Internal-combustion engines – Valve – Rotary
Patent
1995-05-05
1996-04-02
Okonsky, David A.
Internal-combustion engines
Valve
Rotary
1231908, 1231902, 123 80BA, F01L 702
Patent
active
055031242
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to improvements in rotary valves for internal combustion engines.
The invention is applicable to rotary valves of the kind in which a valve is supported for rotation in a bore in a cylinder head by means of bearings that serve to maintain a small running clearance between the rotary valve and the bore, there being in the circumferential surface of the rotary valve one or more openings leading to a port or ports in the valve which, as the valve rotates are brought into coincidence with a window in the cylinder head leading to the combustion chamber of the engine. In such arrangements gas leakage from the combustion chamber in a circumferential direction around the valve is prevented by means of axially extending sealing members arranged in grooves in the cylinder head and spring loaded into contact with the circumferential surface of the rotary valve. Such axial seals are arranged on each side of the window in the cylinder head.
As is explained in greater detail in connection with the description of the specific embodiment of the invention, such axial seals can be subjected to sudden stresses of great magnitude during the rotation of the valve. The object of the present invention is to provide a means for substantially reducing the maximum bearing pressure on the axial seals.
The present invention consists of a rotary valve for an internal combustion engine comprising a hollow cylindrical valve, said valve having one or more ports terminating as openings in its periphery, said valve being supported for rotation in a cylinder head bore in which said valve rotates with a predetermined small clearance fit, said openings periodically passing over a window in said cylinder head bore, said window communicating with a combustion chamber, said valve being sealed against leakage of gas from the combustion chamber in a circumferential direction by means of axially extending seals at least one circumferentially on each side of said window, characterized in that the valve also incorporates at least one tongue projecting from the leading edge of at least one of the openings, the tongue extending from the edge of an opening to an extent sufficient to support radially one or more of the axially extending seals during that period when the leading edge of the opening crosses such seals .
In order that the nature of the invention may be better understood a preferred form thereof is hereinafter described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal cross-sectional view of a rotary valve to which the invention relates;
FIG. 2 is a sectional view on line A--A of FIG. 1;
FIG. 3 is a fragmentary sectional view of portion C in FIG. 2;
FIG. 4 is a sectional view on line B--B of FIG. 2;
FIG. 5 is a diagrammatic sectional view of the valve as the leading edge of the exhaust opening passes over an axial seal;
FIG. 6 is a diagrammatic view of an axial seal and the adjacent portion of the valve illustrating forces acting;
FIG. 7 is a view similar to FIG. 5 at a later stage in rotation of the valve;
FIG. 8 is a view similar to FIG. 6 illustrating the effect of the tongue provided by the invention;
FIG. 9 is a side view of the rotor showing the tongue provided by the present invention;
FIG. 10 is a sectional view on line D--D of FIG. 9; and
FIG. 11 is a diagram illustrating the annular extent of the tongue.
In the drawings rotary valve 10 is supported for rotation in bore 11 of cylinder head 12 by roller bearings 13 so that there is a very small clearance between the circumferential surface of valve 10 and bore 11. Exhaust opening 14 in valve 10 connecting to exhaust port 15 coincides once during each revolution of the valve with window 16 in cylinder head 12 leading to combustion chamber 17. In another portion of the revolution of valve 10, as specifically shown in FIGS. 1 and 2, inlet opening 14a, coincides with window 16 and hence communicates combustion chamber 17 to inlet port 15a.
Passage of gas from combustion chamber 17 along bore 11 in an axial dire
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patent: 5255645 (1993-10-01), Templeton
A. E. Bishop Research Pty. Limited
Okonsky David A.
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