Outboard engine with acoustic seals installed in motor housing opening
US6419535B1 · kind B1 · utility
23Cited by
4References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 2000 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | May 15, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B61/045
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The escape of acoustic energy via an opening in a motor housing penetrated by a steering arm is reduced by installing a pair of acoustic seals. The seals have respective membranes which extend across respective portions of the opening in the housing. These membranes are flexible, self-supporting and substantially block the transmission therethrough of acoustic wave energy in the range of 1,000 to 3,000 hertz. The acoustic seals installed in the housing opening, in combination with a vibro-acoustic treatment applied on the inner surface of the motor housing, suppress noise produced by the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.