| 摘要 |
PROBLEM TO BE SOLVED: To enhance durability and the degree of selection freedom of an actuator which drives an impulse valve comprising a ball valve for opening/closing an intake passage of an engine. SOLUTION: In this intake control device, a valve body 42 of the impulse valve 32 has two first seal faces 46a. Since the valve body 42 is intermittently rotated in one direction by an actuator 55 to alternately seat the two first seal faces 46a on a second seal face 51a of a seat ring 51, a degree of selection freedom of the actuator 55 and durability can be enhanced, compared with a case where a valve body is reciprocated and rotated by a reciprocating rotation type actuator. In addition, although the valve body 42 has the two first seal faces 46a, the seat ring 51 has the one second seal face 51a. Therefore, when any one of the first seal faces 46a is seated on the second seal face 51a, variation of supercharging effects can be avoided by preventing change of the volume of the intake passage in the downstream side from the second seal face 51a on which the one first seal face 46a is seated. COPYRIGHT: (C)2007,JPO&INPIT
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