Patent US3368428A successfully refreshed from Google Patents.
US5379732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously variable volume scavenging passage for two-stroke engines
Assignee: Individual
•
Filing: 1993-11-12
•
Granted: 1995-01-10
•
Expires: 2013-11-12
Abstract
Abstract A variable volume transfer duct for maintaining an optimum volume of buffer gas in the transfer duct of a two-stroke engine during operation in order to minimize short circuit loss of fresh charge at all load levels during engine operation. The variable volume transfer duct that has two pieces, a top and a bottom duct wherein the bottom duct is aligned with and slidably disposed within the upper duct. Control means are provided for raising and lowering of the bottom duct to vary the transfer duct volume accordingly. A control means controls recirculates exhaust gas, or the secondary air, as buffer gas that fills the top of the transfer passage and regulates the buffer gas according to engine load conditions such that it provides a larger amount at higher loads and a lesser quantity at lighter loads.
Inventors
- 👤 Nagesh S. Mavinahally
- 👤 Pushpalatha S. Mavinahally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:14
CPC Classifications
F; F02; F02B; F02B25/00; F02B25/20; F02B25/22; F01; F01P; F01P1/00; F01P1/04; F02F; F02F1/00; F02F1/18; F02F1/22; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02D; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/0291
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A two-stroke internal combustion engine having a transfer passage which comprises a first duct and a second duct, the length of the transfer passage being variable, by a control means which cause the first duct to slide inside the second duct, in order to vary the volume of the transfer duct according to operating conditions of the engine.
Claim 2
Dependent Claim
58 words
A two-stroke internal combustion engine having a transfer passage which comprises a first duct and a second duct, the length of the transfer passage being variable, by a control means which cause the first duct to slide inside the second duct, in order to vary the volume of the transfer duct according to operating conditions of the engine.
Claim 3
Dependent Claim
27 words
The engine according to claim 1 further comprising a means to flow buffer gas into said ducts wherein said buffer gas is exhaust gas from the engine.
Claim 4
Dependent Claim
24 words
The engine according to claim 1 further comprising a means to flow buffer gas into said ducts wherein said buffer gas is fresh air.
Claim 5
Dependent Claim
26 words
The engine according to claim 1 wherein said control means is operable to vary the volume of the transfer duct according to an engine load condition.
Claim 6
Dependent Claim
41 words
The engine according to claim 1 wherein said first duct is a lower duct and said second duct is an upper duct and said engine further comprises a means to induct buffer gas into a top entrance of said transfer passage.
Claim 7
Dependent Claim
25 words
The engine according to claim 5 wherein said control means includes a means to induct buffer gas into said transfer passage through piston controlled ports.
Claim 8
Dependent Claim
23 words
The engine according to claim 5 wherein said control means includes a valve means to regulate buffer gas inducted into said transfer passage.
Claim 9
Dependent Claim
40 words
The engine according to claim 1 further comprising a rack and pinion actuation means to slide said first duct within said second duct, said actuation means having a rack attached to said first duct and a pinion engaging said rack.
Claim 10
Dependent Claim
85 words
The engine according to claim 8 wherein said actuation means further comprises a geared rack on an outer surface of said first duct, said pinion is generally disposed outside of a cylinder block of the engine and engages said rack through a window in said cylinder block, and said pinion is rotatable against a spring and operably linked through suitable linkages to an actuator which is operable to apply a force to said linkages in order to slide said first duct within said second duct.
Claim 11
Dependent Claim
47 words
The engine according to claim 4 wherein said control means is operable to regulate the buffer gas according to engine load conditions such that it provides a larger amount of buffer gas at higher engine loads and a lesser quantity of buffer gas at lighter engine loads.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |