Exhaust system of engine
US8640821B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2012 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Dec 18, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2590/04
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An exhaust system for an engine includes an exhaust pipe connected to an exhaust port of an engine and a muffler attached to the exhaust pipe and configured to reduce exhaust noise. The muffler includes an inner cylinder part connected to the downstream end of the exhaust pipe, an outer cylinder part configured to cover an outside of the inner cylinder part and noise absorbing materials disposed between the inner cylinder part and the outer cylinder part. A plurality of first communication holes providing communication between an inside and an outside of the inner cylinder part is formed in an upstream portion of the inner cylinder part. A plurality of second communication holes providing communication between the inside and the outside of the inner cylinder part is formed in a downstream portion of the inner cylinder part. Guide walls extend toward the inside of the inner cylinder part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.