| 摘要 |
Air is aspirated by cylinders of cylinder rows ( 11, 12 ) via branch pipes ( 23,24 ) from two intake collectors ( 21,22 ) of a V type multi-cylinder internal combustion engine. An auxiliary chamber ( 31, 32 ) is formed using the space between adjacent branch pipes ( 23,24 ). A communication port ( 25, 26 ) to the intake collector ( 21,22 ) of the auxiliary chamber ( 31,32 ) is formed between the openings ( 23 A, 24 A) to the intake collector ( 21,22 ) of two adjacent branch pipes ( 23,24 ). Since the effective volume of the intake collector ( 21,22 ) increases due to the auxiliary chamber ( 31,32 ), residual resonance in the intake collector ( 21, 22 ) decreases. The auxiliary chamber ( 31,32 ) increases an intake inertia effect by increasing the flow rate of the branch pipes ( 23,24 ) in the second half of the intake stroke relative to the flow rate in the first half of the intake stroke. Engine volume efficiency is thereby improved using a limited space.
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