INTERNAL COMBUSTION ENGINE EXHAUST DEVICE AND METHOD FOR MAKING SAME

• US 20010025419A1
• Filed: 11/30/1999
• Published: 10/04/2001
• Est. Priority Date: 04/10/1997
• Status: Active Grant

• Current Assignee: Renault
• Original Assignee: Renault
• Inventors: MARKIEWSKI, PATRICK FRANCOIS, PIERDET, ALAIN, CELERIER, DANIEL
• Granted Patent: US 6,848,438 B2
• Time in Patent Office: Days
• US Class Current: 29/890.08
• CPC Class Codes: B21C 37/298 Forming collars by flow-drilling flow drilling B21J5/066
• CPC Class Codes: B21J 5/066 Flow drilling
• CPC Class Codes: F01N 13/008 Mounting or arrangement of exhaust sensors in or on exhaust apparatus sensor arrangements for engine control F02D41/1439
• CPC Class Codes: F01N 2530/04 Steel alloys, e.g. stainless steel
• CPC Class Codes: Y10T 29/49398 Muffler, manifold or exhaust pipe making

Abstract

The invention concerns an internal engine exhaust device comprising a conduit element (1) through which the exhaust gases flow out, said conduit element (1) including a housing (2) for mounting a measurement sensor such as an oxygen probe, characterised in that said housing (2) is formed by a hole extended by an insert produced directly through said conduit element (1).

Claims

1. An exhaust device for internal combustion engines having a pipe element (1) inside which there flow the exhaust gases, the said pipe element (1) having a housing (2) in which a measuring transducer such as an oxygen sensor can be mounted, characterized in that the said housing (2) is formed by a hole prolonged by a bush (3) made directly through the wall of the said pipe element (1), the said housing (2) being obtained from a first flow-drilling operation followed by a second operation of thread tapping by deformation, the said flow-drilling operation comprising drilling through the wall with a tool, a speed and a penetration force adapted to cause melting and upsetting of the material around the tool in proportion to the advance of this tool, until a bush of required height and diameter is obtained.

2. An exhaust device for internal combustion engines according to

claim 1

, characterized in that the said pipe element (1) is provided with a wall of substantially uniform thickness of between 1 and 3 mm.

3. An exhaust device for internal combustion engines according to any one of

claims 1

to

2

, characterized in that the said pipe element (1) is provided with a wall made of stainless metal alloy.

4. A process for making an exhaust device according to any one of

claims 1

to

3

, characterized in that the said tool comprises an ogival mandrel.