Abstract: The sealing device (1) for a piston (2) of which the fixed skirt (5) moves in a cylinder (8) includes a sliding skirt (6) traversed axially by a pressure transmission channel (10) and connected to the fixed skirt (5) by a mechanical inter-skirt connection (7) whilst an extensible continuous segment (9) is interposed in a sealed manner between the skirts (5, 6) and can come into contact with the cylinder (8) when its internal cylindrical segment face (12) is subjected to the pressure of a fluid (36) via the pressure transmission channel (10), a sliding skirt spring (16) tending to bring the skirts (5, 6) closer and to axially compress the extensible continuous segment (9) between the skirts (5, 6).

Abstract: A tubular valve for adjusting the compression ratio of a variable compression ratio engine includes a straight tube capable of longitudinal translational movement in a valve casing including a low-pressure chamber, the straight tube including a first end opening into the low-pressure chamber and a second end opening into a high-pressure chamber, the second end adapted to contact with at least one shut-off surface secured to the valve casing to seal the second end, the straight tube contacting the shut-off surface by at least one nonreturn and shut-off spring; sealing element for sealing between the external surface of the straight tube and the valve casing isolating the high-pressure chamber from the low-pressure chamber, the sealing element including a nonreturn tube inside which the straight tube is held; and an electric actuator for applying to the straight tube a force opposing that of the spring.

Abstract: An electrohydraulic device for controlling the compression ratio of a variable compression-ratio engine, includes at least one dual-flow electrovalve (81) with no check valve and capable of opening and closing at least one hydraulic fluid duct (83) between the upper chamber (121) and the lower chamber (122) of a control jack (8), at least one position sensor (82) of a control rack (7), an angular position sensor (88) of the crankshaft (9) of the engine for adjusting the compression ratio, and at least one calculator (84).

Abstract: The inventive turbo supercharging device with air bleed and regeneration (1) for an alternating internal combustion heat engine (2) includes a regenerating exchanger (31) in which the exhaust gases expelled by the engine (2) circulate, the latter transferring their heat to other gases expelled by a centrifugal power compressor (21) before the latter are expanded by a power turbine (27) that rotates the compressor (21), then are cooled in the regenerating exchanger (31) while transferring their heat to the gases expelled by the compressor (21).

Abstract: The fixed or variable displacement hydraulic motor-pump (1) includes a motor-pump central rotor (3) in which a hydraulic cylinder (14) is arranged, the rotor (3) being in sealed contact with an input-output spool valve (43) connecting the cylinder (14) with a motor-pump frame (2) while a hydraulic piston (13) moves in the cylinder (14) to push, using a hydraulic piston guided plunger (18), a tangential arm (22) articulated in the central rotor (3), and a tangential arm antifriction roller (28) on a motor-pump peripheral rotor (29) synchronized in rotation with the motor-pump central rotor (3).

Abstract: The fixed or variable displacement hydraulic motor-pump (1) includes a motor-pump central rotor (3) in which a hydraulic cylinder (14) is arranged, the rotor (3) being in sealed contact with an input-output spool valve (43) connecting the cylinder (14) with a motor-pump frame (2) while a hydraulic piston (13) moves in the cylinder (14) to push, using a hydraulic piston guided plunger (18), a tangential arm (22) articulated in the central rotor (3), and a tangential arm antifriction roller (28) on a motor-pump peripheral rotor (29) synchronized in rotation with the motor-pump central rotor (3).

Abstract: The fixed or variable displacement hydraulic motor-pump (1) includes a motor-pump central rotor (3) in which a hydraulic cylinder (14) is arranged, the rotor (3) being in sealed contact with an input-output spool valve (43) connecting the cylinder (14) with a motor-pump frame (2) while a hydraulic piston (13) moves in the cylinder (14) to push, using a hydraulic piston guided plunger (18), a tangential arm (22) articulated in the central rotor (3), and a tangential arm antifriction roller (28) on a motor-pump peripheral rotor (29) synchronized in rotation with the motor-pump central rotor (3).

Abstract: The elastic fixing for a piston (2) of a variable compression ratio engine (10) includes at least one metal rod (15) kept under tension between the piston (2) and the transmission member (3) and which applies a strong contact pressure between the base of the piston (2) and the top face of the transmission member (3), the piston (2) being tightened according to a previously calculated angle enabling the metal rod (15) consisting of a stud (16) to be subjected to a desired tension force and the tightening prestress to be reached between the piston (2) and the transmission member (3), and indexed in rotation relative to the transmission member (3), by an additional tightening which does not significantly increase the tightening pre-stress, the stud (16) continuing to elongate with the same tension force by plastic deformation.

Abstract: A high-pressure spark-ignition and stratification device (2) for internal combustion engine (1) includes: a stratification valve (20) closing a stratification conduit (23) which opens into a stratification prechamber (79), the conduit also opening into a stratification chamber (24) connected by a stratification injection conduit (39) to the combustion chamber (9) of the internal combustion engine (1), the conduit opening near protruding electrodes (26) of a spark plug (25), the electrodes being positioned in the combustion chamber; a stratification actuator (27) responsible for lifting the stratification valve (20); a stratification line (28) connecting the stratification prechamber (79) to the outlet of a stratification compressor (29); a stratification fuel injector (33); elements for recirculating previously cooled exhaust gases (40).

Abstract: The high-pressure spark and stratification ignition device (2) for an internal combustion engine (1) includes: a stratification valve (20) closing the end of a stratification conduit (23), opening into the combustion chamber (9) of the internal combustion engine (1), and connecting the latter to a stratification chamber (24); a spark plug (25) housed in the stratification valve (20); a stratification actuator (27) responsible for lifting the stratification valve (20); a stratification line (28) connecting the stratification chamber (24) to the outlet of a stratification compressor (29); a stratification fuel injector (33); and elements for recirculating previously cooled exhaust gases (40).

Abstract: A clip-fastened raceway for a variable compression ratio engine includes: at least one curved segment whose outer surface cooperates with a raceway housed in the transmission member or in the control member of the variable compression ratio engine and whose inner surface is maintained in contact with a curved outer surface housed in the toothed wheel of the engine; at least one clip, housed in at least one of the ends of the curved segment and fastened to one or the other of the ends of the curved outer surface housed in the toothed wheel and hooking onto a hook or protrusion which the wheel includes in the vicinity of the end of its curved outer surface, the hook or protrusion being complementary to that of the clip so as to be able to cooperate with the latter.

Abstract: A ball-lift device with screw for a variable compression ratio engine having a hydraulic double-acting control actuator (8) including an upper chamber (121) and a lower chamber (122) and at least one actuator piston (13) connected to a control rack (7) includes: at least two balls (401, 402) or valve elements each resting on a seat (403, 404) and closing off respectively one and the other end of a transfer channel (405) connecting the upper chamber and the lower chamber of the control actuator, the balls acting as a nonreturn valve element when they are held on their seat by a spring (408, 409) in order to allow the hydraulic fluid to pass in only one direction; and lifting element (410) including at least one electric motor (480) designed to rotate at least one screw (481, 482) making it possible to lift from or place on its seat at least one ball.

Abstract: An electrohydraulic valve actuator with cylinder and reciprocating cam includes: a valve-actuating hydraulic cylinder (2) which opens a valve of an internal combustion engine (100) via a valve-opening solenoid valve (4), a valve-opening high-pressure duct (11), and an incoming high-pressure hydraulic circuit (5), and which closes the valve via a valve-closing solenoid valve (6), a valve-closing high-pressure duct (12) and an outgoing high-pressure circuit (7), a hydraulic positive displacement pump (8) cooperating with a pump non-return valve (14) and a pump outlet sealing solenoid valve (13) and the outlet of which is connected to a low-pressure circuit (9) and to a low-pressure reservoir (10) supplied by a replenishing pump (52) and a replenishing reservoir (53).

Abstract: A device for adjusting the compression ratio of a variable compression ratio engine including a hydraulic double-acting control actuator (8) including an upper chamber (121) and a lower chamber (122) and at least one actuator piston (13) connected to a control rack (7) includes: at least two balls (401, 402) or valve elements each resting on a seat (403, 404) and closing off respectively one and the other end of a transfer channel (405) connecting the upper chamber and the lower chamber of the control actuator; and lifting elements (410) making it possible to raise the balls from their seat so that the balls allow the hydraulic fluid to pass in both directions.

Abstract: A tubular valve for adjusting the compression ratio of a variable compression ratio engine includes: at least one straight tube capable of longitudinal translational movement in a valve casing including a low-pressure chamber, the straight tube including a first end opening into the low-pressure chamber and a second end opening into a high-pressure chamber, the second end adapted to contact with at least one shut-off surface secured to the valve casing to seal the second end, the straight tube contacting the shut-off surface by at least one nonreturn and shut-off spring; sealing element for sealing between the external surface of the straight tube and the valve casing isolating the high-pressure chamber from the low-pressure chamber, the sealing element including a nonreturn tube inside which the straight tube is held; at least one electric actuator for applying to the straight tube a force opposing that of the spring.

Abstract: An electromechanical device (800) which can be used to control the compression ratio of a variable compression ratio engine, includes mechanical elements for transmitting movement (801) between at least one electric engine (802) and at least one control rod (20) of a control jack (8) of a control device (12) for adjusting the vertical position of a control rack (7) of the variable compression ratio engine.

Abstract: A device for measuring the effective volumetric ratio of at least one cylinder in a variable compression-ratio engine, includes at least one target passage sensor (91) attached on the cylinder casing (100) and detecting the passage of at least one target (92) connected to the piston (2) of the engine, the target passage sensor interacting with at least one angular position sensor of the crankshaft (93) of the engine, and one calculator (94).

Abstract: The elastic fixing for a piston (2) of a variable compression ratio engine (10) includes at least one metal rod (15) kept under tension between the piston (2) and the transmission member (3) and which applies a strong contact pressure between the base of the piston (2) and the top face of the transmission member (3), the piston (2) being tightened according to a previously calculated angle enabling the metal rod (15) consisting of a stud (16) to be subjected to a desired tension force and the tightening prestress to be reached between the piston (2) and the transmission member (3), and indexed in rotation relative to the transmission member (3), by an additional tightening which does not significantly increase the tightening pre-stress, the stud (16) continuing to elongate with the same tension force by plastic deformation.

Abstract: A pressure device maintains the raceways (48, 160 to 165) of the main moving components (3, 5, 7 and 40) of a variable compression ratio engine permanently in contact with one another and with the faces on which they rest in a cylinder case. The inventive device includes pressure elements which are solidly connected to the cylinder case (100) and which exert a pressure force on a control rack (7) having a toothed segment (75) formed by teeth (74). The pressure force is applied against a support surface (78) provided on the lower part of the rack (7).

Abstract: A double-acting piston compressor (1) includes at least one cylinder (3) in which a double-acting piston (4) moves, the cylinder (3) and the piston (4) jointly defining an upper chamber (5) and a lower chamber (6) each provided with at least one intake duct (7) and at least one delivery duct (8), and each duct including at least one valve (90, 91), and a linking rod (10) connecting the double-acting piston (4) to a transmission member (11) collaborating, on the one hand, with a guide roller (12) and, on the other hand, with a pinion (15), at least one anchoring member (22) collaborating with the pinion (15), a connecting rod (25) to which the pinion (15) is articulated by a pivot pin (26), the connecting rod (25) being connected to the crank (28) of a crankshaft (27) housed in bearings formed in the compressor casing (2).