Patent ID: 8210153
Filing Date: 2012-07-03
Classification: F02D

Abstract:
1. An intake manifold, comprising: a manifold case having an intake passage; and a valve arranged in the intake passage, the valve having a distal end, a proximal end, and side edges, wherein the valve is rotatable about the proximal end so as to partly close the intake passage, wherein when the valve partly closes the intake passage, a clearance is formed between a wall surface of the intake passage and the distal end of the valve, the clearance connecting a section of the intake passage upstream of the valve and a section of the intake passage downstream of the valve to each other, wherein when the valve partly closes the intake passage, each side edge of the valve comes in surface-to-surface contact with a stepped portion of the intake passage wall surface that faces each side edge of the valve, the stepped portion being provided in each portion of the intake passage wall surface that faces each side edge of the valve, the stepped portion extending along the intake passage along an entire height of each side edge of the valve, and wherein when each side edge of the valve contacts each stepped portion, spaces between the side edges of the valve and the corresponding wall surfaces of the intake passage are airtightly sealed.