Muffler and its manufacturing method
US6223434A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1999 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Jul 30, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49398
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A muffler is constructed by inner and outer pipes, in which opposite end portions of the outer pipe are reduced in diameter, a welding portion of the inner pipe is accurately formed, and in this muffler, in order that a welding portion of the inner pipe can be accurately formed and that the outer pipe can be reduced in diameter uniformly over an entire periphery thereof to compress a buffer member uniformly over an entire periphery thereof, the inner pipe (2), having the buffer member (8) fitted on one end portion 2a thereof, is held within the outer pipe (1), held in position, in such a manner that a predetermined gap is formed between the inner and outer pipes (2) and (1). Subsequently, a diameter of the other end portion (1b) of the outer pipe (1) remote from the buffer member (8) is reduced, thereby fixedly securing this other end portion to the other end portion 1b of the inner pipe (2). Subsequently, a spinning processing is applied to one end portion (1a) of the outer pipe (1), thereby reducing a diameter of this one end portion until this one end portion (2a) is brought into contact with the buffer member (8), and further radially compresses the buffer member (8).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.