EP1380728B1 - Dispositif de commande de soupape - Google Patents

Dispositif de commande de soupape Download PDF

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Publication number
EP1380728B1
EP1380728B1 EP20020450157 EP02450157A EP1380728B1 EP 1380728 B1 EP1380728 B1 EP 1380728B1 EP 20020450157 EP20020450157 EP 20020450157 EP 02450157 A EP02450157 A EP 02450157A EP 1380728 B1 EP1380728 B1 EP 1380728B1
Authority
EP
European Patent Office
Prior art keywords
valve
stroke
lift device
transmission member
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.)
Expired - Lifetime
Application number
EP20020450157
Other languages
German (de)
English (en)
Other versions
EP1380728A1 (fr
Inventor
Christian Dipl.-Ing. Seltenhammer
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
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 AVL List GmbH filed Critical AVL List GmbH
Priority to EP20020450157 priority Critical patent/EP1380728B1/fr
Priority to DE50202718T priority patent/DE50202718D1/de
Publication of EP1380728A1 publication Critical patent/EP1380728A1/fr
Application granted granted Critical
Publication of EP1380728B1 publication Critical patent/EP1380728B1/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
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating 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
    • 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
    • F01L13/0031—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 tappet or pushrod length

Definitions

  • the invention relates to a valve drive device for at least one lift valve for an internal combustion engine, wherein the stroke of the lifting valve variably adjustable is, with a camshaft with at least one cam, which on a valve stem the lifting valve in the opening direction against a preferably by a closing force acting on a first valve spring acts.
  • valve train mechanisms are known, with which the valve lift a gas exchange valve of an internal combustion engine can be changed.
  • US 5,365,895 A discloses a variable valve lift mechanism for a Internal combustion engine, in which by changing the position of the lever axis variable valve lift is achieved. Also in the US 4,714,057 A, the US 4,724,822 A, US 4,986,227 A, US 4,638,773 A, US 4,397,270 A or the US 3,413,965 A, the change of the valve lift is done by changing the axis of rotation of the valve operating lever.
  • the disadvantage is that in the most cases a relatively space-consuming and many-part existing Adjustment mechanism for the axis of rotation must be provided.
  • Object of the present invention is to simplify a simple way space-saving and consisting of a few parts variable valve train device to accomplish.
  • an elastic transmission member is arranged in the effective path between the cam and valve stem and that a adjustable stroke limiting element is provided, against the opening force of the cam on the valve stem or the transmission member act can, wherein in at least one activation position, the Hubbegrenzungselement the opening stroke of the lifting valve under elastic deformation of the transmission member limited to a predefined value.
  • the elastic transmission member has a preferably formed by a compression spring second valve spring with a greater spring stiffness than the first valve spring on.
  • the stroke limiting device can be used as a slide, as a one-armed or as a two-armed Lever be formed.
  • an activation device preferably formed by an eccentric acting on the Hubbegrenzungselement in the sense of a stroke limitation.
  • the Hubbegrenzungselement By simply turning the eccentric, the Hubbegrenzungselement is in an activation position brought in which it from a certain valve lift further opening of the lift valve limited.
  • the Hubbegrenzungselement a preferably having sleeve-shaped stop member, which in at least one activation position on the valve stem or on the transfer member the opening direction of the lifting valve acts in the sense of a stroke limitation.
  • the Hubbegrenzungselement has a damping body, which preferably is arranged between the stop member and the slider or lever.
  • the Damping body may preferably by at least one plate spring be formed.
  • the valve drive device 1 for at least one lift valve 2 of an internal combustion engine has a camshaft 3 with at least one cam 4, which via an elastic transmission member 5 on the valve stem 6 of the lift valve. 2 acts in the opening direction against the closing force of a first valve spring 7.
  • the transmission member 5 has within two cup-like pistons 8, 9 a second valve spring 20, which is designed as a compression spring and the two Piston 8, 9 presses apart.
  • the first piston 8 is in a guide cylinder 10 of the cylinder housing 11, the second piston 9 within the first Piston 8 slidably mounted, wherein the second piston 9 by a locking ring 12 is held within the first piston 8.
  • a Hubbegrenzungselement 13 is provided, which in the activated state in the embodiments acting on the second piston 9 against the opening movement. It is also conceivable that the Hubbegrenzungselement 13 directly to the Valve stem 6 acts.
  • the Hubbegrenzungselement 13 has in the contact area with the elastic Transmission member 5 a formed by a sleeve or the like stop member 14, which in a recess 15 - for example, a bore or a slot - the Hubbegrenzungsiatas 13 is arranged.
  • the stopper part 14 is formed as a hollow body or as a cross-sectionally U-shaped body and at least partially surrounds the valve stem 6.
  • On the transfer member facing side of Hubbegrenzungs institutes 13 is between the Hubbegrenzungselement 13 and the stop member 14 a through two disc springs 16 formed damping part arranged. This damping part prevents too hard impact of the stop member 14 on the second piston 9 of the transmission member 5th
  • Fig. 3 shows an embodiment, in the stroke limiting element 13 is formed by a one-armed lever 13b is.
  • the actuator 18 is on the valve disc 2a of the lift valve 2 facing side of Hubbegrenzungsiatas 13 arranged.
  • Lever 13a, 13b must be listed very rigid in any case.
  • Fig. 4 shows a third embodiment in which the Hubbegrenzungselement 13 is also designed as a one-armed lever 13c.
  • the eccentric 17 of the actuator 18 engages in a connecting rod 19 of the one-armed lever 13c one.
  • Fig. 1 shows the valve drive device 1 with deactivated Hubbegrenzungselement 13.
  • the eccentric 17 is in its rest position.
  • the cam 4 of the camshaft 3 acts via the elastic transmission member 5 on the valve stem 6 on. Since the second valve spring 20 with much greater spring stiffness is formed as the first valve spring 7, is - with deactivated Hubbegrenzungselement 13 - the second valve spring 20 is not deflected, so that the by the cam 4 predetermined maximum valve lift unimpeded on the Lift valve 2 is transmitted.
  • valve 26 denotes the only partially shown cylinder head of the internal combustion engine, in which a valve seat ring 27 is arranged, with the valve disc 2a interacts.
  • Fig. 2 shows the valve drive device 1 with activated Hubbegrenzungselement 13.
  • the eccentric 17 is rotated in an activation position, so that the lever 13a is deflected by a distance he.
  • the stop member 14 is thereby pressed in the direction of the transmission member 5.
  • the cam 4 of the camshaft 3 simultaneously acts on the first piston 8 and shifts it by a distance h n . Since the second piston 9 is prevented from further deflecting by the abutment part 14 of the stroke limiting element 13, the second valve spring 20 is compressed and the lifting movement according to the cam 4 is at least partially absorbed by the transmission member 5.
  • the actual valve lift h v thus corresponds to the instantaneous cam lift h n as long as it is smaller than the travel h 0 - h e / x which is released by the stroke limiting element 13.
  • valve lift h is plotted against the crank angle KW.
  • the solid line 30 shows the valve lift when not activated Hubbegrenzungselement 13.
  • With broken lines 31, 32, 33 is the course the valve lift h shown when Hubbegrenzungselement 13 moderately, medium or strongly activated.
  • FIG. 6 corresponds to that of FIG. 5 with the difference that with 30a and 30b the valve lift h for a by a rotation of the camshaft 3 effected adjustment of the phase position in the sense of the double arrow 34 shown is.
  • the levels of lines 31, 32, and 33 are not changed thereby.
  • the described valve drive device 1 allows for very space-saving and easy way with very few items a variable valve lift limit.

Landscapes

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

Claims (9)

  1. Installation de commande de soupape (1) pour au moins une soupape (2) d'un moteur à combustion interne, la course de la soupape (2) étant réglable de manière variable, l'installation comprenant
    un arbre à came (3) comportant au moins une came (4) agissant sur la tige (6) de la soupape (2) dans le sens de l'ouverture contre la force de fermeture développée de préférence par un premier ressort de soupape (7),
    un élément de transmission élastique (5) se trouvant dans le chemin de coopération entre la came (4) et la tige de soupape (6)
    caractérisée par
    un élément réglable de limitation de course (13) qui peut agir contre la force d'ouverture de la came (4) sur la tige (6) de la soupape ou sur l'organe de transmission (5),
    et dans au moins une position active de l'élément de limitation de course (13), il limite la course d'ouverture de la soupape (2) à une valeur prédéfinie par changement de forme élastique de l'organe de transmission (5).
  2. Installation de commande de soupape (1) selon la revendication 1,
    caractérisée en ce que
    l'organe de transmission comporte un second ressort de soupape (20) notamment un ressort de compression dont la dureté est plus grande que celle du premier ressort de soupape (7).
  3. Installation de commande de soupape (1) selon la revendication 1 ou 2,
    caractérisée en ce que
    l'élément de limitation de course (13) est en forme de poussoir.
  4. Installation de commande de soupape (1) selon l'une des revendications 1 à 3,
    caractérisée en ce que
    l'élément de limitation de course (13) est un levier à un ou deux bras (13a, 13b).
  5. Installation de commande de soupape (1) selon l'une des revendications 1 à 4,
    caractérisée par
    une installation d'activation (17) de préférence sous la forme d'un excentrique (18) agissant sur l'élément de limitation de course (13) dans le sens d'une limitation de la course.
  6. Installation de commande de soupape (1) selon l'une des revendications 1 à 5,
    caractérisée en ce que
    l'élément de limitation de course (13) comporte une pièce de butée (14) de préférence en forme de manchon qui, dans au moins une position active, agit sur la tige de soupape (6) ou sur l'organe de transmission (5) contre la direction d'ouverture de la soupape (2) dans le sens d'une limitation de sa course.
  7. Installation de commande de soupape (1) selon la revendication 6,
    caractérisée en ce que
    l'élément de limitation de course (13) comporte un organe amortisseur installé de préférence entre la pièce de butée (14) et le tiroir (13a, 13b) ou levier.
  8. Installation de commande de soupape (1) selon la revendication 7,
    caractérisée en ce que
    l'organe d'amortissement est formé par au moins un ressort Belleville (16).
  9. Installation de commande de soupape (1) selon l'une des revendications 1 à 8,
    caractérisée en ce qu'
    il est prévu en plus une installation pour régler le temps d'ouverture de la soupape, cette installation étant de préférence une installation de réglage de la phase de l'arbre à came (3).
EP20020450157 2002-07-12 2002-07-12 Dispositif de commande de soupape Expired - Lifetime EP1380728B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20020450157 EP1380728B1 (fr) 2002-07-12 2002-07-12 Dispositif de commande de soupape
DE50202718T DE50202718D1 (de) 2002-07-12 2002-07-12 Ventiltriebseinrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20020450157 EP1380728B1 (fr) 2002-07-12 2002-07-12 Dispositif de commande de soupape

Publications (2)

Publication Number Publication Date
EP1380728A1 EP1380728A1 (fr) 2004-01-14
EP1380728B1 true EP1380728B1 (fr) 2005-04-06

Family

ID=29724622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020450157 Expired - Lifetime EP1380728B1 (fr) 2002-07-12 2002-07-12 Dispositif de commande de soupape

Country Status (2)

Country Link
EP (1) EP1380728B1 (fr)
DE (1) DE50202718D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009621A1 (de) * 2012-05-15 2013-11-21 Neumayer Tekfor Holding Gmbh Ventilbetätigungsvorrichtung für einen Verbrennungsmotor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006018588A1 (de) * 2006-04-21 2007-10-25 Schaeffler Kg Ventilbetätigungseinrichtung, insbesondere für Gaswechselventile von Hubkolbenbrennkraftmaschinen
GB2566489A (en) * 2017-09-15 2019-03-20 Camcon Auto Ltd Actuation assembly and methods of operation thereof
CN109854323A (zh) * 2019-03-12 2019-06-07 北方工业大学 低功耗响应迅速的活塞发动机气门装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413965A (en) 1967-07-13 1968-12-03 Ford Motor Co Mechanism for varying the operation of a reciprocating member
JPS55137305A (en) 1979-04-13 1980-10-27 Nissan Motor Co Ltd Valve lift for internal combustion engine
JPS60162004A (ja) * 1984-01-31 1985-08-23 Mitsubishi Motors Corp 弁作動停止装置付きエンジン動弁機構
DE3519319A1 (de) 1985-05-30 1986-12-04 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Variable ventilsteuerung fuer eine hubkolben-brennkraftmaschine
US4638773A (en) 1986-02-28 1987-01-27 General Motors Corporation Variable valve lift/timing mechanism
US4724822A (en) 1986-02-28 1988-02-16 General Motors Corporation Variable valve lift/timing mechanism
US4986227A (en) 1990-05-08 1991-01-22 Dewey Iii Albert B Variable lift valve train
FR2676501B1 (fr) * 1991-05-15 1993-09-10 Peugeot Dispositif d'actionnement d'une soupape pour en faire varier la levee et/ou le calage.
US5365895A (en) 1991-12-03 1994-11-22 Motive Holdings Limited Variable valve lift mechanism for internal combustion engine
DE19712668C1 (de) * 1997-03-26 1998-05-07 Daimler Benz Ag Ventilantrieb für Gaswechselventile von Brennkraftmaschinen
IT1319908B1 (it) * 2000-02-10 2003-11-12 Gianluigi Buglioni Valvole per motori endotermici ad alzate e fasature variabili.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009621A1 (de) * 2012-05-15 2013-11-21 Neumayer Tekfor Holding Gmbh Ventilbetätigungsvorrichtung für einen Verbrennungsmotor
DE102012009621B4 (de) 2012-05-15 2023-06-29 Neumayer Tekfor Engineering Gmbh Ventilbetätigungsvorrichtung für einen Verbrennungsmotor

Also Published As

Publication number Publication date
DE50202718D1 (de) 2005-05-12
EP1380728A1 (fr) 2004-01-14

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