METHOD OF SILENCING EXHAUST NOISE OF COMBUSTION PRODUCTS OF INTERNAL COMBUSTION ENGINE AND ENGINE FOR IMPLEMENTING THE METHOD Russian patent published in 2006 - IPC F01N1/00 F02B27/04 

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: proposed method of exhaust noise silencing with division of cycle portion into flows with subsequent discharge into atmosphere and ejecting of remnants of products from cylinder comes to the following: prior to opening of exhaust port by piston. Pressure of combustion products on cylinder is reduced by bypassing part of products from cylinder into bypass space by two synchronous flows. For this purpose first, part of combustion products is let out through hole opposite to exhaust port arranged at beginning of pre-exhaust sector-sector of mainly cross displacement of crankshaft journal and slowing down of axial displacement of piston to BDC, said part is divided into two semiflows into which jets of combustion products from following holes of pre-exhaust are fed in pairs in succession, and these semiflows are connected after exhaust port in flange of exhaust pipeline, and combustion products remaining in cylinder are fed into common flow after opening of exhaust port by piston. Two-stroke internal combustion engine consists of at least one cylinder with liner and piston moving in liner, piston being mechanically coupled with crankshaft, means for preparing working mixture and delivering it into cylinder, ignition and discharge of combustion products with means of scavenging, for instance, loop scavenging. Bypass space connected with exhaust port and flange of exhaust port and flange of exhaust pipeline is made on outer surface of cylinder over level of exhaust port. Cylinder and linear are provided with system of pre-exhaust holes communicating with space with at least one means for dividing combustion products bypassed into bypass space. Area of exhaust port is reduced by summary area of pre-exhaust holes owing to reduction of height of exhaust port.

EFFECT: improved exhaust noise silencing.