EP0115996A1 - Cam drive device, especially for valves of internal combustion engines - Google Patents

Cam drive device, especially for valves of internal combustion engines Download PDF

Info

Publication number
EP0115996A1
EP0115996A1 EP84400209A EP84400209A EP0115996A1 EP 0115996 A1 EP0115996 A1 EP 0115996A1 EP 84400209 A EP84400209 A EP 84400209A EP 84400209 A EP84400209 A EP 84400209A EP 0115996 A1 EP0115996 A1 EP 0115996A1
Authority
EP
European Patent Office
Prior art keywords
valve control
control device
valve
cam
oil bath
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
EP84400209A
Other languages
German (de)
French (fr)
Other versions
EP0115996B1 (en
Inventor
Jean-Pierre Rivere
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
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0115996A1 publication Critical patent/EP0115996A1/en
Application granted granted Critical
Publication of EP0115996B1 publication Critical patent/EP0115996B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/106—Oil reservoirs
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • 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
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20—SOHC [Single overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings

Definitions

  • the present invention relates to a valve control device, in particular in an overhead camshaft engine, of the type comprising a rotary cam and transmission means cooperating with this cam to communicate to a valve, an alternating movement of lifted, against the force exerted by a return spring ensuring the fallout of the valve.
  • the dispensing valves are commonly controlled either directly by a cam via a pusher, or by a rocker, itself controlled by a cam or by a rod.
  • An essential aim of the present invention consists in overcoming the aforementioned drawbacks by a particular arrangement of the valve control members for an internal combustion engine.
  • the object of the invention is a valve control device of the aforementioned type in which, according to a feature of the invention, the sliding surface of the transmission means coming into contact with the cam remains immersed in an oil bath independent lubrication with high viscosity
  • This arrangement allows separate lubrication of the valve control device by bubbling in viscous oil.
  • a double condition of cleanliness and reduction of friction can thus be ensured because the high viscosities favor the formation of an oil film between the cam and the transmission means such as a rocker arm and a pusher.
  • valve control device also makes it possible not to lose a gain in friction by the use of an auxiliary oil pump of high performance.
  • the aforementioned transmission means consist of a rocker arm pivoting in its middle on a rocker shaft and provided around its pivot axis with grooves which open into the independent oil bath.
  • the rocker shaft can thus be permanently lubricated by bubbling.
  • the aforementioned transmission means consist of a pusher immersed in a bath of upper viscous oil. It is a variant for a direct valve attack which allows the above advantages to be preserved.
  • valves 2 In a cylinder head 1 of an internal combustion engine represented in FIG. 1, are essentially associated in a manner known per se, valves 2, housings 3 of spark plugs, a coolant 4, valve guides 5 provided with seals 6, return springs 7, cups 8, screws 9 for adjusting the play, rocker arms 10 mounted on rocker shafts 11, control cams 12.
  • a cylinder head cover 13 provided with cooling fins 14 covers this cylinder head 1 which contains a viscous oil bath 15 for lubrication thermally insulated from this cylinder head by a coating 17.
  • the rocker arms 10 each have a lower part 10 provided with a shoe 10 2 and embedded in the oil bath 15; each of these rockers pivots in its middle on a shaft 11 and has around its pivot axis, a circular groove 10 which opens towards the bottom of the bath 15 in a lower channel 10 40
  • a variant shown in Figures 2 and 3 relates to an overhead valve control by overhead camshaft with direct valve attacks.
  • the cam nose 12 1 projects oil by centrifugation into the groove 10 3 of the rocker arm 10 via the lower channel 10 4 and thus makes it possible to continuously lubricate the shaft 11 of the rocker arm Simultaneously, the projections of oil 1 6 external to the oil bath 1 5 are sufficient to lubricate the contact surface between the valve 2 and the screw 9 for adjusting the clearance.
  • the coating 1 7 constituted either by an insulating material, for example plastic, or by a blade of air taken in particular between two walls, makes it possible to maintain a sufficient viscosity of the oil of the bath 1 5 when hot. This thermal insulation limits the heat flow which comes from the cylinder head 1 and heats the oil of the bath 1 5.
  • the cooling fins 1 4 of the cylinder head cover 13 contribute to evacuating the heat flow produced by the friction of the distribution.
  • the temperature rise of the lubricating oil is thus effectively limited.
  • the viscous oil of the bath 3 1 rises successively through the channel 30, the groove 28 and the hole 27 in the oil ramp formed by the internal bore 25 of the camshaft 24. This oil then feeds through holes 26 judiciously drilled in the cams 2 3, the upper oil bath 21 before the pushers 22 attack by the sides of these cams. The viscous oil may then fall back into the lower bath 31 serving as a reservoir for closing the lubrication circuit of the distribution.
  • the seals 39 mounted on the valve guides 36 limit at best the consumption of oil and a thermally insulating material can separate the oil baths 21 and 31 from the cylinder head 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Dispositif de commande de soupape du type comportant une came rotative (12) et des moyens de transmission (10) coopérant avec cette came pour communiquer à une soupape (2) un mouvement alternatif de levée, à l'encontre de la force exercée par un ressort de rappel (7) assurant la retombée de la soupape (2). Suivant l'invention, la surface de glissement des moyens de transmission (10) entrant en contact avec la came (12) reste immergée dans un bain d'huile de lubrification (15) indépendant présentant une viscosité élevée. Application: notamment à un dispositif de distribution à frottements réduits pour moteurs à combustion interne.Valve control device of the type comprising a rotary cam (12) and transmission means (10) cooperating with this cam to communicate to a valve (2) an alternating lifting movement, against the force exerted by a return spring (7) ensuring the fall of the valve (2). According to the invention, the sliding surface of the transmission means (10) coming into contact with the cam (12) remains immersed in an independent lubricating oil bath (15) having a high viscosity. Application: in particular to a distribution device with reduced friction for internal combustion engines.

Description

La présente invention se rapporte à un dispositif de commande de soupape, en particulier dans un moteur à arbre à cames en tête, du type comportant une came rotative et des moyens de transmission coopérant avec cette came pour communiquer à une soupape, un mouvement alternatif de levée, à l'encontre de la force exercée par un ressort de rappel assurant la retombée de la soupape. Les soupapes de distribution sont couramment commandées soit directement par une came par l'intermédiaire d'un poussoir, soit par un culbuteur, lui-même commandé par une came ou par une tige.The present invention relates to a valve control device, in particular in an overhead camshaft engine, of the type comprising a rotary cam and transmission means cooperating with this cam to communicate to a valve, an alternating movement of lifted, against the force exerted by a return spring ensuring the fallout of the valve. The dispensing valves are commonly controlled either directly by a cam via a pusher, or by a rocker, itself controlled by a cam or by a rod.

Ces différentes solutions nécessitent en particulier un graissage par alimentation sous pression d'huile ; cette huile doit présenter une viscosité compatible avec le fonctionnement des autres organes du moteur à combustion interne et notamment des paliers pour lesquels cette viscosité doit de préférence rester faible.These different solutions require in particular lubrication by feeding under oil pressure; this oil must have a viscosity compatible with the functioning of the other organs of the internal combustion engine and in particular of the bearings for which this viscosity must preferably remain low.

Mais une faible viscosité perturbe notamment le fonctionnement de la came par :

  • - des frottements élevés dus à une épaisseur extrêmement faible du film d'huile situé entre la came et le culbuteur ou le poussoir et à l'instabilité de ce film ; le couple d'entraînement de l'arbre à cames peut alors devenir très pénalisant pour les petites cylindrées ;
  • - des usures importantes, accélérées par la présence de déchets de combustion faisant office de grains abrasifs.
However, a low viscosity interferes in particular with the operation of the cam by:
  • - high friction due to an extremely small thickness of the oil film located between the cam and the rocker arm or the plunger and to the instability of this film; the driving torque of the camshaft can then become very detrimental for small displacements;
  • - significant wear, accelerated by the presence of combustion waste acting as abrasive grains.

Un but essentiel de la présente invention consiste à remédier aux inconvénients précités par une disposition particulière des organes de commande de soupapes pour un moteur à combustion interne.An essential aim of the present invention consists in overcoming the aforementioned drawbacks by a particular arrangement of the valve control members for an internal combustion engine.

L'objet de l'invention est un dispositif de commande de soupape du type précité dans lequel, suivant une particularité de l'invention, la surface de glissement des moyens de transmission entrant en contact avec la came reste immergée dans un bain d'huile de lubrification indépendant présentant une viscosité élevéeThe object of the invention is a valve control device of the aforementioned type in which, according to a feature of the invention, the sliding surface of the transmission means coming into contact with the cam remains immersed in an oil bath independent lubrication with high viscosity

Cette disposition permet une lubrification séparée du dispositif de commande de soupape.par barbotage en huile visqueuse..This arrangement allows separate lubrication of the valve control device by bubbling in viscous oil.

Une double condition de propreté et de réduction des frottements peut ainsi être assurée car les hautes viscosités favorisent la formation d'un film d'huile entre la came et les moyens de transmission tels qu'un culbuteur et un poussoir.A double condition of cleanliness and reduction of friction can thus be ensured because the high viscosities favor the formation of an oil film between the cam and the transmission means such as a rocker arm and a pusher.

En effet, des essais ont montré que le couple d'entraînement du dispositif de commande de soupape est réduit de moitié avec une lubrification très visqueuse, située notamment dans une plage de 200 à 1 000 centipoises.In fact, tests have shown that the driving torque of the valve control device is reduced by half with a very viscous lubrication, situated in particular in a range from 200 to 1000 centipoise.

Le dispositif de commande de soupape conforme à l'invention permet aussi de ne pas perdre un gain de frottement par l'emploi d'une pompe à huile auxiliaire de performances élevées. Suivant une autre particularité de l'invention, les moyens de transmission précités sont constitués par un culbuteur pivotant en son milieu sur un arbre de culbuteur et pourvu autour de son axe de pivotement de saignées qui débouchent dans le bain d'huile indépendant.The valve control device according to the invention also makes it possible not to lose a gain in friction by the use of an auxiliary oil pump of high performance. According to another particular feature of the invention, the aforementioned transmission means consist of a rocker arm pivoting in its middle on a rocker shaft and provided around its pivot axis with grooves which open into the independent oil bath.

L'arbre de culbuteur peut ainsi être lubrifié en permanence par barbotage.The rocker shaft can thus be permanently lubricated by bubbling.

Suivant une autre particularité de l'invention, les moyens de transmission précités sont constitués par un poussoir immergé dans un bain d'huile visqueuse supérieur. Il s'agit d'une variante pour une attaque directe de soupapes qui permet de conserver les avantages précédents.According to another feature of the invention, the aforementioned transmission means consist of a pusher immersed in a bath of upper viscous oil. It is a variant for a direct valve attack which allows the above advantages to be preserved.

L'invention sera mieux comprise et d'autres buts, détails et avantages de celle-ci apparaîtront au cours de la description explicative qui suit, en se reportant aux dessins schématiques annexés, donnés uniquement à titre d'exemples illustrant deux modes de réalisation de l'invention et dans lesquels :

  • - la figure 1 représente une vue en coupe partielle transversale d'une tête de cylindre d'un moteur à combustion interne, avec une commande de soupape à came conforme à l'invention par came et culbuteur,
  • - la figure 2 est une vue en coupe partielle longitudinale d'une tête de cylindre d'un moteur à combustion interne, avec une commande de soupape à came conforme à l'invention par came et poussoir,
  • - et la figure 3 est une vue en coupe partielle de la figure 2 suivant 3 - 3.
The invention will be better understood and other objects, details and advantages thereof will appear during the explanatory description which follows, with reference to the appended schematic drawings, given solely by way of examples illustrating two embodiments of the invention and in which:
  • FIG. 1 represents a partial cross-sectional view of a cylinder head of an internal combustion engine, with a cam valve control according to the invention by cam and rocker arm,
  • FIG. 2 is a view in partial longitudinal section of a cylinder head of an internal combustion engine, with a cam valve control according to the invention by cam and plunger,
  • - And Figure 3 is a partial sectional view of Figure 2 along 3 - 3.

A une culasse 1 d'un moteur à combustion interne représentée à la figure 1, sont essentiellement associés de façon connue en soi, des soupapes 2, des logements 3 de bougies d'allumage, un fluide de refroidissement 4, des guides de soupape 5 munis de joints d'étanchéité 6, des ressorts de rappel 7, des coupelles 8, des vis 9 de réglage de jeu, des culbuteurs 10 montés sur des arbres de culbuteur 11, des cames de commande 12.In a cylinder head 1 of an internal combustion engine represented in FIG. 1, are essentially associated in a manner known per se, valves 2, housings 3 of spark plugs, a coolant 4, valve guides 5 provided with seals 6, return springs 7, cups 8, screws 9 for adjusting the play, rocker arms 10 mounted on rocker shafts 11, control cams 12.

Un couvre-culasse 13 muni d'ailettes de refroidissement 14 recouvre cette culasse 1 qui contient un bain d'huile visqueuse 15 de lubrification thermiquement isolé de cette culasse par un revêtement 17.A cylinder head cover 13 provided with cooling fins 14 covers this cylinder head 1 which contains a viscous oil bath 15 for lubrication thermally insulated from this cylinder head by a coating 17.

Les culbuteurs 10 présentent chacun une partie basse 10 munie d'un patin 102 et noyée dans le bain d'huile 15 ; chacun de ces culbuteurs pivote en son milieu sur un arbre 11 et présente autour de son axe de pivotement, une gorge circulaire 10 qui débouche vers le fond du bain 15 dans un canal inférieur 1040 Une variante représentée aux figures 2 et 3 est relative à une commande de soupapes en tête par arbre à cames en tête à attaques directes des soupapes.The rocker arms 10 each have a lower part 10 provided with a shoe 10 2 and embedded in the oil bath 15; each of these rockers pivots in its middle on a shaft 11 and has around its pivot axis, a circular groove 10 which opens towards the bottom of the bath 15 in a lower channel 10 40 A variant shown in Figures 2 and 3 relates to an overhead valve control by overhead camshaft with direct valve attacks.

Sur ces figures sont représentés :

  • - une culasse 20 pourvue d'un bain d'huile visqueuse supérieur 21 dans lequel sont immergés des poussoirs 22 attaqués par des cames 23 ;
  • - un arbre à cames 24 muni d'un alésage interne 25 qui communique par des trous 26 judicieusement pratiqués dans les cames 23 avec le bain d'huile supérieur 21 d'une part, et par un trou traversant 27, une gorge intérieure 28 d'un palier 29 et un canal d'alimentation 30 débouchant dans la gorge 28, avec un bain d'huile visqueuse inférieur 31 ;
  • - une pompe à huile sous basse pression 32 entraîné par l'arbre à cames 24 par l'intermédiaire d'un ensemble de pignons 33 ;
  • - et de façon conventionnelle, des soupapes 34, des ressorts de rappel 35 de soupape, des guides de soupape 36, des coupelles d'attaque 37 de soupape, des pastilles 38 de poussoir assurant le contact avec les cames 23 et des joints d'étanchéité à l'huile 39 montés sur les guides 36.
In these figures are represented:
  • - A cylinder head 20 provided with a viscous upper oil bath 21 in which are immersed pushers 22 attacked by cams 23;
  • - A camshaft 24 provided with an internal bore 25 which communicates through holes 26 judiciously made in the cams 23 with the upper oil bath 21 on the one hand, and through a through hole 27, an internal groove 28 d 'a bearing 29 and a supply channel 30 opening into the groove 28, with a lower viscous oil bath 31;
  • - a low pressure oil pump 32 driven by the camshaft 24 via a set of pinions 33;
  • - And in a conventional manner, valves 34, valve return springs 35, valve guides 36, valve actuating cups 37, pusher pads 38 ensuring contact with the cams 23 and gaskets. oil tightness 39 mounted on the guides 36.

Le dispositif de commande de soupape précédemment décrit fonctionne de la manière suivante :

  • Comme le montre la figure 1, la partie basse 101 du culbuteur 10 est entièrement noyée dans l'huile du bain 15 ; par conséquent, la lubrification de la surface de glissement de ce culbuteur entrant en contact par le patin 102 avec la came de commande 12 partiellement immergée est assurée en permanenceo
The previously described valve control device operates as follows:
  • As shown in Figure 1, the lower part 10 1 of the rocker arm 10 is completely embedded in the oil of the bath 15; therefore, the lubrication of the sliding surface of this rocker arm coming into contact with the shoe 10 2 with the partially submerged control cam 12 is ensured permanently.

Le nez de came 121 projette de l'huile par centrifugation dans la gorge 10 3 du culbuteur 10 par l'intermédiaire du canal inférieur 10 4 et permet ainsi de lubrifier continuellement l'arbre 11 de cul- buteuro Simultanément, les projections d'huile 16 extérieures au bain d'huile 15 suffisent à lubrifier la surface de contact entre la soupape 2 et la vis 9 de règlage de jeu. Le revêtement 17 constitué, soit par un matériau isolant par exemple plastique, soit par une lame d'air prise notamment entre deux parois, permet de conserver une viscosité suffisante de l'huile du bain 15 à chaud. Cette isolation thermique limite le flux de chaleur qui provient de la culasse 1 et chauffe l'huile du bain 15. De plus, les ailettes de refroidissement 14 du couvre-culasse 13 contribuent à évacuer le flux de chaleur dégagée par le frottement de la distribution.The cam nose 12 1 projects oil by centrifugation into the groove 10 3 of the rocker arm 10 via the lower channel 10 4 and thus makes it possible to continuously lubricate the shaft 11 of the rocker arm Simultaneously, the projections of oil 1 6 external to the oil bath 1 5 are sufficient to lubricate the contact surface between the valve 2 and the screw 9 for adjusting the clearance. The coating 1 7 constituted either by an insulating material, for example plastic, or by a blade of air taken in particular between two walls, makes it possible to maintain a sufficient viscosity of the oil of the bath 1 5 when hot. This thermal insulation limits the heat flow which comes from the cylinder head 1 and heats the oil of the bath 1 5. In addition, the cooling fins 1 4 of the cylinder head cover 13 contribute to evacuating the heat flow produced by the friction of the distribution.

La montée en température de l'huile de lubrification est ainsi limitée de manière efficace.The temperature rise of the lubricating oil is thus effectively limited.

Dans la variante représentée sur les figures 2 et 3, une circulation d'huile fortement visqueuse avec le bain supérieur 21 indépendant et alimenté par le bain d'huile inférieur 31 servant de réservoir, par l'intermédiaire de la pompe sous basse pression 32 permet d'assurer en permanence la lubrification des surfaces de glissement des poussoirs 22 entrant en contact avec les cames 23 par les pastilles 38.In the variant shown in FIGS. 2 and 3, a highly viscous oil circulation with the upper bath 21 independent and supplied by the lower oil bath 3 1 serving as a reservoir, by means of the low pressure pump 32 allows permanent lubrication of the sliding surfaces of the pushers 22 coming into contact with the cams 23 by the pads 38.

Sous l'action de la pompe sous basse pression 32, l'huile visqueuse du bain 31 remonte successivement par le canal 30, la gorge 28 et le trou 27 dans la rampe d'huile constituée par l'alésage interne 25 de l'arbre à cames 24. Cette huile alimente ensuite au-travers des trous 26 judicieusement percés dans les cames 23, le bain d'huile supérieur 21 avant l'attaque des poussoirs 22 par les flancs de ces cames. L'huile visqueuse est susceptible de retomber ensuite dans le bain inférieur 31 servant de réservoir pour boucler le circuit de lubrification de la distribution.Under the action of the low pressure pump 32, the viscous oil of the bath 3 1 rises successively through the channel 30, the groove 28 and the hole 27 in the oil ramp formed by the internal bore 25 of the camshaft 24. This oil then feeds through holes 26 judiciously drilled in the cams 2 3, the upper oil bath 21 before the pushers 22 attack by the sides of these cams. The viscous oil may then fall back into the lower bath 31 serving as a reservoir for closing the lubrication circuit of the distribution.

Comme pour la commande de soupapes par culbuteurs et cames, les joints d'étanchéité 39 montés sur les guides de soupape 36 limitent au mieux la consommation d'huile et un matériau thermiquement isolant peut séparer les bains d'huile 21 et 31 de la culasse 20.As for valve control by rocker arms and cams, the seals 39 mounted on the valve guides 36 limit at best the consumption of oil and a thermally insulating material can separate the oil baths 21 and 31 from the cylinder head 20.

Afin de rendre compatible l'utilisation d'huiles à fortes viscosités avec le bon fonctionnement des paliers d'arbre à cames et réduire ainsi les frottements de façon optimale, une solution simple consiste à se servir de paliers usuels à arcs partiels.In order to make compatible the use of oils with high viscosities with the correct functioning of the camshaft bearings and thus reduce friction in an optimal way, a simple solution consists in using usual bearings with partial arcs.

Claims (8)

1. Dispositif de commande de soupape, notamment dans un moteur à arbres à cames en tête, du type comportant une came rotative (12,23) et des moyens de transmission (10,22) coopérant avec cette came pour communiquer à une soupape (2,34) un mouvement alternatif de levée, à l'encontre de la force exercée par un ressort de rappel (7,35) assurant la retombée de la soupape (2, 34), caractérisé en ce que la surface de glissement desdits moyens de transmission (10, 22) entrant en contact avec ladite came (12, 23) reste immergée dans un bain d'huile de lubrification (15, 21) indépendant présentant une viscosité élevée. 1 . Valve control device, in particular in an overhead camshaft engine, of the type comprising a rotary cam (12, 2 3) and transmission means ( 1 0.22) cooperating with this cam to communicate with a valve ( 2.34) an alternating lifting movement, against the force exerted by a return spring (7.35) ensuring the fall of the valve (2, 34), characterized in that the sliding surface of said means transmission (10, 22) coming into contact with said cam ( 1 2, 23) remains immersed in an independent lubricating oil bath ( 1 5, 2 1 ) having a high viscosity. 2. Dispositif de commande de soupape selon la revendication 1, caractérisé en ce que ledit bain d'huile de lubrification (15, 21) présente une viscosité de 200 à 1000 centipoises.2. A valve control apparatus according to claim 1, characterized in that said lubricating oil bath (15, 2 1) has a viscosity of 2 0 0 1 000 centipoise. 3. Dispositif de commande de soupape selon l'une quelconque des revendications 1 et 2, caractérisé en ce que lesdits moyens de transmission sont constitués par un culbuteur (10) pivotant en son milieu sur un arbre (11) de culbuteur et pourvu autour de son axe de pivotement, de saignées (10 3, 104) qui débouchent dans ledit bain d'huile (15) pour le graissage par centrifugation dudit arbre (11) de culbuteur.3. A valve control device according to any one of claims 1 and 2, characterized in that said transmission means consist of a rocker arm (10) pivoting in its middle on a rocker shaft (11) and provided around its pivot axis, grooves ( 10 3 , 1 0 4 ) which open into said oil bath (15) for the centrifugal lubrication of said rocker arm ( 11 ). 4. Dispositif de commande de soupape selon l'une quelconque des revendications 1 et 2, caractérisé en ce que lesdits moyens de transmission sont constitués par un poussoir (22) immergé dans un bain d'huile visqueuse (21) supérieur.4. A valve control device according to any one of claims 1 and 2, characterized in that said transmission means consist of a pusher (22) immersed in a viscous oil bath (21) above. 5. Dispositif de commande de soupape selon la revendication 4, caractérisé en ce que ledit bain supérieur (21) est alimenté à partir d'un bain d'huile inférieur (31) par l'intermédiaire d'une pompe sous basse pression (32), d'un canal (30) et d'une gorge (28) pratiqués dans un palier (29) d'arbre à cames (24), d'un trou (27) traversant cet arbre à cames et débouchant dans un alésage interne (25) formant rampe d'huile, et de trous (26) judicieusement percés dans les cames (23) dudit arbre (24).5. A valve control device according to claim 4, characterized in that said upper bath (21) is supplied from a lower oil bath (31) by means of a low pressure pump (32 ), a channel (30) and a groove (28) formed in a camshaft bearing (29) (24), a hole (27) passing through this camshaft and opening into a bore internal (25) forming an oil ramp, and holes (26) judiciously drilled in the cams (23) of said tree (24). 6. Dispositif de commande de soupape selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'un matériau thermiquement isolant (17) sépare ledit bain d'huile indépendant (15, 21, 31) de ladite culasse (1, 20).6. Valve control device according to any one of claims 1 to 5, characterized in that a thermally insulating material (17) separates said independent oil bath (15, 21, 31) from said cylinder head (1, 20). 7. Dispositif de commande de soupape selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'arbre à cames (24) correspondant à ladite came (12, 23) tourne dans des paliers à arcs partiels pour réduire le frottement de ceux-ci en huile visqueuse.7. Valve control device according to any one of claims 1 to 6, characterized in that the camshaft (24) corresponding to said cam (12, 23) rotates in bearings with partial arcs to reduce friction of these in viscous oil. 8. Dispositif de commande de soupape selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'un joint d'étanchéité (6, 39) est monté sur la guide (5, 36) de ladite soupape (2, 34) pour réduire la consommation d'huileo8. Valve control device according to any one of claims 1 to 7, characterized in that a seal (6, 39) is mounted on the guide (5, 36) of said valve (2, 34 ) to reduce oil consumption
EP84400209A 1983-02-03 1984-01-31 Cam drive device, especially for valves of internal combustion engines Expired EP0115996B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8301676 1983-02-03
FR8301676A FR2540553A1 (en) 1983-02-03 1983-02-03 CAM CONTROL DEVICE, IN PARTICULAR FOR VALVES OF INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0115996A1 true EP0115996A1 (en) 1984-08-15
EP0115996B1 EP0115996B1 (en) 1986-11-12

Family

ID=9285564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400209A Expired EP0115996B1 (en) 1983-02-03 1984-01-31 Cam drive device, especially for valves of internal combustion engines

Country Status (5)

Country Link
US (1) US4565168A (en)
EP (1) EP0115996B1 (en)
DE (1) DE3461322D1 (en)
ES (1) ES8407551A1 (en)
FR (1) FR2540553A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777842A (en) * 1985-01-29 1988-10-18 Toyota Jidosha Kabushiki Kaisha Structure of camshaft bearing
EP0418513A2 (en) * 1989-09-19 1991-03-27 MECCANOTECNICA S.p.A. A booksewing thread stitcher machine

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62500675A (en) * 1984-10-29 1987-03-19 バイエリッシェ　モ−ト−レン　ウエルケ　アクチエンゲゼルシャフト Valve housing for cylinder heads of internal combustion engines with gas exchange valves substantially parallel to each other
US4856466A (en) * 1988-09-28 1989-08-15 Ford Motor Company Lubricant retaining finger-follower rocker arm
US4991549A (en) * 1989-12-08 1991-02-12 Yamaha Hatsudoki Kabushiki Kaisha Camshaft lubricating system for engine
FR2683262B1 (en) * 1991-11-06 1995-02-03 Smh Management Services Ag INTERNAL COMBUSTION ENGINE WITH OIL PUMP ON THE CAMSHAFT.
US5778841A (en) * 1997-02-26 1998-07-14 Cummins Engine Company, Inc. Camshaft for internal combustion engines
US6782856B2 (en) 2002-04-09 2004-08-31 Ford Global Technologies, Llc Camshaft accumulator
FR2848276B1 (en) * 2002-12-05 2005-02-11 Renault Sa DEVICE FOR COUPLING A ROTATING MEMBER TO A CAMSHAFT
DE102006043090A1 (en) * 2006-09-14 2008-03-27 Robert Bosch Gmbh Camshaft drive, in particular for a diesel injection pump, with a liftable driven roller
US20130301963A1 (en) * 2012-05-11 2013-11-14 GM Global Technology Operations LLC Automotive powertrain component and bearing with micropores, and method thereof
DE102012222752A1 (en) 2012-12-11 2014-06-12 Mahle International Gmbh bearing arrangement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1469063A (en) * 1920-11-12 1923-09-25 Wills Childe Harold Oil-feeding means
FR602018A (en) * 1924-11-17 1926-03-11 Lubricating device for overhead valve engine distributions
FR621244A (en) * 1926-09-10 1927-05-07 Lubricating the valve gear of top-operated combustion engines
DE2415829A1 (en) * 1973-05-02 1974-11-21 Ford Werke Ag TOP-CONTROLLED VALVE ACTUATING DEVICE FOR A COMBUSTION ENGINE
FR2457388A1 (en) * 1979-05-23 1980-12-19 Fiat Veicoli Ind CYLINDER HEAD FOR INTERNAL COMBUSTION COMPRESSION IGNITION ENGINES
FR2508995A1 (en) * 1981-07-03 1983-01-07 Ford France CAMSHAFT SUPPORT AND METHOD OF MOUNTING THE SHAFT IN THE HOLDER

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1264494A (en) * 1917-03-28 1918-04-30 Theodore Livinus Reepmaker D Orville Lubricating system for internal-combustion engines.
US1403540A (en) * 1918-03-22 1922-01-17 Packard Motor Car Co Hydrocarbon motor
US1469155A (en) * 1922-01-31 1923-09-25 Hedberg Roy Edgar Valve rocker arm
US1617845A (en) * 1922-05-13 1927-02-15 Elbert J Hall Lubricating and cooling system for internal-combustion engines
US1993992A (en) * 1932-11-21 1935-03-12 Ford Motor Co Internal combustion engine
US3045656A (en) * 1959-08-21 1962-07-24 Renault Engine valve operation
US3605706A (en) * 1969-12-12 1971-09-20 Microdot Inc Valve stem oil deflector
US3788295A (en) * 1972-12-11 1974-01-29 Ford Motor Co Valve stem oil seal and lubricator
JPS5627015A (en) * 1979-08-10 1981-03-16 Nissan Motor Co Ltd Diesel engine of light-oil lubrication type

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1469063A (en) * 1920-11-12 1923-09-25 Wills Childe Harold Oil-feeding means
FR602018A (en) * 1924-11-17 1926-03-11 Lubricating device for overhead valve engine distributions
FR621244A (en) * 1926-09-10 1927-05-07 Lubricating the valve gear of top-operated combustion engines
DE2415829A1 (en) * 1973-05-02 1974-11-21 Ford Werke Ag TOP-CONTROLLED VALVE ACTUATING DEVICE FOR A COMBUSTION ENGINE
FR2457388A1 (en) * 1979-05-23 1980-12-19 Fiat Veicoli Ind CYLINDER HEAD FOR INTERNAL COMBUSTION COMPRESSION IGNITION ENGINES
FR2508995A1 (en) * 1981-07-03 1983-01-07 Ford France CAMSHAFT SUPPORT AND METHOD OF MOUNTING THE SHAFT IN THE HOLDER

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WOLF-DIETER FRANKE: "Schmierstoffe und ihre Anwendung", 1971, Carl Hanser Verlag, München, DE *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777842A (en) * 1985-01-29 1988-10-18 Toyota Jidosha Kabushiki Kaisha Structure of camshaft bearing
EP0418513A2 (en) * 1989-09-19 1991-03-27 MECCANOTECNICA S.p.A. A booksewing thread stitcher machine
EP0418513A3 (en) * 1989-09-19 1991-06-19 Meccanotecnica S.P.A. A booksewing thread stitcher machine

Also Published As

Publication number Publication date
ES528469A0 (en) 1984-09-16
EP0115996B1 (en) 1986-11-12
DE3461322D1 (en) 1987-01-02
US4565168A (en) 1986-01-21
ES8407551A1 (en) 1984-09-16
FR2540553A1 (en) 1984-08-10
FR2540553B1 (en) 1985-05-17

Similar Documents

Publication Publication Date Title
EP0115996B1 (en) Cam drive device, especially for valves of internal combustion engines
FR2542372A1 (en) Rocker arm and its method of manufacture
JP3817716B2 (en) Cam bracket
US6679210B2 (en) Rocker arm for internal combustion engine
JPS61241411A (en) Oil feeding device in internal combustion engine
JP2009215939A (en) Valve stem end lubricating structure
KR100376676B1 (en) Tappet lubricating structure for over head valve type diesel engine
FR2844311A1 (en) Air pump activating equipment comprises four-stroke engine with camshaft in cylinder block and air pump integral with cylinder block having power transmitted to it by belt located between pump drive shaft and camshaft
AU2007306907A1 (en) 4-cycle engine
EP2882943B1 (en) A rotary valve internal combustion engine
JP5322250B2 (en) Valve shaft end lubrication structure
JPH06578Y2 (en) Cylinder head cooling device
KR100444880B1 (en) Cam cap having oil hole
KR100427079B1 (en) Cam shaft
JPH03286109A (en) Valve system of four-cycle engine
KR100440021B1 (en) Balance shaft apparatus
KR19990020867U (en) Camshaft improves lubricity
JP2002054414A (en) Rocker arm
EP3363999A1 (en) Engine
KR100331621B1 (en) A pushing force resistant apparatus of crankshaft
KR100343994B1 (en) Lubrication device for crank shaft
KR100778592B1 (en) The structure of continuously variable valve timing of cam shaft lubrication
KR200158441Y1 (en) Control device for engine oil pressure
KR19990030450U (en) Crankshaft structure with improved lubricity
JP2008069725A (en) Camshaft support structure

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840203

AK Designated contracting states

Designated state(s): DE GB IT NL SE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT NL SE

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

REF Corresponds to:

Ref document number: 3461322

Country of ref document: DE

Date of ref document: 19870102

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911214

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911216

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19911227

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920131

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930801

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19931001

EUG Se: european patent has lapsed

Ref document number: 84400209.7

Effective date: 19930912