AIR COOLED ENGINE AND ENGINE-POWERED WORK TOOL

摘要

An air-cooled engine includes a cylinder provided with a plurality of cooling fins at an outer peripheral surface of the cylinder, a cooling fan, a cylinder cover covering the cylinder, an air guide plate, and an air guide portion. The air guide plate is positioned between an inner surface of the cylinder cover and the fins. The cooling fan generates cooling air stream for cooling the cylinder, and the air guide plate is configured to guide the cooling air stream to flow through a space between the inner surface of the cylinder cover and the fins. A first small space is defined between the air guide plate and the inner surface of the cylinder cover. The air guide portion covers at least a part of the first small space at an upstream side of the air guide plate in the axial direction of the drive shaft.

主权项

1. An air-cooled engine comprising:
an engine body provided with a cylinder having a cylinder portion and a plurality of cooling fins provided at an outer peripheral surface of the cylinder portion, and a drive shaft provided with a cooling fan, the drive shaft defining an axis extending in an axial direction; a cylinder cover covering the cylinder; an air guide plate provided at an internal space of the cylinder cover and between an inner surface of the cylinder cover and the plurality of fins, the cooling fan being configured to generate cooling air stream within the cylinder cover for cooling the cylinder, and the air guide plate being configured to guide the cooling air stream to flow through a space between the inner surface of the cylinder cover and the plurality of fins, a first small space being defined between the air guide plate and the inner surface of the cylinder cover; and an air guide portion provided in the internal space of the cylinder cover and configured to cover at least a part of the first small space at an upstream side of the air guide plate in the axial direction of the drive shaft.