Muffler
US4971166A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Feb 3, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2490/155
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A muffler for an internal combustion engine comprises: a communicating passage constituting member allowing a plurality of chambers formed by partitioning walls inside an outer shell to be communicated with each other; and a butterfly-type valve provided in the communicating passage. The communicating passage constituting member is formed into the shape of a gutter so as to face either an inner surface of the outer shell at an open side of the constituting member or an outer surface of the outer shell at an open side of the constituting member. Alternatively, the communicating passage constituting member is constituted by a pipe and is provided in the outer shell. The arrangement makes it possible to improve the engine output, reduce the back pressure, and enhance the sound-damping effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.