INTAKE DEVICE FOR MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To inhibit enlargement and weight increase of an intake device provided with a negative pressure chamber and efficiently accumulate negative pressure while enabling increase of volume of the negative pressure chamber in which intake negative pressure is accumulated in an intake device for a multi-cylinder internal combustion engine. SOLUTION: A plurality of intake air branch passages 50 for an intake device 10 includes inlets 50i opening to an expansion chamber 32 of an intake air collecting chamber 30 and arranged in a row in an arrangement direction. A collecting chamber wall 21 forming an intake air collecting chamber 30 includes a first and a second end wall 24, 25 opposing in a first direction A1. An upstream end pipe wall 43 forming the inlets 50i projects toward the second side wall 25 from the first side wall 24 in the first direction A1. A communication port 68a of a communication passage 68 communicating to a resonator chamber 62 is positioned closer to the first side wall 24 than the inlets 50i in the first direction A1. Intake air flowing in from the intake air introduction passage 31 flows into the inlets 50i after flowing in the arrangement direction A0 at a section closer to the second side wall 25 than the inlets 50i in the first direction A1 in the expansion chamber 32. COPYRIGHT: (C)2010,JPO&INPIT