| 摘要 |
A seal configuration for both reciprocating pistons and for rotating valves of internal combustion engines. A first embodiment, applicable to reciprocating pistons, provides minimum crevice volume (MCV). The MCV seal assembly according to the present invention, which replaces, at least, a conventional top piston ring and its annular groove, includes an annular groove in the piston, a wavy spring at the bottom of the annular groove and an MCV seal received in the annular groove and biased outwardly by the wavy spring, wherein the MCV seal assembly is configured and oriented so as to minimize the crevice volume above the MCV seal, wherein the spring biasing ensures an excellent sealing of the MCV seal to the cylinder wall. A second embodiment, applicable to rotary valves, particularly a variable orbital aperture (VOA) valve system, a plurality of VOA seal assemblies are provided, each including a groove, a wavy spring at the bottom of the groove and a VOA seal received in the groove and biased outwardly by the wavy spring so as to seal the orbiter relative to at least one of the upper head, lower head and the one or more floaters, and the seal the at least one floater relative to at least one of the upper head, the lower head and the orbiter. Each MCV seal and VOA seal is preferably coated with a low friction, high endurance coating, as for example metal oxides applied by a plasma gun.
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