FR2629865A1 - Compact modular multi-cylinder two-stroke engine - Google Patents

Compact modular multi-cylinder two-stroke engine Download PDF

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Publication number
FR2629865A1
FR2629865A1 FR8804977A FR8804977A FR2629865A1 FR 2629865 A1 FR2629865 A1 FR 2629865A1 FR 8804977 A FR8804977 A FR 8804977A FR 8804977 A FR8804977 A FR 8804977A FR 2629865 A1 FR2629865 A1 FR 2629865A1
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France
Prior art keywords
cylinders
drive units
engine according
basic drive
basic
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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.)
Withdrawn
Application number
FR8804977A
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French (fr)
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MENEY REGIS
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MENEY REGIS
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 MENEY REGIS filed Critical MENEY REGIS
Priority to FR8804977A priority Critical patent/FR2629865A1/en
Publication of FR2629865A1 publication Critical patent/FR2629865A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • 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
    • F01B1/12—Separate cylinder-crankcase elements coupled together to form a unit
    • 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
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • 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
    • F02B73/00—Combinations of two or more engines, not otherwise provided for
    • 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
    • F02B75/20—Multi-cylinder engines with cylinders all in one line
    • 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
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • F02B75/228—Multi-cylinder engines with cylinders in V, fan, or star arrangement with cylinders arranged in parallel banks
    • 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
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle 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
    • 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
    • F02B2075/1804—Number of cylinders
    • F02B2075/1816—Number of cylinders four

Abstract

The invention relates to an arrangement making it possible to design a two-stroke internal combustion engine with several cylinders, whilst keeping it small. The cylinders 2 are grouped together in modules of two. Their connecting rods actuate a drive shaft 5 by virtue of two overhanging crank pins 3 located at its ends. The precompression chamber 10, since it contains only one crankshaft web, is of small width. Furthermore, its outside face 9 is free, allowing the direct intake of fresh gases through the pipe 1. Each pair of cylinders is secured to the others and to the transmission members such as the clutch 8 by the gear 4 which drives the intermediate shaft (layshaft) 6. The device according to the invention is particularly suitable for the production of modular ranges of engines, and for the design of compact multi-cylinder motorized propulsion units for all-terrain (scrambling) motorcycles.

Description

La présente invention concerne les moteurs polycylindres à deux temps qui doivent impérativement rester compacts, tels les moteurs de motocyclettes de tout-terrain. The present invention relates to two-stroke polycylinder engines which must imperatively remain compact, such as engines for all-terrain motorcycles.

Les motocyclettes légeres de tout-terrain se voient pratiquement interdire l'emploi de moteurs a plusieurs cylindres du fait des contraintes de masse et de volume réduits, surtout au niveau du bas-moteur, qui doit être très étroit (risques de chocs contre des rochers ou en cas de chute). Light all-terrain motorcycles are practically prohibited from using multi-cylinder engines due to the reduced mass and volume constraints, especially at the bottom of the engine, which must be very narrow (risk of impact against rocks or in the event of a fall).

Les moteurs selon le cycle a deux temps sont particulierement penalisés, puisqu'ils obligent chaque cylindre a avoir sa chambre de précompression et son maneton de vilebrequin en propre (contrairement au moteur a quatre temps). L'admission des gaz frais, qui se fait dans les parties basses du moteur, peut enfin poser des difficultés insurmontables d'accessibilité ou de largeur sur un tel moteur à plusieurs cylindres. Engines according to the two-stroke cycle are particularly penalized, since they oblige each cylinder to have its own precompression chamber and its crankshaft crankpin (unlike the four-stroke engine). The admission of fresh gas, which is done in the lower parts of the engine, can finally pose insurmountable difficulties of accessibility or width on such an engine with several cylinders.

Pour ces raisons, les motocyclettes de tout-terrain actuelles ne peuvent profiter des avantages du polycylindre: équilibrage favorable, facilité de démarrage, centre de gravité plus bas, fiabilité. For these reasons, current all-terrain motorcycles cannot take advantage of the advantages of the polycylinder: favorable balancing, ease of starting, lower center of gravity, reliability.

Le dispositif selon l'invention permet de remédier à ces impossibilités. I1 utilise à cette fin un type d'embiellage particulièrement étroit constitué comme suit: un très court arbre porte à chacune de ses extrémités un vilebrequin en porte-à- faux. La prise de force s'effectue par un pignon placé au milieu de cet arbre, entre ses paliers.Cet embiellage ne comptant qu'une joue de vilebrequin par cylindre, il en résulte des chambres de précompression (carter-pompe) étroites, dont la face externe (sans palier) est libre de recevoir la tubulure d'admission et son système de contrôle des gaz frais. I1 découle de la conception de cet embiellage un regroupement des cylindres deux à deux pour former un module de base du moteur, module pouvant être utilisé en nombre variable et selon une disposition géométrique adaptée aux besoins: quatre cylindres en V, en carré, à plat, six cylindres en W, -etc... Les modules de base sont synchronisés et solidarisés entre eux en étant en prise avec un arbre intermédiaire par le biais de leurs pignons centraux de vilebrequins.Même si lton multiplie les modules de base pour augmenter la capacité totale du moteur, la largeur du bloc reste déterminée par les valeurs d'un bicylindre de faible cylindrée. On peut aussi n'utiliser qu'un seul module de base. On obtient alors un moteur bicylindre. The device according to the invention overcomes these impossibilities. For this purpose, it uses a particularly narrow type of linkage made up as follows: a very short shaft carries at each of its ends a cantilever crankshaft. The power take-off is carried out by a pinion placed in the middle of this shaft, between its bearings. This crankshaft only having one crankshaft per cylinder, this results in narrow precompression chambers (pump housing), the external face (without bearing) is free to receive the intake manifold and its fresh gas control system. I1 follows from the design of this linkage a grouping of the cylinders two by two to form a basic module of the engine, module which can be used in variable number and according to a geometrical arrangement adapted to the needs: four cylinders in V, square, flat , six cylinders in W, -etc ... The basic modules are synchronized and secured together by being engaged with an intermediate shaft through their central crankshaft gears. Even if lton multiplies the basic modules to increase the total capacity of the engine, the block width remains determined by the values of a twin cylinder of small displacement. You can also use only one basic module. A two-cylinder engine is then obtained.

Selon une forme de réalisation préférentielle, deux unités motrices de base sont disposées "en carré", c'est-à-dire que deux rangées de cylindres sont parallèles et côte-à-côte pour donner un moteur à quatre cylindres. Les deux petits arbresmoteurs engrènent l'un sur l'autre par leurs pignons centraux de vilebrequin, tandis que l'un de ces derniers engrène sur un arbre intermédiaire qui achemine la puissance aux organes de transmission. L'admission des gaz frais se fait gracie à des valves automatiques à clapets. According to a preferred embodiment, two basic drive units are arranged "square", that is to say that two rows of cylinders are parallel and side by side to give a four-cylinder engine. The two small motor shafts mesh with one another by their central crankshaft gears, while one of the latter meshes with an intermediate shaft which feeds power to the transmission members. The admission of fresh gases is done through automatic flap valves.

Selon une variante, les embiellages en porte-à-faux et l'arbre intermédiaire sont solidarisés par une chaîne et des pignons. According to a variant, the overhanging linkages and the intermediate shaft are secured by a chain and sprockets.

Selon une autre variante, l'admission des gaz frais se fait à l'aide d'un disque distributeur rotatif, ce dernier, porté par le maneton en porte- -faux et pourvu de découpes adéquates, vient fermer ou démasquer le débouché de la pipe d'admission dans le carter-pompe, selon un diagramme convenable. According to another variant, the admission of fresh gases is done using a rotary distributor disc, the latter, carried by the crank pin in overhang and provided with suitable cutouts, comes to close or unmask the outlet of the intake pipe in the pump housing, according to a suitable diagram.

La figure 1 représente, en coupe, un schéma de principe d' une unité (module) motrice de base selon l'invention. Figure 1 shows, in section, a block diagram of a basic motor unit (module) according to the invention.

La figure 2 schématise l'accouplement de deux unités motrices de base autour de l'arbre intermédiaire. Elle montre aussi 1' admission par boite à clapets (cylindres du haut, vus en élévation), et l'admission par disque distributeur rotatif (cylindres du bas, vus en plan, du dessous). Figure 2 shows schematically the coupling of two basic drive units around the intermediate shaft. It also shows the inlet by valve box (upper cylinders, seen in elevation), and the inlet by rotary distributor disc (lower cylinders, seen in plan, from below).

Le module-moteur de base représenté sur la figure 1 comporte un arbre-moteur (5) possédant sa prise de force, le pignon (4), et porteur de deux embiellages à manetons en porte-à-faux (3)
Ces derniers reçoivent les bielles (7) solidaires de pistons contenus dans les cylindres (2). L'admission des gaz frais par la pipe (1), contrôlée par les clapets (11), se fait à travers la paroi (9) du carter-pompe (10).The basic motor module shown in FIG. 1 comprises a motor shaft (5) having its power take-off, the pinion (4), and carrying two cantilever crankshafts in cantilever (3)
The latter receive the connecting rods (7) integral with pistons contained in the cylinders (2). The admission of fresh gases through the pipe (1), controlled by the valves (11), is done through the wall (9) of the pump housing (10).

Dans le type d'application selon la figure 2, les deux modules moteurs de base sont disposés en V à 900. Les cylindres (2) sont alimentés par une admission du type à clapets (11), tandis que les cylindres (2') bénéficient d'une admission réglée par le disque rotatif (12) accolé à la paroi (9) et por tés par le maneton d'embiellage (3) présenté ici sans sa bielle. In the type of application according to FIG. 2, the two basic motor modules are arranged in a V to 900. The cylinders (2) are supplied by an inlet of the valve type (11), while the cylinders (2 ') benefit from an inlet regulated by the rotary disc (12) attached to the wall (9) and carried by the crank pin (3) presented here without its connecting rod.

Les deux modules engrènent sur le même arbre intermédiaire (6) gracie aux pignons (4). The two modules mesh on the same intermediate shaft (6) thanks to the pinions (4).

La figure 2 montre comment il est possible de decliner toute une gamme de moteurs en articulant les modules de base représentés sur la figure 1 autour de l'arbre intermédiaire (6) collecteur de puissance. Ainsi, si (2) et (2') étaient parallèles et de même sens, on aurait un moteur à quatre cylindres en carré tel que celui présenté sur la figure 4. Si, au lieu de 909, les cylindres étaient disposés à 1800, on aurait un moteur à quatre cylindres à plat. Si l'on dispose, engrénés entre eux en cascade, ou radialement en prise avec arbre (6) trois modules de base, on obtient un moteur à six cylindres en W. De même, on peut imaginer un huit, voire dix ou douze cylindres en étoiles, toujours par paires de deux. Dans tous les cas, le dispositif d'admission proposé, rendu possible par le type de -vilebrequin employé, permet une alimentation simple du moteur quelque soit le nombre de cylindres qu'il comporte. Figure 2 shows how it is possible to define a whole range of motors by articulating the basic modules shown in Figure 1 around the intermediate shaft (6) power collector. Thus, if (2) and (2 ') were parallel and in the same direction, we would have a four-cylinder engine in square like the one presented in figure 4. If, instead of 909, the cylinders were arranged at 1800, we would have a flat four-cylinder engine. If we have, meshed together in cascade, or radially engaged with shaft (6) three basic modules, we obtain a six-cylinder engine in W. Similarly, we can imagine an eight, even ten or twelve cylinders in stars, always in pairs of two. In all cases, the proposed intake device, made possible by the type of crankshaft used, allows a simple supply of the engine regardless of the number of cylinders it comprises.

La figure 3 donne une impression de l'aspect d'un moteur de motocyclette à quatre cylindres en V selon le schéma de principe de la figure 2. FIG. 3 gives an impression of the appearance of a motorcycle engine with four V-cylinders according to the block diagram of FIG. 2.

Le dispositif selon l'invention est destiné à réaliser des moteurs à deux temps à caractère modulaire, ou des moteurs pour lesquels l'étroitesse est Svantage, particulièrement des moteurs de bateaux hors-bord, ou des moteurs de motocyclettes destinées au tout-terrain.  The device according to the invention is intended to produce two-stroke engines of a modular nature, or engines for which the narrowness is Svantage, particularly engines of outboard boats, or engines of motorcycles intended for off-roading.

Claims (9)

REVENDICATIONS 1) Moteur polycylindrique selon le cycle à deux temps caractérisé en ce qu'il se compose d'un certain nombre d'unités motrices de base constituées comme suit; un arbre-moteur (5) porte à chacune de ses extrémités un maneton excentré (3) actionné par les bielles de deux cylindres (2) disposés en parallèle côte-à-côte. Ces vilebrequins en porte-à-faux ne comportant qu'une seule joue, la paroi extérieure (9) des carters de précompression (10) peut être percée pour recevoir le système d'admission des gaz frais au débouché du conduit (1). Entre ses manetons (3), l'arbre-moteur (5) porte le pignon (4) par quoi les unités motrices sont synchronisées et rendues solidaires d'un arbre (6) qui achemine la puissance engendrée aux organes de transmission. 1) Polycylindrical engine according to the two-stroke cycle characterized in that it consists of a certain number of basic drive units constituted as follows; a motor shaft (5) carries at each of its ends an eccentric crankpin (3) actuated by the connecting rods of two cylinders (2) arranged in parallel side-by-side. These cantilever crankshafts having only one cheek, the outer wall (9) of the precompression housings (10) can be pierced to receive the fresh gas intake system at the outlet of the conduit (1). Between its crank pins (3), the motor shaft (5) carries the pinion (4) whereby the drive units are synchronized and made integral with a shaft (6) which routes the power generated to the transmission members. 2) Moteur selon la revendication 1 caractérisé en ce qu'il n'utilise qu'une seule unité motrice de base, ce qui en fait un bicylindre. 2) Engine according to claim 1 characterized in that it uses only one basic power unit, which makes it a twin. 3) Moteur selon la revendication 1 caractérisé en ce qu'il utilise deux unités motrices de base, disposées en V. 3) Motor according to claim 1 characterized in that it uses two basic drive units, arranged in V. 4) Moteur selon la revendication 1 caractérisé en ce qu'il utilise deux unités motrices de base côte-à-côte et parallèles suivant la disposition dite: "quatre cylindres en carré". 4) Motor according to claim 1 characterized in that it uses two basic drive units side by side and parallel according to the so-called arrangement: "four cylinders in square". 5) Moteur selon la revendication 1 caractérisé en ce qu'il utilise trois unités motrices de base disposées radialement suivant la disposition dite: "six cylindres en W". 5) Engine according to claim 1 characterized in that it uses three basic drive units arranged radially in the arrangement called: "six cylinders in W". 6) Moteur selon la revendication 1 caractérisé en ce qu'il utilise deux unités motrices de base opposées suivant la disposition dite: "quatre cylindres à plat". 6) An engine according to claim 1 characterized in that it uses two opposite basic drive units according to the so-called arrangement: "four cylinders flat". 7) Moteur selon la revendication 1 caractérisé en ce qu'il utilise quatre unités motrices de base disposées radialement suivant la disposition "en étoile". 7) Motor according to claim 1 characterized in that it uses four basic drive units arranged radially in the "star" arrangement. 8) Moteur selon l'une quelconque des revendications précédentes caractérisé en ce que l'admission des gaz frais dans le carter de précompression est contrôlée par une valve à clapet (11). 8) Engine according to any one of the preceding claims, characterized in that the admission of fresh gases into the precompression housing is controlled by a flap valve (11). 9) Moteur selon l'une quelconque des revendications de 1 à 7 incluse caractérisé en ce que l'admission des gaz frais dans le carter-pompe est contrôlée par un distributeur rotatif (12).  9) Engine according to any one of claims 1 to 7 inclusive, characterized in that the admission of fresh gases into the pump housing is controlled by a rotary distributor (12).
FR8804977A 1988-04-11 1988-04-11 Compact modular multi-cylinder two-stroke engine Withdrawn FR2629865A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8804977A FR2629865A1 (en) 1988-04-11 1988-04-11 Compact modular multi-cylinder two-stroke engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8804977A FR2629865A1 (en) 1988-04-11 1988-04-11 Compact modular multi-cylinder two-stroke engine

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FR2629865A1 true FR2629865A1 (en) 1989-10-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467061A1 (en) * 2003-04-08 2004-10-13 Tecumseh Products Company Modular internal combustion engines
US6941914B2 (en) 2002-04-15 2005-09-13 Tecumseh Products Company Internal combustion engine
FR2948416A1 (en) * 2009-07-21 2011-01-28 Marc Ladier Four-stroke bi-cylinder internal combustion engine for car, has rods articulated on crank pins, and secondary shaft coupled with countershaft allowing mechanical transmission between pedals and camshaft
WO2011144188A1 (en) * 2010-05-17 2011-11-24 Hyon Engineering Gmbh Internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6904883B2 (en) 2002-04-15 2005-06-14 Tecumseh Products Company Modular internal combustion engines
US6941914B2 (en) 2002-04-15 2005-09-13 Tecumseh Products Company Internal combustion engine
EP1467061A1 (en) * 2003-04-08 2004-10-13 Tecumseh Products Company Modular internal combustion engines
FR2948416A1 (en) * 2009-07-21 2011-01-28 Marc Ladier Four-stroke bi-cylinder internal combustion engine for car, has rods articulated on crank pins, and secondary shaft coupled with countershaft allowing mechanical transmission between pedals and camshaft
WO2011144188A1 (en) * 2010-05-17 2011-11-24 Hyon Engineering Gmbh Internal combustion engine

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