FOUR-CYLINDER FOUR-STROKE INTERNAL COMBUSTION ENGINE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; multicylinder internal combustion engines. SUBSTANCE: invention relates to internal combustion engines with fuel injection into cylinders. Such engines can be used in automotive vehicles. Said multicylinder engine has cylinder head 1 with intake holes 2 in which intake valves 3 are fitted, intake branch pipes 4 connected to intake holes and getting into gas collecting receiver 5 whose side wall 6 is provided with connecting holes 7 for branch pipes 4. Union 9 partially perforated on its length is secured along space of receiver 5 on its end face wall 8. Outlet of union 9 is connected to air cleaning and fuel feed system 10 of engine, and by inlet is hermetically sealed opposite end face 11 of receiver. Solid cross partitions 12 are mounted inside receiver to divide it into separate chambers A-Б-B-Г, each communicating with inner space of union 9 by means of perforation holes 13 whose number is equal to number of connecting holes 7 for intake branch pipes 4. Natural frequency of first chamber A is equal to natural frequency of fourth chamber -Г-, and natural frequency of third chamber B is equal to natural frequency of second chamber -Б-. EFFECT: improved acoustic characteristics, reduced gas dynamic fluctuations in engine intake system. 9 cl, 3 dwg