EP1760276A1 - Mécanisme de commande de soupape - Google Patents

Mécanisme de commande de soupape Download PDF

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Publication number
EP1760276A1
EP1760276A1 EP06010788A EP06010788A EP1760276A1 EP 1760276 A1 EP1760276 A1 EP 1760276A1 EP 06010788 A EP06010788 A EP 06010788A EP 06010788 A EP06010788 A EP 06010788A EP 1760276 A1 EP1760276 A1 EP 1760276A1
Authority
EP
European Patent Office
Prior art keywords
valve
cam
movable support
coupling point
fixing bolt
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
EP06010788A
Other languages
German (de)
English (en)
Other versions
EP1760276B1 (fr
Inventor
Dietmar Schwarzenthal
Joachim Grünberger
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche 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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP1760276A1 publication Critical patent/EP1760276A1/fr
Application granted granted Critical
Publication of EP1760276B1 publication Critical patent/EP1760276B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/30—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of positively opened and closed valves, i.e. desmodromic valves

Definitions

  • the invention relates to a valve drive for controlling the opening and closing movement of at least one valve device, which is biased by a valve closing spring means in a closed position, with a driven cam means which is coupled via a lever means with the valve means.
  • valve closing movement is effected by a valve closing spring means, by which the valve means is biased in its closed position.
  • a valve closing spring means by which the valve means is biased in its closed position.
  • desmodromic valve trains both the opening and the closing movement is effected, for example, by different cam contours on one or more cam elements.
  • the object of the invention is to provide a valve train according to the preamble of claim 1, which has a good closing behavior even at high speeds.
  • a valve drive for controlling the opening and closing movement of at least one valve device, which is biased by a valve closing spring device into a closed position, with a driven cam device, which is coupled via a lever device with the valve device, characterized in that the cam device is a first Cam contour, which abuts in a first operating position of the cam device between a first coupling point and a second coupling point on a cam follower to control only the opening movement of the valve means, and a second cam contour, in a second operating position of the cam device together with the first cam contour or controls with a further cam contour both the opening movement and the closing movement of the valve device via the cam follower, which at the first Coupling point is coupled to the valve device and at the second coupling point with an adjusting device, by means of which the position of the second coupling point is variably fixable.
  • the valve clearance is adjusted, for example, by means of calibrated annular disks which, fitted on the valve, maintain the positive connection between the valve and the lever device.
  • the adjusting device according to the invention enables automatic valve clearance adjustment during operation.
  • a first operating state of the valve train which is defined by low rotational speeds of an associated internal combustion engine
  • the cam device In a second operating state of the valve train, which is defined by high rotational speeds of the associated internal combustion engine, the cam device is in its second operating position.
  • the valve train according to the invention operates in the first operating state up to an average rotational speed like a conventional valve train. This ensures low-noise operation at low speeds.
  • the valve device is forcibly controlled by the two cam contours on the drag lever. This ensures high rigidity at high speeds.
  • a preferred embodiment of the valve train is characterized in that the adjusting device comprises a movable support element which acts on the drag lever in the first operating state of the valve train against the valve closing spring device. This eliminates unwanted valve clearance.
  • a further preferred embodiment of the valve train is characterized in that the movable support element cooperates with a fixing device, by means of which the movable support element is fixed in its position in the second operating state of the valve train.
  • the valve device In the second operating state of the valve drive, the valve device is not only opened by the drag lever, but also forcibly closed by the drag lever.
  • the movable support element By fixing the movable support element, a correct closing of the valve device is ensured even in the second operating state.
  • a further preferred exemplary embodiment of the valve drive is characterized in that the movable support element has a form-fitting section with a plurality of form-fitting regions into which a positive-locking element engages in the second operating state of the valve drive in order to fix the movable support element.
  • the movable supporting element can move in order to compensate for the valve clearance.
  • a further preferred embodiment of the valve drive is characterized in that the form-fitting section has a toothing.
  • the length of the form-locking section results from the anticipated size of the expected valve clearance.
  • a further preferred embodiment of the valve drive is characterized in that the positive-locking element is formed by a tip of a fixing bolt.
  • the tip of the fixing bolt is preferably formed partially complementary to the toothing.
  • valve drive is characterized in that the fixing bolt is acted upon on its side facing away from the tip with the pressure of a hydraulic medium.
  • the hydraulic medium is preferably oil whose pressure increases with the speed of the associated internal combustion engine.
  • a further preferred embodiment of the valve drive is characterized in that the fixing bolt is biased by a spring means of the positive connection portion away. As soon as the pressure of the hydraulic medium exceeds the biasing force of the spring device, the tip of the fixing bolt is brought into engagement with the form-fitting section.
  • the enclosed figure shows a valve train 1 of an internal combustion engine, in particular of a motor vehicle engine.
  • the valve train 1 serves to control the opening and closing movement of a valve 4.
  • the valve 4 has a valve plate 6, which serves to close a (not shown) opening in a working space of the internal combustion engine and release targeted.
  • the closing movement movement direction of the valve disk 6 is indicated by an arrow 9.
  • the opening movement direction of the valve disk 6 is indicated by an arrow 10.
  • the valve disk 6 is integrally connected to a valve stem 8.
  • the valve stem 8 is guided back and forth in the longitudinal direction.
  • the collar 11 is biased against a valve closing spring 14, that the valve 4 is closed by the valve closing spring 14.
  • the leagues 11, 12 point to each other facing end faces in each case a contact surface.
  • the two contact surfaces are spaced apart.
  • a coupling element 18 is arranged between the two contact surfaces of the collars 11, 12.
  • the coupling element 18 has the shape of a disc which is provided at one end of a lever device 20.
  • the lever device 20 comprises a drag lever 21, at one end of which the coupling element 18 is formed.
  • the coupling element 18 forms a first coupling point 19 of the drag lever 21, on which the drag lever 21 is coupled to the valve 4.
  • the other end 22 of the finger lever 21 is coupled at a second coupling point 23 with a movable support member 25.
  • the movable support element 25 comprises a hydraulic element 27, which is also referred to as a hydroelement and protrudes at the second coupling point 23 remote from the end 26 of the movable support member 25 out of this.
  • the free end of the hydraulic element 27 is supported on a housing 28 of a total of 29 designated adjusting device.
  • a arrow 30 is indicated that the housing 28 of the adjusting device 29 is filled with a hydraulic medium.
  • a head 34 of a fixing bolt 35 is acted upon, which is guided in its longitudinal direction reciprocally movable in the housing 28.
  • a tip 38 is formed, which forms a positive locking element.
  • a toothed portion 40 having a plurality of teeth is formed on the movable support member 25. The shape and size of the teeth are selected so that the tip 38 of the fixing bolt 35 can engage between two teeth to fix the movable supporting member 25 reciprocally movable in the housing 28 in its longitudinal direction.
  • the fixing bolt 35 engages a spring 44, through which the head 34 of the fixing bolt 35 is biased away from the toothed portion 40.
  • the biasing force of the spring 44 serves to the tip 38 of the fixing bolt 35 at low speeds of the associated internal combustion engine at a distance from the To keep toothing section 40.
  • the rotational speed of the associated internal combustion engine increases, so does the pressure of the hydraulic medium in the housing 28 on the fixing bolt head 34.
  • the fixing bolt 35 moves with the tip 38 to the toothed portion 40 until the tip 38 engages the toothed portion 40.
  • the support member 25 is fixed in the housing 28.
  • the second coupling point 23 formed at one end of the support element 25 is likewise fixed.
  • a cam member 50 is arranged, which is driven by a (not shown) camshaft.
  • the cam member 50 includes an inner cam contour 54 which abuts the drag lever 21 between the two coupling points. Up to a medium speed, the valve train 1 operates like a conventional valve train.
  • the inner cam contour 54 of the cam element 50 bears against the drag lever 21.
  • the hydraulic element 27 with the support member 25 presses on the drag lever 21 against the valve closing spring 14. This eliminates a game between the coupling element 18 and the collar 11.
  • the valve 4 is forcibly controlled by the camshaft via the cam member 50 via the cam follower 21.
  • the cam member 50 on an outer cam contour 55, which is also coupled by means of a coupling element 66 with the cam follower 21. This ensures that not only the opening movement but also the closing movement of the valve 4 is forcibly controlled by the cam element 50. In this case, tensile forces occur on the support element 25, which would lead to inflating in conventional support elements. The valve 4 would then no longer close properly.
  • the support member 25 is mechanically in its present position by the speed-increasing oil pressure in the housing 28 acting on the head 34 of the locating pin 35 fixed when the tip 38 of the fixing bolt 35 engages with the toothed portion 40 on the support member 25.
  • the support element 25 acts as a mechanically adjustable support element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP20060010788 2005-09-03 2006-05-26 Mécanisme de commande de soupape Expired - Fee Related EP1760276B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005041900A DE102005041900A1 (de) 2005-09-03 2005-09-03 Ventiltrieb

Publications (2)

Publication Number Publication Date
EP1760276A1 true EP1760276A1 (fr) 2007-03-07
EP1760276B1 EP1760276B1 (fr) 2009-04-29

Family

ID=37492082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060010788 Expired - Fee Related EP1760276B1 (fr) 2005-09-03 2006-05-26 Mécanisme de commande de soupape

Country Status (2)

Country Link
EP (1) EP1760276B1 (fr)
DE (2) DE102005041900A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101225759B (zh) * 2008-01-25 2010-06-09 许小法 可变气门升程装置
DE102009012597A1 (de) 2009-03-11 2010-09-16 Inventus Engineering Gmbh Desmodromischer Ventiltrieb

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02221612A (ja) * 1989-02-22 1990-09-04 Nissan Motor Co Ltd 内燃機関の可変動弁装置
DE29724377U1 (de) * 1996-12-11 2000-12-28 Battlogg Stefan Ventiltrieb
WO2003040526A1 (fr) * 2001-11-06 2003-05-15 Thyssenkrupp Automotive Ag Dispositif de commande variable de soupape de levage
WO2003040525A1 (fr) * 2001-10-17 2003-05-15 Geoffrey Oswald Nevin Mecanisme d'entrainement de soupape a cames a rainures pour moteurs a combustion interne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63297709A (ja) * 1987-05-28 1988-12-05 Fuji Heavy Ind Ltd 内燃機関のバルブクリアランス調整装置
JPH0350307A (ja) * 1989-07-17 1991-03-04 Nissan Motor Co Ltd 内燃機関の弁強制開閉装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02221612A (ja) * 1989-02-22 1990-09-04 Nissan Motor Co Ltd 内燃機関の可変動弁装置
DE29724377U1 (de) * 1996-12-11 2000-12-28 Battlogg Stefan Ventiltrieb
WO2003040525A1 (fr) * 2001-10-17 2003-05-15 Geoffrey Oswald Nevin Mecanisme d'entrainement de soupape a cames a rainures pour moteurs a combustion interne
WO2003040526A1 (fr) * 2001-11-06 2003-05-15 Thyssenkrupp Automotive Ag Dispositif de commande variable de soupape de levage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101225759B (zh) * 2008-01-25 2010-06-09 许小法 可变气门升程装置
DE102009012597A1 (de) 2009-03-11 2010-09-16 Inventus Engineering Gmbh Desmodromischer Ventiltrieb

Also Published As

Publication number Publication date
EP1760276B1 (fr) 2009-04-29
DE502006003587D1 (de) 2009-06-10
DE102005041900A1 (de) 2007-03-15

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