Patent ID: 6874466

Claim:
An intake valve device comprising: a throttle body defining a bore for the flow of intake air; a throttle shaft having a rotational axis and rotatably mounted to the throttle body; a slit formed in the throttle shaft in a diametrical direction and extending throughout the diameter of the throttle shaft; wherein the slit has opposing end walls spaced apart along the rotational axis of the throttle shaft at least as wide as the bore; a throttle valve having an outer periphery and arranged and constructed to be inserted into the slit of the throttle shaft; including at least one restriction portion; and wherein the throttle valve is fixed in position relative to the throttle shaft; and wherein a possible leakage channel is defined between the outer periphery of the throttle valve and the end wall of the slit; and wherein the at least one restriction portion extends into at least one of the possible leakage channels so as to narrow the possible leakage channel.