| 摘要 |
<p>An intake manifold M for a multiple-cylinder internal combustion engine has a collective part 10 forming an intake gas distribution chamber 11, and a branch part 20 forming branch intake passages 22. The collective part 10 is built by joining together a first section A defining a first space 11a, and a second section B defining a second space 11a. The first space 11a and the second space 11b form the intake gas distribution chamber 11. The first section A and the second section B have corner parts 31a and 31b, respectively. The second section B is provided with a guide wall 40 extending in the first section A and the second section B so as to cover the respective inside surfaces 31a1 and 31b1 of the corner parts 31a and 21b. The guide wall 40 has a guide surface 44 capable of smoothly guiding an intake gas as compared with the inside surfaces 31a1 and 31b1 of the corner parts 31a and 31b. The guide wall 40 and the corner parts 21a and 31b define a back space 47 communicating with the intake gas distribution chamber 11. The intake gas can flow smoothly in the intake gas distribution chamber of the intake manifold of the split construction regardless of the shape of the corner part of the collective part. Consequently, volumetric efficiency can be improved. The variation of pressure in the intake gas distribution chamber can be suppressed by using the back space behind the guide wall.</p> |
