Air induction noise of a throttle apparatus caused by interference between flowing air and an opening for a bypass passage is reduced because a protrusion formed on an interior surface of the throttle apparatus changes aerodynamic features of the throttle apparatus.
Air induction noise of a throttle apparatus caused by interference between flowing air and an opening for a bypass passage is reduced because a protrusion formed on an interior surface of the throttle apparatus changes aerodynamic features of the throttle apparatus.
An oil control valve is provided that comprises a housing, a spool movably disposed inside the housing, and a damping unit disposed between a distal end of the spool and an end wall of the housing such that an impact generated by a collision of the spool at the end of its travel decreases.
An oil control valve is provided that comprises a housing, a spool movably disposed inside the housing, and a damping unit disposed between a distal end of the spool and an end wall of the housing such that an impact generated by a collision of the spool at the end of its travel decreases.