Exhaust gas control valve

An assembly for controlling a flow of exhaust gas from an engine, said assembly comprising:

• an exhaust gas manifold adapted to be coupled to the engine;
• and
• an exhaust gas control valve comprising,
• a housing having an interior wall defining a housing interior;
• a pinion gear coupled to said housing and configured to be rotatably driven;
• a helical gear configured to receive torque from said pinion gear, said helical gear including a plurality of helically arranged teeth;
• a valve member disposed at least partially in said housing interior of said housing, said valve member comprising a valve shaft extending along an axis and having a first shaft end and a second shaft end spaced from said first shaft end along said axis, and a valve body coupled to said valve shaft adjacent to said second shaft end and moveable with said valve shaft along said axis between a first valve position and a second valve position to regulate the flow of exhaust gas;
• and
• a motion converter configured to convert rotational motion of said helical gear to linear motion of said valve member,
• wherein said helical gear is further defined as a helical cam gear having a helical cam gear surface defining a central opening therethrough and having a cam feature extending away from said helical cam gear surface and disposed about said central opening.

An exhaust gas control valve for regulating a flow of exhaust gas, said exhaust gas control valve comprising:

• a housing having an interior wall defining a housing interior;
• a pinion gear coupled to said housing and configured to be rotatably driven;
• a helical gear configured to receive torque from said pinion gear, said helical gear including a plurality of helically arranged teeth;
• a valve member disposed at least partially in said housing interior of said housing, said valve member comprising a valve shaft extending along an axis and having a first shaft end and a second shaft end spaced from said first shaft end along said axis, and a valve body coupled to said valve shaft adjacent to said second shaft end and moveable with said valve shaft along said axis between a first valve position of said valve member and a second valve position of said valve member to regulate the flow of exhaust gas;
• a motion converter configured to convert rotational motion of said helical gear to linear motion of said valve member;
• and
• a shaft shield disposed about said valve shaft, wherein said shaft shield is further defined as a resilient shaft shield configured to resiliently engage said interior wall of said housing to limit the flow of exhaust gas toward said first shaft end of said valve shaft.