EP0656094B1 - Phasenverschiebungsvorrichtung - Google Patents

Phasenverschiebungsvorrichtung Download PDF

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Publication number
EP0656094B1
EP0656094B1 EP93917884A EP93917884A EP0656094B1 EP 0656094 B1 EP0656094 B1 EP 0656094B1 EP 93917884 A EP93917884 A EP 93917884A EP 93917884 A EP93917884 A EP 93917884A EP 0656094 B1 EP0656094 B1 EP 0656094B1
Authority
EP
European Patent Office
Prior art keywords
coupling element
drive
eccentric
camshaft
phase change
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
EP93917884A
Other languages
English (en)
French (fr)
Other versions
EP0656094A1 (de
Inventor
Thomas Tsoi-Hei Ma
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.)
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
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 Ford Werke GmbH, Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Werke GmbH
Publication of EP0656094A1 publication Critical patent/EP0656094A1/de
Application granted granted Critical
Publication of EP0656094B1 publication Critical patent/EP0656094B1/de
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
    • F01L1/34409—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 by torque-responsive means
    • 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
    • F01L2820/035—Centrifugal forces

Definitions

  • the invention relates to a phase change mechanism for varying the phase of an engine camshaft relative the engine crankshaft, comprising a drive member to be connected to the camshaft drive, a driven member to be connected to the camshaft, an eccentric mounted for rotation about the axis of the camshaft, a coupling element mounted about the eccentric and acting to transmit torque from the drive member to the driven member, and means for rotating the eccentric to move the coupling element relative to the drive and driven members and thereby vary the phase between the drive and driven members.
  • phase change mechanisms are described in the prior art using a wide variety of techniques and principles.
  • a mechanism which bears a close resemblance to that of the present invention is that described in the Applicants' own earlier PCT Patent Publication No. WO90/10788.
  • This publication discloses a phase change mechanism for a camshaft of an internal combustion engine, which comprises a drive member to be connected by a toothed belt to the crankshaft, a driven member to be connected to the camshaft and a coupling element for transmitting torque from the drive member to the driven member.
  • the coupling element is connected for rotation with the drive and driven members in such a manner that the phase of the driven member relative to the drive member depend on the position of the coupling element.
  • An inertial member is connected to the coupling element by an eccentric crank that causes the coupling element to move between two end positions when the inertial member rotates relative to the drive and driven members.
  • phase change mechanism for varying the phase of an engine camshaft relative the engine crankshaft, comprising a drive member to be connected to the camshaft drive, a driven member to be connected to the camshaft, a coupling element for transmitting torque from the drive member to the driven member and movable relative to the drive and driven members to vary the phase between the drive and driven members, an inertial member coupled by means of a one-way clutch for rotation with the drive and driven members and having an eccentric crank thereon acting on the coupling element to vary the position of the coupling element in dependence of the angular position of the inertial member, and latching means for arresting rotation of the inertial member at predetermined angular positions, characterised in that the latching means comprise an abutment surface projecting radially from the inertial member, a latch member mounted on one of the drive and driven members for transverse
  • the present invention is concerned with reducing noise in phase change mechanisms of the types described above in which a coupling element connecting the drive member to the driven member is moved by an eccentric in order to vary the phase of the drive between the drive and driven members.
  • a phase change mechanism for varying the phase of an engine camshaft relative the engine crankshaft, comprising a drive member to be connected to the camshaft drive, a driven member to be connected to the camshaft, an eccentric mounted for rotation about the axis of the camshaft, a coupling element mounted about the eccentric and acting on pins secured to the drive member and driven member, respectively, to transmit torque from the drive member to the driven member, and drive means for rotating the eccentric to move the coupling element relative to the drive and driven members and thereby vary the phase between the drive and driven members, characterised by noise suppression means for constantly applying an additional spring or centrifugal force to the coupling element during rotation of the phase change mechanism, the force acting in a direction parallel to the line extending between the centres of the pins and serving to maintain the same side of the coupling element in constant contact with the eccentric.
  • the drive means for rotating the eccentric may comprise a one-way clutch acting to permit rotation of the eccentric in only one direction, the forces causing the rotation of the eccentric being derived from the torque reversals acting on the camshaft.
  • the torque reversals are used as the means for driving the eccentric, they are always present and as a clearance is unavoidable between the coupling element and the eccentric there is a tendency for the coupling element to chatter about the eccentric.
  • the forces tending to cause the coupling element to chatter act along a line generally perpendicular to the line extending between the pins connected to the drive and driven members. A spring acting in this direction would tend to neutralise the effect of the torque reversals and interfere with the operation of the mechanism.
  • a force is applied in a direction transverse to the line of action of the force reversals and it acts to maintain one side of the coupling element in permanent contact with the eccentric at a point on its circumferences.
  • the force reversals in the presence of such a force do not cause the coupling element to chatter but instead the two components remain in contact and only the point of contact moves silently about its central position.
  • rotary imbalance in the coupling element giving rise to a centrifugal force during rotation of the mechanism, may be used to apply the desired additional force bias to the coupling element to prevent noise, it is preferred to use a spring as this does not interfere with the balance of the phase change mechanism.
  • the coupling element is preferably made as a single rigid component carrying slider blocks journalled on the respective pins and slidable in slots formed in the coupling element. With such a construction, clearance between the slider block and the slots in the coupling element will again cause chatter on account of the reversal of the reaction forces.
  • the faces of the slider blocks in contact with the coupling element be tapered and that the sides of the slots should have a complementary taper so that by moving the slider blocks parallel to the tapering axis, the clearances between the slider blocks and the slots may be taken up.
  • the phase change mechanism in the drawings is formed as a drive pulley for the camshaft of an engine.
  • the pulley has an outer toothed drive member 10 which is engaged by a toothed belt passing around the crankshaft pulley.
  • the drive member 10 is journalled for rotation about a driven member 14 which has a central hub 14' for connection to the engine camshaft.
  • the drive member 10 has a radial extension on which is mounted a pin 12 and a second pin 16 is mounted on the driven member 14. Torque is transmitted from the drive member 10 to the driven member 14 through the pins 12 and 16 which engage a coupling element 18 in the form of a yoke with two diametrically opposed slots in which the pins engage.
  • the coupling element 18 can move relative to the drive member 10 and the driven member 14 and such movement result in a change in the phase between these two members.
  • the coupling element 18 carries slider blocks 13, 15 at its opposite ends, in which blocks the pins 12 and 16 are journalled.
  • the slider blocks can slide relative to the coupling element 18 and for this purpose they are received in parallel sided open slots in the ends of the coupling element 18.
  • the sides of the slider blocks 13, 15 and the slots in the coupling element 18 taper in opposite directions, as shown in Figure 3 and retainers or leaf springs 32 held by bolts 30 on the coupling element 18 urge the slider blocks 13, 15 in the direction to take up lateral play between the slider blocks and the sides of the slots in the coupling element 18.
  • the coupling element 18 has a central circular aperture which is journalled about an eccentric crank 20 which projects axially from an inertial member which is mounted on the hub of the driven member 14 through a one-way or overrunning clutch 22. In this way the inertial member can rotate freely about the hub but in only one direction.
  • the invention proposes the application of an additional constant force as represented by the arrows 19 and 19' which tends to keep the coupling element 18 and the eccentric 20 in contact at or near the 3 O'clock position.
  • the effect of the torque reversals will then be to cause the point of contact to oscillate quietly about this 3 O'clock position but without jumping from one side of the coupling element 18 to the other.
  • the arrows in Figure 1 are intended to represent springs acting between the opposite sides of the coupling element 18 and anchoring points 11, 11' on the driven member 14. It is not however essential to use springs in that if the coupling element 18 is designed such that its centre of gravity is offset to one side of the axis of the camshaft, then the centrifugal force acting on the coupling element 18 will achieve the same objective. Springs are however preferred as the balance of the camshaft drive pulley is not then disturbed.

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  • 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 (4)

  1. Eine Phasenverschiebungsvorrichtung zur Veränderung der Phase einer Motor-Nockenwelle im Verhältnis zur Motor-Kurbelwelle, bestehend aus einem Antriebsteil (10), der mit dem Nockenwellenantrieb verbunden wird, einem angetriebenen Teil (14), der mit der Nockenwelle verbunden wird, einem Exzenter (20), der zum Rotieren um die Achse der Nockenwelle montiert wird, einem Kupplungselement (18), das um den Exzenter (20) montiert wird und auf die Bolzen (12, 16) einwirkt, die jeweils am Antriebsteil (10) und am angetriebenen Teil (14) befestigt sind, um das Drehmoment vom Antriebsteil (10) zum angetriebenen Teil (14) zu übertragen, sowie einer Antriebsvorrichtung (22) zum Rotieren des Exzenters, um das Kupplungselement (18) im Verhältnis zum Antriebsteil und zum angetriebenen Teil (10, 14) zu bewegen und dadurch die Phase zwischen dem Antriebsteil und dem angetriebenen Teil zu verändern, gekennzeichnet durch eine Vorrichtung zur Lärmbeseitigung (19), um ständig eine zusätzliche Feder- oder Zentrifugalkraft auf das Kupplungselement (18) während des Rotierens der Phasenverschiebungsvorrichtung einwirken zu lassen, wobei die Kraft in einer Richtung wirkt, die parallel zur Linie ist, die sich zwischen den Mittelpunkten der Bolzen (12, 16) erstreckt und dazu dient, die gleiche Seite des Kupplungselements (18) in ständigem Kontakt mit dem Exzenter (20) zu halten.
  2. Eine Phasenverschiebungsvorrichtung nach Anspruch 1, in der die Antriebsvorrichtung zum Rotieren des Exzenters eine einseitig gerichtete Kupplung (22) enthält, die tätig wird, um das Rotieren des Exzenters (20) in nur einer Richtung zu ermöglichen, wobei die Kräfte, die das Rotieren des Exzenters (20) bewirken, von auf die Nockenwelle einwirkende Drehmomentumkehrungen abgeleitet werden.
  3. Eine Phasenverschiebungsvorrichtung nach Anspruch 1 oder 2, in der das Kupplungselement (18) als ein einziger unbiegsamer Bauteil ausgelegt ist, der die Gleitstücke (13, 15) trägt, die auf den jeweiligen Bolzen (12, 16) befestigt sind und in Schlitze gleiten, die im Kupplungselement (18) angebracht sind.
  4. Eine Phasenverschiebungsvorrichtung nach Anspruch 3, in der die Flächen der Gleitstücke (13, 15), die mit dem Kupplungselement (18) in Kontakt sind, abgeschrägt sind und die Seiten der Schlitze in dem Kupplungselement (18) eine zusätzliche Abschrägung aufweisen.
EP93917884A 1992-07-22 1993-07-22 Phasenverschiebungsvorrichtung Expired - Lifetime EP0656094B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9215560 1992-07-22
GB9215560A GB2268998A (en) 1992-07-22 1992-07-22 A phase change mechanism with noise reduction elements
PCT/GB1993/001540 WO1994002716A1 (en) 1992-07-22 1993-07-22 Phase change mechanism

Publications (2)

Publication Number Publication Date
EP0656094A1 EP0656094A1 (de) 1995-06-07
EP0656094B1 true EP0656094B1 (de) 1996-04-03

Family

ID=10719102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917884A Expired - Lifetime EP0656094B1 (de) 1992-07-22 1993-07-22 Phasenverschiebungsvorrichtung

Country Status (5)

Country Link
EP (1) EP0656094B1 (de)
JP (1) JPH07509035A (de)
DE (1) DE69302097T2 (de)
GB (1) GB2268998A (de)
WO (1) WO1994002716A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9325168D0 (en) * 1993-12-08 1994-02-09 Frost Derek Variable valve timing
DE19502836C2 (de) * 1995-01-30 2000-02-24 Erwin Korostenski Brennkraftmaschine
DE102016007818A1 (de) * 2016-06-23 2017-12-28 Daimler Ag Verstellgetriebe mit einer verzahnungsfreien Wirkverbindung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492557A1 (de) * 1990-12-28 1992-07-01 Unisia Jecs Corporation Ventilsteuerung-Kontrollsystem für Verbrennungsmotor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1193451B (it) * 1986-07-22 1988-06-22 Weber Spa Dispositivo per la regolazione automatica dell anticipo dell iniezione per un motore a combustione interna ad accensione per compressione
DE69013680T2 (de) * 1989-03-15 1995-03-02 Ford Werke Ag Phasenverschiebungsvorrichtung.
US5040651A (en) * 1990-07-17 1991-08-20 Eaton Corporation Self actuator for cam phaser with sprag clutch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492557A1 (de) * 1990-12-28 1992-07-01 Unisia Jecs Corporation Ventilsteuerung-Kontrollsystem für Verbrennungsmotor

Also Published As

Publication number Publication date
JPH07509035A (ja) 1995-10-05
GB9215560D0 (en) 1992-09-02
WO1994002716A1 (en) 1994-02-03
DE69302097T2 (de) 1996-09-05
DE69302097D1 (de) 1996-05-09
EP0656094A1 (de) 1995-06-07
GB2268998A (en) 1994-01-26

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