Patent US5251584A successfully refreshed from Google Patents.
US5251584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two cycle engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1992-11-12
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Granted: 1993-10-12
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Expires: 2012-11-12
Abstract
Abstract Two embodiments of two cycle, crankcase compression engines wherein exhaust emissions are controlled by controlling the amount of scavenging air flow at low and mid ranges. The scavenging air flow is controlled by balance passages that interconnect at least two crankcase chambers of the engine and in which a control valve is provided. In one embodiment, the balance passage is positioned above the crankcase chambers and communicates with them through downwardly extending passages so as to preclude the likelihood of condensation of fuel or lubricant in the balance passages and to return any fuel or lubricant to the crankcase chambers.
Inventors
- 👤 Akihiko Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:41
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02B; F02B33/00; F02B33/02; F02B33/04; F02B33/28; F02B39/00; F02B39/16; F02D9/00; F02D9/02; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B3/00; F02B3/06; F02D2009/0201; F02D2009/0291; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
83 words
A two cycle, crankcase compression, internal combustion engine having at least three crankcase chambers to which an air charge is admitted, scavenge passages for transferring the charge from each of said crankcase chambers to respective combustion chambers, a balance passage, means interconnecting each of said crankcase chambers independently with said balance passage, and control valve means for controlling the communication of said crankcase chambers with said interconnecting means for controlling the communication of said crankcase chambers with each other through said balance passage.
Claim 2
Dependent Claim
83 words
A two cycle, crankcase compression, internal combustion engine having at least three crankcase chambers to which an air charge is admitted, scavenge passages for transferring the charge from each of said crankcase chambers to respective combustion chambers, a balance passage, means interconnecting each of said crankcase chambers independently with said balance passage, and control valve means for controlling the communication of said crankcase chambers with said interconnecting means for controlling the communication of said crankcase chambers with each other through said balance passage.
Claim 3
Dependent Claim
31 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 1 further including means independent of the balance passage for introducing an air charge to the crankcase chambers.
Claim 4
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 1 wherein the engine operates on a diesel cycle and fuel is injected into the combustion chambers for combustion.
Claim 5
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 3 further including means independent of the balance passage means for introducing an air charge to the crankcase chambers.
Claim 6
Dependent Claim
46 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 1 wherein there are provided means for operating the control valve means for opening the control valve means at low and mid range loads and closing the control valve means at higher loads.
Claim 7
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 1 having each crankcase chamber communicating with the balance passage with interconnecting means having said control valve means therein.
Claim 8
Dependent Claim
92 words
A two cycle, crankcase compression, internal combustion engine having at least two crankcase chambers to which an air charge is admitted, scavenge passages for transferring a charge from said crankcase chambers to a respective combustion chamber, a balance passage, means interconnecting each of said crankcase chambers independently with said balance passage, and control valve means for controlling the communication of said crankcase chambers with said interconnecting means for controlling the communication of said crankcase chambers with each other through said balance passage, said balance passage being disposed externally of said crankcase chambers.
Claim 9
Dependent Claim
92 words
A two cycle, crankcase compression, internal combustion engine having at least two crankcase chambers to which an air charge is admitted, scavenge passages for transferring a charge from said crankcase chambers to a respective combustion chamber, a balance passage, means interconnecting each of said crankcase chambers independently with said balance passage, and control valve means for controlling the communication of said crankcase chambers with said interconnecting means for controlling the communication of said crankcase chambers with each other through said balance passage, said balance passage being disposed externally of said crankcase chambers.
Claim 10
Dependent Claim
38 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 7 wherein the engine has at least three crankcase chambers, each communicating with the balance passage with interconnecting means having said control valve means therein.
Claim 11
Dependent Claim
74 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 1 wherein the means interconnecting each of the crankcase chambers independently with the balance passage comprises a plurality of interconnecting passages each communicating at one end with a respective crankcase chamber and at the other end with the balance passage, each communicating passage extending upwardly from its one end so that fluid collecting therein will flow back to the crankcase chamber.
Claim 12
Dependent Claim
25 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 9 wherein the balance passage is positioned vertically above the crankcase chambers.
Claim 13
Dependent Claim
85 words
A two cycle, crankcase compression, internal combustion engine having at least two crankcase chambers to which an air charge is admitted, scavenge passages for transferring a charge from said crankcase chambers to a combustion chamber, balance passage, and communicating conduits each communicating at one end with said balance passage and at the other end with a respective one of said crankcase chambers, said communicating conduits each extending upwardly from their one ends so as to return any lubricant collecting therein to the respective crankcase chamber.
Claim 14
Dependent Claim
85 words
A two cycle, crankcase compression, internal combustion engine having at least two crankcase chambers to which an air charge is admitted, scavenge passages for transferring a charge from said crankcase chambers to a combustion chamber, balance passage, and communicating conduits each communicating at one end with said balance passage and at the other end with a respective one of said crankcase chambers, said communicating conduits each extending upwardly from their one ends so as to return any lubricant collecting therein to the respective crankcase chamber.
Claim 15
Dependent Claim
25 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 11 wherein the balance passage is positioned vertically above the crankcase chambers.
Claim 16
Dependent Claim
31 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 11 further including means independent of the balance passage for introducing an air charge to the crankcase chambers.
Claim 17
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 11 wherein the engine operates on a diesel cycle and fuel is injected into the combustion chambers for combustion.
Claim 18
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 14 further including means independent of the balance passage means for introducing an air charge to the crankcase chambers.
Claim 19
Dependent Claim
29 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 11 further including control valve means for controlling the flow through each of said communicating conduits.
Claim 20
Dependent Claim
46 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 16 wherein there are provided means for operating the control valve means for opening the control valve means at low and mid range loads and closing the control valve means at higher loads.
Claim 21
Dependent Claim
31 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 17 further including means independent of the balance passage for introducing an air charge to the crankcase chambers.
Claim 22
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 17 wherein the engine operates on a diesel cycle and fuel is injected into the combustion chambers for combustion.
Claim 23
Dependent Claim
32 words
A two cycle, crankcase compression, internal combustion engine as set forth in claim 19 further including means independent of the balance passage means for introducing an air charge to the crankcase chambers.
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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) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |