Gas sealing system for rotary valves

Internal-combustion engines – Valve – Rotary

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Details

1231908, 12319017, F01L 700

Patent

active

055267807

ABSTRACT:
A rotary valve assembly for an internal combustion engine characterized in that the valve has a combination of axial sealing elements (21,22) and inner circumferential sealing elements (23,24) arranged to form a first seal pressurizing cavity extending circumferentially between the axial sealing elements (21,22) and two second seal pressurizing cavities each lying between the inner (23,24) and adjacent outer (25,26) circumferential sealing elements axially on each side of a window opening in a cylinder head (16) in which the valve rotates, the arrangement being such as to permit high pressure combustion gas to pass from the first cavity to the two second cavities whereby curing combustion the outer circumferential sealing elements (25,26) are caused to seal the second pressurizing cavities by being forced against the axially outermost sides of circumferentially extending grooves (36,37) in which they are located to prevent axially outward movement of gas, and the inner circumferential sealing elements (23,24) are caused to be loaded axially inwardly to seal against axially innermost sides of circumferentially extending grooves (34,35) in which they are located and to load the four circumferential sealing elements (23,24,25,26) radially to seal against a bore surface (19) in which the valve is housed and against which they are preloaded.

REFERENCES:
patent: 2211288 (1940-08-01), Oesch
patent: 4019487 (1977-04-01), Guenther
patent: 4467751 (1984-08-01), Asaka et al.
patent: 4852532 (1989-08-01), Bishop
patent: 5152259 (1992-10-01), Bell
patent: 5154147 (1992-10-01), Muroki

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