Patent US1923009A successfully refreshed from Google Patents.
Patent US3031191A successfully refreshed from Google Patents.
US4912930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance exhaust system for internal combustion engine
Assignee: Yamaha Motor Co Ltd
•
Filing: 1988-12-12
•
Granted: 1990-04-03
•
Expires: 2008-12-12
Abstract
Abstract A high output, multiple cylinder internal combustion engine embodying an improved exhaust system. Each cylinder of the engine discharges into a common expansion chamber through a respective exhaust pipe. Valves are provided for preventing the transmission of exhaust pressure pulses back to the combustion chamber exhaust ports.
Inventors
- 👤 Hideaki Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:14
CPC Classifications
F; F02; F02B; F02B27/00; F02B27/04; F02B27/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
In an internal combustion engine having a plurality of combustion chambers, an exhaust port for each of said combustion chambers for discharging exhaust gases from said combustion chambers, a plurality of exhaust pipes each extending from a respective inlet end at a respective one of said exhaust ports for conveying exhaust gases therefrom to a respective outlet end, and an expansion chamber into which said exhaust pipe outlet ends discharge, the improvement comprising valve means adjustably positioned directly at said exhaust pipe outlet ends for restricting the transmission of exhaust pulses from said expansion chamber back to said exhaust ports through the full length of said exhaust pipes, and means for adjusting the position of said valve means in response to an engine condition.
Claim 2
Dependent Claim
124 words
In an internal combustion engine having a plurality of combustion chambers, an exhaust port for each of said combustion chambers for discharging exhaust gases from said combustion chambers, a plurality of exhaust pipes each extending from a respective inlet end at a respective one of said exhaust ports for conveying exhaust gases therefrom to a respective outlet end, and an expansion chamber into which said exhaust pipe outlet ends discharge, the improvement comprising valve means adjustably positioned directly at said exhaust pipe outlet ends for restricting the transmission of exhaust pulses from said expansion chamber back to said exhaust ports through the full length of said exhaust pipes, and means for adjusting the position of said valve means in response to an engine condition.
Claim 3
Dependent Claim
23 words
In an internal combustion engine as set forth in claim 1 wherein the valve means comprises a valve cooperating with each exhaust pipe.
Claim 4
Dependent Claim
18 words
In an internal combustion engine as set forth in claim 1 wherein the engine condition comprises engine speed.
Claim 5
Dependent Claim
26 words
In an internal combustion engine as set forth in claim 3 wherein the valve means is closed when the engine speed is below a predetermined speed.
Claim 6
Dependent Claim
23 words
In an internal combustion engine as set forth in claim 4 wherein the valve means comprises a valve cooperating with each exhaust pipe.
References Cited (Backward Citations)
US933906A
Cited
US1411226A
Cited
GB231156A
Cited
GB262044A
Cited
US2305946A
Cited
US2239262A
Cited
GB519806A
Cited
US2230740A
Cited
GB572724A
Cited
GB542429A
Cited
GB561932A
Cited
US2627851A
Cited
US2644436A
Cited
US2717583A
Cited
US2686398A
Cited
US3523418A
Cited
US3817227A
Cited
US3751921A
Cited
US3703937A
Cited
US3938330A
Cited
US3969895A
Cited
JPS5154118A
Cited
US4051821A
Cited
US4226298A
Cited
US4254752A
Cited
US4539813A
Cited
US4558566A
Cited
US4545200A
Cited
US4522029A
Cited
US4554785A
Cited
JPS6032920A
Cited
FR2567194A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |