Abstract: The cooling and lubricating system is provided for a piston sealing device for a piston, which includes a fixed skirt and a sliding skirt joined together by an interskirt mechanical connection to axially compress a continuous extensible segment under the action of a sliding skirt spring. The system adds to the device a sliding skirt thrust ring so as to insert between the fixed skirt and the continuous extensible segment a flow valve traversed by the interskirt mechanical connection. The valve is held at rest away from the fixed skirt by a valve return spring on the one hand, and including a flow calibration orifice on the other hand.

Abstract: The cooling and lubricating (1) system is provided for a piston sealing device (2) for a piston (3) which comprises a fixed skirt (7) and a sliding skirt (12) joined together by an interskirt mechanical connection (13) to axially compress a continuous extensible segment (15) under the action of a sliding skirt spring (20), said system (1) adding to said device (2) a sliding skirt thrust ring (21) so as to insert between the fixed skirt (7) and the continuous extensible segment (15) a flow valve (22) traversed by the interskirt mechanical connection (13), said valve (22) being held at rest away from the fixed skirt (7) by a valve return spring (30) on the one hand, and comprising a flow calibration orifice (27) on the other hand.

Abstract: A system (300) for coupling a piston for a hydraulic pump motor is provided for a hydraulic pump motor which includes a central rotor (3) of a pump motor which houses a hydraulic cylinder (14) inside of which a hydraulic piston (13) moves in translation and can push a tappet (18) guided by a hydraulic piston guided in translation by a tappet guide (19), the system (300) including a connection shaft (301) integral by a first end of the tappet (18) guided by a hydraulic piston and traversing the hydraulic piston (13) in the direction of its length via an orifice (307) of the connection shaft whereas a retention spring (304) is supported on the connection shaft (301) in the vicinity of a second end for maintaining this piston (13) in contact with the tappet (18) guided by the hydraulic piston.

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).