Built-up airgap-insulated exhaust manifold of a motor vehicle and method for producing it

US6427440B1 · kind B1 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Pierre Bonny · Hamburg, DE
• Thomas Hulsberg · Schwäbisch Hall, DE

Key dates

• Filing date: May 18, 2000
• Grant date: Aug 6, 2002
• Expiry date: May 18, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2260/10
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A built-up airgap-insulated exhaust manifold of an exhaust system of a motor vehicle includes at least two exhaust pipes with an inlet flange attached in each case to one end and to be fastened to the cylinder head of an internal combustion engine of a motor vehicle. The exhaust pipes include a pipe bend and at least one branched pipe piece connected to the latter. If a plurality of branched pipe pieces are arranged they are connected to one another in a row and the last pipe piece in the row forms a header connected at one end to the exhaust tract leading further on in the exhaust system. The exhaust manifold has at least one exhaust pipe, which is designed as a double pipe with airgap insulation between an outer and an inner pipe, and possessing at least one exhaust pipe without an air insulation gap. The outer pipe and the inner pipe of the airgap-insulated exhaust pipe bear against one another at the end which is plugged together with and welded to an associated inlet flange.