Viscous torsional-vibration damper and method for producing a viscous torsional-vibration damper

A viscous torsional-vibration damper, comprising:

• a damper housing having an axis of rotation and an annular working chamber filled with a damping medium;
• an inertia ring arranged inside the working chamber;
• and
• a cover for medium-tight closure of the working chamber, wherein
• the cover is connected to the damper housing circumferentially at least on one side by a sequence of a butt seam and a lap seam, and
• the lap seam is arranged offset in a radial direction by 1-7 mm relative to the butt seam, wherein
• the viscous torsional-vibration damper has a first wall with an inner lateral surface and a second wall with an outer lateral surface,
• the working chamber is arranged between the inner and outer lateral surfaces and thereby also between the first and second walls, and
• the sequence of a lap seam and a butt seam is arranged in a radially outer edge region of the cover, wherein both weld seams connect the cover to the first wall comprising the outer lateral surface.

A method for producing a viscous torsional-vibration damper, the method comprising:

• a) providing a damper body comprising an annular working chamber for receiving an inertia ring via a chamber opening;
• b) inserting the inertia ring into the working chamber of the damping body;
• c) closing the working chamber of the damping body with a cover by at least one medium-tight circumferential welded joint;
• and
• d) filling the working chamber with a damping medium, wherein
• the welded joint is, at least in an edge region of the cover, carried out by a sequence of a butt seam and a lap seam, and
• the lap seam is arranged offset in a radial direction by 1-7 mm relative to the butt seam,
• the viscous torsional-vibration damper has a first wall with an inner lateral surface and a second wall with an outer lateral surface,
• the working chamber is arranged between the inner and outer lateral surfaces and thereby also between the first and second walls, and
• the sequence of a lap seam and a butt seam is arranged in a radially inner edge region of the cover, wherein both weld seams connect the cover to the first wall comprising the inner lateral surface.