Exhaust muffler
US4880078A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 29, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Jun 29, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2530/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An exhaust muffler for use with an internal combustion engine has at least one internal suppression chamber, at least one inlet pipe for receiving exhaust gases from the internal combustion engine, and at least one outlet pipe vented to atmosphere. The exhaust muffler comprises a plurailty of component units connected in series with each other and each having the internal suppression chamber. Each of the component units has a casing having an inner layer of a sound-absorbing material which defines the internal suppression chamber, and a connector pipe connected to and extending through the casing, the connector pipe having upstream and downstream ends projecting out of the casing, the connector pipe having at least one opening which opens into the internal suppression chamber. At least one of the component units is constructed to meet: ##EQU1## where V is the volume of the internal suppression chamber, l and S are the effective pipe length of and cross-sectional area of a flow passage in the main exhaust pipe extending from the internal suppression chamber of the at least one of the component units to one of the internal suppression chamber of the next component unit and the end ve…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.