EP1783333A1 - Variable Nockenverstellvorrichtung - Google Patents

Variable Nockenverstellvorrichtung Download PDF

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Publication number
EP1783333A1
EP1783333A1 EP05256822A EP05256822A EP1783333A1 EP 1783333 A1 EP1783333 A1 EP 1783333A1 EP 05256822 A EP05256822 A EP 05256822A EP 05256822 A EP05256822 A EP 05256822A EP 1783333 A1 EP1783333 A1 EP 1783333A1
Authority
EP
European Patent Office
Prior art keywords
drive
actuator
driven members
follower
coupling means
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Withdrawn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
EP05256822A
Other languages
English (en)
French (fr)
Inventor
Peter Baur
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 EP05256822A priority Critical patent/EP1783333A1/de
Publication of EP1783333A1 publication Critical patent/EP1783333A1/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Withdrawn legal-status Critical Current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
    • 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

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 timing of the opening and closing of the valves
  • Such system are required to efficiently convert rotational movement from the drive shaft into rotational movement of the cam shaft whilst allowing dislocation between these rotational movements in order to allow variation of the cam phase.
  • Current systems typically utilise hydraulic actuators using high pressure oil to enable relative angular displacement between drive and driven members (e.g. cam sprocket and cam shaft) of the valve train.
  • a variable cam phaser comprising coaxial drive and driven members drivingly connected by a coupling means, said coupling means enabling said drive and driven members to be relatively angularly adjusted while maintaining driving engagement therebetween, the coupling means comprising at least one actuator mounted on one of said drive and driven members, the actuator including a displacement member engaging and co-operable with a follower mounted on the other of said drive and driven members, whereby operation of said actuator causes relative angular displacement between the drive and driven members.
  • the displacement member comprises a rotatable elongate member extending from and being rotatable by said actuator, said elongate member being arranged substantially tangentially to a circle coaxial with the drive and driven members, the elongate member being provided with a threaded portion engaging said follower, said follower having formations cooperating with said threaded portion whereby rotation of the elongate member causes axial displacement of the follower with respect to the elongate member.
  • the or each actuator and the or each follower may be respectively mounted for pivotal movement about an axis substantially parallel to the rotational axis of the drive or driven member.
  • said actuator comprises an electric motor. Electrical power may be supplied to the motor via slip rings mounted on a shaft connected to and coaxial with one of said drive and driven members.
  • a camshaft 10 is typically driven by a cam sprocket 12 which is in turn rotatably driven by the crankshaft of the engine via a toothed drive belt or chain (not shown).
  • a coupling means provides a connection between the cam shaft 10 and sprocket 12 and enables the camshaft 10 and sprocket 12 to be relatively angularly adjusted while maintaining driving engagement therebetween, as will be described below.
  • the coupling means comprises two direct current electric motors 14,16 mounted on radially extending support members 18,20 connected to the camshaft 12.
  • the output shaft from each motor 14,16 comprises a threaded lead screw 22,24.
  • Each electric motor 14,16 is pivotally mounted on the respective support member 18,20 to permit each motor 14,16 to pivot about an axis parallel to the rotational axis of the camshaft 10 and sprocket 12.
  • Each lead screw 22,24 engages a cooperating nut 26,28 respectively mounted on the cam sprocket 12 whereby rotation of each lead screw 22,24 by the respective electric motor 14,16 causes translational movement of the associated nut 26,28 along the lead screw 22,24.
  • Each nut 26,28 is pivotally mounted on the sprocket 12 to permit each nut 26,28 to pivot about an axis parallel to the rotational axis of the camshaft 10 and sprocket 12.
  • the electric motors 14,16 are operated to rotate the lead screws 22,24 whereby each nut 26,28 translates along its associated lead screw 22,24 to adjust the angular position of the sprocket 12 with respect to the camshaft 10.
  • Rotation of the lead screws 22,24 in a first direction will cause the nuts 26,28 to move away from the associated motor 14,16, advancing the timing of the opening and closing of the associated valves while rotation of the lead screws 22,24 in a second opposite direction will cause the nuts 26,28 to move towards the associated motor 14,16, retarding the timing of the opening and closing of the associated valves.
  • a single electric motor 14' may be required with a single lead screw 22' and associated nut 26' mounted on the sprocket 12.
  • a balance weight 40 on the sprocket 12 at a position radially opposite said motor 14'.
  • the system described allows the phase of the cam shaft to be reliably altered whilst the engine is running.
  • the cam phase may be advanced or retarded depending upon the direction in which the lead screws 22,24 are rotated. Such adjustment may be controlled by the engine management system of typical automobiles.
  • the system therefore effectively allows the rotational position of the cam shaft 10 to be varied relative to the rotational position of the sprocket 12.
  • the cam phase has been adjusted into the advanced / retarded position it will remain in that position until it is positively re-adjusted by the engine management system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP05256822A 2005-11-04 2005-11-04 Variable Nockenverstellvorrichtung Withdrawn EP1783333A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05256822A EP1783333A1 (de) 2005-11-04 2005-11-04 Variable Nockenverstellvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05256822A EP1783333A1 (de) 2005-11-04 2005-11-04 Variable Nockenverstellvorrichtung

Publications (1)

Publication Number Publication Date
EP1783333A1 true EP1783333A1 (de) 2007-05-09

Family

ID=36282658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05256822A Withdrawn EP1783333A1 (de) 2005-11-04 2005-11-04 Variable Nockenverstellvorrichtung

Country Status (1)

Country Link
EP (1) EP1783333A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1691408A (en) * 1927-03-18 1928-11-13 Palmer Walter Tuttle Timing device
US3812734A (en) * 1973-01-30 1974-05-28 E Hamburger Externally adjustable cam timer
DE4040486A1 (de) * 1990-06-22 1992-01-02 Schrick Gmbh Dr Vorrichtung bei verbrennungsmotoren zur drehung der nockenwelle relativ zum nockenwellenantriebsrad
US5156119A (en) * 1990-07-31 1992-10-20 Atsugi Unisia Corp. Valve timing control apparatus
EP1030090A2 (de) * 1999-02-18 2000-08-23 Continental ISAD Electronic Systems GmbH & Co. KG Gaswechselventil mit elektromagnetischer Stelleinrichtung
US20010006050A1 (en) * 2000-01-04 2001-07-05 Siegfried Heer Transmission

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1691408A (en) * 1927-03-18 1928-11-13 Palmer Walter Tuttle Timing device
US3812734A (en) * 1973-01-30 1974-05-28 E Hamburger Externally adjustable cam timer
DE4040486A1 (de) * 1990-06-22 1992-01-02 Schrick Gmbh Dr Vorrichtung bei verbrennungsmotoren zur drehung der nockenwelle relativ zum nockenwellenantriebsrad
US5156119A (en) * 1990-07-31 1992-10-20 Atsugi Unisia Corp. Valve timing control apparatus
EP1030090A2 (de) * 1999-02-18 2000-08-23 Continental ISAD Electronic Systems GmbH & Co. KG Gaswechselventil mit elektromagnetischer Stelleinrichtung
US20010006050A1 (en) * 2000-01-04 2001-07-05 Siegfried Heer Transmission

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