A EP2017436A1 (de) 2007-06-16 2007-06-16 Variable Nockenverstellvorrichtung

Publications (1)

Publication Number Publication Date
EP2017436A1 true EP2017436A1 (de) 2009-01-21

Family

ID=38704970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07252466A Withdrawn EP2017436A1 (de) 2007-06-16 2007-06-16 Variable Nockenverstellvorrichtung

Country Status (1)

Country Link
EP (1) EP2017436A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014008988A1 (en) * 2012-07-10 2014-01-16 Iwis Motorsysteme Gmbh & Co. Kg Chain-based transfer device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918142A2 (de) * 1997-11-21 1999-05-26 Mazda Motor Corporation Vorrichtung zur Steuerung der Drehphase
WO2003071099A1 (de) * 2002-02-23 2003-08-28 Ina-Schaeffler Kg Vorrichtung zum lösbaren verbinden und verstellen zweier zueinander drehwinkelverstellbarer wellen
WO2003095803A1 (de) * 2002-05-10 2003-11-20 Ina-Schaeffler Kg Nockenwellenversteller mit elektrischem antrieb
WO2004007919A1 (de) * 2002-07-11 2004-01-22 Ina-Schaeffler Kg Regelstruktur für den verstellmotor eines elektrischen nockenwellenverstellers
US20050081809A1 (en) * 2003-10-16 2005-04-21 Denso Corporation Valve timing controller
US20050103299A1 (en) * 2002-07-11 2005-05-19 Ina-Schaeffler Kg Electrically driven camshaft

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918142A2 (de) * 1997-11-21 1999-05-26 Mazda Motor Corporation Vorrichtung zur Steuerung der Drehphase
WO2003071099A1 (de) * 2002-02-23 2003-08-28 Ina-Schaeffler Kg Vorrichtung zum lösbaren verbinden und verstellen zweier zueinander drehwinkelverstellbarer wellen
WO2003095803A1 (de) * 2002-05-10 2003-11-20 Ina-Schaeffler Kg Nockenwellenversteller mit elektrischem antrieb
WO2004007919A1 (de) * 2002-07-11 2004-01-22 Ina-Schaeffler Kg Regelstruktur für den verstellmotor eines elektrischen nockenwellenverstellers
US20050103299A1 (en) * 2002-07-11 2005-05-19 Ina-Schaeffler Kg Electrically driven camshaft
US20060124095A1 (en) * 2002-07-11 2006-06-15 Ina-Schaeffler Kg Control structure for the adjusting motor of an electric camshaft adjuster
US20050081809A1 (en) * 2003-10-16 2005-04-21 Denso Corporation Valve timing controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014008988A1 (en) * 2012-07-10 2014-01-16 Iwis Motorsysteme Gmbh & Co. Kg Chain-based transfer device

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