Process for manufacturing an air gap-insulated exhaust pipe

Details Process for manufacturing an air gap-insulated exhaust pipe Process for manufacturing an air gap-insulated exhaust pipe

1996-07-30

1998-09-01

Cuda, Irene

Metal working

Method of mechanical manufacture

Muffler, manifold or exhaust pipe making

29890036, 29890053, B23P 1500

Patent

active

057993955

ABSTRACT:
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.

REFERENCES:
patent: 3500954 (1970-03-01), Willette
patent: 4356885 (1982-11-01), Dello
patent: 4501302 (1985-02-01), Harwood
patent: 4590652 (1986-05-01), Harwood
patent: 4656713 (1987-04-01), Rosa et al.
patent: 5100047 (1992-03-01), Nakagawa et al.
patent: 5170557 (1992-12-01), Rigsby
patent: 5186502 (1993-02-01), Martin
patent: 5390494 (1995-02-01), Clegg
patent: 5673470 (1997-10-01), Dehlinger et al.

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