| 摘要 |
<p>The invention provides an air bypass apparatus which can accurately supply an idle air amount without being affected by pulsative pressure generated within an intake passage in a state that an opening degree of an air control valve is fixed. An air control hole (13) is open at a side wall (12a) of a valve body guide hole (12) formed in an air control valve main body (10), and an air inflow hole (17) is open at a bottom portion. An air control valve (21) is formed in a closed-end tubular shape with a bottom portion (21a) and a tube portion (21b), and arranged on an outer periphery of a shaft portion (20b) of a slider (20), and a lower end surface (21a2) of the bottom portion (21a) is arranged in a contact manner via a closing member (1) toward a locking piece portion (2) fixedly arranged on an end portion of the shaft portion (20b) . An annular gap (S2) formed by an inner periphery (21a1) of the bottom portion (21a) of the air control valve (21) and an outer periphery (20d) of the shaft portion (20b) is closed by the closing member (1) arranged in a contact manner on the lower end surface (21a2) of the bottom portion (21a), and cuts off communication between a space portion (25), which is formed between an inner side of the tube portion (21b) of the air control valve (21) and an outer periphery of the shaft portion (20b) of the slider (20), and a lower chamber (12g) of a valve body guide hole facing to the bottom portion (21a) of the air control valve (21).
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