Internal-combustion engines – Multiple cylinder – Cylinders in-line
Patent
1991-09-17
1993-03-09
Okonsky, David A.
Internal-combustion engines
Multiple cylinder
Cylinders in-line
123 65VA, 123 78A, 123 51B, F02B 7520
Patent
active
051918633
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an internal combustion engine. More particularly, the present invention relates to an internal combustion engine having a rotary sleeve valve mechanism with a sleeve valve which is formed with an opening in the outer peripheral surface for suction of fuel and discharge of exhaust gas.
2. Background Art
In an internal combustion engine of the type in which a piston performs reciprocating motion, a mixture of fuel and air is sucked into a cylinder chamber from an inlet valve and this mixture is compressed and explosively burned, and the exhaust gas after the explosive combustion is discharged from an exhaust valve by moving the piston in the cylinder.
In the meantime, valve mechanisms for admission and exhaust of the fuel mixture may be roughly divided into three, that is, poppet valve mechanism, sleeve valve mechanism, and rotary valve mechanism. The poppet valve mechanism, which is widely used in internal combustion engines, comprises generally a valve gear and a driving gear therefor. The valve gear has a cam for controlling the opening and closing of the valve, a transmission mechanism for transmitting the motion of the cam, and a mechanism for converting the cam motion into motion for opening and closing the valve. The driving gear is a mechanism for driving the cam shaft in synchronism with the rotation of the crankshaft.
At present, several different types of poppet valve mechanism are commercially employed depending on the performance characteristics of the engine, the configuration of the combustion chamber, the readiness of maintenance, the production cost, etc. These poppet valve mechanisms may be roughly divided into the side-valve type that is mainly employed in general-purpose engines and the overhead-valve type that is employed in automotive engines and the like. The driving gear employs gear drive, chain drive, or timing belt drive. The sleeve valve mechanism is arranged such that a sleeve which is fitted to the inner surface of a cylinder is driven to move up and down or to rotate, thereby opening and closing inlet and exhaust ports.
The rotary valve is a mechanism in which a rotor is provided in a part of the inlet/exhaust passage or the combustion chamber and this rotor is rotated to provide communication with the inlet and exhaust ports. Sleeve valves include a rotary sleeve valve in which a sleeve is rotated to open and close the inlet and exhaust ports, as disclosed, for example, in Japanese Registered Utility Model Publication No. 368237 (JP, Z2, 36823) and Japanese Utility Model Application Post-Exam Publication No. 25-5704 (JP, Y1, 25-5704). Internal combustion engines that employ such sleeve valves have advantages: high ventilation efficiency for admission and exhaust owing to a relatively large valve bore area; relatively simple valve mechanism; and less noise.
However, no sleeve-valve type internal combustion engine is presently put to practical use except for special use application from the viewpoint of the difficulty in maintaining the air tightness between the sleeve and the cylinder block, the difficulty in lubricating the rotational contact surfaces, the frictional loss, etc. The above-described sleeve valve-type internal combustion engine is an art in the past and suffered from the problem that it was impossible to increase the compression ratio to a high level since it was impossible to completely prevent gas leakage and effect the required lubrication with the level of sealing technique at the time of development of the art.
DISCLOSURE OF THE INVENTION
The present invention, which has been made with the above-described technical background, attains the following objects.
It is an object of the present invention to provide a novel rotary sleeve-valve internal combustion engine which has neither inlet nor exhaust valve.
It is another object of the present invention to provide a rotary sleeve-valve internal combustion engine having a structure which is designed so that the admission and exhaust efficiency is
REFERENCES:
patent: 1073640 (1913-09-01), Smith
patent: 1121682 (1914-12-01), Snell
patent: 1172940 (1916-02-01), Cleaver
patent: 1838308 (1931-12-01), Higman
patent: 2781748 (1957-02-01), Stucke
patent: 2855912 (1958-10-01), Stucke
patent: 2982272 (1961-05-01), Stucke
patent: 5081963 (1992-01-01), Galbraith
Abstract of Japanese Publication No. 56-159519; Date: Dec. 8, 1981; Title: Engine with Two Piston in One Cylinder.
Abstract of Japanese Publication No. 62-265411; Date: Nove. 18, 1987; Title: Rotary Valve Type Four Cycle Engine.
Okonsky David A.
Oshima Construction Co., Ltd.
LandOfFree
Rotary sleeve-valve internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotary sleeve-valve internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary sleeve-valve internal combustion engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-204896