EP1979592B1 - Engine block and cylinder head assembly for a variable compression ratio engine - Google Patents

Engine block and cylinder head assembly for a variable compression ratio engine Download PDF

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Publication number
EP1979592B1
EP1979592B1 EP07730868A EP07730868A EP1979592B1 EP 1979592 B1 EP1979592 B1 EP 1979592B1 EP 07730868 A EP07730868 A EP 07730868A EP 07730868 A EP07730868 A EP 07730868A EP 1979592 B1 EP1979592 B1 EP 1979592B1
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EP
European Patent Office
Prior art keywords
cylinder head
engine
cylinder
control
assembly according
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.)
Not-in-force
Application number
EP07730868A
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German (de)
French (fr)
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EP1979592A1 (en
Inventor
Vianney Rabhi
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Individual
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Individual
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Publication of EP1979592A1 publication Critical patent/EP1979592A1/en
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Classifications

    • 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • 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
    • F02F1/00—Cylinders; Cylinder headsĀ 
    • F02F1/24—Cylinder heads
    • 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
    • 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/041—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of cylinder or cylinderhead positioning
    • 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/047—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of variable crankshaft position
    • 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
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/048—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable crank stroke length
    • 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
    • F02F11/00—Arrangements of sealings in combustion enginesĀ 

Definitions

  • the present invention relates to a cylinder head assembly and engine block for variable volumetric ratio engine whose cylinder head is common to the combustion chamber and control cylinders.
  • the mechanical transmission device for a variable volumetric ratio engine comprises at least one cylinder in which a piston moves which is secured, in its lower part, with a transmission member cooperating on the one hand by means of a rack with a small dimension with a rolling guide device, and secondly by means of another large rack with a toothed wheel secured to a connecting rod, this making it possible to transmit the movement between said piston and said connecting rod.
  • the mechanical transmission device for variable volumetric ratio engine also comprises at least one control rack cooperating with the gear wheel, means for fixing the piston on the transmission member which provide a clamping preload, connecting means which allow to stiffen the teeth of the racks, and means for strengthening and lightening the structure of the toothed wheel.
  • the cylinder block is capped with two distinct yokes: one, of a type known per se, comprises valves and their actuating system and closes the upper end of the cylinder of the variable compression ratio engine, another, specific to said engine, serves to close the upper end of the control cylinder of said engine.
  • the fixing of the cylinder head of the control cylinder requires screws whose number and resistance are at least equivalent to those required for the screws of the engine cylinder head because the total effort assumed by said screws of the cylinder head control cylinder is comparable to that assumed by the bolts of the engine cylinder head.
  • control cylinder head is such that it is difficult to accommodate the screws which fix said control cylinder head on the cylinder block.
  • the actuator cylinder head is placed relatively low relative to the cylinder block and the length of said screw is low which reduces their fatigue resistance by increasing the amplitude of the repeated stress to which they are subjected.
  • Another problem stems from the short distance between the cylinder head of the engine and the cylinder head of the control cylinder which makes it difficult to fit into the casing of the cylinder block ducts of appropriate section to ensure the return of the lubricating oil of the cylinder head of the engine to the lubricating oil sump of said engine, on the one hand, and allowing the rise of "blow-by" gases from said housing to the cylinder head on the other hand.
  • the cylinder head and engine block assembly according to the present invention for a variable compression ratio engine comprises a common cylinder head which cooperates with a cylinder block to close on the one hand the end of at least one cylinder of the motor at its combustion chamber, and secondly the end of at least one cylinder of a control cylinder of said motor at the upper chamber of said cylinder, said cylinder housing containing all the components of the movable hitch of the variable volumetric ratio engine, and the cylinder head and engine block assembly according to the present invention comprises stops fixing the limits of the high position and the low position of the control rack which are constituted, on the side of said control rack, a flexible material which covers the upper and lower faces of the control jack piston integral with said rack, said flexible material being able to come into contact with the common cylinder, thus fixing the limit of the upper position of the control rack, or with the cylinder block, thus fixing the limit of the low position of the rack to control.
  • the cylinder head and engine block assembly comprises a common yoke having a single plane of joint which cooperates with a single plane of joint that includes the cylinder block, said joint planes cooperating with at least one joint which allows sealing between said common yoke and said cylinder block.
  • the cylinder head and engine block assembly comprises a common cylinder head having at least one combustion chamber, at least one ignition device and at least two valves and their device which ensures their opening and closing.
  • the cylinder head and engine block assembly comprises a common cylinder head which comprises a chamber arranged at the end of the upper rod of the cylinder or cylinders (s) for controlling the engine, said chamber being connected to an oil inlet under pressure.
  • the cylinder head and engine block assembly comprises a common cylinder head which comprises a chamber arranged at the end of the control rod of the engine control cylinder (s), said chamber being connected to an intake of oil under pressure.
  • the cylinder head and engine block assembly comprises a chamber arranged at the end of the control rod containing a spring which exerts a thrust on the control rod while resting on the bottom of said chamber on the one hand, and on the end of said control rod on the other hand.
  • the cylinder head assembly and engine block according to the present invention comprises a common cylinder head having channels arranged in its mass which connect together the chambers arranged at the end of the upper rods of the control cylinders.
  • the cylinder head assembly and engine block according to the present invention comprises a common cylinder head having channels arranged in its mass which connect together the chambers arranged at the end of the control rods of the control cylinders.
  • the cylinder head and engine block assembly comprises a common cylinder head having channels arranged in its mass which connect the chamber (s) arranged (s) at the end of the upper rod or jack (s) control unit or at the chamber (s) arranged (s) at the end of the control rod of said cylinder (s) control (s).
  • the cylinder head and engine block assembly according to the present invention comprises a common yoke which comprises means for fixing the peripheral members necessary for the operation of the engine and the vehicle on the one hand, and for fixing the engine to the vehicle on the other hand.
  • the cylinder head and engine block assembly comprises a cylinder block having a single plane of joint which cooperates with a joint plane that includes the common yoke, said joint planes for sealing between said common yoke and said cylinder block at the combustion chamber (s) of the engine on the one hand, and in the upper chamber of the cylinder (s) control (s) secondly.
  • the cylinder head and engine block assembly comprises a cylinder block which comprises a control camshaft placed under the engine control cylinder (s) and above the control rack (s). said engine, the control rod (s) of said engine coming to bear on said camshaft.
  • the cylinder head and engine block assembly according to the present invention comprises a control camshaft which is housed in bearings in which it can rotate.
  • the cylinder head and engine block assembly according to the present invention comprises at least one bearing in which rotates the control camshaft whose radius is greater than the largest radius of the cams of said camshaft.
  • the cylinder head and engine block assembly according to the present invention comprises bearings in which the control camshaft rotates which are of different diameters to facilitate mounting of said camshaft.
  • the cylinder head and engine block assembly comprises a control camshaft which comprises a return spring in rotation.
  • the cylinder head and engine block assembly comprises a control camshaft which comprises transmission means for coupling it to an electric motor capable of driving it in rotation.
  • the cylinder head and engine block assembly comprises a cylinder block comprising at least one rocker arm which imposes on the control rod a vertical position as a function of the angular position of the camshaft, and at the end of which said control rod comes to bear, said rod being held in contact with said end of the rocker arm by the spring housed in the chamber arranged at the end of said rod and / or by the hydraulic pressure prevailing in said chamber.
  • the cylinder head assembly and engine block according to the present invention comprises a rocker arm which bears on the cylinder block on the one hand, and on one of the cams of the camshaft on the other hand.
  • the cylinder head and engine block assembly comprises a rocker arm which bears on the cylinder block via a link whose vertical position relative to the cylinder block can be adjusted by means of an adjustment device.
  • the cylinder head and engine block assembly comprises an adjustment device which makes it possible to adjust the vertical position of the connection between the rocker arm and the cylinder block and which consists of a support screwed into said cylinder block which is stopped in rotation by a stop means.
  • the cylinder head and engine block assembly comprises a cylinder block which has stops fixing the limits of the high position and the low position of the control rack and which cooperate with abutments integral with said control rack.
  • the cylinder head assembly and engine block according to the present invention comprises a common yoke which comprises a stop fixing the limit of the upper position of the control rack and which cooperates with an abutment integral with said control rack.
  • the cylinder head and engine block assembly comprises a cylinder block which comprises at least one rectangular window obstructed by a rectangular plate fixed to the cylinder block by screws, and which constitutes the support of a device for rolling the engine.
  • the cylinder head assembly and engine block according to the present invention comprises a cylinder block which comprises means for fixing the peripheral members necessary for the operation of the engine and the vehicle on the one hand, and for fixing the engine to the vehicle on the other hand.
  • the cylinder head and engine block assembly comprises a single seal for sealing between the common cylinder head and the cylinder block at the level of the combustion chamber (s) on the one hand, and at the the upper chamber of the cylinder (s) control (s) secondly.
  • the cylinder head and engine block assembly comprises at least one channel which passes through the joint placed between the common cylinder head and the cylinder block and which ensures the passage of the pressurized engine lubricating oil between the cylinder block and the cylinder. common cylinder head.
  • the cylinder head and engine block assembly comprises at least one channel which passes through the joint placed between the common cylinder head and the crankcase. cylinder and which allows the oil which has lubricated the mechanical parts of the common cylinder to descend by gravity into the cylinder block.
  • the cylinder head and engine block assembly comprises at least one channel which passes through the seal placed between the common cylinder head and the cylinder block and which allows the "blow-by" gases present in the cylinder block to go up to the cylinder head common.
  • the cylinder head and engine block assembly comprises at least one channel which passes through the gasket placed between the common cylinder head and the cylinder block and which allows the cooling fluid to flow between the cylinder block water chambers and the chambers. water from the common cylinder head.
  • variable volumetric ratio engine comprises for each cylinder a transmission device 1 and a piston 2.
  • the mechanical transmission device 1 comprises in the lower part of the piston 2 a transmission member 3 secured to said piston and cooperating, on the one hand with a rolling guide device 4, and on the other hand with a toothed wheel 5.
  • the toothed wheel 5 cooperates with a connecting rod 6 connected to a crankshaft 9 in order to carry out the transmission of the movement between the piston 2 and said crankshaft 9.
  • the toothed wheel 5 cooperates opposite the transmission member 3 with another rack called control rack 7 whose vertical position relative to the engine block is controlled by a control device 12.
  • the cylinder head and engine block assembly comprises a common cylinder head 300 which cooperates with a cylinder block 100 to close on the one hand the end of at least one cylinder 110 of the engine, and on the other hand the end of at least a cylinder 112 of a control cylinder 8 of a control device 12 of said engine.
  • the cylinder block 100 contains all the components of the movable hitch of the variable compression ratio engine.
  • the cylinder head and engine block assembly also comprises, below the cylinder block 100, a bearing housing 400 and an oil sump 500.
  • the cylinder head and engine block assembly may also comprise balancing shafts 600 driven in rotation by the crankshaft. 9 via either a notched belt, a chain, or a cascade of gears.
  • the common cylinder head 300, the cylinder block 100, the bearing housing 400 and the oil sump 500 may be made of cast iron or aluminum or magnesium light alloy.
  • the common yoke 300 comprises a single and same plane of joint 301 which cooperates with a single plane of joint 190 that includes the cylinder block 100.
  • the common cylinder head 300 comprises at least one combustion chamber 302, at least one ignition device and at least two valves and their device which ensures their opening and closing.
  • the common cylinder head 300 and the cylinder block 100 respectively comprise means for fixing the peripheral members necessary for the operation of the engine and the vehicle on the one hand, and for fixing the engine to the vehicle on the other hand.
  • Each joint plane 190, 301 cooperates with at least one seal 305 which allows sealing between the common cylinder head 300 and the cylinder block 100 at the combustion chamber (s) 302 of the engine on the one hand and at the level of the upper chamber 121 of the cylinder (s) control (s) 8 on the other hand.
  • the seal between the common cylinder head 300 and the cylinder block 100 is formed by a single seal 305 at the combustion chamber (s) 302 on the one hand, and at the upper chamber 121 of the control cylinder (s) 8 on the other hand.
  • the seal 305 may consist of a graphite-impregnated asbestos sheet or a carbon-based sheet mountable between two sheets of copper, aluminum or steel.
  • the seal 305 may comprise reinforcement means at the edge of the rolls which consist of a metal strapping.
  • the seal 305 may be made of a ribbed metal sheet mounted with a sealant, and may comprise or cooperate with one or more O-rings.
  • the joint 305 common to the common cylinder head 300 and the cylinder block 100 is traversed by at least one channel which ensures the passage of the pressure lubrication oil from the engine between said cylinder block and said common cylinder head.
  • the joint 305 common to the common cylinder head 300 and the cylinder block 100 is traversed by at least one channel which allows the oil which has lubricated the mechanical parts of the common cylinder 300 to descend by gravity into the cylinder block 100.
  • the joint 305 common to the common cylinder head 300 and the cylinder block 100 is traversed by at least one channel which allows the "blow-by" gases present in the cylinder block 100 to go up to the common cylinder head 300.
  • the joint 305 common to the common cylinder head 300 and to the cylinder block 100 is traversed by at least one channel which allows the cooling fluid of the engine to circulate between the water chambers 303 of the cylinder block 100 and the water chambers 304 of the common breech 300.
  • the cylinder block 100 comprises at least one rectangular window 192 obstructed by a rectangular plate, not shown, fixed on the cylinder block 100 by screws, and which forms a support for the raceway and the small racks of the guide device. bearing 4 of the engine.
  • control device 12 of the variable compression ratio engine comprising a control cylinder 8 which consists of an upper cylinder rod 10, a lower cylinder rod 16, a cylinder piston 13 and a rod control 20.
  • the jack piston 13 comprises a peripheral swivel ring 180 which matches the spherical shape of said jack piston.
  • the upper cylinder rod 10 has in its inner part and in its center a non-return valve 185 of leakage compensation whose input is in communication with a chamber 184 formed in the common yoke 300.
  • the outlet of the non-return valve 185 is connected by a duct 187 formed in the jack piston 13 of the control jack 8 allowing the control rod 20 to pass through said piston.
  • the conduit 187 communicates at the level of the control rod 20, via valves 21 held on their seat by a spring 22, either with an upper chamber 121 or with a lower chamber 122 of the control cylinder 8, respectively above and below the piston cylinder 13.
  • the common cylinder head 300 comprises at least a first chamber 184 arranged at the end of the upper rod 10 or the cylinder (s) of control 8 of the engine, said chamber 184 being connected to an oil inlet under pressure.
  • the common cylinder head 300 comprises at least a second chamber 186 arranged at the end of the control rod 20 or cylinder (s) control 8 of the engine, said chamber 20 being connected to a pressurized oil inlet.
  • the second chamber 186 arranged at the end of the control rod 20, contains a spring, not shown, which exerts a thrust on said control rod by bearing on the bottom of said chamber on the one hand, and on the end of said control rod on the other hand.
  • the common yoke 300 may comprise channels arranged in its mass which connect together the first chambers 184 arranged at the end of the upper rods 10 of the control cylinder (s) 8.
  • the common yoke 300 may comprise channels arranged in its mass which connect the second chambers 186 arranged at the end of the control rods 20 of the control jacks 8.
  • the common yoke 300 may comprise channels, not shown, which connect the chamber (s) 184 arranged (s) at the end of the upper rod 10 or cylinder (s) control 8 to the chamber (s) 186 arranged (s) at the end of the control rod 20 of said cylinder (s) control (s) 8.
  • control camshaft 803 which includes the cylinder block 100, which is placed under the control cylinder (s) 8 of the engine and above the control rack or gears 7 of said engine on which bears the control rod (s) 20 of said engine.
  • control camshaft 803 can rotate in bearings 191 or in ball or roller bearings.
  • the cylinder block 100 comprises at least one bearing 191 in which the control camshaft 803 rotates, the radius of said bearing being greater than the largest radius of the cams 804 of said camshaft.
  • the cylinder block 100 includes bearings 191 in which the control camshaft 803 rotates which are of different diameters to facilitate mounting of said camshaft.
  • the cylinder block 100 comprises a control camshaft 803 which comprises a return spring in rotation, not shown.
  • the cylinder block 100 comprises a control camshaft 803 which comprises intermediate transmission means 806 for coupling it to an electric motor 802 capable of rotating said camshaft.
  • the cylinder block 100 comprises at least one rocker 813 which imposes on the control rod 20 a vertical position according to the angular position of the camshaft 803, and the end of which said control rod 20 comes to bear.
  • the control rod 20 is kept in contact with the end of the rocker arm 813 by spring, not shown, housed in the chamber 186 arranged at the end of said rod and / or by the hydraulic pressure prevailing in said chamber.
  • the cylinder block 100 comprises a rocker arm 813 which bears on the cylinder block 100 on the one hand, and on one of the cams 804 of the control camshaft 803 on the other hand.
  • the rocker arm 813 is supported on the cylinder block 100 via a link or a hinge 814 whose vertical position relative to the cylinder block 100 can be fixed by means of an adjusting device 816.
  • the link 814 between the rocker arm 813 and the cylinder block 100 may consist of a ball joint or a pivot connection.
  • the cylinder block 100 comprises an adjusting device 816 which makes it possible to fix the vertical position of the link 814 between the rocker arm 813 and the cylinder block 100.
  • the adjusting device 816 consists of a support screwed into the cylinder block 100 which is stopped in rotation by a stop means which may be, for example, a lock nut, glue, a key or a brake of the type "Nylstop".
  • the cylinder block 100 comprises abutments, not shown, fixing the limits of the high position and the low position of the control rack 7. In this case, the stops of the cylinder block 100 cooperate with other stops integral with the rack. order 7.
  • the common yoke 300 comprises an abutment fixing the limit of the upper position of the control rack 7. In this case the abutment of the common yoke 300 cooperates with an abutment integral with the control rack 7.
  • the stops fixing the limits of the high position and the low position of the control rack 7 are constituted, on the side of said control rack, with a flexible material which covers the upper and lower faces of the cylinder piston 13 of the jack 8 integral with said rack.
  • the abutments made of flexible material can come into contact either with the common yoke 300, thus fixing the limit of the upper position of the control rack 7, or with the cylinder block 100, thus fixing the limit of the lower position of the rack of order 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The assembly has a common cylinder head (300) cooperating with a cylinder housing (100) to close an end of an engine cylinder at the level of a combustion chamber and an end of a cylinder at a level of an upper chamber of an actuating cylinder (8). The cylinder housing contains an assembly of components of a movable coupling system in a variable compression ratio engine. The cylinder head has a joint plane (301) which cooperates with the joint plane (190) comprising the cylinder housing.

Description

La prƩsente invention est relative Ơ un ensemble culasse et bloc moteur pour moteur Ơ rapport volumƩtrique variable dont la culasse est commune Ơ la chambre de combustion et aux vƩrins de commande.The present invention relates to a cylinder head assembly and engine block for variable volumetric ratio engine whose cylinder head is common to the combustion chamber and control cylinders.

On connaĆ®t, d'aprĆØs les brevets internationaux WO98/51911 , WO00/31377 , WO03/008783 appartenant au demandeur, diffĆ©rents dispositifs mĆ©caniques pour moteur Ć  rapport volumĆ©trique variable.We know, according to international patents WO98 / 51911 , WO00 / 31377 , WO03 / 008783 belonging to the applicant, different mechanical devices for variable volumetric ratio engines.

On remarque que le brevet international WO98/51911 au nom du demandeur dƩcrit un dispositif servant Ơ amƩliorer le rendement global des moteurs Ơ combustion interne Ơ pistons utilisƩs Ơ charge et rƩgime variables par adaptation en marche de leur cylindrƩe effective et/ou de leur rapport volumƩtrique.We notice that the international patent WO98 / 51911 on behalf of the applicant describes a device for improving the overall efficiency of piston internal combustion engines used at variable load and speed by adaptation in operation of their effective displacement and / or their volumetric ratio.

On constate que selon les brevets internationaux WO00/31377 et WO03/008783 au nom du demandeur le dispositif de transmission mĆ©canique pour moteur Ć  rapport volumĆ©trique variable comprend au moins un cylindre dans lequel se dĆ©place un piston qui est solidaire, dans sa partie infĆ©rieure, d'un organe de transmission coopĆ©rant d'une part au moyen d'une crĆ©maillĆØre de faible dimension avec un dispositif de guidage Ć  roulement, et d'autre part au moyen d'une autre crĆ©maillĆØre de forte dimension avec une roue dentĆ©e solidaire d'une bielle, ceci permettant de rĆ©aliser la transmission du mouvement entre ledit piston et ladite bielle.We see that according to international patents WO00 / 31377 and WO03 / 008783 on behalf of the applicant, the mechanical transmission device for a variable volumetric ratio engine comprises at least one cylinder in which a piston moves which is secured, in its lower part, with a transmission member cooperating on the one hand by means of a rack with a small dimension with a rolling guide device, and secondly by means of another large rack with a toothed wheel secured to a connecting rod, this making it possible to transmit the movement between said piston and said connecting rod.

Le dispositif de transmission mĆ©canique pour moteur Ć  rapport volumĆ©trique variable comprend Ć©galement au moins une crĆ©maillĆØre de commande coopĆ©rant avec la roue dentĆ©e, des moyens de fixation du piston sur l'organe de transmission qui offrent une prĆ©contrainte de serrage, des moyens de liaison qui permettent de rigidifier les dents des crĆ©maillĆØres, et des moyens de renforcement et d'allĆØgement de la structure de la roue dentĆ©e.The mechanical transmission device for variable volumetric ratio engine also comprises at least one control rack cooperating with the gear wheel, means for fixing the piston on the transmission member which provide a clamping preload, connecting means which allow to stiffen the teeth of the racks, and means for strengthening and lightening the structure of the toothed wheel.

On note que le carter cylindre est coiffĆ© de deux culasses distinctes : l'une, d'un type connu en soi, comporte des soupapes et leur systĆØme d'actionnement et ferme l'extrĆ©mitĆ© supĆ©rieure du cylindre du moteur Ć  rapport volumĆ©trique variable, l'autre, spĆ©cifique audit moteur, sert Ć  fermer l'extrĆ©mitĆ© supĆ©rieure du vĆ©rin de commande dudit moteur.It will be noted that the cylinder block is capped with two distinct yokes: one, of a type known per se, comprises valves and their actuating system and closes the upper end of the cylinder of the variable compression ratio engine, another, specific to said engine, serves to close the upper end of the control cylinder of said engine.

On constate que cet agencement nƩcessite la rƩalisation de deux plans de joint distincts situƩs Ơ des hauteurs diffƩrentes pour chacune des deux culasses ce qui complexifie considƩrablement la rƩalisation du moteur comparativement aux moteurs plus classiques ne comportant qu'un seul plan de joint.It is found that this arrangement requires the realization of two separate joint planes at different heights for each of the two yokes which greatly complicates the realization of the engine compared to more conventional engines having only one joint plane.

On remarque Ʃgalement que la fixation de la culasse du vƩrin de commande nƩcessite des vis dont le nombre et la rƩsistance sont au moins Ʃquivalent Ơ ceux nƩcessaires pour les vis de la culasse du moteur car l'effort total assumƩ par lesdites vis de la culasse du vƩrin de commande est comparable Ơ celui assumƩ par les vis de la culasse du moteur.Note also that the fixing of the cylinder head of the control cylinder requires screws whose number and resistance are at least equivalent to those required for the screws of the engine cylinder head because the total effort assumed by said screws of the cylinder head control cylinder is comparable to that assumed by the bolts of the engine cylinder head.

On note aussi que l'encombrement de la culasse de vƩrin de commande est tel qu'il est difficile de loger les vis qui fixent ladite culasse de vƩrin de commande sur le carter cylindre. En effet, la culasse de vƩrin de commande est placƩe relativement bas par rapport au carter cylindre et la longueur desdites vis est faible ce qui rƩduit leur rƩsistance Ơ la fatigue par augmentation de l'amplitude de la contrainte rƩpƩtƩe Ơ laquelle elles sont soumises.It is also noted that the size of the control cylinder head is such that it is difficult to accommodate the screws which fix said control cylinder head on the cylinder block. Indeed, the actuator cylinder head is placed relatively low relative to the cylinder block and the length of said screw is low which reduces their fatigue resistance by increasing the amplitude of the repeated stress to which they are subjected.

Un autre problĆØme provient de la faible distance entre la culasse du moteur et la culasse du vĆ©rin de commande qui rend difficile l'amĆ©nagement dans la fonderie du carter cylindre des conduits de section appropriĆ©e permettant d'assurer le retour de l'huile de lubrification de la culasse du moteur vers le carter d'huile de lubrification dudit moteur, d'une part, et permettant la remontĆ©e des gaz de Ā« blow-by Ā» depuis ledit carter vers la culasse d'autre part.Another problem stems from the short distance between the cylinder head of the engine and the cylinder head of the control cylinder which makes it difficult to fit into the casing of the cylinder block ducts of appropriate section to ensure the return of the lubricating oil of the cylinder head of the engine to the lubricating oil sump of said engine, on the one hand, and allowing the rise of "blow-by" gases from said housing to the cylinder head on the other hand.

Enfin, du fait de l'espace vertical limitĆ© disponible pour loger la culasse de vĆ©rin de commande entre le ou les vĆ©rin(s) de commande et le systĆØme d'admission ou d'Ć©chappement du moteur, il est difficile de confĆ©rer Ć  ladite culasse de vĆ©rin une rigiditĆ© suffisante pour rĆ©sister aux efforts de pression auxquels elle est soumise, et de loger au-dessus de ladite culasse la tringlerie qui permet de piloter la position verticale des tiges de contrĆ“le du moteur.Finally, because of the limited vertical space available for housing the control cylinder head between the actuator (s) and the engine intake or exhaust system, it is difficult to confer on said cylinder head the cylinder has sufficient rigidity to withstand the pressure forces to which it is subjected, and to house above said cylinder head the linkage which controls the vertical position of the engine control rods.

C'est pour rƩduire de faƧon significative la complexitƩ de rƩalisation du moteur Ơ rapport volumƩtrique variable que l'ensemble culasse et bloc moteur suivant l'invention se distingue de l'art antƩrieur en ce que, selon un mode particulier de rƩalisation :

  • La rĆ©alisation de l'ensemble culasse - bloc moteur est simplifiĆ©e ce qui rĆ©duit son coĆ»t de fabrication ;
  • La rigiditĆ© de l'ensemble culasse - bloc moteur est amĆ©liorĆ©e ;
  • Le nombre de vis nĆ©cessaire pour fermer l'extrĆ©mitĆ© supĆ©rieure du cylindre du moteur Ć  rapport volumĆ©trique variable et l'extrĆ©mitĆ© supĆ©rieure du vĆ©rin de commande dudit moteur est rĆ©duit ;
  • La longueur moyenne des vis de fixation de la culasse de vĆ©rin de commande est augmentĆ©e et leur rĆ©sistance est la fatigue est amĆ©liorĆ©e ;
  • L'amĆ©nagement dans le carter cylindre des conduits de re-descente d'huile et de Ā« blow-by Ā» est facilitĆ©.
It is to significantly reduce the complexity of realization of the variable compression ratio engine that the cylinder head assembly and engine block according to the invention differs from the prior art in that, according to a particular embodiment:
  • The realization of the breech assembly - engine block is simplified which reduces its manufacturing cost;
  • The rigidity of the cylinder head assembly - engine block is improved;
  • The number of screws required to close the upper end of the cylinder of the variable compression ratio engine and the upper end of the control cylinder of said engine is reduced;
  • The average length of the control cylinder head cylinder mounting screws is increased and their resistance is improved fatigue;
  • The arrangement in the crankcase of the oil recirculation and blow-by ducts is facilitated.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention pour moteur Ć  rapport volumĆ©trique variable comprend une culasse commune qui coopĆØre avec un carter cylindre pour fermer d'une part l'extrĆ©mitĆ© d'au moins un cylindre du moteur au niveau de sa chambre de combustion, et d'autre part l'extrĆ©mitĆ© d'au moins un cylindre d'un vĆ©rin de commande dudit moteur au niveau de la chambre supĆ©rieure dudit vĆ©rin, ledit carter cylindre contenant l'ensemble des composants de l'attelage mobile du moteur Ć  rapport volumĆ©trique variable, et L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend des butĆ©es fixant les limites de la position haute et de la position basse de la crĆ©maillĆØre de commande qui sont constituĆ©es, du cotĆ© de ladite crĆ©maillĆØre de commande, d'une matiĆØre souple qui revĆŖt les faces supĆ©rieures et infĆ©rieures du piston de vĆ©rin de commande solidaire de ladite crĆ©maillĆØre, ladite matiĆØre souple pouvant entrer en contact soit avec la culasse commune, fixant ainsi la limite de la position haute de la crĆ©maillĆØre de commande, soit avec le carter cylindre, fixant ainsi la limite de la position basse de la crĆ©maillĆØre de commander.The cylinder head and engine block assembly according to the present invention for a variable compression ratio engine comprises a common cylinder head which cooperates with a cylinder block to close on the one hand the end of at least one cylinder of the motor at its combustion chamber, and secondly the end of at least one cylinder of a control cylinder of said motor at the upper chamber of said cylinder, said cylinder housing containing all the components of the movable hitch of the variable volumetric ratio engine, and the cylinder head and engine block assembly according to the present invention comprises stops fixing the limits of the high position and the low position of the control rack which are constituted, on the side of said control rack, a flexible material which covers the upper and lower faces of the control jack piston integral with said rack, said flexible material being able to come into contact with the common cylinder, thus fixing the limit of the upper position of the control rack, or with the cylinder block, thus fixing the limit of the low position of the rack to control.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend une culasse commune comportant un seul et mĆŖme plan de joint qui coopĆØre avec un seul et mĆŖme plan de joint que comporte le carter cylindre, lesdits plans de joint coopĆ©rant avec au moins un joint qui permet de rĆ©aliser l'Ć©tanchĆ©itĆ© entre ladite culasse commune et ledit carter cylindre.The cylinder head and engine block assembly according to the present invention comprises a common yoke having a single plane of joint which cooperates with a single plane of joint that includes the cylinder block, said joint planes cooperating with at least one joint which allows sealing between said common yoke and said cylinder block.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune comportant au moins une chambre de combustion, au moins un dispositif d'allumage et au moins deux soupapes et leur dispositif qui assure leur ouverture et leur fermeture.The cylinder head and engine block assembly according to the present invention comprises a common cylinder head having at least one combustion chamber, at least one ignition device and at least two valves and their device which ensures their opening and closing.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune qui comporte une chambre amƩnagƩe Ơ l'extrƩmitƩ de la tige supƩrieure du ou des vƩrin(s) de commande du moteur, ladite chambre Ʃtant reliƩe Ơ une arrivƩe d'huile sous pression.The cylinder head and engine block assembly according to the present invention comprises a common cylinder head which comprises a chamber arranged at the end of the upper rod of the cylinder or cylinders (s) for controlling the engine, said chamber being connected to an oil inlet under pressure.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune qui comporte une chambre amƩnagƩe Ơ l'extrƩmitƩ de la tige de contrƓle du ou des vƩrin(s) de commande du moteur, ladite chambre Ʃtant reliƩe Ơ une arrivƩe d'huile sous pression.The cylinder head and engine block assembly according to the present invention comprises a common cylinder head which comprises a chamber arranged at the end of the control rod of the engine control cylinder (s), said chamber being connected to an intake of oil under pressure.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une chambre amƩnagƩe Ơ l'extrƩmitƩ de la tige de contrƓle contenant un ressort qui exerce une poussƩe sur la tige de contrƓle en prenant appui sur le fond de ladite chambre d'une part, et sur l'extrƩmitƩ de ladite tige de contrƓle d'autre part.The cylinder head and engine block assembly according to the present invention comprises a chamber arranged at the end of the control rod containing a spring which exerts a thrust on the control rod while resting on the bottom of said chamber on the one hand, and on the end of said control rod on the other hand.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune comportant des canaux amƩnagƩs dans sa masse qui relient entre elles les chambres amƩnagƩes Ơ l'extrƩmitƩ des tiges supƩrieures des vƩrins de commande.The cylinder head assembly and engine block according to the present invention comprises a common cylinder head having channels arranged in its mass which connect together the chambers arranged at the end of the upper rods of the control cylinders.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune comportant des canaux amƩnagƩs dans sa masse qui relient entre elles les chambres amƩnagƩes Ơ l'extrƩmitƩ des tiges de contrƓle des vƩrins de commande.The cylinder head assembly and engine block according to the present invention comprises a common cylinder head having channels arranged in its mass which connect together the chambers arranged at the end of the control rods of the control cylinders.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune comportant des canaux amƩnagƩs dans sa masse qui relient la ou les chambre(s) amƩnagƩe(s) Ơ l'extrƩmitƩ de la tige supƩrieure du ou des vƩrin(s) de commande Ơ la ou aux chambre(s) amƩnagƩe(s) Ơ l'extrƩmitƩ de la tige de contrƓle du ou desdits vƩrin(s) de commande.The cylinder head and engine block assembly according to the present invention comprises a common cylinder head having channels arranged in its mass which connect the chamber (s) arranged (s) at the end of the upper rod or jack (s) control unit or at the chamber (s) arranged (s) at the end of the control rod of said cylinder (s) control (s).

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend une culasse commune qui comporte des moyens pour fixer les organes pƩriphƩriques nƩcessaires au fonctionnement du moteur et du vƩhicule d'une part, et pour fixer le moteur au vƩhicule d'autre part.The cylinder head and engine block assembly according to the present invention comprises a common yoke which comprises means for fixing the peripheral members necessary for the operation of the engine and the vehicle on the one hand, and for fixing the engine to the vehicle on the other hand.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un carter cylindre comportant un seul et mĆŖme plan de joint qui coopĆØre avec un plan de joint que comporte la culasse commune, lesdits plans de joint permettant de rĆ©aliser l'Ć©tanchĆ©itĆ© entre ladite culasse commune et ledit carter cylindre au niveau de la ou des chambre(s) de combustion du moteur d'une part, et au niveau de la chambre supĆ©rieure du ou des vĆ©rin(s) de commande d'autre part.The cylinder head and engine block assembly according to the present invention comprises a cylinder block having a single plane of joint which cooperates with a joint plane that includes the common yoke, said joint planes for sealing between said common yoke and said cylinder block at the combustion chamber (s) of the engine on the one hand, and in the upper chamber of the cylinder (s) control (s) secondly.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un carter cylindre qui comporte un arbre Ć  cames de contrĆ“le placĆ© sous le ou les vĆ©rin(s) de commande du moteur et au-dessus de la ou des crĆ©maillĆØre(s) de commande dudit moteur, la ou les tige(s) de contrĆ“le dudit moteur venant prendre appui sur ledit arbre Ć  cames.The cylinder head and engine block assembly according to the present invention comprises a cylinder block which comprises a control camshaft placed under the engine control cylinder (s) and above the control rack (s). said engine, the control rod (s) of said engine coming to bear on said camshaft.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend un arbre Ơ cames de contrƓle qui est logƩ dans des paliers dans lesquels il peut tourner.The cylinder head and engine block assembly according to the present invention comprises a control camshaft which is housed in bearings in which it can rotate.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend au moins un palier dans lequel tourne l'arbre Ơ cames de contrƓle dont le rayon est supƩrieur au plus grand rayon des cames dudit arbre Ơ cames.The cylinder head and engine block assembly according to the present invention comprises at least one bearing in which rotates the control camshaft whose radius is greater than the largest radius of the cams of said camshaft.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend des paliers dans lesquels tourne l'arbre Ć  cames de contrĆ“le qui sont de diffĆ©rents diamĆØtres afin de faciliter le montage dudit arbre Ć  cames.The cylinder head and engine block assembly according to the present invention comprises bearings in which the control camshaft rotates which are of different diameters to facilitate mounting of said camshaft.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend un arbre Ơ cames de contrƓle qui comporte un ressort de rappel en rotation.The cylinder head and engine block assembly according to the present invention comprises a control camshaft which comprises a return spring in rotation.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend un arbre Ơ cames de contrƓle qui comporte des moyens de transmission permettant de l'accoupler Ơ un moteur Ʃlectrique capable de l'entraƮner en rotation.The cylinder head and engine block assembly according to the present invention comprises a control camshaft which comprises transmission means for coupling it to an electric motor capable of driving it in rotation.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend un carter cylindre comportant au moins un culbuteur qui impose Ơ la tige de contrƓle une position verticale en fonction de la position angulaire de l'arbre Ơ cames, et Ơ l'extrƩmitƩ duquel ladite tige de contrƓle vient prendre appui, ladite tige Ʃtant maintenue en contact avec ladite extrƩmitƩ du culbuteur par le ressort logƩ dans la chambre amƩnagƩe Ơ l'extrƩmitƩ de ladite tige et/ou par la pression hydraulique rƩgnant dans ladite chambre.The cylinder head and engine block assembly according to the present invention comprises a cylinder block comprising at least one rocker arm which imposes on the control rod a vertical position as a function of the angular position of the camshaft, and at the end of which said control rod comes to bear, said rod being held in contact with said end of the rocker arm by the spring housed in the chamber arranged at the end of said rod and / or by the hydraulic pressure prevailing in said chamber.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend un culbuteur qui prend appui sur le carter cylindre d'une part, et sur l'une des cames de l'arbre Ơ cames d'autre part.The cylinder head assembly and engine block according to the present invention comprises a rocker arm which bears on the cylinder block on the one hand, and on one of the cams of the camshaft on the other hand.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un culbuteur qui prend appui sur le carter cylindre par l'intermĆ©diaire d'une liaison dont la position verticale par rapport au carter cylindre peut ĆŖtre rĆ©glĆ©e au moyen d'un dispositif de rĆ©glage.The cylinder head and engine block assembly according to the present invention comprises a rocker arm which bears on the cylinder block via a link whose vertical position relative to the cylinder block can be adjusted by means of an adjustment device.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un dispositif de rĆ©glage qui permet de rĆ©gler la position verticale de la liaison entre le culbuteur et le carter cylindre et qui est constituĆ© d'un support vissĆ© dans ledit carter cylindre qui est arrĆŖtĆ© en rotation par un moyen d'arrĆŖt.The cylinder head and engine block assembly according to the present invention comprises an adjustment device which makes it possible to adjust the vertical position of the connection between the rocker arm and the cylinder block and which consists of a support screwed into said cylinder block which is stopped in rotation by a stop means.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un carter cylindre qui comporte des butĆ©es fixant les limites de la position haute et de la position basse de la crĆ©maillĆØre de commande et qui coopĆØrent avec des butĆ©es solidaires de ladite crĆ©maillĆØre de commande.The cylinder head and engine block assembly according to the present invention comprises a cylinder block which has stops fixing the limits of the high position and the low position of the control rack and which cooperate with abutments integral with said control rack.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend une culasse commune qui comporte une butĆ©e fixant la limite de la position haute de la crĆ©maillĆØre de commande et qui coopĆØre avec une butĆ©e solidaire de ladite crĆ©maillĆØre de commande.The cylinder head assembly and engine block according to the present invention comprises a common yoke which comprises a stop fixing the limit of the upper position of the control rack and which cooperates with an abutment integral with said control rack.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un carter cylindre qui comporte au moins une fenĆŖtre rectangulaire obstruĆ©e par une plaque rectangulaire fixĆ©e sur le carter cylindre par des vis, et qui constitue le support d'un dispositif Ć  roulement du moteur.The cylinder head and engine block assembly according to the present invention comprises a cylinder block which comprises at least one rectangular window obstructed by a rectangular plate fixed to the cylinder block by screws, and which constitutes the support of a device for rolling the engine.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend un carter cylindre qui comporte des moyens pour fixer les organes pƩriphƩriques nƩcessaires au fonctionnement du moteur et du vƩhicule d'une part, et pour fixer le moteur au vƩhicule d'autre part.The cylinder head assembly and engine block according to the present invention comprises a cylinder block which comprises means for fixing the peripheral members necessary for the operation of the engine and the vehicle on the one hand, and for fixing the engine to the vehicle on the other hand.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend un seul et mĆŖme joint pour rĆ©aliser l'Ć©tanchĆ©itĆ© entre la culasse commune et le carter cylindre au niveau de la ou des chambre(s) de combustion d'une part, et au niveau de la chambre supĆ©rieure du ou des vĆ©rin(s) de commande d'autre part.The cylinder head and engine block assembly according to the present invention comprises a single seal for sealing between the common cylinder head and the cylinder block at the level of the combustion chamber (s) on the one hand, and at the the upper chamber of the cylinder (s) control (s) secondly.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend au moins un canal qui traverse le joint placƩ entre la culasse commune et le carter cylindre et qui assure le passage de l'huile de lubrification sous pression du moteur entre le carter cylindre et la culasse commune.The cylinder head and engine block assembly according to the present invention comprises at least one channel which passes through the joint placed between the common cylinder head and the cylinder block and which ensures the passage of the pressurized engine lubricating oil between the cylinder block and the cylinder. common cylinder head.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend au moins un canal qui traverse le joint placĆ© entre la culasse commune et le carter cylindre et qui permet Ć  l'huile ayant assurĆ© la lubrification des piĆØces mĆ©caniques de la culasse commune de redescendre par gravitĆ© dans le carter cylindre.The cylinder head and engine block assembly according to the present invention comprises at least one channel which passes through the joint placed between the common cylinder head and the crankcase. cylinder and which allows the oil which has lubricated the mechanical parts of the common cylinder to descend by gravity into the cylinder block.

L'ensemble culasse et bloc moteur suivant la prĆ©sente invention comprend au moins un canal qui traverse le joint placĆ© entre la culasse commune et le carter cylindre et qui permet aux gaz de Ā« blow-by Ā» prĆ©sents dans le carter cylindre de remonter vers la culasse commune.The cylinder head and engine block assembly according to the present invention comprises at least one channel which passes through the seal placed between the common cylinder head and the cylinder block and which allows the "blow-by" gases present in the cylinder block to go up to the cylinder head common.

L'ensemble culasse et bloc moteur suivant la prƩsente invention comprend au moins un canal qui traverse le joint placƩ entre la culasse commune et le carter cylindre et qui permet au fluide de refroidissement de circuler entre les chambres d'eau du carter cylindre et les chambres d'eau de la culasse commune.The cylinder head and engine block assembly according to the present invention comprises at least one channel which passes through the gasket placed between the common cylinder head and the cylinder block and which allows the cooling fluid to flow between the cylinder block water chambers and the chambers. water from the common cylinder head.

La description qui va suivre en regard des dessins annexƩs, donnƩs Ơ titre d'exemples non limitatifs, permettra de mieux comprendre l'invention, les caractƩristiques qu'elle prƩsente et les avantages qu'elle est susceptible de procurer :

  • Figure 1 est une vue en perspective Ć©clatĆ©e illustrant l'ensemble culasse et bloc moteur pour moteur Ć  rapport volumĆ©trique variable suivant la prĆ©sente invention.
  • Figure 2 est une vue en coupe montrant l'ensemble culasse et bloc moteur pour moteur Ć  rapport volumĆ©trique variable suivant la prĆ©sente invention.
  • Figure 3 est une vue en perspective reprĆ©sentant au moins un cylindre de l'ensemble culasse et bloc moteur pour moteur Ć  rapport volumĆ©trique variable suivant la prĆ©sente invention.
  • Figure 4 est une vue en perspective de cotĆ© montrant l'ensemble culasse et bloc moteur pour moteur Ć  rapport volumĆ©trique variable suivant la prĆ©sente invention.
  • Figure 5 est une vue en coupe illustrant le dispositif de contrĆ“le pour moteur Ć  rapport volumĆ©trique variable suivant la prĆ©sente invention.
  • Figure 6 est une vue schĆ©matique reprĆ©sentant le dispositif Ć©lectromĆ©canique que peut comporter l'ensemble culasse et bloc moteur suivant la prĆ©sente invention et qui permet de piloter le taux de compression d'un moteur Ć  rapport volumĆ©trique variable.
The following description with reference to the accompanying drawings, given by way of non-limiting examples, will provide a better understanding of the invention, the characteristics it has and the advantages that it is likely to provide:
  • Figure 1 is an exploded perspective view illustrating the cylinder head assembly and engine block for variable volumetric ratio engine according to the present invention.
  • Figure 2 is a sectional view showing the cylinder head assembly and engine block for variable volumetric ratio motor according to the present invention.
  • Figure 3 is a perspective view showing at least one cylinder of the cylinder head assembly and engine block for variable compression ratio engine according to the present invention.
  • Figure 4 is a side perspective view showing the cylinder head assembly and engine block for variable volumetric ratio motor according to the present invention.
  • Figure 5 is a sectional view illustrating the variable volumetric ratio motor control device according to the present invention.
  • Figure 6 is a schematic view showing the electromechanical device that can comprise the cylinder head assembly and engine block according to the present invention and which can control the compression ratio of a variable compression ratio engine.

On a montrƩ en figures 1 Ơ 4 un ensemble culasse et bloc moteur pour moteur Ơ rapport volumƩtrique variable dont la culasse 300 est commune Ơ la chambre de combustion et aux vƩrins de commande 8.We have shown in Figures 1 to 4 a cylinder head and engine block unit for a variable compression ratio engine whose cylinder head 300 is common to the combustion chamber and to the control cylinders 8.

Le moteur Ơ rapport volumƩtrique variable comprend pour chaque cylindre un dispositif de transmission 1 et un piston 2.The variable volumetric ratio engine comprises for each cylinder a transmission device 1 and a piston 2.

Le dispositif de transmission mƩcanique 1 comporte dans la partie infƩrieure du piston 2 un organe de transmission 3 solidaire dudit piston et coopƩrant, d'une part avec un dispositif de guidage Ơ roulement 4, et d'autre part avec une roue dentƩe 5.The mechanical transmission device 1 comprises in the lower part of the piston 2 a transmission member 3 secured to said piston and cooperating, on the one hand with a rolling guide device 4, and on the other hand with a toothed wheel 5.

La roue dentĆ©e 5 coopĆØre avec une bielle 6 reliĆ©e Ć  un vilebrequin 9 afin de rĆ©aliser la transmission du mouvement entre le piston 2 et ledit vilebrequin 9.The toothed wheel 5 cooperates with a connecting rod 6 connected to a crankshaft 9 in order to carry out the transmission of the movement between the piston 2 and said crankshaft 9.

La roue dentĆ©e 5 coopĆØre Ć  l'opposĆ© de l'organe de transmission 3 avec une autre crĆ©maillĆØre dite crĆ©maillĆØre de commande 7 dont la position verticale par rapport au bloc moteur est pilotĆ©e par un dispositif de contrĆ“le 12.The toothed wheel 5 cooperates opposite the transmission member 3 with another rack called control rack 7 whose vertical position relative to the engine block is controlled by a control device 12.

L'ensemble culasse et bloc moteur comprend une culasse commune 300 qui coopĆØre avec un carter cylindre 100 pour fermer d'une part l'extrĆ©mitĆ© d'au moins un cylindre 110 du moteur, et d'autre part l'extrĆ©mitĆ© d'au moins un cylindre 112 d'un vĆ©rin de commande 8 d'un dispositif de contrĆ“le 12 dudit moteur.The cylinder head and engine block assembly comprises a common cylinder head 300 which cooperates with a cylinder block 100 to close on the one hand the end of at least one cylinder 110 of the engine, and on the other hand the end of at least a cylinder 112 of a control cylinder 8 of a control device 12 of said engine.

Le carter cylindre 100 contient l'ensemble des composants de l'attelage mobile du moteur Ơ rapport volumƩtrique variable.The cylinder block 100 contains all the components of the movable hitch of the variable compression ratio engine.

L'ensemble culasse et bloc moteur comprend Ʃgalement en dessous du carter cylindre 100, un carter palier 400 et un carter d'huile 500. L'ensemble culasse et bloc moteur peut Ʃgalement comporter des arbres d'Ʃquilibrage 600 entraƮnƩs en rotation par le vilebrequin 9 par l'intermƩdiaire soit d'une courroie crantƩ, soit d'une chaƮne, soit d'une cascade de pignons.The cylinder head and engine block assembly also comprises, below the cylinder block 100, a bearing housing 400 and an oil sump 500. The cylinder head and engine block assembly may also comprise balancing shafts 600 driven in rotation by the crankshaft. 9 via either a notched belt, a chain, or a cascade of gears.

La culasse commune 300, le carter cylindre 100, le carter palier 400 et le carter d'huile 500 peuvent ĆŖtre rĆ©alisĆ©s en fonte ou en alliage lĆ©ger d'aluminium ou de magnĆ©sium.The common cylinder head 300, the cylinder block 100, the bearing housing 400 and the oil sump 500 may be made of cast iron or aluminum or magnesium light alloy.

La culasse commune 300 comporte un seul et mĆŖme plan de joint 301 qui coopĆØre avec un seul et mĆŖme plan de joint 190 que comporte le carter cylindre 100.The common yoke 300 comprises a single and same plane of joint 301 which cooperates with a single plane of joint 190 that includes the cylinder block 100.

La culasse commune 300 comporte au moins une chambre de combustion 302, au moins un dispositif d'allumage et au moins deux soupapes et leur dispositif qui assure leur ouverture et leur fermeture.The common cylinder head 300 comprises at least one combustion chamber 302, at least one ignition device and at least two valves and their device which ensures their opening and closing.

La culasse commune 300 et le carter cylindre 100 comportent respectivement des moyens, pour fixer les organes pƩriphƩriques nƩcessaires au fonctionnement du moteur et du vƩhicule d'une part, et pour fixer le moteur au vƩhicule d'autre part.The common cylinder head 300 and the cylinder block 100 respectively comprise means for fixing the peripheral members necessary for the operation of the engine and the vehicle on the one hand, and for fixing the engine to the vehicle on the other hand.

Chaque plan de joint 190, 301 coopĆØre avec au moins un joint 305 qui permet de rĆ©aliser l'Ć©tanchĆ©itĆ© entre la culasse commune 300 et le carter cylindre 100 au niveau de la ou des chambre(s) de combustion 302 du moteur d'une part, et au niveau de la chambre supĆ©rieure 121 du ou des vĆ©rin(s) de commande 8 d'autre part.Each joint plane 190, 301 cooperates with at least one seal 305 which allows sealing between the common cylinder head 300 and the cylinder block 100 at the combustion chamber (s) 302 of the engine on the one hand and at the level of the upper chamber 121 of the cylinder (s) control (s) 8 on the other hand.

L'Ć©tanchĆ©itĆ© entre la culasse commune 300 et le carter cylindre 100 est rĆ©alisĆ©e par un seul et mĆŖme joint 305 au niveau de la ou des chambre(s) de combustion 302 d'une part, et au niveau de la chambre supĆ©rieure 121 du ou des vĆ©rin(s) de commande 8 d'autre part.The seal between the common cylinder head 300 and the cylinder block 100 is formed by a single seal 305 at the combustion chamber (s) 302 on the one hand, and at the upper chamber 121 of the control cylinder (s) 8 on the other hand.

Le joint 305 peut ĆŖtre constituĆ© d'une feuille d'amiante imprĆ©gnĆ©e de graphite ou d'une feuille Ć  base de carbone pouvant ĆŖtre montĆ©e entre deux feuilles de cuivre, d'aluminium ou d'acier. Le joint 305 peut comporter des moyens de renforcement au niveau du bord des cylindres qui sont constituĆ©s d'un cerclage mĆ©tallique.The seal 305 may consist of a graphite-impregnated asbestos sheet or a carbon-based sheet mountable between two sheets of copper, aluminum or steel. The seal 305 may comprise reinforcement means at the edge of the rolls which consist of a metal strapping.

Selon un autre mode de rĆ©alisation, le joint 305 peut ĆŖtre constituĆ© d'une feuille mĆ©tallique nervurĆ©e montĆ©e avec un produit d'Ć©tanchĆ©itĆ©, et peut comprendre ou coopĆ©rer avec un ou plusieurs joints toriques.In another embodiment, the seal 305 may be made of a ribbed metal sheet mounted with a sealant, and may comprise or cooperate with one or more O-rings.

Le joint 305 commun Ơ la culasse commune 300 et au carter cylindre 100 est traversƩ par au moins un canal qui assure le passage de l'huile de lubrification sous pression du moteur entre ledit carter cylindre et ladite culasse commune.The joint 305 common to the common cylinder head 300 and the cylinder block 100 is traversed by at least one channel which ensures the passage of the pressure lubrication oil from the engine between said cylinder block and said common cylinder head.

Le joint 305 commun Ć  la culasse commune 300 et au carter cylindre 100 est traversĆ© par au moins un canal qui permet Ć  l'huile ayant assurĆ© la lubrification des piĆØces mĆ©caniques de la culasse commune 300 de redescendre par gravitĆ© dans le carter cylindre 100.The joint 305 common to the common cylinder head 300 and the cylinder block 100 is traversed by at least one channel which allows the oil which has lubricated the mechanical parts of the common cylinder 300 to descend by gravity into the cylinder block 100.

Le joint 305 commun Ć  la culasse commune 300 et au carter cylindre 100 est traversĆ© par au moins un canal qui permet aux gaz de Ā« blow-by Ā» prĆ©sents dans le carter cylindre 100 de remonter vers la culasse commune 300.The joint 305 common to the common cylinder head 300 and the cylinder block 100 is traversed by at least one channel which allows the "blow-by" gases present in the cylinder block 100 to go up to the common cylinder head 300.

Le joint 305 commun Ơ la culasse commune 300 et au carter cylindre 100 est traversƩ par au moins un canal qui permet au fluide de refroidissement du moteur de circuler entre les chambres d'eau 303 du carter cylindre 100 et les chambres d'eau 304 de la culasse commune 300.The joint 305 common to the common cylinder head 300 and to the cylinder block 100 is traversed by at least one channel which allows the cooling fluid of the engine to circulate between the water chambers 303 of the cylinder block 100 and the water chambers 304 of the common breech 300.

Le carter cylindre 100 comporte au moins une fenĆŖtre rectangulaire 192 obstruĆ©e par une plaque rectangulaire, non reprĆ©sentĆ©, fixĆ©e sur le carter cylindre 100 par des vis, et qui forme un support pour la piste de roulement et les crĆ©maillĆØres de petites dimensions du dispositif de guidage Ć  roulement 4 du moteur.The cylinder block 100 comprises at least one rectangular window 192 obstructed by a rectangular plate, not shown, fixed on the cylinder block 100 by screws, and which forms a support for the raceway and the small racks of the guide device. bearing 4 of the engine.

On a montrƩ en figure 5 le dispositif de contrƓle 12 du moteur Ơ rapport volumƩtrique variable comportant un vƩrin de commande 8 qui est constituƩ d'une tige supƩrieure de vƩrin 10, d'une tige infƩrieure de vƩrin 16, d'un piston de vƩrin 13 et d'une tige de contrƓle 20.We have shown in figure 5 the control device 12 of the variable compression ratio engine comprising a control cylinder 8 which consists of an upper cylinder rod 10, a lower cylinder rod 16, a cylinder piston 13 and a rod control 20.

Le piston de vƩrin 13 comporte une bague de rotulage pƩriphƩrique 180 qui Ʃpouse la forme sphƩrique dudit piston de vƩrin.The jack piston 13 comprises a peripheral swivel ring 180 which matches the spherical shape of said jack piston.

La tige supƩrieure de vƩrin 10 comporte dans sa partie interne et en son centre un clapet anti-retour 185 de compensation des fuites dont l'entrƩe est en communication avec une chambre 184 mƩnagƩe dans la culasse commune 300.The upper cylinder rod 10 has in its inner part and in its center a non-return valve 185 of leakage compensation whose input is in communication with a chamber 184 formed in the common yoke 300.

La sortie du clapet anti-retour 185 est reliƩe par un conduit 187 mƩnagƩ dans le piston de vƩrin 13 du vƩrin de commande 8 permettant Ơ la tige de contrƓle 20 de traversƩ ledit piston.The outlet of the non-return valve 185 is connected by a duct 187 formed in the jack piston 13 of the control jack 8 allowing the control rod 20 to pass through said piston.

Le conduit 187 communique au niveau de la tige de contrĆ“le 20, par l'intermĆ©diaire de valves 21 maintenus sur leur siĆØge par un ressort 22, soit avec une chambre supĆ©rieure 121, soit avec une chambre infĆ©rieure 122 du vĆ©rin de commande 8, se trouvant respectivement au-dessus et en dessous du piston de vĆ©rin 13.The conduit 187 communicates at the level of the control rod 20, via valves 21 held on their seat by a spring 22, either with an upper chamber 121 or with a lower chamber 122 of the control cylinder 8, respectively above and below the piston cylinder 13.

La culasse commune 300 comporte au moins une premiĆØre chambre 184 amĆ©nagĆ©e Ć  l'extrĆ©mitĆ© de la tige supĆ©rieure 10 du ou des vĆ©rin(s) de commande 8 du moteur, ladite chambre 184 Ć©tant reliĆ©e Ć  une arrivĆ©e d'huile sous pression.The common cylinder head 300 comprises at least a first chamber 184 arranged at the end of the upper rod 10 or the cylinder (s) of control 8 of the engine, said chamber 184 being connected to an oil inlet under pressure.

La culasse commune 300 comporte au moins une seconde chambre 186 amƩnagƩe Ơ l'extrƩmitƩ de la tige de contrƓle 20 du ou des vƩrin(s) de commande 8 du moteur, ladite chambre 20 Ʃtant reliƩe Ơ une arrivƩe d'huile sous pression.The common cylinder head 300 comprises at least a second chamber 186 arranged at the end of the control rod 20 or cylinder (s) control 8 of the engine, said chamber 20 being connected to a pressurized oil inlet.

La seconde chambre 186, amƩnagƩe Ơ l'extrƩmitƩ de la tige de contrƓle 20, contient un ressort, non reprƩsentƩ, qui exerce une poussƩe sur ladite tige de contrƓle en prenant appui sur le fond de ladite chambre d'une part, et sur l'extrƩmitƩ de ladite tige de contrƓle d'autre part.The second chamber 186, arranged at the end of the control rod 20, contains a spring, not shown, which exerts a thrust on said control rod by bearing on the bottom of said chamber on the one hand, and on the end of said control rod on the other hand.

La culasse commune 300 peut comporter des canaux amĆ©nagĆ©s dans sa masse qui relient entre elles les premiĆØres chambres 184 amĆ©nagĆ©es Ć  l'extrĆ©mitĆ© des tiges supĆ©rieures 10 du ou des vĆ©rin(s) de commande 8.The common yoke 300 may comprise channels arranged in its mass which connect together the first chambers 184 arranged at the end of the upper rods 10 of the control cylinder (s) 8.

Egalement, la culasse commune 300, peut comporter des canaux amƩnagƩs dans sa masse qui relient entre elles les secondes chambres 186 amƩnagƩes Ơ l'extrƩmitƩ des tiges de contrƓle 20 des vƩrins de commande 8.Also, the common yoke 300 may comprise channels arranged in its mass which connect the second chambers 186 arranged at the end of the control rods 20 of the control jacks 8.

A titre d'exemple non limitatif, la culasse commune 300 peut comporter des canaux, non reprƩsentƩs, qui relient la ou les chambre(s) 184 amƩnagƩe(s) Ơ l'extrƩmitƩ de la tige supƩrieure 10 du ou des vƩrin(s) de commande 8 Ơ la ou aux chambre(s) 186 amƩnagƩe(s) Ơ l'extrƩmitƩ de la tige de contrƓle 20 du ou desdits vƩrin(s) de commande 8.By way of non-limiting example, the common yoke 300 may comprise channels, not shown, which connect the chamber (s) 184 arranged (s) at the end of the upper rod 10 or cylinder (s) control 8 to the chamber (s) 186 arranged (s) at the end of the control rod 20 of said cylinder (s) control (s) 8.

On a reprĆ©sentĆ© en figure 6 un arbre Ć  cames de contrĆ“le 803, que comporte le carter cylindre 100, qui est placĆ© sous le ou les vĆ©rin(s) de commande 8 du moteur et au-dessus de la ou des crĆ©maillĆØre(s) de commande 7 dudit moteur sur lequel prend appui la ou les tige(s) de contrĆ“le 20 dudit moteur.We have shown in figure 6 a control camshaft 803, which includes the cylinder block 100, which is placed under the control cylinder (s) 8 of the engine and above the control rack or gears 7 of said engine on which bears the control rod (s) 20 of said engine.

Selon un mode de rƩalisation particulier l'arbre Ơ cames de contrƓle 803 peut tourner dans des paliers 191 ou dans des roulements Ơ billes ou Ơ rouleaux.According to a particular embodiment, the control camshaft 803 can rotate in bearings 191 or in ball or roller bearings.

Le carter cylindre 100 comprend au moins un palier 191 dans lequel tourne l'arbre Ơ cames de contrƓle 803 le rayon dudit palier Ʃtant supƩrieur au plus grand rayon des cames 804 dudit arbre Ơ cames.The cylinder block 100 comprises at least one bearing 191 in which the control camshaft 803 rotates, the radius of said bearing being greater than the largest radius of the cams 804 of said camshaft.

Le carter cylindre 100 comprend des paliers 191 dans lesquels tourne l'arbre Ć  cames de contrĆ“le 803 qui sont de diffĆ©rents diamĆØtres afin de faciliter le montage dudit arbre Ć  cames.The cylinder block 100 includes bearings 191 in which the control camshaft 803 rotates which are of different diameters to facilitate mounting of said camshaft.

Le carter cylindre 100 comprend un arbre Ơ cames de contrƓle 803 qui comporte un ressort de rappel en rotation, non reprƩsentƩ.The cylinder block 100 comprises a control camshaft 803 which comprises a return spring in rotation, not shown.

Le carter cylindre 100 comprend un arbre Ơ cames de contrƓle 803 qui comporte des moyens de transmission intermƩdiaire 806 permettant de l'accoupler Ơ un moteur Ʃlectrique 802 capable d'entraƮner en rotation ledit arbre Ơ cames.The cylinder block 100 comprises a control camshaft 803 which comprises intermediate transmission means 806 for coupling it to an electric motor 802 capable of rotating said camshaft.

Le carter cylindre 100 comprend au moins un culbuteur 813 qui impose Ơ la tige de contrƓle 20 une position verticale en fonction de la position angulaire de l'arbre Ơ cames 803, et Ơ l'extrƩmitƩ duquel ladite tige de contrƓle 20 vient prendre appui.The cylinder block 100 comprises at least one rocker 813 which imposes on the control rod 20 a vertical position according to the angular position of the camshaft 803, and the end of which said control rod 20 comes to bear.

La tige de contrƓle 20 est maintenue en contact avec l'extrƩmitƩ du culbuteur 813 par ressort, non reprƩsentƩ, logƩ dans la chambre 186 amƩnagƩe Ơ l'extrƩmitƩ de ladite tige et/ou par la pression hydraulique rƩgnant dans ladite chambre.The control rod 20 is kept in contact with the end of the rocker arm 813 by spring, not shown, housed in the chamber 186 arranged at the end of said rod and / or by the hydraulic pressure prevailing in said chamber.

Le carter cylindre 100 comprend un culbuteur 813 qui prend appui sur le carter cylindre 100 d'une part, et sur l'une des cames 804 de l'arbre Ơ cames de contrƓle 803 d'autre part.The cylinder block 100 comprises a rocker arm 813 which bears on the cylinder block 100 on the one hand, and on one of the cams 804 of the control camshaft 803 on the other hand.

Le culbuteur 813 prend appui sur le carter cylindre 100 par l'intermĆ©diaire d'une liaison ou d'une articulation 814 dont la position verticale par rapport au carter cylindre 100 peut ĆŖtre fixĆ©e au moyen d'un dispositif de rĆ©glage 816. La liaison 814 entre le culbuteur 813 et le carter cylindre 100 peut ĆŖtre constituĆ©e d'une rotule ou d'une liaison pivot.The rocker arm 813 is supported on the cylinder block 100 via a link or a hinge 814 whose vertical position relative to the cylinder block 100 can be fixed by means of an adjusting device 816. The link 814 between the rocker arm 813 and the cylinder block 100 may consist of a ball joint or a pivot connection.

Le carter cylindre 100 comprend un dispositif de rƩglage 816 qui permet de fixer la position verticale de la liaison 814 entre le culbuteur 813 et le carter cylindre 100.The cylinder block 100 comprises an adjusting device 816 which makes it possible to fix the vertical position of the link 814 between the rocker arm 813 and the cylinder block 100.

Le dispositif de rĆ©glage 816 est constituĆ© d'un support vissĆ© dans le carter cylindre 100 qui est arrĆŖtĆ© en rotation par un moyen d'arrĆŖt pouvant ĆŖtre, par exemple, un contre-Ć©crou, de la colle, une clavette ou un frein de type Ā« Nylstop Ā».The adjusting device 816 consists of a support screwed into the cylinder block 100 which is stopped in rotation by a stop means which may be, for example, a lock nut, glue, a key or a brake of the type "Nylstop".

Le carter cylindre 100 comporte des butĆ©es, non reprĆ©sentĆ©e, fixant les limites de la position haute et de la position basse de la crĆ©maillĆØre de commande 7. Dans ce cas, les butĆ©es du carter cylindre 100 coopĆØrent avec d'autres butĆ©es solidaires de la crĆ©maillĆØre de commande 7.The cylinder block 100 comprises abutments, not shown, fixing the limits of the high position and the low position of the control rack 7. In this case, the stops of the cylinder block 100 cooperate with other stops integral with the rack. order 7.

La culasse commune 300 comporte une butĆ©e fixant la limite de la position haute de la crĆ©maillĆØre de commande 7. En ce cas la butĆ©e de la culasse commune 300 coopĆØre avec une butĆ©e solidaire de la crĆ©maillĆØre de commande 7.The common yoke 300 comprises an abutment fixing the limit of the upper position of the control rack 7. In this case the abutment of the common yoke 300 cooperates with an abutment integral with the control rack 7.

Les butĆ©es fixant les limites de la position haute et de la position basse de la crĆ©maillĆØre de commande 7 sont constituĆ©es, du cotĆ© de ladite crĆ©maillĆØre de commande, d'une matiĆØre souple qui revĆŖt les faces supĆ©rieures et infĆ©rieures du piston de vĆ©rin 13 du vĆ©rin de commande 8 solidaire de ladite crĆ©maillĆØre.The stops fixing the limits of the high position and the low position of the control rack 7 are constituted, on the side of said control rack, with a flexible material which covers the upper and lower faces of the cylinder piston 13 of the jack 8 integral with said rack.

Les butĆ©es en matiĆØre souple peuvent entrer en contact soit avec la culasse commune 300, fixant ainsi la limite de la position haute de la crĆ©maillĆØre de commande 7, soit avec le carter cylindre 100, fixant ainsi la limite de la position basse de la crĆ©maillĆØre de commande 7.The abutments made of flexible material can come into contact either with the common yoke 300, thus fixing the limit of the upper position of the control rack 7, or with the cylinder block 100, thus fixing the limit of the lower position of the rack of order 7.

Il doit d'ailleurs ĆŖtre entendu que la description qui prĆ©cĆØde n'a Ć©tĆ© donnĆ©e qu'Ć  titre d'exemple et qu'elle ne limite nullement le domaine de l'invention dont on ne sortirait pas en remplaƧant les dĆ©tails d'exĆ©cution dĆ©crits par tout autre Ć©quivalent.It must also be understood that the foregoing description has been given by way of example only and that it in no way limits the scope of the invention which could not be overcome by replacing the execution details described. by any other equivalent.

Claims (27)

  1. Cylinder head and engine block assembly for an engine with a variable volumetric ratio comprising, in its engine block, a cylinder block (100), a transmission device (1) consisting of at least one piston (2) of a transmission member (3) cooperating, on the one hand, with a rolling guide device (4) and, on the other hand, with a toothed wheel (5), said toothed wheel (5) cooperating with the transmission member (3) with a control rack (7) whose vertical position is controlled by a control device (12) comprising a control jack (8) and a jack piston (13), characterized in that it comprises a common cylinder head (300) which cooperates with the cylinder block (100) in order, on the one hand, to close the end of at least one cylinder (110) of the engine in the region of its combustion chamber (302) and, on the other hand, to close the end of at least one cylinder (112) of a control jack (8) of said engine in the region of the upper chamber (121) of said jack, and the cylinder block (100) and the cylinder head (300) respectively comprising stops cooperating with other stops secured to the control rack (7) in order to fix the limits of the top position and the bottom position of said control rack, said stops provided on the control rack (7) side consisting of a flexible material which covers the upper and lower faces of the jack piston (13).
  2. Cylinder head and engine block assembly according to Claim 1, characterized in that the common cylinder head (300) includes one and the same joint plane (301) which cooperates with one and the same joint plane (190) belonging to the cylinder block (100), said joint planes cooperating with at least one gasket (305) which allows sealing to be provided between said common cylinder head (300) and said cylinder block (100).
  3. Cylinder head and engine block assembly according to Claim 1, characterized in that the common cylinder head (300) includes at least one combustion chamber (302), at least one ignition device and at least two valves and their device which opens them and closes them.
  4. Cylinder head and engine block assembly according to Claim 1, characterized in that the common cylinder head (300) includes a first chamber (184) formed at the end of the upper rod (10) of the control jack or jacks (8) of the engine, said chamber (184) being connected to a pressurized oil inlet.
  5. Cylinder head and engine block assembly according to Claim 1, characterized in that the common cylinder head (300) includes a second chamber (186) formed at the end of the control rod (20) of the control jack or jacks (8) of the engine, said chamber being connected to a pressurized oil inlet.
  6. Cylinder head and engine block assembly according to Claim 5, characterized in that the second chamber (186) formed at the end of the control rod (20) contains a spring which exerts a thrust on the control rod (20) while bearing on the bottom of said chamber on the one hand and on the end of said control rod on the other hand.
  7. Cylinder head and engine block assembly according to Claim 4, characterized in that the common cylinder head (300) includes passages formed within its mass which interconnect the first chambers (184) formed at the end of the upper rod (10) of each control jack (8).
  8. Cylinder head and engine block assembly according to Claim 5, characterized in that the common cylinder head (300) includes passages formed within its mass which interconnect the second chambers (186) formed at the end of the control rods (20) of each control jack (8).
  9. Cylinder head and engine block assembly according to Claims 4 and 5, characterized in that the common cylinder head (300) includes passages formed within its mass which connect the first chamber or chambers (184) formed at the end of the upper rod (10) of each control jack (8) to the second chamber or chambers (186) formed at the end of the control rods (20) of each control jack (8).
  10. Cylinder head and engine block assembly according to Claim 1, characterized in that the common cylinder head (300) includes means for fastening the peripheral members required for the operation of the engine and the vehicle on the one hand, and for fastening the engine to the vehicle on the other hand.
  11. Cylinder head and engine block assembly according to Claim 1, characterized in that the cylinder block (100) includes a control camshaft (803) placed below the control jack or jacks (8) of the engine and above one or more control racks (7) of said engine, the control rod or rods (20) of said engine coming to bear on said camshaft.
  12. Cylinder head and engine block assembly according to Claim 11, characterized in that the control camshaft (803) is housed in bearings (191) in which it can turn.
  13. Cylinder head and engine block assembly according to Claim 12, characterized in that the radius of at least one bearing (191) in which the control camshaft (803) turns is greater than the largest radius of the cams (804) of said camshaft.
  14. Cylinder head and engine block assembly according to Claim 12, characterized in that the bearings (191) in which the control camshaft (803) turns have different diameters in order to facilitate the mounting of said camshaft.
  15. Cylinder head and engine block assembly according to Claim 11, characterized in that the control camshaft (803) includes a rotational return spring (805).
  16. Cylinder head and engine block assembly according to Claim 11, characterized in that the control camshaft (803) includes intermediate transmission means (806) which enable it to be coupled to an electric motor (802) capable of rotating said camshaft.
  17. Cylinder head and engine block assembly according to Claims 1, 6 and 11, characterized in that the cylinder block (100) includes at least one rocker (813) which imposes a vertical position on the control rod (20) according to the angular position of the camshaft (803), and at the end of which rocker said control rod (20) comes to bear, said rod being kept in contact with said end of the rocker (803) by a spring housed in the chamber (186) formed at the end of said rod and/or by the hydraulic pressure existing in said chamber.
  18. Cylinder head and engine block assembly according to Claim 17, characterized in that the rocker (813) bears on the cylinder block (100) on the one hand and on one of the cams (804) of the camshaft (803) on the other hand.
  19. Cylinder head and engine block assembly according to Claim 18, characterized in that the rocker (813) bears on the cylinder block (100) by way of a connection (814) whose vertical position with respect to the cylinder block (100) can be adjusted by means of an adjusting device (816).
  20. Cylinder head and engine block assembly according to Claim 19, characterized in that the adjusting device (816), which makes it possible to adjust the vertical position of the connection between the rocker and the cylinder block (100), consists of a support bolted into said cylinder block which is locked in rotation by a locking means.
  21. Cylinder head and engine block assembly according to Claim 1, characterized in that the stops fixing the limits of the top position and the bottom position of the control rack (7) consist, on said control rack side, of a flexible material which covers the upper and lower faces of the control jack piston (13) secured to said rack, said flexible material being able to come into contact either with the common cylinder head (300), thus fixing the limit of the top position of the control rack (7), or with the cylinder block (100), thus fixing the limit of the bottom position of said rack.
  22. Cylinder head and engine block assembly according to Claim 1, characterized in that the cylinder block (100) includes at least one rectangular aperture (192) closed off by a rectangular plate which is fastened to the cylinder block by means of bolts and which constitutes the support for a rolling device (4) of the engine.
  23. Cylinder head and engine block assembly according to Claim 1, characterized in that the cylinder block (100) includes means for fastening the peripheral members required for the operation of the engine and the vehicle on the one hand, and for fastening the engine to the vehicle on the other hand.
  24. Cylinder head and engine block assembly according to Claim 2, characterized in that the gasket (305) placed between the common cylinder head (300) and the cylinder block (100) is traversed by at least one passage through which the pressurized engine lubricating oil can flow between said cylinder block and said common cylinder head.
  25. Cylinder head and engine block assembly according to Claim 2, characterized in that the gasket (305) placed between the common cylinder head (300) and the cylinder block (100) is traversed by at least one passage which allows the oil, once it has lubricated the mechanical parts of the common cylinder head (300), to return back down into the cylinder block (100) under gravity.
  26. Cylinder head and engine block assembly according to Claim 2, characterized in that the gasket (305) placed between the common cylinder head (300) and the cylinder block (100) is traversed by at least one passage which allows the blow-by gasses present in the cylinder block (100) to rise toward the common cylinder head (300).
  27. Cylinder head and engine block assembly according to Claim 2, characterized in that the gasket (305) placed between the common cylinder head (300) and the cylinder block (100) is traversed by at least one passage which allows the engine coolant to circulate between the water chambers (303) of the cylinder block (100) and the water chambers (304) of the common cylinder head (300).
EP07730868A 2006-01-26 2007-01-26 Engine block and cylinder head assembly for a variable compression ratio engine Not-in-force EP1979592B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0600707A FR2896544B1 (en) 2006-01-26 2006-01-26 CYLINDER HEAD ASSEMBLY AND MOTOR BLOCK FOR A VARIABLE VOLUMETRIC RATIO ENGINE
US76289606P 2006-01-30 2006-01-30
PCT/FR2007/000150 WO2007085740A1 (en) 2006-01-26 2007-01-26 Engine block and cylinder head assembly for a variable compression ratio engine

Publications (2)

Publication Number Publication Date
EP1979592A1 EP1979592A1 (en) 2008-10-15
EP1979592B1 true EP1979592B1 (en) 2010-07-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07730868A Not-in-force EP1979592B1 (en) 2006-01-26 2007-01-26 Engine block and cylinder head assembly for a variable compression ratio engine

Country Status (12)

Country Link
US (1) US20100154748A1 (en)
EP (1) EP1979592B1 (en)
JP (1) JP5219840B2 (en)
KR (1) KR101309486B1 (en)
CN (1) CN101375039B (en)
AT (1) ATE475797T1 (en)
AU (1) AU2007209225B2 (en)
CA (1) CA2631673C (en)
DE (1) DE602007008060D1 (en)
ES (1) ES2348753T3 (en)
FR (1) FR2896544B1 (en)
WO (1) WO2007085740A1 (en)

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FR2933140B1 (en) 2008-06-26 2011-11-11 Vianney Rabhi DEVICE FOR ADJUSTING THE COMPRESSION RATE AT THE BILLED RISE FOR A VARIABLE COMPRESSION RATE MOTOR.
FR2933141B1 (en) 2008-06-27 2011-11-11 Vianney Rabhi SCREW BALL LIFTING DEVICE FOR VARIABLE COMPRESSION RATE MOTOR.
US20100313860A1 (en) * 2009-06-15 2010-12-16 Gm Global Technology Operations, Inc. Apparatus for removal of oil from positive crankcase ventilation system
FR2969705B1 (en) 2010-12-23 2014-04-04 Vianney Rabhi TUBULAR VALVE FOR CONTROLLING AN ENGINE WITH VARIABLE VOLUMETRIC RATIO
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CN108104946B (en) * 2017-12-15 2020-04-03 äøœé£Žę±½č½¦é›†å›¢ęœ‰é™å…¬åø Lubricating system for variable compression ratio engine
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CN111878228B (en) * 2020-06-28 2021-06-11 äøœé£Žę±½č½¦é›†å›¢ęœ‰é™å…¬åø Variable compression ratio engine

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Also Published As

Publication number Publication date
WO2007085740A1 (en) 2007-08-02
JP5219840B2 (en) 2013-06-26
ATE475797T1 (en) 2010-08-15
ES2348753T3 (en) 2010-12-13
DE602007008060D1 (en) 2010-09-09
KR20080090467A (en) 2008-10-08
AU2007209225B2 (en) 2011-07-21
KR101309486B1 (en) 2013-09-24
CA2631673A1 (en) 2007-08-02
FR2896544B1 (en) 2008-05-02
EP1979592A1 (en) 2008-10-15
JP2009524768A (en) 2009-07-02
FR2896544A1 (en) 2007-07-27
CA2631673C (en) 2014-06-17
AU2007209225A1 (en) 2007-08-02
US20100154748A1 (en) 2010-06-24
CN101375039A (en) 2009-02-25
CN101375039B (en) 2012-06-13

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