Internal-combustion engines – Two-cycle – Separate air and gas pumps
Reexamination Certificate
1998-09-25
2001-01-09
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Two-cycle
Separate air and gas pumps
C123S0650WA, C123S0650BA, C123S0650PD
Reexamination Certificate
active
06170444
ABSTRACT:
TECHNICAL FIELD
This invention relates to a two-cycle internal combustion engine, and in particular, to an improved combustion air supply and exhaust gas discharge system for same.
BACKGROUND ART
A major problem in the two-cycle engine is the process of purging the exhaust gases and, during the same stroke, providing combustion air. This process of purging the exhaust gases is commonly referred to as “scavenging”. Although fuel injection systems mitigate this problem to some extent, proper scavenging is indispensable for achieving high efficiency and low exhaust emissions.
DISCLOSURE OF INVENTION
In view of the above, it is an object of the invention to provide an air supply and exhaust gas management (scavenging) system for two-cycle internal combustion engines, which allows such engines to perform comparably to similar four-cycle engines, while remaining lighter, simpler and more cost-effective than their four-cycle counterparts.
It is a further object of the invention to provide specific features of such a system, including particular system components and component configurations.
In the invention, scavenging is achieved by locating at least one and preferably a number of air intake valves in the head of each cylinder, and at least one and preferably a number of exhaust gas discharge openings in the lower cylinder walls. The air intake valves are controlled solely by air pressure differentials, generated by fluctuating pressure inside the cylinder on one side and in the air supply chamber on the other side. When the piston rim clears the exhaust openings on its dowstroke, pressure in the cylinder decreases below the pressure in the air supply chamber, causing the air intake valves to open and allow scavenging air in. A scavenging blower is used to force air into the air supply chamber and thence through the valves, in order to more effectively purge the exhaust gases form the cylinder as the piston descends. This arrangement can operate in an internal combustion engine utilizing either the Diesel or Otto processes.
The preferred embodiment of the invention is aimed at providing an internal combustion engine with a potential power output of 100 HP to 300 HP, for example, using a modular engine design with, for example, 2, 3, 4, or 6 cylinders with displacements of 1.0 L to 3.0 L, as required. The invention is not limited to specific numbers or sizes of cylinders or specific power outputs, however.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
REFERENCES:
patent: 744881 (1903-11-01), Sohnlein
patent: 856790 (1907-06-01), Micklewood et al.
patent: 1329811 (1920-02-01), Smith
patent: 1716278 (1929-06-01), Muller
patent: 2189106 (1940-02-01), Garve et al.
patent: 2381646 (1945-08-01), Carter
patent: 5133309 (1992-07-01), Ishii
Armstrong R. Craig
McMahon Marguerite
LandOfFree
Air and exhaust gas management system for a two-cycle... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Air and exhaust gas management system for a two-cycle..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air and exhaust gas management system for a two-cycle... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2501872