Rotation damper with constant friction coefficient

A rotation damper comprising:

• a cylindrical hollow first piston having an inner side, an outer side, and an extension which extends away from a head of the first piston in an axial direction of the first piston;
• a first housing having a cylindrical interior which surrounds a wall of the first piston, so that a first annular gap is formed between a portion of a first inner side of the first housing and the outer side of the first piston, and a second annular gap is formed between the inner side of the first piston and a second inner side of the first housing,
• wherein the extension of the first piston projects from a first opening which lies opposite a second opening of the first housing;
• a first seal between the inner side of the first piston and the second inner side of the first housing;
• a second seal between the outer side of the first piston and the first inner side of the first housing,
• wherein the first annular gap, the second annular gap, and a cavity between the first and the second annular gap are configured to be filled with a viscous liquid;
• and
• a cylindrical second housing, which has a fixed distance from the first housing, wherein the extension projects into the second housing and ends at a cylindrical second piston,
• wherein a first chamber, which faces away from the extension, is configured to be filled with a material having a volume that expands with increasing temperature,
• wherein, in a second chamber of the second housing, a spring is located between the second piston and an inner wall of the second housing in an axial direction of the second piston, and
• wherein the rotation damper is configured so that the second piston, with decreasing temperature, pulls the extension out of the first housing, and with increasing temperature, pushes the extension into the first housing.