AIR INTAKE STRUCTURE FOR INTERNAL COMBUSTION ENGINE

• Main Authors: NAKAMURA, Yohei, SHOMURA, Takaaki, CHO, Masaki
• Format: Patent
• Language: English; French; German
• Published: 10.05.2023
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

In an intake structure for an internal combustion engines in which an inlet pipe 6 is connected to an intake port 42, defining an intake passageway 80; a throttle body 7 having an intake channel 70, a throttle valve 71 and a tumble valve 72 therein are connected to an upstream side of the intake passageway 80, and the intake passageway 80 is divided by a partition plate 81 into an upper main passageway 80A and a lower auxiliary passageway 80B serving as a tumbling flow channel,wherein an idling air passageway 100 is defined in an upper side of the intake channel 70 to provide fluid communication between a region upstream of the throttle valve 71 and a region downstream of the throttle valve 71, the idling air passageway 100 has a downstream outlet 102 defined in an upper inner surface 70aa of the intake channel 70 between the throttle valve and the tumble valve, and when the throttle valve is fully closed,idling air flowing out of the idling air passageway 100 is restrained by a tumble valve plate 72b of the tumble valve from flowing into the upper main passageway and is guided from a recess 72c in the tumble valve plate to the lower auxiliary passageway 80B. It is thus easy to intensify a tumbling flow even when the internal combustion engine is operating in an idling mode, etc.