Rotary damper (15), comprising a casing (17), an intermediate element (31) mounted movably on the casing (17), a braking fluid provided between the casing (17) and the intermediate element (31) so as to brake the movement of the intermediate element (31) relative to the casing (17), a rotor (50) mounted on the intermediate element (31) rotatably about an axis of rotation (x), and a unidirectional coupling arranged between the intermediate element (31) and the rotor (50). The unidirectional coupling comprises at least one radial block (60) arranged between a radially outer surface (52) of the rotor (50) and a radially inner surface (34) of the intermediate element (31), and at least one actuating lobe (55) formed on the rotor (50) and projecting radially from the radially outer surface (52) thereof, the radial bock (60) comprising a wedge part (61) designed to be engaged by the actuating lobe (55) of the rotor (50) during rotation in the first direction of rotation (A) so as to push the radial block (60) in the centrifugal direction and lock it between the rotor (50) and the intermediate element (31).

The present disclosure relates to a drive device for a movable vehicle flap, including a flap part associated with the vehicle flap, a body part associated with a vehicle body, a first joint arrangement being arranged between the flap part and the body part, including a first knee lever and a second knee lever. The first knee lever and the second knee lever each have at least a first control arm and a second control arm. The drive device further include a second joint arrangement for opening and closing the vehicle flap in a normal operation, at least a first actuator for raising the vehicle flap to a pedestrian protection position. The first actuator has a first connection element and a second connection element. The first connection element of the first actuator is hingedly coupled to the first knee lever of the first joint arrangement. The second connection element of the first actuator is hingedly coupled to the second knee lever of the first joint arrangement. A drive device for a vehicle flap, which is reliable and compact, is provided according to the present disclosure by the first connection element of the first actuator being hingedly coupled to the second control arm of the first knee lever and by the second connection element of the first actuator being hingedly coupled to the first control arm of the second knee lever.

Rotary damper (15), comprising a casing (17), an intermediate element (31) mounted on the casing (17), a braking fluid provided between the casing (17) and the intermediate element (31) so as to brake the movement of the intermediate element (31) relative to the casing (17), a rotor (50) mounted on the intermediate element (31) rotably about an axis of rotation (x), and a unidirectional coupling arranged between the intermediate element (31) and the rotor (50). The unidirectional coupling comprises at least one radial block (60) arranged between a radially outer surface (52) of the rotor (50) and a radially inner surface (34) of the intermediate element (31), and at least one actuating lobe (55) formed on the rotor (50) and projecting radially from the radially outer surface (52) thereof, the radial bock (60) comprising a wedge part (61) designed to be engaged by the actuating lobe (55) of the rotor (50) during rotation in the first direction of rotation (A) so as to push the radial block (60) in the centrifugal direction and lock it between the rotor (50)