Two-stroke internal combustion (IC) engine for use in e.g. hand-held power tool, has air duct, which is connected to air intake on cylinder and to crankcase via separator for cleaning air from lubricating oil and fuel from crankcase

摘要

An air duct (8) is connected to an air intake (7) in a cylinder (4) and to a crankcase (2) via separator (10). The separator includes a centrifugal chamber (11), which cleans air from lubricating oil and fuel from the crankcase by circulating motion. The separated lubricating oil and fuel are thrown into a circumferential wall (12), while the cleaned air passes through a chamber outlet (13), which serves as a radially inner outlet to the air duct. The cleaned air flows into the combustion chamber (6) via cylinder.