Process for producing a metallic honeycomb body with a receptacle for a sensor

• US 20040074094A1
• Filed: 09/03/2003
• Published: 04/22/2004
• Est. Priority Date: 03/16/2001
• Status: Active Grant

• Current Assignee: Emitec Gesellschaft für Emissionstechnologie mbH (Continental AG)
• Original Assignee: Emitec Gesellschaft für Emissionstechnologie mbH (Continental AG)
• Inventors: Bruck, Rolf
• Granted Patent: US 7,111,393 B2
• Time in Patent Office: Days
• US Class Current: 29/890
• CPC Class Codes: B01J 35/56 Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
• CPC Class Codes: F01N 11/002 the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
• 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 2330/04 Methods of manufacturing
• CPC Class Codes: F01N 2550/02 Catalytic activity of catalytic converters
• CPC Class Codes: F01N 3/281 Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y10T 29/49345 Catalytic device making

Abstract

A metal honeycomb body that is particularly suited for use in an exhaust system of an internal combustion engine is prepped for receiving a sensor that reaches into the interior of the honeycomb body. First, voids such as recesses and/or elongated holes are formed in at least one sheet metal foil. Then some of the foils are at least partially structured, as for example corrugated. Then the foils are stacked, coiled, wound, or otherwise made into a honeycomb structure, with the at least one sheet metal foil disposed to form a receiver that extends into the interior. The honeycomb structure is then inserting into a sheathing tube that is formed with an opening that is aligned at least partly with the receiver. Then the various pieces are joined by way of a suitable joining technique. The novel method prevents the channels from being damaged during manufacture when receivers for sensors are subsequently produced and allows, for example, an especially effective conversion of exhaust gases.

Claims

1. A process for producing a metallic honeycomb body, which comprises the following steps:

providing metal foils and forming a void in at least one of the metal foils;

subsequently structuring the metal foils at least partially;

processing the at least partially structured metal foils with a process selected from the group of stacking and winding to form a honeycomb structure with passages for conducting a gas therethrough, and to place the at least one metal foil such that the void defines a receptacle extending into an interior of the honeycomb structure and being configured to receive therein a sensor device;

providing a tubular casing with an opening and introducing the honeycomb structure into the tubular casing, with the opening at least partly aligned with the receptacle; and

connecting the metal foils and the tubular casing with a suitable joining technique.

2. The process according to claim 1, which comprises forming the at least partially structured metal foils to form a honeycomb body for a catalytic converter forming passages for an exhaust gas from an internal combustion engine.

3. The process according to claim 1, which comprises forming the receptacle to define a blind bore.

4. The process according to claim 1, wherein the metal foils have a thickness of less than 0.03 mm.

5. The process according to claim 1, which comprises stamping the voids from the metal foils.

6. The process according to claim 1, wherein the processing step comprises initially stacking the metal foils and subsequently winding in an S shape.

7. The process according to claim 6, wherein the voids are U-shaped recesses.

8. The process according to claim 7, which comprises forming the recesses of adjacent metal foils with mutually different depths.

9. The process according to claim 6, which comprises forming the receptacle, at least in sections thereof, to follow a profile of the metal foils.

10. The process according to claim 9, which comprises inserting a sensor having a shape corresponding to a shape of the receptacle.

11. The process according to claim 1, wherein the processing step comprises initially stacking the metal foils and arranging the metal foils to run in an involute form from an inside outward towards the tubular casing.

12. The process according to claim 11, wherein the voids are U-shaped recesses.

13. The process according to claim 12, which comprises forming the recesses of adjacent metal foils with mutually different depths.

14. The process according to claim 11, which comprises forming the receptacle, at least in sections thereof, to follow a profile of the metal foils.

15. The process according to claim 14, which comprises inserting a sensor having a shape corresponding to a shape of the receptacle.