Patent ID: 7874278
Filing Date: 2011-01-25
Classification: F02B,F02F,Y02T

Abstract:
1. An intake port of an internal combustion engine comprised of a helical part formed about an axis of an intake valve and an intake air inflow passage part extending tangentially from said helical part, said helical part being defined by a peripheral wall surface extending about the axis of the intake valve, a top wall surface, and a bottom end outlet opened and closed by the intake valve, said intake air inflow passage part being defined by a first side wall surface tangentially connected to the peripheral wall surface of the helical part, a second side wall surface extending toward a stem of the intake valve until the peripheral wall surface of the helical part, a top wall surface, and a bottom wall surface, wherein the bottom end outlet of said helical part is arranged at a peripheral portion of a combustion chamber top surface, the intake air inflow passage part is arranged so that said first side wall surface extends tangentially with respect to the peripheral portion of the combustion chamber, in a ring shaped intake valve opening formed between the intake valve and a seat of the intake valve when the intake valve is fully open, there is an intake valve opening region formed at an opposite side of the intake air inflow passage part with respect to a plane including a cylinder axis and a central portion of an intake valve body, a lower layer flow flowing through a lower part of the intake air inflow passage part and an upper layer flow flowing through an upper part of the intake air inflow passage part are generated in the intake air inflow passage part, said lower layer flow flows toward said intake valve opening region, then flows from the intake valve opening region to an inside of the combustion chamber toward the circumferential direction of the combustion chamber to generate a swirl in the combustion chamber when the intake valve is opened, and said upper layer flow whirls in the helical part and then flows, while diffusing, from the entirety of the intake valve opening into the combustion chamber when the intake valve is opened.