IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0694458
(1991-05-01)
|
|
발명자
/ 주소 |
- Rigsby Donald R. (Jenison MI)
|
| 출원인 / 주소 |
- Benteler Industries, Inc. (Grand Rapids MI 02)
|
| 인용정보 |
피인용 횟수 :
55 인용 특허 :
0 |
초록
▼
A method of forming a tubular, double wall, air gap, exhaust duct component for an internal combustion engine, the resulting exhaust duct component, and the blank for such, involving providing an inner membrane duct element, with orifices therethrough spaced along its length, providing an outer stru
A method of forming a tubular, double wall, air gap, exhaust duct component for an internal combustion engine, the resulting exhaust duct component, and the blank for such, involving providing an inner membrane duct element, with orifices therethrough spaced along its length, providing an outer structural duct element in 360 degree engagement with the inner duct element in the areas where forming and bending operations are to be performed, conducting such forming and bending operations, securing the resulting blank in a hydroforming die cavity, sealing the ends of the inner element to the ends of the outer element, plugging the ends of the inner element, injecting a liquid, preferably water, into the inner duct element and increasing the pressure on the liquid to expand the outer element away from the inner element and ultimately into conformity with the die cavity while the inner element floats in place, in a manner to create an air gap substantially over the full length of the duct component, i.e., except at the ends.
대표청구항
▼
A method of forming a tubular, double wall, air gap exhaust duct component for an internal combustion engine, comprising the steps of: providing a thin walled, inner membrane duct element having a predetermined configuration, a plurality of spaced orifices through said wall along its length, and a p
A method of forming a tubular, double wall, air gap exhaust duct component for an internal combustion engine, comprising the steps of: providing a thin walled, inner membrane duct element having a predetermined configuration, a plurality of spaced orifices through said wall along its length, and a pair of ends; providing an imperforate outer structural duct element having an initial configuration generally matching that of said inner duct element configuration, and a pair of ends; assembling said inner duct element inside said outer duct element to provide a dual wall blank; sealing said inner duct ends to said outer duct ends to close off said outer duct ends, closing said inner duct ends with plugging mandrels, and placing and securing said blank in a hydroform die cavity having a confining wall of desired final configuration for said outer duct element of said duct component; injecting a liquid into said inner duct element, and increasing the pressure on said liquid in a manner causing said liquid to flow through said orifices and expand said outer duct element ultimately into engagement with said die confining wall, while causing said inner duct element between its ends to retain essentially its initial size, location and configuration within said expanding outer element, to create an air gap between said elements over substantially the length thereof; and then releasing the pressure and draining said liquid from said duct elements.
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