FR2480854A1 - Hydraulic valve control for IC engine - has oil filled chamber with two cam operated pistons controlling valve piston - Google Patents

Hydraulic valve control for IC engine - has oil filled chamber with two cam operated pistons controlling valve piston Download PDF

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Publication number
FR2480854A1
FR2480854A1 FR8009001A FR8009001A FR2480854A1 FR 2480854 A1 FR2480854 A1 FR 2480854A1 FR 8009001 A FR8009001 A FR 8009001A FR 8009001 A FR8009001 A FR 8009001A FR 2480854 A1 FR2480854 A1 FR 2480854A1
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FR
France
Prior art keywords
valve
cams
pistons
piston
engine
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
FR8009001A
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French (fr)
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FR2480854B1 (en
Inventor
Jean-Pierre Riviere
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Priority to FR8009001A priority Critical patent/FR2480854A1/en
Publication of FR2480854A1 publication Critical patent/FR2480854A1/en
Application granted granted Critical
Publication of FR2480854B1 publication Critical patent/FR2480854B1/fr
Granted 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0047—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
    • 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
    • F01L1/024—Belt 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
    • 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]

Abstract

The operating drive for the valves of an internal combustion engine uses a hydraulic controller (1) with a T shaped body with a piston (5,6,7) in each branch. One piston (5) has a rod carrying a valve (8) to be operated, and the other two pistons (6,7) which are in line, control the opening and closing operations. Both of the in-line pistons are operated by elliptical cams (11,12) mounted on spindles (13,14) which can be rotated by planet gears driven by the engine. The valve piston has a spring (9) behind it, tending to hold it in the closed position. The controller is filled with oil supplied by a line (15) with a spring loaded check valve (17) at the entry point.

Description

Commande de soupapes de moteurs à combustion interne par distributeur hydraulique à faible consommation de puissance
Pour la commande des soupapes de moteurs à combustion interne comportant des soupapes d'entrée d'air ou de mélange combustible et de sortie de gaz brûlées, il est connu d'utiliser des modes de commande par distributeur mécanique ou hydraulique 3 ces réalisations sont onéreuses et de précision insuffisante dans le cas des distributeurs hydrauliques, ou bien compliquées et peu fiables dans le cas de mécanismes purement mécaniques.Control of valves of internal combustion engines by hydraulic distributor with low power consumption
For controlling the valves of internal combustion engines having air intake or fuel mixture valves and exhaust gas burners, it is known to use control modes by mechanical or hydraulic distributor 3 these achievements are expensive and insufficient precision in the case of hydraulic distributors, or complicated and unreliable in the case of purely mechanical mechanisms.

L'invention a pour but un dispositif hydraulique permettant d'atteindre avec un maximum d'avantages au point de vue coût de réalisation, fiabilité, rendement mécanique, précision et silence de fonctionnement, la variabilité des lois d'ouverture et de fermeture des soupapes. The aim of the invention is a hydraulic device which makes it possible to achieve maximum advantages from the point of view of production cost, reliability, mechanical efficiency, accuracy and silence of operation, the variability of the opening and closing laws of the valves. .

Selon l'invention, à chaque soupape est associé un dispositif constitué d'un corps creux, empli d'un fluide tel que l'huile, avantageusement en forme de t ou de Y, présentant aux extranités des trois branches un alésage cylindrique, dans chacun desquels est disposé un'piston, l'un des pistons étant associé à la soupape à commander et les deux autres étant associés k des cames rotatives entraînées par des arbres convenables, la position et la forme des cames étant conjuguées de telle sorte que, par une rotation convenable des arbres d'entratnement,-on peint conan- der de façon réglable la descente et la levée de la soupape et, en conséquence, par exemple l'ouverture et la fermeture de la canalisation correspondante.According to the invention, each valve is associated with a device consisting of a hollow body, filled with a fluid such as oil, advantageously t-shaped or Y-shaped, having at the extranities of the three branches a cylindrical bore, in which each of which is disposed a piston, one of the pistons being associated with the valve to be controlled and the other two being associated with rotating cams driven by suitable shafts, the position and the shape of the cams being conjugated so that, by a suitable rotation of the drive shafts, it is possible to adjustably contemplate the descent and the lifting of the valve and, consequently, for example the opening and closing of the corresponding pipe.

L'invention sera maintenant décrite à titre d'exemple, en se référant au dessin annexé dans lequel t - la figure 1 est un diagramme des mouvements de levée et de
descente des soupapes - la figure' 2 est une rampe en élévation d'une forme préférée
de réalisation g - la figure 3 est une vue de face atun train planétaire
disposé sur l'un des arbres ; - la figure 4 est une coupe selon Iv-Iv de la figure 3.The invention will now be described by way of example with reference to the accompanying drawing in which FIG. 1 is a diagram of the lifting and
down the valves - Figure '2 is an elevation ramp of a preferred shape
embodiment g - Figure 3 is a front view atun planetary gear
arranged on one of the trees; - Figure 4 is a section along Iv-Iv of Figure 3.

Le diagramme de la figure 1 montre, en fonction de l'angle < du vilebrequ;n dans le cas d'un moteur thermique à cylindres, les angles 90 et #f de levée et de fermeture à obtenir pour une série de soupapes, les angles de levée étant différents de ceux de fermeture.The diagram of FIG. 1 shows, as a function of the angle <of the crankshaft n in the case of a cylinder engine, the angles 90 and # f of lifting and closing to be obtained for a series of valves, the lifting angles being different from those of closure.

Selon l'invention, des lois variables de levée et de fermeture sont réalisées comme étant la conséquence d'un mouvement relatif de deux cames0
Si l'on se reporte à la figure' 2, on voit que le distributeur est constitué d'un corps creux 1 en forme de T, dont les extrémités de la barre transversale et de la tige comportent des alésages 2, 3,. 4 dans lesquels sont disposés avec un jeuconvenable des pistons 5, 6, 7.According to the invention, variable lifting and closing laws are realized as being the consequence of a relative movement of two cams.
Referring to FIG. 2, it can be seen that the distributor consists of a T-shaped hollow body 1 whose ends of the transverse bar and of the rod comprise bores 2, 3,. 4 in which are arranged with a pistons 5, 6, 7.

Le piston 5 est associé b la soupape 8 et a un ressort de rappel 9 appuyé, d'une part sur la culasse du moteur 20 et, d'autre part, sur une coupelle d'appui 10 solidaire d'un piston 50
Les pistons 6 et 7 sont appuyés respectivement par des cames il et 12, entraînées en rotation-par des arbres 13 et 14 en liaison avec le vilebrequin du moteur.The piston 5 is associated with the valve 8 and has a return spring 9 supported, on the one hand on the cylinder head of the engine 20 and, on the other hand, on a support cup 10 secured to a piston 50
The pistons 6 and 7 are respectively supported by cams 11 and 12, driven in rotation-by shafts 13 and 14 in connection with the crankshaft of the engine.

Le piston 7 comporte un axe de commande 2t ma par les flancs de la caue 12, un ressort 22 maintenant une pression suffisante pour refouler le piston 6 de telle sorte que celui-ci soit en contact permanent avec la came 11, afin d'éviter tout choc entre les pistons 6 et 7 et leurs cames respectives de commande 11 et 12. Le ressort 22 s'appuie sur une butée 23 rapportée sur le corps 1 du dispositif de commande.The piston 7 comprises a control shaft 2t ma by the sides of the caue 12, a spring 22 maintaining a sufficient pressure to push the piston 6 so that it is in permanent contact with the cam 11, in order to avoid any shock between the pistons 6 and 7 and their respective control cams 11 and 12. The spring 22 is supported on a stop 23 attached to the body 1 of the control device.

Le piston 5 est m@ par la mise-en pression d'un fluide^ tel que de l'huile, enfermé dans le corps t entre les trois pistons 5, 6 et 7 correctement ajustés dans le corps 1. Le mouvement relatif des pistons 6 et 7 conditionne le mouvement de la soupape 8. En effet, la came li présentant sa protubérance positive en premier, refoule le piston 6 pendant que le piston 7 est maintenu en position par la came 12. La mise en mouvement du piston 6 entratne l'ouverture de la soupape 8 par l'inter- médiaire de la mise en pression de l'huile.La came 12, correctement orientée par rapport k la came 10, présente une diminutien de son rayon polaire pour assurer le recul du piston 7, créant ainsi un volume supplémentaire pour l'huile, limitant la levée de la soupape 8 et assurant ainsi sa fermeture0
La fermeture de la soupape 8 est assurée lorsque le rayon polaire de la came 12 a décru d'une çuanti+ égale k- l'aug- mentation du rayon polaire de la came 11
Les cames 11 et 12 sont assujetties k tourner en synchronisme (même vitesse de rotation), le déphasage de l'une ou l'autre came pouvant outre classiquement assuré par l'intermédiaire d'un entratnement planétaire, disposé entre les arbres d'entraînement 13 et 14.The piston 5 is m @ by the pressurization of a fluid ^ such as oil, enclosed in the body t between the three pistons 5, 6 and 7 properly fitted in the body 1. The relative movement of the pistons 6 and 7 condition the movement of the valve 8. In fact, the cam li having its positive protrusion first, represses the piston 6 while the piston 7 is held in position by the cam 12. The setting in motion of the piston 6 entralne the opening of the valve 8 by means of the pressurization of the oil. The cam 12, correctly oriented with respect to the cam 10, has a decrease in its polar radius to ensure the retraction of the piston 7 , thus creating an additional volume for the oil, limiting the lifting of the valve 8 and thus ensuring its closure
The closing of the valve 8 is ensured when the polar radius of the cam 12 has decreased by an amount equal to the increase of the polar radius of the cam 11
The cams 11 and 12 are subject to rotate in synchronism (same rotational speed), the phase shift of one or the other cam can in addition classically ensured through a planetary drive, arranged between the drive shafts 13 and 14.

Un exemple d'entraînement par train épicycloïdal a été représenté aux figures 3 et 4.An example of an epicyclic gear train has been shown in FIGS. 3 and 4.

L'arbre 13a,associ à l'arbre 13, portant les cames d'ouverture 11 et l'arbre 14 portant les cames de fermeture 12 sont entraînés respectivement par des poulies 29-30, k partir d'une poulie motrice 31, au moyen d'une courroie crantée 32.The shaft 13a, associated with the shaft 13, carrying the opening cams 11 and the shaft 14 carrying the closing cams 12 are respectively driven by pulleys 29-30, from a driving pulley 31, to using a toothed belt 32.

Entre les arbres 13a et 13 est disposé un train épicycloïdal 33. Ce train est composé d'une couronne 34 liée rigidement k l'arbre 13 d'un porte-satellite 35 supportant les pignons satellites 36, d'un pignon central d'entraine.ment 37 lié rigi dement b l'arbre 13a0 Un.levier-38, lié rigidement au portesatellite 35, permet de déphaser angulairement l'arbre 13 par rapport k 'l'arbre 14.Between the shafts 13a and 13 is disposed an epicyclic gear train 33. This train is composed of a ring 34 rigidly connected to the shaft 13 of a planet carrier 35 supporting the planet gears 36, a central gear wheel 37 is rigidly connected to the shaft 13a0. A lever 38, rigidly connected to the satellite 35, angularly displaces the shaft 13 relative to the shaft 14.

Par un choix convenable des rayons des poulies 29 et 30, il est possible d'obtenir des vitesses de rotation-identiques des - arbres t3 et 14, lorsque le porte-satellité est bloqué0
Par un déplacement dans un-sens ou dans l'autre du portesatellite, on réal-ise un déphasage en avant ou en arrière de l'arbre 13 par rapport à l'arbre 14.By a suitable choice of the radii of the pulleys 29 and 30, it is possible to obtain rotation-identical speeds of the shafts t3 and 14, when the satellite carrier is blocked.
By a movement in one direction or the other of the porteatellite, it is real-ise a phase shift forward or back of the shaft 13 relative to the shaft 14.

Le dispositif peut comporter un rattrapage de jeu automatique, en disposant une arrivée dthuile sous pression 15 dans un clapet anti-retour classique 16 obturé par la bille 17, dont le tarage d'ouverture est défini par la tension du ressort 18.The device may comprise an automatic backlash, by arranging a pressurized oil inlet 15 in a conventional non-return valve 16 closed by the ball 17, whose opening setting is defined by the tension of the spring 18.

Une propriété intéressånte de ce dispositif consiste à travailler à volume d'huile constant entre les trois pistons et à comporter des sections importantes, de telle sorte que la vis cosité de l'huile n'affaiblisse pas les propriétés de temps de réponse de la commande.An interesting property of this device is to work at constant oil volume between the three pistons and to include important sections, so that the cosity screw of the oil does not weaken the response time properties of the order .

La commande est précise, car la pression de lthuile est réglée par le tarage du ressort de rappel 9, qui maintient les pistons 6 et 7 en appui sur le dos des cames.The control is accurate because the oil pressure is adjusted by the setting of the return spring 9, which keeps the pistons 6 and 7 resting on the back of the cams.

Naturellement, la forme du corps creux t pourrait outre différente de celle représentée, par exemple en forme de I, sans sortir du cadre de l'invention0 Naturally, the shape of the hollow body t could also be different from that shown, for example in the form of I, without departing from the scope of the invention.

Claims (1)

REVENDICAT IONS 10 Dispositif de commande de soupapes de moteurs B combustion interne par distributeur hydraulique, caractérisé par ceci qu'il est constitué d'un corps creux rempli d'un fluide (1) tel que de l'buire et présentant trois alésages (2, 3, 4) dans chacun desquels est disposé un miston (5, 6, 7), l'un des pistons (5) étant lié à une soupape B commander (8), appuyée sur son siège par un ressort (9), et les deux autres pistons (6, 7) étant chacun appuyé par une came (t1, 12) montée sur un arbre rotatif (13, 14), les cames ayant des formes conjuguées et étant entraînées en rotation de teilesorte qu'elles provoquent le soulèvement ou l'enfoncement de la soupape (8) suivant une loi déterminée0 2.Dispositif de commande selon la revendication 1, caracté- risé par ceci que l'une des cames (11) détermine l'angle d'ouverture de la soupape et l'autre came (12) l'angle de fermeture de la soupape.The internal combustion valve control device B by hydraulic distributor, characterized in that it consists of a hollow body filled with a fluid (1) such as buire and having three bores (2). , 3, 4) in each of which is disposed a miston (5, 6, 7), one of the pistons (5) being connected to a valve B commander (8), supported on its seat by a spring (9), and the other two pistons (6, 7) being each supported by a cam (t1, 12) mounted on a rotatable shaft (13, 14), the cams having conjugate shapes and being rotated in rotation so that they cause the lifting or depression of the valve (8) according to a specific law. 2. Control device according to claim 1, characterized in that one of the cams (11) determines the opening angle of the valve and the other cam (12) the closing angle of the valve. 30 Dispositif selon la revendication 1, caractérisé par ceci qu'il est prévu un rattrapage de jeu automatique au moyen d'une canalisation d'arrivée de fluide (15) munie d'un clapet anti-retour (16).Apparatus according to claim 1, characterized in that an automatic backlash is provided by means of a fluid inlet pipe (15) provided with a non-return valve (16). 4. Forme de réalisation d'un dispositif selon l'une quelconque des revendications précédentes, caractérisée par ceci que le corps a une forme en T, les pistons (6, 7) actionnés par les cames étant situés dans des alésages (3, 4) portés aux extrémités de la barre transversale, et le piston (5) lié å la soupape étant disposé k la partie inférieure de la tige verticale (2) du To 5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par ceci outil est appliqué k-un moteur thermique. 4. Embodiment of a device according to any one of the preceding claims, characterized in that the body has a T-shape, the pistons (6, 7) actuated by the cams being located in bores (3, 4). ) at the ends of the transverse bar, and the piston (5) connected to the valve being arranged at the lower part of the vertical rod (2) of the To 5. Device according to any one of the preceding claims, characterized by this tool is applied k-a heat engine. 60 Dispositif selon la revendication 1, caractérisé- par ceci que les deux cames (11, 12) sont montéés respectivement sur un arbre d'entratnement (13, 14), les deux arbres étant liés entre eux par un train planétaire (33) permettant un déphasage variable entre les cames.  60 Device according to claim 1, characterized in that the two cams (11, 12) are mounted respectively on a drive shaft (13, 14), the two shafts being interconnected by a sun gear (33) allowing a variable phase shift between the cams.
FR8009001A 1980-04-22 1980-04-22 Hydraulic valve control for IC engine - has oil filled chamber with two cam operated pistons controlling valve piston Granted FR2480854A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8009001A FR2480854A1 (en) 1980-04-22 1980-04-22 Hydraulic valve control for IC engine - has oil filled chamber with two cam operated pistons controlling valve piston

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Application Number Priority Date Filing Date Title
FR8009001A FR2480854A1 (en) 1980-04-22 1980-04-22 Hydraulic valve control for IC engine - has oil filled chamber with two cam operated pistons controlling valve piston

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FR2480854A1 true FR2480854A1 (en) 1981-10-23
FR2480854B1 FR2480854B1 (en) 1984-05-25

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3536919A1 (en) * 1985-10-17 1987-04-23 Bayerische Motoren Werke Ag Device for changing the relative rotational position of a driven machine component with respect to a driving machine component, in particular of a control shaft with respect to a crank shaft of an internal combustion engine
EP0399991A1 (en) * 1989-05-24 1990-11-28 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Process and device for controlling the movement of a hydraulically actuated valve
NL1013811C2 (en) * 1999-12-09 2000-11-28 Prometheus Engineering B V Hydraulic valve actuation mechanism.
US6338320B1 (en) * 1998-09-09 2002-01-15 International Truck & Engine Corporation Hydraulically-assisted engine valve actuator
EP1128029A3 (en) * 2000-02-12 2002-11-13 Adam Opel Ag Variable valve drive for an internal combustion engine
EP1375843A1 (en) * 2002-06-28 2004-01-02 AVL List GmbH Internal combustion engine
DE102012214645A1 (en) * 2012-08-17 2014-02-20 Mahle International Gmbh Internal combustion engine installed in commercial vehicle, has hydraulic actuator that is provided with pistons that are provided for moving valve that is controlled using rotating cam shafts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR432425A (en) * 1911-07-21 1911-12-06 Bachrich Et Cie Soc Remote organ control system using liquid agents
FR471102A (en) * 1913-10-02 1914-10-15 Ettore Bugatti Hydraulic motor control with adjusting piston forming compensator
GB313231A (en) * 1928-03-21 1929-06-13 Thomas Henry Wintringham Improvements in driving gear for use with internal combustion engines
FR2436255A1 (en) * 1978-09-16 1980-04-11 Maschf Augsburg Nuernberg Ag HYDRAULIC DEVICE FOR CONTROLLING VALVES CONTROLLING THE GAS PASSAGE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR432425A (en) * 1911-07-21 1911-12-06 Bachrich Et Cie Soc Remote organ control system using liquid agents
FR471102A (en) * 1913-10-02 1914-10-15 Ettore Bugatti Hydraulic motor control with adjusting piston forming compensator
GB313231A (en) * 1928-03-21 1929-06-13 Thomas Henry Wintringham Improvements in driving gear for use with internal combustion engines
FR2436255A1 (en) * 1978-09-16 1980-04-11 Maschf Augsburg Nuernberg Ag HYDRAULIC DEVICE FOR CONTROLLING VALVES CONTROLLING THE GAS PASSAGE

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3536919A1 (en) * 1985-10-17 1987-04-23 Bayerische Motoren Werke Ag Device for changing the relative rotational position of a driven machine component with respect to a driving machine component, in particular of a control shaft with respect to a crank shaft of an internal combustion engine
EP0399991A1 (en) * 1989-05-24 1990-11-28 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Process and device for controlling the movement of a hydraulically actuated valve
US6338320B1 (en) * 1998-09-09 2002-01-15 International Truck & Engine Corporation Hydraulically-assisted engine valve actuator
NL1013811C2 (en) * 1999-12-09 2000-11-28 Prometheus Engineering B V Hydraulic valve actuation mechanism.
WO2001021939A2 (en) 1999-12-09 2001-03-29 Prometheus Engineering B.V. Hydraulic valve-operating mechanism
WO2001021939A3 (en) * 1999-12-09 2001-10-25 Prometheus Engineering B V Hydraulic valve-operating mechanism
US6595170B2 (en) 1999-12-09 2003-07-22 Prometheus Engineering B.V. Hydraulic valve-operating mechanism
EP1128029A3 (en) * 2000-02-12 2002-11-13 Adam Opel Ag Variable valve drive for an internal combustion engine
EP1375843A1 (en) * 2002-06-28 2004-01-02 AVL List GmbH Internal combustion engine
DE102012214645A1 (en) * 2012-08-17 2014-02-20 Mahle International Gmbh Internal combustion engine installed in commercial vehicle, has hydraulic actuator that is provided with pistons that are provided for moving valve that is controlled using rotating cam shafts

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Publication number Publication date
FR2480854B1 (en) 1984-05-25

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