Patent US4795420A successfully refreshed from Google Patents.
US4795420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas control means for engine
Assignee: Yamaha Motor Co Ltd
•
Filing: 1987-03-06
•
Granted: 1989-01-03
•
Expires: 2007-03-06
Abstract
Abstract An improved valve for use in an exhaust system to increase the performance of the engine throughout the entire engine and load speed ranges by providing reflective areas that cooperate with the individual exhaust pipes of the engine to reduce pressure pulses in the combustion chamber during valve overlap periods. A number of embodiments of compact valve constructions are shown that employ relatively short journaling shafts for minimizing the effects of thermal expansion.
Inventors
- 👤 Tadashi Sakurai
- 👤 Wataru Fuchigami
- 👤 Hideaki Kitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:57
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/20; F02B27/00; F02B27/04; F02B27/06; F02B61/00; F02B61/02; F02B2075/1804; F02B2075/1816; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87153; Y10T137/87161
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
131 words
A valve for controlling the flow of exhaust gases simultaneously through a plurality of exhaust pipes comprising a valve body adapted to be affixed to said exhaust pipes for receiving exhaust gases therefrom, exhaust passage means formed in said valve body comprising a plurality of discrete exhaust passages each communicating with a respective exhaust pipe for receiving exhaust gases therefrom, said passage being placed in horizontally extending rows with some above the others, a valve shaft journaled in said valve body for rotation about an axis that extends transversely across said exhaust passage means and a valve element affixed to said valve shaft and having spaced portions cooperable with said exhaust passage means for controlling the reflective area for each of said exhaust pipes simultaneously upon rotation of said valve shaft.
Claim 2
Dependent Claim
131 words
A valve for controlling the flow of exhaust gases simultaneously through a plurality of exhaust pipes comprising a valve body adapted to be affixed to said exhaust pipes for receiving exhaust gases therefrom, exhaust passage means formed in said valve body comprising a plurality of discrete exhaust passages each communicating with a respective exhaust pipe for receiving exhaust gases therefrom, said passage being placed in horizontally extending rows with some above the others, a valve shaft journaled in said valve body for rotation about an axis that extends transversely across said exhaust passage means and a valve element affixed to said valve shaft and having spaced portions cooperable with said exhaust passage means for controlling the reflective area for each of said exhaust pipes simultaneously upon rotation of said valve shaft.
Claim 3
Dependent Claim
16 words
A valve as set forth in claim 1 wherein the discrete exhaust passages are vertically aligned.
Claim 4
Dependent Claim
15 words
A valve as set forth in claim 1 wherein the exhaust passages are vertically staggered.
Claim 5
Dependent Claim
20 words
A valve as set forth in claim 1 wherein the valve element portions are all formed on a common member.
Claim 6
Dependent Claim
27 words
A valve as set forth in claim 1 wherein the valve element portions are formed by separate valve elements all fixed for rotation to a common shaft.
Claim 7
Dependent Claim
44 words
A valve as set forth in claim 1 in combination with a plurality of exhaust pipes extending from an internal combustion engine and further including an expansion chamber positioned downstream of said valve body and receiving the exhaust gases from the exhaust passage means.
Claim 8
Dependent Claim
16 words
A valve as set forth in claim 6 wherein the discrete exhaust passages are vertically aligned.
Claim 9
Dependent Claim
15 words
A valve as set forth in claim 6 wherein the exhaust passages are vertically staggered.
Claim 10
Dependent Claim
20 words
A valve as set forth in claim 6 wherein the valve element portions are all formed on a common member.
Claim 11
Dependent Claim
27 words
A valve as set forth in claim 6 wherein the valve element portions are formed by separate valve elements all fixed for rotation to a common shaft.
Claim 12
Dependent Claim
152 words
In a motorcycle having a frame, a seat carried by said frame and adapted to carry a single rider seated in straddle fashion, a single dirigible front wheel and a single rear wheel, and an engine having a combined crankcase transmission assembly carried by said frame for driving said rear wheel, said engine having at least four exhaust ports, the improvement comprising a at least four exhaust pipes each extending from a respective exhaust port downwardly and passing beneath said engine crankcase transmission assembly and rearwardly relative thereto, said exhaust pipes being aligned in vertically spaced planes in an area beneath said crankcase transmission assembly with the uppermost exhaust pipes passing through a recess in said crankcase transmission assembly for maintaining ground clearance and minimizing the width occupied by said exhaust system, and a valve for controlling the flow through said exhaust pipes, said valve being disposed beneath said crankcase transmission assembly.
Claim 13
Dependent Claim
152 words
In a motorcycle having a frame, a seat carried by said frame and adapted to carry a single rider seated in straddle fashion, a single dirigible front wheel and a single rear wheel, and an engine having a combined crankcase transmission assembly carried by said frame for driving said rear wheel, said engine having at least four exhaust ports, the improvement comprising a at least four exhaust pipes each extending from a respective exhaust port downwardly and passing beneath said engine crankcase transmission assembly and rearwardly relative thereto, said exhaust pipes being aligned in vertically spaced planes in an area beneath said crankcase transmission assembly with the uppermost exhaust pipes passing through a recess in said crankcase transmission assembly for maintaining ground clearance and minimizing the width occupied by said exhaust system, and a valve for controlling the flow through said exhaust pipes, said valve being disposed beneath said crankcase transmission assembly.
Claim 14
Dependent Claim
19 words
In a vehicle as set forth in claim 11 wherein the exhaust pipes are transversely aligned with each other.
Claim 15
Dependent Claim
20 words
In a vehicle as set forth in claim 11 wherein the exhaust pipes are staggered transversely relative to each other.
References Cited (Backward Citations)
US933906A
Cited
US1228738A
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
US3591959A
Cited
US3523418A
Cited
JPS4927316B1
Cited
US3817227A
Cited
US3751921A
Cited
US3670844A
Cited
US3938330A
Cited
US3969895A
Cited
JPS5154118A
Cited
US4051821A
Cited
JPS54174719U
Cited
US4254752A
Cited
JPS56154539A
Cited
US4427087A
Cited
JPS57186013A
Cited
JPS58158311A
Cited
US4539813A
Cited
US4558566A
Cited
US4545200A
Cited
US4522029A
Cited
US4554785A
Cited
JPS6072925U
Cited
JPS60132018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |