Patent ID: 9657697
Date: 2017-05-23
CPC Classifications: F02M,Y02T

Claim:
1. An intake duct configured to be connected to an intake port of a cylinder head, the intake duct comprising: a partition disposed within the intake duct that extends in a direction of intake air flow and that partitions the intake duct into a passage and an auxiliary passage, the partition having a terminal in an upstream direction of intake air flow of the main passage and the auxiliary passage; and a valve disposed within the intake duct that opens and closes the main passage, wherein a restrictor that minimizes a cross-sectional area of the auxiliary passage is provided between an upstream end and a downstream end in the direction of intake air flow of the auxiliary passage, the cross-sectional area of the auxiliary passage increases from the restrictor toward the downstream end, and the valve is configured to close the main passage by contact with the terminal end of the partition.