US5878703A
Expired / Lapsed
US
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Two stroke cycle engine
Assignee: Individual
•
Filing: 1997-05-30
•
Granted: 1999-03-09
•
Expires: 2017-05-30
Abstract
Abstract An improved two stroke cycle engine is disclosed. The engine has an intake port for passing air into a cylinder of the engine and has a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position. The engine includes a crankcase, an intake valve in a wall of the crankcase, a plenum chamber for supplying air to the intake port and an output valve positioned between the crankcase and the plenum chamber. The engine also includes an air compressor and an air compressor valve positioned between the air compressor and the plenum chamber. The engine has a first mode of operation during startup wherein the piston draws air into the crankcase through the intake valve and then forces air from the crankcase, through the output valve, into the plenum chamber and to the intake port. The engine has a second mode of operation during which the engine is running wherein the air compressor forces air through the air compressor valve, into the plenum chamber and to the intake port. A two stroke cycle engine having a plurality of cylinders, cylinder heads and the upper portion of the crankcase formed from the same material is also disclosed. Other kits and methods of practicing the invention are also disclosed.
Inventors
- 👤 Kevin Sweeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:34
CPC Classifications
F; F02; F02B; F02B25/00; F02B25/14; F02B29/00; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/1804; F02B2075/1816; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
193 words
A two stroke cycle engine having an intake port for passing air into a cylinder of the engine, the engine having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine comprising: a crankcase; an intake valve in a wall of the crankcase; a plenum chamber for supplying air to the intake port; an output valve positioned between the crankcase and the plenum chamber; an air compressor; and an air compressor valve positioned between the air compressor and the plenum chamber; wherein the engine has a first mode of operation during startup wherein the piston draws air into the crankcase through the intake valve as the piston moves towards its top dead center position and wherein the piston forces air from the crankcase, through the output valve, into the plenum chamber and to the intake port as the piston moves towards its bottom dead center postion; wherein the engine has a second mode of operation during which the engine is running wherein the air compressor forces air through the air compressor valve, into the plenum chamber and to the intake port.
Claim 2
Dependent Claim
193 words
A two stroke cycle engine having an intake port for passing air into a cylinder of the engine, the engine having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine comprising: a crankcase; an intake valve in a wall of the crankcase; a plenum chamber for supplying air to the intake port; an output valve positioned between the crankcase and the plenum chamber; an air compressor; and an air compressor valve positioned between the air compressor and the plenum chamber; wherein the engine has a first mode of operation during startup wherein the piston draws air into the crankcase through the intake valve as the piston moves towards its top dead center position and wherein the piston forces air from the crankcase, through the output valve, into the plenum chamber and to the intake port as the piston moves towards its bottom dead center postion; wherein the engine has a second mode of operation during which the engine is running wherein the air compressor forces air through the air compressor valve, into the plenum chamber and to the intake port.
Claim 3
Dependent Claim
28 words
The engine of claim 1 comprising a plurality of cylinders in a V formation and wherein the plenum chamber is positioned within the V formation between the cylinders.
Claim 4
Dependent Claim
75 words
The engine of claim 1: wherein the crankcase comprises a first crankcase chamber and a second crankcase chamber; wherein the cylinder comprises a first cylinder coupled to the first crankcase chamber and a second cylinder coupled to the second crankcase chamber; wherein the output valve comprises a first output valve positioned between the first crankcase chamber and the plenum chamber, and a second output valve positioned between the second crankcase chamber and the plenum chamber.
Claim 5
Dependent Claim
19 words
The engine of claim 1 wherein the intake valve and the output valve each comprise a one way valve.
Claim 6
Dependent Claim
18 words
The engine of claim 1 wherein the intake valve and the output valve each comprise a reed valve.
Claim 7
Dependent Claim
12 words
The engine of claim 1 wherein the air compressor comprises a turbocharger.
Claim 8
Dependent Claim
12 words
The engine of claim 1 wherein the air compressor comprises a supercharger.
Claim 9
Dependent Claim
202 words
A kit for retrofitting a two stroke cycle engine to allow the engine to startup without use of a startup air compressor, the engine having an intake port for passing air into a cylinder of the engine and having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine further having a run-time air compressor and a plenum chamber for supplying air from the air compressor to the intake port, the engine also having a crankcase, the kit comprising: an intake valve adapted for use in a wall of the crankcase to allow air to pass into the crankcase during startup of the engine as the piston moves towards its top dead center position; an output valve adapted for use between the crankcase and the plenum chamber to allow air to pass from the crankcase into the plenum chamber during startup of the engine as the piston moves towards its bottom dead center position; and an air compressor valve adapted for use between the run-time air compressor and the plenum chamber to allow air to pass from the run-time air compressor into the plenum chamber while the engine is running.
Claim 10
Dependent Claim
202 words
A kit for retrofitting a two stroke cycle engine to allow the engine to startup without use of a startup air compressor, the engine having an intake port for passing air into a cylinder of the engine and having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine further having a run-time air compressor and a plenum chamber for supplying air from the air compressor to the intake port, the engine also having a crankcase, the kit comprising: an intake valve adapted for use in a wall of the crankcase to allow air to pass into the crankcase during startup of the engine as the piston moves towards its top dead center position; an output valve adapted for use between the crankcase and the plenum chamber to allow air to pass from the crankcase into the plenum chamber during startup of the engine as the piston moves towards its bottom dead center position; and an air compressor valve adapted for use between the run-time air compressor and the plenum chamber to allow air to pass from the run-time air compressor into the plenum chamber while the engine is running.
Claim 11
Dependent Claim
19 words
The engine of claim 8 wherein the intake valve and the output valve each comprise a one way valve.
Claim 12
Dependent Claim
18 words
The engine of claim 8 wherein the intake valve and the output valve each comprise a reed valve.
Claim 13
Dependent Claim
99 words
A two stroke cycle engine having an intake port for passing air into a cylinder of the engine, the engine having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine comprising: a crankcase; a one way intake valve in a wall of the crankcase; a plenum chamber for supplying air to the intake port; a one way output valve positioned between the crankcase and the plenum chamber; an air compressor; and a one way air compressor valve positioned between the air compressor and the plenum chamber.
Claim 14
Dependent Claim
99 words
A two stroke cycle engine having an intake port for passing air into a cylinder of the engine, the engine having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine comprising: a crankcase; a one way intake valve in a wall of the crankcase; a plenum chamber for supplying air to the intake port; a one way output valve positioned between the crankcase and the plenum chamber; an air compressor; and a one way air compressor valve positioned between the air compressor and the plenum chamber.
Claim 15
Dependent Claim
28 words
The engine of claim 11 wherein the one way intake valve, the one way output valve and the one way air compressor valve each comprise a reed valve.
Claim 16
Dependent Claim
12 words
The engine of claim 11 wherein the air compressor comprises a turbocharger.
Claim 17
Dependent Claim
12 words
The engine of claim 11 wherein the air compressor comprises a supercharger.
Claim 18
Independent Claim
199 words
A method of retrofitting a two stroke cycle engine to allow the engine to startup without use of a startup air compressor, the engine having an intake port for passing air into a cylinder of the engine and having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine further having a run-time air compressor and a plenum chamber for supplying air from the air compressor to the intake port, the engine also having a crankcase, the method comprising the steps of: providing an intake valve in a wall of the crankcase to allow air to pass into the crankcase during startup of the engine as the piston moves towards its top dead center position; providing an output valve between the crankcase and the plenum chamber to allow air to pass from the crankcase into the plenum chamber during startup of the engine as the piston moves towards its bottom dead center position; and providing an air compressor valve between the run-time air compressor and the plenum chamber to allow air to pass from the run-time air compressor into the plenum chamber while the engine is running.
Claim 19
Independent Claim
199 words
A method of retrofitting a two stroke cycle engine to allow the engine to startup without use of a startup air compressor, the engine having an intake port for passing air into a cylinder of the engine and having a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position, the engine further having a run-time air compressor and a plenum chamber for supplying air from the air compressor to the intake port, the engine also having a crankcase, the method comprising the steps of: providing an intake valve in a wall of the crankcase to allow air to pass into the crankcase during startup of the engine as the piston moves towards its top dead center position; providing an output valve between the crankcase and the plenum chamber to allow air to pass from the crankcase into the plenum chamber during startup of the engine as the piston moves towards its bottom dead center position; and providing an air compressor valve between the run-time air compressor and the plenum chamber to allow air to pass from the run-time air compressor into the plenum chamber while the engine is running.
References Cited (Backward Citations)
US3036561A
Cited
US3540421A
Cited
US3680305A
Cited
US4162662A
Cited
US4399778A
Cited
US4480968A
Cited
US4539948A
Cited
US4781028A
Cited
US4864979A
Cited
US4995349A
Cited
US4860699A
Cited
US5005537A
Cited
US5088285A
Cited
US5448971A
Cited
US5251581A
Cited
US5307792A
Cited
US5101794A
Cited
US5239950A
Cited
US5419289A
Cited
US5370087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-08 | 2002-09-07 | 2003-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-08 | 2006-09-07 | 2007-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-08 | 2010-09-07 | 2011-03-09 | $7700.00 | Window Closed / Lapsed |