Abstract: A shock-absorber has an outer cylindrical tube, an inner cylindrical tube, a rod, a main piston and a hydraulic stop member received in a compression chamber and operating during an end section of the compression stroke of the shock-absorber to cause an increase in the hydraulic damping force. The hydraulic stop member has a cup-shaped body mounted in the compression chamber and a first auxiliary piston which is mounted on a cylindrical body rigidly connected to the main piston and is configured to sealingly slide in the cup-shaped body during an end section of the compression stroke, encompassing a working chamber with the cup-shaped body. A sliding member is slidably received inside the cylindrical body for opening or closing at least one first passage of the cylindrical body through which oil flows from the working chamber of the cup-shaped body to the compression chamber of the shock-absorber.

Abstract: A rotary damper includes a rotating input member rotating about a rotation axis; a first cylinder and a second cylinder coaxially arranged on opposite sides of the rotation axis; a first and a second pistons slidable inside the first and second cylinders and defining a first and a second working chambers containing incompressible working fluids, respectively; motion conversion mechanisms converting the rotary motion of the rotating input member about the rotation axis into reciprocating motion of the first and second pistons; a third cylinder; a fourth cylinder; and a third and fourth pistons, slidable inside the third and fourth cylinders, respectively and separating the inner volume of the respective cylinder into a respective main chamber in fluid communication with the first working chamber and auxiliary chambers; and the second working chamber and auxiliary chambers respectively.

Abstract: A shock-absorber has an outer cylindrical tube, an inner cylindrical tube, a rod, a main piston and a hydraulic stop member received in a compression chamber and operating during an end section of the compression stroke of the shock-absorber to cause an increase in the hydraulic damping force. The hydraulic stop member has a cup-shaped body mounted in the compression chamber and a first auxiliary piston which is mounted on a cylindrical body rigidly connected to the main piston and is configured to sealingly slide in the cup-shaped body during an end section of the compression stroke, encompassing a working chamber with the cup-shaped body. A sliding member is slidably received inside the cylindrical body for opening or closing at least one first passage of the cylindrical body through which oil flows from the working chamber of the cup-shaped body to the compression chamber of the shock-absorber.

Abstract: A rotary damper includes a rotating input member rotating about a rotation axis; a first cylinder and a second cylinder coaxially arranged on opposite sides of the rotation axis; a first and a second pistons slidable inside the first and second cylinders and defining a first and a second working chambers containing incompressible working fluids, respectively; motion conversion mechanisms converting the rotary motion of the rotating input member about the rotation axis into reciprocating motion of the first and second pistons; a third cylinder; a fourth cylinder; and a third and fourth pistons, slidable inside the third and fourth cylinders, respectively and separating the inner volume of the respective cylinder into a respective main chamber in fluid communication with the first working chamber and auxiliary chambers; and the second working chamber and auxiliary chambers respectively.

Abstract: Gliding board with a damping device for the vertical movements of the front or rear zone of the board said system including an arm whose first end is integral with an attaching point located in the front or rear zone of the board and whose second end is integral with the piston of a hydraulic device connected to the board near the attachment, said hydraulic device applying a retaining force during the movement of the second end of the arm in order to dissipate part of the kinetic energy from the front or rear zone of the board transmitted by said arm, wherein when the movement of the arm is consecutive to the movement of the attaching point downwards, the hydraulic device applies a retaining force which is less than the force applied when the movement of the arm is consecutive to a movement of the attaching point upwards.

Abstract: Gliding board with a damping device for the vertical movements of the front or rear zone of the board said system including an arm whose first end is integral with an attaching point located in the front or rear zone of the board and whose second end is integral with the piston of a hydraulic device connected to the board near the attachment, said hydraulic device applying a retaining force during the movement of the second end of the arm in order to dissipate part of the kinetic energy from the front or rear zone of the board transmitted by said arm, wherein when the movement of the arm is consecutive to the movement of the attaching point downwards, the hydraulic device applies a retaining force which is less than the force applied when the movement of the arm is consecutive to a movement of the attaching point upwards.

Abstract: Damper device for damping relative movements of two elements of a mechanical system. The damper device comprises a damping chamber filled with a hydraulic fluid, a rod (4) having a piston (3) movable in the damping chamber so as to define two hydraulic compartments (1, 2), at least one calibrated orifice (10) provided in the piston (3) for throttling the hydraulic fluid flowing from one hydraulic compartment (1, 2) to another hydraulic compartment, at least one compression peak-limiting valve (11) and a traction peak-limiting valve (12), throttling the hydraulic fluid flowing from one hydraulic compartment (1, 2) to another hydraulic compartment. The damper has additional hydraulic means that are active in compression and in traction when the piston (3) reaches the end of its stroke, so as to constitute a progressive hydraulic abutment damping the end-of-stroke jolts.

Abstract: Damper device for damping relative movements of two elements of a mechanical system. The damper device comprises a damping chamber filled with a hydraulic fluid, a rod (4) having a piston (3) movable in the damping chamber so as to define two hydraulic compartments (1, 2), at least one calibrated orifice (10) provided in the piston (3) for throttling the hydraulic fluid flowing from one hydraulic compartment (1, 2) to another hydraulic compartment, at least one compression peak-limiting valve (11) and a traction peak-limiting valve (12), throttling the hydraulic fluid flowing from one hydraulic compartment (1, 2) to another hydraulic compartment. The damper has additional hydraulic means that are active in compression and in traction when the piston (3) reaches the end of its stroke, so as to constitute a progressive hydraulic abutment damping the end-of-stroke jolts.

Abstract: A damper (1) is provided with a body (2) which surrounds an annular compression chamber (3), the damper (1) being furnished with at least one pneumatic compensation chamber (30, 40) and a control piston (4) that can move relative to the body (2), the control piston (4) having a rod (5) which protrudes from the body (2) and a head (6) which slides in the compression chamber (3). The damper is notable in that, the compression chamber (3) comprising a variable-section radial opening (8), the damper (1) is provided with a hydraulic compensation chamber (10) which receives a first fluid expelled from the annular compression chamber (3) via the variable-section radial opening (8) when the control piston (4) moves.

Abstract: A retraction cylinder (20) makes it possible to retract a leg (10) of a rotorcraft landing gear, the retraction cylinder (20) comprising a retraction chamber (33) and an extension chamber (34) separated by a head (26) of a piston (25), the piston (25) sliding in a cylindrical sheath (35). In addition, the retraction cylinder (20) comprises a return element (23) and a control chamber (22) furnished with a first fluid, this control chamber (22) being separated from the return element (23) by a movable release member (24), the movable release member (24) sliding so that the retraction cylinder (20) fulfils a damping function when a control pressure exerted by the first fluid on the movable release member (24) is greater than a return pressure exerted by the return element (23).

Abstract: A retraction cylinder (20) makes it possible to retract a leg (10) of a rotorcraft landing gear, the retraction cylinder (20) comprising a retraction chamber (33) and an extension chamber (34) separated by a head (26) of a piston (25), the piston (25) sliding in a cylindrical sheath (35). In addition, the retraction cylinder (20) comprises a return element (23) and a control chamber (22) furnished with a first fluid, this control chamber (22) being separated from the return element (23) by a movable release member (24), the movable release member (24) sliding so that the retraction cylinder (20) fulfils a damping function when a control pressure exerted by the first fluid on the movable release member (24) is greater than a return pressure exerted by the return element (23).

Abstract: A damper (1) is provided with a body (2) which surrounds an annular compression chamber (3), the damper (1) being furnished with at least one pneumatic compensation chamber (30, 40) and a control piston (4) that can move relative to the body (2), the control piston (4) having a rod (5) which protrudes from the body (2) and a head (6) which slides in the compression chamber (3). The damper is notable in that, the compression chamber (3) comprising a variable-section radial opening (8), the damper (1) is provided with a hydraulic compensation chamber (10) which receives a first fluid expelled from the annular compression chamber (3) via the variable-section radial opening (8) when the control piston (4) moves.