INTAKE SYSTEM OF INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To suppress the intake pulsation of an engine over wide speed range by providing multiple number of empty chamber on multiple number by branching pipe opening on an intake passage at the down stream of a throttle valve. CONSTITUTION:While this system may be applied to other types of an internal combustion engine which makes intermittent intake, specifically in the application for a pressurized crankcase type 2-cycle engine for example, branching pipes 44 and 46 respectively having empty chambers 40 and 42 of different volume are connected to an intake passage 24 connected to a carburetor 20 at the location between a throttle valve 36 and an intake valve 26. When the air-fuel mixture is sucked into a crankcase 28 the intake valve 26 is closed and the pressure increase occuring at the downstream of the throttle valve is released to the empty chambers 40 and 42 to stabilize the intake. The intake pulsation is suppressed over wide speed range as the empty chamber 40 having small volume mainly absorbs high frequency pulsation energy while the empty chamber 42 having large volume mainly absorbs low frequency energy.