US4621596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust control system
Assignee: Kawasaki Motors Ltd
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Filing: 1984-10-30
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Granted: 1986-11-11
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Expires: 2004-10-30
Abstract
Abstract An exhaust control system for a 2-cycle engine having at least one combustion cylinder with a longitudinal axis comprises a main exhaust passage and an exhaust sub-passage communicating with the cylinder through respective main and sub-exhaust ports. The sub-port is located laterally of and in spaced relationship to the main exhaust port and further lies in a common plane arranged perpendicular to the cylinder axis. A control means is included which varies the degree of opening of the exhaust sub-passage in accordance with engine speed whereby timing of the ports is not altered.
Inventors
- 👤 Eizaburo Uchinishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:19
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02B; F02B33/00; F02B33/02; F02B33/28; F02B33/30; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
An exhaust control system for a 2-cycle engine having at least one combustion cylinder with a longitudinal axis comprising: a main exhaust passage communicating with said cylinder through a main exhaust port; an exhaust sub-passage communicating with said cylinder through an exhaust sub-port, said sub-port located laterally of and in spaced relationship to said main exhaust port, said exhaust sub-port and said main exhaust port lying in a common plane arranged perpendicular to said longitidinal axis; and controlling means for varying the degree of opening of said sub-passage in accordance with engine speed whereby timing of opening and closing of said exhaust ports is not altered due to opening and closing of said exhaust sub-port.
Claim 2
Dependent Claim
115 words
An exhaust control system for a 2-cycle engine having at least one combustion cylinder with a longitudinal axis comprising: a main exhaust passage communicating with said cylinder through a main exhaust port; an exhaust sub-passage communicating with said cylinder through an exhaust sub-port, said sub-port located laterally of and in spaced relationship to said main exhaust port, said exhaust sub-port and said main exhaust port lying in a common plane arranged perpendicular to said longitidinal axis; and controlling means for varying the degree of opening of said sub-passage in accordance with engine speed whereby timing of opening and closing of said exhaust ports is not altered due to opening and closing of said exhaust sub-port.
Claim 3
Dependent Claim
83 words
An exhaust control system for a 2-cycle engine according to claim 1 wherein said controlling means includes an axially movable valve positionable to variably block said sub-port, a lever mechanism connected to said valve and adapted to move said valve axially to change the degree of opening of said sub-port, a rotary governor connected to said lever mechanism and adapted to actuate said lever mechanism, and a gear mechanism connected to the crankshaft of said engine and adapted to drive said rotary governor.
Claim 4
Dependent Claim
23 words
An exhaust control system according to claim 1 wherein said controlling means includes an axially movable valve positionable to variably block said sub-passage.
Claim 5
Dependent Claim
63 words
An exhaust control system according to claim 1 wherein said controlling means includes an axially movable valve positionable to variably block said exhaust sub-passage wherein said exhaust sub-passage remains closed with respect to said main exhaust passage when the engine operates at a low engine speed and is successively opened with respect to the main exhaust passage as speed of the engine increases.
Claim 6
Dependent Claim
47 words
An exhaust control system according to claim 1 wherein said exhaust sub-passage communicates at one end with said cylinder and at the other end with said main exhaust passage, and said valve is located proximate to a juncture of said exhaust sub-passage and said main exhaust passage.
Claim 7
Dependent Claim
18 words
An exhaust control system according to claim 1 wherein said movable valve is slidably supported by a sleeve.
Claim 8
Dependent Claim
30 words
An exhaust control system according to claim 6 wherein said valve has a stem which is slidably supported within a central bore formed in a plug located within said sleeve.
Claim 9
Dependent Claim
24 words
An exhaust control system according to claim 6 wherein said movable valve has a stem having a longitudinal axis arranged parallel to said plane.
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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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |