EP1179657A1 - Distribution variable - Google Patents

Distribution variable Download PDF

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Publication number
EP1179657A1
EP1179657A1 EP01000338A EP01000338A EP1179657A1 EP 1179657 A1 EP1179657 A1 EP 1179657A1 EP 01000338 A EP01000338 A EP 01000338A EP 01000338 A EP01000338 A EP 01000338A EP 1179657 A1 EP1179657 A1 EP 1179657A1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
cam sleeve
pin
rotation
drive member
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
EP01000338A
Other languages
German (de)
English (en)
Other versions
EP1179657B1 (fr
Inventor
Ian METHLEY
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.)
Mechadyne PLC
Original Assignee
Mechadyne PLC
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 Mechadyne PLC filed Critical Mechadyne PLC
Publication of EP1179657A1 publication Critical patent/EP1179657A1/fr
Application granted granted Critical
Publication of EP1179657B1 publication Critical patent/EP1179657B1/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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01L1/356—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 making the angular relationship oscillate, e.g. non-homokinetic drive
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the present invention to relates to a mechanism for enabling the duration of a valve event in an internal combustion engine to be varied.
  • valve event the proportion of an engine cycle measured in crankshaft angle during which the valve remains open
  • cam profile the proportion of an engine cycle measured in crankshaft angle during which the valve remains open
  • the valve event durations could not be optimised for performance over the entire load/speed operating range of the engine and instead the fixed cam profiles were selected to provide an acceptable compromise over the engine operating range.
  • VET variable event timing
  • the geometry of the cams is variable but the cams always rotate at half crankshaft speed.
  • Such mechanisms tend to be complex and expensive.
  • the cams In the second category, to which the mechanisms of the present invention belong, the cams have fixed profile but their phase is cyclically varied as the engine turns so that during each engine cycle the phase is advanced and retarded relative to the crankshaft. In other words, a variable amplitude oscillation is superimposed on the rotation of the cams so as to vary event duration dynamically.
  • the present invention seeks to provide a variable event timing mechanism that is compact, reliable and capable of being fitted to existing engines without the need for major alterations to the engine block or cylinder head.
  • a mechanism for enabling the duration of a valve event in an internal combustion engine to be varied comprising a drive shaft rotatable in synchronism with the engine crankshaft, a cam sleeve rotatably mounted on the drive shaft for opening and closing an engine valve and a drive member coupled to the drive shaft and the cam sleeve, wherein the drive member is mounted for rotation about an axis parallel to that of the drive shaft and the axis of the drive member is variably offset from the drive shaft axis, the extent of the offset serving to vary the phase of the cam sleeve relative to the drive shaft cyclically thereby superimposing a variable amplitude oscillation on the steady rotation of the cam sleeve by the drive shaft to vary the valve event duration, characterised in that the means for coupling the drive member for rotation with the drive shaft includes a pin slidably received in a radial bore in the drive shaft and the end of the pin projecting from the drive shaft is pivot
  • the drive member may be coupled to the cam sleeve by way of a doubly articulated link that is pivotably secured at one end to the drive member and at the other end to the cam sleeve.
  • the drive member may conveniently be connected to a cylindrical ring surrounding the drive shaft and journalled in a block that is mounted for sliding movement towards and away from the surface of the engine to which the pillow blocks supporting the drive shaft bearings are secured.
  • a mechanism for enabling the duration of a valve event in an internal combustion engine to be varied comprising a drive shaft rotatable in synchronism with the engine crankshaft, a rotatably mounted cam sleeve surrounding the drive shaft with clearance and carrying a cam for opening and closing an engine valve, means for coupling the cam sleeve for rotation with the drive shaft, and means for moving the cam sleeve and the drive shaft relative to one another between concentric and eccentric positions, the extent of the offset between the axes of rotation of the cam sleeve and the drive shaft serving to vary the phase of the cam sleeve relative to the drive shaft cyclically thereby superimposing a variable amplitude oscillation on the steady rotation of the cam sleeve by the drive shaft to vary the valve event duration, characterised in that the means for coupling the cam sleeve for rotation with the drive shaft includes a pin slidably received in a radial bore in the
  • the radial pin is slidably received in the drive shaft and the movement of the pin in its bore accommodates the eccentric motion of the drive member or cam sleeve relative to the drive shaft, making it possible to pivot the projecting end of the pin directly on the drive member or cam sleeve.
  • a VET mechanism of a first embodiment of the invention comprises a drive shaft 10 that is driven in the normal manner from the engine. crankshaft.
  • the illustrated mechanism serves to vary event duration and phase in a fixed relationship to one another (as shown in the valve lift diagram of Figure 4) but should it additionally be required to vary the phase of the valve events independently of any change in event duration, then it is possible to incorporate a known phase change mechanism in the pulley driving the drive shaft 10.
  • the VET mechanism comprises a cam sleeve 12 that is fitted over the drive shaft 10 and can rotate freely relative to it.
  • Drive is transmitted from the drive shaft 10 to the cam sleeve 12 by a crescent shaped drive member 14.
  • the drive member 14 is formed integrally with a ring 16 that is journalled in a block 18.
  • the ring 16 surrounds the drive shaft 10 with clearance and can be moved by sliding the block 18 up and down from a position where it is concentric with the drive shaft 10 to eccentric positions.
  • Each end of the crescent of the drive member 14 is bifurcated and receives a pivot pin between its jaws.
  • One of the ends 14a is pivotably connected by a pin 28 to a lollipop-shaped element 20 having a stem which is slidably received in a radial bore 22 in the drive shaft 10.
  • the opposite end 14b of the drive member 14 is connected by way of a link 23 to the cam sleeve 12.
  • the link 23 is doubly articulated, being pivotable about a first pin 24 relative to the drive member 14 and about a second pin 26 relative to the cam sleeve 12.
  • Circlips 30 and 32 received in grooves 34 and 36 on the drive shaft 10 serve to retain the cam sleeve 12 and its drive member 14 axially on the drive shaft 10.
  • the ring 16 By moving the block 18 either up or down from this position, the ring 16 will be forced to rotate about an axis that is vertically offset from the axis of the drive shaft 10. As a result, as the drive member 14 rotates, the distance of the driven end 14a from the centre of the drive shaft centre will vary cyclically during each revolution. Hence the lollipop-shaped element 20 will move in and out of the bore 22 in synchronism with the rotation of the drive shaft 10 causing a rotational oscillation of the drive member 14 around the drive shaft.
  • the opposite end 14b of the drive member 14 connects to the cam sleeve 12 via the doubly articulated link 23 which moves during each revolution to compensate for the drive member 14 and cam sleeve 12 having different centres of rotation.
  • This motion causes a further rotational oscillation of the cam sleeve 12 relative to the drive member 14 which superimposes upon the oscillation of the drive member 14 around the drive shaft 10 such that the phase of the cam sleeve is varied cyclically as the drive shaft rotates.
  • This will result in the curves 100 and 114 at the extreme of adjustment of the block 18 in one direction and in the curves 104 and 110 at the extreme of adjustment in the opposite direction.
  • the various blocks 18 for the different valves must all be movable in synchronism with one another and this can be achieved by mounting each block 18 on pins 40 that extend vertically from the cylinder head, i.e. from the face of the cylinder head on which the pillow blocks supporting the drive shaft bearings are mounted. Eccentrics 50 received in the bores 42 in the blocks 18 can be rotated in unison to raise and lower all the blocks 18 simultaneously by the same amount.
  • one of the guide pins 40 may be formed with a bore 42 that communicates with an oil gallery 44 in the cylinder head. Further bores 46 in the block 18 connected to the bore 42 serve to guide the oil to the bearing surface of the ring 16, to the eccentric 50 and to the outer surfaces of the guide pins 40.
  • the drive shaft 10 and the cam sleeve 12 are always concentric and they are coupled to one another by an intermediate drive member 14 that can be moved to an eccentric position.
  • the intermediate drive member is omitted and instead the drive shaft 110 can be moved to an eccentric position relative to the cam sleeve 112.
  • all the embodiments operate in any analogous manner to one another.
  • inventions of Figures 5 to 7 also have in common with the embodiment of Figures 1 to 3, the fact that the coupling between the drive shaft 110 and the cam sleeve includes a pin slidably received in a radial bore in the drive shaft 110 and the fact that all the coupling forces acts in the same plane normal to the axis of rotation of the mechanism.
  • the bearing blocks that support the drive shaft may furthermore be constructed in a similar manner to the blocks 18.
  • a pin 220 is slidably received in a radial bore 122 in the drive shaft 110 the pin 220 having a tangentially extending arm 223.
  • a single pivot pin 224 connects the arm 223 to the cam sleeve 112. The slidable pin 220 reciprocates radially within the bore 122 as the mechanism rotates.
  • the slidable pin 320 has a cylindrical head 324 of which the axis lies parallel to the axis of rotation of the mechanism.
  • the head 324 is received in a block 326 that is a force fit in a bore 328 in the cam sleeve 112.
  • the pin 320 needs to move in the bore 122 to take up the eccentricity.
  • the pin 420 again has a part cylindrical head 424 but this is received in a cap 426 that is retained in a cut-out 432 in the cam sleeve 112 by a clamping band 430.
  • the head 424 of the pin 420 cannot move radially in relation to the cam sleeve 112 and the pin 420 must once again reciprocate within the bore 122 in the drive shaft 110.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP20010000338 2000-08-08 2001-08-02 Distribution variable Expired - Lifetime EP1179657B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0019325 2000-08-08
GB0019325A GB2365508A (en) 2000-08-08 2000-08-08 Variable valve timing mechanism

Publications (2)

Publication Number Publication Date
EP1179657A1 true EP1179657A1 (fr) 2002-02-13
EP1179657B1 EP1179657B1 (fr) 2006-06-21

Family

ID=9897107

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20010000338 Expired - Lifetime EP1179657B1 (fr) 2000-08-08 2001-08-02 Distribution variable
EP01000345A Expired - Lifetime EP1234955B1 (fr) 2000-08-08 2001-08-02 Dispositif de distribution variable

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP01000345A Expired - Lifetime EP1234955B1 (fr) 2000-08-08 2001-08-02 Dispositif de distribution variable

Country Status (3)

Country Link
EP (2) EP1179657B1 (fr)
DE (2) DE60125321T2 (fr)
GB (1) GB2365508A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006097767A1 (fr) * 2005-03-18 2006-09-21 Mechadyne Plc Ensemble d'arbre a cames
DE102013215560A1 (de) * 2013-08-07 2015-02-12 Mahle International Gmbh Variable Nockenwelle

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012008219B4 (de) * 2012-04-25 2019-05-16 Audi Ag Ventiltrieb einer Brennkraftmaschine
DE102016201264A1 (de) * 2016-01-28 2017-08-03 Mahle International Gmbh Betriebsverfahren
JP2021071049A (ja) * 2018-02-28 2021-05-06 日立Astemo株式会社 内燃機関のバルブタイミング制御装置
GB202005068D0 (en) * 2020-04-06 2020-05-20 Pattakos Manousos Continous variable valve duration apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0801213A1 (fr) * 1996-04-10 1997-10-15 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Actionneur hydraulique et son application à un mécanisme de commande variable des soupapes
US5787849A (en) * 1995-11-21 1998-08-04 Mitchell; Stephen W. Valve timing phase changer
US5979381A (en) * 1995-12-12 1999-11-09 Korostenski; Erwin Valve gear mechanism for an internal combustion engine

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2066361B (en) * 1980-01-02 1984-07-11 Nat Res Dev Valve timing mechanisms of internal combustion engines
GB2165885B (en) * 1984-10-20 1987-12-23 Austin Rover Group I c engine variable valve timing mechanism
GB2252130B (en) * 1989-10-13 1994-03-30 Rover Group An internal combustion engine camshaft drive mechanism
GB9021270D0 (en) * 1990-10-01 1990-11-14 Mitchell Stephen W Improvements in or relating to driving connections between two rotatable bodies
JP3177532B2 (ja) * 1992-01-27 2001-06-18 株式会社ユニシアジェックス 内燃機関の吸排気弁駆動制御装置
DE4220668C1 (de) * 1992-06-24 1993-12-09 Daimler Benz Ag Betätigungsvorrichtung für eine Stellklappe in Kraftfahrzeugen
DE4413406C2 (de) * 1994-04-18 1999-05-06 Korostenski Erwin Brennkraftmaschine mit variabler Ventilsteuerung
DE4419557C1 (de) * 1994-06-03 1995-10-19 Korostenski Erwin Brennkraftmaschine mit variabler Ventilsteuerung
DE59502370D1 (de) * 1994-12-13 1998-07-02 Erwin Korostenski Ventiltrieb einer brennkraftmaschine
JPH08240109A (ja) * 1995-03-03 1996-09-17 Unisia Jecs Corp 内燃機関の吸排気弁駆動制御装置
AU7617696A (en) * 1995-08-19 1997-03-12 Erwin Korostenski Internal combustion engine and process for operating the valve gear mechanism of an internal combustion engine
DE19643160A1 (de) * 1995-10-18 1997-04-24 Unisia Jecs Corp Phasenverstellmechanismus für die Nockenwelle eines Verbrennungsmotors
JP3899576B2 (ja) * 1997-02-07 2007-03-28 三菱自動車工業株式会社 可変動弁機構及び可変動弁機構付き内燃機関

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5787849A (en) * 1995-11-21 1998-08-04 Mitchell; Stephen W. Valve timing phase changer
US5979381A (en) * 1995-12-12 1999-11-09 Korostenski; Erwin Valve gear mechanism for an internal combustion engine
EP0801213A1 (fr) * 1996-04-10 1997-10-15 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Actionneur hydraulique et son application à un mécanisme de commande variable des soupapes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006097767A1 (fr) * 2005-03-18 2006-09-21 Mechadyne Plc Ensemble d'arbre a cames
US7958859B2 (en) 2005-03-18 2011-06-14 Mechadyne Plc Camshaft assembly
DE102013215560A1 (de) * 2013-08-07 2015-02-12 Mahle International Gmbh Variable Nockenwelle

Also Published As

Publication number Publication date
EP1234955B1 (fr) 2006-12-20
GB0019325D0 (en) 2000-09-27
DE60125321T2 (de) 2007-07-05
GB2365508A (en) 2002-02-20
DE60120852T2 (de) 2007-01-11
DE60120852D1 (de) 2006-08-03
EP1234955A1 (fr) 2002-08-28
EP1179657B1 (fr) 2006-06-21
DE60125321D1 (de) 2007-02-01

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