J. Eberspächer Gmbh & Co.

Alfred Utter

Thomas Nording

Air gap-insulated exhaust pipe (2) with a sliding fit (16) between two inner pipe sections (12, 14) in a middle area of the length of the exhaust pipe (2). A radial mounting (26) of the inner pipe (6) in the outer pipe (4) is provided in the area of a bend (20) or beyond the bend (20), which joins the leg (18) of the exhaust pipe (2) in which the sliding fit (16) is located. In terms of manufacturing technique, the radial mounting (26) may be prepared before or after the bending of the double-pipe arrangement. The sliding fit (16) may be prepared, even in the case of a straight exhaust pipe, manifold, or the like, by using a spacer sleeve (40) and joint calibration of the pipe ends of the inner pipe sections (12, 14), and the spacer sleeve burns off at the time the exhaust pipe is put into operation for the first time. As an alternative, the sliding fit (16) may also be prepared by polygon calibration and rotating the pipe ends by half the pitch of the polygon.

Air gap-insulated exhaust pipe and process for manufacturing same

An air gap-insulated exhaust pipe with a sliding fit between two inner pipe sections in a middle area of the length of the exhaust pipe has a radial mounting of the inner pipe in the outer pipe which is provided in the area of a bend or beyond the bend, which joins the leg of the exhaust pipe in which the sliding fit is located. In terms of manufacturing technique, the radial mounting may be prepared before or after the bending of the double-pipe arrangement. The sliding fit may be prepared, even in the case of a straight exhaust pipe, manifold, or the like, by using a spacer sleeve and joint calibration of the pipe ends of the inner pipe sections, and the spacer sleeve burns off at the time the exhaust pipe is put into operation for the first time. As an alternative, the sliding fit may also be prepared by polygon calibration and rotating the pipe ends by half the pitch of the polygon.

Growing community of inventors

Waldmohr, Germany

Alfred Utter