INTERNAL COMBUSTION ENGINE INTAKE SYSTEM Russian patent published in 1998 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: system has air cleaner 1, warm air branch pipe 2, cold air branch pipe 3, temperature regulator 4, warm and cold air flow ratio control gate 5 and mixed air pipe 6. Warm air branch pipe 2 is made in form of flexible hose with wall impermeable to gas. Branch pipe has spacer 9 arranged at a distance of 0.35-0.4 of total length of branch pipe 2 form its open end 7. Spacer 9 is made in form of solid bushing manufactured of porous material permeable to gas and noise damping and is used as device to suppress acoustic resonances and low frequency pulsations of air in intake system of automobile engine. EFFECT: reduced noise level in passenger cars. 2 cl, 3 dwg