A landing gear actuation system is disclosed herein. The landing gear actuation system includes an attachment point integral to a movable member, a flexible pull member having a first end coupled to the attachment point, and a motor configured to move the flexible pull member, wherein the movement of the flexible pull member moves the attachment point and the movable member.

Methods of moving an aircraft undercarriage that is movable between a retracted position and a deployed position generally include: using a rotary electromechanical type drive actuator coupled to a portion of the aircraft undercarriage to raise it from the deployed position to the retracted position; disengaging the drive actuator during a descent of the undercarriage from the retracted position to the deployed position and using a hydraulic linear shock absorber coupled to a portion of the undercarriage to regulate the rate of descent and to absorb shock on arrival of the undercarriage in the deployed position; and neutralizing the shock absorber while raising the undercarriage.

Methods of moving an aircraft undercarriage that is movable between a retracted position and a deployed position generally include: using a rotary electromechanical type drive actuator coupled to a portion of the aircraft undercarriage to raise it from the deployed position to the retracted position; disengaging the drive actuator during a descent of the undercarriage from the retracted position to the deployed position and using a hydraulic linear shock absorber coupled to a portion of the undercarriage to regulate the rate of descent and to absorb shock on arrival of the undercarriage in the deployed position; and neutralizing the shock absorber while raising the undercarriage.

A flying robot includes a body portion, a propulsion portion including a plurality of propulsion units configured to generate propulsion force by driving rotor blades, the plurality of propulsion units being provided at the body portion, a plurality of leg portions configured to support the body portion, each leg portion of the plurality of leg portions including at least one joint and being configured to be able to change a posture of the leg portion, and a controller configured to control the plurality of leg portions when landing on a landing surface from a flying state, and the controller controls part or all of at least one leg portion among the plurality of leg portions to adjust a tilt of the body portion from when the at least one leg portion comes into contact with the landing surface until when landing on the landing surface is completed.

A landing gear for a flight vehicle is used during landing. The landing gear for a flight vehicle includes a first cylinder structure configured to have an upper end which is coupled to be able to roll with respect to the flight vehicle; and a second cylinder structure configured to have a lower end which is able to come into contact with the ground, configured to be able to relatively move in an axial direction along a reference axis with respect to the first cylinder structure, and configured to be able to relatively rotate about the reference axis with respect to the first cylinder structure. The first cylinder structure and the second cylinder structure switch the landing gear between a stowed state and a released state by means of the relative movement and the relative rotation.

A landing gear for a flight vehicle is used during landing. The landing gear for a flight vehicle includes a first cylinder structure configured to have an upper end which is coupled to be able to roll with respect to the flight vehicle; and a second cylinder structure configured to have a lower end which is able to come into contact with the ground, configured to be able to relatively move in an axial direction along a reference axis with respect to the first cylinder structure, and configured to be able to relatively rotate about the reference axis with respect to the first cylinder structure. The first cylinder structure and the second cylinder structure switch the landing gear between a stowed state and a released state by means of the relative movement and the relative rotation.

A levered landing gear including a first shock strut having and a second shock strut disposed concentrically with the first shock strut. The second shock strut includes a metering pin coupled to a mounting surface of a piston of the second shock strut, and an orifice plate that cooperates with the metering pin to meter an amount of fluid flow as the second shock strut is compressed. The metering pin includes flutes longitudinally arranged on the metering pin between first and second ends of the metering pin, the flutes having a varying depth so that a fluid flow through the flutes is greater at the second end than fluid flow through the flutes at the first end. A truck lever is coupled to both the first shock strut and the second shock strut such that the second shock strut pivots the truck lever relative to the first shock strut.

A levered landing gear including a first shock strut having and a second shock strut disposed concentrically with the first shock strut. The second shock strut includes a metering pin coupled to a mounting surface of a piston of the second shock strut, and an orifice plate that cooperates with the metering pin to meter an amount of fluid flow as the second shock strut is compressed. The metering pin includes flutes longitudinally arranged on the metering pin between first and second ends of the metering pin, the flutes having a varying depth so that a fluid flow through the flutes is greater at the second end than fluid flow through the flutes at the first end. A truck lever is coupled to both the first shock strut and the second shock strut such that the second shock strut pivots the truck lever relative to the first shock strut.

A leg mechanism includes an articulated leg system, a passive device and a cable. The articulated leg system has a leg portion. The passive device is coupled to the articulated leg system and is configured to apply a first force to a portion thereof. The cable is coupled to the articulated leg system and is configured to apply a second force, in opposition to the first force, to a portion thereof. When the cable is drawn away from the articulated leg system, the second force moves the leg portion in a first direction. When tension is released from the cable, the passive device exerts the first force so as to move the leg portion a second direction that is opposite the first direction.

A leg mechanism includes an articulated leg system, a passive device and a cable. The articulated leg system has a leg portion. The passive device is coupled to the articulated leg system and is configured to apply a first force to a portion thereof. The cable is coupled to the articulated leg system and is configured to apply a second force, in opposition to the first force, to a portion thereof. When the cable is drawn away from the articulated leg system, the second force moves the leg portion in a first direction. When tension is released from the cable, the passive device exerts the first force so as to move the leg portion a second direction that is opposite the first direction.