US5239950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-cycle engine
Assignee: SAKSHIN KOGYO KK
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Filing: 1992-10-26
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Granted: 1993-08-31
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Expires: 2012-10-26
Abstract
Abstract A number of embodiments of outboard motors embodying pressure scavenged 2-cycle internal combustion engines. In each embodiment, a plenum chamber serves the scavenge passages of the engine and the pressure relief for a scavenge pump is provided by a pressure relief valve in the plenum chamber so as to reduce the opening and closing of the pressure relief valve due to pulsations caused by the engine operation. In one embodiment, the pressure is relieved by discharging the air to the exhaust system for silencing and also for cooling the exhaust gases. In other embodiments, the air for pressure relief is discharged to the atmosphere.
Inventors
- 👤 Masanori Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:38
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/05; F01N1/00; F01N1/14; F02; F02B; F02B33/00; F02B33/32; F02B33/34; F02B33/36; F02B33/38; F02B33/44; F02B33/443; F01N2270/00; F01N2270/02; F01N2270/06; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B61/00; F02B61/04; F02B61/045; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
93 words
An internal combustion engine comprising a combustion chamber defined by at least a pair of relatively moveable components, a scavenging port communicating with said combustion chamber and opened and closed by the relative movement of said components, a plenum chamber communicating with said scavenge port, an air compressor for receiving atmospheric air and delivering a compressed charge to said plenum chamber for admission to said combustion chamber upon opening and closing of said scavenge port, and a pressure relief valve in said plenum chamber for limiting the maximum pressure in said plenum chamber.
Claim 2
Dependent Claim
93 words
An internal combustion engine comprising a combustion chamber defined by at least a pair of relatively moveable components, a scavenging port communicating with said combustion chamber and opened and closed by the relative movement of said components, a plenum chamber communicating with said scavenge port, an air compressor for receiving atmospheric air and delivering a compressed charge to said plenum chamber for admission to said combustion chamber upon opening and closing of said scavenge port, and a pressure relief valve in said plenum chamber for limiting the maximum pressure in said plenum chamber.
Claim 3
Dependent Claim
26 words
An internal combustion engine as set forth in claim 1 wherein the engine comprises a reciprocative engine and the components comprise a cylinder and a piston.
Claim 4
Dependent Claim
21 words
An internal combustion engine as set forth in claim 2 wherein the plenum chamber surrounds at least in part the cylinder.
Claim 5
Dependent Claim
56 words
An internal combustion engine as set forth in claim 3 wherein the engine has multiple combustion chambers and multiple scavenge ports, each combustion chamber being formed by a respective cylinder and a plenum chamber serves all of the scavenge ports and wherein the air compressor supplies air to the plenum chamber through a common inlet opening.
Claim 6
Dependent Claim
29 words
An internal combustion engine as set forth in claim 4 wherein the pressure relief valve is positioned at a place in the plenum chamber spaced from the inlet opening.
Claim 7
Dependent Claim
20 words
An internal combustion engine as set forth in claim 4 wherein there is a common plenum chamber for all cylinders.
Claim 8
Dependent Claim
29 words
An internal combustion engine as set forth in claim 6 wherein the pressure relief valve is positioned at a place in the plenum chamber spaced from the inlet opening.
Claim 9
Dependent Claim
39 words
An internal combustion engine as set forth in claim 1 further including an exhaust port for discharging exhaust gases from the combustion chamber and an exhaust system for discharging the exhaust gases from the exhaust port to the atmosphere.
Claim 10
Dependent Claim
24 words
An internal combustion engine as set forth in claim 8 wherein the pressure relief valve relieves pressure by discharging air into the exhaust system.
Claim 11
Dependent Claim
23 words
An internal combustion engine as set forth in claim 8 wherein the pressure relief valve relieves pressure by discharging air to the atmosphere.
Claim 12
Dependent Claim
24 words
An internal combustion engine as set forth in claim 1 wherein the engine forms a portion of the power head of an outboard motor.
Claim 13
Dependent Claim
26 words
An internal combustion engine as set forth in claim 11 wherein the engine comprises a reciprocative engine and the components comprise a cylinder and a piston.
Claim 14
Dependent Claim
21 words
An internal combustion engine as set forth in claim 12 wherein the plenum chamber surrounds at least in part the cylinder.
Claim 15
Dependent Claim
57 words
An internal combustion engine as set forth in claim 13 wherein the engine has multiple combustion chambers and multiple scavenge ports each combustion chamber being formed by a respective cylinder and wherein a plenum chamber serves all of the scavenge ports and wherein the air compressor supplies air to the plenum chamber through a common inlet opening.
Claim 16
Dependent Claim
29 words
An internal combustion engine as set forth in claim 14 wherein the pressure relief valve is positioned at a place in the plenum chamber spaced from the inlet opening.
Claim 17
Dependent Claim
20 words
An internal combustion engine as set forth in claim 14 wherein there is a common plenum chamber for all cylinders.
Claim 18
Dependent Claim
29 words
An internal combustion engine as set forth in claim 16 wherein the pressure relief valve is positioned at a place in the plenum chamber spaced from the inlet opening.
Claim 19
Dependent Claim
39 words
An internal combustion engine as set forth in claim 11 further including an exhaust port for discharging exhaust gases from the combustion chamber and an exhaust system for discharging the exhaust gases from the exhaust port to the atmosphere.
Claim 20
Dependent Claim
24 words
An internal combustion engine as set forth in claim 18 wherein the pressure relief valve relieves pressure by discharging air into the exhaust system.
Claim 21
Dependent Claim
40 words
An internal combustion engine as set forth in claim 19 wherein the outboard motor further includes a driveshaft housing defining an expansion chamber which forms a portion of the exhaust system and the air is discharged into the expansion chamber.
Claim 22
Dependent Claim
23 words
An internal combustion engine as set forth in claim 18 wherein the pressure relief valve relieves pressure by discharging air to the atmosphere.
Claim 23
Dependent Claim
37 words
An internal combustion engine as set forth in claim 21 wherein the power head further includes a protective cowling surrounding the engine and wherein the pressure relief valve discharges air into the interior of the protective cowling.
Claim 24
Dependent Claim
49 words
An internal combustion engine as set forth in claim 21 wherein the power head further includes a protective cowling surrounding the internal combustion engine and the relief valve communicates with the atmosphere through a conduit extending within the protective cowling to a discharge opening formed in the protective cowling.
Claim 25
Dependent Claim
99 words
An internal combustion engine comprising a combustion chamber defined by at least a pair of relatively moveable components, and intake port communicating with said combustion chamber, an air compressor for delivering a compressed air charge to said intake port, an exhaust port for discharging exhaust gases from said combustion chamber, an exhaust system for receiving exhaust gases from said exhaust port and discharging them to the atmosphere, a pressure relief valve for relieving the pressure in said intake port, and means for communicating the air relieved from said intake port by said pressure relief valve to said exhaust system.
Claim 26
Dependent Claim
99 words
An internal combustion engine comprising a combustion chamber defined by at least a pair of relatively moveable components, and intake port communicating with said combustion chamber, an air compressor for delivering a compressed air charge to said intake port, an exhaust port for discharging exhaust gases from said combustion chamber, an exhaust system for receiving exhaust gases from said exhaust port and discharging them to the atmosphere, a pressure relief valve for relieving the pressure in said intake port, and means for communicating the air relieved from said intake port by said pressure relief valve to said exhaust system.
Claim 27
Dependent Claim
26 words
An internal combustion engine as set forth in claim 24 wherein the engine comprises a reciprocative engine and the components comprise a cylinder and a piston.
Claim 28
Dependent Claim
30 words
An internal combustion engine as set forth in claim 25 wherein a plenum chamber surrounds at least in part the cylinder and the supercharger delivers air to the penum chamber.
Claim 29
Dependent Claim
57 words
An internal combustion engine as set forth in claim 26 wherein the engine has multiple combustion chambers and multiple intake ports, each combustion chamber being formed by a respective cylinder and wherein a common plenum chamber serves all of the intake ports and wherein the air compressor supplies air to the plenum chamber through a common opening.
Claim 30
Dependent Claim
24 words
An internal combustion engine as set forth in claim 24 wherein the engine forms a portion of the power head of an outboard motor.
Claim 31
Dependent Claim
26 words
An internal combustion engine as set forth in claim 28 wherein the engine comprises a reciprocative engine and the components comprise a cylinder and a piston.
Claim 32
Dependent Claim
40 words
An internal combustion engine as set forth in claim 28 wherein the outboard motor further includes a driveshaft housing defining an expansion chamber which forms a portion of the exhaust system and the air is discharged into the expansion chamber.
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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) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |