US4907549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scavenging system for a two-stroke-cycle engine
Assignee: Subaru Corp
•
Filing: 1989-04-20
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Granted: 1990-03-13
•
Expires: 2009-04-20
Abstract
Abstract A two-stroke engine has a scavenge pump provided in an intake passage. A continuously variable transmission is operatively connected between the scavenge pump and a crankshaft of the engine for operating the scavenge pump. An actuator is provided for changing the transmission ratio of the transmission. The actuator is operated by a controller so as to control the speed of the transmission ratio in accordance with load on the engine.
Inventors
- 👤 Koji Morikawa
- 👤 Hideo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:08
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/44; F02B33/446; F02B25/00; F02B25/20; F02B39/00; F02B39/02; F02B39/04; F02B39/16; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02D41/24; F02D41/2406; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2275/00; F02B2275/14; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A system for scavenging for a two-stroke engine having at least one cylinder, a scavenge port, an exhaust port, an intake passage communicated with said scavenge port, an exhaust passage communicated with said exhaust port, a fuel injector, and a scavenge pump provided in said intake passage, the system comprising: a transmission ratio changing means operatively connecting said scavenge pump and a crankshaft of said engine for operating said scavenge pump; an actuator for changing the transmission ratio of said transmission; sensing means for detecting load on said engine and for producing a load signal; and control means responsive to said load signal for operating said actuator so as to control increasing speed of said transmission ratio in accordance with the load.
Claim 2
Independent Claim
122 words
A system for scavenging for a two-stroke engine having at least one cylinder, a scavenge port, an exhaust port, an intake passage communicated with said scavenge port, an exhaust passage communicated with said exhaust port, a fuel injector, and a scavenge pump provided in said intake passage, the system comprising: a transmission ratio changing means operatively connecting said scavenge pump and a crankshaft of said engine for operating said scavenge pump; an actuator for changing the transmission ratio of said transmission; sensing means for detecting load on said engine and for producing a load signal; and control means responsive to said load signal for operating said actuator so as to control increasing speed of said transmission ratio in accordance with the load.
Claim 3
Dependent Claim
21 words
The system according to claim 1, wherein said control means is provided for increasing said ratio with increase of the load.
Claim 4
Dependent Claim
17 words
The system according to claim 1, wherein said transmission ratio changing means is a continuously variable transmission.
Claim 5
Dependent Claim
15 words
The system according to claim 1, wherein said fuel injector is provided in said cylinder.
Claim 6
Dependent Claim
16 words
The system according to claim 1, wherein said fuel injector is provided in said scavenge port.
Claim 7
Dependent Claim
22 words
The system according to claim 1, further comprising a throttle valve provided in said intake passage at upstream of said scavenge pump.
Claim 8
Dependent Claim
20 words
The system according to claim 1, further comprising a throttle valve provided in a bypass provided around said scavenge pump.
Claim 9
Dependent Claim
34 words
The system according to claim 1, further comprising an exhaust valve provided in said exhaust passage, driving means operatively connecting said exhaust valve with a crankshaft of said engine for operating said exhaust valve.
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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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |