Patent ID: 8336529

Claim:
A vapor-liquid separating structure for an engine comprising: an inlet section configured and arranged to take in blow-by gas from inside a valve mechanism chamber; a discharging section configured and arranged to discharge the blow-by gas taken in through the inlet section; a vapor-liquid separating section including an intermediate flow passage section connecting the inlet section and the discharging section together, and configured and arranged to execute a vapor-liquid separation treatment with respect to the blow-by gas while guiding the blow-by gas taken in through the inlet section to the discharging section along the intermediate flow passage section; and a collecting section arranged outside of the intermediate flow passage section, and configured and arranged to accumulate a majority of oil entered into the vapor-liquid separating structure through the inlet section, the collecting section being arranged on an opposite side from the intermediate flow passage section with respect to the inlet section as viewed in a top plan view of the engine and having a structure that is closed except for a portion connecting to the inlet section.