| 摘要 |
PROBLEM TO BE SOLVED: To make air in a crank chamber flow from a throttle valve upstream side of an intake pipe even at engine heavy load operation and prevent blow-by gas from reversely flowing to the throttle valve upstream side of the intake pipe. SOLUTION: This blow-by gas recirculation device is provided with a blow-by gas recirculation passage establishing communication between a throttle valve downstream side of the intake pipe 12 supplying combustion air to an engine and an inside of a crank chamber of the engine, and an air introduction passage 24 establishing communication between the throttle valve upstream side of the intake pipe 12 and the inside of the crank chamber. An upstream end part 30 of the air introduction passage 24 includes a projecting pipe body 32 projecting from an inner wall surface 12w of the intake pipe 12 in a flow path center direction of the intake pipe 12, and an air flow inlet 34 opening at a tip of the projection pipe body 12. The air flow inlet 34 opens right in front of an air flow direction. COPYRIGHT: (C)2007,JPO&INPIT
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