Intake air amount control apparatus for an engine

An intake air amount control apparatus for an engine, comprising:

• a body having an intake passage formed therein;
• a shaft being disposed across said intake passage and rotatable with respect to said body;
• a valve fixedly mounted on said shaft for adjusting the degree of opening in said intake passage through a rotational angle thereof;
• a gear fixedly secured to said shaft for transmitting torque in a direction to open said valve from a drive motor to said shaft;
• and
• a torsion coil spring urging said valve in a direction to close said valve;
• wherein said torsion coil spring includes a first spring portion having a first end portion, a second spring portion having a second end portion, a joint portion that connects said first spring portion and said second spring portion with each other, and said first end portion of said first spring portion and said second end portion of said second spring portion are attached directly or indirectly to said body, with said joint portion being attached to said gear.