| 摘要 |
PURPOSE:To prevent a wall flow f fuel from being formed in the internal wall of an intake pipe, by providing both a Laval nozzle, which generates a high speed intake flow in a primary passage, and an ultrasonic vibrating means in the vicinity of the opening part of an outlet side passage part in the primary passage. CONSTITUTION:An engine equips a throttle body 11 with a secondary passage 12 while provides a chamber 13, positioned in the vicinity of a connection part with an intake pipe collective part 9 and partitioning vaporization space 14, in the direction almost at a right angle. The engine, opening an outlet part 16 of a primary passage 15 to the base end part center of said chamber 13, forms a Laval nozzle 17 in said outlet part 16 while provides a fuel supply nozzle 18 in the upstream side of the nozzle 17. While the engine, providing an annular vibrator 37 in front of the outlet part 16, providing an annular vibrator 37 in front of the outlet part 16, provides the vibrator to be lined through a supporting strut 39 with an ultrasonic vibrator 38 mounted to the chamber 13. And the engine provides throttle valve 22, 23 with mutually different opening proportion in accordance with a load, in each passage 12, 15 while interposes a pressure control valve 24 in the upstream side of the throttle valve 22 in the secondary passage 12.
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