| 摘要 |
PURPOSE:To effectively promote the atomization of fuel while to prevent an intake amount of air from its decrease, by providing almost ring-shaped protrusive streak parts, in which one part of the peripheral part corresponding to the branch direction of a branch port is divided by a space, in a branch part upstream internal peripheral wall of the branch port. CONSTITUTION:Fuel in an intake manifold exists mixing with atomized fuel, floating in a pipe, in a wall flow adhering to a pipe internal wall. And, for instance, the wall flow, transmitted along a surface corresponding to a direction crossing at a right angle with the branch direction of branch ports 4, 5 in the pipe, hits respectively corresponding protrusive streak parts 12a, 12b. As the result, the wall flow is separated into a part, in which the fuel is atomized by an air stream in point ends of the protrusive streak parts 12a, 12b, and a part, in which the fuel, being guided by the protrusive streak parts 12a, 12b and to their space part 13, is introduced to a branch part 8 moving along the pipe internal wall from the space part 13 being left as in a state of the wall flow by the air stream. Accordingly, the intake manifold enables the uniform wall flow to be supplied to each port while the atomization of the fuel to be effectively promoted.
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