Patent US4570439A successfully refreshed from Google Patents.
US4570439A
Expired / Lapsed
US
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Exhaust control system for 2-cycle engines
Assignee: Kawasaki Motors Ltd
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Filing: 1984-12-11
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Granted: 1986-02-18
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Expires: 2004-12-11
Abstract
Abstract An exhaust control system for 2-cycle engines has a main exhaust passage, auxiliary exhaust passages arranged in parallel with the main exhaust passage, and an expansion chamber communicatable with the main exhaust passage. During low-speed operation of the engine, the auxiliary exhaust passages are shut-off while the expansion chamber is connected to the main exhaust passage, whereas, during high-speed operation of the engine, the auxiliary exhaust passages are opened and the expansion chamber is closed.
Inventors
- 👤 Eizaburo Uchinishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:46
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02B; F02B27/00; F02B27/04; F02B27/06; F02B33/00; F02B33/02; F02B33/28; F02B33/30; F02F; F02F1/00; F02F1/18; F02F1/22; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
An exhaust control system for 2-cycle engine comprising: a main exhaust passage opening into the combustion chamber; at least one auxiliary exhaust passage opening into said combustion chamber on the side of the main exhaust passage and leading to an intermediate portion of said main exhaust passage; a control valve provided in said auxiliary exhaust passage and adapted to selectively shut-off said at least one auxiliary exhaust passage; an expansion chamber communicatable with said main exhaust passage through said control valve; and a valve operating means for operating said control valve such that, when said engine is operating at low speed, said control valve allows said expansion chamber to be communicated with said main exhaust passage while shutting off said at least one auxiliary exhaust passage and, as the engine speed is increased, said control valve gradually shut off said expansion chamber from said main exhaust passage while gradually opening said at least one auxiliary exhaust passage.
Claim 2
Dependent Claim
157 words
An exhaust control system for 2-cycle engine comprising: a main exhaust passage opening into the combustion chamber; at least one auxiliary exhaust passage opening into said combustion chamber on the side of the main exhaust passage and leading to an intermediate portion of said main exhaust passage; a control valve provided in said auxiliary exhaust passage and adapted to selectively shut-off said at least one auxiliary exhaust passage; an expansion chamber communicatable with said main exhaust passage through said control valve; and a valve operating means for operating said control valve such that, when said engine is operating at low speed, said control valve allows said expansion chamber to be communicated with said main exhaust passage while shutting off said at least one auxiliary exhaust passage and, as the engine speed is increased, said control valve gradually shut off said expansion chamber from said main exhaust passage while gradually opening said at least one auxiliary exhaust passage.
References Cited (Backward Citations)
JPS55132321A
Cited
US4522029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |