EP1072761B1 - Improved valve command device and internal combustion engine equipped with this device - Google Patents
Improved valve command device and internal combustion engine equipped with this device Download PDFInfo
- Publication number
- EP1072761B1 EP1072761B1 EP00402104A EP00402104A EP1072761B1 EP 1072761 B1 EP1072761 B1 EP 1072761B1 EP 00402104 A EP00402104 A EP 00402104A EP 00402104 A EP00402104 A EP 00402104A EP 1072761 B1 EP1072761 B1 EP 1072761B1
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- Prior art keywords
- valve
- cam
- around
- setting
- shaft
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Classifications
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- 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
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- 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
- F01L13/0063—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 cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
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- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the present invention relates to a control device of a valve and an internal combustion engine provided with this device.
- One of the main criteria for the design and development of an internal combustion engine is most often to increase the performance of the engine for a high rotational speed without degrading the performance, including available torque, low and medium speed.
- variable distribution systems it is known to use three-dimensional cams, that is to say whose profile is variable the along their axis of rotation.
- Such a design makes it possible, thanks displacement of the camshaft parallel to its axis of rotation, to obtain different distribution configurations.
- This design is particularly complex and leads to an increase in the longitudinal engine.
- FR-A-2,453,979 describes a device for controlling a valve internal combustion engine, of the type comprising a rocker, mounted articulated on a support, around a first axis of fixed oscillation, provided with a first arm urging the free end of the tail of the valve and a second arm urged by a rotary control cam, and means for adjusting the lift of the valve.
- the means for adjusting the valve lift described in this document comprising an eccentric associated with an axis of rotation of the tumbler, are relatively complex.
- Also known from GB-A-12069 is a control device of an internal combustion engine valve according to the preamble of claim 1.
- the object of the invention is to propose a control device a simple and inexpensive valve, reduced longitudinal dimensions, this avoiding as much as possible the use of elements sensitive to wear, in particular of elements continuously or frequently solicited in rotation.
- the subject of the invention is a control device valve, of the aforementioned type, characterized in that the contact surface of the adjustment cam with the second roller is curvilinear and curved substantially around the second axis of mobile rotation.
- the invention also relates to a combustion engine characterized in that it comprises a control device of valve as defined above, the valve being preferably a intake valve.
- Figures 1 and 2 are similar elevational views showing a valve control device according to two embodiments of the invention respectively.
- FIG. 1 shows a device 10 according to a first embodiment of the invention for controlling a valve 12 of internal combustion engine.
- This control device 10 is arranged in a cylinder head 14 of the engine.
- valve 12 is movable between a closed position, such shown in FIG. 1, resting on a seat 16 formed in the yoke 14, and an open position (not shown). Valve 12 is resiliently biased back to its closed position using conventional means not shown.
- control device 10 is intended to actuate an engine intake valve.
- this same device 10 could be used to actuate a valve exhaust.
- the control device 10 comprises a rocker 18, mounted articulated on the yoke 14, about a fixed axis of oscillation F1.
- the rocker 18 is provided with a first arm 18A urging the free end of the tail 20 of the valve 12 and a second arm 18B biased by a cam of rotary control 22. It will be noted that the rocker arm 18 forms a lever of the first kind.
- the cam 22 is carried by a conventional camshaft 24 mounted rotating around a fixed axis of rotation F2 forming the axis of rotation of the cam 22.
- the control device 10 also comprises means adjusting the lift of the valve 12 having an adjusting member 28 of triangular general shape.
- the adjusting member 28 is articulated on the second arm 18B of the rocker arm around a mobile oscillation axis M1.
- the regulator 28 carries two rotary rollers 30, 32.
- a first roller 30 is in contact with the control cam 22.
- This first roller 30 is mounted articulated on the body adjusting 28 around a first mobile axis of rotation R1.
- the second pebble 32 is in contact with an adjusting cam 34.
- This second roller 32 is hingedly mounted on the adjusting member 28 around a second axis of rotation mobile R2.
- axes F1, F2, M1, R1 and R2 are substantially parallel to each other. It will also be noted that the three movable axes M1, R1 and R2 form, in a plane perpendicular to them, the three vertices of a triangle. All axes F1, F2, M1, R1 and R2 are distinct two by two.
- the adjustment cam 34 is articulated on the cylinder head 14 around another fixed oscillation axis F3 substantially parallel to the preceding fixed oscillation axis F1 so that for a constant position of the cam 22 corresponding to a position of the valve where it is open, the displacements of this adjustment cam 34 vary the distance between the fixed axis of oscillation F1 and the second axis of mobile rotation R2.
- the contact surface of the adjustment cam 34 with the second roller 32 is delimited by a curvilinear surface 36 curving substantially around the second movable axis of rotation R2.
- the fixed oscillation axis F3 coincides with the first axis moving oscillation M1 when the valve 12 is in a position of reference, namely the closed position as illustrated in Figure 1.
- the adjustment cam 34 is moved using means conventional devices including, for example, an electric or hydraulic actuator.
- the rotary cam 22 biases the adjustment member 28 by intermediate of the first roller 30.
- the cam is controlled adjustment device 34 so as to rotate it about the fixed axis F3, which has for effect, for a constant position of the corresponding control cam 22 at a position of the valve 12 where it is open, to modify the distance between the fixed axis of oscillation F1 and the second axis of mobile rotation R2. Changing this distance causes the lift to change maximum of the valve 12.
- curvilinear ramp 36 continues with a portion 36A of inverse curvature and at least the portion adjacent to the ramp 36 is circular and centered on the axis F3.
- the layout is such that the roller 32 is is in contact with this circular part when the valve is closed.
- the adjustment of the lift of the valve can be realized continuously because the adjustment cam 34 can move continuously around the fixed axis F3.
- the engine comprises an associated crankshaft to the valve control device.
- the curve of the lifting of the valve depending on the rotation angle of the crankshaft conventionally has a shape general bell (see for example FR-A-2,453,979).
- FIG 2 there is shown a second embodiment of the control device 10 according to the invention.
- the elements similar to those of Figure 1 are designated by references identical.
- the control device 10 comprises means for adjusting the setting angular of the control cam 22.
- These adjustment means of the wedge comprise a pivot 40, materializing the first mobile axis of rotation R1, mounted movable in a curvilinear light 42 curving around the fixed axis of rotation F2 of the cam 22.
- the curvilinear light 42 is centered on an axis of setting C coinciding with the fixed axis of rotation F2 of the control cam 22 when the valve 12 is in a reference position, namely its closed position as shown in Figure 2.
- the pivot 40 is moved in the curvilinear lumen 42 with the aid of conventional means including, for example, an electric actuator or hydraulic. These means also make it possible to immobilize the pivot 40 in the light 42 in the desired adjustment setting position.
- the adjustment means calibration illustrated in Figure 2 allow to vary the delay or the advance of the opening and closing of the valve 12.
- the control device of a valve according to the invention allows the valve lift to be continuously adjusted by means of a adjustment cam 34 whose movements are limited, which reduces the risks of wear.
- the opening and closing of the valve are carried out in a progressive and silent way, this using means reduced space, especially in the longitudinal direction of the engine, namely the direction parallel to the fixed axis F1 oscillation of the rocker arm.
- the device of the invention can be used in an engine comprising one or two camshafts.
Abstract
Description
La présente invention concerne un dispositif de commande d'une soupape et un moteur à combustion interne muni de ce dispositif.The present invention relates to a control device of a valve and an internal combustion engine provided with this device.
Un des critères principaux pour la conception et la mise au point d'un moteur à combustion interne consiste le plus souvent à augmenter les performances du moteur pour un régime de rotation élevé sans dégrader les performances, et notamment le couple disponible, à bas et à moyen régime.One of the main criteria for the design and development of an internal combustion engine is most often to increase the performance of the engine for a high rotational speed without degrading the performance, including available torque, low and medium speed.
Pour aboutir à ce résultat, il est connu de faire varier la distribution du moteur en modifiant la levée des soupapes de ce moteur et/ou le calage angulaire des cames actionnant ces soupapes de manière à privilégier certaines performances dans une plage déterminée de régime.To achieve this result, it is known to vary the engine distribution by modifying the lift of the valves of this engine and / or the angular setting of the cams actuating these valves so as to to favor certain performances in a certain range of regime.
Parmi les systèmes de distribution variable existants, il est connu d'utiliser des cames à trois dimensions, c'est à dire dont le profil est variable le long de leur axe de rotation. Une telle conception permet, grâce à un déplacement de l'arbre à cames parallèlement à son axe de rotation, d'obtenir différentes configurations de distribution. Cette conception est particulièrement complexe et conduit à une augmentation de l'encombrement longitudinal du moteur.Of the existing variable distribution systems, it is known to use three-dimensional cams, that is to say whose profile is variable the along their axis of rotation. Such a design makes it possible, thanks displacement of the camshaft parallel to its axis of rotation, to obtain different distribution configurations. This design is particularly complex and leads to an increase in the longitudinal engine.
FR-A-2.453.979 décrit un dispositif de commande d'une soupape de moteur à combustion interne, du type comprenant un culbuteur, monté articulé sur un support, autour d'un premier axe d'oscillation fixe, muni d'un premier bras sollicitant l'extrémité libre de la queue de la soupape et d'un second bras sollicité par une came de commande rotative, et des moyens de réglage de la levée de la soupape.FR-A-2,453,979 describes a device for controlling a valve internal combustion engine, of the type comprising a rocker, mounted articulated on a support, around a first axis of fixed oscillation, provided with a first arm urging the free end of the tail of the valve and a second arm urged by a rotary control cam, and means for adjusting the lift of the valve.
Les moyens de réglage de la levée de soupape décrits dans ce document, comprenant un excentrique associé à un axe de rotation du culbuteur, sont relativement complexes.The means for adjusting the valve lift described in this document, comprising an eccentric associated with an axis of rotation of the tumbler, are relatively complex.
On connaít également dans le document GB-A-12069 un dispositif de commande d'une soupape de moteur de combustion interne selon le préambule de la revendication 1.Also known from GB-A-12069 is a control device of an internal combustion engine valve according to the preamble of claim 1.
L'invention a pour but de proposer un dispositif de commande d'une soupape simple et peu coûteux, d'encombrement longitudinal réduit, ceci en évitant autant que possible l'utilisation d'éléments sensibles à l'usure, en particulier d'éléments continuellement ou fréquemment sollicités en rotation.The object of the invention is to propose a control device a simple and inexpensive valve, reduced longitudinal dimensions, this avoiding as much as possible the use of elements sensitive to wear, in particular of elements continuously or frequently solicited in rotation.
A cet effet, l'invention a pour objet un dispositif de commande d'une soupape, du type précité, caractérisé en ce que la surface de contact de la came de réglage avec le second galet est curviligne et s'incurve sensiblement autour du second axe de rotation mobile.For this purpose, the subject of the invention is a control device valve, of the aforementioned type, characterized in that the contact surface of the adjustment cam with the second roller is curvilinear and curved substantially around the second axis of mobile rotation.
Suivant d'autres caractéristiques de ce dispositif de commande :
- il comprend des moyens de réglage du calage angulaire de la came de commande,
- les moyens de réglage du calage comprennent un pivot matérialisant le premier axe de rotation mobile, monté déplaçable dans une lumière curviligne s'incurvant autour d'un axe de rotation fixe de la came de commande,
- la lumière curviligne est centrée sur un axe de calage coïncidant avec l'axe de rotation fixe de la came de commande lorsque la soupape est dans une position de référence.
- it comprises means for adjusting the angular setting of the control cam,
- the adjustment means comprise a pivot materializing the first movable axis of rotation, movably mounted in a curvilinear lumen curving around a fixed axis of rotation of the control cam,
- the curvilinear lumen is centered on a wedge axis coinciding with the fixed axis of rotation of the control cam when the valve is in a reference position.
L'invention a également pour objet un moteur à combustion interne caractérisé en ce qu'il comprend un dispositif de commande de soupape tel que défini ci-dessus, la soupape étant de préférence une soupape d'admission.The invention also relates to a combustion engine characterized in that it comprises a control device of valve as defined above, the valve being preferably a intake valve.
Les figures 1 et 2 sont des vues en élévation similaires montrant un dispositif de commande d'une soupape selon deux modes de réalisation de l'invention respectivement.Figures 1 and 2 are similar elevational views showing a valve control device according to two embodiments of the invention respectively.
On a représenté sur la figure 1 un dispositif 10 selon un premier
mode de réalisation de l'invention pour la commande d'une soupape 12 de
moteur à combustion interne. Ce dispositif de commande 10 est agencé dans
une culasse 14 du moteur. FIG. 1 shows a
La soupape 12 est déplaçable entre une position fermée, telle
que représentée sur la figure 1, en appui sur un siège 16 ménagé dans la
culasse 14, et une position ouverte (non représentée). La soupape 12 est
rappelée élastiquement vers sa position fermée à l'aide de moyens classiques
non représentés.The
Dans l'exemple décrit, le dispositif de commande 10 est destiné
à actionner une soupape d'admission du moteur. Toutefois, en variante, ce
même dispositif 10 pourrait être utilisé pour actionner une soupape
d'échappement.In the example described, the
Le dispositif de commande 10 comprend un culbuteur 18, monté
articulé sur la culasse 14, autour d'un axe d'oscillation fixe F1. Le culbuteur
18 est muni d'un premier bras 18A sollicitant l'extrémité libre de la queue 20
de la soupape 12 et d'un second bras 18B sollicité par une came de
commande rotative 22. On notera que le culbuteur 18 forme un levier du
premier genre.The
La came 22 est portée par un arbre à cames classique 24 monté
rotatif autour d'un axe de rotation fixe F2 formant l'axe de rotation de la came
22.The
Le dispositif de commande 10 comprend également des moyens
de réglage de la levée de la soupape 12 comportant un organe de réglage 28
de forme générale triangulaire.The
L'organe de réglage 28 est monté articulé sur le second bras
18B du culbuteur autour d'un axe d'oscillation mobile M1. L'organe de réglage
28 porte deux galets rotatifs 30, 32. Un premier galet 30 est en contact avec la
came de commande 22. Ce premier galet 30 est monté articulé sur l'organe
de réglage 28 autour d'un premier axe de rotation mobile R1. Le second galet
32 est en contact avec une came de réglage 34. Ce second galet 32 est
monté articulé sur l'organe de réglage 28 autour d'un second axe de rotation
mobile R2.The adjusting
On notera que les axes F1, F2, M1, R1 et R2 sont sensiblement parallèles entre eux. On notera également que les trois axes mobiles M1, R1 et R2 forment, dans un plan qui leur est perpendiculaire, les trois sommets d'un triangle. Tous les axes F1, F2, M1, R1 et R2 sont distincts deux à deux.It will be noted that the axes F1, F2, M1, R1 and R2 are substantially parallel to each other. It will also be noted that the three movable axes M1, R1 and R2 form, in a plane perpendicular to them, the three vertices of a triangle. All axes F1, F2, M1, R1 and R2 are distinct two by two.
La came de réglage 34 est montée articulée sur la culasse 14
autour d'un autre axe d'oscillation fixe F3 sensiblement parallèle au précédent
axe d'oscillation fixe F1 de sorte que, pour une position constante de la came
de commande 22 correspondant à une position de la soupape où celle-ci est
ouverte, les déplacements de cette came de réglage 34 fassent varier la
distance entre l'axe d'oscillation fixe F1 et le second axe de rotation mobile
R2.The
De préférence, la surface de contact de la came de réglage 34
avec le second galet 32 est délimitée par une surface curviligne 36 s'incurvant
sensiblement autour du second axe de rotation mobile R2.Preferably, the contact surface of the
L'axe d'oscillation fixe F3 coïncide avec le premier axe
d'oscillation mobile M1 lorsque la soupape 12 est dans une position de
référence, à savoir la position fermée telle qu'illustrée sur la figure 1.The fixed oscillation axis F3 coincides with the first axis
moving oscillation M1 when the
La came de réglage 34 est déplacée à l'aide de moyens
classiques comprenant, par exemple, un actionneur électrique ou hydraulique.The
Au cours du fonctionnement du dispositif de commande 10
illustré sur la figure 1, la came rotative 22 sollicite l'organe de réglage 28 par
l'intermédiaire du premier galet 30. Cet organe de réglage 28, articulé sur le
culbuteur 18 et en appui roulant sur la rampe 36 par l'intermédiaire du second
galet 32, sollicite le culbuteur 18 de façon à actionner la soupape 12. Lors du
déplacement angulaire de la came 22, le second galet 32 roule sur la rampe
36.During the operation of the
Pour modifier la levée de la soupape 12, on commande la came
de réglage 34 de façon à la faire pivoter autour de l'axe fixe F3, ce qui a pour
effet, pour une position constante de la came de commande 22 correspondant
à une position de la soupape 12 où celle-ci est ouverte, de modifier la
distance entre l'axe d'oscillation fixe F1 et le second axe de rotation mobile
R2. La modification de cette distance provoque une modification de la levée
maximale de la soupape 12.To modify the lift of the
On notera que la rampe curviligne 36 se poursuit par une partie
36A de courbure inverse et dont au moins la partie adjacente à la rampe 36
est circulaire et centrée sur l'axe F3. La disposition est telle que le galet 32 se
trouve en contact avec cette partie circulaire lorsque la soupape est fermée.Note that the
Du fait que l'axe M1 coïncide avec l'axe F3 lorsque la soupape
est fermée, si on modifie le réglage, c'est-à-dire la position de la came de
réglage 34 dans cette situation, aucune autre pièce ne bouge car le dispositif
est agencé pour que, dans ce cas, seule la partie circulaire soit en contact
avec le galet 32. On assure ainsi que la soupape reste fermée quand elle doit
être fermée, c'est-à-dire quand le dos de la came est en contact avec le galet
30 (le «dos» de la came est la partie de celle-ci qui correspond à la fermeture
de la soupape lorsqu'elle est en contact avec le culbuteur ou une pièce
intermédiaire).Since the axis M1 coincides with the axis F3 when the valve
is closed, if you change the setting, ie the position of the cam of
On notera que le réglage de la levée de la soupape peut être
réalisé de façon continue du fait que la came de réglage 34 peut se déplacer
de façon continue autour de l'axe fixe F3.It should be noted that the adjustment of the lift of the valve can be
realized continuously because the
De façon classique, le moteur comporte un vilebrequin associé au dispositif de commande de soupape. La courbe de la levée de la soupape en fonction de l'angle de rotation du vilebrequin a classiquement une forme générale de cloche (voir par exemple FR-A-2.453.979).In a conventional manner, the engine comprises an associated crankshaft to the valve control device. The curve of the lifting of the valve depending on the rotation angle of the crankshaft conventionally has a shape general bell (see for example FR-A-2,453,979).
Quelle que soit la position de la came de réglage 34, le second
galet 32 roule dans tous les cas au contact de la même surface de came 36
de cette came de réglage 34. De ce fait, on observe que différentes positions
de la came de réglage 34 conduisent à différentes levées de la soupape 12
correspondant à différentes courbes de levée de cette soupape en fonction de
l'angle de rotation du vilebrequin du moteur. Ces différentes courbes sont
toutes sensiblement symétriques et présentent à l'ouverture et à la fermeture
de la soupape des tangentes de faible pente gages de silence du dispositif de
commande.Whatever the position of the
Sur la figure 2, on a représenté un second mode de réalisation
du dispositif de commande 10 selon l'invention. Sur cette figure 2, les
éléments analogues à ceux de la figure 1 sont désignés par des références
identiques.In Figure 2, there is shown a second embodiment
of the
Le dispositif de commande 10 selon le deuxième mode de
réalisation de l'invention comprend des moyens de réglage du calage
angulaire de la came de commande 22.The
Ces moyens de réglage du calage comprennent un pivot 40,
matérialisant le premier axe de rotation mobile R1, monté déplaçable dans
une lumière curviligne 42 s'incurvant autour de l'axe de rotation fixe F2 de la
came 22.These adjustment means of the wedge comprise a
De préférence, la lumière curviligne 42 est centrée sur un axe de
calage C coïncidant avec l'axe de rotation fixe F2 de la came de commande
22 lorsque la soupape 12 est dans une position de référence, à savoir sa
position fermée telle qu'illustrée sur la figure 2.Preferably, the
Comme expliqué précédemment à propos des axes F3 et M1, du
fait que les axes F2 et C coïncident lorsque la soupape est fermée, si on
déplace le pivot 40 dans la lumière 42 dans cette situation, le galet 30 reste
en contact avec le dos de la came 22 et aucune autre pièce ne bouge. Ainsi,
quelle que soit la position du pivot 40 dans la lumière 42, la soupape reste
fermée quand elle doit l'être, c'est-à-dire quand le dos de la came 22 est en
contact avec le galet 30.As previously explained with respect to the F3 and M1 axes, the
fact that the axes F2 and C coincide when the valve is closed, if
moves the
Le pivot 40 est déplacé dans la lumière curviligne 42 à l'aide de
moyens classiques comprenant, par exemple, un actionneur électrique ou
hydraulique. Ces moyens permettent également d'immobiliser le pivot 40 dans
la lumière 42 dans la position de réglage de calage souhaitée.The
Dans le cas d'une soupape d'admission, les moyens de réglage
du calage illustrés sur la figure 2 permettent de faire varier le retard ou
l'avance de l'ouverture et de la fermeture de la soupape 12.In the case of an intake valve, the adjustment means
calibration illustrated in Figure 2 allow to vary the delay or
the advance of the opening and closing of the
Parmi les avantages de l'invention on notera les suivants.Among the advantages of the invention will be noted the following.
Le dispositif de commande d'une soupape selon l'invention
permet de régler de façon continue la levée de la soupape, ceci à l'aide d'une
came de réglage 34 dont les déplacements sont limités, ce qui réduit les
risques d'usure.The control device of a valve according to the invention
allows the valve lift to be continuously adjusted by means of a
Ce risque d'usure est d'autant plus réduit que les moyens de réglage de la levée de la soupape ne requièrent pas d'élément tournant en permanence.This risk of wear is all the more limited as the means of valve lift adjustment do not require a rotating element permanently.
Par ailleurs, l'ouverture et la fermeture de la soupape sont réalisées de façon progressive et silencieuse, ceci à l'aide de moyens d'encombrement réduit, notamment dans la direction longitudinale du moteur, à savoir la direction parallèle à l'axe fixe F1 d'oscillation du culbuteur.Moreover, the opening and closing of the valve are carried out in a progressive and silent way, this using means reduced space, especially in the longitudinal direction of the engine, namely the direction parallel to the fixed axis F1 oscillation of the rocker arm.
De plus, les différentes courbes de levée de la soupape en
fonction de l'angle de rotation du vilebrequin obtenues pour différents
réglages de la position de la came de réglage 34 sont symétriques, le retard à
l'ouverture d'admission (dans le cas d'une soupape d'admission) pouvant être
annulé par les moyens de réglage du calage angulaire de la came de
commande.In addition, the different curves of lift of the valve in
depending on the rotation angle of the crankshaft obtained for different
Adjustments of the position of the
Enfin, on notera que le dispositif de l'invention peut être utilisé dans un moteur comprenant un ou deux arbres à cames.Finally, it will be noted that the device of the invention can be used in an engine comprising one or two camshafts.
Claims (5)
- Device for controlling an internal combustion engine valve (12) of the type including a rocker (18) mounted so that it is articulated to a mounting (14), around a first fixed oscillation shaft (F1), fitted with a first arm (18A) prompting the free end of the stem (20) of the valve (12) and a second arm (18B) prompted by a rotary operating cam (22), and means (28, 34) of setting the lift of the valve consisting of an adjustment unit (28), fitted so that it is articulated onto the second arm (18B) of the rocker around a moving oscillating shaft (M1), a first roller (30) for contact with the operating cam (22), which is mounted so that it is articulated onto the adjustment unit (28) around a first moving rotational shaft (R1), and a second roller (32) for contact with a setting cam (34) which is fitted so that it is articulated onto the adjustment unit (28) around a second moving rotational shaft (R2), the oscillating (F1, M1) and rotational (R1, R2) shafts all being separate and more or less parallel with each other, the setting cam (34) being fitted so that it is articulated onto the mounting 14 around a second fixed oscillating shaft (F3) more or less parallel to the first fixed oscillating shaft (F1) so that, for a constant position of the operating cam (22) corresponding to a position of the valve (12) where it is open, the movements of this setting cam (34) vary the distance between the first fixed oscillating shaft (F1) and the second moving rotational shaft (R2), characterised in that the contact surface (36) of the setting cam (34) with the second roller (32) is curvilinear and curves inward more or less around the second moving rotational shaft (R2).
- Device according to Claim 1, characterised in that it includes means (40, 42; 44) of adjusting the angular setting of the operating cam (22).
- Device according to Claim 2, characterised in that the means of adjusting the setting include a pivot (40) materialising the first moving rotational shaft (R1), fitted so as to be movable in a curved opening (42) which curves inward around a fixed rotational shaft (F2) of the operating cam (22).
- Device according to Claim 3, characterised in that the curvilinear opening (42) is centred on a setting shaft (C) coinciding with the fixed rotational shaft (F2) of the operating cam when the valve (12) is in a danum position.
- Internal combustion engine, characterised in that it includes a valve operating device according to any one of the above claims, the valve preferably being an inlet valve.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9909811A FR2796983B1 (en) | 1999-07-28 | 1999-07-28 | IMPROVED DEVICE FOR CONTROLLING A VALVE AND INTERNAL COMBUSTION ENGINE PROVIDED WITH THIS DEVICE |
FR9909811 | 1999-07-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1072761A2 EP1072761A2 (en) | 2001-01-31 |
EP1072761A3 EP1072761A3 (en) | 2002-01-16 |
EP1072761B1 true EP1072761B1 (en) | 2005-03-16 |
Family
ID=9548631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00402104A Expired - Lifetime EP1072761B1 (en) | 1999-07-28 | 2000-07-21 | Improved valve command device and internal combustion engine equipped with this device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1072761B1 (en) |
AT (1) | ATE291151T1 (en) |
DE (1) | DE60018650T2 (en) |
FR (1) | FR2796983B1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1205643A1 (en) * | 2000-11-13 | 2002-05-15 | Stefan Battlogg | Valve drive in an internal combustion engine |
FR2839112A1 (en) * | 2002-04-26 | 2003-10-31 | Roger Lecal | DISTRIBUTION MECHANISM WITH EXTENDED ANGLE OPENING AND NUMBER OF VARIABLE VALVES AND INTERNAL COMBUSTION ENGINE EQUIPPED WITH SAID MECHANISM |
JP4381188B2 (en) * | 2004-03-19 | 2009-12-09 | 三菱ふそうトラック・バス株式会社 | Variable valve operating device for internal combustion engine |
WO2005090758A1 (en) * | 2004-03-23 | 2005-09-29 | Mitsubishi Fuso Truck And Bus Corporation | Variable valve gear of internal combustion engine |
CN100406689C (en) * | 2004-04-27 | 2008-07-30 | 三菱扶桑卡客车公司 | Variable valve gear of internal combustion engine |
FR2882781B1 (en) * | 2005-03-07 | 2010-06-18 | Peugeot Citroen Automobiles Sa | DEVICE CONTROLLING THE OPENING AND CLOSING OF ONE OR MORE VALVES OF AN INTERNAL COMBUSTION ENGINE AND AN INTERNAL COMBUSTION ENGINE COMPRISING SUCH A DEVICE |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190906650A (en) * | 1909-03-19 | 1909-10-14 | Paxman & Co Ltd Davey | Improvements in Valve Gear for Internal Combustion Engines. |
DE3438556A1 (en) * | 1984-10-20 | 1986-04-24 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen | VALVE CONTROL OF A RECHARGEED 4-STROKE COMBUSTION ENGINE |
DE3833540A1 (en) * | 1988-10-01 | 1990-04-12 | Peter Prof Dr Ing Kuhn | DEVICE FOR ACTUATING THE VALVES OF INTERNAL COMBUSTION ENGINES WITH VARIABLE VALVE LIFTING CURVE |
DE4220816A1 (en) * | 1992-06-25 | 1994-01-05 | Schaeffler Waelzlager Kg | Adjustable valve control for IC engine - has adjustable intermediate member between cam and pivot lever along guide path |
-
1999
- 1999-07-28 FR FR9909811A patent/FR2796983B1/en not_active Expired - Fee Related
-
2000
- 2000-07-21 EP EP00402104A patent/EP1072761B1/en not_active Expired - Lifetime
- 2000-07-21 DE DE60018650T patent/DE60018650T2/en not_active Expired - Lifetime
- 2000-07-21 AT AT00402104T patent/ATE291151T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE291151T1 (en) | 2005-04-15 |
DE60018650T2 (en) | 2006-05-04 |
EP1072761A3 (en) | 2002-01-16 |
FR2796983B1 (en) | 2001-10-26 |
EP1072761A2 (en) | 2001-01-31 |
FR2796983A1 (en) | 2001-02-02 |
DE60018650D1 (en) | 2005-04-21 |
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