US4359865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system for multicylinder motorbike engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1980-08-28
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Granted: 1982-11-23
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Expires: 2000-08-28
Abstract
Abstract An exhaust system for a multicylinder motorbike internal combustion engine. Each cylinder has a respective exhaust pipe. The pipes merge and discharge into a chamber, from which chamber a plurality of silencers, fewer in number than the cylinders, discharges exhaust gases to the atmosphere.
Inventors
- 👤 Yasuo Nakao
- 👤 Nobuo Norimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:25
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/04; F01N13/08; F01N2590/00; F01N2590/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
An exhaust system for a multi-cylinder internal combustion engine for a motorbike, comprising: a plurality of exhaust pipes equal in number to the number of cylinders extending from respective ones of said cylinders; an exhaust chamber formed in a casing, said casing having an entry opening for each of said exhaust pipes, said exhaust pipes, in pairs, being convergently joined to form a gang pipe which continues the flow of each said pair of exhaust pipes and discharges into said exhaust chamber, said exhaust pipes and gang pipe having a substantial length inside said exhaust chamber; and a silencer in communication with said exhaust chamber to exhaust gases therefrom, there being a greater number of exhaust pipes than silencers.
Claim 2
Dependent Claim
119 words
An exhaust system for a multi-cylinder internal combustion engine for a motorbike, comprising: a plurality of exhaust pipes equal in number to the number of cylinders extending from respective ones of said cylinders; an exhaust chamber formed in a casing, said casing having an entry opening for each of said exhaust pipes, said exhaust pipes, in pairs, being convergently joined to form a gang pipe which continues the flow of each said pair of exhaust pipes and discharges into said exhaust chamber, said exhaust pipes and gang pipe having a substantial length inside said exhaust chamber; and a silencer in communication with said exhaust chamber to exhaust gases therefrom, there being a greater number of exhaust pipes than silencers.
Claim 3
Dependent Claim
34 words
An exhaust system according to claim 1 in which two pairs of exhaust pipes are merged into respective gang pipes, one gang pipe for each said pair, and in which two silencers are provided.
Claim 4
Dependent Claim
22 words
An exhaust system according to claim 2 in which said gang pipes discharge separately, at spaced apart locations, into said exhaust chamber.
Claim 5
Dependent Claim
42 words
An exhaust pipe according to claim 2 in which one exhaust pipe of each pair is connected to a cylinder of one bank of said engine, and the other exhaust pipe of each pair is connected to a cylinder of another bank.
Claim 6
Dependent Claim
29 words
An exhaust system according to claim 1 in which all exhaust pipes are merged into a single gang pipe which is disposed in, and discharges into, said exhaust chamber.
Claim 7
Dependent Claim
18 words
An exhaust system according to claim 5 in which at least four pipes and two silencers are provided.
References Cited (Backward Citations)
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Cited
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Cited
US3189122A
Cited
US3420052A
Cited
US3516247A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |