EP1722076B1 - Entraînement de soupapes pour moteur à combustion interne - Google Patents

Entraînement de soupapes pour moteur à combustion interne Download PDF

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Publication number
EP1722076B1
EP1722076B1 EP20060005932 EP06005932A EP1722076B1 EP 1722076 B1 EP1722076 B1 EP 1722076B1 EP 20060005932 EP20060005932 EP 20060005932 EP 06005932 A EP06005932 A EP 06005932A EP 1722076 B1 EP1722076 B1 EP 1722076B1
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EP
European Patent Office
Prior art keywords
valve
gas exchange
valve drive
support element
spring
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.)
Active
Application number
EP20060005932
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German (de)
English (en)
Other versions
EP1722076A1 (fr
Inventor
Gert Fischer
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.)
Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication date
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Publication of EP1722076A1 publication Critical patent/EP1722076A1/fr
Application granted granted 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio

Definitions

  • the invention relates to a valve train for an internal combustion engine with the features of the preamble of patent claim 1.
  • a fixing device is provided, with which the support element is fixed in position in a first position, corresponding to a maximum valve lift of the gas exchange valve, wherein a stop in the pressure chamber of the support element is provided, with which the unfixed support element is positionally fixed in a second position.
  • a disadvantage of the described embodiment is the very complicated to be manufactured adjusting mechanism for the variable-stroke valve drive of the internal combustion engine, and the high forces acting on the locking mechanism.
  • Object of the present invention is to show a measure of how the structural complexity and at the same time the forces occurring in a generic valve train for Ventilhubsver ein can be significantly reduced.
  • VANOS camshaft turning device
  • the intake gas exchange valves may have different strokes (maximum lift (X) and mini lift (Y)) to increase charge and swirl in the combustion chamber in the medium speed range.
  • the short opening of the mini-lift gas exchange valve ie a valve lift less than 2 mm (Y), prevents a larger HC output (hydrocarbon discharge), since no fuel can accumulate on it as with a completely closed intake gas changeover valve.
  • the valve train according to the invention requires no special manufacturing tolerances in the mini stroke, since the Hubetzels the rotating cam very well, the opening and closing time very precise and the mini stroke (Y) is very easy to adjust from the outside when needed, which is especially in idle and idle close range of the engine a good synchronization with low speed fluctuations is achieved.
  • the valve train according to the invention can also be used for Auslassgas crispventile.
  • a preferred embodiment of the clearance compensation element is the use of a hydraulic clearance compensation element.
  • the intermediate element is preferably a tilting or drag lever, particularly preferably with a roller.
  • the valve train 1 has a camshaft 2 with a cam 2 ', which is in operative connection with a roller 4' of an intermediate element 4.
  • the intermediate element 4 is a drag lever, which may also be a rocker arm in another embodiment.
  • the intermediate element 4 rests on the one hand on a valve stem end 3 'of a gas exchange valve 3 and on the other hand on a support element 6.
  • a spring element 7 is arranged, which presses the support element 6 together with the intermediate element 4 in the direction of the camshaft 2.
  • the support element 6 is held by a fixing device 9 in a defined position. In this position, the gas exchange valve 3 is opened upon actuation of the valve train 1 by the cam 2 'with a maximum stroke (X) against a spring force of a valve spring 5.
  • Fig. 2 in which the same reference numerals for the same components as in Fig. 1 apply, the same valve train for the internal combustion engine is shown again, but with an unlocked support 6.
  • the support element 6 is now on the stop 10 and the gas exchange valve 3 has a mini stroke (Y) of a maximum of 2 mm due to the changed ratio.
  • a very simple, extremely low-cost variability in the valve train 1 can be realized without the relevant mass for high speeds in the valve train 1 increase.
  • the installation space in the cylinder head 8 is neither increased in comparison to a cylinder head without this variability, nor is a noticeable increase in weight ascertainable, since neither additional adjusting motors, additional control shafts or the like are required.
  • a camshaft twisting device VANOS can be combined with the valve drive 1 according to the invention.
  • the opening angles of the intake gas exchange valves required for higher speeds and higher power can be increased to a certain extent.
  • the intake gas exchange valves 3 may also have different strokes, maximum lift (X) and mini lift (Y), in order to increase filling and swirl in the combustion chamber in the middle speed range.
  • X maximum lift
  • Y mini lift
  • the short opening of the mini-lift gas exchange valve prevents a larger HC emissions (hydrocarbon emissions), since no fuel, as in a completely closed inlet gas exchange valve, can attach to this.
  • valve gear 1 according to the invention requires in the Minihub Scheme (Y) no special manufacturing tolerances, since the Hubaufels the rotating cam very well, the opening and closing time very precise and the Minihub (Y) is very easy to adjust from the outside if necessary, which is particularly idle and idle region of the engine good synchronization with low speed fluctuations is achieved.
  • the valve gear 1 according to the invention can also be used for Auslassgas strigventile.
  • the cam 2 ' actuates a gas exchange valve 3, wherein the support member 6 has a fixing device 9, which causes the usual full stroke (X) of the gas exchange valve in the blocked state.
  • the support member 6 takes on the cam lift such that the gas exchange valve 3 initially remains closed.
  • the valve drive 1 runs against a fixed, advantageously also adjustable stop 10, so that the gas exchange valve 3 now has to compulsively open a mini-stroke (Y).
  • a gas exchange valve speed assumes values that move in the ramp range of conventional valve trains and also the mini-stroke (Y) is driven only in the lower speed range.
  • Y mini-stroke
  • no higher opening and closing speeds of the gas exchange valve 3 are achieved than in a conventional valve train.
  • the stop 10 can also be provided with an oil damping.
  • the gas exchange valve speed is plotted against the cam angle.
  • the gas exchange valve speed curve corresponds to an opening of the gas exchange valve 3 for a maximum lift (X).
  • the opening stroke of the gas exchange valve 3 begins in the coordinate 0, 0 with a ramp region, which is predetermined by a contour of the cam 2 ', as used in valve trains without hydraulic clearance compensation.
  • the region of the maximum gas exchange valve speed adjoins the ramp region in accordance with the further gas exchange valve opening stroke.
  • the gas exchange valve speed is reached 0 m / s, after the zero crossing, which is designated with the cam tip, closes the gas exchange valve 3 again.
  • the hatching area shown hatched in which the valve train 1 can be switched to the mini-stroke (Y).
  • a clearance compensation element preferably a hydraulic clearance compensation element is integrated into the support element 6.
  • the position fixing according to the invention can also be used when the valve train has no intermediate element.
  • An example of this is a valve train with a valve cup, which below the bottom to the valve stem an element, for example, instead of a hydraulic lash adjuster, includes having a corresponding locking device.
  • the operation of the locking device is slightly more difficult, the oscillating mass increases slightly and the space slightly increased, in this embodiment, the insects 4 and the support member 6 would be represented together by the valve cup.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (5)

  1. Entraînement de soupape (1) d'un moteur à combustion interne avec un arbre à came (2) dont la came (2') actionne une soupape d'échange de gaz (3) indirectement par un élément intermédiaire (4) contre la force d'un ressort de soupape (5),
    l'élément intermédiaire (4) étant appuyé contre l'extrémité (3') de la tige de la soupape d'échange de gaz (3) ainsi que contre un élément d'appui (6),
    l'élément d'appui (6) étant appuyé par une force d'un élément de ressort (7) contre la culasse (8), et la force de l'élément de ressort (7) étant inférieure à la force du ressort de soupape (5), et avec un dispositif de blocage (9) prévu pour bloquer l'élément d'appui (6) dans une première position en fonction d'une course de soupape maximale (X) de la soupape d'échange de gaz (3),
    une butée (10) étant prévue pour l'élément d'appui (6) et permettant de bloquer l'élément d'appui (6) non bloqué dans une seconde position,
    caractérisé en ce que
    la seconde position correspond à une course (Y) de la soupape d'échange de gaz (3) inférieure à 2 mm, et
    la position de la butée (10) dans la direction axiale de l'élément d'appui (6) est variable.
  2. Entraînement de soupape selon la revendication 1,
    caractérisé en ce qu'
    un élément de compensation de jeu est intégré à l'élément d'appui (6).
  3. Entraînement de soupape selon la revendication 1,
    caractérisé en ce que
    l'élément d'appui (6) est un élément de compensation de jeu.
  4. Entraînement de soupape selon la revendication 2 ou 3,
    caractérisé en ce que
    l'élément de compensation de jeu est un élément de compensation de jeu hydraulique.
  5. Entraînement de soupape selon l'une des revendications 1 à 4,
    caractérisé en ce que
    l'élément intermédiaire (4) est un culbuteur ou un levier traîné.
EP20060005932 2005-05-03 2006-03-23 Entraînement de soupapes pour moteur à combustion interne Active EP1722076B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510020586 DE102005020586A1 (de) 2005-05-03 2005-05-03 Ventiltrieb für eine Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1722076A1 EP1722076A1 (fr) 2006-11-15
EP1722076B1 true EP1722076B1 (fr) 2008-05-07

Family

ID=37027891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060005932 Active EP1722076B1 (fr) 2005-05-03 2006-03-23 Entraînement de soupapes pour moteur à combustion interne

Country Status (2)

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EP (1) EP1722076B1 (fr)
DE (2) DE102005020586A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014201083A1 (de) * 2014-01-22 2015-07-23 Bayerische Motoren Werke Aktiengesellschaft Variables Ändern einer Ventilöffnungszeit eines Ladungswechselventils

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53123310U (fr) * 1977-03-09 1978-09-30
DE4134657A1 (de) * 1991-10-19 1992-09-17 Daimler Benz Ag Ventilsteuerung
DE4211631A1 (de) * 1992-04-07 1993-04-08 Bayerische Motoren Werke Ag Ventiltrieb mit einem laengsverschiebbaren spielausgleichselement
DE4318293A1 (de) * 1992-06-13 1993-12-16 Volkswagen Ag Schlepphebel-Ventiltrieb für ein Hubventil
DE4323555A1 (de) * 1993-07-14 1995-01-19 Bayerische Motoren Werke Ag Vorrichtung zum Außerbetriebsetzen eines Brennkraftmaschinen-Hubventils
JP3865771B2 (ja) * 1994-05-03 2007-01-10 ロータス カーズ リミテッド バルブ制御機構
GB9612178D0 (en) * 1996-06-11 1996-08-14 Ricardo Consulating Engineers Hydraulic tappets
DE19825308A1 (de) 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Variabler Ventiltrieb für eine Brennkraftmaschine
DE19837098A1 (de) * 1998-08-17 2000-02-24 Porsche Ag Verfahren zum Betrieb einer mehrzylindrigen Brennkraftmaschine und Ventiltrieb einer mehrzylindrigen Brennkraftmaschine
US6837197B2 (en) * 2003-03-19 2005-01-04 Eaton Corporation Dual valve lift and valve deactivation
US6832583B2 (en) * 2003-05-16 2004-12-21 General Motors Corporation Direct acting differential two-step valve train
EP1493902A1 (fr) * 2003-06-30 2005-01-05 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Dispositif pour désactiver une soupape

Also Published As

Publication number Publication date
DE502006000726D1 (de) 2008-06-19
EP1722076A1 (fr) 2006-11-15
DE102005020586A1 (de) 2006-11-09

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