A flywheel arrangement comprising a shaft with a flywheel fixedly connected thereto. The flywheel comprises at least one cavity and that cavity is at least partially filled with particulate matter.

A lubricant supply system for a squeeze film damper. The lubricant supply system includes a fluid passage configured to supply a lubricant to the squeeze film damper of a bearing assembly. The fluid passage includes a first flow path for lubricant into the lubricant supply system and into the squeeze film damper of the bearing assembly and a second flow path for lubricant into the squeeze film damper of the bearing assembly. The lubricant supply system includes a valve assembly configured to allow the fluid passage to move from the first flow path to the second flow path in response to an interruption of the first flow path.

An aircraft tail skid energy absorption indicator including a crushable indicator cartridge disposed within the an outer shock absorber canister of the aircraft tail skid, and an indicator rod coupled to the crushable indicator cartridge so as to move with a portion of the crushable indicator cartridge as a unit, where the indicator rod extends through an aperture in a wall of the outer shock absorber canister, where the indicator rod includes at least one graduation that indicates an amount of remaining energy absorption of the aircraft tail skid energy absorption indicator.

Described is a gas spring (200), comprising a guide (2), having an outer surface (212), a slider (1), defining with said guide (2) at least one chamber (11) containing pressurised gas, said slider (1) being slidably connected to said guide (2) in such a way as to have a maximum stroke, of expansion, wherein said guide (2) is partially extracted from said slider (1), and a maximum stroke, of compression, characterised in that it comprises a bushing (3), positioned between said slider (1) and said guide (2), comprising sealing means for the tightness of the chamber (11), and removably coupled and so as to move integrally with said slider (1) up to said maximum stroke, in such a way that, when said slider (1) slides with respect to said guide (2) beyond said maximum stroke, said bushing (3) decouples from said slider (1) so as to eliminate the seal of the chamber (11).

A stop buffer for absorbing kinetic energy in a collision between two objects, includes a first spring body made of an elastic material. The first spring body is connected to a carrier body, and includes at least one electrical sensor, which has a triggering element that can be mechanically actuated. The sensor outputs a signal when the triggering element is actuated. The sensor is arranged relative to the carrier body in such a way that the triggering element is actuated by a detachment of the first spring body from the carrier body, or an actuation mechanism is provided, by which the triggering element of the sensor is actuated by a force acting on the carrier body in a collision when the force exceeds a predefined magnitude that indicates a failure of the first spring body because of wear or, if the first spring body is intact, indicates excessive collision energy.

A gas cylinder actuator with safety device for uncontrolled return of the piston-stem, comprising: a tubular containment jacket, two opposing heads for closing the tubular jacket, a first head which is provided with a through hole for passage and for translation guidance with respect to an axis of symmetry for a piston-stem, and a second, opposing head, a piston-stem, which comprises a stem portion and a piston portion, sealing elements which are arranged so as to act against the stem portion at the passage and guidance hole, a chamber for pressurized gas being defined between the tubular jacket, the heads and the piston-stem; such gas cylinder actuator comprises, between the first head and the piston portion, a bushing, which is coupled to the tubular jacket with elements of preventing translation with respect to the axis, and is designed to encounter the piston portion, the bushing being configured to at least be deformed in the event of impact with the piston portion owing to the uncontrolled return of the piston-stem, so as to allow the passage of the piston portion and the formation of a gas discharge passage between the piston-stem, the sealing elements and the passage and guidance hole.

Technologies are generally described for lead-lag dampers. An example lead-lag may include a single- or two-stage floating annular ring, elastomer bearings, a tension stop, a compression stop, and a plunger/spring volume compensator. The floating annular ring(s) form orifice(s) in conjunction with the remaining damper components may provide stable performance by tracking with any center shaft misalignment during operation. The lead-lag damper may also include a secondary spring system allowing or disallowing fluid flow between chambers based on slow or sudden movement of the shaft.

A suspension device includes: a hydraulic damper including a rod provided with a valve for generating a hydraulic pressure when the rod is displaced between a first liquid chamber and a second liquid chamber; an electric damper configured to electrically displace the rod by an actuator; and a communication passage that establishes communication between the first liquid chamber and the second liquid chamber while bypassing the valve during operation of the electric damper.

A piston cylinder device (1) comprising a cylinder (2) with a first and a second end and a guide (6), such that a pressure chamber (8) is formed in the cylinder. A piston (12) is moveable in the pressure chamber (8). The guide (6) is fixedly secured to the cylinder (2) by a lock ring (7). A sealing means (9) is arranged to seal between the guide (6) and an inner wall of a tubular wall (3) of the cylinder (2) to prevent fluid leakage from the pressure chamber (8) to the surroundings. The piston cylinder device (1) is provided with a material weakening zone (13) arranged in the inner wall of the tubular wall (3) of the cylinder (2) axially between the lock ring (7) and the second end (20) of the cylinder (2), the material weakening zone (13) being arranged to be deformed or sheared against the lock ring (7) at a predetermined level of impact of the piston (12) against the guide (6). A leakage gap (14) is arranged to interrupt the sealing means (9) upon deformation or shearing of the material weakening zone (13) such that gas from the pressure chamber (8) is allowed to leave the pressure chamber (8) through said leakage gap (14) to the surroundings.

An aircraft tail skid energy absorption indicator including a crushable indicator cartridge disposed within the an outer shock absorber canister of the aircraft tail skid, and an indicator rod coupled to the crushable indicator cartridge so as to move with a portion of the crushable indicator cartridge as a unit, where the indicator rod extends through an aperture in a wall of the outer shock absorber canister, where the indicator rod includes at least one graduation that indicates an amount of remaining energy absorption of the aircraft tail skid energy absorption indicator.