| 摘要 |
<p>An intake manifold M for a multiple-cylinder internal combustion engine has a collective part 10 defining an intake gas distribution chamber 11, and a branch intake part 20 having a plurality of branch intake passages 22. The collective part 10 is built by joining together a first section A and a second section B respectively defining a first space 11a and a second space 11b which form the intake gas distribution chamber 11. A first corner part 31a and a second corner part 31b are formed integrally with the first section A and the second section B, respectively. The second section B is provided with a guide wall 40 extending in both the first section A and the second section B so as to cover the respective inside surfaces 31a1 and 31b1 of the first corner part 31a and the second corner part 31b. The guide wall 40 has a guide surface 44 for guiding the intake gas more smoothly than the inside surface 31a1 and 31b1. Since the intake manifold M is a split structure built by joining together the first section A and the second section B, the intake gas can be made to flow smoothly in the intake gas distribution chamber regardless of the shape of the corner part, and the volumetric efficiency of the internal combustion engine is improved.</p> |
