Patent ID: 8161951

Claim:
An internal combustion engine, comprising: a plurality of crank chambers; and a blow-by gas processing device configured to collect blow-by gas from the plurality of crank chambers, wherein the blow-by gas processing device comprises: an oil separator configured to separate an oil component contained in the blow-by gas, the oil separator comprising a blow-by gas inlet in a vicinity of an engine front or an engine rear; gas introducing chambers which are disposed between the crank chambers and the blow-by gas inlet; communicating holes, wherein each communicating hole connects one of the gas introducing chambers to a corresponding crank chamber, wherein the communicating holes comprise a specific communicating hole which is closest to the blow-by gas inlet relative to a rest of the communicating holes, wherein the gas introducing chambers comprise a specific gas introducing chamber connected to the specific communicating hole and an adjacent gas introducing chamber which is adjacent to the specific gas introducing chamber; and guiding members configured to guide the blow-by gas from the gas introducing chambers to the blow-by gas inlet, the guiding members comprising a member configured to guide the blow-by gas from the specific communicating hole to the adjacent gas introducing chamber via the specific gas introducing chamber in a direction heading away from the blow-by gas inlet, and a member configured to guide the blow-by gas from the adjacent gas introducing chamber to the blow-by gas inlet.