US4312422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust silencer for outboard engine with a reflection chamber
Assignee: Yamaha Marine Co Ltd
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Filing: 1980-05-30
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Granted: 1982-01-26
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Expires: 2000-05-30
Abstract
Abstract An exhaust silencer for an outboard engine including an expansion chamber for reducing the exhaust noise. A reflection chamber having an open end and a closed end is placed with its open end communicating with the expansion chamber at a location which is reversely spaced from the open end of an exhaust pipe discharging into the expansion chamber. This enables the engine to be operated optimally in a plurality of engine speed ranges and for the silencer to occupy a minimal volume.
Inventors
- 👤 Yukio Matsushita
- 👤 Takehisa Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/086; F01N1/088; F01N1/06; F02; F02B; F02B61/00; F02B61/04; F02B61/045
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
In an exhaust device for an outboard engine which includes an expansion chamber having communication with the exhaust port of an engine unit for discharging engine exhaust gases therethrough, the improvement comprising a reflection chamber of predetermined length with one end opened into said expansion chamber and its other end closed, an exhaust pipe projecting into said expansion chamber and discharging through an opening end of said exhaust pipe, said open end of said reflection chamber being reversely spaced from said open end of said exhaust pipe, and reversely faced relative thereto.
Claim 2
Dependent Claim
92 words
In an exhaust device for an outboard engine which includes an expansion chamber having communication with the exhaust port of an engine unit for discharging engine exhaust gases therethrough, the improvement comprising a reflection chamber of predetermined length with one end opened into said expansion chamber and its other end closed, an exhaust pipe projecting into said expansion chamber and discharging through an opening end of said exhaust pipe, said open end of said reflection chamber being reversely spaced from said open end of said exhaust pipe, and reversely faced relative thereto.
Claim 3
Dependent Claim
18 words
Apparatus according to claim 1 in which a plurality of said reflection chambers of different lengths are provided.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 1 in which said reflection chamber is accommodated inside said expansion chamber.
Claim 5
Dependent Claim
16 words
Apparatus according to claim 2 in which said reflection chambers are accommodated inside said expansion chamber.
Claim 6
Dependent Claim
19 words
Apparatus according to claim 1 in which a portion of said reflection chamber extends outside of said expansion chamber.
Claim 7
Dependent Claim
23 words
Apparatus according to claim 2 in which a portion of at least one of said reflection chamber extends outside of said expansion chamber.
Claim 8
Dependent Claim
17 words
Apparatus according to claim 1 in which a water vent hole is formed in said reflection chamber.
Claim 9
Dependent Claim
17 words
Apparatus according to claim 1 in which said reflection chamber extends peripherally relative to said expansion chamber.
Claim 10
Dependent Claim
17 words
Apparatus according to claim 1 in which said reflection chamber extends longitudinally relative to said expansion chamber.
Claim 11
Dependent Claim
18 words
Apparatus according to claim 8 in which a plurality of said reflection chambers of different lengths are provided.
Claim 12
Dependent Claim
18 words
Apparatus according to claim 9 in which a plurality of said reflection chambers of different lengths are provided.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |