US4243000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction system of multi-cylinder engine
Assignee: Yamaha Motor Co Ltd
•
Filing: 1978-12-01
•
Granted: 1981-01-06
•
Expires: 1998-12-01
Abstract
Abstract An induction system for a multi-cylinder internal combustion engine that improves fuel efficiency and reduces the emission of unwanted exhaust gas constituents, particularly at the low and medium load conditions. The engine induction system comprises a plurality of separate carburetor barrels which, at least under some running conditions, serve cylinders separately from each other through main induction passages. One carburetor barrel is provided with a different fuel discharge system than the other carburetor barrels for accomodating a certain engine operating condition. A separate sub-intake system connects this carburetor barrel with other cylinders not normally served by the particular carburetor barrel in question. This sub-intake system has a substantially smaller cross-sectional area in the main intake system so that the charge drawn into the cylinders through the sub-intake system enters at a substantially higher velocity. This improves combustion by creating turbulence under at least some operating conditions. Several embodiments of throttle valve constructions are disclosed for insuring complete closure and sealing of at least one throttle valve of the induction control system for precluding leakage. In some embodiments this is accomplished by providing a resilient section in the throttle body and in other embodiments the result is obtained by providing a resilient seal on the periphery of the throttle valve.
Inventors
- 👤 Minoru Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:43
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/1015; F02M35/10183; F02B; F02B31/00; F02B31/08; F02D; F02D9/00; F02D9/08; F02D9/10; F02D9/1005; F02D9/101; F02D9/1015; F02D9/1035; F02D9/104; F02D9/1045; F02D9/1055; F02D9/109; F02M13/00; F02M13/02; F02M19/00; F02M35/10006; F02M35/10078; F02M35/10085; F02M35/104; F02M35/108; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
242 words
In an internal combustion engine having at least two variable volume chambers in which combustion occurs, a first charge forming device, a second charge forming device, first and second main induction passages, each connecting a respective one of said charge forming devices with a respective one of said chambers only for delivering a charge from the charge forming device to the respective chamber, an auxiliary induction passage connecting said first charge forming device with each of said chambers for delivering a charge from said first charge forming device to each of said chambers, said first charge forming device having supply means to supply a charge adapted to serve a specific engine operating condition for each of said chambers, said second charge forming device being devoid of such a specific supply means, and valve means for controlling the rate of communication of said charge forming devices with said chambers through the respective induction passages, said valve means including a pair of throttle valves, each of said throttle valves controlling the flow through a respective one of said main induction passages, the improvement comprising the throttle valve in said second main induction passage and said second main induction passage having adjacent surfaces juxtaposed to each other when said throttle valve is in its closed position and means providing a seal between said surfaces when said throttle valve in said second main induction passage is closed to effectively preclude any leakage past said throttle valve.
Claim 2
Dependent Claim
242 words
In an internal combustion engine having at least two variable volume chambers in which combustion occurs, a first charge forming device, a second charge forming device, first and second main induction passages, each connecting a respective one of said charge forming devices with a respective one of said chambers only for delivering a charge from the charge forming device to the respective chamber, an auxiliary induction passage connecting said first charge forming device with each of said chambers for delivering a charge from said first charge forming device to each of said chambers, said first charge forming device having supply means to supply a charge adapted to serve a specific engine operating condition for each of said chambers, said second charge forming device being devoid of such a specific supply means, and valve means for controlling the rate of communication of said charge forming devices with said chambers through the respective induction passages, said valve means including a pair of throttle valves, each of said throttle valves controlling the flow through a respective one of said main induction passages, the improvement comprising the throttle valve in said second main induction passage and said second main induction passage having adjacent surfaces juxtaposed to each other when said throttle valve is in its closed position and means providing a seal between said surfaces when said throttle valve in said second main induction passage is closed to effectively preclude any leakage past said throttle valve.
Claim 3
Dependent Claim
26 words
An internal combustion engine as set forth in claim 1 wherein the means providing a seal is a resilient element carried by one of the surfaces.
Claim 4
Dependent Claim
28 words
An internal combustion engine as set forth in claim 2 wherein the resilient element comprises a section of the wall of the induction passage defining its respective surfaces.
Claim 5
Dependent Claim
23 words
An internal combustion engine as set forth in claim 2 wherein the resilient element is carried by the periphery of the throttle valve.
Claim 6
Dependent Claim
18 words
An internal combustion engine as set forth in claim 4 wherein the resilient element is a separate member.
Claim 7
Dependent Claim
18 words
An internal combustion engine as set forth in claim 5 wherein the resilient element comprises a non-metallic ring.
Claim 8
Dependent Claim
18 words
An internal combustion engine as set forth in claim 4 wherein the resilient member is a metallic ring.
Claim 9
Dependent Claim
45 words
An internal combustion engine as set forth in claim 7 wherein the metallic ring is split and further including biasing spring means interposed between said ring and the body of the throttle valve for urging said ring into sealing engagement with the induction passage surface.
Claim 10
Dependent Claim
45 words
An internal combustion engine as set forth in claim 7 wherein the throttle valve is mounted upon a shaft, said shaft having a slot through which said throttle valve extends, the gap provided by the slit ends of said ring being positioned within said shaft.
Claim 11
Dependent Claim
18 words
An internal combustion engine as set forth in claim 1 wherein the sealing means comprises a labyrinth seal.
Claim 12
Dependent Claim
53 words
An internal combustion engine as set forth in claims 1 or 2 further including a port extending through the induction passage surface adjacent the periphery of the throttle valve when the throttle valve is in its closed position, said throttle valve having reliefs from thereon on the upstream side thereof adjacent said port.
References Cited (Backward Citations)
US1977351A
Cited
US2385510A
Cited
US2586927A
Cited
US2657896A
Cited
US3543736A
Cited
US3713630A
Cited
US4086885A
Cited
US4094931A
Cited
US4099492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |