Internal combustion engines

Details Internal combustion engines Internal combustion engines

1998-07-30

2001-02-20

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Pump draws exhaust gas from engine

C060S280000, C060S316000, C123S559100

Reexamination Certificate

active

06189318

ABSTRACT:

BACKGROUND OF THE INVENTION AND RELATED ART
The invention relates to internal combustion engines. The invention relates more particularly to the control of exhaust gases in such engines. In normal operation of a reciprocating internal combustion engine the exhaust gases are removed, after each compression stroke, by the sweep of a piston, during an exhaust stroke, through a cylinder to force burnt gases into an exhaust manifold and towards an exhsaust pipe.
U.S. Pat. No. 1,586,778 discloses a four stroke reciprocating piston internal combustion engine (7) having several cyliners with inlet and exhaust valves adjacent tops of the respective cylinders and an exhaust chamber (6) for collecting exhaust gases produced by the engine in use, said engine including a vacuum pump (B) for the exhaust chamber arranged to supply a vacuum to each cylinder when its exhaust valve is open to withdraw exhaust gases out of the cylinder. Vacuum is applied to the exhaust chamber to suck exhaust gases out of the cylinder, the piston is also positively sucked towards the top of the cylinder so that each exhaust stroke is also a power stroke.
To ensure an efficient scavenge, to remove as much of the burnt cases as possible, certain fairly significant overlaps between the opening and closing of inlet and exhaust valves in a top of the cylinder is necessary. Also, the scavenging stroke absorbs a certain amount of mechanical energy to reverse the forces applied to the piston tending at least to unbalance the engine.
It is an object of the invention to overcome or reduce these problems.
BRIEF SUMMARY OF THE INVENTION
According to the invention there is provided a reciprocating four-stroke internal combustion engine having one or more cylinders with inlet and outlet valves adjacent ends of respective cylinders and an exhaust chamber for collecting exhaust gases produced by the engine in use, including a vacuum pump for the exhaust chamber and a compressor for supplying fuel-air mixture to each cylinder, the vacuum pump being arranged to apply a vacuum to each cylinder when its exhaust valve is open to withdraw exhaust gases out of the cylinder and positively suck the piston of that cylinder towards the end of the cylinder, so that each exhaust stroke of the engine is also a power stroke, in which the compressor is arranged to apply pressure so that a fuel-air mixture is supplied to each cylinder under sufficient pressure when its inlet valve is open that each induction stroke is also a power stroke, and in which the valves are arranged to open and close without valve-overlap.
The vacuum pump is preferably mechanically connected to be driven by the engine.
The vacuum pump and compressor are preferably mounted in the same housing.
The compressor is preferably driven at a rate automatically varied by the operating speed of the engine.
The invention also provides an exhaust manifold vacuum pump for an internal combustion engine which is arranged to be driven by the engine and apply a vacuum to the or each cylinder of the engine whenever a respective exhaust valve is open at sufficient pressure to positively suck the piston of that cylinder towards the top of the cylinder, so that each exhaust stroke of the engine is also a power stroke.
A mechanical drive may also be provided connecting the engine to the pump arranged to operate the pump at a rate corresponding to the operating speed of the engine.
An internal combustion engine having an exhaust system arrangement according to the invention will now be described by way of example with reference to the accompanying schematic diagram.


REFERENCES:
patent: 937653 (1909-10-01), Sickenberger
patent: 1004564 (1911-10-01), Gaskill
patent: 1501041 (1924-07-01), Cutler
patent: 1586778 (1926-06-01), Brown
patent: 1632896 (1927-06-01), Herr
patent: 1730117 (1929-10-01), Brownrigg
patent: 2023403 (1935-10-01), Butler
patent: 2047928 (1936-07-01), Haring
patent: 2154322 (1939-04-01), Kammermann
patent: 59086 (1982-09-01), None
patent: 546256 (1922-11-01), None
patent: 584705 (1925-02-01), None
patent: 658891 (1929-06-01), None
patent: 856208 (1940-06-01), None
patent: 1534 (1911-01-01), None
patent: 491016 (1938-08-01), None
patent: 501471 (1939-03-01), None

Affiliated with

Also associated with

Rating

Internal combustion engines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Internal combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal combustion engines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2598475