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EP3094844A1 - Distribution system for a two-cylinder engine - Google Patents

Distribution system for a two-cylinder engine

Info

Publication number
EP3094844A1
EP3094844A1 EP15702533.9A EP15702533A EP3094844A1 EP 3094844 A1 EP3094844 A1 EP 3094844A1 EP 15702533 A EP15702533 A EP 15702533A EP 3094844 A1 EP3094844 A1 EP 3094844A1
Authority
EP
European Patent Office
Prior art keywords
twin
pinion
cylinder engine
distribution
crankshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15702533.9A
Other languages
German (de)
French (fr)
Other versions
EP3094844B1 (en
Inventor
Olivier Midy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RDMO SAS
Original Assignee
RDMO SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RDMO SAS filed Critical RDMO SAS
Publication of EP3094844A1 publication Critical patent/EP3094844A1/en
Application granted granted Critical
Publication of EP3094844B1 publication Critical patent/EP3094844B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/026—Gear drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
    • F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
    • F01B1/08—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders arranged oppositely relative to main shaft and of "flat" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1808—Number of cylinders two
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type

Definitions

  • the present invention relates to the field of twin-cylinder engines, in particular flat-twin-cylinder engines with a camshaft housed in the cylinder head.
  • Each engine-engine comprises the cylinder-piston-cylinder head assembly as well as the drive of the distribution.
  • Each of these shafts drives the exhaust camshaft by a conical torque.
  • Another shaft perpendicular to the intermediate axis and to the axis of the crankshaft, drives the intake cam shaft.
  • British Patent GB2392476 describes another example of a multicylinder engine comprising a distribution in the median plane of the cylinders. This solution is incompatible with a two-cylinder engine.
  • European Patent EP1717425 discloses an internal combustion engine having several rows of V cylinders, with a mechanism for driving the valves by two shafts.
  • the first idler shaft is intended to drive the camshaft of the valves of the first row, by a first belt.
  • the second crazy shaft drives the camshaft of the valves of the second row by a second belt.
  • This mixed cam drive system allows the cylinder heads to be shorter and more compact.
  • An intermediate shaft is driven by the gear crankshaft.
  • a chain connects the intermediate shaft to the double gear housed in the cylinder head which in turn drives the camshafts.
  • the chains receive guide pads with tensioner.
  • the crankshaft drives an intermediate balancing shaft on which are taken the two gears (on both sides of the shaft because to have identical high-engine parts - cylinder, cylinder-, they must be mounted upside down for the rear cylinder) of the distribution,
  • the camshafts must rotate at half the speed of the crankshaft. It comes out, with a chain drive, a camshaft sprocket at the head of a diameter double that integral with the crankshaft.
  • the diameter of the crankshaft pinion is directly related to the inside diameter of the bearings (pins).
  • the architecture includes a cascade of gables. It is quite heavy and complex to mount because it is necessary to adjust the play between pinion taking into account the crushing of all joints ...
  • the sprockets can therefore be much smaller than a traditional sprocket.
  • the camshaft gears and sprockets of the primary transmission are in two parts with a spring to eliminate play and reduce mechanical noise
  • Suzuki has installed a tensioner with a double-step locking screw (left and right on the clamping surface) that keeps the tensioner compressed for mounting.
  • the reduced stroke also reduces the height of the cylinders and increases the compactness of the block.
  • the object of the present invention is to overcome these drawbacks by proposing, in its most general sense, a two-cylinder engine comprising two separate yokes each having at least one camshaft, the engine further comprising two drive means ensuring the torque transmission between the crankshaft on the one hand and one of the cam shafts on the other hand, characterized in that it comprises a primary stage comprising two counter-rotating shafts, driven by said crankshaft and each driving the crankshaft; one of said transmission means, said two transmission means being made of identical mechanical components.
  • each of said drive means has a median longitudinal plane located, relative to the median plane of the engine, opposite the longitudinal plane passing through the crank pin of the engine comprising the cylinder head considered.
  • said primary stage comprises a pinion gear driven by a pinion integral with the crankshaft, said idler gear driving a first distribution shaft, the second distribution comprising a pinion driven by a pinion integral with said first distribution shaft.
  • each of said transmission means comprises a pinion integral with the distribution shaft, a distribution chain, at least one camshaft driven by a pinion, as well as tensioning means of said chain, said components being identical for each other. both of said dispensing means.
  • At least one of said distribution shafts further drives an oil pump.
  • At least one of said distribution shafts further causes a water pump.
  • the primary stage provides a reduction with a ratio 1 / N
  • said drive means provides a reduction with a ratio 1 / M, with N between 1.5 and 2.5 the reduction ratio overall being 1/2.
  • the axes of symmetry of said yokes are parallel.
  • FIG. 1 represents a three-quarter front view of an engine according to the invention
  • FIG. 2 represents a schematic view from above of said engine
  • FIG. 3 shows a schematic front view of said engine.
  • the engine according to the invention comprises in known manner a high-engine front (1) and high-engine rear (2).
  • the high-motors (1, 2) are aligned, to form a twin-cylinder architecture flat inclined at an angle of 25 ° relative to the horizontal axis.
  • the connecting rods (5, 6) are offset laterally, symmetrically with respect to the median longitudinal plane of the engine. They support the pistons (7, 8).
  • Each high engine (1, 2) comprises an exhaust cam shaft (9, 9 ') and an intake cam shaft (10, 10').
  • These cam shafts (9, 10; 9 ', 10') are integral with the sprockets respectively (11, 12; 11 ', 12') driven by a chain respectively (13, 13 ').
  • Each of the chains (13, 13 ') is driven upstream by a primary shaft gear (14, 14').
  • the tension and the guidance are provided by a fixed pad (15, 15 ') and a movable pad (16, 16').
  • the movable pad (16, 16 ') is pressed against the chain (13, 13') by a hydraulic tensioner, not shown.
  • admission cam shafts 10 and 10 ' are strictly identical
  • the lower engine (3) comprises a crankshaft (4) supporting a distribution sprocket (17).
  • This drive gear (17) has 26 teeth. It drives a crazy gear (18) having, in the example described 36 teeth.
  • This idler gear (18) itself drives the front shaft gear (19) having N teeth, in the example described 36 teeth.
  • This front shaft gear (19) in turn drives the rear shaft gear (20) having the same number of teeth, in the example described 36 teeth.
  • the front shaft (21) has a front driving sprocket (14) having N / 2 teeth, in the example described 18 teeth.
  • the rear shaft (21 ') comprises a rear driving chain gear (14') having N / 2 teeth, in the example described 18 teeth.
  • the chains (13, 13 ') wind up on the drive gears (14, 14') and drive the exhaust (11, 11 ') and intake (12, 12') camshaft gears. front and rear cylinder heads.
  • Figure 2 shows a view from above.
  • the engine has a longitudinal main longitudinal plane (23), vertical corresponds to the median plane of the motorcycle.
  • the piston (7) and the front rod (5) mounted on a crankpin have a longitudinal median plane (24) offset laterally with respect to the longitudinal main median plane (23) by a distance N corresponding to half the thickness of the central flywheel (25) of the crankshaft (4) and the half thickness of the crankpin.
  • the piston (8) and the connecting rod (6) rear mounted on a second crankpin have a longitudinal median plane (26) offset laterally, on the opposite side of the longitudinal median plane (24), relative to the longitudinal main median plane (23) d a distance N corresponding to half the thickness of the central flywheel (25) of the crankshaft (4) and the half thickness of the crankpin.
  • the longitudinal median plane (27) of the front timing chain (13) is located on the opposite side of the median plane (24) relative to the main median plane (23). This positioning makes it possible to reduce the lateral bulk of the engine and to accommodate the front distribution members in the space available because of the shift of the upper engine-engine with respect to the main median plane (23).
  • the longitudinal median plane (28) of the rear timing chain (13 ') is located on the opposite side of the median plane (26) relative to the main median plane (23). This positioning makes it possible to reduce the lateral bulk of the engine and to accommodate the rear distribution members in the space available because of the shift of the upper motor-rear relative to the main median plane (23).
  • the counter-rotating front (21) and rear (22) shafts are configured so that the pinions (14, 14 ') are respectively in the planes (27, 28).
  • the point of intersection between the axis of the front shaft (14) and the median plane (27) is symmetrical to the point of intersection between the axis of the rear shaft (14 ') and the median plane (28) relative to the center of symmetry of the lower engine defined by the intersection between the axis of the crankshaft (4) and the plane median principal (23).
  • the upper front engine (1) is axially symmetrical with the upper engine (2) with respect to an axis (29) included in the main median plane (23). and passing through the axis of the crankshaft (4).
  • Figure 3 shows a front view of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The invention relates to a two-cylinder engine comprising two separate cylinder heads each having at least one camshaft. The engine also comprises two drive means for transmitting torque between the crankshaft (4) and one of the camshafts (9, 10; 9', 10'), as well as comprising a primary stage and two counter-rotating shafts (21, 22) driven by the crankshaft (4) and each driving one of the transmission means, said two transmission means being formed by identical mechanical components.

Description

SYSTEME DE DISTRIBUTION POUR MOTEUR BICYLINDRE  DISTRIBUTION SYSTEM FOR TWIN ENGINE

Domaine de 1 ' invention La présente invention concerne le domaine des moteurs bicylindre, notamment des moteurs de type bicylindre à plat (« flat-twin ») à arbre à came logé dans la culasse. FIELD OF THE INVENTION The present invention relates to the field of twin-cylinder engines, in particular flat-twin-cylinder engines with a camshaft housed in the cylinder head.

Ces moteurs comportent de manière connue deux haut- moteur séparées. Chaque haut-moteur comprend l'ensemble cylindre-piston-culasse ainsi que l'entraînement de la distribution .  These engines comprise, in known manner, two separate motor units. Each engine-engine comprises the cylinder-piston-cylinder head assembly as well as the drive of the distribution.

Etat de la technique On connaît par exemple dans l'état de la technique le brevet américain US2749893 décrivant un premier exemple de moteur bicylindre de type « boxer » avec deux arbres contre- rotatifs à couples coniques. L'arbre du vilebrequin entraîne un arbre intermédiaire muni de deux pignons à taille conique. Chaque pignon entraîne un arbre par l'intermédiaire d'un couple conique. Ces arbres sont disposés perpendiculairement au vilebrequin, dans deux plans décalés. STATE OF THE ART In the state of the art, for example, US Pat. No. 2,749,893 describes a first example of a "boxer" type twin engine with two countershaft counter-rotating shafts. The crankshaft drives an intermediate shaft with two bevel gears. Each pinion drives a shaft through a conical torque. These trees are arranged perpendicular to the crankshaft, in two offset planes.

Chacun de ces arbres entraîne l'arbre à came d'échappement par un couple conique. Un autre arbre, perpendiculaire à l'axe intermédiaire et à l'axe du vilebrequin, entraine l'arbre à came d'admission.  Each of these shafts drives the exhaust camshaft by a conical torque. Another shaft, perpendicular to the intermediate axis and to the axis of the crankshaft, drives the intake cam shaft.

Le brevet anglais GB2392476 décrit un autre exemple de moteur multicylindre comprenant une distribution dans le plan médian des cylindres. Cette solution est incompatible avec un moteur bicylindre.  British Patent GB2392476 describes another example of a multicylinder engine comprising a distribution in the median plane of the cylinders. This solution is incompatible with a two-cylinder engine.

Le brevet européen EP1717425 décrit un moteur à combustion interne présentant plusieurs rangées de cylindres en V, avec un mécanisme d'entraînement des soupapes par deux arbres fous. Le premier arbre fou est destiné à entraîner l'arbre à cames des soupapes de la première rangée, par une première courroie. Le second arbre fou entraine l'arbre à cames des soupapes da la secondes rangée par une seconde courroie . Ce système mixte d'entraînement des arbres à came permet aux culasses d'être plus courtes et plus compactes. Un arbre intermédiaire est entraîné par le vilebrequin par engrenages. Une chaîne relie l'arbre intermédiaire au pignon double logé dans la culasse qui entraine à son tour les arbres à came. Les chaînes reçoivent des patins de guidage avec tendeur . European Patent EP1717425 discloses an internal combustion engine having several rows of V cylinders, with a mechanism for driving the valves by two shafts. The first idler shaft is intended to drive the camshaft of the valves of the first row, by a first belt. The second crazy shaft drives the camshaft of the valves of the second row by a second belt. This mixed cam drive system allows the cylinder heads to be shorter and more compact. An intermediate shaft is driven by the gear crankshaft. A chain connects the intermediate shaft to the double gear housed in the cylinder head which in turn drives the camshafts. The chains receive guide pads with tensioner.

Le vilebrequin entraîne un arbre intermédiaire d'équilibrage sur lequel se prennent les deux pignons (de part et d'autre de l'arbre car pour avoir des pièces haut-moteur identiques -culasse, cylindre-, il faut les monter à l'envers pour le cylindre arrière) de la distribution, Comme sur tout moteur à cycle 4 temps, les arbre à cames doivent tourner à la moitié de la vitesse du vilebrequin. Il en ressort, avec une commande par chaîne, un pignon d'arbre à came en tête d'un diamètre double de celui solidaire du vilebrequin. Le diamètre du pignon du vilebrequin étant directement lié au diamètre intérieur des paliers (tourillons).  The crankshaft drives an intermediate balancing shaft on which are taken the two gears (on both sides of the shaft because to have identical high-engine parts - cylinder, cylinder-, they must be mounted upside down for the rear cylinder) of the distribution, As on any 4-stroke cycle engine, the camshafts must rotate at half the speed of the crankshaft. It comes out, with a chain drive, a camshaft sprocket at the head of a diameter double that integral with the crankshaft. The diameter of the crankshaft pinion is directly related to the inside diameter of the bearings (pins).

L'architecture comprend une cascade de pignons. C'est assez lourd et complexe à monter car il faut régler le jeu entre pignon en tenant compte de l'écrasement de tous les joints... Reste une solution mixte que les ingénieurs de Suzuki ont retenu avec une chaîne entraînée depuis un arbre intermédiaire (qui entraîne directement le rotor de pompe à eau, fixé en bout) et qui tourne à demi-vitesse du vilebrequin jusqu'à un pignon fou (à hauteur du plan de joint de culasse) avec ensuite un pignon qui répartit le mouvement, inversé, sur les deux pignons des arbres à cames qui intègrent un rattrapage de jeu et un ressort d'amortissement des chocs. Les pignons peuvent donc être beaucoup plus petits qu'une roue dentée traditionnelle. Les engrenages d'arbre à came et les pignons de la transmission primaire sont en deux parties avec un ressort pour éliminer le jeu et réduire le bruit mécanique The architecture includes a cascade of gables. It is quite heavy and complex to mount because it is necessary to adjust the play between pinion taking into account the crushing of all joints ... Remains a mixed solution that Suzuki engineers have retained with a chain driven from an intermediate shaft (which directly drives the water pump rotor, fixed at the end) and which rotates at half speed from the crankshaft to an idle gear (at the level of the head gasket plane) with then a pinion which distributes the movement, inverted , on both camshaft sprockets which incorporate a play catch and shock damping spring. The sprockets can therefore be much smaller than a traditional sprocket. The camshaft gears and sprockets of the primary transmission are in two parts with a spring to eliminate play and reduce mechanical noise

De plus le système de tension de chaîne pose moins de problème, les chaînes étant moins longues. Suzuki a installé un tendeur avec une vis de blocage à double pas (à gauche en bout et à droite sur la portée de serrage) qui permet de maintenir le tendeur comprimé pour son montage. La course réduite permet aussi de diminuer la hauteur des cylindres et accentue la compacité du bloc.  In addition the chain tension system is less of a problem, the chains being shorter. Suzuki has installed a tensioner with a double-step locking screw (left and right on the clamping surface) that keeps the tensioner compressed for mounting. The reduced stroke also reduces the height of the cylinders and increases the compactness of the block.

Inconvénients de l'art antérieur Disadvantages of prior art

Les solutions connues dans l'art antérieur mettent en œuvre un nombre important de composants mécaniques, différents pour chacun des haut-moteurs. Ceci augmente le coût de fabrication et de maintenance du moteur. The known solutions in the prior art implement a large number of mechanical components, different for each of the high-motors. This increases the cost of manufacturing and maintenance of the engine.

Solution apportée par l'invention Solution provided by the invention

L'objet de la présente invention est de remédier à ces inconvénients en proposant, selon son acception la plus générale, un moteur bicylindre comprenant deux culasses séparées présentant chacune au moins un arbre à came, le moteur comprenant en outre deux moyens d'entraînement assurant la transmission du couple entre le vilebrequin d'une part et l'un des arbres à came d'autre part, caractérisé en ce qu'il comprend un étage primaire comprenant deux arbres contre- rotatifs, entraînés par ledit vilebrequin et entraînant chacun l'un desdits moyens de transmission, lesdits deux moyens de transmission étant constitués de composants mécaniques identiques . The object of the present invention is to overcome these drawbacks by proposing, in its most general sense, a two-cylinder engine comprising two separate yokes each having at least one camshaft, the engine further comprising two drive means ensuring the torque transmission between the crankshaft on the one hand and one of the cam shafts on the other hand, characterized in that it comprises a primary stage comprising two counter-rotating shafts, driven by said crankshaft and each driving the crankshaft; one of said transmission means, said two transmission means being made of identical mechanical components.

La solution apportée par l'interposition d'un étage primaire comprenant deux arbres contre-rotatifs permet de symétriser totalement les deux haut-moteurs, et d'utiliser des composants de transmission identiques pour l'un et l'autre des haut-moteurs. Dans l'art antérieur, il est nécessaire de concevoir pour chacun des haut-moteurs des composants mécaniques spécifiques. The solution provided by the interposition of a primary stage comprising two counter-rotating shafts completely symmetrize the two high-motors, and use identical transmission components for both high-motors. In the prior art, it is necessary to design for each of the built-in motors specific mechanical components.

Avantageusement, chacun desdits moyens d'entraînement présente un plan longitudinal médian situé, par rapport au plan médian du moteur, à l'opposé du plan longitudinal passant par le maneton du haut-moteur comprenant la culasse considérée.  Advantageously, each of said drive means has a median longitudinal plane located, relative to the median plane of the engine, opposite the longitudinal plane passing through the crank pin of the engine comprising the cylinder head considered.

De préférence, ledit étage primaire comprend un pignon fou entraîné par un pignon solidaire du vilebrequin, ledit pignon fou entraînant un premier arbre de distribution, le second de distribution comprenant un pignon entraîné par un pignon solidaire dudit premier arbre de distribution.  Preferably, said primary stage comprises a pinion gear driven by a pinion integral with the crankshaft, said idler gear driving a first distribution shaft, the second distribution comprising a pinion driven by a pinion integral with said first distribution shaft.

Avantageusement, chacun desdits moyens de transmission comprend un pignon solidaire de l'arbre de distribution, une chaîne de distribution, au moins un arbre à came entraînés par un pignon, ainsi que des moyens de tension de ladite chaîne, lesdits composants étant identiques pour l'un et l'autre desdits moyens de distribution.  Advantageously, each of said transmission means comprises a pinion integral with the distribution shaft, a distribution chain, at least one camshaft driven by a pinion, as well as tensioning means of said chain, said components being identical for each other. both of said dispensing means.

Selon un premier mode de réalisation, l'un au moins desdits arbres de distribution entraîne en outre une pompe à huile .  According to a first embodiment, at least one of said distribution shafts further drives an oil pump.

Selon une deuxième mode de réalisation, l'un au moins desdits arbres de distribution entraîne en outre une pompe à eau .  According to a second embodiment, at least one of said distribution shafts further causes a water pump.

Avantageusement, l'étage primaire assure un réduction avec un rapport 1/N, et en ce que lesdits moyens d'entraînement assure une réduction avec un rapport 1/M, avec N compris entre 1,5 et 2,5 le rapport de réduction global étant de 1/2.  Advantageously, the primary stage provides a reduction with a ratio 1 / N, and in that said drive means provides a reduction with a ratio 1 / M, with N between 1.5 and 2.5 the reduction ratio overall being 1/2.

Selon une variante de réalisation avantageuse, les axes de symétrie desdites culasses sont parallèles. Description détaillée d'un exemple non limitatif de According to an advantageous embodiment, the axes of symmetry of said yokes are parallel. Detailed description of a non-limiting example of

réalisation  production

L'invention sera mieux comprise à la lecture de la description d'un exemple de réalisation non limitatif se référant aux dessins annexés où : The invention will be better understood on reading the description of a nonlimiting exemplary embodiment with reference to the appended drawings in which:

- la figure 1 représente une vue de trois-quarts avant d'un moteur selon l'invention  FIG. 1 represents a three-quarter front view of an engine according to the invention

- la figure 2 représente une vue schématique de dessus dudit moteur  FIG. 2 represents a schematic view from above of said engine

- la figure 3 représente une vue schématique de face dudit moteur.  - Figure 3 shows a schematic front view of said engine.

Le moteur selon l'invention comprend de façon connu un haut-moteur avant ( 1 ) et haut-moteur arrière ( 2 ) . Dans l'exemple décrit, les haut-moteurs (1, 2) sont alignés, pour former une architecture de type bicylindre à plat incliné d'un angle de 25° par rapport à l'axe horizontal.  The engine according to the invention comprises in known manner a high-engine front (1) and high-engine rear (2). In the example described, the high-motors (1, 2) are aligned, to form a twin-cylinder architecture flat inclined at an angle of 25 ° relative to the horizontal axis.

Entre les deux haut-moteurs (1, 2) est logé le bas- moteur (3) comprenant le vilebrequin (4). Les bielles (5, 6) sont décalées latéralement, symétriquement par rapport au plan longitudinal médian du moteur. Elles supportent les pistons (7, 8).  Between the two high-motors (1, 2) is housed the lower motor (3) comprising the crankshaft (4). The connecting rods (5, 6) are offset laterally, symmetrically with respect to the median longitudinal plane of the engine. They support the pistons (7, 8).

Chaque haut-moteur ( 1 , 2 ) comprend un arbre à came d'échappement (9, 9') et un arbre à came d'admission (10, 10'). Ces arbres à came (9, 10 ; 9', 10') sont solidaires des pignons respectivement (11, 12 ; 11', 12') entraînés par une chaîne respectivement (13, 13').  Each high engine (1, 2) comprises an exhaust cam shaft (9, 9 ') and an intake cam shaft (10, 10'). These cam shafts (9, 10; 9 ', 10') are integral with the sprockets respectively (11, 12; 11 ', 12') driven by a chain respectively (13, 13 ').

Chacune des chaînes (13, 13') est entraînée en amont par un pignon d'arbre primaire (14, 14'). La tension et le guidage sont assurés par un patin fixe (15, 15') et par un patin mobile (16, 16').  Each of the chains (13, 13 ') is driven upstream by a primary shaft gear (14, 14'). The tension and the guidance are provided by a fixed pad (15, 15 ') and a movable pad (16, 16').

Le patin mobile (16, 16') est pressé contre la chaîne (13, 13') par un tendeur hydraulique non représenté.  The movable pad (16, 16 ') is pressed against the chain (13, 13') by a hydraulic tensioner, not shown.

Les paires de composants mécaniques des deux haut- moteurs (1, 2) sont identiques : - les arbres à came d'échappement 9 et 9' sont strictement identiques The pairs of mechanical components of the two high motors (1, 2) are identical: - the exhaust camshafts 9 and 9 'are strictly identical

- les arbres à came d'admission 10 et 10' sont strictement identiques  the admission cam shafts 10 and 10 'are strictly identical

- les pignons 11 et 11' ainsi que les pignons 12 et the pinions 11 and 11 'as well as the pinions 12 and

12 ' sont strictement identiques 12 'are strictly identical

- les chaînes 13 et 13' sont strictement identiques chains 13 and 13 'are strictly identical

- les patins fixes (15, 15') ainsi que les patins mobile (16, 16) sont strictement identiques. - The fixed pads (15, 15 ') and the movable pads (16, 16) are strictly identical.

Le bas-moteur (3) comprend un vilebrequin (4) supportant un pignon menant de distribution (17). Ce pignon menant (17) présente 26 dents. Il entraîne un pignon fou (18) présentant, dans l'exemple décrit 36 dents.  The lower engine (3) comprises a crankshaft (4) supporting a distribution sprocket (17). This drive gear (17) has 26 teeth. It drives a crazy gear (18) having, in the example described 36 teeth.

Ce pignon fou (18) entraîne lui-même le pignon d'arbre avant (19) présentant N dents, dans l'exemple décrit 36 dents.  This idler gear (18) itself drives the front shaft gear (19) having N teeth, in the example described 36 teeth.

Ce pignon d'arbre avant (19) entraîne à son tour le pignon d'arbre arrière (20) présentant le même nombre de dents, dans l'exemple décrit 36 dents.  This front shaft gear (19) in turn drives the rear shaft gear (20) having the same number of teeth, in the example described 36 teeth.

L'arbre avant (21) comporte un pignon de chaîne menant avant (14) présentant N/2 dents, dans l'exemple décrit 18 dents.  The front shaft (21) has a front driving sprocket (14) having N / 2 teeth, in the example described 18 teeth.

De même, pour le bas-moteur arrière, l'arbre arrière (21') comporte un pignon de chaîne menant arrière (14') présentant N/2 dents, dans l'exemple décrit 18 dents.  Similarly, for the lower rear engine, the rear shaft (21 ') comprises a rear driving chain gear (14') having N / 2 teeth, in the example described 18 teeth.

Les chaînes (13, 13') s'enroulent sur les pignons menant (14, 14') et entraînent les pignons d'arbre à came d'échappement (11, 11') et d'admission (12, 12') des culasses avant et arrière.  The chains (13, 13 ') wind up on the drive gears (14, 14') and drive the exhaust (11, 11 ') and intake (12, 12') camshaft gears. front and rear cylinder heads.

II est noté que dans la description propose une distribution par chaîne, mais que ce terme englobe toutes les alternatives connues, telles qu'une courroie de transmission. La figure 2 représente une vue de dessus. Le moteur présente un plan médian longitudinal (23) principal, vertical correspond au plan médian de la motocyclette. It is noted that in the description proposes a chain distribution, but that this term encompasses all known alternatives, such as a transmission belt. Figure 2 shows a view from above. The engine has a longitudinal main longitudinal plane (23), vertical corresponds to the median plane of the motorcycle.

Le piston (7) et la bielle avant (5) montée sur un maneton présentent un plan médian longitudinal (24) décalé latéralement par rapport au plan médian longitudinal (23) principal d'un distance N correspondant à la moitié de l'épaisseur du volant central (25) du vilebrequin (4) et de la demie épaisseur du maneton.  The piston (7) and the front rod (5) mounted on a crankpin have a longitudinal median plane (24) offset laterally with respect to the longitudinal main median plane (23) by a distance N corresponding to half the thickness of the central flywheel (25) of the crankshaft (4) and the half thickness of the crankpin.

Le piston (8) et la bielle (6) arrière montée sur un second maneton présentent un plan médian longitudinal (26) décalé latéralement, du coté opposé du plan médian longitudinal (24), par rapport au plan médian longitudinal (23) principal d'une distance N correspondant à la moitié de l'épaisseur du volant central (25) du vilebrequin (4) et de la demie épaisseur du maneton.  The piston (8) and the connecting rod (6) rear mounted on a second crankpin have a longitudinal median plane (26) offset laterally, on the opposite side of the longitudinal median plane (24), relative to the longitudinal main median plane (23) d a distance N corresponding to half the thickness of the central flywheel (25) of the crankshaft (4) and the half thickness of the crankpin.

Le plan médian longitudinal (27) de la chaîne de distribution avant (13) est situé du coté opposé du plan médian (24), relativement au plan médian principal (23). Ce positionnement permet de réduire l'encombrement latéral du moteur et de loger les organes de distribution avant dans l'espace disponible du fait du décalage du haut-moteur avant par rapport au plan médian principal (23).  The longitudinal median plane (27) of the front timing chain (13) is located on the opposite side of the median plane (24) relative to the main median plane (23). This positioning makes it possible to reduce the lateral bulk of the engine and to accommodate the front distribution members in the space available because of the shift of the upper engine-engine with respect to the main median plane (23).

Le plan médian longitudinal (28) de la chaîne de distribution arrière (13') est situé du coté opposé du plan médian (26), relativement au plan médian principal (23). Ce positionnement permet de réduire l'encombrement latéral du moteur et de loger les organes de distribution arrière dans l'espace disponible du fait du décalage du haut-moteur arrière par rapport au plan médian principal (23).  The longitudinal median plane (28) of the rear timing chain (13 ') is located on the opposite side of the median plane (26) relative to the main median plane (23). This positioning makes it possible to reduce the lateral bulk of the engine and to accommodate the rear distribution members in the space available because of the shift of the upper motor-rear relative to the main median plane (23).

Les arbres contre-rotatifs avant (21) et arrière (22) sont configurés pour que les pignons (14, 14') soient respectivement dans les plans (27, 28).  The counter-rotating front (21) and rear (22) shafts are configured so that the pinions (14, 14 ') are respectively in the planes (27, 28).

Le point d'intersection entre l'axe de l'arbre avant (14) et du plan médian (27) est symétrique au point d'intersection entre l'axe de l'arbre arrière (14') et du plan médian (28) par rapport au centre de symétrie du bas-moteur défini par l'intersection entre l'axe du vilebrequin (4) et le plan médian principal (23). The point of intersection between the axis of the front shaft (14) and the median plane (27) is symmetrical to the point of intersection between the axis of the rear shaft (14 ') and the median plane (28) relative to the center of symmetry of the lower engine defined by the intersection between the axis of the crankshaft (4) and the plane median principal (23).

De même, dans l'exemple d'un moteur bicylindre à plat, le haut-moteur avant (1) est symétrique axialement au haut-moteur (2) par rapport à un axe (29) compris dans le plan médian principal (23) et passant par l'axe du vilebrequin (4).  Similarly, in the example of a flat two-cylinder engine, the upper front engine (1) is axially symmetrical with the upper engine (2) with respect to an axis (29) included in the main median plane (23). and passing through the axis of the crankshaft (4).

La figure 3 représente une vue de face du moteur.  Figure 3 shows a front view of the engine.

Claims

Revendications claims 1 — Moteur bicylindre comprenant deux culasses séparées présentant chacune au moins un arbre à came, le moteur comprenant en outre deux moyens d'entraînement assurant la transmission du couple entre le vilebrequin (4) d'une part et l'un des arbres à came (9, 10 ; 9', 10') d'autre part, caractérisé en ce qu'il comprend un étage primaire comprenant deux arbres avant (21) et arrière (22) contre-rotatifs configurés pour que les pignons (14, 14') soient respectivement dans des plans médians (27, 28), entraînés par ledit vilebrequin (4) et entraînant chacun l'un desdits moyens de transmission, lesdits deux moyens de transmission étant constitués de composants mécaniques identiques. 1 - Twin cylinder engine comprising two separate yokes each having at least one camshaft, the engine further comprising two drive means ensuring the transmission of torque between the crankshaft (4) on the one hand and one of the camshafts (9, 10; 9 ', 10') on the other hand, characterized in that it comprises a primary stage comprising two counter-rotating front (21) and rear (22) shafts configured so that the pinions (14, 14 ') are respectively in median planes (27, 28) driven by said crankshaft (4) and each driving one of said transmission means, said two transmission means being made of identical mechanical components. 2 — Moteur bicylindre selon la revendication 1 caractérisé en ce que chacun desdits moyens d'entraînement présente un plan longitudinal médian (27, 28) situé, par rapport au plan médian du moteur (23), à l'opposé du plan longitudinal (24, 26) passant par le maneton du haut-moteur comprenant la culasse considérée.  2 - twin-cylinder engine according to claim 1 characterized in that each of said drive means has a median longitudinal plane (27, 28) located, relative to the median plane of the motor (23), opposite the longitudinal plane (24). , 26) passing through the crank pin of the built-in engine including the breech considered. 3 - Moteur bicylindre selon la revendication 1 ou 2 caractérisé en ce que ledit étage primaire comprend un pignon fou (18) entraîné par un pignon solidaire (17) du vilebrequin (4), ledit pignon fou (18) entraînant par l'intermédiaire d'un pignon (19) un premier arbre de distribution (21), le second arbre de distribution (22) comprenant un pignon (20) entraîné par ledit pignon solidaire (19) dudit premier arbre de distribution (21).  3 - twin-cylinder engine according to claim 1 or 2 characterized in that said primary stage comprises a pinion gear (18) driven by a pinion (17) of the crankshaft (4), said idler gear (18) driving via a pinion (19) a first distribution shaft (21), the second distribution shaft (22) comprising a pinion (20) driven by said integral pinion (19) of said first distribution shaft (21). 4 - Moteur bicylindre selon l'une au moins des revendications précédentes caractérisé en ce que chacun desdits moyens de transmission comprend un pignon solidaire de l'arbre de distribution (21, 22), une chaîne de distribution (13, 13'), au moins un arbre à came (9, 9' ; 10, 10') entraînés par un pignon (11, 11' ; 12, 12'), ainsi que des moyens de tension de ladite chaîne, lesdits composants étant identiques pour l'un et l'autre desdits moyens de distribution . 4 - twin-cylinder engine according to at least one of the preceding claims characterized in that each of said transmission means comprises a pinion integral with the distribution shaft (21, 22), a distribution chain (13, 13 '), at at least one camshaft (9, 9 '; 10, 10') driven by a pinion (11, 11 '; 12, 12'), and means for tensioning said chain, said components being identical for one and the other of said distribution means. 5 - Moteur bicylindre selon l'une au moins des revendications précédentes caractérisé en ce que l'un au moins desdits arbres de distribution (21, 21') entraîne en outre une pompe à huile.  5 - Twin-cylinder engine according to at least one of the preceding claims characterized in that at least one of said distribution shafts (21, 21 ') further drives an oil pump. 6 - Moteur bicylindre selon l'une au moins des revendications précédentes caractérisé en ce que l'un au moins desdits arbres de distribution (22, 22') entraîne en outre une pompe à eau.  6 - Twin-cylinder engine according to at least one of the preceding claims characterized in that at least one of said distribution shafts (22, 22 ') further drives a water pump. 7 — Moteur bicylindre selon l'une au moins des revendications précédentes caractérisé en ce que l'étage primaire assure un réduction avec un rapport 1/N, et en ce que lesdits moyens d'entraînement assure une réduction avec un rapport 1/M, avec N compris entre 1,5 et 2,5 le rapport de réduction global étant de 1/2.  7 - twin-cylinder engine according to at least one of the preceding claims characterized in that the primary stage provides a reduction with a ratio 1 / N, and in that said drive means provides a reduction with a 1 / M ratio, with N between 1.5 and 2.5 the overall reduction ratio being 1/2. 8 — Moteur bicylindre selon l'une au moins des revendications précédentes caractérisé en ce que les axes de symétrie desdites culasses sont parallèles.  8 - twin-cylinder engine according to at least one of the preceding claims characterized in that the axes of symmetry of said cylinder heads are parallel.
EP15702533.9A 2014-01-13 2015-01-08 Distribution system for a two-cylinder engine Active EP3094844B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1450234A FR3016402B1 (en) 2014-01-13 2014-01-13 DISTRIBUTION SYSTEM FOR BICYLINDRIC ENGINE
PCT/FR2015/050027 WO2015104496A1 (en) 2014-01-13 2015-01-08 Distribution system for a two-cylinder engine

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EP3094844A1 true EP3094844A1 (en) 2016-11-23
EP3094844B1 EP3094844B1 (en) 2019-10-30

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JP (1) JP2017503968A (en)
CN (1) CN106030074A (en)
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DE102018207512A1 (en) * 2018-05-15 2019-11-21 Bayerische Motoren Werke Aktiengesellschaft driving device
JP6656614B2 (en) * 2019-03-19 2020-03-04 株式会社石川エナジーリサーチ Opposed piston engine

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EP3094844B1 (en) 2019-10-30
CN106030074A (en) 2016-10-12
WO2015104496A1 (en) 2015-07-16
JP2017503968A (en) 2017-02-02
FR3016402B1 (en) 2018-01-19
FR3016402A1 (en) 2015-07-17

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