Throttle valves having spherical shaped edges

A throttle comprising:

• a throttle valve having a rotational axis and an outer peripheral edge,
• a throttle body having a longitudinal axis, and a bore defined within the throttle body, wherein the throttle valve is rotatably disposed within the bore about the rotational axis, such that the amount of air flow through the bore varies in response to the rotational position of the throttle valve with respect to the bore;
• wherein the peripheral edge of the throttle valve includes a spherical curved portion having a radius of curvature with respect to a point on the rotational axis, and a cylindrical curved portion having a radius of curvature with respect to the rotational axis, and
• wherein the spherical curved portion and the cylindrical curved portion are formed on one side and the other side in the thickness direction of the throttle valve, respectively.

A throttle comprising:

• a throttle body,
• a bore defined within the throttle body, wherein a longitudinal axis is defined within the bore and the bore serves as an air flow channel,
• a throttle shaft extending across the air flow channel and being rotatably supported by the throttle body about a rotational axis;
• a throttle valve affixed to the throttle shaft and being arranged and constructed to open and close the air flow channel by rotating the throttle shaft and the throttle valve within the bore, the throttle valve being further arranged and constructed such that the throttle valve extends substantially perpendicular to the longitudinal axis of the bore when the throttle valve is disposed in a fully closed position with respect to the bore, and wherein a clearance is defined between a peripheral edge of the throttle valve and an inner wall of the bore when the throttle valve is disposed in the fully closed position,
• a stopper disposed on the throttle body in a position outside of the air flow channel, and
• a lever coupled to the throttle shaft and being arranged and constructed to contact the stopper when the throttle valve is disposed in the fully closed position,
• wherein the peripheral edge of the throttle valve includes a spherical curved portion having a radius of curvature with respect to a point on the rotational axis, and a cylindrical curved portion having a radius of curvature with respect to the rotational axis, and
• wherein the spherical curved portion and the cylindrical curved portion are formed on one side and the other side in the thickness direction of the throttle valve, respectively.