Patent ID: 8869958

Claim:
A hydraulic rotation damper intended for use on a vehicle, the rotation damper comprising an outer housing and a lid, the outer housing and the lid enclosing a damping-medium-filled main chamber that is pressurized by a pressure tank and that is divided by a delimiting blade/arm into two volumes, in which the damping medium flows between the two volumes in a damping medium duct delimited by at least a first valve and a second valve, the first valve and the second valve throttle the flow between the volumes when the blade moves in an inward motion and an outward motion to or from an intermediate position, in which the two volumes are substantially equal in size, from or to an outer position, in which the blade bears against or is placed close to an inner face of the outer housing, the first valve controlling the flow for outward motions and the second valve controlling the flow for inward motions to either pass through the first valve, through the second valve or through both valves, the second valve being connected to the main chamber via a first duct such that, when the second valve is partially open, the damping medium flows between the volumes through the first valve during outward motions, and during inward motion the damping medium flows only through the second valve or through both valves, the first duct emerging in an inner volume of the outer housing at a position that coincides with the intermediate position of the blade.