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
  • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
  • F01B3/04—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis the piston motion being transmitted by curved surfaces
• • 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
  • F01B7/00—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
• • 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
  • F01B7/00—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
  • F01B7/02—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons
• • 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
  • F01B7/00—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
  • F01B7/02—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons
  • F01B7/04—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons acting on same main shaft
• • 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
  • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00
  • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft
  • F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces
• • 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
  • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
• • 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
  • F02B75/28—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
  • F02B75/282—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders the pistons having equal strokes

Definitions

• the present invention relates to the general technical field of motors, and in particular engines whose operation is based on the variation of volume of a chamber (for example by compression and expansion of a working fluid within the chamber) such engines providing mechanical energy usable for example to propel vehicles (such as automobiles, motorcycles, aircraft or boats), to animate machines (industrial or agricultural), or to provide mechanical energy energy conversion devices, like generators.
• the invention more specifically relates to an engine comprising at least the following three components:
• a cylinder which contributes to delimiting a chamber whose volume varies between a minimum value and a maximum value
• a first piston also contributing to delimiting said chamber, said first piston and cylinder being designed to undergo a first relative back-and-forth movement under the effect of the variation of the volume of the chamber, and an output shaft rotary.
• Engines implementing a chamber whose volume variation is used to supply mechanical energy to a receiving system are known for a long time and widespread, since internal combustion engines (or “engines engines"), which equip the cars, based on such a principle of operation.
• the architecture of these engines is generally based on the implementation of a cylinder which is closed in its upper part by a cylinder head.
• the cylinder and the cylinder head form a combustion chamber whose volume is defined by the stroke of a piston sliding in the cylinder in a reciprocating movement imparted by the pressure variations resulting from the combustion cycles operated in the chamber. of combustion.
• the piston is itself connected to a crankshaft, via a connecting rod, to transform the rectilinear translation movement of the piston into rotational movement of the crankshaft.
• This known engine architecture generally gives satisfaction, but has no less serious disadvantages.
• these known motors implement a relatively heavy and complex mechanical and kinematic chain of transmission and force transfer between the pistons and the output shaft. This is, of course, a potential source of failure and loss of energy efficiency, and is not intended to increase reliability or reduce cost.
• these known motors implement a large number of moving parts, which corresponds to a large moving mass, again likely to cause problems of efficiency and reliability.
• These known engines also prove to be also relatively heavy and bulky, so that their location within a vehicle, and particularly within a motor vehicle of the particular car type can be problematic, especially with respect to correct positioning of the center of gravity of the engine in the vehicle.
• the efficiency of these known engines is not optimal in the different modes of use of the engine, which leads to overconsumption of fuel. In order to remedy this latter problem, it has been proposed to adapt the volume of the combustion chamber according to the level of stress on the engine.
• variable compression ratio engines for “variable compression ratio” engines
• VCR variable compression ratio engines
• VCR variable compression ratio engines
• variable compression engines allow an optimization of the efficiency compared to conventional explosion engines, and avoid (or at least minimize) the appearance of undesirable phenomena such as rattling.
• the known variable compression engines also suffer from the drawbacks mentioned above with regard to conventional combustion engines.
• the invention therefore aims to remedy the various disadvantages listed above and to propose a new engine whose performance is optimized and whose architecture is particularly simple, lightweight and reliable.
• Another object of the invention is to provide a new construction engine particularly compact and robust.
• Another object of the invention is to propose a new engine of particularly simple design and easy to manufacture.
• Another object of the invention is to propose a new motor which is economical to manufacture.
• Another object of the invention is to propose a new engine whose operation is based on simple and proven mechanical principles.
• Another object of the invention is to propose a new motor whose construction particularly limits the occurrence of undesirable vibratory and acoustic phenomena.
• Another object of the invention is to propose a new engine implementing a minimum moving mass and likely to provide large intake and / or exhaust sections.
• Another object of the invention is to propose a new engine that implements a minimum of different parts.
• the objects assigned to the invention are achieved by means of an engine comprising at least the following three components:
• a cylinder which contributes to delimiting a chamber whose volume varies between a minimum value and a maximum value; a first piston also contributing to delimiting said chamber, said first piston and cylinder being designed to undergo a first relative movement of value; and come under the effect of the variation of the volume of the chamber,
• said motor further comprising:
• a second piston which also contributes to delimiting the volume of said chamber, said second piston and cylinder being designed to undergo a second relative back-and-forth movement under the effect of the variation of the volume of the chamber; outlet being mounted coaxially with said first and second pistons,
• a first means of converting said first relative reciprocating movement into rotary movement of the output shaft comprising on the one hand a first substantially corrugated guide path integral with one of said three components and on the other a first guide member which is adapted to move along said first guide path and which is integral with another one of said three components,
• a first member for adjusting the position of the first guide path and / or the first guide element relative to the component (s) of which it (they) is (are) integral, to set the minimum value; and / or the maximum value of the volume of the chamber.
• FIG. 1 is a block diagram, according to a side view in partial section, of an exemplary motor according to the invention.
• FIG. 2 illustrates, in a partial sectional side view, an example of a combustion engine according to the invention, corresponding to the constructive principle of Figure 1.
• Figure 3 illustrates, in a perspective view, the engine of Figure 2 without its cylinder.
• Figure 4 illustrates, in a perspective view, a design detail of the engine of Figures 2 and 3.
• the invention relates to an engine, that is to say a device capable of providing a mechanical work usable in particular for propelling a vehicle, and for example a motor vehicle, a motorcycle, an aircraft or a boat, or for operating a machine (machine tool, public works machine, agricultural machine, pump, compressor) or an energy conversion device, such as a generator.
• a machine machine tool, public works machine, agricultural machine, pump, compressor
• an energy conversion device such as a generator.
• the engine 1 preferably constitutes an internal combustion engine (“internal combustion engine”), that is to say a motor capable of to produce mechanical energy from the combustion therein of a working fluid containing a fuel, and for example a hydrocarbon-based fuel such as gasoline.
• internal combustion engine that is to say a motor capable of to produce mechanical energy from the combustion therein of a working fluid containing a fuel, and for example a hydrocarbon-based fuel such as gasoline.
• the invention is however not limited to combustion engines and may relate to a motor whose operation is not based on the combustion of a fuel, as is the case for example with compressed air engines.
• the engine 1 comprises at least the following three components: a cylinder 2, a first piston 4 and a rotary output shaft 8.
• the cylinder 2 contributes to delimit a chamber 3 whose volume varies between a minimum value and a maximum value.
• the volume of the chamber 3 varies cyclically during the operation of the engine 1, so that the volume of the chamber 3 passes alternately and continuously from its minimum value to its maximum value and vice versa.
• the chamber 3 forms a combustion chamber designed to accommodate a working fluid intended to undergo combustion within said chamber 3.
• the working fluid is therefore in this case a combustible fluid and it is preferably formed of a gas consisting of a mixture of air and vaporized fuel. This gas is intended to undergo a rapid combustion, and more precisely an explosion (or even more precisely a deflagration), within the chamber 3.
• the fuel may for example consist of a petroleum derivative, it being understood that the invention is absolutely not limited to a specific working fluid.
• the variation of the volume of the chamber 3 is thus generated, in the example illustrated in the figures and as is well known per se, by the variation of the volume of the working fluid present in the chamber 3, under the effect of the combustion phenomenon (which causes a relaxation of the working fluid).
• the cylinder 2 is for example, as illustrated in the figures, in the form of a hollow tube, preferably rectilinear, of longitudinal axis X-X 'extension.
• the cylinder 2 has a substantially circular section. It is however quite possible that the cylinder 2 has a non-circular section, and for example a polygonal section, without departing from the scope of the invention.
• the inner wall 20 of the cylinder 2 contributes to define, in the embodiment illustrated in the figures, the chamber 3.
• the cylinder 2 is preferably made of a material having a high mechanical and thermal strength, such as for example a metal material of the cast iron or aluminum alloy type, so as to overcome the thermal and mechanical stresses resulting fuel combustion within the chamber 3.
• the first piston 4 also contributes to defining the volume of the chamber 3, said first piston 4 and cylinder 2 being designed to undergo a first relative movement back and forth under the effect of the variation of the volume of the chamber 3
• the invention provides in particular one or the other of the following constructive configurations:
• - Configuration A the cylinder 2 is stationary (stationary) while the first piston 4 is movably mounted relative to the cylinder 2 to move in a reciprocating (reciprocating) movement with respect to said cylinder 2.
• - Configuration B the first piston 4 is stationary (stationary) while the cylinder 2 is movably mounted relative to the first piston 4 to move in a reciprocating (reciprocating) movement with respect to said first piston 4.
• the first piston 4 is designed to slide in the cylinder 2 in a reciprocating movement under the effect of the volume variation of the chamber 3.
• the first piston 4 is threaded inside the cylinder 2 and is tightly fitted against the inner wall 20 of the cylinder 2, so as to slide within the cylinder 2 along the axis X-X ', while remaining permanently in sealing contact with the inner wall 20 of said cylinder 2.
• the configuration A is very particularly preferred because it allows easy implementation of the engine 1, and is generally more reliable and easy to manufacture than the configuration B. realization of the sealed contact between the first piston 4 and the inner wall 20 of the cylinder 2 can be achieved by any means known to those skilled in the art, taking up and adapting for example the well known technical solutions and proven in the prior art.
• the first piston 4 advantageously has a head 4A which contributes to delimit the chamber 3.
• the head 4A preferably has a cross section which is complementary to the internal cross section of the cylinder 2, this section preferably being a circular section as in the examples illustrated in the figures.
• the first piston 4 further comprises a skirt 4B which extends from and to the periphery of the head 4A.
• the first piston 4 has a longitudinal axis of extension Y-Y ', which corresponds to the axis of symmetry of the cross section of the head 4A of said piston.
• the axis longitudinal YY 'of the first piston 4 is advantageously merged with the extension axis XX' of the cylinder 2 when the first piston 4 is installed in the operative position inside the cylinder 2, as illustrated in FIG.
• the first piston 4 is designed to slide in the cylinder 2 according to a pure axial translation movement, that is to say that said first piston 4 is guided relative to the cylinder 2 to be able to move in longitudinal translation, parallel to the axis X-X ', without rotation of the first piston 4 on itself.
• the first piston 4 is in this case mechanically linked to the cylinder 2 by a slide connection.
• this sliding connection which allows the first piston 4 to slide in the cylinder 2 in a substantially pure rectilinear translational movement, is achieved by the cooperation of at least one slide 4C mounted on the first piston 4 and a corresponding slide 2A formed in the cylinder 2 and extending substantially parallel to the axis XX 'longitudinal extension of said cylinder 2.
• the first piston 4 is provided with two sliders arranged diametrically opposite on the piston relative to the axis YY 'of symmetry of this last.
• each slide advantageously comprises a roller 4OC rotatably mounted on an axis 400C itself mounted in an orifice formed through the skirt. 4B, so that said axis 400C extends substantially radially relative to the extension axis XX 'of the first piston 4.
• Each roller 4OC is designed to roll in the corresponding slide 2A, which advantageously consists, as illustrated in the figures, in a rectilinear groove formed in the inner wall 20 of the cylinder 2, on the surface of said inner wall 20, facing the corresponding roller.
• the invention is however absolutely not limited to the implementation of a first piston 4 mounted in a slide connection in the cylinder 2. It is for example quite possible without leaving the frame of the invention, the first piston 4 undergoes, during its movement back and forth, a rotation on itself about its axis YY ', so that the movement of the first piston 4 in the cylinder 2 is in this case not a pure axial translation movement but a helical translation movement (sub-configuration A2).
• the rotary output shaft 8 preferably has a rectilinear character and extends along a longitudinal axis Z-Z ', in which it is designed to rotate.
• the output shaft 8 is preferably mounted coaxially with the first piston 4, so that the X-X ', Y-Y' and Z-Z 'axes are advantageously combined.
• the output shaft 8 passes through the first piston 4, that is to say that said first piston
• the first piston 4 is threaded on the output shaft 8.
• the first piston 4 is provided with an orifice through which the output shaft 8 passes, the interface between the first piston 4 and the output shaft 8 preferably being waterproof.
• the engine 1 comprises a first conversion means of said first relative reciprocating movement in rotary motion of the output shaft 8, and more preferably in continuous rotary motion, in a single direction of rotation. , of the output shaft 8.
• the first conversion means comprises on the one hand a first substantially corrugated guide path 9 integral with one of said three components (cylinder 2, first piston 4 or output shaft 8) and on the other hand a first guide element 10 which is adapted to move along said first guide path 9 and which is integral with another one of said three components.
• the invention thus relates to several constructive variants, the main ones are summarized in Table 2 below.
• the cooperation between the first guide path 9 and the first guide element 10 is reciprocal, that is to say that it not only makes it possible to convert the relative reciprocating movement of the piston 4 / 2 cylinder in rotary motion of the output shaft 8, but also to convert the rotary motion of the output shaft 8 in relative motion of reciprocating piston 4 / cylinder 2.
• the example illustrated in the figures corresponds to variant A11 of Table 2 above.
• the output shaft 8 is fitly fitted into the central orifice formed through the first piston 4 to allow the latter to slide along the output shaft 8 while remaining in sealing contact with said output shaft 8, and thus avoid any communication between the inside of the chamber 3 and the outside through the interface between the output shaft 8 and the first piston 4.
• the first path guide 9 is integral with the output shaft, while the first guide element 10 is integral with the first piston 4.
• the first piston 4 itself drives in rotation the output shaft 8, which constitutes the drive shaft to be connected to the object to be driven, for example to the wheels of a motor vehicle.
• Such a design avoids the implementation of force references according to different work axes, as in the prior art, and allows on the contrary a direct transmission of the action of the first piston 4 on the output shaft 8.
• the first piston 4 directly drives the output shaft 8 in rotation, which gives the engine 1 a particularly compact character, the latter can thus be easily integrated into the chassis of a vehicle.
• Such a design is also likely to improve the center of gravity of the vehicle due to the essentially longitudinal nature of the engine 1, which allows the positioning of said engine 1 along the axis of symmetry of said vehicle.
• the first guide path 9 has a substantially sinusoidal shape. More precisely, in the example illustrated in the figures, the first guide path 9 extends along an annular profile around the longitudinal axis of extension ZZ 'of the output shaft 8.
• the first guide path 9 comprises a first groove while the first guide member 10 comprises a first finger which protrudes from the first piston 4 and engages in said first groove.
• the first guide element 10 comprises two fingers arranged diametrically opposite relative to the axis YY 'and engaging the same first groove.
• the first finger advantageously comprises a roller 10A rotatably mounted on an axis itself mounted in an orifice formed through the skirt 4B, so that that said axis extends substantially radially relative to the axis of extension XX 'of the piston 4.
• the axis in question corresponds to the axis 400C on which is mounted the roller 4OC.
• the roller 10A is mounted on the axis 400C, inside the skirt 4B, to engage the corresponding sinusoidal groove, while the roller 4OC is mounted on the same axis 400C, outside the skirt 4B, to engage the corresponding rectilinear groove 2A.
• the motor 1 further comprises a first member 5 for adjusting the position of the first guide path 9 and / or the first guide element 10 relative to the component (s) of which it (s) is (are) integral (s), to set the minimum value and / or the maximum value of the volume of the chamber 3.
• the invention therefore relates in particular to the alternative sub-variants mentioned in Table 3 below.
• the invention is thus based on the idea of adjusting the position of the guide path 9 and / or the guide element 10 to adjust the volume of the chamber 3, which allows to adjust in particular the compression ratio.
• the invention makes it possible to obtain a variable compression ratio motor 1 of particularly simple, compact and reliable construction.
• acting directly on the position of the guide path 9 and / or the guide element 10 proves to be a particularly simple and effective technical measure for accurately adjusting the compression ratio, even during operation. of the engine 1.
• the exemplary embodiment illustrated in the figures corresponds to the subvariant A111 (see Table 3 above).
• the first adjustment member 5 is designed to adjust the position of the first path of 9 relative to the output shaft 8, which means that the first guide path is movable relative to said output shaft 8, while being attached thereto to transmit to the shaft 8 the movement (converted) of the first piston 4.
• the guide element 10 is in turn fixed in position relative to the component that carries it, namely the first piston 4.
• the adjustment member 5, allowing to adjust the position of the first guide path 9 relative to the output shaft 8, makes it possible to set both the minimum value and the maximum value of the volume of the chamber 3.
• the first piston 4 performs a back-and-forth movement of predetermined amplitude (imparted by the shape of the guide path 9) around a median position.
• the adjustment member 5 is designed in this case to move this median position, which amounts to shift the alternating stroke of the first piston 4 and thus to simultaneously change the minimum value and the maximum value of the volume of the chamber 3.
• the invention is not limited to such a mode of operation and it is quite possible that the adjustment member 5 acts only on the maximum value or on the minimum value of the volume of the chamber 3, by example by operating in a timely manner a displacement of the guide path 9 (and / or the guide member 10) to maintain the minimum value or the maximum value constant.
• the first adjustment member 5 advantageously comprises a first adjustment piece 6 (shown only in FIG. 4) slidably mounted on and along the length output shaft 8, said first piece 6 carrying the first guide path 9.
• the first guide piece 6 is advantageously in the form of a sleeve 6A which extends longitudinally along a WW axis. Said sleeve 6A is threaded onto the output shaft 8, coaxially with the latter, so that the X-X ', Y-Y', ZZ 'and WW axes are substantially merged.
• the sleeve 6A is guided in a pure axial translation movement on the output shaft 8, that is to say that the output shaft 8 and the sleeve 6A are connected by a mechanical link of the slide type.
• the sleeve 6A is for example provided with an oblong hole 7, which is intended to cooperate with a pin 17 fixed directly on the output shaft 8 and protruding radially from the latter.
• the pin 17 is received in the oblong hole 7, so that the cooperation between the pin 17 and the oblong hole 7 provides a guide in translation of the sleeve 6A on the output shaft 8.
• the sleeve 6A can thus slide on the output shaft 8, in a race whose amplitude corresponds to the length of the oblong hole 7.
• the length of the oblong hole 7 is in turn determined with respect to the desired adjustment range of the minimum and maximum values of the volume of the room 3.
• the first adjustment member 5 comprises firstly a threaded well 18 which is fixed to the cylinder 2 and which is coaxial with the output shaft 8 and on the other hand a threaded tube 19 attached at a first end thereof to the first adjusting member 6, said threaded tube 19 being capable of being screwed and unscrewed into the threaded well 18 to vary the position of the first piece 6 relative to the output shaft 8, which is fixedly mounted relative to the cylinder 2. More specifically, the threaded tube 19 is threaded coaxially on the output shaft 8, so as to freely rotate relative thereto around of the Y-Y 'axis.
• the tube 19 is preferably provided, towards its end attached to the first adjusting member 6, a needle stop 19A which provides the connection between the threaded tube 19 and the sleeve 6A.
• the second end of the threaded tube 19, opposite the first end attached to the sleeve 6, is provided with a gear 19B for driving in rotation of the threaded tube 19.
• This toothed wheel 19B is it - Even designed to be rotated by a control system (not shown in the figures) mechanical and / or electrical.
• the control system may for example comprise an electric motor provided with a pinion which meshes with the toothed wheel 19B.
• the control system can draw its motive power directly from the output shaft 8.
• the engine 1 comprises a management module of the control system of the gear wheel 19B, said management module being preferably designed to automatically adjust, continuously and permanently the compression ratio (by setting the minimum and / or maximum values of the volume of the chamber 3) as a function of the stresses and / or the speed of the engine 1, to optimize in particular the torque, the speed and the efficiency of the engine 1.
• the management module preferably comprises for this purpose sensors that collect information on the instantaneous operation of the engine 1 and a computer (microprocessor) that processes this information to provide to the control system an order of rotation of the toothed wheel19B in one direction or the other, to change the position of the travel path guidance 9 and thus the compression ratio of the engine 1.
• the computer can thus be programmed to greatly increase the compression ratio at the beginning of acceleration, so that the engine 1 provides a high torque, then reduce the rate of compression. compression to regain torque at high speed.
• the engine 1 comprises a second piston 14 which also contributes to defining the volume of the chamber 3, said second piston 14 and cylinder 2 being designed to undergo a second relative movement back and forth under the effect of the variation of the volume of the chamber 3.
• the engine 1 thus comprises in this case a cylinder 2 in which the first and the second piston 4, 14 are mounted to slide axially.
• the chamber 3 is preferably formed by the interstitial space separating the first and the second piston 4, 14 in the cylinder 2.
• the chamber 3 corresponds in this case to the free space of variable volume located inside the cylinder 2, between the pistons 4, 14.
• the first and second pistons 4 , 14 are mounted in opposition within the cylinder 2, that is to say so that their respective heads 4A, 14A face each other.
• the chamber 3 thus extends in the space delimited axially by the heads 4A, 14A of the first and second pistons 4, 14 and radially by the internal wall 20 of the cylinder 2 extending between said heads 4A, 14A of said pistons 4, 14.
• the chamber 3 thus has a variable volume which depends on the relative position of the first and second piston 4, 14.
• the first piston 4 and the second piston 14 are designed to move according to movements counter-movement in the cylinder (which is in this case fixed), so that said pistons 4, 14 move toward and away from each other substantially simultaneously (the first and second movements back and forth are opposed).
• the first piston 4 and the second piston 14 move symmetrically with respect to the median plane of the chamber 3, perpendicular to the axis X-X '.
• each piston 4, 14 is designed to move in the cylinder 2 individually, that is to say independently of the other piston 14, 4.
• the second piston 14 is identical to the first piston 4 and it is also mounted in the motor 1 identically to said first piston 4.
• the output shaft 8 is also mounted coaxially with the second piston 14, the output shaft 8 and the second piston 14 cooperating to convert the movement of the second piston 14 into rotary movement of the output shaft 8.
• the engine 1 comprises a second conversion means of said second relative movement of va-and - comes in rotary motion of the output shaft 8.
• Said second conversion means comprises on the one hand a second substantially corrugated guide path 15 integral with one of the following three elements: cylinder 2, output shaft 8 and second piston 14 and secondly a second guide element 16 which is adapted to move along said second guide path 15 and which is integral with another of said three elements.
• said motor 1 further comprises a second adjustment member 50 for the position of the second guide path 15 and / or the second guide element 16 relative to the element (s) of which it (s) is (are) integral, to adjust the minimum value and / or the maximum value of the volume of the chamber 3.
• the motor 1 has an overall symmetry with respect to the median plane of the chamber 3, c that is to say the plane passing through the center of the chamber 3 and which is perpendicular to the axis XX 'of longitudinal extension of the cylinder 2.
• first and preferably second adjustment means 5, 50 for acting on the available volume of the chamber 3, and thus on the compression ratio.
• two pistons 4, 14 to define the same chamber 3 also allows, by acting symmetrically on the pistons 4, 14, to benefit from a large amplitude variation of compression ratio without imparting a significant displacement piston stroke, since each piston contributes half to the variation of the compression ratio.
• the invention also relates as such to a vehicle, of the motor vehicle type, equipped with a motor 1 according to the invention.
• the invention finds its industrial application in the design, manufacture and use of motors.

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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)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Transmission Devices (AREA)

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• 2008
  • 2008-03-17 FR FR0801437A patent/FR2928694A1/fr not_active Withdrawn
• 2009
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  • 2009-03-17 BR BRPI0909496-2A patent/BRPI0909496B1/pt active IP Right Grant
  • 2009-03-17 CN CN200980109539.8A patent/CN101983278B/zh active Active
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