Abstract: The synchronized roller with freewheels includes a central body which exposes an outer cylindrical rolling surface provided to roll between two rolling tracks lined with a synchronizing unit, each end of the body presenting a smooth axis about which a synchronizing pinion is freely rotatable, the axis having a pinion axial stop unit which prevents the pinion from emerging from the pinion, while a roller axial guide bears on the central body and on the rolling tracks to keep the outer cylindrical rolling surface approximately centered on the tracks.

Abstract: A spark plug with shuttle electrode is provided for an internal combustion engine which includes a combustion chamber in which a main charge diluted with a neutral gas is ignited, the spark plug housing a lamination cavity in which a central electrode opens and in which a lamination injector is able to inject under pressure a pilot charge consisting of an easily flammable combustive-AF fuel mixture, the cavity being connected to the combustion chamber by a lamination duct, while a shuttle electrode is interposed between the central electrode and a ground electrode and can translate in the lamination duct.

Abstract: The heat engine with transfer-expansion and regeneration (1) includes a compressor (2) which compresses gases in a high-pressure regeneration line (6) of a regeneration heat exchanger (5) from which they emerge preheated via a high-pressure regenerator outlet line (9) which has a heat source (12) that superheats the gases, the latter being then transferred by an admission metering valve (24) operated by a metering valve actuator (25) into a transfer-expansion chamber (16) formed in particular by an expansion cylinder (13) and an expansion piston (15), the gases leaving the chamber (16) after having been expanded via an expanded gas exhaust line (26) and thanks to an exhaust valve (31) operated by an exhaust valve actuator (32) before being cooled down in a low-pressure regeneration line (7) of the regeneration heat exchanger (5).

Abstract: The travel end expansion valve (1) for a piston type pressure converter (2) whose master cylinder (3) and slave cylinder (4) define a master chamber (9) and a slave chamber (10), respectively, includes an expansion master cylinder (12) which communicates with the slave chamber (10) and in which there can move an expansion main master piston (14) which is mechanically connected by a lever type transmission (11) with progressive effect to an expansion slave pump piston (15) which can move in an expansion slave cylinder (13), the transmission (11) being provided in such a manner that, when the expansion main master piston (14) is at the top dead center, the expansion slave pump piston (15) is at the bottom dead center, and vice versa, while an expansion release actuator (30) can cause the transmission (11) to move.

Abstract: A hydraulic pump distributor sealing ring for a hydraulic distributor of a hydraulic pump, includes a continuous sealing ring housed in a ring groove formed in a pump stator whose inlet-delivery ports are each aligned with a distribution opening passing right through the ring in the direction of its thickness, this ring including a circumferential-contact boss which has a circumferential line of contact that can come into contact with a rotor-side low-pressure sealing surface, the ring also including a compression-decompression track, a ring sealing lip that provides sealing between the ring and the ring groove, and rotation-proofing elements.

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: 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 reversible hydraulic pressure converter (1) employing tubular valves includes a medium-pressure stage (44) consisting of a medium-pressure cylinder (2) and a double-acting medium-pressure piston (3) the position of which is sent to a control computer of the converter (19) by a piston position sensor (14), the cylinder (2) and the piston (3) forming two medium-pressure chambers (5) that can be placed in communication with a medium-pressure inlet-outlet circuit (15) by at least one tubular valve (12), the converter (1) also including two high-pressure cylinders (9) each cooperating with a high-pressure piston (8) of smaller diameter and defining two high-pressure chambers (11) that can be placed in communication with a high-pressure inlet-outlet circuit (16) by at least one tubular valve (12), each of the various tubular valves (12) cooperating with an independent valve actuator (13).

Abstract: The double-acting pressure reducing cylinder (1) includes a cylinder shaft (71) which cooperates with a double-acting pressure reducing piston (2) connected to transmission elements (3) housed in a transmission casing (8), while a hollow pillar (13) whose ends are articulated is traversed by a rod tunnel and bears against the casing (8) to support the shaft (71), a tie rod (17) likewise articulated traversing the tunnel to clamp the cylinder shaft (71) to the hollow pillar (13), while lower centering elements of the cylinder (20) and upper centering elements of the cylinder (21) integrated with the transmission casing (8) in particular via a centering frame (22) allow the cylinder shaft (71) to move freely in parallel with its longitudinal axis but not in the plane perpendicular to the axis.

Abstract: The double-acting piston (1) includes a lower half-piston (13) and an upper half-piston (14), the periphery of each the half-piston (13, 14) coming into radial stop with a radial traction disc (30) which is tightly held by a clamping screw (29) between the two half-pistons (13, 14) on the one hand, in its center, between a lower central clamping surface (19) and an upper central clamping surface (20) and, on the other hand, at its periphery, between a lower peripheral clamping surface (21) and an upper peripheral clamping surface (22), the clamping by the screw (29) of the disc (30) resulting in prestressing the lower piston cap (15) and the upper piston cap (16) that the lower half-piston (13) and the upper half-piston (14) respectively have.

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 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: The heat engine with transfer-expansion and regeneration (1) includes a compressor (2) which compresses gases in a high-pressure regeneration line (6) of a regeneration heat exchanger (5) from which they emerge preheated via a high-pressure regenerator outlet line (9) which has a heat source (12) that superheats the gases, the latter being then transferred by an admission metering valve (24) operated by a metering valve actuator (25) into a transfer-expansion chamber (16) formed in particular by an expansion cylinder (13) and an expansion piston (15), the gases leaving the chamber (16) after having been expanded via an expanded gas exhaust line (26) and thanks to an exhaust valve (31) operated by an exhaust valve actuator (32) before being cooled down in a low-pressure regeneration line (7) of the regeneration heat exchanger (5).

Abstract: The distributor phase shifter for a hydraulic pump motor (300) is provided for a hydraulic pump motor (1) which includes a pump motor housing (2) and a pump motor central rotor (3) to which an input-output distributor (43) presents an input-output angular collector of an internal conduit (44) and an input-output angular collector of an external conduit (89), which phase shifter includes a phase shift acting element (301) which is supported on the housing of the pump motor (2) in order to make the input-output distributor (43) rotate around its longitudinal axis and over a determined angular range.

Abstract: The fluid-cushion sealing device (100) for a piston (101) moving in a cylinder (102) and defining with the latter a chamber to be sealed (104) includes: a continuous perforated ring (105) through the radial thickness of which passes a calibrated opening (111) and which is sealingly accommodated in a ring groove (109) provided in the piston (101) so as to define, with the groove (109), a pressure distribution chamber (119) connected to a pressurized fluid source (112), while an axially blind counter-pressure recess (115) is provided recessed on an external cylindrical ring surface (107) which faces the cylinder (102) and which the continuous perforated ring (105) includes, the calibrated opening (111) leading into the recess (115).

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

Abstract: A high-pressure rotating sealing coupling with continuous expandable ring (1) including a male hydraulic connector (2) rotating in a female hydraulic connector (4), the connectors (2, 4) including an inner duct leading into a communication chamber (10), a non-expandable sealing ring (42) being mounted freely about the male hydraulic connector (2) and being accommodated with little play in the female hydraulic connector (4), while a non-expandable ring spring (20) tends to draw the sealing ring (42) close to a ring annular bearing shoulder (14) connected to the male hydraulic connector (2) and to axially compress a continuous expandable ring (13) inserted axially between the non-expandable sealing ring (42) and the ring annular bearing shoulder (14) and having an expandable ring inner cylindrical face (15) placed in communication with the communication chamber (10).

Abstract: The travel end expansion valve (1) for a piston type pressure converter (2) whose master cylinder (3) and slave cylinder (4) define a master chamber (9) and a slave chamber (10), respectively, includes an expansion master cylinder (12) which communicates with the slave chamber (10) and in which there can move an expansion main master piston (14) which is mechanically connected by a lever type transmission (11) with progressive effect to an expansion slave pump piston (15) which can move in an expansion slave cylinder (13), the transmission (11) being provided in such a manner that, when the expansion main master piston (14) is at the top dead center, the expansion slave pump piston (15) is at the bottom dead center, and vice versa, while an expansion release actuator (30) can cause the transmission (11) to move.

Abstract: Hydraulic pump distributor sealing ring (1) for a hydraulic distributor (2) of a hydraulic pump (44), includes a continuous sealing ring (11) housed in a ring groove (16) formed in a pump stator (3) whose inlet-delivery ports (7) are each aligned with a distribution opening (21) passing right through the ring (11) in the direction of its thickness, this ring including a circumferential-contact boss (14) which has a circumferential line of contact (15) that can come into contact with a rotor-side low-pressure sealing surface (13), the ring (11) also including a compression-decompression track (24), a ring sealing lip (39) that provides sealing between the ring (11) and the ring groove (16), and rotation-proofing elements (36).

Abstract: The reversible hydraulic pressure converter (1) employing tubular valves includes a medium-pressure stage (44) consisting of a medium-pressure cylinder (2) and a double-acting medium-pressure piston (3) the position of which is sent to a control computer of the converter (19) by a piston position sensor (14), the cylinder (2) and the piston (3) forming two medium-pressure chambers (5) that can be placed in communication with a medium-pressure inlet-outlet circuit (15) by at least one tubular valve (12), the converter (1) also including two high-pressure cylinders (9) each cooperating with a high-pressure piston (8) of smaller diameter and defining two high-pressure chambers (11) that can be placed in communication with a high-pressure inlet-outlet circuit (16) by at least one tubular valve (12), each of the various tubular valves (12) cooperating with an independent valve actuator (13).