Aircraft undercarriage including a telescopic linear rod

An aircraft undercarriage including a telescopic linear rod (0, 0′, 0″) extending between a first rod end (30, 30′, 30″) having means for attaching the rod to a main structure of the aircraft and a second rod end (31, 31′, 31″) carrying a wheel axle (5, 5′) of the undercarriage, the telescopic linear rod (0, 0′, 0″) comprising rod portions (1, 2, 3, 4, 1′, 2′, 3′, 4′, 1″, 2″, 3″, 4″) adapted to slide in one another along a main axis of symmetry (X-X, X′-X′, X″-X″) of the rod in order to extend or retract the telescopic rod, the undercarriage being characterized in that it further comprises:

• a first permanent magnet set (1a, 1a′, 1a″) fastened to a first of said rod portions (1, 1′, 1″);
• and
• a second permanent magnet set (2a, 2a′, 2a″) fastened to a second of said rod portions (2, 2′, 2″);
• the first and second permanent magnet sets (1a, 1a′, 1a″, 2a, 2a′, 2a″) being arranged so as to generate a magnetic repulsion force between the first rod portion (1, 1′, 1″) and the second rod portion (2, 2′, 2″) and in such a manner as to maintain a first annular space (E1) extending around one of the first or second rod portions and situated between the first rod portion and the second rod portion;
• at least some of the magnets of the first permanent magnet set (1a, 1a′, 1a″) are :
• arranged facing at least some of the magnets of the second permanent magnet set (2a, 2a′, 2a″) so as to generate magnetic torque opposing relative pivoting about the main axis of symmetry (X-X, X′-X′, X″-X″) of the first rod portion (1, 1′, 1″) relative to the second rod portion (2, 2′, 2″);
• and
• form branches of a star extending around the main axis of symmetry (X-X, X′-X′, X″-X″);
• and wherein
• at least some of the magnets of the second permanent magnet set (2a, 2a′, 2a″) are arranged between some of the branches of the star to generate magnetic repulsion forces against the magnets of the first permanent magnet set forming the branches of the star.