Shock absorber (2; 102) for motor vehicle suspension, comprising: - a first element (4; 104) intended to be fixed to one of a movable part of the suspension and a fixed part of the vehicle; And - a second element (6; 106) positioned concentrically around the first element (4; 104), capable of sliding axially relative to the first element (4; 104), and intended to be fixed to the other of the movable part of the suspension and the fixed part of the vehicle; the first and second elements (4, 6; 104, 106) forming a damping hydraulic circuit and an inertial hydraulic circuit, characterized in that the first element (4; 104) is a cylinder (8; 108) forming a cylindrical chamber (10; 110) and the second element (6; 106) comprises an internal piston (14; 114) slidably mounted in the cylindrical chamber (10; 110) and a rod (16; 116) linked to said inner piston , said cylindrical chamber and said inner piston corresponding to one of the damper hydraulic circuits (10, 14; 110, 114) and inertial (12, 22; 112, 122, 125), and an external cylinder (18; 118) linked to the rod (16; 116) and concentrically surrounding the first element (4; 104) so as to slide along the outer wall of said first element (4; 104) and to form with the first element (4; 104) an outer chamber (22; 125), and where the first element (4; 104) ) comprises an outer annular portion forming at least one annular piston (12; 112), the shock absorber comprising a cylindrical wall (20; 120) concentrically surrounding a part of the first element (4; 104) to form an annular chamber (22; 122), the at least one piston (12; 112) sliding along said cylindrical wall (20; 120) in the annular chamber (22; 122), characterized in that the cylindrical wall (20; 120) comprises a helical groove (24; 124) forming, opposite the at least one piston (12; 122), at least one passage for the hydraulic fluid during sliding of the minus one piston (12; 112) along the cylindrical wall (20; 120). - a first element (4; 104) intended to be fixed to one of a movable part of the suspension and a fixed part of the vehicle; And - a second element (6; 106) positioned concentrically around the first element (4; 104), capable of sliding axially relative to the first element (4; 104), and intended to be fixed to the other of the movable part of the suspension and the fixed part of the vehicle; the first and second elements (4, 6; 104, 106) forming a damping hydraulic circuit and an inertial hydraulic circuit, characterized in that the first element (4; 104) is a cylinder (8; 108) forming a cylindrical chamber (10; 110) and the second element (6; 106) comprises an internal piston (14; 114) slidably mounted in the cylindrical chamber (10; 110) and a rod (16; 116) linked to said inner piston , said cylindrical chamber and said inner piston corresponding to one of the damper hydraulic circuits (10, 14; 110, 114) and inertial (12, 22; 112, 122, 125), and an external cylinder (18; 118) linked to the rod (16; 116) and concentrically surrounding the first element (4; 104) so as to slide along the outer wall of said first element (4; 104) and to form with the first element (4; 104) an outer chamber (22; 125), and where the first element (4; 104) ) comprises an outer annular portion forming at least one annular piston (12; 112), the shock absorber comprising a cylindrical wall (20; 120) concentrically surrounding a part of the first element (4; 104) to form an annular chamber (22; 122), the at least one piston (12; 112) sliding along said cylindrical wall (20; 120) in the annular chamber (22; 122), characterized in that the cylindrical wall (20; 120) comprises a helical groove (24; 124) forming, opposite the at least one piston (12; 122), at least one passage for the hydraulic fluid during sliding of the minus one piston (12; 112) along the cylindrical wall (20; 120). <EOS>