| 摘要 |
PROBLEM TO BE SOLVED: To suppress an increase in the passage resistance of an intake passage and reduce manufacturing cost by a waterproof structure for suppressing the intrusion of water drips into a negative pressure outlet formed in an intake device, miniaturize a recess and simplify the structure, and avoid damage of the projection formed on the passage wall when the passage wall is handled. SOLUTION: The intake passage is formed by joining the upper and lower cases 10, 20 of an intake manifold to each other. The lower case 10 has the recess 50 in the inner surface 17a. The recess 50 has a bottom surface 53 in which the negative pressure outlet 42 is opened. An opening hole 51 opened upward is formed in the upper part of the recess 50. The upper case 20 has the projection 60 extending downward from the joint surfaces 10a, 20a toward the negative pressure outlet 42 and projecting into the recess 50 through the opening 52. The projection 60 is positioned between the negative pressure outlet 42 and the internal surface 17 in the horizontal direction A1 on the upper side of the negative pressure outlet 42. The lower end 63 of the projection 60 is arcuate so that the center part 65 in the horizontal direction A2 is recessed downward. COPYRIGHT: (C)2009,JPO&INPIT
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