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Patent US4622928A successfully refreshed from Google Patents.
US4622928A
Expired / Lapsed
US
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Exhaust control system for two-cycle engine
Assignee: Kawasaki Motors Ltd
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Filing: 1985-03-19
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Granted: 1986-11-18
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Expires: 2005-03-19
Abstract
Abstract An exhaust control system for a two-cycle engine wherein the cross-sectional area of an exhaust is controlled in accordance with the rpm. of the engine by opening and closing at least one auxiliary exhaust passage with respect to a main exhaust passage. The main exhaust passage and the auxiliary exhaust passage connected to the cylinder are located parallel to each other circumferentially of the cylinder, and the rotary valve in the form of a shaft disposed parallel to the center line of the cylinder is operative to open and close the auxiliary exhaust passage with respect to the main exhaust passage in accordance with an increase and a decrease in the engine speed.
Inventors
- 👤 Eizaburo Uchinishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:37
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02B; F02B33/00; F02B33/02; F02B33/28; F02B33/30; F02D9/00; F02D9/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
An exhaust control system for a two-cycle engine having at least one cylinder comprising: a main exhaust passage communicating with said cylinder; at least one auxiliary exhaust passage located laterally of said main exhaust passage circumferentially of a cylinder; and at least one rotary valve for adjustably opening and closing said auxiliary exhaust passage, said rotary valve being in the form of a shaft located parallel to a center line of the cylinder and interposed between the main exhaust passage and said auxiliary exhaust passage for rotation; wherein said auxiliary exhaust passage remains closed with respect to the main exhaust passage when the engine operates at a low engine speed range and is successively opened with respect to the main exhaust passage as the speed of the engine increases.
Claim 2
Dependent Claim
129 words
An exhaust control system for a two-cycle engine having at least one cylinder comprising: a main exhaust passage communicating with said cylinder; at least one auxiliary exhaust passage located laterally of said main exhaust passage circumferentially of a cylinder; and at least one rotary valve for adjustably opening and closing said auxiliary exhaust passage, said rotary valve being in the form of a shaft located parallel to a center line of the cylinder and interposed between the main exhaust passage and said auxiliary exhaust passage for rotation; wherein said auxiliary exhaust passage remains closed with respect to the main exhaust passage when the engine operates at a low engine speed range and is successively opened with respect to the main exhaust passage as the speed of the engine increases.
Claim 3
Dependent Claim
52 words
An exhaust control system according to claim 1 wherein said at least one auxiliary exhaust passage communicates at one end with said cylinder and at the other end with said main exhaust passage, and said rotary valve is located at the junction of said auxiliary exhaust passage and said main exhaust passage.
Claim 4
Dependent Claim
19 words
An exhaust control system according to claim 1 wherein said rotary valve is rotated by a rack and pinion.
Claim 5
Dependent Claim
32 words
An exhaust control system according to claim 1 wherein said at least one auxiliary exhaust passage comprises two auxiliary exhaust passages and said at least one rotary valve comprises two rotary valves.
Claim 6
Dependent Claim
22 words
An exhaust control system according to claim 1 wherein rotation of said at least one rotary valve is controlled by governor means.
Claim 7
Dependent Claim
17 words
An exhaust control system according to claim 5 wherein said governor means is a centrifugal ball-type governor.
Claim 8
Dependent Claim
29 words
An exhaust control system according to claim 1 wherein said engine additionally includes an expansion chamber which communicates with said main exhaust passage through at least one expansion passage.
Claim 9
Dependent Claim
19 words
An exhaust control system according to claim 7 wherein said at least one expansion passage comprises two expansion passages.
Claim 10
Dependent Claim
32 words
An exhaust control system according to claim 7 wherein said at least one rotary valve additionally serves to open and close said at least one expansion passage in response to engine speed.
Claim 11
Dependent Claim
44 words
An exhaust control system according to claim 9 wherein said rotary valve opens communication between said main exhaust passage and said at least one auxiliary exhaust passage as said valve closes communication between said main exhaust passage and said at least one expansion passage.
References Cited (Backward Citations)
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Cited
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JPS52132916A
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |