Engine and engine-operated working machine

摘要

In an engine including a cooling fan provided at one end of a drive shaft to cool the engine, a muffler is attached such that a longitudinal direction thereof coincide with a direction of gravity, and a muffler accommodating chamber is formed by a muffler cover. A portion of cooling air generated by the cooling fan is introduced into the muffler accommodating chamber so as to cool the muffler. At the muffler accommodating chamber, a cooling air outlet is provided at an upper end of a cooling passage, such that the waste heat of the muffler is discharged from the cooling air outlet to the outside during the stop of the engine. A cooling air inlet is disposed below the cooling air outlet such that the cooling air flows from the lower side to the upper side of the muffler.

主权项

1. An engine comprising:
a cylinder having a plurality of fins at an outer circumference thereof and forming a combustion chamber; a cooling fan, which is provided at one end of a drive shaft, and which is configured to cool the cylinder; a muffler attached to an exhaust port of the cylinder; and a muffler cover, which covers the muffler, and which forms a muffler accommodating chamber, wherein the muffler cover comprises a cooling air inlet and a cooling air outlet, and a part of cooling air generated by the cooling fan is introduced from the cooling air inlet into the muffler accommodating chamber so as to cool the muffler, wherein: the engine comprises a heat shield plate interposed between the muffler and the muffler cover; and the heat shield plate is provided with a top wall portion that extends between a top wall portion of the muffler and a top wall portion of the muffler cover, and configured to allow the cooling air from the cooling air inlet to flow between the muffler and the heat shield plate.