| 摘要 |
PROBLEM TO BE SOLVED: To reduce valve drive power for opening and closing an on/off-valve while preventing the deterioration of volume efficiency caused by the on/off-valve by improving the structure of the on/off-valve for changing over the passage length of an intake passage. SOLUTION: In an air intake device of an internal combustion engine, the on/off-valve 20 changing over the passage length of the intake passage 11 opens and closes a communication opening 15 making an intake chamber 10 communicate with an intermediate part of the intake passage 11. The communication opening 15 is formed by being surrounded by a peripheral part 16 formed with a chamber wall 12 of the intake chamber 10. The on/off-valve 20 is provided with a valve element 30, and a conversion mechanism 62 converting a valve-closing rotating force rotating the on/off-valve 20 in a valve-closing direction to a pressing force for pressing a rear-end seal part 35 of the valve element 30 against a rear edge 16b of the peripheral part 16. In the conversion mechanism 62, when a seal member 51 of the valve element 30 in the valve-closing direction abuts on the front edge 16a of the peripheral part 16, and the valve element 30 closes the communication opening 15, a seal member 51 abuts on the front edge 16a, and thereby the pressing force is increased. COPYRIGHT: (C)2009,JPO&INPIT |
