# US 9,752,708 B2 · Method for manufacturing an exhaust system and exhaust system

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- Number: US 9,752,708 B2
- Document ID: US9752708B2
- Status: Granted
- Kind: B2
- Application number: 14/130,745
- Filed: 2012-06-22
- Published: 2014-07-17
- Granted: 2017-09-05
- Earliest claimed: 2011-07-06
- Assignees: Faurecia Emissions Control Technologies, Germany GmbH
- Applicants: Alfred Blueml
- Inventors: Alfred Blueml
- Web page: https://patentgrep.com/patent/US9752708B2

## CPC

- F16L 13/08: Soldered joints
- F01N 13/18: Construction facilitating manufacture, assembly, or disassembly
- F01N 13/1838: {characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles}
- F16L 21/08: with additional locking means (F16L21/06 takes precedence; couplings of the quick-acting type F16L37/00)
- F01N 2450/22: by welding or brazing
- Y10T 29/49398: Muffler, manifold or exhaust pipe making
- Y10T 29/49968: Metal fusion joining
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An exhaust system is manufactured in the following manner. Initially, a plurality of pipe sections are put into each other with a clearance fit, so that connecting points are formed, at which two pipe sections overlap each other. The pipe sections then are calibrated at the connecting points, so that a narrow gap is obtained. Subsequently, the connecting points are soldered. The exhaust system thus includes a plurality of pipe sections which are put into each other and soldered to each other. Outer pipe sections of the plurality of pipe sections are calibrated.

## Claims

### Claim 1

A method for manufacturing an exhaust system including a plurality of pipe sections, comprising the following steps:
selecting more than ten different pipe sections from a given construction set of pre-produced pipe sections as the plurality of pipe sections;
putting the entire exhaust system together by putting each of the plurality of pipe sections into another respective pipe section with a clearance fit, so that connecting points are formed at which two pipe sections overlap each other;
calibrating the pipe sections at all connecting points at the same time by applying a pressure onto an outer pipe of the two pipe sections in a radial inward direction so that at least the outer pipe of each connecting point is deformed plastically and a narrow gap is obtained between the overlapping pipes; and
soldering all of the connecting points of the entire exhaust system at the same time.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the exhaust system is soldered in a horizontal orientation.

### Claim 3 (depends on 1)

The method according to claim 1, wherein before putting the pipe sections together, a solder material has been applied at one end of a pipe section.

### Claim 4 (depends on 1)

The method according to claim 1, including associating a holding device with each connecting point, wherein the holding device suitably fixes the pipe sections.

### Claim 5 (depends on 4)

The method according to claim 4, including using pressing jaws associated with the holding device to apply the pressure in a radially inward direction about the outer circumference of the outer pipe of the two pipe sections.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the pressing jaws are integrated into the holding device.

### Claim 7 (depends on 5)

The method according to claim 5, including arranging solder material in a region of each connecting point, and simultaneously heating each connecting point such that the solder material melts and after cooling reliably connects the two pipe sections with each other.

### Claim 8 (depends on 7)

The method according to claim 7, including using an induction device to heat the solder, wherein the induction device is integrated into the holding device.

### Claim 9 (depends on 7)

The method according to claim 7, including using an induction device to heat the solder, wherein the induction device and pressing jaws are integrated into the holding device.